Optimization Research On Municipal Wastewater Reclamation And Reuse Infrastructure

Growing water scarcity and deteriorating water environment have aggravated the urban water crisis. Sustainable management of water resources has become a consensus, that is, the sustainable water resources system which always satisfies social objectives and maintains the ecological, environmental and hydraulic integrity has gradually been recognized. Wastewater reuse is the most effective measures to solve the problem of water shortage that combine environmental protection to raise water resource supplying quantity income and save new source of water. The reasonable planning and construction of municipal wastewater reclamation and reuse infrastructure is the premise and guarantee for successful implementation of wastewater reuse. So, optimization Research on Municipal Wastewater Reclamation and Reuse infrastructure has practical application value and significance. Therefore discussion has been carrying out in the following:Firstly, based on Cloud Model which integrates fuzziness (both this and that of boundary) and randomness (probability of occurrence) and Binary Fuzzy Comparison Weighting Method, this paper evaluates demand degree of our country's wastewater reuse project. Five factors such as per capita water resources, water resources variation coefficient, per person GDP, eco-environment water use rate, driving force of water pollution were selected as evaluation factors. After drawing the corresponding thematic map and analyzing the evaluation results, this paper proposes appropriate water resources management recommendations. The result indicates that each region of our country shows significant difference in demand degree of wastewater reuse project. On the whole, areas of high demand concentrate in the eastern part of China, namely the Northeast Plain, the North China Plain and the coastal cities. Besides, the demand degree shows a weakening trend from east to west.Secondly, this paper discusses about the wastewater reuse treatment method and plant site location problem in wastewater reclamation regional planning. This paper build the corresponding annual cost function considering life cycle cost of wastewater reclamation system engineering and multi-layer reclaimed water diversion in the planning area. Then, we can get the value of critical distance according the cost function when the largest centralized treatment economic benefits of region is equal to the cost of reclaimed water diversion. Taking the critical distance as the economic criterion of urban sewage centralized or decentralized treatment. An example of layout planning for the wastewater reclamation system validated the practicability and economy of the method.Finally, the paper builds a reclaimed water supply network reconstruction model, which copes with an increasing number of reclaimed water users and rising reclaimed water quantity day by day. The reconstruction model minimizes the cost of pipe network infrastructure investment and operating cost, under meeting user requirements in the amount of water pressure and water flow velocity. The model was solved by genetic algorithm. An example of reconstruction for the wastewater reclamation supply system validated the feasibility of the model.Overall, this article, based on system theory, provides economic, practical and effective optimization methods for municipal wastewater reclamation and reuse infrastructure planning, after evaluating the demand degree of our country's wastewater reuse project. This Research has practical application value and significance for promoting the utilization of recycled water and better water management.