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Biological compound flocculant and application thereof

A microbial flocculant and flocculant technology, applied in the field of water treatment, can solve problems such as unstable solution viscosity, insufficient charge density, and insufficient molecular weight, and achieve low cost, reduced residual turbidity, and high turbidity removal rate Effect

Active Publication Date: 2013-10-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the microbial flocculant is used alone, calcium chloride needs to be added as a coagulant aid, the dosage is relatively high, and the cost is high
Chitosan has a high cost (the current market price is mostly above 150 yuan / kg), and it can only be dissolved in weak acid, and the solution viscosity is unstable, and its use effect is poor under alkaline conditions. As a flocculant, its molecular weight is not large enough. Charge density not high enough

Method used

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  • Biological compound flocculant and application thereof
  • Biological compound flocculant and application thereof
  • Biological compound flocculant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Treatment of Kaolin Suspension with Biological Composite Flocculant

[0049] (1) Polyaluminum chloride (PAC) was purchased from Henan Zhengzhou Yisheng Chemical Co., Ltd., Al 2 o 3 The content is 23.30%, and it is prepared into a 5g / L solution when used.

[0050] (2) Microbial flocculant (MBF) is a microbial flocculant produced by the fermentation of the original variety of Aspergillus fumigatus, and it is prepared into a 2.0g / L solution before use.

[0051] (3) Preparation of modified chitosan solution (CAD): Firstly, 3 g of chitosan (CTS) was dissolved in 140 mL of 2% acetic acid solution, the reaction temperature was 50 ° C, nitrogen gas was introduced, and stirring was started. After stirring for 5 minutes, the chitosan was dissolved, and 6 milliliters of 5 mmol / L ammonium persulfate solution was slowly added dropwise. After 15 minutes, accurately weigh 7.00 g of acrylamide, place it in a three-necked flask, and start recording the reaction time. After adding ac...

Embodiment 2

[0059] Treatment of Chlorella Suspension with Biological Compound Flocculant

[0060] The green algae culture solution was diluted to a suspension with a turbidity of 7.5 NTU and a pH of 7.63. Polyaluminum chloride was used as coagulant to test the flocculation effect of biocomposite flocculant.

[0061] The dosage of polyaluminum chloride is 3mg / L (as Al 2 o 3 count). The dosage of biological compound flocculant (MBF, CAD mass ratio is 5:3) is 0, 0.5, 1.0, 1.5, 2.0, 3.0, 4.0mg / L. The flocculation process is as described in Example 1. Experimental results such as Figure 5 ,Depend on Figure 5 It can be seen that when the dosage of microbial flocculant and modified chitosan is small (<1mg / L), as the dosage increases, the flocculation effect becomes better, and the flocculation effect becomes better when the dosage exceeds 1.5mg / L. The effects start to get worse. When adding 3mg / L of polychlorination and 1.5mg / L of microbial flocculant and modified chitosan, the turbidi...

Embodiment 3

[0063] Treatment of Tobacco Wastewater with Biological Compound Flocculants

[0064] The waste water from the tobacco production workshop of China Tobacco Group in Guangzhou has a COD of about 100mg / L, a turbidity of 22.0NTU, and a raw water pH of 6.5, which is adjusted to 7.65 by adding sodium hydroxide solution. Polyaluminum chloride was used as coagulant to test the flocculation effect of biocomposite flocculant.

[0065] The dosage of polyaluminum chloride is 3mg / L (as Al 2 o 3 count). The dosage of biological compound flocculant (MBF, CAD mass ratio is 5:3) is 0, 0.5, 1.0, 1.5, 2.0, 3.0mg / L. The flocculation process is as described in Example 1. The experimental results are as follows Figure 5 ,Depend on Figure 5 It can be seen that the flocculation effect is the best when the polyaluminum chloride is added at 3.0mg / L, and the microbial flocculant and modified chitosan are added at 1.5mg / L, which can reduce the turbidity of wastewater from 22.0NTU to 0.85NTU. Eff...

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Abstract

The invention relates to a biological compound flocculant and an application thereof. The biological compound flocculant comprises a microbial flocculant and a modified chitosan solution, wherein the microbial flocculant is generated by fermenting aspergillus fumigatus HHE-A8, the aspergillus fumigatus is collected by the China center for type culture collection (CCTCC), the collection number is CCTCC NO: M 2012081, and the collection date is March 14th, 2012. When the biological compound flocculant and polymeric aluminum chloride are used in a compound mode, flocculation effects are good, the usage amount of the flocculant can be substantially reduced, and aluminiferous concentration of effluent is low, so that the biological compound flocculant is a water treatment agent with good performances and can be used for treating domestic sewage, industrial sewage and the like.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a novel flocculant. Specifically, it relates to a method for preparing a biological compound flocculant by compounding a microbial flocculant and a chitosan-modified polymer flocculant and its application. Background technique [0002] Flocculants are widely used in water supply, industrial wastewater, urban sewage and sludge dehydration, post-treatment of fermentation industry, food industry and other fields. Flocculants mainly include inorganic flocculants, synthetic organic polymer flocculants and natural organic polymer flocculants. [0003] (1) Inorganic flocculants are mainly iron, aluminum salts and their hydrolysis polymerization products. Inorganic low molecular flocculants (such as aluminum sulfate) are gradually being replaced by inorganic polymer flocculants due to many problems in water treatment. Inorganic polymer flocculants (such as polyaluminum chloride) have better...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/52C08F251/00C08F220/56C08F226/02
Inventor 胡勇有于琪雷志斌
Owner SOUTH CHINA UNIV OF TECH
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