The whole process of biogas digester establishment, how to build and use biogas digester

It's too broad. I will introduce you to the simple process of the household biogas digester for your reference:

1. Site selection; 2. pay-off; 3. digging a pit; 4. Formwork pouring; 5. Powder paste sealing; 6. Installation of pipelines, stoves, etc.; 7. Test water and pressure; 8. Feeding start; 9. The stove is lit and the lamp is on.

Determine the height of the plus or minus zero of the bai, and DU is determined according to the design drawing; When a new pool starts, a warm DAO is applied

Water start and other versions.

The height of positive and negative 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 new pond is preferably started with pure cow and horse manure. When a new pool starts, warm water is applied to start. The water temperature is 30 -50, and it is forbidden to use cold water to start and prolong the starting time.

After feeding, seal the movable cover as required, and pay special attention to sealing the skylight to prevent air leakage. The gas produced at the initial stage of start-up is exhaust gas, which cannot be burned, and should be discharged for 7 days for more than 30 minutes a day.

(1) If simple manure is used as raw material for biogas fermentation, the start of the biogas digester is relatively simple, as long as there is a sufficient amount of inoculum, and the amount of inoculum generally accounts for 15% and 30% of the fermentation liquid. The liquid can be directly taken from the discharge room of the fermentation tank that is running. The sludge from the bottom of the pond, the sediment at the bottom of the manure pit, and the sludge from the city sewage can also be used as inoculum for enrichment and culture, and gradually expand until a large number of inoculated microorganisms are produced.

The total solid content of the fermentation raw materials is about 6%, which is generally simply calculated as putting in 1 part of manure and 3 parts of water, and the total amount of feeding reaches 85% of the volume of the biogas digester, and the movable cover of the biogas digester can be sealed, and when the pressure difference of the water column of the biogas pressure gauge reaches more than 40 cm, all the gas will be discharged. At this time, the biogas cannot be ignited because the air in the gas chamber of the biogas digester is not discharged. When the biogas pressure rises again, with the increase of methane content in the gas, the biogas can be ignited and used, which can be used in 2 to 4 days under normal circumstances.

2) When starting with straw as the main fermentation raw material, first spread the air-dried short or crushed crop straw on the open space next to the biogas digester, with a thickness of about 30 cm, and splash the mixed manure raw materials, inoculum and an appropriate amount of water (the water consumption should be wetted and not flowing, and generally not more than 1 3 of the total water added, and within this dosage range, it should be less in winter). When mixing, it is required to mix well while splashing, and the operation should be fast to avoid the loss of fecal liquid and water. There is no condition to mix into the pool where you can use the method of layered feeding, layered inoculation, first add a layer of straw and then add a layer of manure and inoculum, each layer should not be too thick and should be compacted layer by layer.

After the pile, it is covered with plastic film and piled up, generally 2 to 3 days in summer and 5 to 8 days in winter. The volume of the straw after the pile is reduced to facilitate fermentation in the pond, and the fermentation bacteria multiply in large numbers during the pile process, and the temperature rise can reach up to 60. Stacking can also be carried out in the biogas digester, after the temperature rises to 40 60, you can add water to adjust the pH, if the pH is lower than 6, you can add an appropriate amount of plant ash, lime water to adjust the pH to 7, you can cover the movable cover to seal the pool, and the gas can be deflated and ignited on the biogas stove after 2 or 3 days of sealing the pool.

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.