According to the need of fertilizer, batch fermentation digesters can be reloaded 1 or 2 times a year. Large refueling should be carried out at a pool temperature of 15°C or more. Pool temperature and air temperature below 10°C are not suitable for large refueling because the biogas digesters are difficult to start under low temperature conditions. The following points should be made when reloading: 1. Prepare enough new material before discharging and start the digester immediately after discharge. (2) Remove any impurities that are difficult to digest or deposited sediment during discharging. 3 Biogas digesters should retain 20% to 30% of active sludge and feed fluid containing biogas bacteria as an inoculum. (4) In the case of debris in the large refueling cleaning tank, debris in the sinking, etc., or maintenance of the digester after large discharge, all flaps should be opened to allow air to circulate, and if it is not proved that the tank is safe by animal experiments , does not allow the next pool operation. Operators in the pool must not use open fire lighting and are not allowed to smoke in the pool. Under the pool maintenance is not allowed single operation, the pool staff should be tied to the safety rope, the pool should have special guardianship, in case of accidents can be rescued in a timely manner. The mixed fermentation raw material digester is completely recharged once before entering the winter, and new materials are added to ensure the nutrients needed for winter fermentation and increase the winter production of biogas digesters. The large refueling should be stopped 15 to 20 days in advance, and the other requirements are the same as those for the large batch refueling digester.
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