Green high-efficiency pollutant supercritical water oxidization method

Abstract

The invention relates to a green high-efficiency pollutant supercritical water oxidization method, belonging to the fields of environmental protection and chemical industry. The method comprises the following steps: (1) adding pollutants into a storage tank, stirring, and adding red mud solid into the storage tank to prepare a suspension of red mud and pollutants in a mass ratio of (0.05-0.4):1; (2) preheating the suspension to 150-300 DEG C, directly pumping the suspension into a supercritical water oxidization reactor, and meanwhile, pumping a strong oxidizer into the supercritical water oxidization reactor; (3) introducing the reacted liquid into a series-connected two-stage or more-stage solid separator to perform gradient separation on the solid; (4) regulating the temperature and pressure of the separated fluid; and (5) directly discharging the liquid subjected to gas-liquid separation, and introducing the gas into a series-connected two-stage or more-stage red mud absorption tank. The method implements high-efficiency green operation of the pollutant supercritical water oxidative degradation process, and also implements dealkalization on the red mud, thereby being beneficial to further treatment and recycling of the red mud.

Description

technical field

[0001] The invention relates to a method for synergistic treatment of waste and pollutants, in particular to a green, efficient and harmless treatment of pollutants such as high-concentration biochemically degradable organic waste water and refractory toxic waste by using supercritical water as a reaction medium A method of processing or resource utilization. It belongs to the field of environmental protection and chemical industry. Background technique

[0002] Pollutant supercritical water oxidation technology (SupercriticalWaterOxidation, referred to as SCWO) refers to the use of water in a supercritical state (T = 374.2 ° C, P = 22.1MPa) as a reaction medium to deeply oxidize and degrade organic pollutants into carbon dioxide, water, Inorganic substances such as nitrogen. Because the water in the supercritical state has a series of unique properties such as density, viscosity, dielectric constant, and ion product decrease, hydrogen bond weakening, diffu...

Images