Preparation method of starch-based composite flocculant and application thereof

A composite flocculant, starch-based technology, applied in the field of water treatment, can solve the problems of difficult to achieve decolorization, limited degree of polymerization, difficult to degrade, etc. Effect

Inactive Publication Date: 2011-05-18
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using traditional inorganic flocculants such as polyaluminum chloride (PAC) and polyferric sulfate (PFS) to treat printing and dyeing wastewater, the amount of sludge is large, and it is difficult to achieve ideal decolorization and COD reduction. Cr In recent years, it has been found in hygiene that the occurrence of Alzheimer's disease is related to the residual accumulation of aluminum ions
Synthetic polymer flocculants such as polyacrylamide have the advantages of less dosage, less influence by coexisting salts, and less sludge generation, but the residual monomers of this type of polymer have "three-induced" effects (teratogenic, Carcinogenic, mutagenic), and difficult to degrade
In order to improve the decolorization efficiency, dicyandiamide-formaldehyde (DCD-HCHO) condensation polymers have b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weigh sodium silicate (Na 2 SiO 3 9H 2 (2) 14.2 grams are mixed with 500mL 0.1mol / l sodium silicate solution, join in the sulfuric acid solution, make its pH value be 1.0, stir rapidly until light blue gradually appears in the solution to obtain polysilicic acid;

[0024] (2) Add 52 ml of 0.5 mol / l aluminum sulfate solution and 15 ml of 0.5 mol / l ferric sulfate solution to the polysilicic acid successively, adjust the pH value to 2.0, stir well for 2 hours, polycondensation reaction occurs, and obtain polysilicon aluminum iron.

[0025] (3) Put 3.5mL of 20% starch solution in a water bath at 55°C, add NaOH slowly and uniformly according to NaOH / starch (mass ratio) = 1:8, stir and react for 1 hour to obtain an alkaline modified starch solution;

[0026] (4) Adjust the pH value of the alkaline modified starch solution to 2.0 with sulfuric acid, then fully mix the alkaline modified starch and polysilicon aluminum iron according to starch: Si (mass ratio) = 0.5: 1, an...

Embodiment 2

[0029] (1) Weigh sodium silicate (Na 2 SiO 3 9H 2 (0) 14.2 grams are mixed with 500mL 0.1mol / l sodium silicate solution, join in the sulfuric acid solution, make its pH value reach 2.0, stir rapidly until light blue gradually appears in the solution to obtain polysilicic acid;

[0030] (2) Add 156 ml of 0.5 mol / l aluminum sulfate solution and 10 ml of 0.5 mol / l ferric sulfate solution to the polysilicic acid successively, adjust the pH value to 1.0, stir well for 2 hours, polycondensation reaction occurs, and obtain polysilicon aluminum iron.

[0031] (3) Put 8.75mL of 16% starch solution in a 55°C water bath, add NaOH slowly and uniformly at a constant speed according to NaOH / starch (mass ratio) = 1:10, and stir for 1 hour to obtain an alkaline modified starch solution;

[0032] (4) Adjust the pH value of the alkaline modified starch solution to 2.0 with sulfuric acid, then fully mix the alkaline modified starch and polysilicon aluminum iron according to starch: Si (mass ra...

Embodiment 3

[0035] (1) Weigh sodium silicate (Na 2 SiO 3 9H 2 (0) 42.6 grams are mixed with 500mL 0.3mol / l sodium silicate solution, join in the sulfuric acid solution, make its pH value be 3.0, stir quickly until light blue gradually appears in the solution to obtain polysilicic acid;

[0036] (2) Add 310 ml of 0.5 mol / l aluminum sulfate solution and 30 ml of 0.5 mol / l ferric sulfate solution to the polysilicic acid successively, adjust the pH value to 3.0, stir well for 2 hours, polycondensation reaction occurs, and obtain polysilicon aluminum iron.

[0037] (3) Put 28mL of 15% starch solution in a 55°C water bath, add NaOH slowly and uniformly at a constant speed according to NaOH / starch (mass ratio) = 1:12, and stir for 1 hour to obtain an alkaline modified starch solution;

[0038](4) Adjust the pH value of the alkaline modified starch solution to 2.0 with sulfuric acid, then fully mix the alkaline modified starch and polysilicon aluminum iron according to starch: Si (mass ratio) =...

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PUM

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Abstract

The invention discloses a preparation method of a starch-based composite flocculant and application thereof. The method is characterized by taking sodium silicate, aluminium salt and iron salt as main raw materials and water as a reaction solvent to prepare ferro-silico aluminium and compounding an alkaline modified starch solution with the ferro-silico aluminium to prepare the starch-based composite flocculant. The starch-based composite flocculant is mainly applied to printing and dyeing wastewater treatment. The starch-based composite flocculant has the advantages of high decolorization rate and CODCr removal rate, high sedimentation velocity, less sludge quantity and no secondary pollution.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a preparation method and application of a starch-based composite flocculant. Background technique [0002] With the promulgation of a series of national and local restrictive policies on the printing and dyeing industry and the continuous rise of water and sewage charges, printing and dyeing enterprises are paying more and more attention to the treatment and reuse of wastewater. However, there are various factors affecting the reuse of printing and dyeing wastewater, the most critical factor of which is chroma. Especially in recent years, the stability of dye structure has been greatly improved, which further increases the difficulty of decolorization. Flocculation is considered to be one of the most extensive and economical decolorization methods at present. Compared with other methods, the flocculation method has low processing cost and small footprint. [0003] Whe...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F103/30
Inventor 林亲铁刘国光刘千钧
Owner GUANGDONG UNIV OF TECH
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