1. Fermentation Method: Most rural biogas digesters use a semi-continuous fermentation process. This means that once the digester starts producing gas normally, new organic materials are added gradually over time, rather than in fixed quantities. The feeding is often based on other factors, such as the availability of farm fertilizers, and is not strictly measured. Depending on whether crop straw is used as a raw material, there are two main types of processes: the straw-based biogas fermentation method and the non-straw biogas fermentation method. When using straw, it's usually cut into smaller pieces and stacked before being added to the digester. Adding a small amount of "Jinbok" biogas starter can help speed up the fermentation process.
2. Inoculum: Biogas production relies on a specific quantity and type of microorganisms. Inoculum refers to the sludge rich in these beneficial microbes. Adding a biogas starter at the beginning of the process helps the system start more smoothly and increases both the rate and volume of gas production. It's especially useful when setting up a new digester or restarting after a period of inactivity.
3. Fermentation Inhibition: If the gas production drops significantly, you might notice a white film forming on the surface of the liquid inside the digester. The biogas may burn poorly, and sometimes it's hard to ignite. Common causes include: 1) Feeding too much material at once, especially if large amounts of chicken manure or human waste are added all at once. 2) Toilet water accidentally entering the digester. 3) Antibiotics present in the feed, which can enter the system through feces and inhibit microbial activity. To address this, first, stop feeding immediately and try to identify the cause. Then, stir the contents of the digester and observe for 1–2 days to see if it recovers on its own. If not, consider adding a biogas starter or taking some inoculum from a healthy digester and mixing it into the current one. Stir thoroughly to ensure even distribution.
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Shaanxi Changsheng Industrial Co., Ltd. , https://www.cncsbio.com