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Active carbon composite hydrophili polyurethane foamed microorganism fixed carrier

A technology for immobilization of hydrophilic polyurethane and microorganisms, which is applied in the fields of immobilization on/in organic carriers, biological water/sewage treatment, chemical instruments and methods, etc., and can solve problems such as poor adsorption capacity, small specific surface area, and high cost. problems, to achieve the effect of increasing the super adsorption force, increasing the contact area, and increasing the contact area

Inactive Publication Date: 2004-03-03
大连兰大生物环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pollutant removal ability of immobilized microorganisms is affected by the type of carrier and its preparation method. U.S. Patent 4983299 reports that polyurethane and activated carbon are used as immobilized biological carriers; Chinese patent CN1105649A adds activated carbon to the polyurethane preparation process and foams Finally, as immobilized microbial carriers, the disadvantages of the two are small specific surface area, poor adsorption capacity, and insufficient hydrophilicity, impact resistance and stability of the carrier.
There are many polymer gel carriers reported in the literature, one is natural polymer gel carriers, such as agar, carrageenan, calcium alginate, etc. These carriers are generally non-toxic to organisms and have excellent affinity for microorganisms , mass transfer performance is also better, but its biological stability is poor, mechanical strength is low, and cost is high; Polyacrylic acid gel, etc. Although this type of carrier has good strength, its bioaffinity and mass transfer performance are poor, and it will affect the activity of microorganisms when they are embedded
At the same time, due to the poor impact resistance and mass transfer of the polymer gel carrier, its application is limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Take 59.5 parts of polyether, 0.32 parts of water, 0.45 parts of silicone oil, 0.14 parts of reagent amine, 0.14 parts of catalyst, and 1.1 parts of activated carbon according to the mass, and put them into the stirring tank in turn. Add 5.35 parts of MLZ polymer water-absorbing agent in the state to make it evenly dispersed, then add 30 parts of toluene isocyanate and 3 parts of polyisocyanate, continue stirring evenly, put it in a mold for foaming, and cut it into 20mm×15mm×15mm Cube foam vector.

[0018] in a total volume of 0.35M 3 In the plastic aeration tank, add 20-30% of the reaction volume of the foam carrier, add the activated sludge supernatant or high-efficiency microbial flora, and then pass the industrial wastewater adjusted to pH=7-8 in advance to soak it in the tank Carrier, under the condition of stuffy exposure, the immobilization reaction is carried out by the synergistic effect of strong adsorption and valence bond combination. From the ...

Embodiment 2

[0019] Example 2. Take 54.43 parts of polyether, 0.85 parts of water, 1.1 parts of silicone oil, 0.17 parts of reagent amine, 0.17 parts of catalyst, and 2.75 parts of activated carbon according to the mass, and put them in a stirring tank in turn. Add 11 parts of MLZ polymer water-absorbing agent in the state to make it evenly dispersed, then add 27 parts of toluene isocyanate and 2.53 parts of polyisocyanate, continue stirring evenly, place it in a mold for foaming, and cut it into 20mm×15mm×15mm Cube foam vector.

[0020] After domestication and health preservation as in Example 1, add COD to be 548mg / L, NH 4 ＝ - Domestic sewage with N of 28mg / L, SS of 255mg / L and pH=7-8, start the aeration device to carry out contact oxidation reaction, the sewage has been biochemically treated for 4-6 hours, and the effluent index COD is 62mg / L, NH 4 ＝ -N is 8mg / L, SS is 65mg / L, reaching the national first-level emission standard.

Embodiment 3

[0021] Example 3. Take 56 parts of polyether, 0.60 parts of water, 0.8 parts of silicone oil, 0.16 parts of reagent amine, 0.16 parts of catalyst, and 1.9 parts of activated carbon according to the mass, and put them in a stirring tank in turn. Add 9.58 parts of MLZ polymer water-absorbing agent in the state to make it evenly dispersed, then add 28 parts of toluene isocyanate and 2.8 parts of polyisocyanate, continue stirring evenly, put it in a mold for foaming, and cut it into 20mm×15mm×15mm Cube foam vector.

[0022] In a circular plastic tank with a volume of 0.1M3, an outlet weir is set on the upper end and a gas collection device is installed on the top to form an anaerobic bioreactor; the other two tanks are open at the top, also have an upper outlet weir and have the same volume as 0.1M3 A circular plastic tank constitutes an aerobic bioreactor. Filter screens are set up and down inside the reactor for carrying activated carbon composite hydrophilic polyurethane foam ...

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PUM

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Abstract

A hydrophilic composite immobilized microbe carrier is preapred from foam polyurethane, polyisocyanate, MLZ-type high-molecular water absorbent and activated carbon. Its advantages are large specific surface area, macropore permeability, high hydrophilicity, reactivity and adsorbability, excellent affinity to microbe, and high stability.

Description

technical field [0001] The invention relates to a polyurethane foam microorganism immobilization carrier, in particular to an active carbon composite hydrophilic polyurethane foam microorganism immobilization carrier used for sewage treatment and general biological reaction process. Background technique [0002] In the early 1980s, in the face of increasingly serious water pollution problems, immobilized microbial technology began to be used in sewage treatment. Immobilized microorganism technology is beneficial to the screening, domestication and immobilization of dominant bacteria while immobilizing microorganisms. It can constitute an efficient wastewater treatment system and be used for sewage treatment. Compared with general sewage biological treatment methods, it has high treatment efficiency. , good stability, able to purify and maintain dominant flora, large microbial load, small sludge output, easy solid-liquid separation, and less land occupation for infrastructure...

Claims

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Application Information

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IPC IPC(8): C02F3/32C08G18/02C12N11/08
Inventor 李彦锋周林成马鹏程叶正芳王凯庆
Owner 大连兰大生物环境技术有限公司
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