First, to ensure the confinement of the biogas digester, during the construction of the pool
After each part of the tank reaches a certain strength, check whether the digester is leaking and leaking. Observe whether the plaster layer in each part of the tank cracks or falls off. Check the surface of the tank for honeycomb and obvious pores, and tap the surface. Listen for sounds. If there are honeycombs and significant pores, continue to brush according to the sealing technique; if there are holes and cracks, knock it out.
Second, improve the fermentation temperature in the pool
1. Warm up and promote decay. When recharging and feeding the biogas digester, appropriate amount of warm water can be added to the tank to increase the temperature in the tank, and the temperature in the tank should be maintained at 5°C or more to promote the production of new material.
2. Cover insulation. The surface of the biogas digester is covered with heat-insulating materials such as crop straw, firewood, compost or thickened soil layers, and the coverage area must be greater than the surface of the pool in order to prevent cold air from entering.
3. Dig ring groove insulation. Dig a circular ditch around the methane tank and stack the dung and grass in the ditch so as to facilitate the fermentation of the tank material.
4. Plastic shed insulation. Cover straws, sheep pens, chicken coops, burdock, and other sunny places with plastic film or plastic film covering the top of the digester. Use straw as a biogas digester, and extend the plastic film 2-3 meters outward. The plastic film can cover the feed inlet, discharge outlet, water pressure outlet and surrounding ground to increase the pool temperature.
Prepare high-quality inoculum
When it is difficult to obtain a large amount of inoculum, a certain amount of fermentation residues from the old biogas digester can be added.
The methods of cultivating human, poultry and manure are solved.
To prepare 1000 kg fermented inoculum,
Generally 400 kg of biogas fermentation broth and 600 kg of livestock and poultry manure are added, mixed, stacked in a water-proof pit and sealed with a plastic film. After 7 days, they can be used as an inoculum; if there is no biogas fermentation broth, you can use In the rural area, 500 kilograms of sludge that has not been moved for a long time is added, and 500 kilograms of livestock and poultry manure is added. The mixture can be used after being stacked for more than 7 days.
Fourth, prevent the entry of external water
We must do everything possible to prevent external water from flowing into the digester, so as not to reduce the feed concentration and the temperature in the tank.
5. Adjust the pH of the biogas fermentation broth in the pool to test its pH with a pH test paper.
When the PH value is less than 7, use 1% lime water (used with caution to prevent partial alkali) to slowly adjust the pH to between 7-7.5 to meet the requirements of fermenting bacteria.
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