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A Coupling Process and Device for Refining and Purifying Industrial Waste Salt

A technology of industrial waste salt and process, which is applied in the field of industrial waste salt refining and purification coupling process and equipment, can solve the problems of ineffective reduction of TN and high treatment cost, and achieve the effect of reducing TN, low treatment cost and efficient removal

Active Publication Date: 2021-03-02
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the existing technology has high processing cost or can only reduce waste salt TOC but cannot effectively reduce TN, the present invention provides a coupling process and device for refining and purifying industrial waste salt. In the oxidation step adopted in the coupling process, ozone oxidation is firstly used , and then use sodium hypochlorite and ozone to alternately oxidize organic nitrogen into ammonia nitrogen and further into nitrogen to achieve the purpose of reducing TN;

Method used

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  • A Coupling Process and Device for Refining and Purifying Industrial Waste Salt
  • A Coupling Process and Device for Refining and Purifying Industrial Waste Salt
  • A Coupling Process and Device for Refining and Purifying Industrial Waste Salt

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Atrazine waste salt was treated by nanofiltration separation-resin adsorption-multistage oxidation combined process. The TOC content in the waste salt is 600.7mg / kg, the TN content is 430.2mg / kg, and the impurities are mainly organic substances such as atrazine, propazine, simazine, and cyanuric chloride.

[0057] Step 1. Use a forklift to transport the waste salt into the salt tank to prepare nearly saturated brine, pre-treat to remove insoluble matter, and then pump it into the water inlet tank of the nanofiltration separation device; specifically: dissolve sodium chloride salt in deionized water Make nearly saturated brine, use sand filtration and ultrafiltration (hollow fiber PVDF ultrafiltration membrane, molecular weight cut-off 300000-500000) to remove large particles of insoluble matter in brine, at this time the brine TOC is 289.5mg / L, TN is 152.4 mg / L, and then enter the nanofiltration separation step;

[0058] Step 2. Adjust the pH of the brine, pump the bri...

Embodiment 2

[0079] The combined process of nanofiltration separation-resin adsorption-multistage oxidation was used to treat the waste salt of propiconazole. The TOC content in the waste salt is 530mg / kg, the TN content is 196.1mg / kg, and the impurities are mainly organic substances such as propiconazole, N-methylpyrrolidone, and dimethyl sulfide.

[0080] Step 1. Use a forklift to transport the waste salt into the salt tank to prepare nearly saturated brine, pre-treat to remove insoluble matter, and then pump it into the water inlet tank of the nanofiltration separation device; specifically: dissolve sodium chloride salt in deionized water Make nearly saturated brine, use sand filtration and ultrafiltration (hollow fiber PVDF ultrafiltration membrane, molecular weight cut-off is 300000-500000) to remove large particles of insoluble matter in brine, at this time the brine TOC is 159mg / L, TN is 58.9mg / L, then enter the nanofiltration separation step;

[0081] Step 2. Adjust the pH of the...

Embodiment 3

[0102] The combined process of nanofiltration separation-resin adsorption-multistage oxidation was used to treat the waste salt of tebuconazole. The TOC content in the waste salt is 1010.8mg / kg, the TN content is 413.1mg / kg, and the impurities are mainly other organic substances.

[0103] Step 1. Use a forklift to transport the waste salt into the salt tank to prepare nearly saturated brine, pre-treat to remove insoluble matter, and then pump it into the water inlet tank of the nanofiltration separation device; specifically: dissolve sodium chloride salt in deionized water Make nearly saturated brine, use sand filtration and ultrafiltration (hollow fiber PVDF ultrafiltration membrane, molecular weight cut-off 300000-500000) to remove large particles of insoluble matter in brine, at this time the brine TOC is 337.3mg / L, TN is 113.5 mg / L, and then enter the nanofiltration separation step;

[0104] Step 2. Adjust the pH of the brine, pump the brine into the nanofiltration separa...

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Abstract

The invention discloses a coupling process and device for refining and purifying industrial waste salt, which belongs to the field of waste salt treatment for environmental protection. The process includes the step of oxidizing brine prepared from waste salt, the oxidation step includes primary oxidation and secondary oxidation, the primary oxidation includes the step of using ozone oxidation, and the secondary oxidation includes using alternately carried out sodium hypochlorite- The ozone oxidation step converts organic nitrogen into nitrogen gas. By first using ozone oxidation to convert organic nitrogen into ammonia nitrogen, and then using sodium hypochlorite and ozone to alternately oxidize the ammonia nitrogen converted from organic nitrogen into nitrogen gas, through the control of each step, the conversion of excessive organic nitrogen into nitrate nitrogen is effectively avoided , but to maximize the conversion to ammonia nitrogen and further conversion to nitrogen to achieve the purpose of reducing TN; by alternating ozone oxidation and sodium hypochlorite oxidation, the TN removal rate reaches the maximum.

Description

technical field [0001] The invention belongs to the field of waste salt treatment for environmental protection, and more specifically relates to a coupling process and device for refining and purifying industrial waste salt. Background technique [0002] The chemical industry is one of the important pillar industries of the national economy. While promoting economic development, it also brings a variety of environmental problems. For example, in the pesticide industry, each ton of hydrazine hydrate, furanol, and glyphosate produced 4-5 tons, 0.67 tons, 1.1-1.4 tons of sodium chloride waste salt, the above three products alone amount to more than 300,000 tons of waste salt in the country every year. This kind of waste salt has complex components and contains a variety of toxic and harmful impurities, so it cannot be directly used as industrial raw material salt, and it is difficult to find a suitable method to effectively treat it. At present, the problem of waste salt has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/16C02F101/30C02F101/38
CPCC02F1/001C02F1/04C02F1/28C02F1/442C02F1/444C02F1/66C02F1/76C02F1/78C02F9/00C02F2101/16C02F2101/30C02F2101/38
Inventor 陈利芳王炼高静静郭鹏李正斌戴建军李爱民
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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