Open AccessComprehensive Evaluation of Water Environment Under “Zero direct discharge of sewage” Project
Author(s) -
Fang Zhangbin
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/643/1/012131
Subject(s) - water quality , environmental science , pollutant , pollution , sewage , drainage , environmental engineering , evaluation methods , engineering , chemistry , reliability engineering , ecology , organic chemistry , biology
This paper takes Yuhuan City as the research object, based on the single factor evaluation method, Nemero index method and gray relevance analysis method, selects three indexes of ammonia nitrogen, total phosphorus and permanganate index. By analyzing the main pollutants, the reduction of each pollutant and the differences between different evaluation methods, the effectiveness of water environment governance is evaluated, and then targeted regulatory measures are proposed to further improve water environment. The results show that the main pollutants in Lupu Town, Yuhuan City are NH 3 -N and TP. The single factor evaluation method and the Nemero pollution index method showed that the water quality categories are mostly type III and type IV. The evaluation results of the gray correlation analysis method are mostly Class II water, and all three methods indicate that most of the sites before the construction meet the Class IV water standard. During the construction process, the single factor evaluation method and the Nemero pollution index method show improvement in water quality, while the grey correlation analysis method showed little change in water quality categories. According to the various indicators and water quality changes, it can be seen that the effect of the zero-drainage project is significant for the improvement of river water quality.