Sewage treatment system and sewage treatment method

Abstract

The invention belongs to the field of sewage treatment, and discloses a sewage purification system. The sewage purification system comprises a watercourse, wherein the watercourse is at least 1000 meters long, at least 3 meters wide and 1-4 meters deep. An emerging plant area, a water-planted commercial crop area and a submerged plant area are planted along the watercourse in the flow direction of the sewage, wherein the emerging plant can be cane shoot or lotus root; the water-planted commercial crop can be water-planted cress, leaf lettuce, lettuce, water convolvulus, ryegrass or the like in spring and summer, or water-planted green vegetable, shallot or the like in autumn and winter; the sunken plant can be waterweed, Potamogeton crispus L or eel grass; and at least 100kg of spiral shells and at least 100kg of freshwater mussels are stocked in the watercourse. By planting the emerging plant area, the water-planted commercial crop area and the submerged plant area in the watercourse of the sewage treatment system and simultaneously stocking the spiral shells and the freshwater mussel filter-feeding benthic species, the invention intensifies the wetland ecosystem restoration function, can effectively improve the water quality, is especially applicable to the purification of rural domestic sewage, and can be used as the matching technology for new countryside construction.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a sewage treatment system and a sewage treatment method, in particular to an ecological purification method for river sewage. Background technique [0002] According to the water quality evaluation conducted by relevant departments on 134,600 kilometers of rivers and 322 reservoirs across the country, nearly 40% of the river water has been seriously polluted. Among the 412 monitoring sections of the country's seven major water systems, 27.9% of the water is inferior to Class V, that is, nearly 1 / 3 of the water used for agricultural irrigation is unqualified, and 90% of the urban groundwater has been polluted. In some areas and river basins, water pollution has clearly shown a trend of extending from tributaries to main streams, from cities to rural areas, from surface to underground, and from land to ocean (Li Guoqiang, 2006). [0003] There are many reasons for water pollution, in...

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Problems solved by technology

[0004] There are many research reports on the use of aquatic organisms, especially aquatic plants, to purify water quality. However, due to insufficient research on the purification ability and growth and decline of purification organisms, the seasonal differences in purification ability are large, and the follow-up utilization of plants involved in purification is mostly unresolved.