A cost-effective sustainable wastewater treatment technology for ammonia-rich sludge thickening lagoon supernatant treatment

由于城市污水通常含有过量的营养物质（氮和磷），将未经充分处理的城市污水排放到自然水体中会导致接收水体富营养化。在加拿大，城市污水处理厂产生的污泥一般通过厌氧消化处理，以稳定污泥，减少污泥体积和回收能量。通过脱水过程从固体中分离出来的消化污泥液通常含有高浓度的氨，需要进一步处理以降低氨含量。这个为期三年的项目旨在开发一种基于好氧颗粒污泥（AGS）的单反应器硝化/反硝化和单反应器硝化/厌氧氨氧化工艺，用于从富氨污泥液中还原氮。利用实验室和中试规模的生物反应器对AGS技术的操作和控制策略进行评估和优化。Liu的实验室开发的生化和分子工具将被应用于推进微生物颗粒污泥在各种操作和控制条件下的物理化学和生物特性和活性的知识。这些活动将使我们能够评估生物降解机制，并为未来的全面实施提供指导。

Discharge of insufficiently treated municipal wastewater into the natural water bodies can cause eutrophication in the receiving water bodies because municipal wastewater generally contains excessive nutrients (nitrogen and phosphorus). In Canada, sludge generated from municipal wastewater treatment plants is generally treated via anaerobic digestion to stabilize the sludge, reduce the sludge volume and to recover energy. Digested sludge liquor separated from the solids through the dewatering processes commonly contains high concentrations of ammonia, and requires further treatment to reduce the ammonia content.This three-year project aims to develop a cost-efficient and robust aerobic granular sludge (AGS) based single-reactor nitritation/denitritation and single-reactor nitritation/anammox processes for the nitrogen reduction from ammonia-rich sludge liquor. The operation and control strategies of the AGS technology will be evaluated and optimized using both laboratory- and pilot-scale bioreactors. The biochemical and molecular tools developed in Liu's laboratories will be applied to advance the knowledge of physicochemical and biological properties and activities of the microbial granular sludge under various operation and control conditions. These activities will enable us to evaluate biodegradation mechanisms and provide guidance for future full-scale implementation.