What are the process technologies suitable for rural domestic sewage treatment equipment?

The increasing number of rural domestic sewage treatment equipment has become an important measure for ecological environment protection, sewage treatment, and water quality purification. So what is the process technology suitable for rural domestic sewage treatment equipment?
Rural domestic sewage treatment is the process of removing and degrading harmful substances and environmental pollutants from rural domestic sewage for harmless treatment. Rural domestic sewage treatment should focus on selecting mature, reliable, suitable for rural characteristics, and applicable technologies for actual domestic sewage treatment. At present, there are many treatment technologies used for rural domestic sewage treatment both domestically and internationally, and their names are also diverse. However, they can usually be divided into two categories based on process principles: the first category is natural processing systems. The second type is biological treatment systems, which can be divided into aerobic biological treatment and anaerobic biological treatment.
Underground soil infiltration purification system.
Several or more dispersed households are suitable for underground soil infiltration purification systems. The underground soil infiltration purification system is a new small-scale sewage purification technology based on the principles of natural ecology, which has engineering and practicality. It is 50 centimeters deep and has good diffusion characteristics in the soil layer. The sewage discharged in batches slowly passes through the gravel layer around the water distribution pipe and spreads to nearby soil layers under the action of soil capillaries. There are a large number of microorganisms in the surface soil, and the root zone of crops is in an aerobic state. Pollutants in sewage are filtered, adsorbed, and degraded.
Aerobic biological treatment system.
Aerobic biological treatment system is currently the most commonly used treatment process in rural domestic sewage treatment equipment. There are many aerobic biological treatment processes, each with its own advantages and disadvantages. When making a choice, it is necessary to carefully argue and compare based on the actual situation, and pay attention to economic applicability. Biological treatment method is to supply oxygen to sewage through equipment such as fans, cultivate biological strains and microorganisms, and decompose most of the organic matter in sewage into pollution-free substances such as carbon dioxide and water, and synthesize a small part into cellular substances, promoting microbial growth and discharging it as residual sludge, so as to purify and discharge the sewage.
Anaerobic biological treatment system.
There are currently some technical issues with anaerobic biological methods, mainly manifested in low biological treatment efficiency, especially low nitrogen and phosphorus removal rates, which to some extent limit their application.