A treatment method and equipment for recycling industrial waste salt

A technology of industrial waste salt and treatment method, which is applied in the field of treatment method and equipment for industrial waste salt recycling, which can solve the problems of low efficiency of high-salt wastewater and decreased oxidation effect, and achieve the effect of improving the efficiency of advanced oxidation

Active Publication Date: 2020-08-04
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of low efficiency of advanced oxidation process for treating high-salt wastewater, there is no reasonable solution in the prior art. The present invention creatively proposes a A treatment method and equipment for recycling industrial waste salt, adopting a clean and non-secondary pollution-free combined advanced oxidation process, avoiding the problem of reduced oxidation effect when the traditional oxidation process is used for advanced oxidation of high-salt wastewater, and reducing treatment costs for enterprises At the same time, it realizes the recycling of waste salt, which has good social and economic benefits

Method used

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  • A treatment method and equipment for recycling industrial waste salt
  • A treatment method and equipment for recycling industrial waste salt
  • A treatment method and equipment for recycling industrial waste salt

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Effect test

Embodiment 1

[0058] Such as figure 1 As shown, the waste salt of a chemical enterprise is firstly pretreated, and the waste salt is dissolved in water in an enameled reactor with agitation to produce high-salt wastewater. The control salt concentration is 23%wt, and TOC=800mg / L, TN=40 mg / L.

[0059] The method of the present invention is used for treatment. Firstly, the pH of the solution is adjusted to 2 by adding hydrochloric acid into the reaction kettle through the pretreatment unit, and the wastewater after the pH adjustment is passed through a bag filter to remove particulate impurities, and then resin adsorption is performed.

[0060] Using macroporous resin, after secondary adsorption by macroporous resin, TOC is reduced to 100mg / L, and TN is reduced to 31mg / L. After the macroporous resin is adsorbed and saturated, the resin is regenerated by alkali washing, and after repeated adsorption and desorption, the macroporous resin is deeply regenerated with methanol.

[0061] After th...

Embodiment 2

[0077] Waste salt from a chemical company, the control concentration is 23%wt, TOC=600mg / L, TN=40mg / L after testing.

[0078] The method of the present invention is used for treatment. Firstly, the pH of the solution is adjusted to 1.5 by adding hydrochloric acid into the reaction kettle through the pretreatment unit, and the wastewater after the pH adjustment is passed through a bag filter to remove particulate impurities, and then resin adsorption is performed.

[0079] Using macroporous resin, after secondary adsorption by macroporous resin, TOC is reduced to 50mg / L, and TN is reduced to 30mg / L. After the macroporous resin is adsorbed and saturated, the resin is regenerated by alkali washing, and after repeated adsorption and desorption, the macroporous resin is deeply regenerated with methanol.

[0080] After that, advanced oxidation unit treatment is carried out, in which the advanced oxidation unit is carried out in three ways: ozone, hydrogen peroxide and ultraviolet li...

Embodiment 3

[0096] The waste salt of a chemical company has a controlled concentration of 23%wt. After testing, TOC=400mg / L, TN=38mg / L.

[0097] Adopt the method of the present invention to process, at first through the pretreatment unit, adjust the solution pH=1.5 by adding hydrochloric acid in the reaction kettle, after the wastewater after adjusting pH is removed particle impurity through bag filter, carry out resin adsorption, adopt large-scale Porous resin, after secondary adsorption of macroporous resin, TOC is reduced to 80mg / L, and TN is reduced to 28mg / L. After the macroporous resin is adsorbed and saturated, the resin is regenerated by alkali washing, and after repeated adsorption and desorption, the macroporous resin is deeply regenerated with methanol.

[0098] After that, advanced oxidation unit treatment is carried out, in which the advanced oxidation unit is carried out in three ways: ozone, hydrogen peroxide and ultraviolet light at the same time, and the pH of the wastewa...

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Abstract

The invention discloses a treatment method and equipment for recycling industrial waste salt, belonging to the field of environmental protection. It specifically includes the following steps: including the steps of processing through the following units: 1) pretreatment unit, adjusting the pH value of high-salt wastewater and mechanically removing impurities; 2) resin adsorption unit, passing part of the macromolecular organic matter in high-salt wastewater through Removal by resin adsorption; 3) advanced oxidation unit, using the combination of ozone, ultraviolet radiation, and hydrogen peroxide to degrade organic matter simultaneously; 4) advanced treatment unit, using anodic oxidation to treat the effluent of the advanced oxidation unit; the step 4 ) after fine filtration, the effluent can be used as the raw material of ion membrane caustic soda production process for resource utilization directly. The advanced oxidation unit in this process effectively improves the advanced oxidation efficiency of high-salt wastewater, and the treated waste salt is used in the ion membrane caustic soda production process, creating economic benefits for the enterprise and realizing the resource utilization of waste salt.

Description

technical field [0001] The invention belongs to the field of environmental protection, and more specifically relates to a treatment method and equipment for recycling industrial waste salt. Background technique [0002] The amount of chemical waste salt produced through evaporation and crystallization in my country is as high as 2 million tons every year. These waste salts often contain heterocyclic compounds such as benzene series, phenols, oxygen-containing sulfur, nitrogen, and other compounds. For this kind of salt, it is often disposed of in landfill, which has caused serious environmental hazards. [0003] The prior art of Chinese Patent Publication No. CN108726740A discloses a process of using Fenton oxidation + electrocatalytic oxidation + resin adsorption + membrane electrolysis to treat high-concentration sodium chloride-containing wastewater. Porous adsorption resin used at the end has no obvious absorption effect on small molecular substances, and the patent does...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F101/30
CPCC02F1/001C02F1/285C02F1/32C02F1/4672C02F1/66C02F1/722C02F1/78C02F9/00C02F2101/30C02F2303/16
Inventor 王炼陈利芳仇鑫戴建军李爱民周腾腾朱强
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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