A kind of preparation method of composite decolorizing flocculant used for printing and dyeing wastewater treatment

A technology for decolorizing flocculants and printing and dyeing wastewater is applied in the field of preparation of composite decolorizing flocculants, which can solve the problems of high treatment cost, unutilized acid, limited adsorption capacity, etc., and achieves improved removal effect and excellent decolorization effect.

Active Publication Date: 2016-09-14
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods have certain treatment effects, they all have certain disadvantages: in the adsorption method, activated carbon is used as the adsorbent, the treatment cost is high, and the activated carbon is not easy to regenerate; Solid waste such as mud and its modified products are used as adsorbents. Although the cost is low, the adsorption capacity is limited, and it is easy to generate a large amount of waste residue and cause secondary pollution.
These methods have the following disadvantages: the amount of sludge produced by the neutralization of lime milk is large, and the iron and acid in it are wasted; adding iron scraps to recover ferrous salts, the value of the recovered products is not high, and waste gas is generated during the treatment process, causing secondary pollution; The preparation of red iron oxide only recovers the iron in it, and the acid in it is not utilized
At present, there is no feasible treatment method for this kind of waste residue, and it is generally disposed of by landfill or stacking, which has obvious secondary pollution and potential safety hazards.

Method used

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  • A kind of preparation method of composite decolorizing flocculant used for printing and dyeing wastewater treatment
  • A kind of preparation method of composite decolorizing flocculant used for printing and dyeing wastewater treatment
  • A kind of preparation method of composite decolorizing flocculant used for printing and dyeing wastewater treatment

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preparation example Construction

[0032] The preparation process block diagram of the present invention is as figure 1 shown.

[0033] Examples 1-10 are preparation examples of the composite decolorizing flocculant for printing and dyeing wastewater, and Examples 11-12 are application examples of the composite decolorizing flocculant for printing and dyeing wastewater.

[0034] The component content of iron and steel pickling waste water in the embodiment 1~4 is: total iron concentration is 2.45mol / L, ferrous concentration is 2.25mol / L, H + Concentration is 1.24mol / L, density ρ=1.19g / cm 3 ; The content of each component of the aluminum-containing waste slag is: the mass fraction of aluminum hydroxide is 55%, Cu 2+ The mass fraction is 0.01%, Cr 3+ The mass fraction is 0.12%, Ni 2+ The mass fraction is 0.05%, Zn 2+ The mass fraction is 0.03%.

[0035] The component content of iron and steel pickling waste water in embodiment 5~7 is: total iron concentration is 2.56mol / L, ferrous concentration is 2.34mol / L...

Embodiment 1

[0038] (1) Add 6kg of iron and steel pickling waste water and 0.516kg of mass fraction of 98% sulfuric acid into a 10L acid-resistant closed reactor, then add 0.240kg of aluminum-containing waste slag from aluminum processing, heat up to 90°C and stir until dissolved, statically The supernatant is transferred to a 50L acid-resistant closed reactor, and the liquid containing insoluble slag in the lower layer is transferred to the reactor after being centrifuged to filter the residue by a centrifuge;

[0039] (2) Add 11.4kg magnesium sulfate heptahydrate, 1.2kg manganese sulfate monohydrate and 1.2kg zinc sulfate heptahydrate to the above-mentioned 50L acid-resistant closed reactor, add 16L water, heat up to 80°C and stir until the solid matter is completely dissolved; then add After oxidative hydrolysis of 200g of sodium chlorate for 1 hour, slowly add 135.6g of γ-aminopropyltriethoxysilane and continue the reaction at 70°C for 3 hours;

[0040] (3) Lower the temperature to 40°...

Embodiment 2

[0042] (1) Add 6kg of steel pickling wastewater and 0.552kg of sulfuric acid with a mass fraction of 98% into a 10L acid-resistant closed reactor, then add 0.300kg of aluminum-containing waste slag from aluminum material processing, heat up to 80°C and stir until dissolved, statically The supernatant is transferred to a 50L acid-resistant closed reactor, and the liquid containing insoluble slag in the lower layer is transferred to the reactor after being centrifuged to filter the residue by a centrifuge;

[0043] (2) Add 7.2kg magnesium sulfate heptahydrate, 0.6kg manganese sulfate monohydrate and 0.9kg zinc sulfate heptahydrate to the above-mentioned 50L acid-resistant closed reactor, add 15.5L water, heat up to 75°C and stir until the solid matter is completely dissolved; then After adding 149.8g of sodium chlorate for oxidative hydrolysis for 0.7h, slowly add 115.8g of γ-glycidyl etheroxypropyltrimethoxysilane and continue the reaction at 75°C for 2.5h;

[0044] (3) reduce ...

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Abstract

The invention relates to a preparation method of a composite decoloring flocculant for printing and dyeing wastewater treatment. The preparation method comprises the following steps: firstly dissolving aluminum-containing waste residues by using acid-washing wastewater and sulfuric acid, adding Mg<2+>, Zn<2+> and Mn<2+>, adding chlorate to oxidize Fe<2+> and consume acid, so as to enable Fe<3+>, Al<3+> and the like to be subjected to hydrolytic polymerization; then adding a silane coupling agent for ydrolysis and telomerization, adding a dicyandiamide-triethylene tetramine condensation polymer, and performing heat preservation and curing to obtain the composite decoloring flocculant. The composite decoloring flocculant obtained by the preparation method comprises a variety of components facilitating the action with wastewater pollutants, is larger in molecular aggregate and excellent in decoloring, COD-removing and turbidity-removing effects on printing and dyeing wastewater under the synergistic effect of all the components and does not introduce new pollution; generally, the GB4287-2012 emission standards can be met only through one-step flocculation, so that the process is simplified, and the cost is reduced. According to the preparation method provided by the invention, the steel and iron acid washing wastewater as well as aluminum-containing waste residues from aluminum processing can be simultaneously treated, so that the resource utilization is realized; the preparation method is simple in process, easy for realization of industrialization and broad in application prospect.

Description

technical field [0001] The invention belongs to the field of printing and dyeing wastewater treatment, and in particular relates to a preparation method of a composite decolorizing flocculant for printing and dyeing wastewater treatment. Background technique [0002] Dye is a substance that can make a certain color adhere to the fiber and is not easy to fall off and change color. my country's dyestuff production accounts for 60% of the world's total dyestuff output, ranking first in the world. Discharge of about 744m per ton of dye produced 3 Wastewater, about 10% to 20% of dyes are released into water bodies during production and use, and 75,600 to 151,200 tons of dyes enter water bodies directly in the form of printing and dyeing wastewater every year. my country's annual printing and dyeing wastewater is about 1.6 billion tons, ranking sixth in my country's entire industrial wastewater discharge. Due to the large amount of printing and dyeing wastewater, the content of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 刘立华徐国荣曾荣今杨刚刚丁丽莉
Owner HUNAN UNIV OF SCI & TECH
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