The so-called native city sewage is life or direct discharge of untreated industrial wastewater, sewage treatment equipment direct cell, using the method of the present stage is untreated sewage directly into the sewage source heat pump system. Municipal Wastewater Treatment: urban sewage transported to the countryside around the city, Boertala residential sewage treatment equipment, the vast rural land use to purify municipal wastewater. It would be a good way to once and serve multiple purposes. Living with a daily water supply of medium-sized cities cubic 100W Case: Common sewage treatment facilities cost 10 yuan / cubic meters. 1 billion construction cost, annual operating costs 100W cubic meters / day × 365 × 0.5 yuan / cubic meters = 180 million. Soil decontamination method using construction cost 1,000 yuan / cubic meters, residential sewage treatment equipment manufacturers, the annual operating costs 100W cubic meters / day × 365 × 0.1 yuan / cubic = 040 million, while annual savings of 360 million cubic meters of water for agricultural, fertilizer saving about 10,000 tons / year, reducing pesticide use 5 tons / year, the comprehensive benefit is considerable.