Low energy ammonia reduction from ammonia-rich sludge thickening lagoon supernatant in Canada: Pilot-scale demonstration

城市污水一般含有过量的营养物质(氮和磷)，如果排放时没有进行足够的处理，可能会导致接收水体的富营养化。城市污水处理厂产生的污泥(一次和二次)处理产生的消化污泥液含有高浓度的氨，对水生生物有害，需要进一步处理。传统的硝化/反硝化工艺对曝气的要求很高，是一种耗能较高的工艺。新的工艺正在出现，如亚硝化/反硝化和亚硝化/厌氧氨氧化(厌氧氨氧化)工艺，但关于这些工艺全面实施的信息有限，特别是在加拿大寒冷条件下的操作。刘的团队与EPCOR水务公司合作，探索了在加拿大寒冷的条件下采用亚硝化/反硝化和亚硝化/厌氧氨氧化工艺，在加拿大寒冷的条件下降低富氨污泥液中的氨含量的策略，并取得了良好的氨还原效率。但是，有必要在试点规模进一步研究这两个进程，以便今后进行全面的进程选择和评估，以满足东太平洋伙伴关系的需要。因此，这里建议继续之前的实验室规模的研究。在这项研究中，我们建议采用中试规模的亚硝化/反硝化和亚硝化/厌氧氨氧化工艺来评估富氨污泥液处理的运行和控制策略。这一目标将通过多学科研究来实现，这些研究结合了艾伯塔大学在废水处理、生物膜微生物学和生物反应器开发方面的专业知识，以及EPCOR的全尺寸生物反应器设计和操作。将运行和优化中试规模的亚硝化/反硝化和亚硝化/厌氧氨氧化反应器。从这项研究中获得的业务控制战略将为进一步全面实施提供指导。

Municipal wastewater generally contains excessive nutrients (nitrogen and phosphorus), which when discharged without sufficient treatment can cause eutrophication in the receiving water bodies. Digested sludge liquor, the produce water generated from the treatment of sludge (primary and secondary) that is produced from municipal wastewater treatment plant contains high concentrations of ammonia that is toxic to aquatic biota and requires further treatment. The conventional nitrification/denitrification process is energy intensive due to its significant requirement for aeration. Newer processes, such as the nitritation/denitritation and nitritation/anammox (anaerobic ammonium oxidation) processes require low oxygen demand are emerging, but information on the implementation of these processes at the full-scale is limited, especially for operations under cold Canadian conditions. In collaboration with EPCOR Water Services Inc., Liu's group has explored the strategies to adopt the nitritation/denitritation and nitritation/anammox processes using lab-scale reactors to reduce the ammonia content in the ammonia-rich sludge liquor under the cold Canadian conditions, and achieved excellent ammonia reduction efficiency. However, further study of both processes at the pilot-scale is necessary for future full-scale process selection and evaluation to meet EPCOR's needs. As such, a continuation of the previous lab-scale study is proposed here. In this study, we propose to employ the nitritation/denitritation and nitritation/anammox processes at the pilot-scale to estimate the operation and control strategies for ammonia-rich sludge liquor treatment. This objective will be achieved through multidisciplinary studies combining expertise in wastewater treatment, biofilm microbiology, and bioreactor development from the University of Alberta, and full-scale bioreactor design and operation from EPCOR. Pilot-scale nitritation/denitritation and nitritation/anammox reactors will be operated and optimized. Operational control strategies obtained from this study will be used to provide guidance for further full-scale implementation.