Biogas digester construction technology, construction method of large biogas digester

The method I used: dissolve a handful of laundry detergent in a bucket of warm water and sprinkle it on the area where it may leak (where the smell is heavier), if it bubbles, it means that it is leaking.

I don't know what other people are doing.

1. Detection method:

1.Direct inspection: carefully observe whether there are cracks in the inner wall of the biogas digester, whether the air duct is loose, tap with your fingers or small wooden sticks, whether there is an empty sound in each part of the pool, if there is a empty sound, it means that the plastering layer has a warped shell.

In addition, it is necessary to observe whether there are any traces of external water leakage on the pool wall. For the inconspicuous leakage parts, a layer of cement powder can be evenly sprinkled on the surface, and the places where there are obvious spots or wet lines are leakage holes or leakage joints.

2.Water carving in the pool: open the movable cover, fill the pool with water to the lower edge of the movable cover, wait for the pool wall to absorb enough water, the water level in the pool body will drop to a certain extent, and then fill the water to the lower edge of the movable cover.

After a day and night, if the water level does not drop, it means that the digester is not leaking; If the leak reaches a certain position and does not continue to fall, the distance of the water level drop can be measured from the lower edge of the movable cover or between the water pressures, and according to this position, the cracks or pores existing above can be checked, and then the water can be removed and repaired.

3.Air pressure method: According to the above method, after finding out that the pool body is not leaking, it is also necessary to check whether the air pressure box part is leaking.

The method of air pressure inspection is: first discharge a part of the water in the pool, keep the water level to the zero pressure line, cover the movable cover, seal the movable cover with clay, and then use clay to wipe the movable cover around the movable cover from the pool body, and then connect the hose to the air duct, tie it with red lead wire or wire rope, connect the tee, connect the air pressure gauge at one end, and connect the air pump device at the other end. In the case that there is no air leakage at the joint, the air pressure is expressed to about 4 air pressures in the pool, stop the air pumping, turn off the switch of air pumping, and after 24 hours, observe whether the liquid level between the air pressure gauge or water pressure drops, so as to determine whether there is air leakage.

4.Water pressure method: the difference between this method and the air pressure method is that the water pressure is poured into the pool without the air pumping device but the feed port or water pressure room, because the water level in the pool rises, the volume of the air pressure box decreases, and the air pressure in the pool increases, until the air pressure of the air pressure gauge reaches the requirement, stop adding water, and observe whether the liquid level between the water pressure drops after 24 hours to determine whether the pool body is leaking.

Second, the maintenance method: 1The treatment of cracks chisels the cracks into a "V" shape, pulls the hair around them, and then fills the "V" shaped groove with 1:1 cement mortar, compacts, wipes, and then paints 2 3 times with pure cement slurry.

2.If the cause of the gas leakage is unknown, the gas storage part of the fermentation room can be washed and cleaned first, and then brushed with pure cement slurry 2 or 3 times.

3.If it is found that the plastering peels off or warped shell, it should be removed, rinsed clean, and re-followed the plastering construction operation procedures.

4.If there is a leak of air at the junction between the air duct and the pool cover, the surrounding part can be chiseled, the air duct can be dialed out, and the cement mortar with a higher grade or fine stone concrete can be re-poured, and the local thickening can be made to ensure the fixation of the air duct.

5.The wall of the sinking tank at the bottom of the pool is disengaged, and the cracks can be chiseled into a trench of a certain width and depth and filled with No. 200 fine stone concrete. （

Sprinkle water all over the vault of the pool and use an air pump to pump air into the pool from the main switch, you can listen or see, you can know the air tightness of the pool, and you can also know that it is a leak!

The circular vault is the space for storing biogas gas, and you mainly glue and ash the upper part of the main pool, close the lid and seal it tightly, and there will be no problem.

Determine the height of plus or minus zero, and determine it according to the design drawing; When a new pool starts, apply warm water start, etc.

The height of plus or minus zero should be determined. The depth of the pit is determined according to the design drawing, that is, the top of the digester is kept on a level plane with the discharge port, and is 10 cm above the floor of the pig house. In order to facilitate the placement of the pool mold or the use of brick mold to pour the pool body and reduce the loss of materials, the pool pit should be round and vertical up and down.

For areas with good soil quality, the pit wall can be dug straight, and the soil can be excavated from the middle to the surrounding area.

The construction of large digesters includes the preparation of materials and the preparation of the line of defense.

1. Preparation of materials.

Prepare cement, sand, red bricks for masonry, and ceramic pipes for transporting biogas. The amount of these materials should be determined according to the size of the biogas digester you build, the size of the general biogas digester has two specifications, one is eight square meters, the other is six square meters, and the farmers with a large population can build the eight flat Shenzhi clan square is completely enough for daily use.

2. Preparation for pay-off.

The second is to find the people who have repaired the biogas digester in the village to help put out the line, determine the location of the construction of the biogas digester at home, and then the excavation of the pond pit, the top of the pond pit and the discharge port must be kept horizontal, and the digging pit should not be too shallow.

Matters needing attention during construction

1. The underground water source in the village is abundant, and it is possible to encounter the situation of digging out the groundwater when digging and building a biogas digester, so it must be blocked in time, not to build in autumn and early summer, there is a lot of rain in that season, and the bottom of the pond can not meet too much rain, and it is easy to collapse the pond.

2. During the construction process, the waterproof layer is painted with cement on the surface of the pool wall, which is to avoid the long-term use of groundwater leakage in the biogas tank to make preventive preparations in advance, and to brush another layer of waterproof layer, and add a cushion layer to the bottom of the pool to prevent the bottom layer from collapsing. Attention must be paid to the construction of a biogas digester, because if it is not repaired well during construction, gas leakage will occur in the future, and it must be repaired firmly once it is built.

Summary. 3. Modeling: First draw a circle with a radius at the selected position.

Remove the soil in the middle. To be on the safe side, keep the soil away from the circle. After calculation, the depth of the pool, the height of the FRP overlay, the floating soil layer.

So dig rice deep. Plastic film can be placed around the soil wall as needed. 4. Anmo:

A 3m straight rod is set in the center of the excavation pool, one end is inserted into the center, and the other end is fixed with three strings. Then with the rod as the center, the wooden formwork is installed for the radius. Place the inlet and outlet pipes at the same time.

5. Pouring: Check the stability of the wooden formwork after it is installed. The walls of the pool are then poured with concrete.

Quickly place the concrete between the formwork and the earthen wall. Pay attention to the earthen wall to prevent the clods from falling in, and then use a vibrator to tamp the concrete. Finally, close the lid and pour into the bottom of the pool.

In case of groundwater, it should be emptied at any time. The hole cover plate in the picture is surrounded by concrete. Be careful not to move the lid laterally.

A 40 cm thick concrete is placed around the lid, then the lid and the tank wall are poured together, and finally, the pool bottom is poured.

Dear, hello The construction method of the Nugxiao quiet gas tank is: 1. Site selection It is best to choose a dry place without underground flooding. Consideration should be given to using the outlets of toilets and the excrement outlets of livestock as feeds for the digester.

2. Material Use concrete to pour the surrounding area of the biogas digester. Use a well-made wooden formwork. Also use a vibrator to stir the sturdy garffin pomace.

These basic materials and tools should be prepared.

3. Modeling: First draw a circle with a radius at the selected position. Remove the soil in the middle.

To be on the safe side, keep the soil away from the circle. After calculation, the depth of the pool, the height of the FRP overlay, the floating soil layer. So dig rice deep.

Plastic film can be placed around the soil wall as needed. 4. Safety model: Set up a 3m straight rod in the center of the excavation pool, insert one end into the center, and fix the other end with three strings.

Then with the rod as the center, the wooden formwork is installed for the radius. Place the inlet and outlet pipes at the same time. 5. Pouring:

Check the stability of the wooden formwork after it is installed. The walls of the pool are then poured with concrete. Quickly place the concrete between the formwork and the earthen wall.

Pay attention to the earthen wall to prevent the clods from falling in, and then use a vibrator to tamp the concrete. Finally, cover the lid and pour it into the bottom of the pool. In case of groundwater, it should be emptied at any time.

The hole cover plate in the picture is surrounded by concrete. Be careful not to move the lid laterally. A 40-centimeter-thick concrete is placed around the lid, then the lid and the wall of the tank are poured together, and finally, the bottom of the pool is poured.