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、气候条件和填埋年限而异。由于垃圾填埋场渗滤液的有毒和顽固性，垃圾填埋场渗滤液废水（LLW）必须经过处理才能排放到环境中。目前迫切需要开发强大的、能源和成本效益高的渗滤液处理工艺，既能处理渗滤液中的高有机碳和高氨负荷，又能承受因渗滤液中的重金属而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）的硝化/反硝化/厌氧氨氧化处理工艺，以实现节能高强度的LLW处理。中试规模的生物反应器将运行和优化，以提高氨还原效率，提高能源效率，并减少LLW处理对环境的影响。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发展强大微生物群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过程提供指导。

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.