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Method for extracting and purifying sulfated polysaccharides by using activated sludge from municipal sewage treatment plant as raw material

A technology of activated sludge and sulfated polysaccharides, which is applied in the fields of environmental engineering and chemical engineering, can solve the problems of limited extraction rate, limited suitable breeding area, and high dependence on weather and seawater conditions, and achieves simple extraction methods, good application prospects, and resource utilization. effect

Inactive Publication Date: 2019-01-11
薛蔚琦 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the artificial seaweed cultivation technology has developed rapidly since the end of the 1950s and provided a large amount of raw materials for the production of polysaccharide sulfate, due to the high dependence of seaweed cultivation on weather and seawater conditions, the suitable cultivation area is limited and the cost of seaweed cultivation is high , seaweed collection is completely dependent on manual labor, and the existing extraction methods are limited in terms of extraction rate, the global sulfated polysaccharide market is always in a state of short supply, and the price of sulfated polysaccharide products is also very expensive
In addition, a large amount of aquaculture wastewater produced by artificial seaweed cultivation has also become an environmental problem that cannot be ignored in seaweed cultivation.

Method used

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  • Method for extracting and purifying sulfated polysaccharides by using activated sludge from municipal sewage treatment plant as raw material
  • Method for extracting and purifying sulfated polysaccharides by using activated sludge from municipal sewage treatment plant as raw material
  • Method for extracting and purifying sulfated polysaccharides by using activated sludge from municipal sewage treatment plant as raw material

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Embodiment 1

[0031] The present embodiment provides a method for extracting and purifying sulfated polysaccharides from activated sludge, comprising steps:

[0032] S1: Take 500g of concentrated sludge (water content about 98%) from the secondary sedimentation tank of a municipal sewage treatment plant, then add the same volume of distilled water, shake well and centrifuge, discard the upper liquid phase, repeat the mud washing step 4 times, 4500rpm Retain solid phase mud cake after centrifugation;

[0033] S2: Mix and shake the solid phase mud cake and distilled water, so that the suspended solids concentration (MLSS) of the obtained mixed solution is 5000 mg / L, and the water content is not less than 90%; the mixed solution is heated to 50 ° C, and simultaneously A 10V direct current is passed through the mixture for 15 minutes;

[0034] S3: Centrifuge the product obtained by S2 at 4500 rpm, discard the solid phase mud cake, and collect the upper liquid phase;

[0035] S4: Ultrafiltrati...

Embodiment 2

[0039] The present embodiment provides a method for extracting and purifying sulfated polysaccharides from activated sludge, comprising steps:

[0040]S1: Take 1L of mud-water mixture (activated sludge) in the biological aeration tank of a municipal sewage treatment plant, add the same volume of distilled water, shake well and centrifuge, discard the upper liquid phase, repeat the mud washing step twice, centrifuge at 4500rpm and keep solid phase mud cake;

[0041] S2: Mix and shake the solid phase mud cake and distilled water, so that the suspended solids concentration (MLSS) of the obtained mixed solution is 8000 mg / L, and the water content is not less than 90%; the mixed solution is heated to 30 ° C, and simultaneously A 20V direct current is passed through the mixture for 30 minutes;

[0042] S3: Centrifuge the product obtained by S2 at 4500 rpm, discard the solid phase mud cake, and collect the upper liquid phase;

[0043] S4: Ultrafiltration is performed on the upper l...

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Abstract

The invention relates to a method for extracting and purifying sulfated polysaccharides by using activated sludge from a municipal sewage treatment plant as a raw material. The method comprises the following steps: washing the activated sludge multiple times, performing centrifuging, and collecting the obtained solid phase mud cake; uniformly mixing the solid phase mud cake with water to obtain amixed solution; heating the mixed solution, and applying a direct current; centrifuging a product obtained after the above treatment, and collecting the obtained upper liquid phase; ultrafiltering thecollected upper liquid phase, adding calcium chloride until precipitation is complete, performing centrifuging, and collecting the obtained precipitate; and drying the obtained precipitate, and grinding the dried precipitate into a powder in order to obtain sulfated polysaccharide extract. The method for extracting the sulfated polysaccharides by using the activated sludge produced in the biological treatment process of sewage as the raw material can fully utilize the activated sludge to realize the recycling of the activated sludge and change wastes into valuables; and the extraction methodhas the advantages of simplicity, low cost and excellent application prospect.

Description

technical field [0001] The invention relates to the technical fields of environmental engineering and chemistry and chemical engineering, in particular to a method for extracting and purifying sulfated polysaccharides using activated sludge from municipal sewage treatment plants as raw materials. Background technique [0002] Sulfated polysaccharides are a class of intercellular polysaccharides with a complex structure, a wide variety, and a wide range of applications. Common sulfated polysaccharides include alginic acid, fucoidan, carrageenan, and alginate. Sulfated polysaccharides are currently known to mainly exist in seaweed and a few animal tissues (cow's lung lobe, pig's gastric mucosa, etc.), and also in a very small amount in some halophilic plants and microorganisms. Sulfated polysaccharides have complex chemical structures, diverse chemical properties and biological activities, and are affected by their chemical composition, structure and sulfation degree. The mai...

Claims

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Application Information

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IPC IPC(8): C08B37/00
CPCC08B37/0003
Inventor 曾谦薛蔚琦郝天伟陈光浩
Owner 薛蔚琦
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