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Compound biological flocculant as well as preparation method and application thereof

A biological flocculant and microbial flocculant technology, which is applied in the field of water treatment, can solve the problems of difficult control of the types and proportions of active ingredients, and achieve the effects of environmental friendliness, good flocculation effect, and low residual turbidity

Active Publication Date: 2013-02-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of technology has the disadvantage of difficulty in regulating the types and proportions of active ingredients.

Method used

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  • Compound biological flocculant as well as preparation method and application thereof
  • Compound biological flocculant as well as preparation method and application thereof
  • Compound biological flocculant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]A composite biological flocculant, which is prepared by compounding microbial flocculants and natural plant rubber powder modified anionic polymer flocculants, and its main active ingredients are acidic polysaccharides and anionic cellulose synthesized by microorganisms.

[0032] The microbial flocculant is produced by fermentation of the flocculant-producing fungus Aspergillus fumigatus HHE-A8 isolated from sludge in our laboratory. Its preparation method is as follows:

[0033] (1) Preparation of the seed solution of the flocculant-producing bacteria: insert the activated spores of Aspergillus fumigatus (Aspergillus fumigatus) HHE-A8 into 50mL of the sterilized seed solution medium, and place them on a shaking table at a temperature of 30°C. The seeds were obtained by culturing for 2 days.

[0034] (2) Fermentation production of flocculant: draw 0.1mL from the spare spore suspension of Aspergillus fumigatus (Aspergillus fumigatus) HHE-A8 and put it into a 250mL Erlenm...

Embodiment 2

[0049] Improvement of PAC flocculation effect by compound flocculation of PAC+CBF-1

[0050] This example studies the effect of CBF-1 and PAC compound flocculation of kaolin suspension in Example 1, and compares the superiority of CBF-1+PAC compound flocculation with PAC flocculation alone. In this embodiment, every m 3 The amount of PAC added to the kaolin suspension is 4.4~26.1g, and the amount of CBF-1 added is 0.5~2.0g.

[0051] Because the polymers with carboxyl groups, hydroxyl groups, phosphoric acid groups, etc. in CBF-1 can absorb and bridge with the hydroxyl polymers of kaolin and PAC to promote the formation and growth of flocs, thereby improving the flocculation performance of PAC. It can be seen from Table 2 that the coagulation aid of CBF can significantly enhance the turbidity removal performance of PAC. Such as PAC (4.35g / m 3 ~8.70g / m 3 )+CBF (0.5g / m 3 ~2.0g / m 3 ) The turbidity removal rate of the compound flocculation is 13.6%~114.9% higher than that of ...

Embodiment 3

[0056] PAC+CBF-1 compound flocculation to reduce residual aluminum content in effluent

[0057] This example investigates the change of residual aluminum content in the effluent of PAC+CBF-1 compound kaolin suspension. and at every m 3 In the kaolin suspension, the dosage of PAC was fixed at 13g, and the dosage of CBF-1 was 0.0~8.0g.

[0058] PAC is a commonly used inorganic coagulant, but the unreacted part will remain in the water body during the coagulation process, so that there will be residual aluminum in the coagulation water. There are reports that the aluminum element in the water body is harmful to plants and humans. Negative Effects. In this study, it was found that PAC+CBF-1 flocculation can effectively reduce the residual aluminum content in effluent. It can be seen from Table 3 that adding 0.5g / m2 to CBF-1 3 Wastewater~8.0g / m 3 In the case of wastewater, the residual aluminum content in the effluent can be reduced to 130mg / m 3 Below, realize the reduction o...

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Abstract

The invention discloses a compound biological flocculant as well as a preparation method and application thereof. The compound biological flocculant is prepared by compounding a microbial flocculant and a natural polymer anion modified flocculant; the natural polymer anion modified flocculant is obtained by modifying gel-contained wood flour through carboxymethyl; the microbial flocculant is generated through fermentation of aspergillus fumigatus HHE-A8; and the aspergillus fumigatus is collected by the China Center for Type Culture Collection (CCTCC for short), the collection number of the aspergillus fumigatus is CCTCC NO.M2012081, and the collection data of the aspergillus fumigatus is March 14, 2012. When the prepared compound biological flocculant is compounded with aluminum polychlorid for use, the flocculation effect is good, the dosage of the flocculant can be greatly decreased, and the aluminiferous concentration of effluent is low; and the compound biological flocculant can be used for treating tobacco wastewater, alga wastewater, ore washing wastewater, starch wastewater and the like.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a novel flocculant. It specifically relates to a preparation method and a use method for preparing a composite biological flocculant by compounding a microbial flocculant and a natural polymer anion modified flocculant. Background technique [0002] The flocculation process is widely used in water supply, industrial wastewater, urban sewage treatment and sludge dewatering process, and is often an essential and important link. The flocculant directly determines the quality of effluent water and the cost of water treatment. In the process of flocculation treatment, coagulants such as iron salts or aluminum salts are generally added to destabilize colloidal suspensions in water, and then organic polymer flocculants are added to form large flocs and precipitate through bridging and netting to achieve solid-liquid Separation, thereby removing colloidal suspended matter pollutants in the ...

Claims

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Application Information

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IPC IPC(8): C02F1/56
Inventor 胡勇有雷志斌于琪
Owner SOUTH CHINA UNIV OF TECH
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