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Treatment method of nitrochlorobenzene wastewater

A technology for nitrochlorobenzene and a treatment method, which is applied in water/sewage treatment, special compound water treatment, biological water/sewage treatment, etc., can solve the problems of poor process continuity, high cost of hazardous waste treatment, and low sodium sulfate content. , to achieve the effect of reducing evaporation and low cost

Active Publication Date: 2021-07-09
JIANGSU RUIHENG NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing process has the following defects: the cost of hazardous waste treatment is high, the content of sodium sulfate concentrated by MVR is low, the loss of electrodialysis membrane components is large, and the process continuity is poor, etc.

Method used

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  • Treatment method of nitrochlorobenzene wastewater
  • Treatment method of nitrochlorobenzene wastewater
  • Treatment method of nitrochlorobenzene wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 2 Shown, the invention provides a kind of treatment method of nitrochlorobenzene waste water, comprises the following steps:

[0029] S1: Continuously put nitrochlorobenzene wastewater into the synergistic oxidation tank, and at the same time pass ozone into the wastewater, and add hydrogen peroxide to obtain synergistic oxidation effluent;

[0030] S2: Introduce the synergistic oxidation effluent into the sludge tank for sedimentation to obtain clear wastewater and a small amount of sludge;

[0031] S3: Introduce the clean wastewater into the ultrafiltration system, filter out solid insolubles, and obtain ultrafiltration effluent;

[0032] S4: introduce the ultrafiltration effluent into the nanofiltration system to obtain nanofiltration concentrated water and nanofiltration fresh water;

[0033] S5: Introduce the concentrated nanofiltration water into the MVR system for evaporation to obtain MVR salt, MVR condensate and MVR mother liquor;

[0034] S6...

Embodiment 2

[0044] Different from Example 1, in Example 2, the ozone consumption is 32kg / h, the hydrogen peroxide consumption is 40kg / h, calculated with COD:TN=6, and the methanol consumption is 42.7kg / h.

[0045] The relevant data of wastewater treatment are shown in Table 2:

[0046] Table 2

[0047]

Embodiment 3

[0049] Different from Example 1, in Example 3, the ozone consumption is 24kg / h, the hydrogen peroxide consumption is 48kg / h, the carbon source adopts glucose, and the consumption is calculated with COD:TN=6, and the glucose consumption is 48.6kg / h.

[0050] The relevant data of wastewater treatment are shown in Table 3:

[0051] table 3

[0052]

[0053]

[0054] To sum up the above data can be obtained, a kind of treatment method of nitrochlorobenzene wastewater of the present invention can open the benzene ring in the wastewater through the synergistic oxidation of ozone and hydrogen peroxide, which is beneficial to biochemical treatment, and the solid insoluble matter can be filtered by the ultrafiltration system. to prevent clogging of the nanofiltration system; through the nanofiltration membrane of the nanofiltration system, the wastewater is divided into nanofiltration concentrated water and nanofiltration fresh water. The filtration rate of sodium sulfate is as h...

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Abstract

The invention provides a treatment method of nitrochlorobenzene wastewater. The method comprises the following steps: after synergistic oxidation of ozone and hydrogen peroxide, filtering out solid insoluble substances through an ultrafiltration system; separating the ultrafiltration effluent into nanofiltration concentrated water and nanofiltration fresh water under the selective permeation action of a nanofiltration membrane of the nanofiltration system; evaporating the nanofiltration concentrated water through an MVR (mechanical vapor recompression) system to obtain high-content sodium sulfate; after the nanofiltration fresh water is diluted, adding a carbon source and a denitrification strain for denitrification, and subjecting the denitrification effluent to biochemical treatment to form the qualified wastewater. Herein, electrodialysis is not used for concentration, loss of an electrodialysis membrane assembly is avoided, sodium nitrate is removed through denitrification, the problem that the hazardous waste treatment cost is high is solved, the problem that the content of sodium sulfate concentrated by MVR is low is solved through nanofiltration, the sodium nitrate aqueous solution is not concentrated, and pipeline blockage is avoided; according to the technical scheme, the treatment cost is low, hazardous waste is not generated, the process continuity is good, the effect is excellent in the actual operation process, and the method is suitable for application and popularization.

Description

technical field [0001] The invention relates to a treatment technology for industrial waste water, in particular to a treatment method for nitrochlorobenzene waste water. Background technique [0002] Nitrochlorobenzene is an intermediate of many fine chemical products such as medicine, pesticide and dye. The production of nitrochlorobenzene is based on chlorobenzene, and the mixed acid of nitric acid and sulfuric acid is used as the nitrating agent for nitration. The crude product obtained by nitration needs to be washed with alkali and water, and then separated and purified by a rectification tower to obtain p-nitrochlorobenzene. Chlorobenzene and o-nitrochlorobenzene. Using the above-mentioned production process, each ton of nitrochlorobenzene products will produce 0.5 tons of waste water. The appearance of the o-nitrate wastewater is brownish red, pH>12, and TOC is about 700mg / L. The organic matter is mainly nitrochlorobenzene and nitrophenol, containing Salt is abo...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34C02F101/36C02F101/38
CPCC02F1/041C02F1/442C02F1/444C02F1/722C02F1/78C02F3/305C02F9/00C02F2001/007C02F2101/34C02F2101/36C02F2101/38C02F2305/06
Inventor 马勇沈杰史雪芳陈英杰王鑫田宇孟宪跃胡凯宋佳滕彦虎
Owner JIANGSU RUIHENG NEW MATERIAL TECH CO LTD
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