Treatment method of high-acidity high-salinity copper-containing organic wastewater

Abstract

The invention discloses a treatment method of high-acidity high-salinity copper-containing organic wastewater. The method includes: (1) iron displacement, to be specific, adding excessive scrap iron or scrap iron alloy in an iron replacement reaction tank to replace and recycle copper and remove acidity; (2) evaporative concentration, to be specific, after the mixed liquor stands and precipitates, subjecting supernate to MVR (mechanical vapor recompression) evaporative concentration and crystallization to obtain NaCl and Na2SO4 white crystal; (3) performing Cl2 oxidation, to be specific, reacting residual liquor with Cl2 in an oxidation reactor after evaporation so that Fe<2+> is oxidized into Fe<3+>, and cooling to obtain FeCl3.6H2O, wherein organics in residual liquor are oxidatively degraded partially; (4) treating with distilled water, to be specific, degrading distilled water via chemical oxidation COD by 70%-85% with BOD / COD>0.3, performing biochemical treatment on COD by means of SBR (sequencing batch reactor), contact oxidation and the like, and then performing activated carbon adsorption and ozonation to ensure that COD reaches the standards. The method is applicable to the treatment and recycling of copper replacement acid water produced in the saccharin production process.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a treatment method for high-acidity and high-salinity copper-containing organic wastewater. Background technique [0002] In the production process of sodium saccharin, the replacement cupric acid water is produced, which contains high acidity, high salinity, high concentration of refractory organic matter, and Cu 2+ of industrial wastewater. It contains 13%~15% acidity (mainly HCl), about 7% NaCl, Na 2 SO 4 Content about 2%~3%, Cu 2+ 4000~5000 mg / L, COD 20000~25000 mg / L, the organic components mainly include benzene, toluene, xylene, methyl terephthalate, etc. The direct discharge of the wastewater will pose a major hazard to human health and the natural environment, and the copper ions and hydrochloric acid contained in the wastewater will cause a waste of resources. Therefore, necessary measures must be taken to treat the wastewater. [0003] At...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the low recovery rate of copper in the replacement of copper acid water in the current saccharin plant, the residual Cu 2+ If it is too high, it will inhibit the toxicity of microorganisms and affect the standard discharge of COD in the comprehensive sewage treatment station. The present invention provides a method for high-acidity and high-salinity copper-containing organic wastewater that can realize the discharge of wastewater up to the standard, and at the same time realize resource recovery of copper and FeCl. 3 processing method

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