Up to now, there are more than 600,000 administrative villages and over 2.5 million natural villages in our country, living more than 200 million rural households and nearly 800 million people. Since the 80s of last century, the water pollution crisis in rural areas has been prolonged for many years and has been getting worse. The current situation is not optimistic but also the beauty of the countryside is imperative Most rural households in rural China have achieved drinking water safety and basic sanitation and safety, but the status of rural wastewater treatment is not optimistic. On the one hand, the endogenous sources of pollution from rural areas did not decrease in the opposite direction; On the other hand, the infiltration of urban domestic sewage and rural industrial waste water is hard to eliminate in the short term. Under the superposition of multiple factors, the fascinating rural scenery is no longer maintained. Searching for a clear spring has also become a luxury in many places. Therefore, it is a new task of building a new socialist countryside for water conservancy projects that also beautifies the countryside and strengthens the collection, treatment and recycling of rural domestic sewage. (Source: Ministry of Housing and Urban-Rural Development) Nowadays, the discharge channels of domestic sewage in natural villages in our country are mainly directly sprinkled on the ground, discharged into the river nearby or into the river through sewers. The existing problems are summed up the following points:
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