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The sewage from the farms also seriously pollutes the environment. The sewage and feces have typical “three highs” characteristics, namely high concentration of organic matter, high ammonia nitrogen and high suspended solids. It also contains a large amount of bacteria, ammonia nitrogen, and organic phosphorus. Direct discharge of sewage containing pollutants into the natural environment will cause damage to the ecological environment. Before being discharged, sewage needs to be centrally treated and purified to meet the discharge standards before it can be discharged into the natural environment.