生物法是目前城市污水中氮的主要脱除方法，但我国城市污水普遍存在碳源不足的问题。本课题旨在研究污水中不同形态有机物在生物脱氮系统中实现梯级利用的有机物分配模式及其机理，探讨利用活性污泥的絮凝吸附作用对污水中颗粒态有机物和溶解性有机物进行有效分离，并采用超声、水解酸化等措施强化颗粒态有机物转变为可作为反硝化碳源的溶解性有机物的新方法，在物质流分析的基础上，深入研究污水中有机物优先用作反硝化碳源的分配调控机制，以提高污水生物脱氮系统出水水质并降低污水处理成本。主要研究内容包括：(1)污水中有机物形态分析及颗粒态有机物强化水解酸化过程研究；(2)颗粒态有机物水解反应器运行策略及水解酸化产物形态分析；(3)污水中有机物梯级利用反硝化系统构建及过程优化；(4)不同运行策略下反应器内微生物群落结构及演替变化研究；(5)有机物在生物脱氮系统中分配模式的模型建立及优化。研究成果能够为解决我国普遍存在的污水脱

Nitrogen is mainly removed by biological aerobic/anoxic process for municipal sewage treatment. However, the lack of carbon source in municipal sewage limits the denitrification process and results in a low removal efficiency of total nitrogen. Thus, in this study, a new gradient utilization process of the different forms of the organic matters in wastewater during the biological nitrogen removal process will be developed and discussed. First, the particulate organic matters and dissolved organic matters will be flocculated /adsorbed by activated sludge, and then these Nitrogen is mainly removed by biological aerobic/anoxic process for municipal sewage treatment. However, the lack of carbon source in municipal sewage limits the denitrification process and results in a low removal efficiency of total nitrogen. Thus, in this study, a new gradient utilization process of the different forms of the organic matters in wastewater during the biological nitrogen removal process will be developed and discussed. First, the particulate organic matters and dissolved organic matters will be flocculated/adsorbed by activated sludge, and then these particulate organic matters are converted to dissolve organic matters for denitrification by ultrasound or hydrolysis acidification techniques. The effects of process parameters will be studied and the mechanisms of gradient utilization of organic matters will be discussed. Based on the analysis of the mass flow of organic matters, the regulatory mechanism of the priority utilization of organic matters in wastewater as the carbon source during denitrafication will be in-depth studied to improve the nitrogen removal efficiency and reduce the cost particulate organic matters are converted to dissolve organic matters for denitrification by ultrasound or hydrolysis acidification techniques. The effects of process parameters will be studied and the mechanisms of gradient utilization of organic matters will be discussed. Based on the analysis of the mass flow of organic matters, the regulatory mechanism of the priority utilization of organic matters in wastewater as the carbon source during denitrafication will be in-depth studied to improve the nitrogen removal efficiency and reduce the cost of wastewater treatment. The research topics include: (1) the hydrolysis acidification process of particulate organic matters; (2) the design of hydrolysis acidification reactor and species analysis of the hydrolysis acidification products; (3) the development of a continuous flow reactor for biological nitrogen removal researching; (4) the relationship between the dynamic changes of the microbial communities structure and the reactor performances; (5) the optimization of distribution mode of organic matters in the biological nitrogen removal system. The results of this study will provide a new technology and scientific basis to solve the widespread problem in China ? the lack of carbon source in municipal sewage for denitrification.