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Industrial waste salt refining and purifying coupling process and device

An industrial waste salt and process technology, applied in the field of industrial waste salt refining and purification coupling processes and devices, can solve the problems of inability to effectively reduce TN and high treatment costs, and achieve the effects of reducing TN, low treatment costs, and efficient removal

Active Publication Date: 2020-09-08
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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  • Industrial waste salt refining and purifying coupling process and device
  • Industrial waste salt refining and purifying coupling process and device
  • Industrial waste salt refining and purifying coupling process and device

Examples

Experimental program
Comparison scheme
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 an industrial waste salt refining and purifying coupling process and device, and belongs to the field of waste salt treatment of environmental protection. The process comprisesthe step of oxidizing saline water prepared from waste salt, the oxidizing step comprises primary oxidation and secondary oxidation, the primary oxidation comprises the step of adopting ozone oxidation, the secondary oxidation comprises the step of adopting sodium hypochlorite-ozone oxidation which is carried out alternately, and organic nitrogen is converted into nitrogen. Firstly, organic nitrogen is converted into ammonia nitrogen through ozone oxidation; then, the ammonia nitrogen converted from organic nitrogen is further converted into nitrogen in a sodium hypochlorite and ozone alternate oxidation mode, the situation that the organic nitrogen is excessively converted into nitrate nitrogen is effectively avoided through control over all the steps, the organic nitrogen is converted into ammonia nitrogen to the maximum extent and further converted into nitrogen, and the purpose of reducing TN is achieved; ozone oxidation and sodium hypochlorite oxidation are alternately carried out, so that 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 Applications(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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