Method for recycling and comprehensively utilizing reverse osmosis concentrated water produced after treatment of coking wastewater

Abstract

The invention discloses a method for recycling and comprehensively utilizing reverse osmosis concentrated water produced after treatment of coking wastewater. In the steel industry, a widely used reverse osmosis process in a coking wastewater treatment technology can produce 70% of high-quality effluent and 30% of reverse osmosis concentrated water. Pollutants in water are intercepted and concentrated by a reverse osmosis membrane, but the pollutants are not removed, so the pollutants are completely concentrated in the reverse osmosis concentrated water. According to a traditional treatment method for reverse osmosis concentrated water produced after treatment of coking wastewater, reverse osmosis concentrated water is used as slag washing water in the iron and steel industry, and toxic and harmful substances can be volatilized under the action of high temperature, which causes conversion of water pollution into gas pollution and leads to a severe environment of a working site. According to the invention, a combined process of pretreatment (bi-alkali softening, advanced oxidation and ultrafiltration)-electrodialysis-reverse osmosis-bipolar membrane electrodialysis is innovatively adopted to realize zero discharge of coking wastewater.

Description

technical field [0001] The invention relates to the field of waste water resource utilization, in particular to a method for comprehensive utilization of coking waste water reverse osmosis concentrated water resource utilization. Background technique [0002] Coking wastewater usually refers to the general term of wastewater in each section of the coking process. Its main sources are as follows: the water vapor formed by the water precipitated during the pyrolysis of raw coal is formed in the primary cooling section, and the gas generated during the purification process. Waste water produced in the process of washing waste water, recycling tar and crude benzene and other chemical products. Among them, inorganic pollutants mainly include thiocyanate, metal ions and their compounds, ammonia, cyanide compounds, etc., and organic pollutants mainly include various macromolecular organic compounds and aromatic compounds such as phenols. The characteristics of large water volume, ...

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Problems solved by technology

When coking wastewater is used as slag flushing water in the iron and steel industry, toxic and harmful substances are volatilized under high temperature, changing from water pollution to air pollution, making the working environment harsh

The published patent CN103449635A discloses a treatment method for reverse osmosis concentrated water of coking wastewater. The core process of "Fenton oxidation + ion exchange + biochemical treatment + filtration separation" is used to treat reverse osmosis concentrated water. This process can only remove calcium and magnesium ions. And there are pollutants, the salt content of the concentrated water effluent is still too high to be discharged directly, and because the coking wastewater has undergone the previous biochemical treatment process before entering the reverse osmosis, the organic matter content is already very low, and it is no longer suitable for further biochemical treatment.

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