Comprehensive Evaluation Model Of Urban Sewage Treatment Plant

The construction and operation of municipal sewage treatment plant involved many factors, and the impact of the performance are important and far-reaching. In order to ensure the reasonableness of the choice program and the accuracy of the overall decision-making, to provide a reliable basis for the final determining, made all-around comprehensive evaluation on all the project is necessary.Making evaluation on urban sewage treatment plant is a complex and systematic project which is involved the social, economic and environmental aspects. Previous evaluations of the urban sewage treatment plant were preceded more from the economic benefits; there are one-sidedness that the other influence factors were neglected.This study selected 19 comprehensive evaluation indexes from 4 aspects of the social, economic, environmental, technical, and the quantization formula and standardized method of the most indexes. The weights of the various indexes are confirmed by AHP, and the comprehensive evaluation model of urban sewage treatment plant is established by using fuzzy comprehensive evaluation method, it is more reasonable and comprehensive than the single economic evaluation model.Firstly, on the base of summarized the comprehensive evaluation domestic of urban sewage treatment plant, the study analyzed the achievements and deficiencies of the current evaluation system, and it point out the development trend of the urban sewage treatment plant evaluation.Secondly, the study introduced the existing system evaluation method, in the precondition of nail down the aim of urban sewage treatment, according to the ideology of system analysis, the theory of fuzzy comprehensive evaluation is chose to be as the guiding ideology, combine with the actual conditions of municipal sewage treatment plant, it constructed an overall framework of urban sewage treatment plant which is composed by the social, economic, environmental, technical aspects.Thirdly, in the premise of familiar with the principles and methods of the index system, on the guidelines of the overall frame of evaluation system, the evaluation index system of the urban sewage treatment plant was established from the above 4 different aspects. The study also gives the analysis of the quantitative and qualitative indexes form the index System. On the basis of a wide range of data access, the study gives the scientific quantification of the quantifiable indexes, and gives a standardized method of evaluation indexes.Fourthly, on the foundation of the principle of systematic evaluation and the fact circumstances of urban sewage treatment plants, the study used AHP evaluation method to calculate the weight coefficient. Through the questionnaire, it educes the corresponding scaling list to three tables of the indexes. After analyzed, it educes the indexes weight coefficients form 4 aspects of 19 indexes. After the weight coefficient has been determined, according to fuzzy comprehensive evaluation, the urban sewage treatment plant comprehensive evaluation system was established.Fifthly, the circumstances of the water resources and water pollution in Kunming were brief introduced in this study, and the relevant data of existing 6 sewage treatment plants was put into the comprehensive evaluation model. The basic parameters of the Kunming six sewage treatment plants were standardized through the subjection function and subjective assignment, and the numerical value were put into the comprehensive evaluation model which contains 4 aspects 7 indexes, the result indicates that though the calculation of this evaluation model, the 3rd sewage treatment plant is the optimal, the 4th sewage treatment plant is the minimum. The research results can be a reference for the newly-built sewage treatment plant in the future.Finally, it summarizes the research results in conclusions part, and it also pointed out the content which is need for further research.Comparing with the present programs selection which is briefly according to the economic data used in urban sewage treatment plant feasibility analysis, the comprehensive evaluation model of urban sewage treatment plant established by analytic hierarchy process and fuzzy comprehensive evaluation technique can reflect the influence of each system factor to the whole body more objectively, and makes the evaluating results more scientifically and reasonably, provides preferable scientific accordance for the optimization and selection of source pollution control programs.