A method for advanced treatment and desalination reuse of high-salt industrial wastewater

Abstract

The invention relates to the technical field of industrial wastewater treatment. The method for the advanced treatment and desalination reuse of high-salt industrial wastewater of the present invention comprises the following steps: 1) using high-efficiency coagulation treatment of high-salt industrial wastewater to obtain a supernatant; 2) using the supernatant obtained in step 1) , remove high-valent ions above divalent in the wastewater by chemical precipitation; 3) take the supernatant after step 2) chemical precipitation and use ozone catalytic oxidation treatment; 4) process the wastewater after step 3) ozone catalytic oxidation through multi-media filtration in turn , precision filtration and membrane filtration treatment; 5) process the water effluent from membrane filtration in step 4) through inverted electrode electrodialysis. The present invention utilizes the coupling and synergy of different unit technologies to remove organic matter, bacteria, colloids, particle suspensions, Ca 2+ and Mg 2+ And high-valent ions, and other soluble inorganic salts, etc., to achieve advanced treatment and desalination reuse of high-salt industrial wastewater.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment technology, in particular, the invention relates to the realization of advanced treatment and desalination reuse of high-salt industrial wastewater through the coupling and synergy of physicochemical methods and membrane technologies. Background technique [0002] High-salt industrial wastewater refers to wastewater with a total salt content of more than 1%. High-salt industrial wastewater is produced in a wide range of ways, and the amount of water is increasing year by year. It mainly comes from production and processing industries such as iron and steel, coal chemical industry, textile, papermaking, oil and natural gas. This wastewater contains a variety of substances (including inorganic salts, oil, organic matter and heavy metal ions, etc.). According to different production processes, the chemical composition, types and properties of organic matter in high-salt industrial wast...

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Problems solved by technology

Among them, the thermal concentration process is to use thermal energy to concentrate the solid in the liquid state at a high rate, which generally has the problems of large equipment and high energy consumption, and the corrosion of the equipment by chloride ions and the scaling of calcium and magnesium ions in the process of thermal concentration of wastewater will cause maintenance costs. High, and increase the investment and operation risk of the enterprise; such as chemical precipitation method used to remove Ca in wastewater 2+ , Mg 2+ and other high-valent ions, but it has no effect on other soluble inorganic salts; the ion exchange method is only suitable for low-concentration saline wastewater, and the treatment of high-saline industrial wastewater will cause the ion exchange resin to quickly saturate and need to be regenerated repeatedly, which also produces secondary Wastewater; the problems of reverse osmosis in the treatment of high-salt industrial wastewater are that high reverse osmosis pressure will lead to increased energy consumption, low concentration will lead to large discharge of concentrated water, and serious membrane pollution; electrodialysis is used in industrial The main problem in wastewater desalination is due to Ca 2+ , Mg 2+ Membrane fouling caused by ion scaling and organic matter adsorption on the membrane surface makes it difficult for the electrodialysis system to operate stably for a long time

There are also several reports on patents on reverse osmosis, electrodialysis, etc. used in the treatment of saline wastewater. Due to the high content of organic matter and impurities in high-salt industrial wastewater, it will lead to serious membrane pollution in the water treatment process.

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