High groundwater level to build biogas digester operation technology

After the drainage and pouring pond pit is excavated to the required standard, the water inside the pit is first drained. Then, the pool wall formwork is set up for the pouring of the pool wall. During the concrete pouring process, pumping continues until the wall solidifies, at which point the pumping stops. After 3 to 5 days, the formwork on the walls is removed. Next, the bottom of the pool is pumped to remove any remaining water. Since a significant amount of water tends to seep into the bottom, it's important to dig the base in the shape of a pot. The depth of the pot-shaped bottom should be between 35 to 45 cm. In the center of this area, a hole with a depth of 35 cm and a diameter of 20 cm is dug. A PVC pipe, approximately 35 cm long and 7.5 cm in diameter, is placed into this hole. The self-priming pump hose is then inserted into the PVC pipe to continue removing water. Once the bottom is completely dry, a layer of stones about 2 to 3 cm thick is laid down, followed by a 10 cm thick layer of evenly poured concrete on top. After the PVC pipe is removed, the bottom of the pool is leveled and the surface is milled. After 16 to 18 hours, once the concrete has hardened, a layer of plaster is applied to the inner walls, including the bottom of the pool. Then, the walls and bottom are painted and coated with 1 to 2 layers of mortar. The next day, the pumping is stopped. Before sealing the PVC outlet, you need to prepare a good plastic film with a diameter of about 20 cm, a round stick with a diameter slightly less than 7 cm, and several pieces of old cotton. The old cotton is wrapped in the plastic film to form a ball that is slightly larger than the PVC nozzle. Once the self-priming pump tube is pulled out, the wrapped cotton ball is immediately placed into the top of the PVC nozzle and pressed down using the round stick until it reaches a thickness of about 5 to 7 cm. The remaining part of the tube is quickly filled with a small amount of powdered flour and compacted against the cotton ball. The flour is then tamped down with a wooden stick until it is level with the surface of the pool bottom. After the PVC nozzle is sealed, check for any signs of water leakage at the bottom and walls of the tank. If there is any seepage, use iron tools to create small holes in the affected area and fill them with dry powder, compacting them thoroughly. By following these steps carefully, a biogas tank can be successfully constructed in a courtyard located in an area with a high groundwater table. This method ensures proper drainage, structural integrity, and long-term performance of the tank.

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