The fermented biogas slurry of pig manure is rich in three fertilizer elements, namely nitrogen, phosphorus and potassium, and trace elements, such as calcium, magnesium, sulfur, iron, boron, manganese, copper, zinc and chlorine. It also contains 17 kinds of amino acids, humic acid, gibberellin, indoleacetic acid, zeatin and other bioactive substances, and the content of volatile organic components and toxic heavy metals is very low, which does not exceed the irrigation water quality of farmland. At the same time, biogas slurry is a quick-acting, clean and safe organic fertilizer. Benefits of biogas slurry 1. Watering vegetables: biogas slurry is rich in high-quality organic fertilizer and contains nutrients needed by various vegetables. No matter what kind of vegetables are used for watering, they are safe and effective. The fermented biogas slurry can be directly applied without any other treatment. Not only is the vegetable delicious, but also there are few pests and diseases, and the yield is high. It is a high-quality pollution-free vegetable.

2. Soaking seeds: Soaking seeds with biogas slurry can stimulate the activity of enzymes in seeds, promote embryo cell division and stimulate growth. Improve germination rate, seedling rate and subsequent growth. Especially when we sow seedlings, as long as there is enough, there is no need to add other fertilizers at all.

3. Prevention of freezing injury: biogas slurry can be used not only for vegetables, but also for fruit trees. Spraying the screened biogas slurry on fruit tree seedlings can obviously improve the frost resistance of fruit tree seedlings.

4. Reduce the cost: The nutrient elements contained in the biogas slurry are enough to cope with the lack of fertilizer for various vegetables and fruits, so farmers can greatly reduce the money for purchasing chemical fertilizers, and they can grow good vegetables without spending money, killing two birds with one stone.

Substitution of pig manure after passing through fermentor; Biogas digesters are built in rural areas, not only pig farms, but also every household with pigs at home. Biogas pit is not only a benefit of fermenting biogas slurry to grow vegetables, but also can produce biogas after closed fermentation of pig manure, which can solve the problem of household fuel. Biogas produced by rural household biogas digesters is mainly used as domestic fuel. For example, a family of 3-5 people puts in the feces of 4 pigs for fermentation every day, and the biogas generated can solve the fuel problem of lighting and cooking in a family.

At the same time, the use of biogas digesters is also beneficial to rural health work. After the biogas digester is completed, the human and animal manure is put into the biogas digester for closed fermentation, and the parasitic eggs in the fermented manure can be reduced by about 95%, which is beneficial to control and eliminate parasitic diseases and do a good job in rural disinfection and sterilization. Farmers use biogas to get rid of the traditional cooking methods and greatly improve their health and living environment. Using biogas as power fuel is clean, pollution-free, convenient to prepare and low in cost, which is more conducive to protecting the ecological environment.