Tertiary treatment alternatives to achieve nitrogen and phosphorus removal from wastewaters
Many wastewater treatment plants in the UK will be required to achieve removal Of both mtrogen and phosphorus in order to meet their consent obligations under the EC Freshwater Fisheries Directive and the Water Framework Directive.Where possible Water Companies will attempt to deliver these consent requirements using biological nutrient removal techniques.However wastewater in the UK is very weak and rarely contains adequate carbon to deriver both nitrogen and phosphorus removal by this mechanism.Indeed for many treatment plants there is inadequate carbon over the whole of the winter period and additionally during storm events over the summer period.Chemical dosing can be used either to supplement the available carbon(generally as acetate to achieve phosphorus removal or methanol for nitrogen removal)or as ferric to precipitate phosphorus.However both of these techniques are seen as unsustainable and thus more environmentally benign techniques are required.This paper will examine some of the more novel techniques currently being trialled in the UK at both laboratory and full-scale and these include the applications of recycled glass as a filter medium and a range of naturally occurring minerals that demonstrate phosphate adsorption properties.
Nigel HORAN
School of Civil Engineering,The University,Leeds
国际会议
西安
英文
71
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）