The reason why kitchen wastewater can't be discharged into the sewer normally is mainly because it contains animal fat, and vegetable oil won't scale and block the sewer. However, animal fat will precipitate over time, which is easy to cause scaling and blockage of sewers, and the scaling and hardening of oil is very serious. The traditional practice is that kitchen catering grease passes through the grease trap, but the grease trap will need to be cleaned regularly, which is sour and smelly. At present, the latest solution is to use green future biological degreasing bacteria to decompose oil into fatty acids.