The Comprehensive Evaluation Of Schemes For Treatment And Disposal Of Shale Gas Wastewater Based On Life Cycle Analysis

Shale gas as a new type of unconventional natural gas energy,the rapid rise of the worldwide has changed the pattern of global energy.Furthermore,in improving the mining of energy supply and promoting economic development,it plays an important role.As the main technology of shale gas exploitation,hydraulic fracturing technology implements of shale gas production at the same time exist great adverse impact on the environment.The complicated composition,the special nature and the difficulties to deal of fracturing wastewater generated in the hydraulic fracturing process,even become the main causes of shale gas restricted in many areas.Thus,Shale gas mining countries have developed different fracturing wastewater disposal technologies and solutions.However,at present about fracturing evaluation tend to focus on the treatment technology of wastewater disposal scheme measure of the advantages and disadvantages,especially for the analysis of the technical parameters of processing technology,economic investment,etc.There is no objective and comprehensive evaluation method about the process of the whole fracturing wastewater in China.Therefore,this article mainly studies fracturing wastewater disposal,the construction of the comprehensive evaluation system in wastewater disposal scheme and its application in the relevant evaluation method.Based on the life cycle assessment method and chromatography analysis theory,through literature review and field research methods,it summarizes current situation of sewage disposal of our country and the United States,and discussed the effects generated in the process of fracturing wastewater disposal using listing analysis tool.From environmental impact,economic impact,and technical performance,we selects 13 indexes and established a relatively perfect comprehensive evaluation index system to evaluate fracturing of wastewater disposal scheme.According to the established evaluation index system,by reference to the calculation of the comprehensive index method,we established the evaluation model to comprehensive benefit of fracturing wastewater disposal scheme.In addition,using the analytic hierarchy process,determine the weights of selected indicators by questionnaire.Five scale method is introduced determine the accuracy and rationality of the evaluation results,and the introduction of MATLAB software is greatly reduce the workload of calculation.As can be seen from the result of the weight of each index,environmental elements has the maximun impact on disposal scheme of comprehensive benefits,is 0.366,followed by economic factors,is 0.322,the technical performance has the minimum impact on the comprehensive benefit,is 0.311.To test the operability of assessment model,we based on the three different fracturing wastewater disposal scheme on research area as the research object,for instance analysis.Through calculation of Scheme A,B and C,the environmental impact evaluation are 0.363,0.301,0.065,the contribution of three kinds of disposal schemes to the environmental impact are different.At the same time,the application of comprehensive benefit evaluation model to calculate the comprehensive score of each disposal scheme,plan A score is 0.849,plan B score is 0.509,program C score of 0.212.According to the calculation results and measured values of different indicators,we analyzes the advantages and disadvantages of each scheme,and to research blocks fracturing wastewater disposal are proposed,such as the preferred scheme A as wastewater disposal scheme of the module,when the site can't meet the demand of processing or effluent disposal,we may consider to use plan B.We adopted the theory of life cycle assessment(LCA)and its listing analysis tools to analysis of the effects of fracturing waste water disposal scheme.When constructing evaluation model,we used the analytic hierarchy process(AHP)and comprehensive index method.Evaluation throughout the whole process of fracturing wastewater disposal.Established model has certain scientific applicability and provides shale gas enterprise decision-makers and the related department of environmental protection thoughts and methods to select and evaluate the fracturing wastewater disposal scheme.Through changing the parameters of assessment model,we applied it in the evaluation of different locations of fracturing wastewater disposal scheme.