Large-scale pig farming has many of its benefits and has become a trend now and in the future. There are also some problems in large-scale farming that have been plaguing everyone. How to deal with pig excrement is an urgent problem to be solved. The general method is to apply fertilizer to the field, but storage and transportation are also a problem, especially in rainy days. It is even more stinky. A pig manure and urine power generation technology can solve the above problems well, and can reduce the operating cost of the enterprise. It is a good thing. The technology is being further promoted. The practice is to ferment the pig's excrement to produce biogas, use biogas to generate electricity, and generate electricity from the excrement produced by the pig farm that raises 20,000 pigs to meet the needs of the farm. You can save tens of thousands of dollars in electricity bills every month. The fermentation residue can be processed to produce organic fertilizer. The treatment of the fermentation residue is preferably carried out by flocculation using an organic flocculant (cationic polyacrylamide), and a polyacrylamide having a relatively high ionicity is generally used. The centrifuge or the filter press is used for dehydration treatment. After the above treatment, the moisture content of the residue is already low. After drying, it can be air-dried and used for fertilizer processing. The water can also reach the discharge standard. Reproduce or irrigate farmland.