Method and device for purifying domestic sewage

Abstract

The invention provides a method and device for purifying domestic sewage. The method includes the steps that the to-be-treated sewage flows through more than two stages of earthworm biofilters, and supernatant obtained after the sewage is precipitated is purified water. The device comprises a water distributor, a purification part and a precipitation part, wherein the water distributor, the purification part and the precipitation part are sequentially arranged in the flowing direction of the to-be-treated sewage. The purification part comprises the at least two stages of earthworm biofilters, the earthworm biofilters are filled with spherical ceramsite filler, eisenia fetida is inoculated, and biological film microorganisms can grow on the spherical ceramsite filler. Due to the fact that earthworms and the biological film microorganisms are contained in the earthworm biofilters at the same time, the activity of biological films can be improved and the blockage problem can be solved through stirring of the biological films by the earthworms in the biofilters, intercepted organic pollutants can be continuously degraded by the microorganisms, the earthworms and the microorganisms achieve the synergistic effect on purification of the to-be-treated sewage accordingly, the sewage can be more efficiently purified, and recycled purified water can be obtained.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a domestic sewage purification method and a domestic sewage purification device. Background technique [0002] For a long time, my country's sewage treatment has focused on the treatment of urban domestic sewage and industrial point source sewage. At present, the treatment rate of municipal sewage in my country has reached 77%, and it is expected to reach 85% in 2015. [0003] According to statistics, there are more than 600,000 administrative villages in my country, with a population of about 760 million people. The rural areas of the country produce about 8 billion tons of domestic sewage every year. However, 96% of the villages have no drainage channels and sewage treatment systems, and domestic sewage is discharged at will. Leading to rural domestic sewage has become one of the important factors of water pollution in my country's main river basins, which not only direc...

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Problems solved by technology

[0003] According to statistics, there are more than 600,000 administrative villages in my country, with a population of about 760 million people. The rural areas of the country produce about 8 billion tons of domestic sewage every year. However, 96% of the villages have no drainage channels and sewage treatment systems, and domestic sewage is discharged at will. Leading to rural domestic sewage has become one of the important factors of water pollution in my country's main river basins, which not only directly threatens the health of rural residents, but also hinders the healthy and sustainable development of rural economy

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