Category Archives: Wastewater Treatment Plant Servicing and Maintenance

KEE EXPERIENCE IN IRELAND

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KEE Wastewater Treatment and Disposal

KEE are a major supplier of process engineered treatment systems and have been heavily involved with Water Services and Local Councils in Ireland for supply and upgrade of wastewater treatment facilities.  The applications vary from simple Municipal wastewater treatment plants providing basic treatment to supplying plants which are designed to produce very high quality effluent with phosphorus and total nitrogen reduction.  In many cases the requirements are for less than 3 mg/l of ammoniacal nitrogen associated with less than 5mg/l BOD and Suspended Solids.

Having been involved with supplying many Municipal wastewater treatment plants in Northern Ireland for sites at Kinallen, Fivemiletown, Bergah, Ballinamallard, Fintona, Lisbellaw, Caledon, Lislea and many more, KEE are also working with Councils in Eire to upgrade treatment plants to facilitate discharge of highly polluted industrial effluent into their system.

Municipal wastewater treatment plants are able to accommodate and treat industrial discharges if these are taken into account at the design stage.  However, when the industrial discharge is intermittent and imposes sudden shock loads onto an otherwise overloaded Municipal facility, KEE have been able to offer solutions to overcome such  problems.  This includes upgrading the Municipal facility without much upheaval and also offering partial treatment of the industrial discharge at source to overcome the problems.  This is particularly the case with Municipal facilities which become oxygen limited in the activated sludge stage.  The solution is to install their versatile dual mode TRITON® processor which provides mixing and/or dissolved oxygen into the mixed liquor.  It is also possible to use the KEE DISPERSED AIR FLOATATION (DAF) MICROFLOAT® SYSTEM to provide partial on-site treatment to the industrial discharge to reduce the load discharged into the sewer.  KEE have used TRITON® Aerator to upgrade an overloaded Municipal plant in Scotland to accommodate loads generated from Distillery and are in the process of upgrading a Dairy Plant to upgrade the aeration system using TRITON® Aerator and to include biological phosphorus removal and reduce fat and grease by installing the KEE DAF system upstream of the biological process. “The polluter pays” and it therefore follows that those Industries which discharge large quantities of heavily polluted wastewaters into the sewer should consider the options of on-site treatment to reduce their costs and the loads on the Municipal treatment facilities.  The treatment options which should be considered are Physical, Physical/chemical or biological treatment or a combination of all or any of these.

KEE-microfloat-01  KEE-microfloat-03              KEE MICROFLOAT® SYSTEM

Triton   kee_triton      KEE TRITON® AERATION/MIXING

KEE have built many facilities in Ireland to include phosphorus and total nitrogen removal with simplicity of process design and operation thus embracing the KEE philosophy of offering low lifetime cost solutions.

The KEE Group of Companies, can offer such an option.  Their technologies include physio-chemical processes (Dispersed Air Floatation, simple gravity solids and grease separators), Anaerobic Reactors (for high strength wastewaters), Fixed Film Reactors (RBC & SAF) and Suspended Growth Reactors (activated sludge processes -Extended Aeration, Oxidation Ditch, SBR, Extended Aeration followed by Ultra Fine Filtration), and on-site operation of the treatment plant.  KEE also have a team of experienced process engineers and project engineers capable of delivering the necessary turnkey solution to suit most customers.

oxidation_ditch  NuSAF-01
OXIDATION DITCH                                            KEE ENVIROSAF

Okee-rbcs                                 KEE ROTATING BIOLOGICAL CONTACTORS (RBC)

To see the capabilities of the KEE Group of companies please visit the KEE Group website

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KEE is a globally recognised brand operating within in the industrial, commercial and domestic wastewater treatment industries. KEE’s specialist knowledge and expertise is derived from over 60 years’ experience in the design, development, manufacture, install, commissioning, operation, refurbishment, repair and maintenance of wastewater treatment systems and equipment, including:

  • Fixed Film Reactors: Rotating Biological Contactors (RBCs), Packaged RBC Systems, Moving Bed Biological Reactors (MBBR) and Submerged Aerated Filters (SAF).
  • Suspended Growth Reactors: Extended Aeration, Sequencing Batch Reactor (SBR), Oxidation Ditch, IFAS process technologies and Anaerobic Biological Reactor (ABR) for high strength industrial waste.
  • ‘Turn Key’ Solutions: Technical Design, Project Appraisal & Management, Process Engineering, Plant Installation & Operation, Equipment Refurbishment & Upgrades and Plant Rental. KEE also provide approved spares and ancillary products such as Final Clarifiers and Settlement Tanks.

KEE Services Ltd specialise in maintenance & repair services for all makes and types of wastewater treatment systems & pumping stations. Our nationwide team of directly employed, regional engineers and technicians are KEE trained, DBS checked and British Water Certified.

 

KEE NuTech TERTIARY FILTERS

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Biological Tertiary Filter Units for BOD, Suspended Solids, Ammoniacal and or Total Nitrogen reduction.

1.4 RENDER-modified

KEE have introduced a new range of tertiary filter units to their wastewater technology called KEE NuTech Tertiary Filters.

The new range of KEE NuTech Tertiary Filter units are a multistage biological – physical system and operates with minimal maintenance and does not require electrical power for its operation, except for specific circumstances. The tertiary filter polishes the final effluent from the final settlement stage of a treatment plant and the polished effluent can be discharged through a UV light disinfection system to make it suitable for irrigation use.

The media is contained in easy to handle bags and these bags are arranged to optimise the breakdown of the organic components of wastewater by alternating aerobic and anoxic stages.  The aerobic layers of media are aerated through natural ventilation using ventilation stacks and vent pipes or can be low pressure, low power, fan assisted through forced ventilation.

The bio-degradation capability of the tertiary filter eliminates the need to backwash the filter on a regular basis.  The tertiary filter media therefore provides the physical separation of the fine solids and the environment for the natural bio-degradation of these retained solids.

Tertiary Brochure (2nd Stage 1pp).indd

Tertiary Filter Options The KEE NuTech Tertiary filters are available as free standing units or as an integral part of a KEE Packaged Plant.

NuDisc Tertiary Filter system

KEE NuDisc® HR-R Packaged WwT Plant is a simple low energy, low maintenance system, offering the lowest lifetime cost compared to most similar packaged plants for high quality effluent in the market. The treated effluent can be recycled for irrigation, general outdoor washing, toilet flushing or similar non-potable use.

To see the capabilities of the KEE Group of companies please visit the KEE Group website

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KEE is a globally recognised brand operating within in the industrial, commercial and domestic wastewater treatment industries. KEE’s specialist knowledge and expertise is derived from over 60 years’ experience in the design, development, manufacture, install, commissioning, operation, refurbishment, repair and maintenance of wastewater treatment systems and equipment, including:

  • Fixed Film Reactors: Rotating Biological Contactors (RBCs), Packaged RBC Systems, Moving Bed Biological Reactors (MBBR) and Submerged Aerated Filters (SAF).
  • Suspended Growth Reactors: Extended Aeration, Sequencing Batch Reactor (SBR), Oxidation Ditch, IFAS process technologies and Anaerobic Biological Reactor (ABR) for high strength industrial waste.
  • ‘Turn Key’ Solutions: Technical Design, Project Appraisal & Management, Process Engineering, Plant Installation & Operation, Equipment Refurbishment & Upgrades and Plant Rental. KEE also provide approved spares and ancillary products such as Final Clarifiers and Settlement Tanks.

KEE Services Ltd specialise in maintenance & repair services for all makes and types of wastewater treatment systems & pumping stations. Our nationwide team of directly employed, regional engineers and technicians are KEE trained, DBS checked and British Water Certified.

 

KEE EnviroSAF – FINE BUBBLE AERATION with easy access membrane diffusers, meaning no treatment down-time.

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KEE offer another revolutionary fixed film technology using compressed air. Traditionally, SAF systems with structured media have been offered with fine bubble membrane diffusers, with the drawback that access to diffusers was difficult. Until now it has been necessary to remove media and empty the reactor tank of wastewater to access the fine bubble membrane diffusers.

KEE have patented new technology, making it possible to access the fine bubble membrane diffusers without the need of emptying the SAF tank, or removal of the media. Whilst one set of fine bubble membrane diffusers is being maintained the rest of the SAF plant can continue to function and treat the wastewater. This negates the need to empty or hire a temporary plant while maintenance is being carried out.

NuSAF-01

Cut-away view of the KEE EnviroSAF

KEE have installed 2500 PE SAF Systems in Scandinavia using this new EnviroSAF technology and also have built plants for UK Water plc..

The KEE EnviroSAF uses patented structured media which has a profile in its shape to induce velocity and pressure gradients in the air/water mixture flowing through the media. This concept enhances mixing and is responsible for keeping the biomass film on the media active and aerobic. KEE have offered SAF Systems for many years and have built100’s of containerised mobile plants for Work and Army Camps, where the systems were designed to be above ground as they needed to be mobile. Access to diffusers was therefore easy.

KEE have also installed SAF Systems in Northern Ireland where the final effluent quality achieved is extremely high, with BOD less than 4mg/litre, ammoniacal nitrogen less than 2mg/litre, phosphorus less than 4mg/litre and suspended solids less than 10mg/litre. The EnviroSAF technology offers all the process stability of fixed film reactors, but with the added advantage of using fine bubble diffused air, patented structured PVC media and the ease of access for maintenance of diffusers without the need to remove the media and emptying the EnviroSAF tank.

The KEE Group of Companies is committed to providing a customised approach to domestic, commercial and industrial wastewater treatment applications. With over 60 years’ experience in the development, design and manufacture of equipment, KEE has installed more than 350,000 solutions worldwide.

To see the capabilities of the KEE Group of companies please visit the KEE Group website

KEE Process Logo

KEE is a globally recognised brand operating within in the industrial, commercial and domestic wastewater treatment industries. KEE’s specialist knowledge and expertise is derived from over 60 years’ experience in the design, development, manufacture, install, commissioning, operation, refurbishment, repair and maintenance of wastewater treatment systems and equipment, including:

  • Fixed Film Reactors: Rotating Biological Contactors (RBCs), Packaged RBC Systems, Moving Bed Biological Reactors (MBBR) and Submerged Aerated Filters (SAF).
  • Suspended Growth Reactors: Extended Aeration, Sequencing Batch Reactor (SBR), Oxidation Ditch, IFAS process technologies and Anaerobic Biological Reactor (ABR) for high strength industrial waste.
  • ‘Turn Key’ Solutions: Technical Design, Project Appraisal & Management, Process Engineering, Plant Installation & Operation, Equipment Refurbishment & Upgrades and Plant Rental. KEE also provide approved spares and ancillary products such as Final Clarifiers and Settlement Tanks.

KEE Services Ltd specialise in maintenance & repair services for all makes and types of wastewater treatment systems & pumping stations. Our nationwide team of directly employed, regional engineers and technicians are KEE trained, DBS checked and British Water Certified.

 

KEE MICROFLOAT DISPERSED AIR FLOTATION TECHNOLOGY REDUCES POLLUTION

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KEE continually introduce improvements to effluent treatment technology in a bid to minimise environmental pollution from wastewater.

Many industrial processes, particularly food processing, drinks/brewery and dairy, generate a large volume of effluent that is discharged into the sewer. The raw wastewater has high biological oxygen demand (BOD), high chemical oxygen demand (COD) and Fat, Oil and Grease (FOG).  To reduce environmental pollution, companies often pre-treat the wastewater before the wastewater is discharged into the sewer.

KEE-microfloat-01

Cut-away view of the KEE Microfloat Dispersed Air Flotation Technology.

KEE-microfloat-02

Process diagram of the KEE Microfloat technology.

KEE-microfloat-03

This food processing plant reduced surcharges with the KEE Microfloat.

Until now, a system known as Dissolved Air Flotation (DAF) has been used to do this.  The conventional DAF system uses a high-pressure pump, venturi system and pressure vessel to dissolve air into the wastewater. The solution of air and water is stabilised in a pressure vessel under high pressure. A stream from the pressure vessel is discharged into a separating vessel where the air comes out of solution and is released as a fine bubble spray. These bubbles greatly reduce the pollutants by floating them to the surface where they are removed by equipment designed to remove the floating layer.

The KEE Microfloat system achieves the same result without the need to use a high-pressure pump and venturi. Instead, it incorporates a patented system from Aeration Industries that uses a low-power motor. A specially designed propeller disc on the aerator’s shaft produces extremely fine bubbles and transfers these 10-50μm air bubbles into the water through special ejectors.

The whole system is mounted in the circular flotation tank or could be mounted in a rectangular tank be retro-fitted into an existing DAF system.

Some major advantages of the KEE Microfloat system are that it:

  • Removes in excess of 90% of fats, oils and grease (FOG).
  • Substantially reduces the BOD and COD of the effluent.
  • Eliminates the need for fine screens either before or after fat traps.

The KEE Group of Companies is committed to providing a customised approach to domestic, commercial and industrial wastewater treatment applications. With over 60 years’ experience in the development, design and manufacture of equipment, KEE has installed more than 350,000 solutions worldwide.

To see the capabilities of the KEE Group of companies please visit the KEE Group website

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KEE NuDisc ® and KEE NuDisc-R ® – THE VERSATILE PACKAGED TREATMENT SYSTEM

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The KEE NuDisc® Single Piece Packaged Plant and the NEW NuDisc-R®  – is an innovative and a truly versatile systems for the effective treatment of wastewater, including Nutrient removal. A new optional feature has been built into the NuDisc Single Packaged Plant to create the NEW KEE NuDisc-R® Packaged Plant System – physical-biological tertiary treatment with water recycling.

Flexible solutions have long been at the heart of our philosophy and we are now pleased to be able to offer one solution to meet every need. Despite being able to handle a variety of flow rates and numerous final effluent types, the KEE NuDisc® technology combines features that actually simplify its operation and maintenance without compromising the results.

From the moment the KEE NuDisc® is installed, low operating and powercost with long design life ensures low life time cost. The KEE NuDisc® provides the assurance that wastewater is being properly handled and the risk of pollution in the local environment is minimised. KEE can provide a fixed price maintenance package to cover for all mechanical and electrical items and the labour costs after the initial warranty periods.

KEE-NuDisc-1600

KEE NuDisc®

RBC Single Piece Packaged Wastewater Treatment System

KEE Process Ltd has always been a leader in innovative technology for wastewater treatment. The company offers the versatile NuDisc® Single Piece Packaged Plant for the treatment of wastewater. It can be applied to achieve any one or a combination of requirements, including BOD5 reduction, nitrification, total nitrogen reduction or phosphorous removal. Built on KEE’s own proven technology introduced over 60 years ago, the NuDisc® brings many advanced features specifically aimed at simplifying the operation and maintenance of the plant. Its design provides a structural GRP Tank and internal components designed for a life in excess of 30 years. The mechanical components are selected for 100,000 hours L10 life. The end result is a plant with extremely low lifetime costs.

The KEE NuDisc® uses the well-proven principle of attached growth rotating biological contactors (RBC), which support an active film (biomass) for biological treatment of the wastewater. The RBC stage is divided into two specific zones, the first acting as an anoxic reactor and the second as an aerobic reactor. The whole system, including the primary settlement tank, the RBC and the final settlement tank, are housed in a single GRP tank and arranged in such a way that flow attenuation becomes an integral part of every plant.

At the first stage of the treatment process, the wastewater enters the primary settlement tank. Here the solids are settled out and retained as sludge, which is drawn off periodically for disposal. The partially clarified liquor is then brought in contact with the anoxic stage of the RBC reactor where partial degradation of BOD and de-nitrification take place. The biomass in the anoxic stage also provides biological attenuation of organic pollutants, which are partially treated and degraded into much more readily treatable substrates for the aerobic RBC stage.

The downstream aerobic RBC stage is operated under plug flow conditions where BOD removal and nitrification take place. The KEE NuDisc® technology can be applied to different applications to achieve the desired final effluent quality. For instance, where phosphorous removal is required this is achieved by coagulating phosphorous out of the treated effluent at the end of the RBC stage.

The final clarifier is benched at the bottom to facilitate the consolidation of sludge which is then returned to the primary clarifier through the pump assisted hydrostatic sludge return system. In applications requiring de-nitrification, this is achieved by further treating the nitrified effluent in the anoxic zone of the treatment system.

KEE NuDisc® - R

Built-in Optional Tertiary Treatment

The treated effluent from the final clarifier can be discharged to a watercourse or, as an option, this can be further treated to a much higher quality in a physical-biological tertiary stage. This physical-biological filter includes media with extremely large surface area to volume ratio and is arranged in the unit to work as alternating aerobic and anoxic zones for the most effective breakdown of the residual organic constituents (hard BOD) of the treated wastewater from the first and second zone RBC process. The tertiary filter stage is fitted with natural wind turbine or electric fan assisted aeration zones for creating the alternating aerobic-anoxic stages in the filter. The tertiary stage media structure is such that the effluent undergoes breakdown of the remaining soluble organic material and the fine solids contained in the wastewater. The fine organic solids are captured and retained in the media for breakdown.

Nudisc-Illus-HiRes

Effluent Disinfection:

The treated effluent from the compact KEE NuDisc® or KEE NuDisc®-R can be disinfected using packaged UV light disinfection system before discharge. The disinfected effluent can be either discharged to a watercourse or recycled for irrigation or other applications such as toilet flushing or non-portable use.

The KEE NuDisc® is offered for flows from 1m³/day through to 70m³/day and the KEE NuDisc®-R is offered for flows from 1m³/day through to 40m³/day and is normally packaged into a single piece structure with low profile aesthetically acceptable sectional GRP covers. They incorporate hatches that allow easy desludging and access to mechanical components for regular maintenance. This same KEE NuDisc® and KEE NuDisc®-R technology are also available as Modular RBC Systems, where the individual unit process operations are separated to provide greater flexibility in design, whilst retaining the essential design features such as Managed Flow and flow/load attenuation.

For additional information on NuDisc technology please visit the KEE website

 

 

 

NEW SERVICING REGULATIONS have been introduced for small sewage treatment plants and septic tanks.

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KEE offer Maintenances Plans to that ensure that your sewage treatment plants and septic tanks are compliant.

The Environmental Agency in January 2015, introduced a new code of practice making you as a home or business owner fully responsible for the maintenance of your wastewater system. If you have a small sewage plant or a septic tank, by law you must ensure that your system is maintained properly and does not cause pollution.  It must comply with the ‘general binding rules’.  https://www.gov.uk/permits-you-need-for-septic-tanks.

Protect your local environment by following the rules.

Comply with the general binding rules, just follow our recommended steps below:

  • Get expert, specialist advice, call in a KEE Services engineer for an appraisal; your wastewater treatment systems should be serviced regularly and properly maintained. If it isn’t it can be a serious health hazard and pollute the local environment. Your sewage treatment system must be ‘fit-for-purpose’ and comply with industry standard EN 12566.
  • You are also at risk of prosecution if the regulations are not upheld.
  • You are limited to discharge a maximum of 2,000 litres of treated sewage per day into the ground or 5000 litres of treated sewage per day to flowing water.

If you discharge more you will need a permit.

Regularly maintaining your treatment system properly will help prevent pollution, avoid costly repair bills and minimise your energy consumption:

  • Get the sludge emptied regularly
    http://www.keeservices.com/kee-tankering.html.
  • Get it serviced using a KEE engineer and fix any problems immediately
    http://www.keeservices.com/planned-maintenance.html.
  • Regularly check your system for any signs of pollution such as sewage smells, pools of water, sludge, foam etc. If you notice any of these issues please contact KEE to arrange a service visit.  http://www.keeservices.com/book-a-service.html.
  • Don’t flush sanitary items, nappies, ‘flushable’ wipes or similar objects down the toilet as they can block the system.
  • Don’t push fats, oils or chemicals down the drain as they kill bacteria that break-down the waste. KEE offer a biological solution to solve this problem:
    http://www.keebioguard.com/index.html.
  • Use low or no phosphate detergents, which are kinder to the environment.
  • Keep maintenance records to know when to service and empty your system.

Call KEE today on 01296 634500 for advice on a maintenance plan that ensures your system is compliant or visit:  http://www.sewage-plant-maintenance.co.uk  and arrange a call-out.

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KEE Do’s & Don’ts to extend the life of a sewage treatment plant and prevent costly maintenance costs.

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Caring for Your Sewage Treatment Plant

Regular inspections and maintenance will help ensure your plant is operating at optimum performance and will maximise the lifespan of your equipment.

Do’s

  • Follow manufacturers’ recommended doses for your water type when using household cleaning products. Soft water requires far less detergent concentration than hard water.
  • Try to use cleaning products little and often so your treatment plant is not overloaded.
  • Use liquids (not powders) in washing machines and dishwashers. Powders re-coagulate into clumps and can cause blockages.
  • Try to spread your clothes washing throughout the week.
  • Stick to the same washing, dishwasher and other cleaning products as the bacteria will work more efficiently with products it is used to treating.
  • Think before you put anything down the sink, toilet or drains.
  • Desludge your plant when required. Click HERE to view our one page KEE EXPERT guide on proficient desludging and how regularly your unit should be desludged.
  • Ensure only toilet paper is flushed down the toilet and used in normal quantities.
  • Leave your plant switched on while you are away or on holiday. Switching off your plant can cause damage to the motor and moving parts as well as kill the biomass.
  • Compost all your organic food waste or use your local council bio-degradable waste recycling service (where applicable) to dispose of organic waste. Do not flush organic waste down the sink or drain.

Don’ts

  • Don’t put sanitary towels, tampons, cotton wool or cotton wool buds, incontinence pads or any baby, cleaning or facial wipes down the toilet.
  • Don’t flush rubber products or other non-biodegradable  products down the toilet.
  • Don’t pour fat, grease or cooking oil down the sink or drains. Fats suffocate the bacteria and inhibit the biological process. Everyday products such as milk, wine or beer increase the organic load and should also not be disposed of through the wastewater system.
  • Don’t use neat disinfectant or bleach. KEE recommends that these products are only used at the minimum concentration possible, as they can restrict the biomass growth within the plant.
  • Don’t tip medicine, mouth wash or any chemicals such as photographic fluid or garden products (e.g. Insecticides, weed killers and fungicides) down the drains as they will damage the biological treatment process.
  • Don’t pour DIY products (e.g. paint, thinners, turpentine and white spirit etc.) or car fluids such as engine oil, anti-freeze, brake fluid etc. down the drains.
  • Don’t allow rainwater, groundwater or large volumes of water (such as those from a swimming pool or Jacuzzi) into the plant. Chlorine kills the bacteria and the excessive water will increase the flow rate through the plant, not allowing sufficient treatment time.
  • Don’t fit a waste disposal unit under your kitchen sink. Disposing of organic matter through the treatment system increases the organic load, creating bacterial overgrowth which will inhibit the treatment process. Only use a waste disposal unit if your plant is specifically designed to accept higher organic loads.

KEE who are a member of British Water, have a copy of their:
Code of Practice – A Guide for Users of Sewage Treatment Systems  to download as a good starting point for information.

KEE Services recommend that your Sewage Treatment Plant should be regularly serviced to avoid any serious future costly problems – contact KEE.

Request a quote for a maintenance contract or call 01296 634500

 

 

 

KEE UK Developed RBC Project goes to Europe

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Low lifetime cost RBC wastewater treatment plant for total nitrogen and phosphorous (nutrient) removal

KEE Process was commissioned to develop municipal wastewater treatment plants and include features to ensure that the plants are designed to operate during the high summer and low winter loads without losing performance, provide low lifetime cost, low capital cost, low energy cost, low day to day operational input and low sludge production rates.

Over the last few years, KEE has provided solutions for total nutrient removal for small, medium and large scale systems and these systems have been type tested by various authorities. There is a requirement for many locations in the sun-kissed Mediterranean that systems are capable of operating during the high summer usage and low winter usage, whilst maintaining the plant performance. In addition to this, the plant must be able to operate without the need for daily or weekly operational input. KEE was required to produce two such systems, one for Southern Spain and one for Northern Spain. Both sites required operation in fluctuating summer and winter conditions.

Image-01

KEE 4.5m Diameter RBC – with built in flow attenuation system for plant process optimisation.

Site 1 in Southern Spain (warm sub-tropical climate) The plant in Southern Spain is a site that includes holiday chalets, a golf club, recreation clubs, restaurants and bars. The first phase of the plant had to operate for 10% of the ultimate design load, as the facilities were under construction but, as the facilities were gradually built and occupied, the plant had to keep up with the gradual increase in flows and loads whilst maintaining process performance. In addition, it was also a requirement that the plant was of a modular construction to phase the build programme to spread the capital cost. The first phase module had to be designed to treat 300m3/d of municipal wastewater but also had to cope with gradual increase in load.

The first phase module was required to treat:

  • 300 m3/d,
  • BOD 440 mg/l
  • NH4-N 74mg/l
  • TKN 80 mg/l.

The final discharge consent:

  • SS < 35 mg/l
  • BOD < 25 mg/l
  • COD < 125 mg/l
  • TN < 25 mg/l
  • NO3-N < 13 mg/l
  • PTOT < 2 mg/l

The plant proposed and supplied by KEE included prefabricated Glass-fibre Reinforced Polyester (GRP) Primary Settlement Tanks which provide the facility to separate gross solids as sludge, flow attenuation and sludge storage. This was followed by one 4.5m diameter, five-bank RBC, installed in an in-situ concrete tank. KEE RBCs include a patented flow-management system which provides a flow and load attenuation system for process performance optimisation and also creates the necessary conditions for nitrification – denitrification within the RBC.

The whole RBC is covered with lightweight GRP sectional covers. The RBC was fitted with an automated and fully flexible internal recycle system to manage the nitrification de-nitrification requirement of the plant.

For separation of biological solids generated in the RBC, the system includes a prefabricated hopper bottom GRP radial upward flow settlement tank with effective tank surface area of 19.2m2. The final settlement tank includes a fully automated pump-assisted hydrostatic sludge and scum draw-off system to periodically remove and return the scum and sludge to the head of the PST for co-settlement with primary sludge.

The plant components were built off-site in the UK and delivered, all ready for final assembly on site. KEE built the whole plant and all the internal pipe-work on-site in four weeks and was ready to receive flows shortly after that.

This newly built RBC plant covers an initial build phase on-site. The full development proposed increases over the next few years which will result in 10 systems of this size being built and installed at various times over an agreed time period. The energy consumption for the plant for the current low flow of 200 m3/d is 88 kWh/d. This is projected to be 115kWh/d when the flow reaches the designed high season flow of 300 m3/d.

Spot sample result five weeks after initial process commissioning flow rate of 200 m3/d.

                       INLET              OUTLET
                         mg/l                mg/l

BOD               440                 24.0
COD               716                  79.0
NH4-N               92                   5.2
TN                   98.8               19.2

 

Image-02

KEE 4.5m Diameter RBC – drive system.

Site 2 in Northern Spain (Temperate Climate)

The plant in Northern Spain was for a smaller population in a village of 170 PE initially, but the local authorities required that the plant should be capable of treating the future projected load from 400PE. The important features to be included in the design were that the same plant should be designed to comply with the performance for both the current load and future projected load whilst maintaining the minimal operations cost and sludge management cost.

The design criteria for the plant in Northern Spain were:

  • 17 m3/d for current PE of 170 & 40 m3/d for the future projected PE of 400
  • BOD 600 mg/l
  • NH4-N 75 mg/l
  • TKN 81 mg/l.

The final effluent discharge consent:

  • SS < 35 mg/l
  • BOD < 25 mg/l
  • COD < 125 mg/l
  • TN < 15 mg/l

The plant for this smaller contributory PE was designed and built along similar lines as the Phase 1 module  for Southern Spain and all the equipment was totally factory built, including the RBC which was housed in a GRP tank and also covered with lightweight sectional GRP covers.

Image-03       Image-04

KEE 2.35m Diameter RBC unit – on site installation and ready for receiving flows.

KEE supplied a 2.35m diameter RBC, fitted with patented managed flow system for flow and load attenuation, internal recycle, automated pump assisted hydrostatic FST sludge and scum removal system, together with  built-in flexibility to readily adapt the plant for such a large fluctuation in flows and loads, whilst maintaining full compliance with effluent discharge criteria including full nitrification and de-nitrification.

The plant was commissioned in April 2014 and the performance of the plant is significantly beyond the design expectation. The energy consumption of the RBC is 15kWh/d for the current load and is projected to be 35kWh/d for the future PE of 400.

Results for the 28 days test period on 95 percentile basis is detailed below for a flow rate of 17.8 m3/d.

                       INLET               OUTLET
mg/l                  mg/l

BOD               854                   9.1
COD             1,708                  62.0
SS                  518                  13.0
NH4-N             126                   1.3
TKN                135                  12.1

For both the sites, KEE also included a feature within the plant design to aerobically digest the sludge during low load periods to (a) reduce sludge management costs and (b) to keep the plant fully operational biologically and ready for the onset of the full load period.

The benefits for the client are that the ownership costs are reduced, the carbon footprint is reduced by avoiding long sludge tanker journeys and the plant is maintained in readiness for the increase in flows and loads of the peak period.

Author: Suru Nathwani B.Eng (Chem), Group MD of KEE

To see the capabilities of the KEE Group of companies please visit the KEE Group website.

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KEE SERVICES OFFER PLANNED MAINTENANCE AND OPERATION OF WASTEWATER TREATMENT EQUIPMENT BY ANY MANUFACTURER

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The maintenance and operation of wastewater treatment equipment is a specialised task and KEE Services Limited recognises this.

With its extensive experience of on-site servicing of all types of wastewater treatment and pumping equipment, its technicians have the knowledge necessary to protect its customers’ investment and the environment.

KEE Services Limited offers planned maintenance programmes ranging from an annual visit to full plant operation. Its aim is to respond to all of your urgent servicing and maintenance needs. The KEE Services Team of fully trained Technicians operates on both a local and regional basis to ensure a prompt and reliable service.

  • Emergency Services
  • Planned Maintenance
  • Breakdowns
  • Equipment Refurbishment
  • Plant Operation
  • Spares
  • Ancillary Products
  • Plant Hire

Committed to maintaining your environment

  • KEE Service Ltd offers Preventative Maintenance, Process Operation and Breakdown Services for all types of treatment plant and pumping equipment, from all manufacturers.
  • KEE Services Ltd supports its UK customers during out-of-hours emergencies by offering a 24-hour manned call out service.
  • KEE Technicians are trained in long-term servicing and look after over 8,000 installations in the UK. They have sound mechanical and electrical experience, combined with application knowledge, and can identify problems early.
  • Working on a local basis, KEE technicians give a prompt service and have a good understanding of the conditions and legislations in each area.
  • Service and maintenance contracts include routine visits to keep equipment from both KEE Process and other manufacturers in top condition and prolong its lifespan.
  • There is a range of contracts available or a package can be designed specifically.
  • If refurbishment or upgrading is necessary, KEE Services can advise on the alternatives.
  • Site assessment can be made and installations planned for new and existing sites.

For full information on KEE Technologies and Services visit the:
 KEE Services Planned Maintenance site.

KEE GROUP CAPABILITIES – OVER 350,000 WASTEWATER TREATMENT INSTALLATIONS WORLDWIDE

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KEE seeks to identify and satisfy the needs of their customers by providing quality engineered solutions priced to offer value for money. KEE has over 60 years’ experience in wastewater treatment, process engineering, servicing and operation with over 350,000 installations worldwide. 

 The technologies and services offered by the KEE Group of companies are listed below:

Design, Installation and Operation of On-Site Plants

  • Anaerobic Reactors – The KEE Group offer design, installation and operation of on-site treatment plants. Their technologies include anaerobic digestion, aerobic processes including RBC and Submerged Aerated fixed film systems, extended aeration and SBR activated sludge processes, complemented with physical and physio-chemical processes. KEE also have a team of experienced process engineers and project engineers capable of delivering solutions to suit

Rotating Biological Contactor (RBC)

  • NuDisc© Single Piece Packaged RBC Treatment Plants
  • Modular Packaged RBC Treatment Systems
  • Large Diameter RBCs for site erection

Submerged Aerated Filters (NuSAF)

  • Single piece NuSAF© Systems,
  • Modular Packaged NuSAF© Treatment Systems
  • Large NuSAF© – in on-site constructed concrete tanks

Activated Sludge Systems

  • Extended Aeration, Sequencing Batch Reactors (SBR)
  • Oxidation Ditch

Fine Bubble Aeration & Mixing Systems

  • KEE Triton Aerator/Mixer

Attached Growth Airlift Reactor (AGAR®)

  • Moving Bed Biological Reactor (MBBR)
  • Integrated Fixed Film Activated Sludge (IFAS)

Dispersed Air Flotation (DAF)

  • pre-treatment of industrial and food processing wastewater
  • KEE Microfloat® – Dispersed Air Floatation Technology,  for pre-treatment of industrial and food processing wastewater to reduce FOG, BOD, COD & SS. The KEE Microfloat system achieves the same result as conventional DAF systems without the need to use a high-pressure pump and venturi. It incorporates a system to produces extremely fine bubbles 10 to 50 micron air bubbles into the water to float the light fractions

Primary and Final Settlement Tanks

  • GRP Hopper Bottom Settlement Tanks – A range of advanced design Hopper Bottom GRP Settlement Tanks for small wastewater treatment plants.

Grease Management System – Biological Solution to Fat, Oil and Grease (FOG)

  • KEE Bio-GuardThe grease digester that’s the biological solution for the removal of Fat, Oil and Grease.

 

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For full information on KEE Technologies and Services visit the KEE Group website
or call 01296 634500