Comparison and analysis of rural domestic sewage discharge standard in Northwest China

The overall treatment rate of rural domestic sewage in Northwest China is lower than that of national average level. In order to effectively improve regional rural sewage treatment capacity and enhance management level of water environment during local villages，the governments of northwest provinces （autonomous regions） have successively promulgated the discharge standards for pollutants of rural domestic sewage treatment. By comparing the discharge standards of rural domestic sewage in Shanxi Province，Shaanxi Province，Gansu Province，Qinghai Province，Ningxia Hui Autonomous Region，Xinjiang Uygur Autonomous Region and Inner Mongolia Autonomous Region with Pollutant Discharge Standards of Urban Sewage Treatment Plants and the Water Quality Standards of Farmland Irrigation，it is revealed that the standard classification of the seven northwest provinces （autonomous regions） is mainly based on the surface water environmental quality standards and the scale of treatment facilities. In addition，the control index selection of local standards is basically consistent with the pollutant discharge standards of urban sewage treatment plants while the standard limitation is relatively loose. Meanwhile，the third level of the seven Northwest provinces（autonomous regions） is suitable to the water quality requirements of farmland irrigation，of which the Inner Mongolia Autonomous Region，Gansu Province and Xinjiang Uygur Autonomous also specified clear provisions. Moreover，with in-depth summary and analysis of the discharge standards of rural domestic sewage in northwest China，the thinking for the priority selection of the discharge standards for pollutants of rural domestic sewage treatment would be guided to the suitable discharge standard for the treatment of rural domestic sewage. In addition，It will provide not only ideas for the applicable technical system and treatment mode of rural domestic sewage treatment in the arid region of northwest China，but also for the contributions to improve the policy decision-making level on rural water environment treatment of local governments.