Study On Anglicizing The Urban Output-discharge Wastewater Of Poyang Lakeside And Its Effect On Water Quality Of Poyang Lake

Poyang Lake is the first big freshwater lake of china. Our country and many expertshave been paid attention on the protection of the water environment. They have carriedout like Poyang Lake water pollution investigation and scientific research project. Mypaper based on the second investigating of Poyang Lake, Taking Poyang Lake Districttown sewage angle for the starting point of the water quality change from1986to2010.Main conclusions are as follows:(1) My paper have been finished the theoretical calculation of the Poyang lakesidearea amount of urban sewage emissions to Poyang Lake. It has503838.02104tons ofurban sewage to Poyang lake since the7th to the11th five-year plan period, andenvironmental emissions of pollutant COD is986753.38tons, ammonia nitrogen is126098.56tons, the total phosphorus is12668.93tons, the total nitrogen is149976.30tons.(2) My paper calculates the Poyang lakeside area13counties and cities’ urbansewage emissions contribution rate to the environment of Poyang lake water. Calculationresults show that the Poyang lakeside area in Nanchang region contributed most urbansewage to Poyang Lake water, Xingzi County is the least to the Poyang lake waterenvironment. the contribution rate of Poyang lakeside area13counties and cities’ urbansewage emissions to the environment of Poyang lake water is: Nanchang﹥Jiujiang﹥Poyang county﹥Jinxian county﹥Yugan county﹥Yongxiu county﹥Duchangcounty﹥Dean county﹥Jiujiang county﹥Hukou county﹥Xingzi county.(3) According to the sewage water quality conditions data of Poyang Lake from7thto the11th five-year plan period, through the improved water quality evaluation indexmethod, fuzzy comprehensive evaluation method and the correlation of trophic stateindex method, Poyang Lake water quality was evaluated. The improved water qualityevaluation index method evaluation results show that the water quality of Poyang Lakesince the7th five-year plan period has been below the poor level; Fuzzy comprehensiveevaluation method results shows that water quality of Poyang lake in class Ⅱ in the7thfive-year plan period, all other periods in the class Ⅳ or below class Ⅳ, Comparedwith10th five-year plan period, Poyang Lake water has been improved since11thfive-year plan period; Correlation nutrition state index method results show that the waterquality of Poyang Lake had been in the moderate nutrition level which not reach theeutrophication degree from the7th to the9th five-year plan period, However, the qualityPoyang Lake water in a mild degree of nutrition since the10th five-year plan period, andit has reached the degree of eutrophication.(4) According to the environment of lakeside area urban wastewater pollutantemissions and improved water quality evaluation index method (WQI), relevant weighted comprehensive nutrition state index method TLI (∑) set up mathematicalmodel respectively by SPSS. The models’ correlations are higher. By urban sewageenvironment pollutants emissions and the WQI value model, the urban sewage pollutantsthat emissions from lakeside area where water have been maintain in good level hasforecasted, and suggestions which of the total amount of urban reduction has been putforward according to the predictive value and the contribution rate of Poyang lakesidearea13counties and cities’ urban sewage emissions to the environment of Poyang Lakewater; Using forecasted environmental urban sewage emissions amount and theestablishment of the relevant weighted comprehensive nutrition state index method TLI(∑) model which relate to lake urban wastewater environmental pollutants emissions, topredict the Poyang lake water quality at this time, The prediction results show that thePoyang Lake water quality in the moderate nutrition level when Poyang Lake waterquality is still good.