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Treatment method for carbendazim production wastewater

A technology for producing wastewater and treatment methods, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Simple operation and high pollutant removal rate

Active Publication Date: 2015-12-16
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

COD and NH of the method 3 - The removal rate of N is very low, the treated effluent needs to undergo biochemical treatment, and the treatment cycle is relatively long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Diazotization: Add concentrated hydrochloric acid to the carbendazim production wastewater to adjust the pH to 1, maintain the system temperature at 5-8°C, add 1.2 times the amino molar amount of sodium nitrite in the carbendazim production wastewater, and maintain Stir the reaction at this temperature for 1 h, and filter to obtain a diazotization treatment solution.

[0066] (2) Micro-electrolysis: Put the diazo treatment solution obtained in step (1) into the micro-electrolysis reaction tank, keep the volume of wastewater in the reaction tank to be 9 times the volume of the iron-carbon reagent, and after 1 hour of normal temperature aeration reaction, the wastewater enters the flocculation Kettle, pour into the kettle and then add 0.00003% PAM (used after PAM beating with water) sodium hydroxide solution with a mass fraction of 0.00003%, keep the pH of the wastewater between 9-10, stir and flocculate for 0.5h and then filter to obtain a more transparent orange yell...

Embodiment 2

[0071] (1) Diazotization: Add concentrated hydrochloric acid to the carbendazim production wastewater to adjust the pH to 1, maintain the system temperature at 1-6°C, add 1.1 times the amino molar amount of sodium nitrite in the carbendazim production wastewater, and maintain Stir the reaction at this temperature for 1 h to obtain a diazotization treatment solution.

[0072] (2) Iron-carbon micro-electrolysis: the diazotization treatment solution is added with a mass fraction of 0.3% (based on the weight of carbendazim production wastewater) and carbon powder with a mass fraction of 3% (based on the weight of carbendazim production wastewater) The iron powder was subjected to iron-carbon micro-electrolysis reaction for 4 hours, during which concentrated hydrochloric acid was added to the reaction system to maintain the pH of the reaction system below 4. After the iron-carbon micro-electrolysis reaction, use CaO to adjust the pH to 8-9, stir slowly for 30 minutes, and then add ...

Embodiment 3

[0077] (1) Diazotization: Add concentrated hydrochloric acid to the carbendazim production wastewater to adjust the pH to 2, maintain the system temperature at 5-10°C, add 1.2 times the amino molar amount of sodium nitrite in the carbendazim production wastewater, and maintain Stir the reaction at this temperature for 1 h to obtain a diazotization treatment solution.

[0078] (2) Wet oxidation: transfer the diazotization treatment liquid to the oxidation reactor, and pass N 2 Replaced 3 times, then fed air, raised the temperature to 180°C, adjusted the pressure of the oxidation reactor to 6Mpa, the stirring speed to 400r / min, and continued the reaction for 4h to obtain the oxidation treatment solution.

[0079] (3) Post-treatment: heat exchange the oxidation treatment liquid to cool down to 60-80°C, add CaO to adjust the pH to 7-8, blow off with air for 2 hours, and obtain the blow-off liquid; add a mass fraction of 0.3 to the blow-off liquid % (based on the weight of strippi...

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Abstract

The invention discloses a treatment method for carbendazim production wastewater. The method includes the following steps of firstly, conducting wet type oxidation, wherein a wet type oxidation reaction is conducted on carbendazim production wastewater to obtain oxidation treatment liquid, the temperature of the wet type oxidation reaction ranges from 130 DEG C to 260 DEG C, and the pressure of the wet type oxidation reaction ranges from 0.5 MPa to 6 MPa; secondly, conducting aftertreatment, wherein the oxidation treatment liquid is blown off under the alkaline condition to obtain blown-off liquid, and the blown-off liquid is adsorbed by an adsorbing agent to obtain processed discharged water. The method further includes the step of conducting preprocessing of a diazo-reaction and / or a ferric-carbon micro-electrolysis reaction on carbendazim production wastewater. The method is easy to operate, and the removal rate of nitrobenzene compounds and COD in organic wastewater is high; materials and energy can be recycled in the organic wastewater treatment process, and the treatment cost is low.

Description

technical field [0001] The invention belongs to the technical field of pesticide wastewater treatment, and in particular relates to a treatment method for carbendazim production wastewater. Background technique [0002] Carbendazim, methyl-1H-2-benzimidazole carbamate, also known as cotton wilting, benzimidazole No. 44. Carbendazim is a broad-spectrum fungicide, which can be used for crop foliar spray, seed treatment and soil treatment, etc. It has control effects on crop diseases caused by fungi (such as Deuteromycetes, Polyascomycetes). [0003] The industrial production method of carbendazim mainly uses methanol, phosgene, and lime nitrogen (calcium cyanamide) as raw materials to synthesize methyl cyanamide formate, and then condenses with o-phenylenediamine to generate carbendazim. This method is called calcium cyanamide method or methyl chloroformate synthesis method. During the production of carbendazim, a large amount of organic wastewater will be produced, mainly c...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/06C02F101/12C02F101/38C02F103/36
Inventor 毛兵龙江梁伟施孟华
Owner ZHEJIANG QICAI ECO TECH CO LTD
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