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A kind of nitrobenzene wastewater treatment process

A technology of nitrobenzene wastewater and treatment process, applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problem of low nitrobenzene removal efficiency, low resin regeneration efficiency, and hindering nitrobenzene removal and other problems, to achieve good treatment effect, low treatment cost, and improved biological adaptability

Active Publication Date: 2021-02-05
SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above process removes nitrobenzene in wastewater to a certain extent, but the resin adsorption method only transfers nitrobenzene from wastewater to other phases, and the analysis solution still needs to be treated, and the regeneration efficiency of the resin is low, and the treatment cost is high; ozone exposure The treatment cost of nitrobenzene wastewater by gas biological filter method is high. When treating high-salt nitrobenzene production wastewater, the removal efficiency of nitrobenzene is low and the decolorization effect is poor.
The above disadvantages have greatly hindered the removal of nitrobenzene in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Nitrobenzene wastewater from a nitrobenzene production enterprise in Dongying, Shandong, the index is: COD Cr 1685mg / L, nitrobenzene 148mg / L, pH 7.6, chromaticity 600 times.

[0043] A kind of nitrobenzene wastewater treatment process, comprises the steps:

[0044] (1) Adjust the pH of nitrobenzene wastewater to 5.0 to obtain waste water to be treated, and then treat the waste water to be treated by electrolytic reaction. The hydraulic retention time of the electrolytic reaction is 10 minutes, and the working voltage is 450V to obtain electrolytically induced wastewater;

[0045] The power supply of the electrolytic reaction adopts a high-voltage pulsed DC power supply, the anode plate is made of cast iron, and the cathode plate is made of brass;

[0046](2) The electrolytic waste water that step (1) is made leads to biological reduction pond, adjusts pH 7.5, adds ferrous sulfate, and the dosage of ferrous sulfate is 10mg / L with ferrous sulfate heptahydrate, carries o...

Embodiment 2

[0058] The nitrobenzene wastewater treatment process as described in Example 1, the difference is that the hydraulic retention time of the electrolysis reaction in step (1) is 5min, and the working voltage is 420V.

[0059] The reduction mixed system was tested, COD Cr 1570mg / L, nitrobenzene 2.9mg / L, pH 7.2, chromaticity 280 times.

[0060] After treatment, the wastewater was tested, COD Cr 88mg / L, nitrobenzene 0.4mg / L, pH 7.2, chromaticity 30 times.

Embodiment 3

[0062] Nitrobenzene waste water treatment process as described in embodiment 1, difference is, in step (2), adjust pH 7.0, add ferrous sulfate, the dosage of ferrous sulfate is 5mg / L, carry out bioreduction treatment, hydraulic retention time is 24h, makes reduction mixed system;

[0063] The sludge concentration of the biological reduction treatment is 6000mg / L; the biological reduction pool sludge is inoculated with bacterial strain BioRemove 5150 and activated sludge of municipal sewage treatment plant at the initial stage of cultivation;

[0064] The reduction mixed system was tested, COD Cr 1583mg / L, nitrobenzene 2.7mg / L, pH 7.2, chromaticity 280 times.

[0065] After treatment, the wastewater was tested, COD Cr 85mg / L, nitrobenzene 0.35mg / L, pH 7.2, chromaticity 30 times.

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Abstract

The invention relates to a nitrobenzene wastewater treatment process. The process comprises steps as follows: (1) to-be-treated wastewater is subjected to an electrolytic reaction, and electrolytic induced wastewater is produced; (2) the electrolytic induced wastewater is subjected to biological reduction treatment, and a reduced mixed system is produced; (3) the reduced mixed system is subjected to mud-water separation, and reduced wastewater is produced; (4) the wastewater is introduced into an aerobic biochemical pool for aerobic treatment, and an aerobic mixed system is produced; (5) the aerobic mixed system is introduced into a secondary sedimentation tank for mud-water separation, and aerobic wastewater is prepared; (6) the aerobic wastewater is subjected to catalytic ozonation, and treated wastewater is prepared. Nitro-active sites on nitrobenzene molecules are excited under the electrolysis induction action of high-voltage pulse, then the nitrobenzene molecules are efficiently reduced by the subsequent enhanced bioreduction action to be converted into biodegradable aniline, the biological adaptability of wastewater is also improved significantly, and accordingly, good conditions are created for subsequent biochemical treatment.

Description

technical field [0001] The invention relates to a process for treating nitrobenzene wastewater, which belongs to the technical field of industrial wastewater treatment. Background technique [0002] Nitrobenzene is an important chemical raw material and fine chemical intermediate. It is a highly toxic chemical and has great harm to the ecological environment. Therefore, my country's wastewater discharge standards have strict standards for p-nitrobenzene substances. [0003] Nitrobenzene wastewater has the characteristics of strong biological toxicity, high pollutant concentration, high salt content, and high chroma, and is a typical refractory industrial wastewater. [0004] Nitrobenzene molecules have strong biological toxicity and are difficult to be degraded by microorganisms. The treatment of nitrobenzene wastewater mainly includes physical methods, chemical methods, biological methods and a combination of the above three methods. [0005] Chinese patent document CN103...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/38
CPCC02F1/32C02F1/461C02F1/725C02F1/78C02F3/1215C02F3/1221C02F3/34C02F9/00C02F2001/007C02F2003/003C02F2101/38C02F2201/46135C02F2201/4615C02F2209/06C02F2209/08C02F2209/44C02F2301/046C02F2301/08C02F2305/06
Inventor 洪卫王晓明刘勃季华东庄会栋邹晓凤马芳谭心赵伟李秋成
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD