Apr 19, 2012

Upgrade to Take Place at Thames Water's Mogden Sewage Treatment Works

Veolia Water Solutions & Technologies to build four new pasteurization streams

Veolia Water Solutions & Technologies will design and build an extension to the existing Sludge Pasteurisation Plant at Thames Water’s Mogden Sewage Treatment Works. The work is part of a major upgrade that will see Mogden’s process capacity increased by 50%. The increased throughput means more sludge production at the works, and this will be digested to produce biogas fuel that will meet the GLA’s target of 20% energy for the entire works from a renewable source.

The works extension is required to limit the quantity of partially-treated storm water discharged following heavy rain by increasing the works’ capacity of 1,064-million-gal-per-day flow to full treatment and to meet a revised consent. The resulting increased flow to treatment will result in a higher sludge load to the Pasteurisation Plant and then to the Digesters; the Pasteurisation Plant being a process adopted to kill pathogens before the digested sludge is taken off site for disposal.

To provide the additional pasteurization capacity needed, principal contractor Black & Veatch selected Veolia Water Solutions & Technologies. Each of the four new pasteurization streams will comprise thickened sludge transfer pumps, a pasteurization reactor, a heat exchanger, reactor blowers and pasteurized sludge transfer pumps. Each stream of the new plant will be controlled by a local control panel which will interface with the Mogden SCADA system.  Site construction started in September 2011 and is scheduled for completion by January 2013.