Specialist in Odour Control Cover Design, Manufacture & Fitting.
The cover above is fitted to a 24 metre diameter primary sewage tank for odour containment.
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Specialist in Odour Control Cover Design, Manufacture & Fitting.
The cover above is fitted to a 24 metre diameter primary sewage tank for odour containment.
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Meols Client: GCA UUIA Site : United Utilities Meols WwTW
The Contract initially to cover the inlet works to contain odour below the covers from where it could be ducted to a new purpose built Platsicon Odour Control Plant. A major consideration was the regular flooding of the area to be covered. Covers would need to not only contain odour but be able to withstand flood water in excess of 2 metres depth. Working with the Client and the consultant a solution was developed utilising an array of “flood pressure relief hatches” to balance water pressure above and below the covers. As can be seen from the picture below the inlet is at a very low level.
The area upstream of the screens has inlets to the left and right of the photograph combining into an open chamber feeding two screens and a storm overflow fitted with a spiral screw arrangement. The storm screen presented a challenge in that safe access was required to both visually inspect the screen and also allow free access along the entire length for removal and cleaning. A fully accessible area with a green non-slip finish was designed to meet the operator’s requirements. We believe that where possible and practical the input of the end user is invaluable in getting it right first time and preventing re-work.
As can be seen a solution was developed that gave the operatives a safe means of access to the area with covers loaded at 1.5Knm2 as specified in WIMES 8.05 appendix G accessible covers. Access steps and handrail was supplied as part of the contract
Grey is now our standard colour for non accessible covers which are rated at 0.75Knm2 classed as occasional access for maintenance. The picture to the left shows covers from both sewer inlets to the step screens.
The inlet is unusual in that the grit is removed by use of a Bendy Channel not the conventional detritor chamber As this area was already hand railed the covers were considered non accessible giving a considerable saving over the original plan to remove the rails and have the covers accessible at the higher loading. .
During the manufacture of the inlet works a further contract was negotiated to cover the Primary Settlement Tanks and the main works Pumping Station.
Prior to the covers being fitted the scraper mechanisms in the tanks were being replaced. Consideration on how access to maintain and replace scraper blades would be achieved through the covers was discussed and a solution developed. The final cover design was agreed with a complete section of infill panels which could easily be removed and replaced without any special tools. Training was carried out with the site operatives on the safe use of running lines and fall arrest equipment which was supplied as part of the contract.
The picture shows the finished tanks with a surface area in excess of 2,200 square metres.
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