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| Spatiotemporal trends in water quality and the effectiveness of water treatment projects for Wunan District, Changzhou |
| KANG Ruo-xi1, XIE Wen-li2, ZHAO Wen-xing1, PANG Xiao-si1, YU Gang1 |
1. Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China;
2. Changzhou Environmental Monitoring Center, Changzhou 213001, China |
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Abstract The aims of this study were to explore spatiotemporal differences in water quality of 4 main rivers (Taige River, Wuyi River, Wujin River and Yongan River) in Wunan District based on 2006~2018 water quality monitoring data, to identify the contributions of different activities on water quality parameters, to evaluate the effects of treatment projects on water quality, and to conduct seasonal and correlation analysis for the most heavily polluted river (i.e., Yongan River). The results showed that water quality of 4 rivers improved from 2006 to 2018, with the modified Nemerow index declining by 36.2%, 31.5%, 56.4% and 48.7%. Water quality of Yongan River deteriorated in 2017 due to dredging activities. The ammonia nitrogen (NH3-N) concentration, total nitrogen (TN) concentration and permanganate index significantly decreased year by year (P<0.05), but the total phosphorus (TP) concentrations fluctuated across the same period. The correlation analysis indicated that NH3-N, TN and permanganate index may stem from the same sources. NH3-N and TN exhibited an obvious seasonal variation, but no clear trend was observed for TP and permanganate index. Overall, increased urbanization, decreased traditional industry, and decreased agricultural activity had positive effects on improving water quality in Wunan District.
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Received: 25 March 2019
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