Limit of treatment nutrient removal in cold climate

研究将解决所有加拿大市政当局面临的一个主要问题：如何经济地升级现有的废水处理工艺，使其在降低营养物含量（氮和磷）方面达到更严格的出水质量。生物营养物去除（BNR）提供了成本最低的处理方法，避免了接收水的施肥。在某些情况下，现有的紧凑的城市基础设施现在必须达到处理污水的极限水平。在这种条件下处理冷的、稀释的废水是困难的，并且导致新建或升级工厂的成本可能会压倒市政当局，例如，温尼伯的三个工厂升级为BNR，预算为5亿美元，现在估计成本超过10亿美元。申请人组织了2005年在克拉科夫举行的IWA国际BNR会议和2006年在华盛顿举行的BNR处理限制研讨会，邀请了世界上最有成就的BNR专家提出解决这些问题的建议。基于他们的投入，并预期2007年加拿大第一个全面规模的污泥废液氮去除工厂在温尼伯北部完工（基于申请人的nserc资助的研究），建议研究：通过生物增强，缺氧胁迫和内部产生的可生物降解碳源加速在寒冷气候下的总氮去除-后者缓和由雨水和渗透引起的稀释。将开发一种去除膜基生物膜上总氮的工艺，进一步缩短所需的处理时间。将研究厌氧自养过程Anammox以及颗粒活性污泥过程-后者提供更容易的生物质分离和更小的池尺寸。这项工作将得到包括BNR“之父”J. Barnard博士在内的实践者的投入，他就这些想法进行了咨询，并将继续参与其中。温尼伯为快速应用产生的想法提供了潜力，因为该市迫切寻求更低预算和更小足迹的工厂升级解决方案。BNR流程和相关固体管理的任何改进都将减轻温尼伯和加拿大纳税人的经济负担。

Research will address a major problem facing all Canadian municipalities: how to economically upgrade the existing wastewater treatment processes to ever more stringent effluent quality in terms of lowering the nutrients content (nitrogen and phosphorus). Biological nutrient removal (BNR) offers the lowest cost treatment to avoid fertilization of receiving waters. In some cases limit-of-treatment effluent levels must now be met in existing, tight urban infrastructure. Treating cold, dilute wastewater in such conditions is difficult and leads to the costs of new or upgraded plants taht may overwhelme a municipality, e.g. the upgrade to BNR of Winnipeg's three plants, budgeted at $500 M, is now estimated to cost over $1 billion. Organizing the 2005 IWA International BNR conference in Krakow and the BNR Limit of Treatment Workshop in Washington in 2006, the Applicant has invited the world's most accomplished BNR experts to suggest solutions to these issues. Based on their input and in anticipation of the 2007 completion of Canada's first full scale sludge liquor nitrogen removal plant in Winnipeg-North (based on the Applicant's NSERC-funded research) it is proposed to investigate: acceleration of total nitrogen removal in cold climates through bio-augmentation, anoxic stress and internally generated sources of biodegradable carbon - the latter to moderate the dilution caused by storm-water and infiltration. A process removing total nitrogen on the membrane-based biofilm, further reducing the required treatment time will be developed. An anaerobic autotrophic process called Anammox will be investigated as well as granular activated sludge process - the latter offers easier biomass separation and smaller tank sizes. The work will receive the input from practitioners, including the "father" of BNR - Dr J. Barnard, who was consulted on the ideas and will continue to be involved. Winnipeg offers the potential for fast-track application of generated ideas as the City eagerly seeks lower budget and smaller footprint solutions to the plants' upgrade. Any improvement in the BNR process and associated solids management will decrease the financial burden to the Winnipeg and Canadian taxpayer.