Waste Water Treatment Experts Since 1979
The company commenced trading in 1979. Specialist activities include the design, manufacture, supply and construction of purpose built plant and equipment for use in water supply systems and treatment of municipal sewage and industrial waste water. Sewaco manufacture a wide range of HYCOVER rotary distributors including trough arm, standard arm & self dosing siphon types suitable for either pump, gravity or siphon feed systems. The HYCOVER machines are designed to handle a wide variety of application rates with flows from 5 l/s to 980 l/s. A full range of treatment plant design and construction services are offered. These include site investigation and report preparation; project and process design and costing; plant layout design; equipment selection procurement and installation, commissioning, plant operative training and plant maintenance. Purpose designed ordered plastic media biological filter beds for a range of biodegradable wastes are constructed to meet specific requirements. These include
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plant to handle carbonaceous effluent nitrifying and denitrifying applications. Sewaco, in conjunction with their electrical equipment suppliers, offers a comprehensive service for design, supply and installation of motor control panels and electronic control systems that can be used to decant supernatant liquor or act as controlled flow discharge from balance tanks and storage vessels.
the structural element. A wide choice of finished colours is available to meet local planning requirements. All structures are formed from materials that are aesthetically pleasing and suitable for recycling at the end of their operational life.
HYCOVER Distribution Systems
HYRATE Biofilters
Plastic media biofilters require specific wetting rates to prevent build-up of biomass within the media pack. Sewaco HYCOVER static and rotary distributors have been designed to meet these requirements.
Sewaco has developed a range of open and closed top rectangular and polytower structures suitable for containment of modular plastic media. The design of each containment shell ensures adequate ventilation of the media pack. Shells can be single skin internally clad or double skin externally clad with internal impervious membrane for maximum protection of
HYCOVER rotary distributors are arranged for reaction drive and can be fitted with variable speed electric drive. Periodic flushing can be achieved when electric drive is provided. In the event of power loss, machines automatically revert to reaction drive. Machines are fitted with stainless steel tubular or open trough type arms.
The HYCOVER rotary distributors manufactured by Sewaco incorporate many unique features to ease routine maintenance and field servicing. Built from standard materials including galvanised steel bowl and central support column, with heavy duty upper bearings fitted with slow release greaser cartridge. Low level stabilisers are located beneath the bowl. Stainless steel distributor arms are supported on stainless strainer wires. HYCOVER nozzle assemblies incorporate back entry `quickstrip’ nozzle rodding caps and plastic nozzles, with stainless spreader plates, arranged to ensure even application of liquor across the media plan.
size from 4.0 up to 35.0 mt diameter, are available that can be arranged to receive up to 8 times D.W.F. Centre bowls and main support columns are fabricated from GMS or stainless steel materials dependent on site requirements, with integral dosing syphons where applicable for stainless tubular type arms. Special spreader plates are fitted to ensure curtain effect distribution onto media surface. Nozzle rodding caps and full flow washout end caps are provided to simplify routine maintenance. Centrally mounted belt drive electric power units are offered where speed control and periodic slow speed operation is required.
Rotary Distributors
HYCOVER rotary distributors are available in a range of designs, including 2, 3, 4 & 6 arm versions that can handle a wide range of gravity or pumped feed rates. Open trough machines are often selected to cater for larger flows.
Sewaco manufactures a range of rotary distributor machines. These include self dosing HYCOVER rotary distributors, together with machines suitable for gravity and pumped feed. Machines, ranging in
Our over mounted cartridge type assembly provides easy replacement of bearing thus avoiding the need for heavy plant to carry out the majority of repairs and maintenance. The unique HYCOVER design also avoids the need for a water seal arrangement on standard designs with the exception of the ‘Lo-head’ version.
Trough Type Rotary Distributors The HYCOVER range of rotary distributors can be fitted with stainless steel open troughs, incorporating our unique design to minimise Vee notch blockage. Trough machines also incorporate anti surge control which prevents flow tracking from one trough to the opposite trough. HYCOVER machines are individually designed to meet the irrigation requirements of modern plastic media biofilters where adequate flushing rates are essential to optimise biofilter performance.
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Pen Mill case study Pen Mill Sewage Treatment Works for Wessex Water: Filer at Pen Mill was built as a part of capital refurbishment project that required a new HRF filter with an enclosed odour control system to be build prior to refurbishment of other filter equipment on site. Sewaco designed, manufactured, supplied, installed and commissioned 16.0 mt diameter HYRATE polytower plastic media biofilter complete with roof, timber support matrix and packed with 805 m³ modular plastic media. Electrically powered HYCOVER trough type rotary distributor and access stairway. Distributor is capable of receiving up to 248 lt/sec. Packed depth 4.8mt. It’s a 10 sided polytower structure.
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Static Distribution Systems
Roughing Filters
Static systems are designed to suit the plan area of HYRATE rectangular biofilters while rotary distributors are designed for circular filter shells and HYRATE polytower structures. Static distributors can be fitted with AUTOCLEANSE, our automatic nozzle cleansing system. This minimises biomass accumulation and thereby reduces plant maintenance. Our AUTOCLEANSE automatic nozzle cleansing device, improves overall efficiency of the installed distribution system by preventing build-up of biomass within nozzles and assisting in dislodging of non-organic solids, thereby maximising the use of installed media at all times. AUTOCLEANSE is essential for use in `confined space’ installations, where access is restricted or site maintenance is limited.
Sewaco range of HYRATE rectangular and polytower biofilter shells are suitable for use where roughing filters are required.
Static HYCOVER distributors have no moving parts, providing a low maintenance trouble free system. HYCOVER distribution systems are normally designed to receive a pumped feed, although systems for gravity feed with an integral dosing syphon are also offered. Wetting rates from 1.5 to 13.0 m3/m2/ hr are supplied to meet a wide range of applications catering for normal and storm flow conditions. This can be achieved by using single, dual and triple systems.
Factory assembled, pre-fabricated and tailor made timber media support matrix modules are designed specifically for use in conjunction with modular plastic media. Specially treated timber beams provide excellent ventilation of the media pack, avoiding accumulation of sludge pockets on wide surfaces, and accept full operational loads at up to 600 kg/m3 of media with adequate safety margin to ensure long and effective operational life. Timber is graded and cut to specific lengths prior to being treated with a high strength AC500 solution. Modules are
Nitrifying Biofilters Using the HYRATE filter design and HYCOVER distributors, impressive reduction of ammonia levels with high flow rates can be achieved.
pH Control Control of pH forms an essential part of most chemical and biological treatment processes. pH control systems including makeup, dosing and monitoring plant are offered as part of any design package, with a range of selected good quality equipment provided which meets most applications.
Media Support Matrix Modules
Shepton Mallet case study Shepton Mallet Sewage Treatment Works for Wessex Water and GENoco:
then factory jig built to produce easily transportable modules. This modular system can be manufactured to suit any configuration of containment structure. Modules are delivered to site, ready for installation on prepared concrete dwarf walls, prepared by the civils contractor to our outline design. The system is quick and easy to install. On completion, it provides a working platform from which to construct the HYRATE containment shell. Our modular media support system provides an exceptional service life, combining effective air flow with free drainage for the media pack, minimising cell blinding at point of contact.
Media Guard Product comes in various dimensions from 1 to 4 meters wide, placed in panels, joined together to form a complete membrane to prevent trash entrainment of the biological pack. Media Guard can be retrofitted or as a part of the new build specification.
Sewaco Ltd has been working alongside Trant Construction, Wessex Water and GENoco to renew the four roughing filters on the Shepton Mallet STW refurbishment project.
Thanks to the refurbishment, the ventilation has been changed, so fresh air is drawn in and down through the media, meaning odorous air is extracted from the bottom of each filter.
The roughing filters refurbishment was one part of a major project where work was split into two, with the first scheme addressing the requirements for phosphorus removal and improving the process reliability of the site.
During refurbishment, a portion of flow from each roughing filter had to be diverted to an old balancing tank that was converted to a plastic media filter. This was in accordance with site compliance.
The key elements to the project, which began on site in May 2012, entail a new ferric dosing plant, new tertiary sand filters with an associated feed pumping station, and the extension of the raw sludge tanks incorporating a new feed pumping station and new sludge tank mixers. Sewaco has been a key part of the project, carrying out work to remove old plastic media from all four filters.
The balancing tank filter is uncovered and had to be fitted with a temporary carbon odour control unit for the duration of the roughing filters refurbishment. As part of the project, the old PVC filter media material was removed by Sewaco and transported to Wessex Water Avonmouth STW for recycling. It is a vital part of working towards Wessex Water’s aim of achieving zero waste to landfill by 2020.
Work was necessary to refurbish these roughing filters because the existing ones were in poor condition and ventilation is abstracted from the top of the media, making access to the distributors difficult due to high levels of H2S. Therefore, complete refurbishment of all four filters was required. This included new tank walls, roof, media and refurbishment of the distributors. Reliant supplied the roofs and replacement tanks, with Sewaco providing the support structure, new media and distributor.
Service & Maintenance Sewaco provides a full after sales service together with routine maintenance and contract service for all types of sewage and effluent plant installations.
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SENATE Water Meter Boundary boxes manufactured by Sewaco A range of underground boundary boxes are manufactured which are fully WRAS approved and certificated for use on potable water supply. All include the efficient MBS Manifold that incorporates stop tap and non return valve with top entry meter mounting point that accepts all types of screw-in water meter. SENATE Box is suitable for all domestic and small commercial installations, available as a wet enclosure with 200 mm dia guard tube. Fitted with JG Speedfit ‘push fit’ socket type horizontal inlet and outlet connections. All boundary box units are fitted with the JG range of Speedfit ‘push fit’ connections. All boxes are built to order which allows us to modify it to suit client’s requirements. Our meter boxes are suitable for installation of RadioRead AMR meters. For installations in wet ground conditions, our box can be easily modified to elevate the manifold inside the box, which prevents the water meter to be submerged in water. SENATE water meter boxes are easy and quick to install. The MBS manifold is an all plastic unit, with the main components manufactured from Hostaform. The manifold incorporates John Guest ‘Speedfit’ 25 mm pushfit couplings; Watts Ocean backflow prevention valve and ‘screwdown’ type stop tap valve. The manifold has been subjected to test pressures in excess of 25 bar, with no sign of distortion or leakage. The manifold is fully compliant with WRAS and WRC requirements for products suitable
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for incorporating in products for potable water supply. MBS manifolds are incorporated in SENATE Boundary Box assemblies. The manifold can also be used as a ‘stand alone’ unit and in multi manifold installations. A special TEE handle is supplied for operation of the ‘screw-down’ stop valve. This handle is designed to protect the valve spindle by incorporating a degree of twist to ensure that, in the event of abuse, the tee handle will fail before the valve spindle. MBS Manifolds accept all standard bottom entry Meters fitted with 1.5” threading male connection. Manifolds are supplied fully pressure tested to 10 bar in each Meterbox base assembly. This ensures integrity of all internal seals. Loose manifolds are available as tested assemblies suitable for a range of applications as single or multiple assemblies. A range of Guard Tube lengths are available from 555 mm - 1500 mm. This allows installation of unit and supply pipework at up to 1500 mm depth. All guard tubes are fitted with dense expanded P.E foam disc for frost protection. The base unit is formed from a single moulded plastic component. The MBS manifold is mounted in a support socket formed within this base moulding. 25 mm MDPE inlet and outlet SPEEDFIT socket connections are fitted as standard. All pipe terminations are fitted with plastic dust caps. A 200 mm PVC guard tube is fitted as standard, with snap ring to provide a secure fixture of guard tube to base assembly.
Main characteristics of SENATE water meter boxes: • 200mm Ø guard tube of variable length between 500 & 1500mm to suit application. • Accepts all standard cast iron or plastic surface boxes. • Manifold accepts all 1.5” bottom entry water meters.
• Tough acetal copolymer manifold designed to reduce head loss. • Incorporates meter / sampling point and non-return valve. • Light action stop valve supplied with torque limiting handle to prevent over stressing. • Manifold service pipe connections available as 25mm MDPE sapphire push fit couplings. • Meter unit can be serviced without excavation or special tools. • Product manufactured in the UK in accordance with ISO9001 quality principles. • Manufactured to standard EN 1717:2000 Robust assembly withstands heavy wheel loads.
Types of Water Meter Boxes: Standard - for installation of 1 water meter for domestic or commercial installation. Draindown - The intention of the drain down unit box is to drain the property during periods of non-residence, particularly suited to holiday lets where winter occupancy is not required. Hydrant - This type of Water Meter Box provides the ideal way of connecting flexible hoses to underground supply mains. Suitable for use with both, potable and recycled water for irrigation of formal and pleasure gardens, camp sites, etc.
Multiport manifold water meter box Main benefits: • Possible installation of even 16 water meters in one chamber. • Chamber minimum size 600 x 400 mm. • Manifold accepts all 1/2” BSP bottom entry meters. • Tough acetal copolymer manifold designed to reduce head loss. • Fitted with Watts Ocean check valve tested to 10bar. • Second check valve can be added on the inlet feed side.
• Light action stop valve supplied with torque limiting handle to prevent over stressing. • System can be fitted on a wide range of service main pipe sizes 90 / 110 / 160 mm standard options. • Manifold service connections available as 25mm MDPE sapphire push fit couplings. • Meter unit can be serviced without excavation or special tools. • Product manufactured in the UK in accordance with IOS9001 quality principles.
Steffturbine - Power from Water – the ecological answer Steffturbine is a new product that Sewaco is providing to the UK market that gives a sustainable energy supply. Only recently introduced, Steffturbine’s benefits to customers are wide ranging. As well as providing a high return on capital, it is cost effective to install, environmentally friendly, weather-proof, and is highly efficient. The Micro Hydroelectric Turbine utilises an effluent outfall that has a minimum flow rate of 250l/s with a height
differential from 2.5m to 5m. The 12kw modular unit will generate power based on the potential created by the weight of water within the machine. The land based control system supplies power via an export meter to the national grid or site services. The conveyor turbine is installed on an optimum incline of 30° which improves the capture of potential energy within the enclosed conveyor.
input when included within a new design. Retro-fitting a micro Hydroelectric Turbine into an existing outfall may require additional infrastructure, hence the need to tie up with a civil engineering contractor. Most Hydroelectric units utilise high speed turbine blades to drive the rotor which requires very clean water. The Conveyor system is designed for high volume low head application and can cope with a wide variety of water & effluent sources. This makes the conveyor turbine particularly suited to final effluent applications.
The unit requires minimal civil engineering Thanks to the unique concept, the natural environment is hardly disturbed – in marked contrast to existing technologies. The Steffturbine is positioned above the surface of the water, so that the ecosystem remains as pristine as possible with zero emissions and no CO2. This system is currently being offered in northern Europe and Sewaco Ltd have been asked to market this system in cooperation with WRH Walter REIST Holding AG, based in Switzerland.
Main Benefits: • Sustainable power supply. • Fixed electricity price for lifetime of generating system. • Reduce carbon footprint.
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Sewaco Limited Eastgate House, 87, Eastgate, Deeping St James, Peterborough PE6 8HH
Phone: 01778 342202 Fax: 01778 346633 Email: info@sewaco.co.uk www.sewaco.co.uk