Method for treating rural disperse sewage by using high load vermibiofilter

Abstract

The invention discloses a method for utilizing high-load earthworm biological filter to treat decentralized sewage in countries, and relates to a sewage treatment method. The treatment method comprises the following steps: the decentralized sewage in the countries is firstly collected; suspended matter and floating matter are removed by a pretreatment tank; BOD5 is led to be 110 to 160mg/L, COD is 120 to 150mg/L and SS is 90 to 130mg/L; then the obtained mixture is pumped into the high-load earthworm biological filter according to hydraulic loading of 4 to 6m<3>(m<2> question mark d); after passing through a first earthworm biological filtering layer and a second earthworm biological filtering layer which are filled with light shale spherical porcelain granules (7) filtering media with the diameter of 3 to 7mm and 15000 to 28000 eisenia foetidas (8) are added on the surface of the filtering media per square meter, the water which is discharged from a settling tank (6) and has BOD5 of less than 15mg/L, COD of less than 60mg/L and SS of less than 15mg/L reaches the national water quality standard for field irrigation; little amount of residue sludge which is collected by the settling tank (6) and contains wormcast is used for improving the soil or is used as fertilizers. The method has large hydraulic loading, small occupy area, is hard to be blocked, has simple process and operation, good water outlet quality and low construction cost and operating cost and can be widely used for treatment of the waste water in rural areas.

Description

technical field [0001] The invention discloses a method for treating scattered rural sewage by using a high-load earthworm biofilter, relating to a sewage treatment method. Specifically, a device consisting of a pretreatment pool and a high-load earthworm biofilter is used to treat rural scattered sewage. It belongs to the technical field of sewage treatment. Background technique [0002] With the development of our country's economy and the improvement of people's living standards, the problem of water pollution in rural areas has also attracted increasing attention. In rural areas, the residential area is scattered, the amount of domestic sewage is small, and there is no drainage system matching the water supply pipeline. Therefore, rural sewage is often discharged into the nearby ponds or rivers without any treatment, giving the plain river network with dense rivers and lakes The area causes water pollution, causing serious harm to human health. [0003] At present, th...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method that can greatly improve the hydraulic load and sewage treatment in view of the shortcomings of the existing rural decentralized domestic sewage treatment technology, such as low hydraulic load, complex filler structure, easy to block water accumulation, and difficulty in long-term

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