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Treatment method of benzene-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, biological water/sewage treatment, light water/sewage treatment, etc. The treatment of benzene wastewater has little significance and stays at the stage of academic discussion, and achieves the effects of no secondary pollution in the reaction time, improved oxidation efficiency, and short reaction time

Inactive Publication Date: 2019-04-16
ZHEJIANG DIBANG CHEM
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  • Claims
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Problems solved by technology

Eliminate the nitrobenzene content in wastewater by adding sodium hypochlorite solution, but this technology is mainly aimed at the treatment of low-concentration nitrobenzene wastewater, and has little significance for the treatment of high-concentration nitrobenzene wastewater. In addition, the invention adds the amount of sodium hypochlorite Larger, the concentration of chloride ions in wastewater is higher, which is not conducive to post-treatment
[0006] Regarding the treatment of this type of wastewater, the existing technology mainly stays in the conversion of pollutant factors in wastewater, mainly converting nitrobenzene, nitroaniline and other substances into biodegradable aniline, ammonia nitrogen, organic acids and other substances, The whereabouts of pollutants such as aniline, ammonia nitrogen, and organic acids have not been completely resolved
North University of China has repeatedly proposed to use advanced high-gravity technology combined with nano-zero-valent iron, electrolytic catalytic oxidation, ozone oxidation and other technologies to treat nitrobenzene wastewater, but such research is mainly at the stage of academic discussion, whether it can be used Industrial production still needs to be studied

Method used

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  • Treatment method of benzene-containing wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The water quality characteristics of nitrochlorobenzene wastewater are: pH=8.0, COD=3820mg / L, nitrobenzene=450mg / L, aniline=20mg / L, ammonia nitrogen=30mg / L, BOD5 / COD=0.05.

[0048] (1) The nitrochlorobenzene wastewater to be treated is pumped to the ultrafiltration system, filtered through an ultrafiltration membrane with a pore size of 0.05 μm, and then promoted to the electrolytic cell, and the H concentration of 35% is added. 2 o 2 , H 2 o 2 The dosage is 0.5‰ of the quality of the treatment solution I, the control working voltage is 120V, and the electrolytic catalytic time is 30min to obtain the treatment solution I.

[0049] It was determined that BOD5 / COD=0.28 in the treatment solution I.

[0050] (2) The treatment liquid I is promoted to the UV reaction tower, and a low-pressure mercury lamp is arranged in the UV reaction tower, and it is 35% H that the mass concentration is 35% when the UV wavelength is 220nm. 2 o 2 , H 2 o 2 The dosage is 0.2‰ of the qu...

Embodiment 2

[0059] The water quality characteristics of nitroaniline wastewater are: pH=7.5, COD=2780mg / L, nitrobenzene=182mg / L, aniline=156mg / L, ammonia nitrogen=58mg / L, BOD5 / COD=0.08.

[0060] (1) The nitroaniline wastewater to be treated is pumped to the ultrafiltration system, filtered through an ultrafiltration membrane with a pore size of 0.06 μm, and then promoted to the electrolytic cell, and H2O with a mass concentration of 27.5% is added. 2 o 2 , H 2 o 2 The dosage is 0.4‰ of the quality of the treatment solution I, the control working voltage is 220V, and the electrolytic catalysis time is 25min to obtain the treatment solution I.

[0061] It was determined that BOD5 / COD=0.29 in the treatment liquid I.

[0062] (2) The treatment liquid I is promoted to the UV reaction tower, and a low-pressure mercury lamp is arranged in the UV reaction tower, and the mass concentration of 27.5% H is passed into under the condition that the UV wavelength is 260nm 2 o 2 , H 2 o 2 The dosa...

Embodiment 3

[0071] The water quality characteristics of chlorinated benzene wastewater are: pH=8.5, COD=1680mg / L, nitrobenzene=52mg / L, aniline=18mg / L, ammonia nitrogen=18mg / L, BOD5 / COD=0.06.

[0072] (1) Pump the chlorinated benzene waste water to be treated to the ultrafiltration system, filter it through an ultrafiltration membrane with a pore size of 0.05 μm, and then lift it to the electrolytic cell, and add H with a mass concentration of 27.5% to 35%. 2 o 2 , H 2 o 2 The dosage is 0.3‰ of the quality of the treatment solution I, the control working voltage is 40V, and the electrolytic catalytic time is 20min to obtain the treatment solution I.

[0073] It was determined that BOD5 / COD=0.32 in the treatment solution I.

[0074] (2) The treatment liquid I is promoted to the UV reaction tower, and a low-pressure mercury lamp is arranged in the UV reaction tower, and the mass concentration of 30% H is passed into the UV reaction tower under the condition of 250 nm 2 o 2 , H 2 o 2 T...

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Abstract

The invention belongs to the technical field of wastewater treatment, and specifically discloses a treatment method for benzene-containing wastewater. The method includes the following steps of 1, electrolytic catalysis, 2, UV oxidation, 3, anaerobic acidification, 4, anoxic denitrification and 5, aerobic nitrification. The treatment method has the thorough degradation effect, no elements difficult to treat are introduced in the treatment process, the wastewater can be thoroughly degraded into small molecular substances such as H2O, CO2 and N2, the biodegradability of the benzene-containing wastewater treated by the method can be significantly improved, and pollutant factors such as nitrobenzene, aniline, ammonia nitrogen and COD in the wastewater can be greatly reduced. Compared with theprior art, the cost is low, operation is convenient, pollutant factors can be completely eliminated, and the method has strong industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for benzene-containing wastewater. Background technique [0002] Benzene-containing wastewater specifically includes nitrochlorobenzene, nitroaniline, chlorinated benzene and their mixed wastewater. Nitrochlorobenzene, nitroaniline, and chlorinated benzene are widely used chemical basic raw materials, mainly used in dyes, medicines, and pesticides. And explosives and other industries, the production wastewater of these industries contains a large amount of organic pollutants such as nitrobenzene and aniline. Internationally, there are extremely strict restrictions on its reasonable discharge in industrial wastewater. Its toxicity is generally 20 to 30 times that of other compounds, and it is weakly mutagenic. Long-term exposure is extremely harmful to humans, animals and plants. The U.S. Environmental Protection Agency It has been incl...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/38
CPCC02F9/00C02F1/32C02F1/467C02F1/444C02F1/725C02F1/722C02F3/1263C02F3/28C02F2101/38
Inventor 傅伟松王永陈栋超许颖进戴火锋
Owner ZHEJIANG DIBANG CHEM
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