ZHOU Yi-xin,WANG Yue-hong,JIANG Dan-ping,et al.Comparison of Three Detection Methods for Free Residual Chlorine in the Effluent of Urban Sewage Treatment Plant[J].China Water & Wastewater,2021,37(18 18):148.
Comparison of Three Detection Methods for Free Residual Chlorine in the Effluent of Urban Sewage Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
18 18
Page:
148
Column:
Date of publication:
2021-09-17
- Abstract:
- Due to the complexity of the influent, the detection of residual chlorine in effluent of urban sewage treatment plant is easy to be disturbed by impurities or improper detection method, which leads to instability of the detection results. In view of the above problems, free residual chlorine in the effluent of a sewage treatment plant was detected by spectrophotometric method, titration method and field instrument method, and the applicability of the three methods to water samples was compared. It was found that the test results of spectrophotometric method were significantly higher than those of field instrument and titration methods. Reaction time, linear range, experimental steps and operational details of spectrophotometric method were explored, and it was found that the upper limit of the method was 1.50 mg/L. For standard solutions, colorimetry could be completed within 60 minutes as described in the standard. However, colorimetric analysis could be completed near 60 minutes for complex samples such as effluent from sewage treatment plants, and the results might be higher. Therefore, it was suggested that reaction time should be determined according to the characteristics of the sample.
Last Update:
2021-09-17