10 advanced technologies in the water treatment industry

10. Supercritical water oxidation (scwo) technology

SCWO uses supercritical water as medium to decompose organic matter by homogeneous oxidation. Organic pollutants can be decomposed into small inorganic molecules such as CO2 and H2O in a short time, while sulfur, phosphorus and nitrogen atoms are converted into sulfate, phosphate, nitrate and nitrite ions or nitrogen, respectively. The United States lists the SCWO process as the most promising waste treatment technology in the field of energy and environment.

SCWO has fast reaction rate and short residence time. High oxidation efficiency, most organic matter treatment rate can reach more than 99%; The reactor structure is simple and the equipment size is small. Wide range of treatment, not only can be used for a variety of toxic substances, wastewater, waste treatment, can also be used to decompose organic compounds; No need for external heating, low processing cost; Good selectivity, by adjusting the temperature and pressure, can change the density of water, viscosity, diffusion coefficient and other physical and chemical characteristics, so as to change its solubility of organic matter, to achieve the purpose of selective control of reaction products.

The supercritical oxidation method has been applied in the United States, Germany, Sweden, Japan and other European and American countries, but the research in China started late and is still in the laboratory research stage.