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Method for treating chloropyridine wastewater

A chloropyridine and treatment method technology, which is applied in the field of wastewater treatment, can solve the problems of complex treatment methods and low treatment efficiency, and achieve the effects of increasing hydrophobicity, easy precipitation, and improving oxidative decomposition efficiency

Active Publication Date: 2018-10-26
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above two processing methods are complicated and the processing efficiency is not high

Method used

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  • Method for treating chloropyridine wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Processing flow such as figure 1 shown, including the following steps:

[0035] (1) Waste water pH is adjusted to 9, take the quality of waste water as a benchmark, add 0.15% sodium persulfate, under the condition of ultraviolet light, pass into 1.5% chlorine, until the pH of waste water is reduced to 2.3, filter to obtain filtrate 1 ;

[0036](2) Take the quality of filtrate I as a benchmark, add 0.2% ferric chloride in filtrate I, pour it into the high-pressure reactor after fully dissolving, open the heating system, make the temperature stable at 120 ° C, and the system pressure is less than 1.0 MPa, then pump 5% hydrogen peroxide (specification 27.5wt%) oxidant into the autoclave, and react for 120min;

[0037] (3) Adjust the pH of the reaction effluent to 8.6. Based on the quality of the reaction effluent, add 0.001% polyacrylamide PAM (0.1wt%) to increase the floc, and then realize the separation of mud and water by filtering. The quality of the effluent is as f...

Embodiment 2

[0064] (1) Adjust the pH of the wastewater to 9, take the quality of the wastewater as a benchmark, add 0.15% sodium persulfate, and feed 1% chlorine under the condition of ultraviolet light;

[0065] (2) Taking the quality of filtrate I as a benchmark, add 0.2% ferric chloride in filtrate I, pour it into the high-pressure reactor after fully dissolving, and open the heating system; make the temperature stable at 120 ° C, and now the system pressure is less than 1.0 MPa, then pump 5% hydrogen peroxide (specification 27.5wt%) oxidant into the autoclave, and react for 120min;

[0066] (3) Adjust the pH of the reaction effluent to 8.6. Based on the quality of the reaction effluent, add 0.001% polyacrylamide PAM (0.1wt%) to increase the floc, and then realize the separation of mud and water by filtering. The quality of the effluent is as follows :

[0067] pH is 8.6, COD concentration is 3512mg / L, BOD 5 / COD was 0.41, and pyridine compounds were not detected.

[0068] After the...

Embodiment 3

[0070] (1) The pH of the wastewater is adjusted to 9, based on the quality of the wastewater, 0.15% sodium persulfate is added, and 3% chlorine gas is introduced under the condition of ultraviolet light;

[0071] (2) Taking the quality of filtrate I as a benchmark, add 0.2% ferric chloride in filtrate I, pour it into the high-pressure reactor after fully dissolving, and open the heating system; make the temperature stable at 120 ° C, and now the system pressure is less than 1.0 MPa, then pump 5% hydrogen peroxide (specification 27.5wt%) oxidant into the autoclave, and react for 120min;

[0072] (3) Adjust the pH of the reaction effluent to 8.6. Based on the quality of the reaction effluent, add 0.001% polyacrylamide PAM (0.1wt%) to increase the floc, and then realize the separation of mud and water by filtering. The quality of the effluent is as follows :

[0073] pH is 8.6, COD concentration is 2153mg / L, BOD 5 / COD was 0.5, and pyridine compounds were not detected.

[0074...

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Abstract

The invention discloses a method for treating chloropyridine wastewater. The method comprises the following steps that 1, the pH value of the chloropyridine wastewater is adjusted to be 8-10, chlorineis introduced into a polymerization free radical initiator under ultraviolet light till the pH of the wastewater is reduced to 2-4, filtering is carried out, and filtrate I is obtained; 2, a catalystand an oxidizing agent are added into the filtrate I, and a reaction is carried out for 60-180 min at the temperature of 100-150 DEG C and at the pressure of 0.5-2 MPa; 3, the pH of the outflow waterobtained after the oxidization reaction is adjusted to be 8-10, and flocculation and filtration are carried out. The treatment method can be used for carrying out deep treatment on the high-concentration chloropyridine wastewater, and is easy to operate and good in treatment effect.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating chloropyridine wastewater. Background technique [0002] Chloropyridine is a common structure or intermediate of fine chemical products such as medicine and pesticide, and has a wide range of market uses. For example, the global annual market demand for 2-chloropyridine is about 11,000 t / a, and its most important use is to produce daily chemical fungicide copper zinc pyrithione, pesticide forchlorfenuron and diquat and other products. It is used in the synthesis of more than ten kinds of drugs such as antihistamine chlorpheniramine maleate and pheniramine; A variety of anti-inflammatory drugs, antibiotics, sedatives, etc.; 2,6-dichloropyridine can synthesize a variety of new plant growth regulators, and there are four types of them on the market. The global market demand for dichloropyridine is about 6000-7000t / a ; 2,3,5-Trichloropyridine is mainly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/30C02F101/36
CPCC02F1/001C02F1/32C02F1/52C02F1/56C02F1/66C02F1/722C02F1/725C02F1/76C02F9/00C02F2101/30C02F2101/36C02F2301/08
Inventor 黄国龙吴昭堵林峰
Owner ZHEJIANG QICAI ECO TECH CO LTD
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