A kind of treatment method of aniline waste water

A treatment method and technology for wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of increasing the salt content of wastewater, high one-time investment, and highly toxic intermediate products and other problems, to achieve the effect of improving the ability of oxidative degradation, simple process flow, easy and cheap medicine

Active Publication Date: 2016-08-24
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] 4. Aniline wastewater has strong acidity or alkalinity, which not only increases the cost of wastewater treatment, but also increases the salt content in wastewater;
There are many oxidation methods, some advanced oxidation technologies such as ozone oxidation, wet oxidation, photocatalytic oxidation and supercritical water oxidation, which have a better treatment effect on aniline wastewater, but the pressure, residence time, and ozone concentration are not Good control, great impact on aniline removal rate, high cost, serious secondary pollution problem; ultrasonic degradation method and ozonation method consume huge energy and cause serious noise; wet oxidation method has high equipment cost and high one-time investment of the system, and prone to produce highly toxic intermediates
[0015] 3) Biological method: In the process of modern biotechnology treatment, aerobic biological oxidation, facultative biodegradation and anaerobic digestion and degradation are widely used, but because aniline is difficult to degrade, there are many limitations in the treatment of aniline wastewater by biotechnology
However, its parameters have not been introduced in detail, and the method consumes a lot of energy, and it is difficult to treat high-concentration aniline wastewater.

Method used

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  • A kind of treatment method of aniline waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Add 1g / L activated carbon powder (based on the original wastewater volume) to aniline wastewater (original COD is 24800mg / L, aniline concentration is 8211mg / L), stirring and adsorbing for 0.5 hours, and after filtration, clear liquid I is obtained; clear liquid I is concentrated After adjusting the pH to 3 with hydrochloric acid and heating to 70°C, add 6g / L (the volume of the supernatant I as the benchmark) formaldehyde solution (the mass fraction of the formaldehyde solution is 37%), and adjust the pH to 7 after 1 hour of insulation and stirring reaction After flocculation and filtration, MDA and supernatant II were obtained. The mass of MDA is about 1% of the mass of clear liquid I, the purity of MDA is 96.8%, and the COD of clear liquid II is 1300 mg / L; the pH of clear liquid II is adjusted to 4, and the pH of clear liquid II is adjusted to 8 after 1 hour of Fenton reaction. Carry out flocculation, filter the COD of the filtrate to be 600mg / L, add 0.3g / L of availabl...

Embodiment 2

[0057] Add 1g / L activated carbon powder (based on the original wastewater volume) to the aniline mixed wastewater (original COD is about 20000mg / L), stir and adsorb for 0.5 hours, and filter to obtain clear liquid I; 3 and heated to 70° C., add 4g / L (the volume of the supernatant I as the benchmark) formaldehyde solution (the mass fraction of the formaldehyde solution is 37%), and adjust the pH to 7 for flocculation and filtration after thermal insulation and stirring reaction for 1 hour to obtain Solid and supernatant II, the obtained solid product accounts for 0.75% of the mass of supernatant I. The detection shows that it is a recoverable compound, and the COD of the supernatant is 2010 mg / L; the pH of supernatant II is adjusted to 4, and the Fenton reaction is performed for 1 hour. Then, the pH was adjusted to 8 for flocculation and activated carbon powder was added to stir and decolorize, and the filtrate was filtered to obtain a transparent and clear filtrate with a COD o...

Embodiment 3

[0059] Add 1g / L diatomaceous earth (based on the original wastewater volume) to aniline mixed wastewater (original COD is about 20000mg / L), stir and adsorb for 0.1 hour, and filter to obtain clear liquid I; clear liquid I is adjusted to pH with concentrated hydrochloric acid After reaching 5 and heating to 80°C, add 4g / L (the volume of the supernatant I as the benchmark) formaldehyde solution (the mass fraction of the formaldehyde solution is 37%), and adjust the pH to 8 for flocculation and filtration after thermal insulation and stirring reaction for 1 hour. The solid and supernatant II were obtained. The solid product accounted for 0.60% of the mass of the supernatant I. The detection showed that it was a recoverable compound, and the COD of the supernatant was 4709 mg / L; the pH of the supernatant II was adjusted to 4, and the Fenton reaction was performed for 1 hour. Then adjust the pH to 8 for flocculation, and filter to obtain a filtrate that is transparent and slightly y...

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Abstract

The invention discloses a treatment method for aniline wastewater. The treatment method comprises the following steps: firstly, adjusting the aniline wastewater to acid; heating to 40-100 DEG C and mixing with a formaldehyde solution, after condensation polymerization, adjusting the pH to 6-9, and filtering to obtain a supernate I; then, adjusting the pH value of the supernate I to 2-6, after Fenton reaction, adjusting the pH value to 7-10 for flocculation, and filtering to obtain a supernate II; and adding a NaClO solution into the supernate II, reacting at 30-50 DEG C for 0.1-2 hours and filtering. The invention provides the treatment method for the aniline wastewater. By combined use of a condensation polymerization-Fenton-NaClO oxidization technology, the COD and aniline content of the aniline wastewater are obviously reduced, the treatment effect is remarkable, no solid wastes are generated, and secondary pollution is not caused.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater, in particular to a method for treating aniline wastewater. Background technique [0002] Aniline, commonly known as Anilin oil, is a colorless oily liquid with an aromatic odor. It is the most representative substance of aromatic amines. It easily turns brown when exposed to air or sunlight, and has long-term residual and bioaccumulation. It is listed as one of the 129 pollutants under priority control by the US EPA, and the third-level discharge standard for anilines in industrial wastewater stipulated by the state is 5mg / L. As one of the most important intermediates in the dye industry, aniline is highly toxic, and has stable properties in the environment and is not easy to degrade; aniline wastewater is extremely difficult to treat, and will cause serious pollution to the water body if it is randomly discharged. [0003] As one of the most important intermediates in the industry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/38
Inventor 陈磊龙江刘妍张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
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