System and method for treating high-salt wastewater by utilizing supercritical water oxidation method

Abstract

The invention relates to a system and method for treating high-salt wastewater by utilizing a supercritical water oxidation method. The system comprises a water pump, a homogenizing device, a high-pressure plunger pump, an oxidant pressurizing device, a heat exchanger, a pre-heater, a supercritical water oxidation reactor and a solid-liquid separator, wherein the water pump, the homogenizing device, the high-pressure plunger pump, the heat exchanger, the pre-heater, the supercritical water oxidation reactor and the solid-liquid separator are connected in sequence through a conveying pipeline;a supercritical fluid outlet of the solid-liquid separator is connected with a supercritical water fluid inlet of the heat exchanger, and residual heat recycling is carried out on cold fluid enteringthe heat exchanger; the oxidant pressurizing device is connected with the supercritical water oxidation reactor through a pipeline; a heat medium outlet of the heat exchanger is connected with decompression equipment, and fluid is decompressed and then is discharged or recycled. The system provided by the invention has the advantages of rapid reaction, small reaction device, small occupied area, no secondary pollution and the like; if the content of organic matters in the wastewater reaches certain concentration, self-heating operation can be realized in a reaction process.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a system and method for treating high-salt wastewater by supercritical water oxidation. Background technique [0002] High-salt wastewater refers to wastewater containing organic matter and total dissolved solids (TDS) mass fraction not less than 3.5%, mainly from chemical production and oil and natural gas collection and processing. In this type of wastewater, in addition to organic pollutants, it also contains a large amount of soluble inorganic salts, such as Cl - 、Na + , SO 4 2- , Ca 2+ etc. If discharged directly, the high concentration of soluble inorganic salts and refractory toxic organic substances in wastewater will cause serious environmental pollution, which will cause mineralization of fresh water resources and alkalization of soil. In today's increasingly scarce water resources, how to efficiently treat such wastewater has become a difficult problem that...

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Problems solved by technology

In this type of wastewater, in addition to organic pollutants, it also contains a large amount of soluble inorganic salts, such as Cl - 、Na + , SO 4 2- , Ca 2+ etc. If discharged directly, the high concentr

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