某酶制剂厂废水处理系统的工艺调控与运行优化

Process Control and Operation Optimization of Wastewater Treatment System in an Enzyme Preparations Factory

针对某酶制剂厂废水处理系统存在的问题,采用在线氨氮浓度表征生物处理系统中有机物的降解程度,根据生物反应罐内的在线氨氮浓度设定溶解氧浓度,以此控制供风量,并采用三阶段控制方法。当有机物降解较彻底时,采用同步硝化反硝化工艺;随着有机物降解效果变差,提高溶解氧浓度的设定值;当有机物的降解效果较差时,采用完全好氧工艺。实际运行效果证明,该控制方法抗冲击负荷能力强,与原来的间歇曝气方法相比,对COD和氨氮的去除效果并没有下降,而且还明显改善了对硝酸盐氮和总氮的去除效果,污泥SV值有一定的降低,同时,该控制方法在运行过程中有效节约了14.45%的供风量,降低了运行成本。

Aimed at the problems of the wastewater treatment system in an enzyme preparations factory, a new operation and control method was brought up. In the control, online ammonia nitrogen concentration was used to indicate the organic matter degradation degree in bioreactor and set DO concentration. Air was supplied by this means. The control was divided into three phases. The simultaneous nitrification and denitrification process was adopted when organic matter was degraded very well, DO concentration set-point increased when the organic matter degradation degree became poor, and the aerobic process was adopted when organic matter was degraded poorly. The actual operation showed that the control method had high resistance to shock loading, the removal of COD and ammonia nitrogen maintained the original level of intermittent aeration, the removal rates of nitrate and total nitrogen increased significantly, and SV of activated sludge decreased slightly. Besides, the air consumption was decreased by 14.45% , leading operation cost savings.