A4 Water Treatment Process

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Wastewater Treatment Processes

Fine Bubble Aeration

Hydrok UK sole UK distributors for

A Q U AC O N S U L T

Wastewater Treatment ProcessesThe Wastewater Treatment Process historically demands a high level of energy input whichis contrary to current water management guidelines and legislative requirements. Anyimprovement in discharge quality using existing assets will require an increasein energy consumption at a time when regulatory demands require a reduction in energyuse. Hydrok UK, with it’s established ethos of providing innovative water engineeringsolutions, now offer significantly reduced energy solutions using fine bubble aerationsystems that deliver an extremely high efficiency with reduced power consumption.

Hydrok UK has established an associationand exclusive UK distribution agreementwith Aquaconsult, the market leaders in finebubble aeration.

The Aquaconsult range of fine bubblediffusers allow the Hydrok design teams toprovide highly efficient solutions that can,increase capacity of existing assets or,provide new builds with reduced civilrequirements and low energy consumption.

The fine bubble aeration process enables reduced energy requirements through increasedefficiency within the process and with the added benefit of reducing the whole life costs ofthe asset for little or no change to the capital investment required.

The fully comprehensive Hydrok aeration packages range from the optioneering stagethrough design and on to the manufacture, delivery, installation and commissioning - withall aspects of the contract managed and delivered within house. This ensures totalcommitment and control at every stage.

Hydrok UK, Warren Road, Indian Queens Industrial Estate, St Columb, Cornwall TR9 6TLTel: +44 (0)1726 861900 Fax: +44 (0)1726 862008email:[email protected] website: www.hydrok.co.uk


A Q U AC O N S U L T

With existing plants consumingnearly half of a percent of theUK total generated power, the

Hydrok solutions can make asignificant contributiontowards energy savings

within the Water Industry, and contribute to helping to

improve the environment.

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Design OptionsThe Hydrok UK approach to water treatment is reflective of a company wide philosophy;to deliver environmentally friendly and efficient solutions to the water industryrequirements, government ‘green’ policies and energy efficiency. For these reasons theHydrok UK design and engineering teams will always pay particular attention to theenvironmental impact of any project undertaken.

Approaches to any given proposed water engineering solution will always include carefulconsideration of suitable alternatives, such as:-

• Retrofit- expanding service capabilities within the existing current asset, utilising the industry

leading products and processes from Aquaconsult

• Additional on-site expansion- current asset expansion within the existing service area footprint and location

• New build- new site development to meet the water company requirement

Whichever route is the mostappropriate the Hydrok UK teamcan offer a built in contingencyfor later further expansion whilstensuring that an equilibriumbetween optimum efficiency isbalanced against capitalinvestment culminating in areduction in whole life costs of the asset.


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A Complete ServiceThe Hydrok UK approach to managing a water treatment project is based on a single pointof contact service covering all requirements. This approach enables an efficient control ofthe overall project design whilst permitting monitored, flexible design development in abespoke manner for each installation process thus leading to increased efficiency andmanagement of project costs.

Component elements of the project are managed by the Hydrok UK team:-

Aeration

• Hydrok operate as the sole UK distributors for Aquaconsult AEROSTRIP®

• Aquaconsult offer the most energy efficient fine bubble strip diffusers

• Hydrok in house technical team offer a complete project design and management service

• Hydrok supply total design, manufacture and installation service for the complete aeration plant package

• Hydrok can offer enhanced biomass activity throughthe addition of Biotextil Cleartec® curtains into the filtration tanks

Blowers

• Hydrok work closely with all blower suppliers.• All blowers specified jointly with manufacture and customer to match the design solution

Pipe work

• All Stainless Steel pipe work manufactured by Hydrok in house• Stainless Steel pipe is purchased from Outo Kumpu, manufactured within the EU• Both grades, 304 & 316 are available with ISO 9001 traceability

Valves

• Hydrok work closely with preferred valve suppliers• All valves are expertly specified and sized to match

the design solution

Instrumentation/Software

• Hydrok are able to specify all instrumentation• Hydrok have the in house expertise to support

the PLC provider

In House manufacturing

• In house CAD design • In house Finite Element Analysis• In house manufacture • ISO 9001-2000• Achilles & UVDB Verify

Hydrok works with the watercompany and the selectedcontractors not just for it. W

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AERATIONFine bubble aeration is a simple process, but one that consumes 0.481% of the total powergenerated within the United Kingdom. Therefore any efficiencies that can be found toreduce this demand make sound commercial and environmental sense.

Hydrok can provide significant reductions in energy consumption, along with reducedwhole life costs and very competitive capital costs.

At the root of each Hydrok solution is anAquaconsult AEROSTRIP® diffuser. This range of ultrafine bubble diffusers transfer oxygen to effluentmore effectively than any other type. This efficiencyallows the designers at Hydrok to reduce blowersizes, reduce air main diameters, and make savingson valves and other hardware. Energy efficiencies inthe range 40% over existing systems are beingprovided. By adopting the Hydrok/Aquaconsultsolution, immediate cost savings can be gained, or perhaps more significantly, existing

plants can be upgraded - with the increased efficiency thecapacity of an existing plant can be increased, sometimeseliminating the need for costly civil structures or new sites.

The operational life of an Aquaconsult AEROSTRIP® diffuser istypically in the range of 14 – 20 years, and with the unique wayin which the membranes self clean, whole life costs are reduced,and man entry into tanks for maintenance purposes is avoided.

The increased efficiency of the Aquaconsult diffuser is due tothe very fine bubble that is generated - this presents a greatersurface area for any given volume of air to the flow comparedto any other system. However, increased efficiency is alsoprovided due to the general arrangement of the diffusers and

the fact that they are secured directly to the tank floor; this increases contact time, and thecurtain effect of the bubble pattern avoids dead areas.

Hydrok, who are proud of their association withAquaconsult, and the exclusive distributorship for the U.K.and are looking forward to making a significantcontribution to the reduction in carbon emissions.

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AQUACONSULT AERATION FACTSAquaconsult have been designing and building what are widely regarded as the bestdiffusers available in the market for a number of years and, with the development of thenew generation ‘P’ type panels, ‘AEROSTRIP®’, even greater increased efficiency and costeffectiveness has been achieved. These diffusers offer the optimal symbiosis between lowcapital investment and low energy cost on the one hand, and maximum performance onthe other.

The diffuser is made from PVC-U with a polyeurathenemembrane, and depending on the density of diffusers on thetank floor, the efficiency of the oxygen transfer andsubsequently the standard aeration efficiency can be varied-resulting in an optimisation of investment and operating costs.

Exceptional operating properties

• The ‘AEROSTRIP®’ can be operated intermittently, allowing both nitrification and de-nitrification, resulting in large savings in energy requirements

• Flat design, allowing the ‘AEROSTRIP®’ to be fastened directly to the floor of the tank• Water flow created by a mixer is not hindered by the diffusers, unlike a dome design • No precipitations can occur underneath the diffusers• Oxygen transfer efficiency up to 60%• Aeration efficiency 3 to 5 kg O2/kWh• 0 to 100% control of air flow range• Non-clogging diffuser membrane• Capable of intermittent operation• Low maintenance requirements and costs• Extended operational life expectancy

Oxygen transfer in clean water

The outstanding qualities of the ‘AEROSTRIP®’ have been confirmed by numerous fieldmeasurements carried out by Public Authorities, Universities and independent researchinstitutes.

Operating characteristics in dirty water

Outstanding results are not only achieved in clean water tests,but also in practical operation with dirty water - tests showed aconsiderable alpha value of around 0.8 - and a significant lowenergy consumption level for BOD removal in plants.

Installation Variations

‘AEROSTRIP®’ offers a flexible installation system which allows for optimal adaptation to all tank shapes, sizes and volume requirements.

ISO 9001-2000 CERTIFIED

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ENHANCED BIOMASS FIXED BED SYSTEMHydrok is the appointed UK distributor for the Biotextil Cleartec® IFAS system, which whenused in conjunction with the Aquaconsult AEROSTRIP® diffusers offers even furtherefficiencies in the treatment process.

Biotextil Cleartec® is a textile product made of 100% polypropylene which by the nature ofits construction creates a large specific surface area on which biomass can grow. Theconstruction of the material permits good oxygen supply and prevents excessive growth ofthick layers of biomass thus maintaining the optimum efficiency of the process.

The Biotextil Cleartec® curtains are positioned directly above the diffusers, housed in aremovable frame, set parallel to the flow. The configuration of the material allows forflexibility and movement within the flow of the tank, leading to an enhanced performance,this in turn increases the capacity of the waste water treatment plant.

A PERFECT PARTNERSHIP

In order to maximise the volume capacity of the treatmenttank, diffusers should be as close to the base as possible withthe Biotextil Cleartec® curtains positioned ideally between40cm and 60cm above the diffusers. The best possiblescenario is the combination of the Aquaconsult AEROSTRIP®

diffusers and the Biotextil Cleartec® IFAS system.

The curtains are set to allow the flow to pass between themhorizontally, with the diffusers creating a vertical flow. As aresult the curtains are in constant motion and if thicker activesludge layers should attempt to settle on the material theseare shaken off and removed as a result of the movement. This‘shedding’ process prevents blockages and maintainsoptimum efficiencies and minimum energy requirements.

Hydrok are able to construct a bespoke cage system whichincorporates both elements, this allows them to be liftedfor routine maintenance without interfering with theoperational activity of the plant

Key Advantages

• Increased performance• Excellent nitrogen elimination• Reduction of surplus sludge• No blockages of the textile curtains• Reduced energy requirement


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BIOTEXTIL CLEARTEC® FACTSThe purification of effluent within a waste water treatment plant using encouragedbiomass growth is common practice but it is not always as efficient as it could be. Manyfixed bed systems have poor attached biomass to surface area ratios, which means a lowbiologically active surface. To achieve a good fixed bed operation the following essentialattributes should be exhibited:-

• A large specific surface area on which the biomass can adhere

• A surface area that guarantees a good supply of oxygen, which prevents development of anaerobic areas

• Optimisation of fixed bed biomass activity by utilising available maximum depth within the treatment tank

The objective is to increase the concentration of biomass activitywithin the aeration tank by maximising the correct type ofbiomass growth. This greatly enhances the tank performanceand increases the purification capabilities and capacity.

The Biotextil Cleartec® is a submersed polypropylene fixed bedwhich when installed with the Aquaconsult AEROSTRIP®

diffusers creates a combined process with both fixed filmbiomass and suspended activated sludge, creating an evenbetter purification performance.

Biotextil Cleartec® properties

The basic property of the Biotextil Cleartec® growth surfaces are loop tapes. These looptapes are manufactured into a textile material which is flexible because of the mesh design,and creates a large surface area for the active biomass to form on and adhere to.

Exceptional operating advantages

• Enhanced performance with reduced operating costs• Increase of solid matter content within the tank without

additional load to the final sedimentation• Reduction of surplus sludge• Excellent nitrogen elimination• Blockages eliminated due to the flexible nature of the

Biotextil Cleartec® curtains

Applications

• New plants• Retrofit• Systems for heavily loaded industrial waste water• Compact waste water treatment systems


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HYDROK DIFFUSER LIFTOUT GRIDS

Hydrok UK Limited’s Liftout Diffuser Grids arespecifically designed to allow the operator toremove and maintain the Aquaconsult AEROSTRIP®

diffusers without the costly need to drain theaeration tank.

The Hydrok liftout grids are advantageous to sitesthat have one, two or three tanks as it allows theoperational capacity of the plant to be completelymaintained whilst the liftout grids are beingremoved.

In most circumstances, the Hydrok unique guiderailsystem allows the liftout grids to be installed andcommissioned without the need to drain the tanks.The liftout grids are particularly suitable for retrofitapplications as all the necessary installation workcan be completed externally with the liftout gridslowered into place, brought online andcommissioned. We also have a range of liftout gridsthat we can hire out on short or long term. These aregenerally used on sites that have the need fortemporary or emergency aeration requirements.

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For optimum siteperformance and plantflexibility, the Hydrokliftout diffuser grids canbe designed to alsoincorporate theBiotextil Cleartec®

biomass fixed bedsystem within theframe.


HYDROK DIFFUSER LIFTOUT GRID FACTS

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Key advantages

• Can be easily removed in minutes without draining the tank

• Operational capacity of the plant is maintained• Total plant flexibility• Unique guiderail system• Eliminates costly tank drain down• Eliminates confined space man entry for

maintenance• Suitable for both new and retrofit plants• Can be combined with Biotextil Cleartec biomass

fixed bed system• Ideal for emergency aeration requirements

Applications

• New plants• Retrofit (drained tank)• Retrofit (full tank)


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Applications

• Permanent wastewater treatment plants • Mobile emergency response treatment units • Temporary treatment during planned maintenance • To supplement biologically overloaded works • Green Leachate treatment • Industrial waste treatment• Pilot treatability studies

HYDROK/ATAC HY-SAFHigh Efficiency Package Biological Wastewater Treatment Plant

The Hydrok /Atac Hybrid Submerged Aerated Filter (HY-SAF) offers a power efficient,robust, small footprint biological wastewater treatment solution individually designed toachieve the final effluent consent standard required.

HY-SAF package treatment works are suitable for treating municipal wastewater for100 - 3,000 PE (Population Equivalent) and industrial effluents - offering a completeturnkey package. With no moving parts in the main tank, the HY-SAF is simple to operateand low in maintenance. In order to minimise power costs, we incorporate control softwarelinked to a highly efficient motor control centre, this ensures effective and accurate blowercontrol/air delivery whilst maintaining the most efficient treatment process conditions.

HY-SAF Selection Guide

MODEL HY-SAF 300 HY-SAF 600 HY-SAF 900Population Equivalent* 300 600 900BOD Capacity (kg/d) 12.6 25.2 37.8Max Flow (l/sec) 3.0 6.0 9.0Power absorbed (kW) 2.2 3.0 4.2Module size (LxDxH) metres 2 x 3 x 3.5 2 x 3 x 3.5 2 x 3 x 3.5Number of modules 1 2 3Overall footprint metres 2 x 3 4 x 3 6 x 3

* Population Equivalent basedon 60gms BOD/h/d crude and30% removal through primarytank to give 42gms/h/d


HYDROK/ATAC HY-SAFOperating Principle

The Hydrok/Atac Hybrid HY-SAF treatment plants are fabricated from stainless steel cells.Each cell houses a number of the Hydrok Aquaconsult AEROSTRIP® fine bubble membranediffusers, which are mounted below a Biotextil Cleartec® media.

Cleartec media has many advantages over conventionalSAF block or random packed media. It is a fixed media IFAS(Intergrated Fixed-Film Activated Sludge) system utilisingsheets of textile supported by a rigid frame. For this

reason, it is not susceptible toclogging, which can reduce theeffective treatment area andtreatment efficiencies of conventional SAF systems.

The AEROSTRIP® diffusers provide air to efficiently maintain ahealthy treatment system, releasing dead biomass and removing theneed for backwashing. The media and diffusers are mounted withina removable frame assemble which can be simply lifted from the cellfor maintenance or inspection.

Flow enters the first HY-SAF cell at high level, passes through themedia within each cell in turn, and exits the final cell also at high

level. This arrangement ensures that the Biotextil Cleartec® media is constantly submergedand the HY-SAF remains permanently active during periods of low or no flow.

The Cleartec and AEROSTRIP® technology within the HY-SAF has a well provenperformance record supported by many installations throughout the wastewater industry.

The HY-SAF has a rapid seeding time from commissioning, quickly reducing BOD and likelyto be 100% effective within 2-4 weeks of start-up; this may be accelerated through theintroduction of activated sludge seeding, or by the addition of proprietary bacteria.

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FAdvantages of the Hydrok/Atac HY-SAF wastewater treatment plant

• Unlike conventional SAF units, no media clogging or sludge retention• No retained dead weight after draining down of cells • Reduced power consumption compared to conventional SAF units• Above or below ground installation• Robust performance• Simple in operation• Few moving parts in main tank• Low maintenance• Rapid installation• High performance – Ultra low COD / BOD and total N removal options • Hire units available


BLOWERSBlowers will be selected according to site specificrequirements and sized to suit the efficienciesoffered by using the Aquaconsult fine bubble airdiffusers.

The highly efficient Aquaconsult diffuser allowsHydrok to operate systems with lower airvolumes than alternate solutions. This providesthe opportunity to reduce blower sizes, savingboth long term energy costs and capital cost.

Existing reference sites are operating withpositive displacement tri-lobe designs, and withsophisticated centrifugal units that provide evengreater opportunities for reduced energyrequirements.

VALVESHydrok has carried out extensive tests on a wide range of valves, and can select from avariety of approved products to optimise the performance of its aeration systems.

The particular characteristics of each type of valve are known, and valves are selected tomaximise the efficiency of a design. In particular the dynamics of a valve can have a markedeffect on energy consumption, and also noise andheat. No single valve is suitable for all siteapplications, therefore the Hydrok design softwareand selection matrix is essential to ensure that themost appropriate and cost effective solution isrecommended.

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INSTRUMENTATIONTapping points for instrumentation will be provided wherenecessary. Hydrok will provide instrumentation if requested, orliaise with clients own process engineers to ensure provision ismade at the design stage to accommodate the clients ownrequirements.

MCC & PLCHydrok works with all reputable manufacturers to provide theMCC and PLC requirements and control software.

We do not provide this facility in house as we find that ourclients tend to have strategic alliances with their preferredsuppliers who can provide this service, and we can not provideany further efficiencies by including this element within ourscope.

Our relationship with theappropriate suppliers howeverdoes enable us to provide acomplete turn key package ifthe client prefers.

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HYDROK CONTROL CENTRES

Hydrok Control Centres are designed and built to thehighest standards conforming to the latest water industryspecifications, controlling from simple motor starters tocomplex systems incorporating PLC software control. Whensupplied with any of the Wastewater Treatment Processesor Water Management products offered by Hydrok, thesesystems enable the complete ‘black box’ supply to the endclient.

Hydrok are able to provide the complete road side kioskfully assembled within our factory facility in the South Westof England. The control panel designs suit particularcustomer needs and specific plant specifications without anydetriment to lead times due to our in house manufacturingfacilities which enable flexible production of specialmetalwork arrangements etc. All standard components arekept in stock, special orders are arranged via key supplieragreements for the supply of any non-standard customerrequirements.

All control panels and control centre assembles aredesigned, manufactured and certified to National(i.e WIMES) and International standards: BS EN61439-1:2009, IP31, IP54 and IP65 where required.In house factory testing and on site commissioningis carried out by Hydrok’s electrical engineers andsupported through to the issue of all necessarycertification.

Our design engineering division has an excellentworking knowledge of CDM regulations and workclosely with the client during the development of aproject. Hydrok utilise the latest CAD technology toproduce the system circuitry and component layoutsprior to customer approval and manufacture. Thecontinual review of new technologies enables theimprovement of system design and optimisationwhich benefits our end clients when faced with newchallenges associated with design, installation andoperation.

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HYDROK CONTROL CENTRES FACTS

Hydrok UK Ltd adhere to NICEIC designguidelines and approval processes, and areexperienced in the provision of new systemsinstallation for the control of screeningequipment to the UK Water Industry. Hydrokdeliver site services to the water industryincluding MCC installation and cabling plus theinstallation and commissioning of controlsystems.

Key advantages

• Complete design package• Latest CAD Electrical software• PLC Software design/development• In house Control panel Metalwork manufacture• In house panel manufacture• In house kiosk assembly• Full site installation service• NICEIC approved• ATEX installations• Experienced in CDM regulations• Compliance to BS 7671: 17th edition 2008, WIMES 4.01• Full documentation and O&M manuals

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IN-HOUSE MANUFACTURINGHydrok UK Ltd has a history of providing engineering solutions for the Water Industry andis the largest manufacturer of Static CSO Screens in Europe, and a major player in themechanical screen market.

Our manufacturing facilities operate within purpose builtmodern facilities using up to date machinery. Our tool roomfacilities occupy around 8,000 square feet and provide everyaspect of precision engineering, with CNC lathes, machiningcentres, surface and cylindrical grinders, spark eroding, andskilled personnel.

Our fabrication area occupies over 10,000 square feet, allowingfor very large structures to be assembled on the premises. Thisarea is fully equipped with the most up-to-date welding plant,CNC guillotines, CNC press brakes, rollers and manipulatorsand overhead cranes.

In addition to the general fabrication facilities a further 2,000square feet is devoted to production welding of thin wall pipe.Using the latest CNC controlled automatic welding plantHydrok can rapidly produce welded pipe to a consistent highquality.

By maintaining such a comprehensive manufacturing baseHydrok UK is able to provide traditional craft apprenticeships,many of our skilled engineers have trained within our ownworkshops and are now progressing into our managementteams. This provides a high level of support to our designers,who also benefit from the graduate training programs that thecompany provides.

Whilst perhaps not following current trends which tend todictate sub-contract philosophies, we believe that we areoffering excellent long term career prospects to our staff andlong term support to our clients.

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PIPE-WORK DESIGN & MANUFACTUREHydrok are specialists in stainless steel fabrication and provide clients with unrivalledexpertise in the welding and manipulation of thin wall stainless steel pipe.

Our own design engineers size and specify the air distribution pipe work to complementthe efficiencies of the Aquaconsult AEROSTRIP® diffusers, pipe diameters are kept tominimum sizes whilst carefully controlling air velocities to reduce inefficiencies and theresulting heat and noise.

All of our pipe requirements are manufactured in house using the highest quality materialssourced from Outo Kumpu. Our designer’s precise requirements are carefully produced byskilled craftsmen and coded welders using the latest techniques and advanced machineryin a controlled environment. Fully automated welding plant ensures consistent high qualitywelds with full penetration and smooth profile.

• Hydrok designs do not compromise on quality; for example, Hydrok manufacture stainless steelmounting brackets to eliminate risk of cross material contamination.

• Stainless steel continuity cables are used throughout every installation. Individual pipes sections are tagged and referenced, ensuring that replacement sections can be provided within one working day, with all materials traceable to source.

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INSTALLATION PROCEDUREManaged from head office with regionally based satellite teams and backed up fully by anational service, the Hydrok UK installation procedure is a considered, professional onethat ensures the final stages of the project are fulfilled with the same efficiency that thedesign and manufacturing stages have undergone.

Delivery:

• Hydrok own and run a fleet of vehicles from site vans to 6.5 tonne Lorries

• Our dedicated logistics team coordinate the fleet througha tracking system to ensure efficient transportation

Installation:

• All of our schemes are installed by qualified Hydrok site engineers

• Installations are fully supported by our factory based staff and transport coordinators

Testing:

• Hydrok are equipped to carry out all site testing of the pipe work and diffusers• Our in house commissioning engineers carry out diffuser pattern tests and assist with

the oxygen efficiency tests

Commissioning:

• Hydrok are able to support commissioning from local depots across the UK

• Hydrok employ in house commissioning engineers

POST INSTALLATIONWe don’t just walk away at the end of the project!

Maintenance:

• The Hydrok and Aquaconsult aeration system is specifically designed to reduce maintenance requirements

• Programmable sub routines within the operating software enable automatic routine maintenance

Guarantees:

• Hydrok offer efficiency and performance guarantees• Aeration efficiency guarantees of 4 kg 02.kWh

are common• Extended product guarantees also available


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DELIVERYHydrok runs a fleet of extended chassis vehicles built specifically for the transportation offabricated pipe. Pipe is racked in specially manufactured stainless steel spillages that reduceoffloading time, and protect the pipe from impact damage and cross contamination fromother types of restraint.

Our own vehicles are 6.5 tonne capacity making them ideal for daily deliveries. Very largevolumes are delivered using specialist carriers, but still utilising the unique stillage systemto ensure that all pipe and components arrive on site in the same condition that they leftour factory.

Details such as loading our stillages so that pipes are delivered in the correct sequence forinstallation, pre-packaged flange fixing kits, and purpose made transportation seals on allopenings all contribute to reduce installation time.

INSTALLATIONAll of our schemes are installed by our owninstallation engineers. A core team of engineerswill be assigned to the site, supportedstrategically by additional specialist teams whenadditional resource is required.

Our teams are fully supported by our factorybased staff and transport co-ordinators.

All of our staff are appropriately trained toensure a safe and efficient installation.

All areas of risk are considered and eliminatedwhere possible. This is illustrated well in our use

of drilling rigs that eliminate therisk of white finger, whilstdramatically reducing the timetaken to carry out the task.

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TESTINGAll air main pipe assemblies are pressure testedduring the installation phase, mobilecompressors are used in conjunction withblanking plates and isolators to pressurisespecific areas and check that pressure drops arewithin predetermined limits. A test rig usingcalibrated gauges ensures consistent andaccurate results.

As soon as the blowers are ready and air is madeavailable a dry leak test will be carried out oneach drop leg and diffuser joint using a soapbased solution. Once this has been completedsufficient clean water or good quality finaleffluent will be required to a depth of 100mm above the diffusermembranes. A wet inspection can then be carried out.

Once basic leak testing is complete, a diffuser pattern test will beperformed to ensure that the diffusers have uniform airdistribution and there are no dead zones within the aerationlanes.

Oxygen Transfer Efficiency (OTE) tests can then be undertaken ifrequired.

Scaled tests can be carried out at the Aquaconsult technicalfacility in Vienna as an economic alternate to commissioning fullscale tests on large tanks.

COMMISSIONINGHydrok are aware that the commissioning phase ofany scheme can become an extended affair. Ourinput at this stage tends to revolve around mainlymechanical requirements that are quickly addressed.

Our presence however may at times be required tosupport other elements during this phase, this hasbeen addressed by providing locally based depotsand commissioning engineers who can respondpromptly when attendance is necessary. This policyensures that time spent on site is cost effective.

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GUARANTEESAll elements of the installation including thediffusers will be guaranteed for a period ofone year. Extended warranty periods can benegotiated for a small additional cost.

Written guarantees will be provided toensure that agreed levels of efficiency andperformance are delivered. These are sitespecific but aeration efficiency guaranteesof 4 kg O2/kWh are common.

Linked to our planned maintenanceprogram we can ensure the smooth runningand efficiency of our installations for the lifetime of the plant.

MAINTENANCEThe Aquaconsult range of fine bubble diffusers and Hydrok’s unique approach to designhas reduced day to day operator maintenance requirements to an absolute minimum.

Routine maintenance is carried out automatically by sub routines programmed into thecontrol of the system. Diffuser membranes are cleaned daily by a deflation cycle that flexesthe membrane, effectively removing organic growth and deposits. The frequency of thisflexing cycle is increased if the pressure within the system exceeds pre-determined setpoints. The number of flexing cycles is recorded and should this exceed recommendedlevels an acetic acid dosing cycle may be initiated to clean more thoroughly.

Therefore depending on local conditions manual cleaning will besignificantly reduced or eliminated. In the unlikely event of manualcleaning being necessary, it is a simple process using a high pressurehand lance.

Hydrok will also provide a planned maintenance programme toensure optimum performance at all times. This will be carried out byour own locally based maintenance engineers.

The manual cleaning of tanks and diffusers should be avoidedwhere possible. By using extractable sample points that provide asafe means of examining the conditions at the bottom of the tankwithout draining down, the need for man entry can be significantlyreduced.

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A4 Water Treatment Process

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