Treatment method and treatment system for nitrochlorobenzene production waste water

A technology for producing wastewater and nitrochlorobenzene, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. , high operating costs, to achieve the effect of easy operation, no secondary pollution, low operating costs

Inactive Publication Date: 2014-07-30
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above patents and studies have shown that for refractory nitrochlorobenzene wastewater with complex components and high concentrations, the use of a single treatment process such as biodegradation, chemical (catalytic) oxidation, electrochemical oxidation, and activated carbon adsorption is due to toxicity inhibition and operating costs. High, secondary pollution and incomplete mineralization of organic matter, etc., it is difficult to operate stably and efficiently in practical applications

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  • Treatment method and treatment system for nitrochlorobenzene production waste water
  • Treatment method and treatment system for nitrochlorobenzene production waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take 200ml of nitrochlorobenzene production wastewater, then add sodium hydroxide and hydrochloric acid to adjust the pH to 1~3, and react for 5~10min. In the case of a stirring speed of 55r / min, sodium hypochlorite was added to the acidic wastewater and reacted for 10-30 minutes. After the reaction is complete, add sodium hydroxide to adjust the pH to neutral, then add polyaluminum chloride solution, react for 20-30 minutes at a stirring speed of 80 r / min, and then let stand for 30-50 minutes. The supernatant is effluent, and the chromaticity, COD and nitrobenzene compounds of the supernatant are detected by HJ 592-2010 "Determination of Nitrobenzene Compounds by Gas Chromatography", which meets the requirements of GB8979-1996 "Comprehensive Wastewater Discharge Standard". primary standard.

Embodiment 2

[0029] Adopt the waste water treatment system of the present invention, 50m 3 / d of nitrochlorobenzene wastewater treatment for 8 hours, continuous operation, the hourly treatment capacity is 6.25m 3 . See above for the treatment process, and the process parameters are as follows: In the adjustment tank, use a sodium hydroxide solution with a mass concentration of 1mol / L and a hydrochloric acid solution with a mass concentration of 1mol / L to adjust the pH to 2, and the wastewater stays for 10 minutes; the stirring speed of the mixer in the oxidation tank is maintained at 55r / min, the mass concentration of oxidant sodium hypochlorite solution is 8%, and the dosage of sodium hypochlorite solution is 30L / m 3 , the wastewater stays for 20 minutes; in the neutralization tank, the speed of the mixer is maintained at 60r / min, and the pH of the oxidized wastewater is adjusted to be neutral by using a sodium hydroxide solution with a mass concentration of 1mol / L, and the wastewater st...

Embodiment 3

[0031] Adopt the waste water treatment system of the present invention, 50m3 / d of nitrochlorobenzene wastewater treatment for 8 hours, continuous operation, the hourly treatment capacity is 6.25m 3 . See above for the treatment process, and the specific process parameters are: in the adjustment tank, use a sodium hydroxide solution with a mass concentration of 1mol / L and a hydrochloric acid solution with a mass concentration of 1mol / L to adjust the pH to 1, and the wastewater stays for 5 minutes; the stirring speed of the mixer in the oxidation tank is maintained at 50r / min, the mass concentration of oxidant calcium hypochlorite solution is 10%, and the dosage of calcium hypochlorite solution is 20L / m 3 , the wastewater stays for 10 minutes; in the neutralization tank, the speed of the mixer is maintained at 65r / min, and the pH of the oxidized wastewater is adjusted to be neutral by using a sodium hydroxide solution with a mass concentration of 1mol / L, and the wastewater stay...

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Abstract

A treatment method and a treatment system for nitrochlorobenzene production waste water. The method comprises the following steps: pumping nitrochlorobenzene production waste water into an adjustment pool, adjusting the pH value to allow the waste water to be acidic, then allowing the waste water to enter an oxidation pool, adding oxidizing agents of sodium hypochlorite, calcium hypochlorite or hypochloric acid for chemical oxidation treatment, discharging the effluent from the oxidation pool into a neutralization pool, adjusting the pH value to allow the effluent to be neutral, discharging the effluent from the neutralization pool into a coagulation pool, adding coagulants of one or more than one of polyaluminium chloride, polyferric chloride, and polyacrylamide for a coagulation reaction, discharging the effluent from the coagulation pool into a sedimentation pool, allowing a supernatant obtained by sedimentation and separation in the sedimentation pool to overflow into a clean water pool, discharging the clean water that reaches the standard, concentrating and filtering sedimentated sludge at the bottom of the sedimentation pool for safety treatment, and discharging waste liquid generated during the concentration and filtration process into the adjustment pool for re-treatment. According to the invention, the removal rate of nitrochlorobenzene and other nitrobenzene compounds in effluent of the nitrochlorobenzene production waste water treated by the method of the invention is up to 99%, and the method of the invention has the advantages of high treatment efficiency, low operation cost, no secondary pollution, and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method and a treatment system for nitrochlorobenzene production wastewater. Background technique [0002] Nitrochlorobenzene (Nitrochlorobenzenes) is a class of chlorine-containing nitro-aromatic hydrocarbon compounds, widely used as intermediates in the production of medicines, dyes and pesticides, and my country is one of the countries with the largest output of o- and p-nitrochlorobenzenes in the world . In 2002, the world's output of nitrochlorobenzene compounds was 430,000 t / a, and China's output was 330,000 t / a, accounting for 76.7% of the world's total output. In 2003, my country's output of nitrochlorobenzene reached 370,000 tons, an annual increase of 12%. [0003] Nitrochlorobenzene will enter the environment through many ways and become pollutants. Some studies have shown that o-nitrochlorobenzene is a genotoxin and has "triple-induced" effects. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 王锐陈华军李冬张少文
Owner LUOYANG INST OF SCI & TECH
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