1. Frequent discharge
The fermentation residues in the tank should be drawn out in time, and the principle is “how much to take out, how much to go in, and insist on going out first and going in later.” After the residual material is drawn out, the liquid level of the material in the pond cannot be lower than the upper edge of the inlet and outlet pipe openings, so that the methane in the pond is prevented from running away from the inlet and outlet pipes. After discharging, new materials should be added in time. If the raw materials for one fermentation are insufficient, urea (carbon ammonia) and water can be added, and the original water level should be maintained to make the biogas in the pond under pressure. The refueling of the biogas digester is generally carried out once a year, and should be arranged in midsummer or autumn. Feeding should be stopped 20-30 days before the major refueling to avoid wasting raw materials. After the large discharge, sufficient new material should be added in time so that the biogas digester can be restarted quickly.
2. Frequent feed
To provide sufficient fresh raw materials for the biogas bacteria, so that the biogas bacteria can carry out normal metabolism and maintain a strong gas production effect, it is necessary to continuously supplement the fermentation raw materials. The interval and quantity of feeding materials should be determined according to the type of household ponds in rural areas. Generally, a side water pressure type biogas digester of 8 cubic meters must be fed once every 7-10 days, and the amount of feeding shall be controlled at two each time. Around the pig unit, it can also be calculated based on 2-3 kg of dry matter for every cubic meter of biogas produced. For the “three-in-one” biogas digester in the biogas enclosure, human and animal manure and urine flow into the tank automatically every day. Therefore, it is necessary to add an appropriate amount of water at ordinary times to maintain the concentration of the fermentation raw materials in the tank.
3. Stir frequently
This is a good measure to improve the gas production rate. If it is not stirred frequently, the scum layer in the pool will form a thick crust and the sedimentation layer will accumulate thicker and thicker, preventing the biogas produced in the lower layer from entering the gas box and affecting it. Fermentation of raw materials reduces gas production. Biogas digesters generally do not have a stirring shell breaking device. You can stir from the water pressure room, or take out several barrels of fermentation liquid from the water pressure room, and then pour it in from the feed port to achieve the function of stirring the fermentation raw materials in the biogas tank.
4. Regularly adjust the water volume of the biogas digester
Too much or too little water in the biogas digester is harmful to the activity of biogas bacteria and the production of biogas. It is generally required that the concentration of biogas digesters be maintained at about 6% in summer and 10% in winter. If the water content is too much, the dry matter content in the fermentation broth is small, and the gas production per unit volume is less; if the water content is too small, the fermentation broth has a higher concentration, and a large amount of organic acid produced by fermentation is easy to accumulate, and the upper layer of the tank is easy to crust at night. , So that fermentation is blocked, gas production is affected, and PH value drops.
Fifth, do a good job in winter warming and heat preservation
Before the winter, you should add more easily fermentable raw materials, such as cow dung, chicken and duck dung, etc. At the same time, it is necessary to use solar energy and timely cover the insulation film. In the severe winter, straw curtains are added to the greenhouse before sunset. If it is an open-air biogas digester, thicker coverings should be placed on the main tank, such as stacking crop straw or composting to increase the temperature of the pool.
Post time: Sep-06-2021