The food industry includes meat processing, aquatic product processing, dairy processing, canned food production, brewing, sugar making and many other industries. Therefore, the food industry has a wide range of raw materials and a wide variety of products, and the amount and quality of discharged sewage vary greatly. However, in general, food sewage basically has strong oxygen consumption, and a large amount of suspended matter is discharged with the wastewater. Since most of the raw materials used in the food industry are organic substances that can be digested by the human body, the biodegradability of food industry sewage is generally good.