| There are a lot of process schemes would be selected for urban wastewater treatment along with improving of wastewater treatment technology. selection of the favourable process scheme is one of most important stages in the construct of urban wastewater treatment plant,which decides investment cost, running cost, effluent quality, operation supervision and so on.In the fact, because of no forming a complete set of evaluation method,cost of budget estimate and subjective know of designer are crucial factors of election of process scheme in the feasibility study of our country.By inducting Analytic Hierarchy Process(AHP), definition of weight, an optimized evaluation model of planning of urban wastewater treatment plant is established. Comparing with current selection of process scheme which is decided by economic datd, the model can reflect objectly complete influence of system factors and make evaluation result more reasonable, which offer better scientific reference for selection of cortrol scheme of pollution source. Commonly ,evaluating indicators of scheme include quantitative and qualitative indicator, the multiple objectives decision-making screening model arrived at the hybridtype quantification indicator-synthesis relational level by making qualitative indicator quantified and integrating two kind of indicators.,so selection of process scheme was more scientific and practical.The model was applied to selection of process scheme of Chang Chun 2nd urban wastewater treatmen plant.The level of adult degree of process, capital cost and treatment cost was bigger than that of operation supervision and effluent steability, and the level of floor space and removal of N and P was the smallest. The result of optimized selection was as follows: A/O procces was the best scheme,and Oxidation ditch was second.The paper will provide reference to selection and design of process scheme of urban wastewater treatmen plant. |
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