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...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: based on the limitations of the anaerobic effect, the sewage treatment effect is very obvious for high-concentration domestic sewage, that is, the COD value is between 3000 and 30000; for low-concentration bottom domestic sewage, the COD value is between 100 and 300 The room efficiency is relatively low, and it is difficult for the effluent to meet the standard with a single treatment method

The disadvantage of this method is: for low-concentration domestic sewage in rural areas or communities, that is, sewage with a COD value between 100 and 300, the biochemical property is very good. After adopting dynamic aeration, the effluent can meet the discharge standard, but the power consumption is relatively large. , it is difficult to popularize small-scale rural sewage treatment

(Disadvantages: only the use of rural sewage, and the output of biogas must be very small, the production of biogas has not substantially improved the energy used in rural life, and the maintenance workload is large, and it is difficult to promote

The disadvantage of this is that the wetland or plant absorption is set after one of the above treatment methods to further absorb and degrade the pollutants in the water

Although this method successfully solves the problems of energy consumption and water quality discharge, the wetland covers a large area and the construction cost is high. The domestic sewage discharged by a natural village of 50 households occupies an area of ​​1200m2 2 Left and right; or adopt a three-dimensional multi-layer structure, although the land area is greatly reduced, but the follow-up brings huge civil engineering costs and complex structures

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