The process of water and wastewater treatment is usually a combination of unit technologies such as pollutant conversion, enrichment and separation. For biodegradable organics, conventional treatment processes often include a series of chemical and physicochemical units, such as oxidation, coagulation and precipitation (for heavy flocs) or air flotation (for light flocs) facilities, as well as additional units to enhance separation efficiency, resulting in long treatment processes, high energy consumption and poor process adaptability. Innovation in the transformation of pollutants concentration - separation process coupling, the project established a new technology of the integration of multiple coupling ozone gas floating system, realizing the technology and equipment, and successfully applied in the oil and gas field sewage treatment and resource recovery, printing and dyeing wastewater treatment and recycling, urban rain water depth treatment.