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Tianjin Ninghe Zaojia Village Sewage Separation Project, 4,200 households, about 10,000 people. China's largest rural sewage source separation negative pressure drainage project. It is difficult to solve the problem of sewage discharge caused by high underground water level and narrow space. The sewage discharge point does not store sewage, does not need to be connected to electricity, the pipeline is thin, the broken road surface is less, the buried depth is shallow, and there is no lifting pump station.