Scottish Water Invests in Wetland Scheme
Published on by Water Network Research, Official research team of The Water Network in Business
Water Company Has Invested £8.7 Million in an Aerated Wetland Scheme at Cowdenbeath to Improve its Combined Sewer Network
The water company has been working with reed bed specialists ARM Limited and Barhale Construction since September 2013 to design and construct a wetland scheme which will treat the spill flows from two Combined Sewer Overflows (CSOs) for attenuation and treatment before being discharged into the Lochgelly Burn.
Located to the south of Cowdenbeath Golf Course, the £8.7million project involved the construction of two units; the first a flow balancing shaft settlement system for sedimentation of solids and the second a 4,000m2, two metre deep saturated, vertical flow aerated wetland fitted with Forced Bed AerationTM (FBATM).
The new two-unit system has a 20,000m3 storage unit downstream with a controlled, pumped inflow rate to the wetland of 46l/second. The system will provide sufficient treatment to allow storm waters to flow back into the watercourses without compromising water quality.
Although the wetland is fitted with FBATM technology, it only needs to be switched-on during storm events when flow increases therefore optimising energy usage.
Scottish Water is investing in its combined sewer overflows so it can continue to meet stringent discharge consents. An increasing need to meet consents of 9.0 mg/l BOD limit and an ammonia-nitrogen limit of 1.5 mg/l lead to the conclusion that an aerated system which increased oxygen availability was the right choice.
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