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

城市污水通常含有过量的营养物质（氮和磷），如果不进行充分处理，则会导致接收水体富营养化。消化污泥液，即城市污水处理厂产生的污泥（一级和二级）处理产生的生产水，其中含有高浓度的氨，对水生生物群有毒，需要进一步处理。传统的硝化/反硝化工艺由于对曝气的要求很高，是能源密集型工艺。新的工艺，如硝化/反硝化和硝化/厌氧氨氧化（厌氧氨氧化）工艺需要低氧需求，正在出现，但在全面实施这些工艺的信息是有限的，特别是在寒冷的加拿大条件下的操作。与EPCOR Water Services Inc.合作，探索了在加拿大寒冷条件下，利用实验室规模的反应器采用硝化/反硝化和硝化/厌氧氨氧化工艺降低富氨污泥液中氨含量的策略，并取得了优异的氨还原效率。然而，为了满足EPCOR的需求，在中试规模上对这两种工艺进行进一步的研究是必要的。因此，这里建议继续以前的实验室规模的研究。在本研究中，我们建议在中试规模上采用硝化/反硝化和硝化/厌氧氨氧化工艺来评估富氨污泥液处理的操作和控制策略。这一目标将通过多学科研究，结合阿尔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运行来实现。运行和优化中试硝化/反硝化和硝化/厌氧氨氧化反应器。从本研究中获得的操作控制策略将用于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.