Study on constructing methods of cleaning biogas digesters for the life sewage at high underground water level

On the basis of our constructing experience and research in recent years,three methods are set forth respectively and explained simply about constructing cleaning biogas digester for the life sewage at high underground water level. These methods are different in drainage methods, the first method is to drain sewege water through deep well, the second through facility well, the third through understraturn-connecting well.