| Ashe River locats in Heilongjiang Province, as an important tributary of the right bank of the Songhua River, Ashe River has received industrial wastewater and sewage in the rapid development of local economy and the water ecological environment of river has been completely damaged, which posed a serious threat to water quality of Songhua River.As a key control area, Ashi river-Acheng was carried out basin comprehensive environmental management, to improve Ashi river-Acheng water quality effectively.The goal of class IV water quality management will be achieved, to ensure the security of the Harbin city water environment, thereby the main stream of songhua river pollution load will be reduced and the water quality of songhua river also can be improved.It is a great significance to meet the need of people healthy.Firstly, the pollution situation of scattered point sources was invested in-depth, spatial and temporal variations of pollution was analyzed to determine the present situation of water environment of river.Point source pollution is the main cause of Ashe River pollution. There are many tributaries in the middle of Ashe River, such as Yuquan River, Nandagou,Chengnangou,HaigouRiver and Miaotaizigou. All of them received sewage and industrial waste water from city. So, we should view these tributaries as pollution outlet in order to carry on pollution control strategy research.Chengnangou, Nandagou, Miaotaizigou needto control seriously. Water quality data of Ashe River Acheng in the period of2006-2013were analyzed. Results show that each section water quality has improved since2009,DO is increasing, COD, NH3-N and CODMn were desearsing, mainly due to the operation of the sewage treatment plant,,the improvement of residents’ environmental awareness, the local government also made contribution to the environment.Second,based on one-dimensional water quality model and linearprogramming, the point source pollution reduction model with fuzzy multi-objective optimization has been established. To achieve cost effective and best water quality, for us to optimize the process, we set pollutant concentration and total amount control as constraints and put forward the optimal pollution reduction control strategy by simulating and optimizing water quality monitoring data from the target section. Integrated with scenario analysis, COD and ammonia nitrogen pollution optimization was study in objective function area from Mountain Maan of Acheng to Fuerjia Bridge along Ashe River. The results showed that COD and NH3-N contribution has been greatly reduced to Ashe River by37.23%and23.49%respectively. Finally, Based on one-dimensional water quality model and section-end control, the ideal and actual water environment capacity were recalculated dynamically on Ashi River-Achengregion, and the upstream water quality and the influence of tributaries were consided. On this basis,the optimal reducing discharge strategies could be obtained to reach the permitted standards.The average COD and NH3-N reductions of Zhujia-Achengxia functional areas in AshiRiver-Acheng were462.47t/a and5.2t/a respectively,Achengxia-Chenggaozi were required to cut282.42t/a and9.25t/a.Therefore, the general optimization framework about watershed discharge basedon dynamic water environmental capacity can make source sewage optimization fairly and reasonably,and the optimal strategies of pollution emission are presented. improving the Songhua River waterquality, and to provide scientific and technological support for the Songhua River. |
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