How to make biogas digesters

1, the pool site should be located in the lee of the sun, which is convenient to be combined with the pigsty toilet. The design of the pool body should not be too deep, the height of the pool wall should be 50-80cm, and the diameter of the main pool can be appropriately increased compared with the hydraulic biogas digester with the same volume.

2. The bottom of the pool is made into an inverted arch, and the thickness of gravel cushion is 10 cm. After tamping, cast-in-place concrete number. Use 150. The wall of the pond shall be built with 75 or more machine bricks or cast-in-place 150 concrete.

3. The inlet and outlet pipes shall be cement culvert pipes with a diameter of 20cm. Soak in water before construction and seal with cement slurry for 3-4 times. The height of the lower opening should be placed in the center of the height of the pool wall, and the joint between the culvert pipe and the pool wall and vault should be reinforced with concrete.

There should be two movable openings on the tank cover. After using machine brick to support arch formwork, make yellow mud isolation layer and cast-in-place 200 # concrete. When pouring the movable mouth, attention should be paid to the placement direction of the movable mouth and the distance between the two mouths. The side of the movable mouth near the pool wall should be thickened and leveled with concrete to facilitate the installation of the hydrosphere. A copper airway is placed at the top of the pool.

5. After the main pool is built, the water pressure room can be built. The location of the water pressure room is as shown in the figure, and its center should be on the wall of the main pool. Half is on the vault of the pool, and the other half is outside the pool wall. Dig a circular pit and place the prefabricated parts of the return hole. The depth of the backwater hole should be 20 cm deeper than the water pressure room, and the bottom of the water pressure room should be 5 cm higher than the liquid level of the main pool. The effective depth of the water pressure room should be equal to the distance from the bottom of the pool to the lower mouth of the circulating pipe, and an overflow port is left at the upper mouth of the effective depth of the water pressure room.

6. Laying of circulating pipe: The circulating pipe can be carried out at the same time as the construction of indoor backwater tunnel in hydraulic engineering. The circulating pipe is made of steel pipe or rigid plastic pipe with an inner diameter of 60cm. The circulating pipe is placed at an angle of 40 degrees with the ground. The upper end of the circulating pipe is close to the inner wall of the vault in the grass pond, and the height should be on the same plane as the bottom of the hydraulic chamber. The lower end is in the backflow tunnel, and the depth from the bottom of the hydraulic chamber to the overflow port is equal to the position from the bottom of the hydraulic chamber to the overflow port.

7. Before painting the inner wall of the main tank, build a partition wall in the tank. The partition wall is made of brick with a thickness of 12cm. There are communication ports in the middle and below the effective depth of the fermentation broth, and the height of the partition wall is higher than the static liquid level in the tank. After the laying is completed, the "five-layer method" of the sealing layer refers to GB4750-84 "Standard Atlas of Rural Household Hydraulic Biogas Ponds" to paint the whole pond.

Extended data

Application characteristics of biogas digester

1. Provide cheap and high-quality fuel for rural areas. For a family of 3-5 people, build a 6- 10 biogas digester. As long as the raw materials are sufficient, it can provide 9- 1 1 month of cooking and lighting fuel a year. Because biogas slurry can be used as pesticide, fertilizer, feed and so on. It can also be used as a resource to achieve the purpose of saving.

2. Change farmers' old living habits and improve rural living environment. The biogas digester will be built with toilets and pigsty, which is not easy to breed mosquitoes and has no odor. It will play an important role in eliminating infectious diseases such as schistosomiasis and hookworm disease.

In addition, due to frequent human activities, a lot of energy is consumed, and a large number of straws and livestock manure are piled up in the open air. , leading to a large amount of carbon dioxide emissions, which aggravated the greenhouse effect. The use of biogas digesters can reduce the above problems to some extent. ?

3. Promote the development of ecological agriculture and animal husbandry. The waste produced by biogas digesters is biogas slurry and biogas residue, which can be used as pesticide additives, fertilizers, feed and so on. The harm of chemical fertilizers and pesticides is greatly reduced, which is beneficial to the production of green products and pollution-free products.

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