The development of three strategies covering the three largest sewage treatment works owned and operated by Yorkshire Water is described. The first deals with the problems of sludge disposal in a large urban conurbation containing 51 sewage works and producing 75,000 dry tonnes of sludge per annum. The second describes the advantages of centralising sewage treatment facilities at larger works where the need to invest in the sewerage network is limited. The third deals with the method of evaluation used to derive the development plan for a large works at Sheffield. It assumes that an ‘ideal' solution can be achieved using a ‘greenfield site' concept and compares this with the more pragmatic solution of renovation.

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