Pretreatment method of wastewater generated by trifluralin production

A technology for production wastewater and pretreatment, which is applied in water/sewage treatment, natural water treatment, heating water/sewage treatment, etc. It can solve the problem of high operating cost and achieve high removal efficiency, low catalyst toxicity and high efficiency.

Inactive Publication Date: 2016-10-26
BEIJING HUIYU LEBANG ENVIRONMENT PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of diamond film electrodes and is expensive to run

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, a pretreatment method for trifluralin production wastewater is provided. The treatment object is taken from a domestic trifluralin production plant. The raw water quality is as follows: COD25000mg / L, chroma 4000 times, pH value 8-9 . The pretreatment method is specifically as follows.

[0027] Step S10: Take 60 t of the trifluralin production wastewater, add 0.2 t of sulfuric acid with a concentration of 98%, and adjust the pH value of the trifluralin production wastewater to 2 to carry out the acid precipitation reaction. In the settling device (select two sets of settling devices, switch operation, each set has an effective volume of 60m 3 ) after settling for 24 hours, pump the supernatant into the intermediate tank (effective volume 60m 3 ), to be processed in the next step.

[0028] Step S20: the 60m after acid analysis 3 The waste water is poured into the complex extraction reactor, and the extraction agent 6m 3 , after effectively reacting f...

Embodiment 2

[0033] In this example, a pretreatment method for trifluralin production wastewater is provided. The treatment object is taken from a domestic trifluralin production plant. The raw water quality is as follows: COD25000mg / L, chroma 4000 times, pH value 8-9 . The pretreatment method is specifically as follows.

[0034] Step S10: Take 60 t of the trifluralin production wastewater, add 0.25 t of sulfuric acid with a concentration of 98%, and adjust the pH value of the trifluralin production wastewater to 1-2 to carry out acid precipitation reaction. In the settling device (select two sets of settling devices, switch operation, each set has an effective volume of 60m 3 ) after settling for 24 hours, pump the supernatant into the intermediate tank (effective volume 60m 3 ), to be processed in the next step.

[0035] Step S20: the 60m after acid analysis 3 The waste water is poured into the complex extraction reactor, and 5m of extraction agent is added 3 , after effectively rea...

Embodiment 3

[0040] In this example, a pretreatment method for trifluralin production wastewater is provided. The treatment object is taken from a domestic trifluralin production plant. The raw water quality is as follows: COD25000mg / L, chroma 4000 times, pH value 8-9 . The pretreatment method is specifically as follows.

[0041] Step S10: Take 60 t of the trifluralin production wastewater, add 0.6 t of 30% hydrochloric acid, adjust the pH value of the trifluralin production wastewater to 2, and carry out the acid precipitation reaction. In the settling device (select two sets of settling devices, switch operation, each set has an effective volume of 60m 3 ) after settling for 24 hours, pump the supernatant into the intermediate tank (effective volume 60m 3 ), to be processed in the next step.

[0042] Step S20: the 60m after acid analysis 3 The waste water is poured into the complex extraction reactor, and 5.5m of extractant is added 3 , after effectively reacting for 30 minutes, aft...

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PUM

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Abstract

The invention provides a pretreatment method for trifluralin production wastewater. The pretreatment method is to settle the trifluralin production wastewater after the acid precipitation reaction under the environment of pH 1~2, and take the supernatant; then, add complexing extractant to the obtained supernatant to obtain The complex extraction reaction is carried out, and the organic phase and the water phase are obtained by standing and layering; then, after adding a catalyst to the obtained water phase, the hydrolysis reaction is carried out at 90-100°C. The trifluralin production wastewater pretreatment method provided by the invention is easy to operate, easy to popularize and apply in industrialization, and has obvious environmental benefits, economic benefits and social benefits.

Description

technical field [0001] The invention relates to the field of fine chemical wastewater treatment, in particular to a pretreatment method for trifluralin production wastewater. Background technique [0002] Trifluralin, whose chemical name is 2,6-dinitro-N,N-di-n-propyl-4-trifluoromethylaniline, is a nitramine herbicide that can control grass weeds and many annual It is a broad-leaved weed with the characteristics of high efficiency, low toxicity, low residue and wide herbicidal spectrum. In the production process of trifluralin, high-concentration organic wastewater will be discharged. The wastewater has high chroma, high salt content, high CODcr content, high content of refractory biodegradable substances, and high biological toxicity. Without effective pretreatment, it is difficult to make it meet emission standards. [0003] Trifluralin wastewater is generally pretreated by the iron-carbon + Fenton oxidation combination process. This method has problems such as large amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/02C02F1/26C02F1/5236C02F1/66C02F2001/007C02F2103/343C02F2303/18
Inventor 程迪欧云川赵静殊
Owner BEIJING HUIYU LEBANG ENVIRONMENT PROTECTION TECH CO LTD
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