A^(2)O工艺污水的荧光光谱区域积分法解析

Analysis of Fluorescence Spectrum of Wastewater Treated by A;O Process based on Area Integration Method

针对常见的A^(2)O污水处理厂进、出水以及各个处理单元中的污水开展常规水质指标、荧光特性及其相关性研究。污水经过厌氧-缺氧-好氧(A^(2)O),结合三级处理等全流程处理工艺后,COD的去除率达到了92.1%,BOD5去除率达到94.5%,TOC的去除率为86.9%。尽管出水水质均满足《城镇污水处理厂污染物排放标准》(GB18918-2002)中一级A标准,由于冬季进厂水的水质指标明显比夏季差,冬季出水水质略差于夏季出水。结合污水理化指标的相关性分析,应用三维荧光光谱,开展区域积分法可知,工艺在处理污水时对蛋白类物质的去除效果要优于腐殖质类物质,各区域标准体积积分与传统水质指标如COD、BOD5、氨氮以及总氮之间具有很好的相关性。研究结果可为水厂内部水质监测和控制提供技术支撑。

The conventional water quality index, fluorescence characteristics and their correlation were studied for the common A^(2) O wastewater treatment plant inlet and outlet as well as the wastewater in each treatment unit. After anaerobic-anoxic-aerobic(A^(2) O) combined with three-stage treatment, the removal rates of COD, BOD5 and TOC were 92.1 %, 94.5 % and 86.9 %, respectively;Although the effluent quality meets the first class a standard in the discharge standard of pollutants for urban sewage treatment plants(GB18918-2002), the quality of the water entering the plant in winter is obviously worse than that in summer, and the quality of the water leaving the plant in winter is slightly worse than that in summer. Combined with the correlation analysis of physicochemical indexes of sewage,three-dimensional fluorescence spectrum was used to carry out the regional integration method. The results show that the removal effect of protein substances in sewage treatment by the process is better than that of humus substances, and there is a good correlation between the regional standard volume integration and traditional water quality indexes such as cod, BOD5, ammonia nitrogen and total nitrogen. The results can provide technical support for water quality monitoring and control in waterworks.