重铬酸钾法对城镇污水处理厂污水中COD的测定

Determination of COD in Sewage from Urban Sewage Treatment Plant by Potassium Dichromate Method

对于城镇污水处理厂污水COD的测定,我国规定使用重铬酸盐法,并于2017年5月1日开始实施《水质化学需氧量的测定重铬酸盐法》(HJ 828—2017)。本文简要分析了新旧国标法中的修订情况,结合本课题组使用重铬酸钾法测定废水处理中COD含量的实验操作情况,重点阐述重铬酸钾法基本原理及具体测定方法,并总结出该方法在测量过程中的重要影响因素以及解决措施。

For the determination of COD in sewage from urban sewage treatment plants,China has stipulated the use of dichromate method,and on May 1,2017,the dichromate method for the determination of chemical oxygen demand in water quality(HJ 828—2017)was implemented.This paper briefly analyzes the revision of the old and new national standard methods,and combined with the experimental operation of our research group using potassium dichromate method to determine COD content in wastewater treatment,focuses on the basic principle and specific determination method of potassium dichromate method,and summarizes the important influencing factors and solutions of this method in the measurement process.