Water & Wastewater Treatment

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PUMP HIRE, SALES & SERVICE 08450 733835 www.selwoodpumps.co.uk UK's No1 Pump Hire Specialist www.wwtonline.co.uk | WWT | MAY 2014 | 19 The chosen system consists of ten Biological aerated flooded filters (Baff) cells using media held in suspen- sion by air forced through the cells by five blowers Project focus: Southern Water STW is based on laser technology and precision metal forming, to provide a system with inherent adjustment ca- pabilities which overcome and accom- modate civil construction tolerances which are oen encountered. The aeration systems are manufac- tured from stainless steel tubing with a stainless steel support framework and Axilock couplings, which reduce or negate the necessity for positional welding and reduce the time to com- plete the installation. The stainless construction means that these plants have a long life with minimal service requirements. In some cases, the working area can be designated as a confined space, which imposes restrictions or prohibitions on working practices such as welding. In such cases, strict health and safety procedures must be followed, which include working with gas monitors and escape systems, all of which are covered by BCI's staff training scheme. The new installation has been designed in such a way that space has been set aside for possible expan- sion should more stringent discharge standards come into force in the future. The designers have ensured the BAFFs can be upgraded to include simultaneous nitrification/denitrifi- cation capability as well as leaving additional space for the introduction of a tertiary treatment stage, should additional treatments be required. The new treatment works at Peace- haven is also covered by a turf-covered 'green' roof, one of the largest in the Europe. It is planted with downland grasses to help it blend into the sur- rounding landscape. At Peacehaven alone, more than one million cubic metres of earth was moved, all of which was reused on site as part of the extensive landscaping. The treatment works covers just one third of the construction site, the rest having been returned to agri- cultural land and a new park for the community. BCI has worked with many of the world's major utility companies, brew- ing and beverage, food producers, food processors and pharmaceutical companies, to deliver full turnkey installations and an unrivalled ser- vice. BCI is committed to meeting the continually high standards of its cus- tomers with a focus on safety, quality and the environment. The company uses its design experience to turn customers' require- ments into working reality, efficiently and economically. • Perspectives The client "This is a huge achieve- ment and a credit to the team who have worked tirelessly to reach this goal. The breadth and complexity of the project has thrown up many challenges along the way, but we have risen to those challenges and produced a fantastic as- set for our client." Phil Risbridger, contract manager, 4D The supplier "Our reputation is for providing the very high- est standards of work- manship, on time and on budget. Like any quality contractor we achieve this by rigorously train- ing our staff, operating strict working proce- dures, risk assessments and method statements, and using the latest 3D CAD so ware to develop concept designs into working assemblies." Andrew Clouds, BCI Process • Innovation ● In order to meet ambitious environmen- tal targets for the site, designers had to imple- ment very space-efficient processes, one of which was constructed and in- stalled by expert provider of stainless steel process pipework, BCI Process ● With the chosen loca- tion of a dry valley in the chalk downs, north of the coastal town of Peacehav- en, both compactness and low profile were important selection criteria. Allow- ance also had to be made in the footprint for treat- ment expansion to meet possible future tighten- ing of discharge consent conditions. In terms of the secondary treatment, it was vital to select the most suitable compact treatment process that could fit in the con- strained site and deliver the desired outputs ● Sites which have the luxury of space typically employ percolating filters with rotating spray bars, but these would have been impossible to imple- ment in this situation. Designers required a high rate biological treatment process with a minimal footprint. The chosen sys- tem consists of 10 biologi- cal aerated flooded filter (BAFF) cells, using media which is held in suspen- sion by air forced through the cells by five blowers, delivering air through a common manifold.

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