Method for preparing compound flocculating agent

A flocculant and composite technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the difficulty of large-scale industrial production and use of microbial flocculants, reduce the total amount of flocculants, the residual amount of metal ions, flocculant molecules Problems such as different structures, to achieve the effect of weakening secondary pollution, good promotion value, and good flocculation effect

Active Publication Date: 2011-04-20
江苏中鹏环保集团有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 1. The development status and existing problems of flocculation technology: flocculation technology is widely used in water supply, wastewater flocculation purification, fermentation industry, solid-liquid separation, etc. The flocculation effect depends on the type of flocculant selected
[0003] 2. Difficulties in the production and development of microbial flocculants: First, the acquisition of flocculant-producing bacteria: the currently used flocculant microorganisms belong to bacteria, actinomycetes, bacilli and yeasts, etc. The flocculant bacteria are different, and the flocculant produced The molecular structure is also different
Therefore, although microbial flocculants are green water treatment agents, safe and non-toxic, they do not have economic advantages, making it difficult to produce and use microbial flocculants on a large scale
At present, there is no report on the use of EM bacteria and inorganic flocculants to produce composite flocculants
[0005] 4. The research status of composite flocculants: Most of the research on microbial flocculants is aimed at a single strain, which has the disadvantages of difficult strain screening and high cultivation costs, and the most important defect is the lack of applicability
EM bacteria is also a compound microbial preparation. The compound use of EM and inorganic flocculants PAC and PFS can significantly reduce the total dosage of flocculants and the residual amount of metal ions in the treated water. Regarding the application of EM bacteria in this aspect, There is no relevant research report in China

Method used

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  • Method for preparing compound flocculating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Preparation of biological flocculant solution: mix EM, honey, and sterile water in a volume ratio of 5:5:90, and ferment for 3 days at 25°C with a rotary shaker speed of 120r / min to obtain EM Fermentation liquid: Centrifuge the fermentation liquid at a speed of 8000r / min for 20 minutes, evaporate and concentrate the separated liquid to 1 / 4 of the original volume at 40°C-50°C, cool to 4°C, add 2 times the volume of anhydrous cold ethanol , placed at 4°C for 24 hours, poured out the liquid, and retained the flocculation sedimentation substrate; then added ethanol with an equal volume of 80% mass concentration to the separated liquid part, left it for 24 hours, poured out the liquid part, and retained the flocculation sediment Precipitate, repeat this step twice to collect the flocculated precipitate; then dilute the precipitate with ethanol and dry it under vacuum for 6-8 hours under the condition of 10-12pa to obtain the solid bio-flocculant; dissolve the bio-floccula...

Embodiment 2

[0028]The difference between this implementation and Example 1 is: EM, honey, and sterile water are mixed according to the volume ratio of 5:5:90 and then fermented in a sealed container for 3 days. The other steps and parameters are the same as in Example 1. Composite flocculants are also available.

Embodiment 3

[0030] (1) Preparation of biological flocculant solution: mix EM, honey, and sterile water evenly according to the volume ratio of 5:5:90, and ferment for 3 days at 25°C with a rotary shaker speed of 120r / min; use 5000r Centrifuge the fermented liquid at a speed of 1 / min for 20 minutes, evaporate and concentrate the separated liquid to 1 / 4 of the original volume at 40°C to 50°C, cool it down to 4°C, add 2 times the volume of anhydrous cold ethanol, and cool it at 4°C Put it under the ground for 24 hours, pour out the liquid, keep the flocculation sedimentation substrate; then add ethanol with an equal volume mass concentration of 80% to the separated liquid part, let it stand for 24 hours, pour out the liquid part, keep the flocculation sedimentation, repeat the process Step 2 times, collect the flocculated precipitate; then dilute the precipitate with ethanol, and dry it under vacuum for 6-8 hours under the condition of 10-12pa to obtain the solid bio-flocculant; dissolve the ...

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Abstract

The invention relates to a method for preparing a compound flocculating agent, which comprises the following steps of preparing a biological flocculating agent solution; compounding the biological flocculating agent solution and an inorganic flocculating agent solution; dissolving PAC, PFS or the mixture of the PAC and the PFS in deionized water to obtain the inorganic flocculating agent solution, and mixing the biological flocculating agent solution and the inorganic flocculating agent solution according to the volume ratio of 3:10-15; and obtaining the compound flocculating agent. The compound flocculating agent prepared by the method can achieve high flocculating rate and small adding amount and reduce the amount of metal ions remained in the water body, thereby overcoming the defects of the inorganic flocculating agent solution used in water treatment.

Description

technical field [0001] The invention belongs to the technical field of flocculants, and in particular relates to a preparation method for compounding a microbial flocculant and an inorganic flocculant to produce a composite flocculant. Background technique [0002] 1. The development status and existing problems of flocculation technology: flocculation technology is widely used in water supply, wastewater flocculation purification, fermentation industry, solid-liquid separation, etc. The flocculation effect depends on the type of flocculant selected. At present, there are two main types of flocculants used in the water treatment industry: inorganic flocculants represented by aluminum-based, iron-based and their polymers, and organic polymer flocculants represented by PAM and their derivatives. They are widely used due to their good flocculation effect and low cost during use, but their unsafety to the environment has attracted enough attention. Aluminum ions in aluminum-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56
Inventor 邵孝侯罗德芳金秋徐姗姗
Owner 江苏中鹏环保集团有限公司
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