Southern Shaanxi Rural Sewage Treatment Technology Integration Research

With the rapid development of rural economy, the enviramental pollution caused by rural domestic sewage is more seriously. Because the the number of rural is more and dispersed, and the construction of environmental infrastructure is seriously lagging behind, coupled with a long time can’t get enough attention, the serious affects on regional environment is increasing, although the volume of sewage discharge in a single village is less.At present,there are laking economic and affordable sewage treatment technologies for rural domestic sewage treatment.This study analyzed the quality and quantity characteristics and restricting factors of rural domestic sewage systematically. Based on the analysis and comparison of common sewage treatment technologies, followed the low-cost, less maintenance, ecology and better effects of sewage treatment technologies’ selection principles. For technology integration according to the topography and sewage treatment scale, proposed sets of sewage treatment technology.Through the above study are the following conclusions:(1) Sewage treatment process should consider the sewerage conditions, infrastructure and running costs, the receiving waterbody after treatment and comprehensive utilization. Priority should be given to the natural ecological treatment system and "natural+artificial" treatment system.(2) Village in mountain and hilly areas, when the total number of households which less than10.sewage treatment process should be adopted "Digester"、"Courtyard constructed wetland"; Total number of households which larger than10， sewage treatment process should be adopted "Anaerobic digester++Artificial wetland/Stabilization Pond"、"Enhanced Primary-Soil subsurface infiltration"、"Sewage purification digester"、"Anaerobic digesters+Waterfall aeration contact oxidation+Constructed wetland".(3) Village in the plain area, when the total number of households about50to200, sewage treatment process should be adopted "Anaerobic digester+Artificial wetland"、"Anaerobic digester+Ecological Pond+Ecological Drainage". When the total number of households larger than200, sewage treatment process should be adopted"’Anaerobic+Facultative+Aerobic’ponds"、"Stabilization pond+Artificial wetland"、"A/O+Artificial wetland".(4) Township sewage treatment which focused on domestic sewage should be adopted "Anaerobic+Combined artificial wetland". Township which relatively large number of industrial enterprises, sewage treatment should be adopted "A2/O process"、"CASS process"...