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A kind of treatment process of sodium m-nitrobenzenesulfonate production wastewater

A technology for sodium nitrobenzene sulfonate and waste water production, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problem of huge waste water treatment equipment, expensive activated carbon, nitro Compound explosion and other problems, to achieve high practicality and application value, energy saving, complete reaction effect

Active Publication Date: 2016-09-07
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can remove nitrobenzene more effectively than a single aerobic microbial treatment method, but the process is complicated, the wastewater treatment device is huge, and the treatment effect may not meet the standard when the temperature is low
[0009] The Chinese patent document with the publication number CN101700940A discloses a method for nitrobenzene wastewater treatment and resource recovery, that is, activated carbon fibers are used to absorb nitrobenzene, and then methanol or ethanol is used to desorb and regenerate the activated carbon fibers, and nitrobenzene can be recovered. Recycling, but the operation of the invention is complicated, and the nitro compounds are prone to explosion hazards during thermal regeneration of activated carbon, and the price of activated carbon is expensive, and the loss during use is relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The wastewater produced by a chemical factory producing sodium m-nitrobenzenesulfonate, COD=98720mg / L, pH=8.5, the content of sodium m-nitrobenzenesulfonate is 2453mg / L, the content of nitrobenzene is 96mg / L, and the content of sodium sulfate was 28.7%.

[0034]Add 49% sulfuric acid aqueous solution to adjust the pH of the waste water to 2, filter to remove suspended solids in the waste water, and obtain filtrate I. The filtrate I is passed into iron-carbon spheres with a particle size range of 15 to 35 mm (the weight ratio of iron-carbon spheres with different particle sizes is 15 to 20 mm: 21 to 25 mm: 26 to 30 mm: 31 to 35 mm = 0.5: 0.5 :1:0.5) in the iron-carbon pool, and add an aeration device to the iron-carbon pool for aeration, and add copper powder in the iron-carbon pool as a catalyst, and the residence time of the filtrate in the iron-carbon pool is 8h. After the reaction is over, pump it into a filter press system for filtration to obtain filtrate II. The ...

Embodiment 2

[0044] The waste water produced by a chemical factory producing sodium m-nitrobenzenesulfonate, COD=86970mg / L, pH=9.6, the content of m-nitrobenzenesulfonic acid is 2045mg / L, the content of nitrobenzene is 87mg / L, and the content of sodium sulfate is 26.8%.

[0045] Add 49% sulfuric acid aqueous solution to adjust the pH of the waste water to 2, filter to remove suspended solids in the waste water, and obtain a filtrate. The filtrate is passed into the iron-carbon pool equipped with iron-carbon balls with a particle size range of 15mm to 35mm, and an aeration device is added to the iron-carbon pool for aeration, and copper powder is added to the iron-carbon pool as a catalyst, and the waste water The residence time in the iron-carbon pool is 6h. After the reaction, the waste water is sent to the filter press system for filtration. Pass 15% sodium hydroxide aqueous solution into the filtrate to adjust the pH of the wastewater to 9, then stir rapidly for 1 minute, then gradual...

Embodiment 3

[0047] The waste water produced by a chemical factory producing sodium m-nitrobenzenesulfonate COD=67860mg / L, pH=7.4, the content of m-nitrobenzenesulfonic acid is 1575mg / L, the content of nitrobenzene is 68mg / L, and the content of sodium sulfate is 24.6 %.

[0048] Add 49% sulfuric acid aqueous solution to adjust the pH of the waste water to 4, filter to remove suspended solids in the waste water to obtain a filtrate. The filtrate is passed into the iron-carbon pool equipped with iron-carbon balls with a particle size range of 15mm to 35mm, and an aeration device is added to the iron-carbon pool for aeration, and lead powder is added to the iron-carbon pool as a catalyst, and the waste water The residence time in the iron-carbon pool is 5h. After the reaction is over, send the waste water into the filter press system for filtration, and pass 15% sodium hydroxide aqueous solution into the waste water to adjust the pH of the waste water to 8, then stir it rapidly for 1.5 minut...

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Abstract

The invention discloses a treatment process of sodium metanitrobenzene sulfonate production wastewater. The process comprises the following steps: adjusting the pH value of the sodium metanitrobenzene sulfonate production wastewater to 1-4 and filtering to obtain the filtrate I; putting the filtrate I into a reaction tank containing an iron carbon ball and a catalyst, aerating and stirring to react for 4-8 hours, filtering and discharging the effluent; adjusting the pH value of the effluent to 8-11, rapidly stirring for 1-3 min, slowly stirring for 20-60 min, filtering and discharging the effluent; adding a decoloration flocculating agent in the effluent during the flocculation process, rapidly stirring for 30-60 s and slowly stirring for 3 min; adding polymeric aluminum chloride, rapidly stirring for 30-60 s and slowly stirring for 3 min; and adding polyacrylamide, rapidly stirring for 30-60 s, slowly stirring for 3 min, filtering and discharging the effluent; adding an active carbon into the effluent, adsorbing the effluent, performing reduced pressure distillation, recovering the inorganic salt, returning the concentrated solution to reprocess, and reusing the condensed fluid.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a process for treating wastewater produced by sodium m-nitrobenzenesulfonate. Background technique [0002] Sodium m-nitrobenzene sulfonate, also known as 3-nitrobenzene sodium sulfonate, is an important dye intermediate, which can be used as a vat dye, a sulfur dye resist, a dye color protection agent and a dye during dye synthesis. Oxidant can also be used as a catalyst in organic synthesis and dye industry, and can also be used as an antirust agent for ships and a nickel stripper for electroplating. Its production process is: using gas SO 3 Sulfonate nitrobenzene, and salt out the sulfonated product m-nitrobenzenesulfonic acid through salting out. After neutralization and recovery of sodium sulfate hydrate, the mother liquor is recycled as a salting out agent. The COD of wastewater discharged during its production is as high as 50,000-100,000mg / L, con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/36
Inventor 贾军芳王平施孟华陈磊李想钟芳华周小龙
Owner ZHEJIANG QICAI ECO TECH CO LTD