A／A／O工艺全流程节能途径与对策

A／A／O工艺因其较好的除磷脱氮效果而广泛应用于城市污水处理之中。但是目前工艺设计主要是基于负荷稳定条件下的经验参数确定，往往趋于保守，因此造成了能耗的浪费。文章从A／A/O工艺的特点出发．研究了全流程的水力损失，从而提出了进水提升泵设计的优化方案。其次，针对耗能最大的鼓风机单元，提出了溶解氧和出水氨氮的精确控制节能方案。最后从二沉池优化运行的角度从发，利用状态点分析法，提出了外回流节能的措施。

Strategy and Approach for Energy Saving in Total Procedure of A/A/O Wastewater Treatment Processes

A/A/O process is applied widely in municipal wastewater treatment plants, which attribute to its good performance for nutrient removal. However, the design parameter of A/A/O process is mainly from experiences based on stable flow rate. So the design parameter is greater than requirement in fact, which contributes to energy waste. In this study, based on the characteristic of A/A/O process the hydraulic loss of whole flow line was investigated, and the design of lifting pump station was optimized firstly. Secondly, the accuracy control scheme for dissolved oxygen and effluent ammonia nitrogen was proposed to save energy of centrifugal blowers, which is the greatest proportion of energy consumption. At last, the energy consumption for returning activated sludge flow was decreased with the state point analysis, which improved the operation of secondary sedimentation tank at the same time.