Study On The Optimization Model For Intermediate Water Treatment Process In Residential Quarter And Planning For Dispersed Mode Of Intermediate Water System

China is a country lacking water resources. In recent years, the water shortage in northern cities has increasingly become serious, especially in the big cities and the development of economy may be decelerated seriously because of water shortage. So, intermediate water reuse is an efficient way to solve the problem and adopted by lots of nations. However, the choice of intermediate water treatment process is one of the most difficult problems in engineering design. In this paper, in order to find the solution and realize the optimal process, the author studied the optimal method of intermediate water treatment process in Beijing Forestry University and the dispersed mode of intermediate water supply system planning, which can help to rationally use water resources and harmonize the relationship among economy, technology and environment. The research has provided reference to intermediate water projects in residential quarter as well as other similar area.The optimum of intermediate water supply system optimum has provided a valuable pattern for intermediate water supply projects and the major conclusions are as the following:(1) Based on the current research, a more perfect assessment indictors system of intermediate water treatment process and optimal structural model are established by means of theoretic analysis and consultation, and A weight system is established by Analytic Hierarchy Process(AHP) method.(2) The optimal method of intermediate water treatment process is set up and uses it to research the students'utility area in Beijing Forestry University. By means of separation and combining intermediate water treatment chain, the method realizes the combination of process unites theoretically and can create new process. Thus, it proofs that the method is carried through completely.(3) A mathematic model of optimum intermediate water supply system in residential quarter is established on the basis of the analysis of cost relation in each subsystem of the intermediate water supply system and a procedure used to solve the model is written by Lingo language.(4)The author chooses the Beijing forestry university as the research area and gets result: the annual working cost is 0.5559 million yuan, and the cost of producing one ton intermediate water is 1.64 yuan, and the demands for intermediate wate are satisfied.