Continuous treatment method for dye industry acid wastewater

A technology for acidic wastewater and treatment methods, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as difficult treatment and secondary pollution, achieve significant energy saving and emission reduction, avoid waste residue generation, The effect of reducing production costs

Active Publication Date: 2016-03-23
ZHEJIANG LONGSHENG GROUP +1
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The dye industry, including the production process of various dyes and intermediates, will produce a large amount of acid wastewater. The traditional acid wastewater treatment method is to use lime neutralization method, but a large amount of calcium sulfate and attached organic matter will be produced during the treatment process, causing secondary pollution. secondary pollution
[0003] In recent years, there have been many reports on the treatment of acidic wastewater, among which more introductions have been made to reclaim ammonium sulfate (sodium sulfate) or ammon

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
  • Continuous treatment method for dye industry acid wastewater
  • Continuous treatment method for dye industry acid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Reference figure 2 , Acidic wastewater comes from wastewater containing sulfuric acid in dye production (sulfuric acid content is 5.68%, COD is 11380mg / L). Both the first desorption tower and the second desorption tower are built with a primary volume of 12m 3 The granular activated carbon adsorption column (granular activated carbon particle size 1.2~1.4mm), the neutralization device is a three-stage series neutralization pot, the physical filtration uses a cloth bag filter, and the temperature of the primary furnace (3) of the regeneration furnace is controlled at 880℃, and the secondary furnace (7) The temperature is 620℃, and the flow meter and valve are used to control the waste water to 5m 3 / h flow rate enters the following steps to control the residence time of the first and second desorption 2.5h, the specific operation is as follows:

[0032] (A) One-time decolorization: The acidic wastewater flows upward through the bottom of a desorption tower...

Example Embodiment

[0039] Example 2

[0040] Acidic wastewater comes from wastewater containing sulfuric acid in dye production (sulfuric acid content is 12.5%, COD is 12510mg / L), a desorption tower is built in four stages in parallel with a volume of 12m 3 The granular activated carbon adsorption column (granular activated carbon particle size 1.2~1.4mm), the second desorption tower has a built-in two-stage parallel connection with a volume of 12m 3 The granular activated carbon adsorption column (granular activated carbon particle size 1.2~1.4mm), the neutralization device is a three-stage series neutralization pot, the temperature of the first furnace of the regeneration furnace is 880 ℃, the temperature of the second furnace is 625 ℃, and the flow rate of waste water removal is 2.5m 3 / h, residence time 4.8h, second dehydration flow rate 5m 3 / h, the residence time is 2.5h, the specific steps are operated according to the method described in Example 1, the difference is that liquid ammonia is adde...

Example Embodiment

[0041] Example 3

[0042] Acidic wastewater comes from wastewater containing hydrochloric acid in dye production (hydrochloric acid content is 6.36%, COD is 16940mg / L). Both the first desorption tower and the second desorption tower have a built-in primary volume of 12m 3 The granular activated carbon adsorption column (granular activated carbon particle size 1.2~1.4mm), the neutralization device is a three-stage series neutralization pot, the physical filtration uses a cloth bag filter, and the temperature of the first furnace is 880℃ and the temperature of the second furnace is 600℃. Use flow meters and valves to control the waste water to 4m 3 / h The flow rate enters the wastewater treatment system, and the residence time of the first and second desorption is controlled to be 3h. The specific steps are operated according to the method described in Example 1. The difference is that part of the first desorption is used as the synthetic bottom water for dye production. The liquid ...

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

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a continuous treatment method for dye industry acid wastewater. The method includes the steps of A, primary decoloring, wherein the sulfuric acid or hydrochloric acid containing acid wastewater generated in the production process of the dye industry continuously enters the bottom of a granular activated carbon adsorption column, adsorption decoloring is conducted from bottom to top, and primarily-decolored liquid is obtained; B, neutralizing, wherein the primarily-decolored liquid is neutralized to the state that the pH value ranges from 2.5 to 7, and neutralized liquid is obtained; C, secondary decoloring, wherein the neutralized liquid continuously enters the bottom of the granular activated carbon adsorption column, secondary adsorption decoloring is conducted from bottom to top, and secondarily-decolored liquid is obtained; D, concentration and crystallization; E, activated carbon regeneration, wherein saturated granular activated carbon discharged in the step A and the step C is washed with water to the state that the pH value ranges from 2 to 7, then the washed saturated granular activated carbon is fed into a regeneration system to be regenerated, the regenerated granular activated carbon enters the granular activated carbon adsorption column to be recycled, but tail gas generated by the regeneration system is absorbed by a tail gas tower.

Description

(1) Technical field [0001] The invention relates to a continuous treatment method for acidic waste water in the dye industry. (2) Background technology [0002] The dye industry, including the production process of various dyes and intermediates, will produce a large amount of acid wastewater. The traditional acid wastewater treatment method is to use lime neutralization method, but a large amount of calcium sulfate and attached organic matter will be produced during the treatment process, causing secondary pollution. secondary pollution. [0003] In recent years, there are also many reports on the treatment of acidic wastewater, among which more introductions are made on acidic wastewater to reclaim ammonium sulfate (sodium sulfate) or ammonium chloride (sodium chloride) through steps such as neutralization and decolorization, such as patents such as CN103130370A, CN103241885A, and CN102826673A , this method not only realizes wastewater treatment, but also turns waste into...

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): C02F9/10C02F1/28
CPCC02F1/04C02F1/283C02F1/52C02F1/66C02F9/00C02F2001/5218C02F2101/101C02F2101/12C02F2301/08C02F2303/16
Inventor 韩伟张友珍李世华祝培明张海斌李君金鑫伟阮萍萍
Owner ZHEJIANG LONGSHENG GROUP
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