COD degrading bacteria is mainly used in petroleum and gas refining, petrochemical products and other fields of wastewater, especially coatings, pigments, phenolic resin, rubber, styrene, lubricants and surfactants; Wastewater from tanning, smelting, coking, textile and printing and dyeing; Various food industry and pharmaceutical production enterprises, including cheese, fruit processing, wine making, poultry processing, vegetable oil refining, corn sweetener and starch production; Municipal sewage plants with mixed industrial effluents and landfill leachate treatment.