ABSTRACT

Centralized wastewater treatment plants remove nutrients prior to discharge. Recently, technologies have become available to manage nutrients at different scales (individual buildings, neighborhoods/communities, or large centralized plants). Nutrient-recovery technologies applied upstream of the centralized treatment plant may affect both the wastewater flow rates and the nutrient fluxes reaching the plant. This study evaluates how the introduction of such upstream technologies affects the treatment efficiency and economics of nutrient management across a sewershed. Employing treatment technologies upstream from the centralized plant that receives highly loaded municipal wastewater could reduce nitrogen loading to the mainstream treatment train by over 50%, which generally reduces treatment plant effluent concentrations and saves money. In extreme cases, excessive upstream removal of nutrients can negatively affect biological treatment processes at the centralized treatment plant. Treatment of sidestreams at the centralized plant would likely be effective in reducing phosphorus loading, but not nitrogen loading, to the mainstream process.

摘要

集中式污水处理厂在排放前去除养分。最近，可以使用技术来管理不同规模（单个建筑物、社区/社区或大型集中工厂）的养分。在集中处理厂上游应用的养分回收技术可能会影响废水流速和到达工厂的养分通量。本研究评估了此类上游技术的引入如何影响整个下水道养分管理的处理效率和经济性。在接收高负荷城市污水的集中式工厂上游采用处理技术，可以将主流处理系统的氮负荷降低 50% 以上，这通常可以降低处理厂出水浓度并节省资金。在极端情况下，上游过多的营养物质去除会对集中处理厂的生物处理过程产生负面影响。在集中工厂处理侧流可能有效减少主流工艺的磷负荷，但不能有效减少氮负荷。