A Study On The Mode Of Decentralised Sanitation And Reuse

Water resource plays the pivotal role in ecological environment, and also be considered as the strategic status in economical resource. With the increasing of population, urbanization, the development of agriculture and industry, the water resource crisis should not be neglected cause the restriction of economy and society. One hand, the city sewage resources reusing may alleviate the lack of water resource, and to use the limited fresh water resources highly effective; in the other hand, the method reduces the total quantity of natural water body pollutant, has various effect, which already became the optimal strategy in water resource solution for all different countries around the world.In many ways to make the sewage regeneration become true, the central sewage treatment system is the important sewage treatment way nowadays. When carries on the large-scale sewage treatment, the process has the advantage of operating in low cost and convenient maintenance for management. However, with the growing scale, the process is lack of sustainable function obviously, following its shortcoming revealed gradually. Therefore, we need a new sewage treatment way which called point source disposal, also called decentralized sanitation and reuse. It should conform to the current economical development requirement; simultaneously will make the impact for environment to be lowest, the research and the establishment of decentralised sanitation and reuse mode which adapt to local environment also has far-reaching significance.The paper referred massive correlative literature material, embarked from the fundamental content of decentralized sanitation and reuse, in the analyzing of the domestic and foreign experiences and messages, it elaborated the present traditional city sewage treatment system and conbine with the foreign development tendency and the research results for carrying on the analysis and the ponder to the research object, systematically elaborated the new decentralized sanitation and reuse system mode. The paper analyzed the source control pattern of drainage in DESAR system, on the analysis of traditional domestic sewage's types and quality, constituted the faecal separation and urine diversion system, the ecological drainage system mode, and also analyzed the risk of the urine and feces reuse. On the analysis of technologic choice in sewage treatment, expatiated on the technologic combination mode, established the DESAR system mode in suburbs (country) and city architectural complex (community). Contraposing the management problems which exist in the DESAR system, proposed the new management pattern, and carried on the correlative appraisal to the DESAR system. Took the regenerative water reusing project of Shanghai Greenland Century City as an example, has carried on the water volume balance analysis, the craft analysis and the technical economic analysis. Finally, proposed the forecast and the suggestion to the DESAR system.