The Research On The Model Of The Decentralized Wastewater Treament In Rapidly Urbanization

Centralized sewage treatment in the urban sewage treatment is the main form, have good effects, manageable, and "scale effect" of urban water etc, which plays an important role in the protection of the environment. However, due to the sewage treatment facilities for central treatment of construction funds, long period, the urban sewage treatment lag, the urban sewage discharge area as the rapid expansion of urban water environment of the pressure of increasing important area. Distributed sewage disposal mode, can achieve the sewage treatment facilities construction, near with flexible, less investment, can be used as the central treatment mode of beneficial supplement, and has important significance.Based on urban distributed sewage treatment mode as the research object, the first through the concentration and dispersion characteristics of wastewater and restriction factor analysis model of sewage processing area, scattered judgment. Secondly, in the wastewater treatment technology scattered on the basis of analysis of the regional characteristics, according to different constructs the discharge standards and sewage processing mode dispersion recycled scattered processing mode. Finally, the sewage treatment conditionality scattered, formulate the sewage processing operation management mode and dispersion, some conclusions:(1) In the urbanization process, sewage disposal mode should focus on handling, processing, scattered from the whole realization of urban sewage treatment of centralized and decentralized effective combination, improve the urban sewage treatment, improving the urban water environment of the pressure.(2) Sewage processing area scattered judgement is formulated according to the pattern of wastewater treatment technology. Sewage treatment mode application in scattered in the following areas:concentration sewage pipe the discharge planning area, should build a permanent scattered sewage treatment facilities, further according to the requirements, and without water-recovery scattered processing mode will be dispersed after treatment for direct emissions and dispersed after recycling two kinds of patterns. In the sewage pipe construction in concentration areas and facilities for central treatment within the scope of the area, should build lagging temporary sewage treatment facilities, it is scattered and reuse of regional environmental management should be based on request.(3) For discharging standard, through the project and characteristics of wastewater treatment technology in comparison, covers an area of main factors restricting conditions, when sewage discharge standard, executive level can choose aeration bio-filter, biological contact oxidation two distributed wastewater treatment process. When the sewage discharge standard, executive level can choose SBR sewage treatment processes. Distributed Given area restriction, sewage treatment facilities scattered designed buried. For sewage treatment after recycling program, separation and residential two cases were analyzed, it is concluded that when used in urban residential water to water, noise can adopt aeration bio-filter process. When used in landscape water, can be in SBR process, Process can be used as high-grade residential MBR sewage disposal and recycle process. When the university sewage treatment facilities construction from the land area and optionally restrict infiltration filter sewage treating technology, when the sewage treatment facilities construction restricted by area, can choose low operating cost of biological oxidation contact method or biological aerated filter processing technology.(4) Suitable for scattered in the model selection process based on user self-service model applicable hotels, office buildings, business center and sewage disposal system operational management. BOO model suitable for medium and small-scale wastewater treatment and reuse community residents of operation management system. BOT mode is suitable for large-scale residential communities, the economic development zone of sewage treatment system operational management.(5) Proposed sped up for sewage processing system, promote the dispersion of sewage treatment preferential policies and scattered sewage charge policy adjustment and on-line monitoring etc. To promote the application of wastewater treatment mode dispersion countermeasures and Suggestions.