Study On Water Environmental Quality Assessment Before And After Comprehensive Treatment And Ecological Engineering Remediation Of The Lake Bosten

Lake resources are important water resources,is an important factor in the survival and development of human beings.As Xinjiang Bosten Lake is important freshwater resources of Bazhou,has extremely important significance to the development of Bosten Lake area economy and the society.In recent years,the lake water was it is often seen.serious pollution cases,Bosten Lake is no exception with the global.Lake pollution,attracted worldwide research on lakes methods,lakes research methods get fast development,and achieved some consensus of experience and achievements,at the same time our country on lake pollution and proposed many policies,measures and programs.Xinjiang Bazhou has implemented a number of investment projects of central government to treat the pollution of Bosten Lake,along with the implementation of various regions of lake pollution control projects,to evaluate the water environment quality situation is particularly important,both at home and abroad on the water there are many methods to evaluate the environmental quality,the theory and method have been more mature,but they still need to be put into practice explored and improved.According to the comprehensive management of Bosten Lake and ecological restoration project,to evaluate the water quality before and after the project,select several representative and common uesd methods,by uesing single factor evaluation,the Nemero index method,modified Nemero index method,grey relational analysis and matter-element method to evaluate of 6 indexes CODMn?CODCr?BOD5?NH3-N,TP?TN of 2008?2009?2010?2012?2013 years of Bosten Lake 14 points evaluation,analysis of project evaluation results,the main pollutant removal of various pollutants,the difference between the evaluation results of different evaluation methods,the improvement project on water quality.Through the evaluation of the project before and after water the environmental quality,the results are as follows:(1)Use the single factor evaluation showed that: the main pollutants in Bosten Lake is COD,compared before and after the project TP,TN concentration decreased,basically meet the engineering n,t removal purposes,1,2,3,5,7,9,11,14 point exceededthe excessive number of pollutants exceeded,basically reached the goal of pollution control engineering;(2)Using the modified Nemero index method and grey correlation analysis method of water quality evaluation results showed that: after a year of engineering quality evaluation grade is higher and the improved Nemero index method in3,4,5,6,7,8,9,13 points are class II water standards,10 point as a class I water standard,the grey correlation analysis method in 2,3,4,5,6,7,8,9,10,11,12,13 are class II water standards,1,14 points are class I standard,two evaluation methods are higher than the results of class III water quality standard of Bosten Lake requirements.The traditional Nemero index method and matter-element analysis on water environmental quality in the evaluation results showed that: after the project the highest evaluation results for the class III water standard,but reached the class III water standard point had increased;(3)Use traditional Nemero index method,the modified Nemero index method,grey correlation analysis method,matter-element to analysis of 4 evaluation methods of Bosten Lake before and after the 14 points of engineering water environmental quality evaluation results showed that after 7,11 engineering point of water environmental quality improvement effection is the most obvious.(4)From the 5 kinds of evaluation methods of water quality assessment results,the improved Nemero index method of project evaluation results evaluation of the highest level,followed by the matter-element analysis,the grey correlation analysis method,the Nemero index method,the last is the single factor evaluation method.