Composite coagulant used for treating printing and dyeing waste water and preparing method thereof

A printing and dyeing wastewater and coagulant technology, applied in the field of water treatment, can solve the problems of poor dye decolorization effect, complicated preparation process, secondary pollution, etc., and achieve good decolorization performance, simple preparation process, and fast sedimentation speed

Active Publication Date: 2016-07-20
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: based on the above problems, the present invention provides a composite coagulant for the treatment of printing and dyeing wastewater and its preparation method, which solves the problem of complicated preparation process, high cost and two problems of flocculant for the treatment of printing and dyeing wastewater. Secondary pollution, poor decolorization effect on dyes with good water solubility or low molecular weight

Method used

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  • Composite coagulant used for treating printing and dyeing waste water and preparing method thereof
  • Composite coagulant used for treating printing and dyeing waste water and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] to 100m 3 Add 50t of industrial by-product waste hydrochloric acid (HCl%=18.9%) successively in the heat preservation reactor, and 30t of aluminum-containing waste slag in the aluminum profile industry (Al 2 o 3 %=14.0%), 40 ℃ normal pressure insulation and stirring for 1h until the aluminum slag is completely dissolved to obtain Al 2 o 3 % = 5.2%, HCl% = 2.2% aluminum slag water; add 0.08tMTR2400 heavy metal scavenger, stir and react for 0.5h, plate and frame filter to obtain light yellow clear aluminum-containing liquid; add industrial grade CaCl 2 1t (CaO%=47%), fully stirred until completely dissolved, continued the normal pressure heat preservation and stirring reaction for 0.5h, and then discharged, the supernatant liquid after natural precipitation was the liquid composite coagulant, and the finished product Al was tested. 2 o 3 %=5.1%, CaO%=0.5%, HCl%=2.0%, insoluble %<0.4%.

Embodiment 2

[0019] to 100m 3 Add 40t (HCl%=26.4%) of industrial by-product waste hydrochloric acid successively in the thermal insulation reaction kettle, 20t (Al 2 o 3 %=19.3%), 50 ℃ normal pressure insulation and stirring for 1.5h until the aluminum slag is completely dissolved to obtain Al 2 o 3 % = 6.4%, HCl% = 3.0% aluminum slag water; add 0.06tMTR2400 heavy metal scavenger, stir and react for 0.5h, plate and frame filter to obtain light yellow clear aluminum-containing liquid; add industrial grade CaCl 2 1t (CaO%=47%), fully stirred until completely dissolved, continued the normal pressure heat preservation and stirring reaction for 0.75h, and then discharged, the supernatant liquid after natural precipitation was the liquid composite coagulant, and the finished product Al 2 o 3 %=6.3%, CaO%=0.7%, HCl%=2.8%, insoluble matter%<0.4%.

Embodiment 3

[0021] to 100m 3 Add 30t of industrial by-product waste hydrochloric acid (HCl%=33.7%) successively in the heat preservation reactor, and 10t of aluminum-containing waste residue in the aluminum profile industry (Al 2 o 3 %=28.6%), 60 ℃ normal pressure insulation and stirring for 2h until the aluminum slag is completely dissolved to obtain Al 2 o 3 % = 7.1%, HCl% = 4.6% aluminum slag water; add 0.04tMTR2400 heavy metal scavenger, stir and react for 0.5h, plate and frame filter to obtain light yellow clear aluminum-containing liquid; add industrial grade CaCl 2 0.6t (CaO% = 47%), fully stirred until completely dissolved, continued the normal pressure heat preservation and stirring reaction for 1 hour, and then discharged, the supernatant liquid after natural precipitation was the liquid composite coagulant, and the finished product Al 2 o 3 %=7.0%, CaO%=0.6%, HCl%=4.4%, insoluble matter%<0.4%.

[0022] Composite coagulant effect evaluation that the present invention makes ...

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Abstract

The invention relates to a preparing method of a composite coagulant used for treating printing and dyeing waste water.The method comprises the steps that an industrial by-product waste hydrochloric acid and aluminum profile industry aluminum-containing waste residues are added into a reaction kettle sequentially, stirring is carried out in a heat-preserving mode at normal pressure, and aluminum residue water with AlCl3 as an effective ingredient is obtained; a liquid heavy metal capture agent is put into the aluminum residue water, stirring is carried out, and plate-frame pressure filtration is carried out to obtain faint yellow clear aluminum-containing liquid; industrial-grade CaCl2 is put into the aluminum-containing liquid, and stirring is carried out; the stirring reaction is carried out in a heat-preserving mode at the normal pressure, and supernatant liquid subjected to natural sedimentation is the liquid composite coagulant.The preparing method has the advantages that the preparation technology of the composite coagulant is simple, the raw materials are wide in source, and cost is low; the product performance is stable, the added amount of chemical is small, floc is compact, and the sedimentation speed is high; the composite coagulant has good decoloration performance and a high COD removal rate, and the actual printing and dyeing waste water chroma removing rate and the COD removal rate can be 10-15% higher than those of PAC sold in the market.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a composite coagulant for treating printing and dyeing wastewater and a preparation method thereof. Background technique [0002] my country is a big country in textile printing and dyeing, and the textile printing and dyeing industry is a large discharge of industrial wastewater. The treatment of printing and dyeing wastewater has always been the focus and difficulty of my country's wastewater treatment research. The main characteristics of printing and dyeing wastewater are complex organic components, many refractory substances, high chroma, and large changes in water quality. For this reason, many technologies have been used to treat printing and dyeing wastewater. At present, although there are many kinds of flocculants used for printing and dyeing wastewater treatment, these flocculants not only have complicated preparation process, high cost, and secondary pollution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/30
CPCC02F1/5236C02F2103/30
Inventor 左选凤蒋银峰王桂玉
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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