Study on the impact of the five water treatment action on water pollution load reduction in Yiwu River
WANG Cong1,2,, YANG Fan3,,, HUANG Zhenhua1,2, ZHENG Xiaoxu1,2, ZHANG Honggang1,4, WANG Dongsheng1,4, BAI Zhihui1,2, XU Shengjun1,4, ZHUANG Xuliang1,2 1.Reserch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Shenzhen Shenshui Water Resources Consulting Co., Ltd., Shenzhen 518003, China 4.Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, China
Abstract:This study evaluated the change in water quality of the Yiwu River Basin from 2014 to 2018 and the impact of the five water treatment action on the pollutant load reduction, and calculated the effects of upgrading wastewater treatment plants and conversion of farmland to forest and grassland on the reduction of pollution load from point and non-point sources. Suggestions are given for the next stage of point source and non-point source pollution load reduction. Results show that the water quality of the main stream of Yiwu River improved significantly from 2014 to 2018. The monthly average concentration of COD and total phosphorus steadily reached Class Ⅲ of the environmental quality standard for surface water, and the annual average concentration of ammonia was also lower than the limit of Class Ⅲ. Compared with the statistics in 2014, the point source loads of COD, ammonia nitrogen, total phosphorus and total nitrogen in 2018 were reduced by 1 601.0, 95.1, 26.3 and 272.5 t·a?1, respectively, with reduction rates of 33.6%, 59.9%, 41.5% and 14.3%, respectively. The pollution loads of non-point source COD, ammonia nitrogen, total phosphorus and total nitrogen were reduced by 1 998.5, 148.0, 367.1 and 33.7 t·a?1, respectively, with a reduction rate of 12.23%. The reduction of COD, ammonia nitrogen and total phosphorus was mainly contributed by the point source pollution control measures, while the reduction of total nitrogen was mainly contributed by the point source pollution control measures. In order to promote water environmental pollution control in Yiwu, it is suggested that the effluent quality requirements of sewage treatment plants should be carefully formulated that are suitable for local conditions, and the alternative low-cost ecological treatment mode should be chosen. It is also suggested to strengthen the ecological restoration of the river basin, make full use of various natural water bodies such as ponds, pools, reservoirs, streams, rivers and lakes, and build a blue-green space of the river basin with healthy water ecology as the main line. Key words:five water treatment/ water pollutant load reduction/ sewage treatment plant upgrade/ pollution control/ non-point source pollution.
图1义乌市水系分布图 Figure1.Distribution of water resources in Yiwu
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1.Reserch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Shenzhen Shenshui Water Resources Consulting Co., Ltd., Shenzhen 518003, China 4.Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, China Received Date: 2020-08-13 Accepted Date: 2021-03-10 Available Online: 2021-04-23 Keywords:five water treatment/ water pollutant load reduction/ sewage treatment plant upgrade/ pollution control/ non-point source pollution Abstract:This study evaluated the change in water quality of the Yiwu River Basin from 2014 to 2018 and the impact of the five water treatment action on the pollutant load reduction, and calculated the effects of upgrading wastewater treatment plants and conversion of farmland to forest and grassland on the reduction of pollution load from point and non-point sources. Suggestions are given for the next stage of point source and non-point source pollution load reduction. Results show that the water quality of the main stream of Yiwu River improved significantly from 2014 to 2018. The monthly average concentration of COD and total phosphorus steadily reached Class Ⅲ of the environmental quality standard for surface water, and the annual average concentration of ammonia was also lower than the limit of Class Ⅲ. Compared with the statistics in 2014, the point source loads of COD, ammonia nitrogen, total phosphorus and total nitrogen in 2018 were reduced by 1 601.0, 95.1, 26.3 and 272.5 t·a?1, respectively, with reduction rates of 33.6%, 59.9%, 41.5% and 14.3%, respectively. The pollution loads of non-point source COD, ammonia nitrogen, total phosphorus and total nitrogen were reduced by 1 998.5, 148.0, 367.1 and 33.7 t·a?1, respectively, with a reduction rate of 12.23%. The reduction of COD, ammonia nitrogen and total phosphorus was mainly contributed by the point source pollution control measures, while the reduction of total nitrogen was mainly contributed by the point source pollution control measures. In order to promote water environmental pollution control in Yiwu, it is suggested that the effluent quality requirements of sewage treatment plants should be carefully formulated that are suitable for local conditions, and the alternative low-cost ecological treatment mode should be chosen. It is also suggested to strengthen the ecological restoration of the river basin, make full use of various natural water bodies such as ponds, pools, reservoirs, streams, rivers and lakes, and build a blue-green space of the river basin with healthy water ecology as the main line.
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