After some time in a rural household biogas digester, certain raw materials may float due to buoyancy, forming scum and eventually creating a hard crust on the surface. This buildup can block the accumulation of biogas, reduce the effective volume of the digester, limit the gas storage space, lower the efficiency of raw material utilization, and ultimately decrease gas production. In severe cases, thick crusts can turn a well-functioning digester into a "diseased" or "waste" tank.
There is a simple and effective way to address this issue. When biogas production drops during winter, you should first empty all the biogas from the digester by opening all the valves, putting the system under zero pressure. Then, disconnect the biogas hose from the air pipe and let the natural gas produced daily vent into the atmosphere. Next, continue adding water to fill the digester completely, then stop the system for 5–7 days, allowing it to "rest."
During this rest period, the floating sludge on the top will be soaked in the slurry below. Under constant pressure, the accumulated sludge will gradually sink and settle at the bottom. Once settled, the sludge can be automatically removed using the digester’s built-in discharge system.
When performing this operation, there are a few important safety precautions to follow:
1. During the rest period, avoid using open flames near the digester’s outlet or testing for fire, as this could cause an explosion.
2. At the same time, conduct a full inspection of all cover plates and the gas distribution system. Repair or replace any faulty parts to ensure the safe and efficient operation of the biogas tank.
This method not only helps maintain the performance of the digester but also extends its lifespan, ensuring more consistent and reliable biogas production over time.
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