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Suspension microorganism carrier and its preparation method

A carrier, microporous technology, applied in sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the difficulty of increasing production and labor intensity, difficult to precisely control pore distribution and structure, and manufacture raw materials The problem of high cost, to achieve the effect of low suspension fluidity and manufacturing cost, excellent microbial affinity, and reduced cost of manufacturing raw materials

Inactive Publication Date: 2006-11-29
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of chemical foaming agents such as sodium bicarbonate, it is difficult to precisely control the pore distribution and structure, and the obtained material has a disordered and random pore structure
In addition, starch-based pore-forming agents are often added in the manufacturing process of polyvinyl alcohol sponges or foams. Due to the need for post-cleaning to remove the residues, the difficulty and labor intensity of production are increased, and the manufacturing process needs to be improved.
[0004] Although the polyvinyl alcohol material is hydrophilic and has excellent bio-affinity, it is very suitable for use as a microbial carrier material, but because the current polyvinyl alcohol sponge or foam is limited by its density and pore structure, its manufacturing material raw materials The cost is high, and there is still a distance from the low price and high performance requirements of industrial wastewater treatment fillers, and its application is limited

Method used

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  • Suspension microorganism carrier and its preparation method
  • Suspension microorganism carrier and its preparation method
  • Suspension microorganism carrier and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 100 g of polyvinyl alcohol with a degree of polymerization of 1799 was added to 750 ml of water under stirring, and the temperature was gradually raised to 90° C. until the polyvinyl alcohol was completely dissolved.

[0026] When the temperature of the polyvinyl alcohol solution dropped to 50°C, slowly add 180ml of 40% sulfuric acid, the temperature of the system would rise at this time, and when the temperature dropped to 50°C, add 100ml of formalin for acetalization. After 10 minutes, 15 g of sepiolite powder was added, and the mixture was rapidly stirred to disperse evenly in the solution phase. Then, pour the material mixture into the acid-resistant plastic mold, pass preheated air from the bottom of the mold through the microporous glass gas distributor to increase the volume to 5000ml, stop the ventilation, seal the mold and place it at a temperature of 50°C Process for 6 hours. Finally, open the mold, take out the gray foam, wash off the residual sulfuric acid ...

Embodiment 2

[0029] 100 g of polyvinyl alcohol with a degree of polymerization of 1799 was added to 900 ml of water under stirring, and the temperature was gradually raised to 90° C. until the polyvinyl alcohol was completely dissolved.

[0030] When the temperature of the polyvinyl alcohol solution drops to 30°C, slowly add 160ml of 40% sulfuric acid, and the system temperature will rise at this time. When the temperature drops to 30°C, add 80ml of formaldehyde solution for acetalization. After 15 minutes, 20 g of powdered activated carbon was added and stirred rapidly to make it evenly dispersed in the solution phase. Then, pour the material mixture into an acid-resistant plastic mold, pass preheated air from the bottom of the mold through a microporous glass gas distributor to increase the volume to 7600ml, stop the ventilation, seal the mold and place it at a temperature of 40°C Process 20 hours. Finally, open the mold, take out the formed black foam, wash off the residual sulfuric ac...

Embodiment 3

[0034] According to the same method of embodiment 2, the addition amount of activated carbon is changed to 40g, and other compositions and operation methods remain unchanged. The mass fraction of the obtained foam loaded with activated carbon is 28%, its appearance and pore structure are consistent with those of Example 2, the pore diameter is between 0.5 and 2 mm, and the bulk density is about 18Kg / m 3 .

[0035] SEM photographs of the material are shown in image 3 It can be shown that the pore size of its framework micropores is larger than that of the sample obtained in Example 2, most of which are below 60 μm, and its pores are more developed, with a specific surface area of ​​69 m. 2 / g.

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Abstract

A suspended microbe carrier with high microbial affinity, adsorption and hydrophilicity is a macroreticular skeleton and millipore skeleton combined structure. Its preparing process includes such steps as preparing the aqueous solution of polyvinyl alcohol, proportionally adding sulfuric acid and formaldehyde solution, reaction, adding powdered imorganic filler, high-speed stirring, filling it in a mould, foaming by filling the pre-heated air via millipore air distributor, and treating at 40-80 deg.C for 4-24 hr.

Description

technical field [0001] The invention belongs to the field of environmental engineering materials, and relates to a preparation method of a porous microorganism carrier material. Background technique [0002] The introduction of high-efficiency microbial carrier materials into traditional sewage biochemical treatment equipment (aeration tank) is of great significance for improving wastewater treatment capacity and efficiency and reducing the amount of excess sludge. At present, the materials used in wastewater biochemical treatment are mainly suspended fiber bundles that are fixedly installed, but they are still troublesome to install and replace, and the load of microorganisms is limited. [0003] Because the macroporous polymer carrier has a high space for microbial colonization, its research and development have important application value. CN1216581A discloses a sponge particle microbial carrier of porous polyvinyl formal, the pore diameter of which is 20-300 μm. Due to...

Claims

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Application Information

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IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 张文龙李茂康蒋柏泉刘燕燕
Owner NANCHANG UNIV
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