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PVA/chitosan spherical biological carrier and preparation method thereof

A technology of biological carrier and chitosan, applied in the field of environmental engineering, can solve the problems that biological carriers are difficult to store, easy to stick to each other, and high water-soluble swelling, achieve moderate density and size, prevent reactor clogging failure, and biocompatibility good effect

Active Publication Date: 2017-12-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used cross-linking agents are D, L-glyceraldehyde, glutaraldehyde, genipin, boric acid and other solutions. Although the above chemical cross-linking agents can effectively cross-link polymers, they are more toxic to microorganisms. Its application in the field of biological sciences is limited, and the spherical biocarrier after boric acid crosslinking has high water-soluble swelling and is prone to adhesion to each other, making the biocarrier difficult to store

Method used

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  • PVA/chitosan spherical biological carrier and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment example 1PV

[0020] The preparation of implementation case 1PVA / chitosan spherical biological carrier

[0021] 1) Prepare raw material solution: Dissolve 12g of PVA in 120mL 2.5% acetic acid solution with an electronic balance, stir mechanically for 8 hours until completely dissolved; weigh 4g chitosan and dissolve in 120mL 2.5% acetic acid solution, stir magnetically for 4 hours until completely dissolved; The above two solutions were mixed and mechanically stirred for 2 h to form a homogeneous sol for later use.

[0022] 2) Prepare cross-linking agent solution: add 5g NaOH and 20mL absolute ethanol per 100mL solution, and stir evenly.

[0023] 3) Preparation of spherical biocarriers: use a peristaltic pump and a syringe to evenly drop the prepared homogeneous sol into the crosslinking agent solution, and keep stirring. The flow rate of the peristaltic pump is 2-5mL / min, and the inner diameter of the dripper is 1mm. During the preparation process, the cross-linking agent solution needs ...

Embodiment example 2

[0025] Implementation Case 2: Preparation of PVA / Chitosan / Zerovalent Iron Spherical Biocarrier

[0026] 1) Prepare raw material solution: Dissolve 12g of PVA in 120mL 2.5% acetic acid solution with an electronic balance, stir mechanically for 8 hours until completely dissolved; weigh 4g chitosan and dissolve in 120mL 2.5% acetic acid solution, stir magnetically for 4 hours until completely dissolved; After the above two solutions were mixed, 1 g of zero-valent iron powder was added and mechanically stirred for 2 hours to form a homogeneous sol for later use.

[0027] 2) Prepare cross-linking agent solution: add 5g NaOH and 20mL absolute ethanol per 100mL solution, and stir evenly.

[0028] 3) Preparation of spherical biocarriers: use a peristaltic pump and a syringe to evenly drop the prepared homogeneous sol into the crosslinking agent solution, and keep stirring. The flow rate of the peristaltic pump is 2-5mL / min, and the inner diameter of the dripper is 1mm. During the pr...

Embodiment example 3

[0030] Implementation case 3: Performance evaluation of PVA / chitosan spherical biocarrier and PVA / chitosan / zero-valent iron spherical biocarrier as aerobic biocarrier for water treatment

[0031] 1) Get two 2000ml beakers and add the PVA / chitosan spherical biological carrier prepared by 0.3L implementation case 1 and the PVA / chitosan / zero-valent iron spherical biological carrier prepared by implementation case 2 respectively, and inoculate 1L aerobic flocculent sewage Mud (taken from Xi'an Beishiqiao Sewage Treatment Plant), add 1L tap water, 2g glucose, 0.2g ammonium chloride, 0.03g potassium hydrogen phosphate, 2mL microelement nutrient solution required for microbial growth, adjust the pH to 6.8-7.2, Aerated culture, replenish water every 3 days.

[0032] 2) After 15 days of culture, the PVA / chitosan spherical biocarrier turned from white to black, and the PVA / chitosan / zero-valent spherical biocarrier turned from off-white to black after 3 days of culture. The results of m...

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Abstract

The invention discloses a PVA / chitosan spherical biological carrier and a preparation method thereof. According to the PVA / chitosan spherical biological carrier, PVA and chitosan are taken as the raw materials, non-toxic NaOH and ethanol are taken as crosslinking agents, and molecules of PVA and chitosan are bonded by covalent bonds through chemical crosslinking to form a three-dimensional structure, so as to obtain the PVA / chitosan spherical biological carrier; and the PVA / chitosan spherical biological carrier is doped with zero-valent iron, so as to obtain PVA / chitosan / zero-valent iron spherical biological carrier. By utilizing NaOH, the covalent bonds between the molecules of PVA and chitosan are reinforced, the material does not swell in water; by doping zero-valent iron, the strength and sluicing resistance of the material are improved. The material is non-toxic, porous, moderate in density and size, good in biocompatibility, capable of accelerating sludge granulation culture, effectively increasing sludge activity and maintaining excellent mass transfer performance and can be used as the biological carrier for culturing granule sludge in an organic wastewater biological treatment reactor. The preparation method is simple, mild in reaction conditions and convenient for industrial production.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and specifically relates to a PVA / chitosan spherical biological carrier and a preparation method thereof, and a PVA / chitosan / zero-valent iron spherical biological carrier and a preparation method thereof. Background technique [0002] The biological carrier is conducive to the cultivation of high-quality granular sludge, which can promote the rapid start-up and high-load stable operation of organic wastewater biological treatment reactors. [0003] Polyvinyl alcohol (PVA) gel particles are a new type of organic polymer microbial carrier, which has the advantages of high mechanical strength, chemical stability, anti-microbial decomposition, non-toxic, and low price. The preparation methods of PVA biological carrier include physical cross-linking method and chemical cross-linking method. Freeze-thaw cycles are often used for physical cross-linking, which refers to the process of using intr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F101/30
CPCC02F3/00C02F2003/001C02F2101/30
Inventor 梁继东王金兴刘永红杨树成高厦
Owner XI AN JIAOTONG UNIV
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