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Biogas digester should pay attention to what issues?
A watertight and leak-free biogas digester must be carefully managed during startup to ensure efficient and long-term operation. Here are the key factors to consider:
First, it's essential to have enough inoculum. Before starting a new digester, collect sludge and biogas from old digesters, black sediment from the bottom of pits, pond sludge, or sludge from urban sewage ditches. Also, wastewater and sludge from food processing plants, wineries, and slaughterhouses can serve as excellent sources of biogas-producing bacteria. These materials should make up 10% to 30% of the total fermentation material. Mix them thoroughly with the organic feedstock and add them into the digester. Water used for the process can include biogas fermentation broth, domestic wastewater, river water, or pond water. While well water is acceptable, tap water should be avoided due to its chlorine content, and industrial wastewater containing toxic substances must not be used.
Second, maintaining the right temperature is crucial. Biogas digesters operate efficiently within a temperature range of 10°C to 60°C. The higher the temperature, the faster gas production occurs. Therefore, it’s best to start the digester between April and October when temperatures are more favorable.
Third, pH balance plays a vital role. The ideal pH range for biogas microorganisms is neutral to slightly alkaline (between 6.5 and 7.5). Too acidic or too basic conditions can inhibit microbial activity and reduce gas output.
Fourth, the loading rate should be appropriate. For rural biogas digesters, the dry matter concentration of the feedstock should ideally be between 6% and 12%. If the concentration is too high, it may lead to incomplete digestion and acid accumulation, which hinders gas production. If it's too low, the organic content per unit volume decreases. It's recommended to start at a lower load (below 6%) and gradually increase it once gas production stabilizes.
Fifth, proper water management is important. During startup, a large amount of water is added—about 5/8 of the digester’s effective volume. The temperature of this water significantly affects the success of the startup. Ideally, the initial water temperature should be above 20°C. In colder seasons like autumn or winter, the water temperature inside the tank should be kept above 35°C to support microbial activity.
Lastly, sealing the movable cover properly is essential. The clay used to seal the cover should be neither too hard nor too soft, and it must completely fill the gap between the cover and the opening. The water ring around the cover should be regularly filled with water to prevent the sealant from drying out and cracking, which could cause leaks.
What exactly is a biogas inoculum? Simply put, it refers to anaerobic activated sludge that contains a high concentration of biogas-producing microorganisms. Common sources include sludge from old biogas digesters, black sediment from biogas slurry, excreta pit sediments, pond mud, and urban sewage ditch sludge. Additionally, wastewater and sludge from food factories, wineries, and slaughterhouses are also rich in these beneficial microbes and can serve as effective inoculants.