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Preparation method for composite crosslinked adsorbent for waste water treatment

A technology for wastewater treatment and compound crossover, which is applied in the field of adsorption to achieve the effects of simple production process, abundant raw material sources, and easy-to-master process.

Active Publication Date: 2011-01-05
DALIAN DAYU WATER TREATMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a new type of immobilized carrier, polyvinyl alcohol (PVA) has the advantages of high strength, good chemical stability, strong anti-microbial decomposition performance, non-toxic to microorganisms and human body, and low price. Immobilization materials. At present, polyvinyl alcohol is mainly used to immobilize microorganisms or enzymes. It is rare to use polyvinyl alcohol as an adsorbent carrier in the water treatment industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Activated sludge extracellular polymer is a high-molecular compound that is secreted by microorganisms in sludge flocs in the metabolic process and surrounds the microbial cell wall. It is mainly composed of polysaccharides, proteins, nucleic acids and humic acids, and has strong adsorption capacity. .

[0026] Select non-sludge expansion, normal activated sludge or excess sludge to extract extracellular polymer by thermal extraction; the extraction method is: put concentrated activated sludge (sludge concentration 6000mg / L) into autoclave In a pot, steam for 20 minutes at 80°C and one atmosphere pressure, then add an equal volume of distilled water, centrifuge at 8000 rpm for 15 minutes, and take the supernatant to be the extracted extracellular polymer solution. The main active components are polysaccharides and protein. The extracted extracellular polymer solution was concentrated under reduced pressure at 75°C to 1 / 40 of its original volume. At this time, the polysacc...

Embodiment 2

[0028] The citric acid fermentation waste liquid contains a large amount of organic matter such as Aspergillus niger, protein, chitin, polysaccharide, etc. These organic matter contains a large amount of biological macromolecular substances with adsorption activity. The citric acid fermentation waste liquid is passed through an 80-mesh sieve to remove impurities, and then the obtained bacterial cell is centrifuged at a high speed to obtain a bacterial cell complex with a water content of 80%.

[0029] Take 50g of polyvinyl alcohol (PVA) and mix with 500ml of distilled water, stir and dissolve at 80℃ for 6h, the dissolved PVA is a white viscous substance; then 60g of the above-mentioned citric acid fermented bacterial complex is mixed with the polyvinyl alcohol solution After mixing, stir evenly, crush the calcium carbonate and pass through a 500-mesh sieve. Weigh 5g of calcium carbonate powder and add it to the mixed system of polyvinyl alcohol and bacterial complex, and then add ...

Embodiment 3

[0031] Chitosan is a natural biological macromolecular substance extracted from shrimp shells and crab shells. Its molecular chain contains a large number of hydroxyl and amino groups, which has a good adsorption function.

[0032] Select industrially extracted chitosan particles and add them to a 1.2% acetic acid aqueous solution, stir to fully dissolve them, and prepare an acetic acid aqueous solution of chitosan with a concentration of 5 g / L. Mix 70g of polyvinyl alcohol (PVA) with 1000ml of distilled water, stir and dissolve at 85°C for 10 hours, the dissolved PVA is a white viscous substance; take the powdered kaolin, pass through an 800-mesh sieve, weigh 8g for use, and put the PVA solution Mix with 5g / L chitosan solution at a ratio of 6:1 (volume ratio) and mix well, then add 12g of the prepared kaolin powder and stir evenly; then add the above mixture to the 50% boric acid solution , Carry out immobilization and crosslinking at a low temperature of 5℃, stirring speed of 3...

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PUM

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Abstract

The invention discloses a preparation method for a composite crosslinked absorbent for waste water treatment, which comprises: firstly, preparing solution of biological macromolecular material; secondly, heating to dissolve polyvinyl alcohol (PVA), and uniformly mixing the solution of PVA, the solution of biological macromolecular material and mineral powder; thirdly, adding the mixed solution into solution of boric acid to perform immobilized crosslinking, and after crosslinking is finished, washing and drying an immobilized material to obtain the composite crosslinked adsorbent. The method has the advantages of simple and quick process, low cost, economy, applicability and the like. The crosslinked absorbent contains rich active groups and porous structures and has high stability, good absorbing effect and wide application range. The crosslinked absorbent can be widely used for treating waste water.

Description

Technical field [0001] The absorbent belongs to the technical field of adsorption, and specifically relates to a preparation method of a composite cross-linked adsorbent for wastewater treatment. Background technique [0002] With the rapid development of modern industry and urbanization, water pollution has become more and more serious, especially in some industries such as traditional electroplating, tanning, metal surface treatment, printing and dyeing, petrochemical and other organic pollutants containing wastewater discharge. The traditional treatment methods for wastewater discharged from these industries mainly include chemical precipitation, electrolysis, ion exchange, membrane treatment, etc. However, these methods have complex processes, cumbersome operations, high operating costs, and secondary pollution during treatment. defect. Adsorption treatment technology is a simple and effective technology for the treatment of wastewater, which is widely used in the treatment ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28
Inventor 刘俊新阮晓东
Owner DALIAN DAYU WATER TREATMENT TECH
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