System and method for synchronously treating copper-containing wastewater and organic wastewater

Abstract

The invention discloses a system and a method for synchronously treating copper-containing wastewater and organic wastewater. The system comprises a membrane concentration system A, an electrolytic copper device, a reaction tank, a filter pressing device, a pH regulating tank, a sedimentation tank, an intermediate water tank, a freezing crystallization device, a resin adsorption device, a membraneconcentration system B and an MVR evaporation system which are connected in sequence, wherein the membrane concentration system A is connected with the intermediate water tank through a pipeline. According to the system, the copper-containing wastewater and the organic wastewater can be subjected to split-flow treatment; for the high-concentration copper-containing wastewater, a membrane concentration technology-electrodeposition technology is adopted to recover most of copper ions; for organic wastewater, o-aminobenzoic acid in the organic wastewater is recovered through separation and precipitation; and for comprehensive wastewater obtained by mixing the two strands of pretreated wastewater, through freezing crystallization and MVR evaporation, mirabilite and other crystalline salts arerecovered, and meanwhile, it is ensured that condensed water obtained after MVR evaporation can meet the water inlet requirement of a subsequent sewage plant, and advanced treatment is carried out.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to a system and method for synchronously treating copper-containing wastewater and organic wastewater. Background technique [0002] At present, the main method of wastewater treatment in fine chemical production enterprises is to pretreat each strand of wastewater to remove pollutants, and then mix them for advanced treatment. Among them, for the wastewater containing heavy metal ions, the method of coagulation and precipitation can be used to remove the heavy metals. This method is simple in process and low in investment and operation costs, but there are still many defects, especially when the concentration of heavy metals is relatively high. The amount of chemicals used is large, and the amount of subsequent sludge generated is large, resulting in high subsequent disposal costs; for organic wastewater, conventional advanced oxidation methods, including ozone aeration...

AI Technical Summary

Problems solved by technology

Among them, for the wastewater containing heavy metal ions, the method of coagulation and precipitation can be used to remove the heavy metals. This method is simple in process and low in investment and operation costs, but there are still many defects, especially when the concentration of heavy metals is relatively high. The amount of chemicals used is large, and the amount of subsequent sludge generated is large, resulting in high subsequent disposal costs; for organic wastewater, conventional advanced oxidation methods, including ozone aeration oxidation, hydrogen peroxide oxidation, Fenton oxidation, etc., can be Convert macromolecular organic pollutants into small molecular organics and CO 2 , but the single advanced oxidation method has priority in oxidation efficiency, which makes the mixed wastewater still contain high COD content, which increases the burden of subsequent biochemical treatment, and even leads to substandard effluent

[0003] It can be seen that no matter it is the coagulation sedimentation method or the advanced oxidation method, the removal efficiency of pollutants is limited, and the treated wastewater is difficult to meet the water intake requirements of the subsequent advanced treatment system, and the useful substances in it cannot be recovered, resulting in an extreme waste of resources. big waste

Images