Domestic sewage treatment process and apparatus

Abstract

The invention discloses a domestic sewage treatment process, which comprises the following steps that: sewage enters an anaerobic pond to carry out a degrading reaction after being filtered, outlet water automatically flows into a middle adjusting pond, and outlet water of an artificial wetland pond part flows back to the middle adjusting pond; water of the middle adjusting pond enter oxygen lack environment, high-concentration mud in the sewage is discharged to the anaerobic pond, and NO2-NO3-N ions in circulating water are subjected to denitrification under the oxygen lack environment; the outer water after an oxidation reaction automatically flows into an aerobiont reaction tower; and the outlet water of the aerobiont reaction tower automatically flows into the artificial wetland pond of which the inside is provided with emergent aquatic plants, floating plants, fish and shrimps. The invention also discloses domestic sewage treatment equipment. On the basis of the prior domestic sewage treatment mode, the method sufficiently utilizes the low cost of an anaerobic wetland method and the high efficiency of an aerobiont method, and greatly reduces the cost of the water treatment. The whole flow does not needed to add medicines, and reduces the cost. Power consumption only comes from a lifting pump of the middle adjusting pond, and energy consumption is greatly saved.

Description

technical field [0001] The invention relates to a domestic sewage treatment process and equipment. Background technique [0002] With the development of the economy, a large amount of nitrogen (N) and phosphorus (P) wastewater is discharged into rivers, lakes and other water bodies, resulting in serious eutrophication of many rivers and lakes. In 2001, the national rural domestic sewage discharge was about 8.32 billion tons, and the biochemical oxygen demand (COD), nitrogen and phosphorus losses were converted according to the per capita discharge intensity. The total COD and total nitrogen (TN ) and total phosphorus (rrP) were 8.321 million tons, 582,000 tons and 141,500 tons, respectively. A large number of pollutants in domestic sewage aggravate the pollution of the receiving water body, causing the water quality to deteriorate, especially the sewage contains a large amount of nitrogen and phosphorus, which will make the water body eutrophic, which is one of the importan...

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