A method for reducing cod of tricyclazole pesticide wastewater

A pesticide wastewater and tricyclazole technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problem of low Fenton oxidation degradation rate, reduce concentration, improve efficiency, and avoid disposal costs Effect

Active Publication Date: 2019-04-23
江苏南大华兴环保科技股份公司
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Problems solved by technology

[0008] Aiming at the problem that the Fenton oxidation degradation rate is not high due to the high content of hydrazine hydrate in the treatment process of tricyclazole pesticide wastewater in the prior art, the present invention provides a method for reducing the COD of tricyclazole pesticide wastewater, using tricyclazole According to the characteristics of process wastewater in each section of production, the wastewater treatment process should be rationally allocated, and the hydrazine hydrate wastewater generated in the production replacement section and Fe 3+ Treatment measures such as reduction reaction can effectively reduce the content of hydrazine hydrate in comprehensive wastewater, improve the efficiency of Fenton oxidation of wastewater again, take advantage of the valence state of iron ions to achieve the purpose of recycling, reduce the amount of solid waste generated, and reduce the treatment of tricyclazole pesticide wastewater cost

Method used

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  • A method for reducing cod of tricyclazole pesticide wastewater
  • A method for reducing cod of tricyclazole pesticide wastewater
  • A method for reducing cod of tricyclazole pesticide wastewater

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Embodiment 1

[0037] Such as figure 1 As shown, a process wastewater producing tricyclazole in Jiangsu, among which, the water quality of high-concentration wastewater (containing high-salt wastewater condensate) is: CODcr15028mg / L, total nitrogen 850mg / L, water volume 175.5t / d; replacement section produces hydrazine hydrate wastewater Water quality: CODcr42000mg / L, total nitrogen 10280mg / L, hydrazine hydrate 15000mg / L, water volume 7.2t / d; waste gas absorption water and vacuum pump water produced in the chlorination section Water quality: CODcr3080mg / L, total nitrogen 156mg / L, hydrochloric acid mass concentration 10 %, the amount of water is 12t / d. combined with figure 1 , present embodiment proposes a kind of method that reduces tricyclazole wastewater COD, and its steps are as follows:

[0038] (1) When running for the first time, adjust the pH of tricyclazole high-concentration wastewater to 5 with hydrochloric acid, add hydrogen peroxide with a mass fraction of 30% and a ferrous sulf...

Embodiment 2

[0047] Such as figure 1 As shown, a process wastewater producing tricyclazole in Jiangsu, among them, the water quality of high-concentration wastewater (including high-salt wastewater condensate): CODcr12650mg / L, total nitrogen 627mg / L, water volume 175.5t / d; replacement section produces hydrazine hydrate wastewater Water quality: CODcr38500mg / L, total nitrogen 8970mg / L, hydrazine hydrate 13068mg / L, water volume 7.2t / d; water quality of waste gas absorption water and vacuum pump water produced in chlorination section: CODcr2980mg / L, total nitrogen 120mg / L, 12t / d. combined with figure 1 , present embodiment proposes a kind of method that reduces tricyclazole wastewater COD, and its steps are:

[0048] (1) When running for the first time, adjust the pH of tricyclazole high-concentration wastewater to 3 with hydrochloric acid, add hydrogen peroxide with a mass fraction of 50% and a ferrous sulfate solution with a mass concentration of 30%, and aerate and stir for 150 minutes. ...

Embodiment 3

[0056] Such as figure 1 As shown, a process wastewater producing tricyclazole in Jiangsu, among which, the water quality of high-concentration wastewater (containing high-salt wastewater condensate) is: CODcr11280mg / L, total nitrogen 597mg / L, and water volume 175.5t / d; the replacement section produces hydrazine hydrate wastewater Water quality: CODcr35600mg / L, total nitrogen 8125mg / L, hydrazine hydrate 12560mg / L, water volume 7.2t / d; water quality of waste gas absorption water and vacuum pump water produced in chlorination section: CODcr3200mg / L, total nitrogen 160mg / L, 12t / d. combined with figure 1 , present embodiment proposes a kind of method that reduces tricyclazole wastewater COD, and its steps are:

[0057] (1) When running for the first time, adjust the pH of tricyclazole high-concentration wastewater to 2 with hydrochloric acid, add hydrogen peroxide with a mass fraction of 40% and a ferrous sulfate solution with a mass concentration of 25%, and aerate and stir for 1...

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Abstract

Belonging to the technical field of pesticide wastewater treatment, the invention discloses a method for reducing the COD of tricyclazole pesticide wastewater. The technical scheme adopted by the invention includes: conducting Fenton oxidation treatment on tricyclazole high concentration process wastewater, and conducting neutralization precipitation on effluent water; subjecting the iron sludge produced by precipitation to acidification dissolution to form a ferric chloride solution; carrying out reduction reaction on hydrazine hydrate wastewater produced by a tricyclazole production replacement section and the ferric chloride solution, and letting the generated ferrous solution and wastewater reenter the Fenton oxidation reaction section for Fenton oxidation reaction. The method providedby the invention solves the problem of low comprehensive wastewater Fenton oxidation treatment efficiency caused by hydrazine hydrate contained in high concentration comprehensive wastewater, makes full use of the reducibility of hydrazine hydrate to reduce ferric iron so as to obtain ferrous ions, achieves effective cyclic utilization of the catalyst in Fenton oxidation reaction, lowers the concentration of hydrazine hydrate and improves the Fenton oxidation efficiency at the same time, and also saves the solid waste disposal cost of sludge.

Description

technical field [0001] The invention belongs to the technical field of pesticide wastewater treatment, and in particular relates to a method for reducing the COD of tricyclazole pesticide wastewater. Background technique [0002] Since the development of tricyclazole products by Eli Lilly and Company in 1975, tricyclazole has been produced on a large scale in China, and the annual output is increasing day by day. Tricyclazole is mainly used to prevent and treat rice blast caused by Pyrospora oryzae. It belongs to thiazole fungicides. The product is mainly made of o-toluidine and other raw materials through four-step reactions of addition, chlorination, displacement, and ring expansion. . Among them, the addition section: o-toluidine and ammonium thiocyanate undergo condensation reaction under acidic conditions to generate o-toluidine thiourea, resulting in washing wastewater containing o-toluidine, ammonium thiocyanate and intermediates; chlorination section : o-methylphen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/38C02F101/34
CPCC02F1/66C02F1/70C02F1/722C02F1/725C02F3/00C02F9/00C02F2101/34C02F2101/38C02F2101/40C02F2305/026
Inventor 赵选英杨峰戴建军王智宁唐伟杰
Owner 江苏南大华兴环保科技股份公司
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