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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
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 ammonium chloride (sodium chloride) through steps such as neutralization and decolorization of acidic wastewater, such as patents such as CN103130370A, CN103241885A, and CN102826673A , this method not only realizes wastewater treatment, but also turns waste into treasure, but they all use powdered activated carbon as an adsorbent for adsorption and decolorization. Since powdered activated carbon cannot be regenerated, more waste residue will be generated after use. According to the new national regulations , the waste residue belongs to hazardous waste and is difficult to handle

Method used

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  • Continuous treatment method for dye industry acid wastewater
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Examples

Experimental program
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Effect test

Embodiment 1

[0031] refer to figure 2 , the acid wastewater comes from the sulfuric acid wastewater in the dye production (sulfuric acid content is 5.68%, COD is 11380mg / L), the first desorption tower and the second desorption tower are built 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 physical filtration uses a bag filter, and the temperature of the primary furnace (3) of the regeneration furnace is controlled at 880 ° C, and the temperature of the secondary furnace is 880 ° C. (7) The temperature is 620°C, using flowmeters and valves to control the waste water to 5m 3 The / h flow rate enters the following steps, and the residence time of the first and second removals is controlled to 2.5h. The specific operations are as follows:

[0032] (A) Primary decolorization: Acidic wastewater enters the bottom of a desorption tower through a ...

Embodiment 2

[0040] Acidic wastewater comes from sulfuric acid wastewater in dye production (sulfuric acid content is 12.5%, COD is 12510mg / L), and the volume of a desorption tower built in four-stage parallel connection is 12m 3 Granular activated carbon adsorption column (granular activated carbon particle size 1.2 ~ 1.4mm), the volume of the second desorption tower built in parallel is 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 controlled at 880 ° C, the temperature of the second furnace is 625 ° C, and the flow rate of the first waste water is controlled at 2.5 m 3 / h, residence time 4.8h, two off flow rate 5m 3 / h, residence time 2.5h, concrete steps are operated by the method described in embodiment 1, and difference is to add liquid ammonia to neutralize to pH value 6.0 during neutr...

Embodiment 3

[0042] The acidic wastewater comes from the wastewater containing hydrochloric acid in dye production (the content of hydrochloric acid is 6.36%, and the 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 bag filter, and the temperature of the first furnace of the regeneration furnace is 880 ° C, and the temperature of the second furnace is 600 ° C Using flow meters and valves to control waste water at 4m 3 The / h flow rate enters the wastewater treatment system, and the first and second removal residence times are controlled for 3h. The specific steps are operated according to the method described in Example 1. The difference is that part of the first removal is used as synthetic bottom water for dye produ...

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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

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Application Information

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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
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