Treatment method for aniline wastewater

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: 2015-03-25
ZHEJIANG QICAI ECO TECH CO LTD
View PDF7 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 a...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment method for aniline wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0057] Add 1g / L activated carbon powder (based on the volume of the original wastewater) to aniline mixed wastewater (original COD is about 20000mg / L) and stir for 0.5 hours to absorb, and obtain clear liquid I after filtration; the pH of clear liquid I is adjusted with concentrated hydrochloric acid to 3 and heated to 70°C, add 4g / L (based on the volume of the supernatant I) formaldehyde solution (the mass fraction of the formaldehyde solution is 37%), keep stirring and react for 1 hour, adjust the pH to 7 by flocculation filtration, and obtain Solid and supernatant II, the solid product accounted for 0.75% of the mass of the supernatant I was detected as a recoverable compound, and the COD of the supernatant was 2010 mg / L; the pH of the supernatant II was adjusted to 4, and Fenton reacted for 1 hour Afterwards, the pH is adjusted to 8 for flocculation and activated carbon powder is added to stir and decolorize, and the filtrate is filtered to obtain the filtrate. The availab...

Embodiment 3

[0059] Add 1g / L diatomaceous earth (based on the original wastewater volume) to aniline mixed wastewater (original COD is about 20000mg / L) and stir for 0.1 hour to absorb, and obtain clear liquid I after filtration; adjust pH of clear liquid I with concentrated hydrochloric acid After heating to 5 and heating to 80°C, add 4g / L (based on the volume of the supernatant I) formaldehyde solution (the mass fraction of the formaldehyde solution is 37%), keep stirring and react for 1 hour, then adjust the pH to 8 for flocculation filtration, The solid and supernatant II were obtained. The solid product accounted for 0.60% of the mass of the supernatant I. It was detected that it was a recoverable compound. The COD of the supernatant was 4709 mg / L; the pH of the supernatant II was adjusted to 4, and Fenton reacted for 1 hour Afterwards, the pH is adjusted to 8 for flocculation, and the filtrate obtained by filtration is transparent and slightly yellow, and the COD is 1060mg / L, and the a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 is easy to turn brown when exposed to air or sunlight, and has long-term residue and bioaccumulation. It is listed as one of the 129 priority pollutants by the U.S. EPA, and the third-level discharge standard for aniline substances 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, stable in the environment, and not easy to degrade; aniline wastewater is extremely difficult to treat, and if it is discharged randomly, it will cause serious pollution to the water body. [0003] As one of the most important intermediates in the industry, the residual an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/04C02F101/38
Inventor 陈磊龙江刘妍张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap