The main source of slaughtering sewage is a series of sewage discharged during slaughter, which is one of the largest sources of organic pollution in China. Including: cleaning after slaughter, disintegration washing, visceral cleaning, ground washing and livestock waste water. The slaughter wastewater mainly comes from the slaughtering and processing of pig and poultry. It has large water volume, deep color and high organic concentration. It contains high concentration of organic matter and is not easy to degrade. It is difficult to handle.

Sewage contains a lot of organic matter, the main components are: animal manure, blood, animal internal organs, animal hair, minced meat and oil. The concentration of suspended solids is high, the concentration of organic pollutants is high, and it has strong odor. Such sewage will be adversely affected if it is discharged directly without treatment.