A combined system of advanced oxidation-separation crystallization for high-salt industrial wastewater

Abstract

The invention provides an advanced oxidation-separate salt crystallization combination system and technique of high-salt-salt industrial wastewater, relating to the technical field of water treatment. The technique comprises the following steps: sending high-salt-salt industrial wastewater treated by a pretreatment membrane system into an ozone advanced oxidation device, and standing in the presence of an ozone catalyst at the ozone specific loss of 1.2-3.0 kg O3 / kg COD (chemical oxygen demand) for 2-4 hours, wherein the COD of the treated effluent water is less than 50 mg / L; and sending into a crystallizing system to carry out crystallization treatment, wherein sodium sulfate concentrated water enters a refrigerating crystallizing system, and sodium chloride concentrated water enters a multi-effect evaporation (or MVR (mechanical vapor recompression) evaporation) device. The technique greatly lowers the wastewater COD content, increases the crystal salt purity, has the characteristics of simple operation, low cost, high water treatment quantity, high adaptability and stable water quality, and reduces the blockage problem of the crystallizing equipment.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to an advanced oxidation-salt separation and crystallization combination system of high-salt industrial waste water and a production process using the system, especially the high-salt and high-COD comprehensive waste water produced in the coal chemical production process . Background technique [0002] my country is a big country in coal production and consumption. In the process of coal chemical production and processing, due to the different properties of raw coal, different production products and different processing techniques, the coal chemical wastewater produced has the characteristics of complex composition, high salt content, and difficult biochemical degradation, which has become a difficult problem in industrial wastewater treatment. The problem. In addition, in recent years, the "National Environmental Protection "Eleventh Five-Year" Plan" and "National Environmenta...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the incomplete removal of organic matter after the existing biochemical treatment, and the concentration of organic matter greatly increases after the deep concentration of the membrane concentration system in the high brine treatment process. At the same time, the oxidation effect of the existing treatment process is not ideal, and the oxidation of organic pollutants Insufficient thoroughness, low purity of industrial salt obtained, etc.

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