Rural domestic sewage treatment: biogas sewage treatment technology

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1. Basic concepts

Domestic sewage purification biogas digester is a new type of structure for decentralized treatment of domestic sewage. It is suitable for towns that are unable to build sewage treatment plants in the near future, or units outside the urban sewage pipe network, office buildings, residential areas, tourist attractions, houses, hotels, schools and public toilets Wait. Studies have shown that the winter groundwater temperature can be maintained in 5~9 ℃ above the region, or in the pool built solar greenhouse temperature up to this temperature area, can use the purification pool to deal with domestic sewage and feces.

2. Technical principles

Domestic sewage purification biogas digester is a multi-pole baffled digestion system that integrates a water-pressure biogas digester, an anaerobic filter and a facultative pond. After removing coarse solids through the grid, the manure enters the pre-treatment area through the sedimentation tank for biogas fermentation, and gradually flows backward. The generated sludge and suspended solids settle in the second half of the area and slide back to the front along the inclined bottom of the tank, and then mix with the newly entered manure for biogas fermentation. The clear liquid overflows into the pre-treatment area, where it is mixed with other domestic sewage other than feces for biogas fermentation, and flows backward through the anaerobic filter part. With the biofilm key bacteria on the filler, the sewage is further anaerobically digested, and then overflows into the post-treatment tank. Both the pre-treatment area and the pre-treatment area are improved water-pressure biogas digesters. The post-treatment area is a three-stage baffle and facultative pool, which is connected to the atmosphere. The upper part has a foam filter plate to intercept suspended solids to improve the water quality.

3. Technical characteristics

Domestic sewage purification biogas digester is to treat the scattered domestic sewage at the source, improve the living conditions, protect the environment and beautify the city. At the same time, the treated sewage can be directly used for farmland irrigation or discharged into river waters, which reduces the eutrophication of water bodies, is conducive to the protection of clean water sources, and has good environmental protection effects. This method is used to treat urban domestic sewage with less investment and quick results. Due to anaerobic treatment, the amount of sludge is reduced by 95%, and the amount of sludge removed and transported is reduced accordingly, thus alleviating the contradiction of the current difficulty in transporting dung in the city.

Sewage Treatment Technology of Septic Tank

1. Basic concepts

Septic tank refers to the domestic sewage grid precipitation, and anaerobic digestion of sludge, removal of suspended organic matter in domestic sewage small treatment structures, belongs to the primary transitional life treatment structure. It is a device that processes manure and filters sediment. Septic sewage treatment technology is used to store solid organic matter flowing continuously from the sewage pipe until it decomposes due to the action of anaerobic microorganisms.

2. Technical principles

The working principle of septic tank sewage treatment technology is: the solidified material is decomposed at the bottom of the tank, and the upper hydrate body flows into the pipeline to prevent the pipeline from being blocked. After anaerobic digestion for more than three months, the settled sludge decomposes the organic matter in the sludge into stable inorganic matter, and the easily corrupt raw sludge is converted into stable cooked sludge, which changes the structure of the sludge and reduces the moisture content of the sludge, sludge is regularly cleared and transported, landfilled or used as fertilizer.

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