菌丝球诱导AGS体系界面过程机制及强化脱氮调控策略

我国城镇污水厂普遍存在低进水C/N比导致的出水TN难以达标或高运行成本的问题，随着出水排放标准日趋严格，开发经济、高效的污水生物脱氮技术成为迫切需求。本研究围绕强化低C/N比城镇污水好氧脱氮的效能，运用“层层自组装”技术形成功能菌强化菌丝球，以此为诱导骨架强化好氧颗粒污泥（AGS）的快速培养、稳定性及脱氮效能。探讨菌丝球固定功能菌的界面效应及过程优化，解析功能菌强化菌丝球诱导AGS体系的界面过程机制，及同步去除C/N的微生物生理生态学调控机制，进行AGS快速培养及稳定运行的过程优化；在此基础上，优化AGS体系处理实际城镇污水强化脱氮的运行参数，建立C、N降解动力学模型及AGS生长动力学模型，形成AGS系统处理低C/N比城镇污水稳定、高效运行的调控策略。本研究可为生物强化脱氮AGS技术的设计和稳定运行提供强有力的理论指导和技术支撑，对推动AGS技术在城镇污水处理领域的应用具有重要的意义。

Due to low carbon/nitrogen ratio (C/N) of influent, there exist technology difficulties or high operational cost for TN treatment to meet the effluent TN standard in urban sewage plants in China. With the increasingly stringent discharge standards, it is urgent to develop an economical and efficient biological nitrogen removal technology for urban sewage treatment. In this study, focusing on the enhancement of aerobic denitrification efficiency under the condition of low C/N ratio in urban sewage treatment, mycelial pellets loaded with different functional bacteria is used as induction nucleus to improve sludge granulation, stability and aerobic denitrification efficiency of multi-functional aerobic granular sludge (AGS) system. The "layer by layer self-assembly" technology is used for the immobilization of flocculent bacteria, nitrifying bacteria and aerobic denitrifying bacteria on the mycelial pellets. In order to optimize the rapid culture and stable operation of AGS, the interface effect and process optimization of functional bacteria immobilization on the mycelial pellets are discussed. And the interface process mechanisms and the physiological and ecological regulation mechanism of simultaneous removal of C/N in the AGS system induced by functional bacteria enhanced mycelial pellets are investigated. Based on above research, the operational parameters of AGS system are optimized for the enhanced nitrogen removal of practical urban sewage treatment, and the degradation kinetics models of C and N and the growth kinetic models of AGS are established. The control strategies are thus developed for the stable and efficient operation of enhanced nitrogen removal in the treatment of low C/N urban sewage. As a result, the implementation of this project can provide theoretical guidance and technical support for the design and stable operation of the AGS system with bio-enhanced nitrogen removal. And it is of great significance to promote the application of AGS technology in urban sewage treatment.