Evaluation of water quality before and after treatment at Gongye River and Xiaozhai River in Shanghai

doi:10.3969/j.issn.1000-5641.2019.04.016

Abstract

Abstract: The water quality of Gongye River and Xiaozhai River in Putuo District of Shanghai before and after treatment were evaluated in this study. Single factor trend of dissolved oxygen, turbidity, nitrate nitrogen, chlorophyl a, and population density of zooplankton in these two rivers were analyzed; in addition, grey correlation analysis was conducted with total phosphorus, ammonia nitrogen, permanganate index, chemical oxygen demand, and five-day biochemical oxygen demand. The results showed no obvious changes in dissolved oxygen and turbidity before and after treatment. The concentration of nitrate nitrogen decreased initially after treatment. The concentration of nitrate nitrogen decreased initially after treatment, but increased thereafter, meanwhile, the concentration of chlorophyl a rose significantly after treatment. There's an increase in both species and densities of zooplankton with treatment. The grey relational analysis indicated that the water quality of the two rivers was close to Class V before treatment, reached Class I in the short term directly after treatment, and eventually stabilized at Class IV.

Key words: river regulation, water quality evaluation, grey relation

CLC Number:

X824

LU Xin-yu, YANG Yin-chuan, XIAO Bing, HUANG Min-sheng, LI Xin-ran, YIN Chao, CAO Cheng-jin. Evaluation of water quality before and after treatment at Gongye River and Xiaozhai River in Shanghai[J]. Journal of East China Normal University(Natural Sc, 2019, 2019(4): 165-173.

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