A method for treating acidic industrial wastewater with high sulfate and organic solubility

Abstract

The invention discloses a treatment method for acidy industrial wastewater with high sulfate and organic matter solubility. The treatment method comprises the following steps of: regulating pH of acidy wastewater to 2-5 by NaOH; carrying out aeration air-stripping treatment on the industrial wastewater with pH value regulated under a heating condition, and combustion treatment after collecting air-stripping waste gas; adding active carbon and hydrogen peroxide in the air-stripped wastewater; taking active carbon as a heterogeneous Fenton catalyst to catalyze hydrogen peroxide to degrade residual organic substances in wastewater; filtering out the wastewater with organic substances removed, recycling sulfate in the wastewater by a cooling and crystallizing method, wherein the active carbon can be continuously used for treating the next batch of wastewater. The method disclosed by the invention can realize effective treatment on high-sulfate organic acidy industrial wastewater. Compared with the prior art, the treatment method has advantages of being simple in process and capable of being applicable to treating sulfate organic wastewater different in solubility; the thermal heterogeneous Fenton technology taking the active carbon as the catalyst is free of secondary pollution, and the active carbon can be repeatedly used for times; content of organic substances in the sulfate which is recycled after organic substances are removed is low, and therefore, the treatment method is beneficial to follow-up comprehensive utilization of the sulfate.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for acidic industrial wastewater containing high sulfate and organic matter solubility. Background technique [0002] In recent years, with the rapid development of my country's industry, some chemical, pharmaceutical, papermaking, food, fermentation and other industries have discharged a large amount of high-soluble sulfate organic wastewater into natural ecological water bodies. Excessive sulfate in the water body can not only make the water body smelly and deteriorate the water quality, but also strongly restrict the growth of aquatic organisms and plants, and cause the salinization of the surrounding soil. In short, the pollution of the water body and soil caused by it is becoming increasingly serious and serious. aroused widespread concern. [0003] The difficulty in the treatment of high-sulfate organic wastewater is t...

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Problems solved by technology

General desalination methods such as evaporative crystallization, membrane separation, ion exchange and other technologies generally have problems such as high treatment costs and easy to cause secondary pollution. However, the treatment effect of biological anaerobic digestion technology commonly used at home and abroad is obviously affected by wastewater. Competitive inhibition among various strains and the toxic effect of hydrogen sulfide produced, the actual application effect is not ideal

In order to overcome the adverse effects of the above-mentioned anaerobic digestion, the patent (CN102351381A) entitled "A Treatment Device and Method for Sulfate Wastewater" discloses a combined two-stage anaerobic and cyclic stripping stripping process to treat high-soluble sulfuric acid The device and method of salt wastewater, the disadvantage of this invention is that the hydraulic load is small, the adaptability to water quality is poor, and it is difficult to apply to the organic wastewater treatment of higher sulfate solution, because the solubility of sulfate is higher than 100g / L The organic acidic wastewater, its huge osmotic pressure will lead to the inability of microorganisms to carry out normal metabolism and growth, so the treatment process combining physicochemical and biological methods is being more researched and applied

The advantages of this method are good operability and strong adaptability, but in the case that the organic matter in the wastewater has not been fully degraded, the sulfate recovered by cooling crystallization may contain a large amount of toxic organic matter, and its subsequent comprehensive utilization is difficult. Big security risk

In addition, using the Fenton method to degrade organic matter in wastewater will produce a large amount of iron sludge, which is difficult to dispose of

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