Rural sewage treatment complete equipment

What are the treatment methods for rural sewage treatment equipment? There are the following:
1. Septic tank: This method mainly removes suspended pollutants from sewage and stores and digests the sludge at the bottom of the tank for easy cleaning and treatment. After the domestic sewage flows into the septic tank, it takes several hours to settle and remove 50% to 60% of the paper scraps, feces, pathogens, and bacteria from the sewage. When the sludge settles in a closed anaerobic or hypoxic environment, it can decompose and decompose, transforming organic matter into a stable state. After three months of acidic fermentation, dehydration, and maturation, it becomes fertilizer.
2. Biogas purification tank: This method involves placing organic substances such as weeds, straw, garbage, human and animal feces, and sewage into a closed device, and then decomposing and metabolizing them through a large number of microorganisms with diverse types and functions to form biogas. This type of bioenergy has various advantages such as renewability, cleanliness, and affordability. Moreover, the purification tank can be buried underground and occupies a small area, making it easy to maintain and manage.
3. Underground unpowered sewage treatment equipment: This technology applies various traditional theories and mature technologies such as anaerobic digestion and aerobic degradation, biofilm method, etc., effectively purifying sewage and feces. This method has good sewage treatment effects, but the water quality cannot meet relevant standards. It is only suitable for use in areas with poor economic foundation, incomplete drainage network, no sewage treatment plants or service coverage.