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Treatment method for dye wastewater

A treatment method and dye wastewater technology, applied in the direction of neutralization water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of ammonia nitrogen exceeding the standard, calcium carbonate cannot be recycled, large activated carbon, etc. , to achieve the effects of less organic residues, equipment corrosion resistance, low automation requirements, and low wastewater requirements

Active Publication Date: 2021-11-19
ZHEJIANG RUNTU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that (1) a large amount of waste activated carbon is produced; (2) there is a large amount of ammonium sulfate in the calcium carbonate, which causes the ammonia nitrogen in the waste water after neutralization to exceed the standard; enrichment, eventually resulting in calcium carbonate that cannot be recycled

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  • Treatment method for dye wastewater

Examples

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Effect test

Embodiment 1

[0063] In a large dye company in Zhejiang, the sulfuric acid wastewater produced during the dye production process contains about 2.6wt% sulfuric acid and a COD of 4800mg / L. Include the following steps:

[0064] Step 1. Neutralize the sulfuric acid-containing wastewater in batches with light calcium carbonate (content 97%) (subsequent neutralization with the calcium carbonate filter cake obtained from the reaction, and supplement with new calcium carbonate) to obtain a suspension, and control the pH of the neutralization end point = 4.0 to 5.0.

[0065] Step 2, separating the suspension obtained in step 1 by hydraulic filtration to obtain the first solid product (calcium sulfate filter cake) and a clear liquid with low salt content. The water content of the calcium sulfate filter cake is 45%; the COD of the clear liquid with low salt content is 1630 mg / L, and the salt content is less than 0.5%, and the clear liquid can be used for biochemical treatment.

[0066] Step 3. Slur...

Embodiment 2

[0074] In a dye company in Zhejiang, the sulfuric acid wastewater produced during the dye production process contained about 7.1% sulfuric acid and COD was 14000mg / L. Include the following steps:

[0075] Step 1. Neutralize the sulfuric acid-containing wastewater in batches with light calcium carbonate (97% content) (subsequent neutralization with the calcium carbonate filter cake obtained from the reaction, and supplement with new calcium carbonate) to obtain a suspension and control the neutralization end point pH=4.0~5.0.

[0076] Step 2, separating the suspension obtained in step 1 by hydraulic filtration to obtain the first solid product (calcium sulfate filter cake) and a clear liquid with low salt content. Wherein the first solid product (calcium sulfate filter cake) contains 50% water; the clear liquid with low salt content has a COD of 3150 mg / L and a salt content of less than 0.5%, and the clear liquid can be used for biochemical treatment.

[0077] Step 3. Beat th...

Embodiment 3

[0085] In a dye company in Zhejiang, the sulfuric acid wastewater produced during the dye production process contained about 4.8% sulfuric acid and COD was 8500mg / L. Include the following steps:

[0086] Step 1. Neutralize the sulfuric acid-containing wastewater in batches with light calcium carbonate (97% content) (subsequent neutralization with the calcium carbonate filter cake obtained from the reaction, and supplement with new calcium carbonate) to obtain a suspension and control the neutralization end point pH=4.0~5.0.

[0087]Step 2, separating the suspension obtained in step 1 by hydraulic filtration to obtain the first solid product (calcium sulfate filter cake) and a clear liquid with low salt content. Wherein the first solid product (calcium sulfate filter cake) contains 30% water; the clear liquid COD of low salt content is 2650mg / L, and the salt content is less than 0.5%, and this clear liquid can be used for biochemical treatment.

[0088] Step 3. Beat the first...

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Abstract

The invention provides a treatment method for dye wastewater. The dye wastewater contains sulfuric acid. The treatment method comprises the following steps of: 1, neutralizing the dye wastewater by using calcium carbonate, and separating to obtain a first solid product and a first clear liquid; and 2, treating the first solid product by using ammonium bicarbonate, and carrying out solid-liquid separation to obtain a second solid product containing calcium carbonate and a second clear liquid. With the treatment method for the dye wastewater disclosed by the invention adopted, the problem of biochemical bacteria intolerance caused by over-high salt content and over-high ammonia nitrogen in wastewater during biochemical treatment is avoided; toxic and harmful organic matters in the wastewater are subjected to biochemical treatment and organic solid waste incineration, and the treatment method is simple and thorough; obtained ammonium sulfate and ammonium chloride have few organic matter residues and high quality; and except the organic solid wastes, no other hazardous wastes are generated.

Description

technical field [0001] The invention relates to the fields of water pollution control and waste water treatment, in particular to a treatment method for dye waste water containing low-concentration sulfuric acid. Background technique [0002] During the dye production process, a lot of mother liquor water containing sulfuric acid will be produced, and it will contain more organic matter. For the treatment of this kind of acid-containing wastewater, wastewater with high sulfuric acid concentration can be treated by using ammonia water to neutralize and then evaporate and recover ammonium sulfate products. poor. [0003] In the patent document CN108569812A, active carbon is used to adsorb and remove organic matter in wastewater containing low-concentration sulfuric acid, and then calcium carbonate is used to neutralize the sulfuric acid in the wastewater, and the generated calcium sulfate is beaten, and mixed with ammonium carbonate for metathesis reaction to generate ammoniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/244C01C1/16C01F11/18C02F1/66C02F101/10
CPCC01C1/244C01C1/164C01F11/18C02F1/66C02F2101/101C01P2006/80
Inventor 刘仲明丁兴成沈振雄王汝李家琪陈清章妙
Owner ZHEJIANG RUNTU
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