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Method for treating waste water during production of chlorpyrifos

A technology for the production of wastewater and treatment methods, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of long process chain, high investment cost and operation cost, and complicated process steps and other problems, to achieve the effect of short process chain, low cost and simple process steps

Active Publication Date: 2012-07-25
内蒙古犇星化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The harmful components that need to be treated in the waste water of this method are heavy metal copper, CN-R sulfide, organic phosphorus and nitrogen-containing heterocycles, etc. The process steps are complicated, the process chain is long, and the investment cost and operation cost are high.

Method used

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  • Method for treating waste water during production of chlorpyrifos
  • Method for treating waste water during production of chlorpyrifos
  • Method for treating waste water during production of chlorpyrifos

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 laboratory conditions

[0037] Take 1L of chlorpyrifos condensation wastewater and place it in a beaker. Take 500mL of isooctyl thioglycolate thiolation wastewater, and slowly pour it into chlorpyrifos wastewater, adjust the pH value of chlorpyrifos wastewater to 3.5, after standing for 12 hours, take the supernatant in another beaker, and then add 30% Hydrogen peroxide 3g / L, add ferrous sulfate 0.4g / L, oxidize for 5 hours, then add quicklime (0.3g / L) to it for neutralization and flocculation precipitation for 4 hours, then filter the flocculated waste water (through plate Frame filter press to filter and separate part of the organic matter), and then circulate the filtered wastewater through the activated carbon column for 50 minutes (same hydraulic retention), the influent flow rate is 5m 3 / h.

[0038]The treated waste water was taken and analyzed for COD of 3270mg / L and B / C of 0.42, meeting the requirements of biochemical treatment. The total removal...

Embodiment 2

[0042] Using chlorpyrifos production wastewater as water to be treated, the specific steps for pretreatment are as follows:

[0043] (1) pH value adjustment: use thiolated acidic wastewater to adjust the chlorpyrifos wastewater, and control the pH value of the wastewater at 3.2;

[0044] (2) Fenton oxidation: The adjusted wastewater enters the Fenton oxidation pond, and 30% hydrogen peroxide 3g / L, ferrous sulfate 0.4g / L are added to the Fenton oxidation pond, oxidized for 6 hours, and the influent flow rate is controlled to 5m 3 / h;

[0045] (3) Neutralization, flocculation and filtration: the oxidized wastewater enters the neutralization tank, and quicklime (0.3g / L) is added to the tank for neutralization, and the pH value of the pool water is controlled to be 8.2; the neutralized wastewater is Flocculation precipitation occurs under alkaline conditions, and after 5 hours, part of the organic matter is separated by plate and frame filtration;

[0046] (4) Activated carbon a...

Embodiment 3

[0051] Using chlorpyrifos production wastewater as water to be treated, the specific steps are as follows:

[0052] (1) Chlorpyrifos wastewater is introduced into the sedimentation tank (the length and width of the pool are 5m and 9m, divided into 2 compartments, and the cross-section of the overflow port is 50cm * 30cm), and the control HRT is 30 minutes; the remaining treatment scheme is the same as in Example 2 ;

[0053] (2) The wastewater after adsorption is treated by biochemical (A / O method) (the water temperature is 25°C, the influent flow rate is 5m3 / h, the water quality COD is 86mg / L, and the pH value is 7.6. The total removal rate of COD after activated carbon adsorption is 84.8 %, the total removal rate of COD after A / O treatment is 99.5%.

[0054] The wastewater quality indicators at each stage are as follows:

[0055]

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Abstract

The invention relates to a method for treating waste water during production of chlorpyrifos. The method comprises the following steps of adjusting a pH value; performing Fenton oxidization; and performing neutralization, flocculation, filtration and activated carbon adsorption, wherein the pH value is adjusted by using sulfhydrylation acidic waste water. According to the method, the investment cost and the running cost are reduced; the biodegradability of water is improved; an aim of optimizing a waste water treatment structure is fulfilled; in conclusion, an effect of treating waste by waste is achieved; the method is easy to popularize and high in operability; and the treated waste water can meet the national allowable discharging standard.

Description

technical field [0001] The invention relates to a method for treating pesticide wastewater, in particular to a method for treating wastewater generated during the production of pesticide chlorpyrifos, and belongs to the field of environmental protection. Background technique [0002] Chlorpyrifos is a high-efficiency, broad-spectrum, low-residue, and low-toxicity organophosphorus pesticide widely used in the world. It has good contact killing, stomach poisoning and fumigation effects on pests. It is an excellent variety to replace highly toxic pesticides. The market prospect broad. Chlorpyrifos is formed by the condensation of pyridine phenoxide and ethyl chloride. According to the different solvents used in the synthesis process, it can be divided into organic solvent method, semi-aqueous phase method (or double-solvent method) and all-aqueous phase method (or all-water solvent method). According to the 2011 edition of the national industrial policy, all synthesis methods...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 戴百雄宫廷吴勇熊传宗连建军罗斌卢威
Owner 内蒙古犇星化学有限公司
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