Method for preparing composite flocculant

A coagulant and inorganic composite technology, applied in the fields of environmental engineering and chemical engineering, can solve the problem of weak electric neutralization, and achieve the effects of improving surface charge, improving flocculation ability, and wide source of raw materials

Inactive Publication Date: 2009-05-06
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its anionic nature, th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 2.5mLSiO 2 Add 10mL of 1:1 hydrochloric acid solution dropwise to 6.5% dilute water glass solution with stirring until the pH value is 3-4. Then add 2mg / L C-PAM solution and stir for 2h (rotating speed: 100r / min), then use 1mol / L NaOH solution to adjust the pH value to 1-2, and mix well to obtain a slightly white liquid which is the composite flocculant. The turbidity removal rate can reach 87.21% by using it to treat the simulated water sample of kaolin with a turbidity of 118.38FTU.

Embodiment 2

[0012] Take 2.5mLSiO 2 Add 10mL of 1:1 hydrochloric acid solution dropwise to 6.5% dilute water glass solution with stirring until the pH value is 3-4. Then add 3mg / L C-PAM solution, stir for 2 hours (rotation speed: 100r / min), adjust the pH value to 1-2 with 1mol / L NaOH solution, mix well, and obtain a slightly white liquid which is the composite flocculant. The turbidity removal rate can reach 86.89% by using it to treat the simulated water sample of kaolin with a turbidity of 118.38FTU.

Embodiment 3

[0014] Take 3.0mLSiO 2 Add 10mL of 1:1 hydrochloric acid solution dropwise to 6.5% dilute water glass solution with stirring until the pH value is 3-4. Then add 2mg / L C-PAM solution and stir for 2h (rotating speed: 100r / min), then use 1mol / L NaOH solution to adjust the pH value to 1-2, and mix well to obtain a slightly white liquid which is the composite flocculant. The turbidity removal rate can reach 74.38% by using it to treat the simulated water sample of kaolin with a turbidity of 118.38FTU.

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Abstract

The invention belongs to the environmental engineering field, and relates to the treatment of water and wastewater, the preparation of flocculant, and the like. The invention discloses a preparation method for organic-inorganic composite flocculant. The method takes sodium silicate as a raw material for preparing polysilicate inorganic polymer flocculant and mixes polysilicate solution and cationic polyacrylamide for copolymerization so as to obtain the composite flocculant. The prepared composite flocculant can exert the synergic action of the polysilicate solution and the cationic polyacrylamide. The turbidity removal rate for the composite flocculant kaolin simulation water sample reaches 90.81 percent; the turbidity removal rate by using the polysilicate flocculant is only 45.72 percent; the turbidity removal rate by using the positive polyacrylamide ion is only 56.34 percent; however, the turbidity removal rate by using the polysilicate flocculant and the positive polyacrylamide ion simutanously is 74.62 percent.

Description

technical field [0001] The invention belongs to the fields of environmental engineering and chemical engineering, and relates to water and waste water treatment, sludge dehydration, synthesis of fine chemicals and the like. Background technique [0002] Flocculation is an important physicochemical method in water and wastewater treatment. Flocculation can effectively remove 80% to 95% of suspended matter and 65% to 95% of colloidal matter, which plays an important role in reducing the COD value in water. Flocculation has a stable effect on removing bacteria and viruses in water. Through flocculation purification, generally more than 90% of microorganisms and viruses in water can be transferred into sludge together, making it easier to disinfect and sterilize water for further treatment. Efficient flocculation technology should be based on flocculants with excellent performance. The quality of flocculants is one of the key factors that determine the flocculation effect and ...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 刘转年
Owner XIAN UNIV OF SCI & TECH
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