Open AccessAssessment of wastewater on-line monitoring system in an important industrial park in Tianjin, China
Author(s) -
Guangxun Liu,
Yanli Zhi,
Weinan Xu,
Yang Yu
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/349/1/012031
Subject(s) - wastewater , chemical oxygen demand , environmental science , pollutant , biochemical oxygen demand , monitoring and control , ammonia , chlorine , environmental engineering , engineering , chemistry , organic chemistry , control engineering
Chemical oxygen demand and ammonia nitrogen were key water pollutants under state control, and key factories were required to conduct online monitoring. In order to evaluate the accuracy of the online instrument, the online equipment comparison monitoring of 20 key factories in 8 industries was conducted for 4 years. The wastewater of factories in the same industry has similar contaminant discharge concentration. The mean value of relative error absolute value was below 20% for medium and high concentration of chemical oxygen demand (above 30 mg/L) and ammonia nitrogen (above 1 mg/L) in water samples. For high chlorine concentration and coloured water samples, the online monitoring error was large, so the method needs to be improved.