Cost-effective leachate treatment using aerobic granular sludge technology

垃圾渗滤液是由有机碳、氮化合物、溶解性固体和重金属组成的复杂废水。渗滤液的特性可能因填埋的废物、气候条件和填埋年龄而异。由于垃圾渗滤液的成分具有毒性和难降解性，因此在排放到环境中之前必须对其进行处理。目前迫切需要开发一种可靠的、节能的、具有成本效益的渗滤液处理工艺，既能处理高有机碳和高氨含量的渗滤液，又能承受渗滤液中重金属可能产生的毒性和抑制作用。在这个为期两年的项目中，刘博士在阿尔伯塔大学的研究小组将与埃德蒙顿市合作，开发和优化基于好氧颗粒污泥（AGS）的亚硝化/亚硝化/厌氧氨氧化处理工艺，以实现节能高效的高强度低浓度生活垃圾处理。 中试规模的生物反应器将进行操作和优化，以提高氨还原效率，提高能源效率，并减少对LLW处理的环境影响。重点将是确定LLW处理的最佳条件，并选择最有利于在生物反应器内开发强大微生物组的操作条件和控制策略。这些活动将使我们能够为未来全面实施基于AGS的LLW工艺提供指导。

Landfill leachate is complex wastewater composed of organic carbon, nitrogen compounds, dissolved solids, and heavy metals. Leachate characteristics may differ depending on the waste landfilled, climate conditions, and landfill age. Because of the toxic and recalcitrant nature of its constituents, landfill leachate wastewater (LLW) must be treated before being released to the environment. There is an urgent need to develop robust and energy and cost-efficient leachate treatment processes that can handle the high organic carbon and high ammonia loadings of leachate while being able to withstand the toxicity and inhibition that may arise due to the heavy metals of leachate.In this two-year project, Dr. Liu's research group at the University of Alberta will collaborate with the City of Edmonton, to develop and optimize aerobic granular sludge (AGS)-based nitritation/denitritation/anammox treatment processes for energy-efficient high-strength LLW treatment. Pilot-scale bioreactors will be operated and optimized for enhanced ammonia reduction efficiency, improved energy efficiency, and reduced environmental impacts for LLW treatment. The focus will be to determine the optimal conditions for LLW treatment and select the operation conditions and control strategies most favorable for developing a robust microbiome within bioreactors. These activities will enable us to provide guidance for future full-scale implementation of AGS-based LLW processes.