Study Of Security Appraisal In Sewage Agricultural Irrigation

With the aggravation of water resource shortage and pollution in our country, the lack of water in agricultural irrigation has hindered the development of the agricultural. In order to meet the increasing demand of agricultural, utilize sewage agricultural irrigation is the inavoidable trend . Because of the composition complication,and of the high concentration pollutant in the sewage, they have been harmful to agriculture, the close attention should be taken to the security of agricultural production too while solving agricultural irrigation water, the paper rely on the National tackling of key scientific andtechnical problems------ one sub subject of the safe of water resource and the sustainableutilization mode studying(Serial number of the project:2002BA901A37)------ Recycletreatment project of the waste water,and takes irrigated area sewage irrigation security in Shihezi of Xinjiang as the target, the factors of the security in the sewage irrigation have been studied, and the safety standard of the factors in various fields, and application to the actual project has been promoted.At first, through analyse the influence on the soil, crops , groundwater and function of water body of sewage , the index system of sewage irrigation security appraisal have been set up. Sewage field irrigation security appraisal is more than one index comprehensive appraisal course, the prerequisite on comprehensive appraisal of many indexes is to confirm the scientific evaluation index system. this text is according to the Principle of establishing the overall target system, and utilize the most basic and frequently used analytic approach of constructing the synthetical target system to make sewage irrigation security evaluation index system goal divide several son of different component or different side tie Interconnected system, and subdivide and form the sub subsystems at all levels and function module progressively , until every part and side can be described, and realized with the concrete statistics index. The course set up to the index system of this text has been explained . The first step, ,the problems assessed which are explained and total goal and sub goal appraised . Our total goal is that sewage field irrigation security is implicit and the epitaxy utilize sewages to irrigate a series of security questions produced . The sewage field irrigation security shows concretly: Soil , crops , groundwater and water body function security . Second, Four respects of this text to sewage field irrigation security have been resolved further . Sewage irrigation soil securitydisplay in the factors of poison soil and influence soil physics and chemistry performance and fertility; Sewage irrigation crops security display in the factors of crops accumulating pollutant and hindering crop from grow two. Sewage irrigation groundwater security display in the factors of poison function to people or animal, groundwater routine physics and chemistry index , biological pollution , radioactive pollution. The water body function security of sewage irrigation is displayed in the factors of routine physics and chemistry index , poison three respects of the index and microorganism's factor. A lot of concrete factors to be divided can be displayed as to the sub and sub goals appraised of these every above factors.Secondly , the weight is calculated through utilizing AHP(Analytic Hierarchy process) level analytic approach and combining the influence of each index to the superior goal and getting related with other index. Judging the mathematics model of sewage agricultural irrigation security appraisal have been proposed according to the ration of the index system. This mathematics model belong to multistage model of appraising, we adopt comprehensive factor appraise method, and fully consider the weights of each pollution index and every stature goal. After appraise mathematics model we confirm every evaluation criterion of index according to every stature goal which has been set up.Finally, according to the concrete conditions of irrigated area sewage irrigation in Shihezi of Xinjiang , and on the basis of collecting and investigating data, Theconcrete analysis and appraisal concerning the safe state of agricultural irrigation of sewage of Shihezi of Xinjiang in recent years have been made out through the judging model of fuzzily synthetically appraisal and synthesis pollution index.The result of using the two models to appraise had been appraised,and the method of fuzzily synthetically appraisal is adapt to the proposition.