For rural domestic sewage, the following treatment can be carried out:
Living wastewater → septic tank → anaerobic pool → artificial wetland (planting plants with well-developed root system, moisture-loving, strong absorption ability of plantain, water onion, calamus, etc.) through the "filtered "The method of discharge after treatment.
2, for urban sewage, the following treatment can be carried out:
City sewage will be transported to the rural areas around the city, the use of rural areas of the vast land to purify the urban sewage will be once and for all with a good way to kill many birds with one stone.
The daily supply of domestic tap water 100W cubic meters of large and medium-sized cities, for example: ordinary sewage treatment facilities cost 1,000 yuan / cubic meters. Construction cost of 1 billion, the annual operating cost of 100W cubic meters / day × 365 × 0.5 yuan / cubic = 180 million. Using soil purification method construction cost of 1000 yuan / cubic meter, the annual operating cost of 100W cubic / day × 365 × 0.1 yuan / cubic = 0.4 billion. At the same time, the annual saving of agricultural water resources 360 million cubic meters, saving fertilizer about 10,000 tons / year, reduce pesticide use 5 tons / year, the comprehensive benefits are considerable.