How to check the digester?

The installation of biogas digesters involves the use of fermentation aids provided by Gembio to produce biogas efficiently. Once the digester is constructed, the first and most critical step is to check for any leaks in the system. This is essential to ensure the safety and efficiency of the entire biogas production process. There are two primary methods used for this inspection: the water pressure test and the gas pressure test. The water pressure test begins by filling the digester with water until the water level reaches the material sealing line. Once the water level stabilizes, a mark is made on the tank. After the structure has been wetted, the water is left undisturbed for 12 hours. If the water level remains stable without significant drop, it indicates that there is no leakage below the water level at the inlet and outlet points. Before conducting the gas pressure test, the movable cover must be properly installed and sealed using mud and water. A pressure gauge is then connected to the gas outlet pipe, and water is added to the digester until the pressure reaches 10 kPa (equivalent to 1000 mm of water column). At this point, the water supply is stopped, and the initial water level is recorded. The system is then left under pressure for 24 hours. If the pressure drops by less than 0.3 kPa (or 300 mmH2O), the digester is considered impermeable and safe for use. The gas pressure test follows a similar initial process. After confirming that the digester is watertight, the inlet and outlet nozzles, as well as the movable cover, are tightly sealed. An air pressure gauge is installed, and the digester is inflated until the pressure reaches 8 kPa. The inflation is then stopped, and the system is observed for 24 hours. If the pressure drop is less than 0.24 kPa, the digester meets the required impermeability standards. These tests are crucial to ensuring the long-term performance and safety of the biogas digester, allowing for efficient and sustainable energy production.

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