Immobilized carrier of nano-attapulgite clay compounded hydrophilic urethane foam microorganisms

A nano-attapulgite and microbial immobilization technology, which is applied in the direction of immobilized enzymes, biochemical equipment and methods, sustainable biological treatment, etc., can solve the problems of high cost and limited application of nanomaterials, and achieve perfect pore structure and increase The effect of mechanical properties and simple manufacturing process

Inactive Publication Date: 2010-01-06
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost of nanomateria

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 A nano-attapulgite composite hydrophilic polyurethane foam microorganism immobilization carrier is composed of the following raw materials in parts by weight:

[0025] Polyether 100 Toluene Diisocyanate 50 Polyisocyanate 3.1

[0026] Nano attapulgite 4 silicone oil 0.45 tertiary amine 0.25

[0027] Organotin 0.14 Water 2.0 Dichloromethane (MC) 4.5

[0028] N, N Dimethylformamide (DMF) 40

[0029] Its preparation method comprises the following steps:

[0030] (1) The purified attapulgite raw soil produced by Jiangsu Xuyi Guangming Attapulgite Factory is crushed into particles with a particle size of less than 100 μm by an ordinary ball mill. Take 4 parts of pulverized attapulgite powder, mix it with 2.0 parts of water, and stir it into a stable attapulgite suspension in a BILON-1500 ultrasonic disperser produced by Xi'an Depai Biotechnology Co., Ltd. liquid. Take 1 part of commercially available (such as Nanjing Lipai Chemical Co., Ltd. or Gaizhou Chemi...

Embodiment 2

[0034] Embodiment 2 A nano-attapulgite composite hydrophilic polyurethane foam microorganism immobilization carrier is composed of the following raw materials in parts by weight:

[0035] Polyether 100 Toluene Diisocyanate 45 Polyisocyanate 3.9

[0036] Nano attapulgite 5 Silicone oil 1.2 Tertiary amine 0.20

[0037] Organotin 0.20 Water 2.5 MC2.3 DMF60

[0038] Its preparation method and test method are with embodiment 1.

[0039] After testing, the average COD of influent water is 648mg / l, NH 3-Domestic sewage with an average N of 68mg / l, an average of SS of 225mg / l, and a pH of 7-8. After 5 hours of biochemical treatment, the effluent index COD3 -N<5mg / l, SS<10mg / l, which meet the requirements of Class I A standard in GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants".

Embodiment 3

[0040] Embodiment 3 A nano-attapulgite composite hydrophilic polyurethane foam microorganism immobilization carrier is composed of the following raw materials in parts by weight:

[0041] Polyether 100 Toluene Diisocyanate 38 Polyisocyanate 3.1

[0042] Nano attapulgite 2 silicone oil 0.85 tertiary amine 0.14 organotin 0.15

[0043] Water 1.0 MC1.6 DMF30

[0044] Its preparation method is with embodiment 1.

[0045] In a sequencing batch activated sludge reactor (sequencing batch reactor referred to as SBR reactor, produced by Lanzhou Jiaotong University) with a total volume of 5L, add 40% of the reaction volume foam carrier, and add the pre-acclimated active sludge at a concentration of 8g / L. Sludge is passed into domestic sewage to soak the carrier in the reactor, and the process of microbial immobilization and film formation is carried out under the condition of stuffy exposure. From the second day onwards, 30% of the waste water in the tank was replaced every day. After...

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Abstract

The invention relates to an immobilized carrier of nano-attapulgite clay compounded hydrophilic urethane foam microorganisms, which consists of the following raw materials in parts by weight: 100 polyether, 36-55 toluene di-isocyanate, 3.1-3.9 polyisocyanate, 0.5-5 nano-attapulgite clay, 0.45-1.2 silicon oil, 0.14-0.25 tertiary amine, 0.14-0.20 organotin, 1.0-2.7 water, 1.6-4.5 methylene dichloride and 0-80 N, N-dimethylformamide. The polyisocyanate and the nano-attapulgite clay are added in the foaming process of common polyether urethane, thereby the common polyether urethane has a water absorbing surface with crosslinked network structure and strong polarity, meanwhile has great adsorption capacity and hydrophilicity of nanomaterials, improves the compatibility and the mass transfer performance of a foam carrier to the microorganism, and simultaneously strengthens the physicochemical performance and the stability of the materials, thereby improving the sewage treatment efficiency.

Description

technical field [0001] The invention relates to a polyurethane foam microorganism immobilization carrier, in particular to a nano attapulgite composite hydrophilic polyester foam microorganism immobilization carrier used in the sewage treatment process. Background technique [0002] However, with the increasingly serious problem of water pollution, it is urgent to develop new technologies for efficient wastewater treatment. [0003] The traditional sewage biochemical treatment process uses microbial immobilization technology to immobilize the selectively screened dominant bacteria, thus forming an efficient wastewater treatment system. Compared with the ordinary activated sludge method, this technology has many advantages, which are mainly reflected in: (1) After the high-efficiency microorganisms are immobilized, the treatment efficiency and hydraulic resistance of the reactor are improved, and the impact capacity of the organic load is enhanced, and the sludge The yield i...

Claims

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Application Information

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IPC IPC(8): C12N11/00C08G18/76C08G18/48C08K3/34C02F3/34C02F3/10
CPCY02W10/10
Inventor 张媛李杰石宗利
Owner LANZHOU JIAOTONG UNIV
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