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DOI : ,    Vol.3, No.4, 81 ~ 84, 1995
Title
Articles / Emerging Technologies for Nutrient Removal : A Review of UK Developments
John Upton
Abstract
The European Community Urban Waste water treatment directive will lead to a number of sewage treatment works in the UK having to remove nitrogen and phosphorus. This paper reviews the activities by those Water Companies most directly affected; and describes the experiences of North West Water and Anglian Water removing phosphorus by chemical precipitation. Elsewhere Thames Water and Severn Trent Water have built full scale N and P removal plants to assess the suitability of Biological Phosphorus removal for UK sewages. Nitrogen removal in the UK will be a restricted requirement affecting only those discharges to waters abstracted for potable supply, and the author describes the UK experience with denitrification in Deep Bed Filters a technology particularly suited for Nitrogen removal at trickling filter plants. At larger Activated Sludge plants work is described on the removal of high strength Ammonia and Nitrogen in the recycle streams from sludge treatment centres. The Author describes the experimental programme on Enhanced Biological Phosphorus removal (EBPR) in Severn Trent Water at Stratford-upon-Avon where a full scale trial is underway comparing Mainstream process designs (UCT, JHB) with the side-stream Phostrip^(TM) system. Results will be presented that illustrate the significance of sewage strength and characteristics in the biological removal of P; with the addition of Short Chain Fatty Acids (SCFA) from an on site fermenter being essential for the mainstream process to remove P to below the target standard of 1 ㎎/l. The Phostrip^(TM) process is more tolerant of weaker sewage and results indicate that target standards can be met without the addition of SCFA. The author will also provide a cost comparison of different ways of uprating an existing nitrifying activated sludge plant to achieve nitrification, denitrification and phosphorus removal.
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