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Polyhydroxyalkanoate-diatomite composite material as well as preparation method and application thereof

A technology of polyhydroxyalkanoates and composite materials, applied in chemical instruments and methods, aerobic and anaerobic process treatment, water/sludge/sewage treatment, etc., can solve the complicated preparation method, single sewage treatment effect and high efficiency It can achieve the effect of simple and convenient preparation process, small pores and high efficiency.

Inactive Publication Date: 2020-11-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, CN103898085A discloses a method for preparing diatomite-adsorbed anammox bacterium particles, which mixes powdered diatomite evenly with liquid containing anammox bacteria to form tiny particles, and then Further add water-based polyurethane prepolymer and mix to form a hydrogel, which is cut into cube particles of 3mm to 6mm. During the preparation process, diatomite is mixed with only one kind of bacteria used in sewage treatment. Therefore, it only has this A kind of sewage treatment ability of bacteria, and the preparation process adopts the preparation steps of mixing with bacteria first, then preparing by hydrosol, and finally cutting. The preparation method is cumbersome, and the final composite particles obtained only have sewage of one kind of bacteria Treatment capacity, sewage treatment effect is single, efficiency is poor

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  • Polyhydroxyalkanoate-diatomite composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A polyhydroxyalkanoate-diatomite composite material provided in this embodiment comprises the following components in terms of mass fraction:

[0038] Polyhydroxyalkanoate 0.5%;

[0039] Diatomaceous earth 3.5%;

[0040] Poly-1,4-butylene adipate 5%;

[0041] Diphenylmethane diisocyanate 10%;

[0042] 1,4-Butanediol 1% as chain extender;

[0043] Dicyclohexylcarbodiimide 0.5% as antihydrolysis agent;

[0044] Dimethicone 0.5% as defoamer;

[0045] 2,6-tert-butyl-4-methylphenol as heat stabilizer 0.5%;

[0046] Antioxidant GA-80 0.5%.

[0047] The composite material is in the form of spherical particles with a particle size of 1 mm.

[0048] The preparation method of the polyhydroxyalkanoate-diatomite composite material provided by the present embodiment comprises the following steps:

[0049] S1: Dehydration pretreatment of poly-1,4-butylene adipate with a mass fraction of 5%, and preheating and melting of diphenylmethane diisocyanate with a mass fraction of 10%...

Embodiment 2

[0057] A polyhydroxyalkanoate-diatomite composite material provided in this embodiment comprises the following components in terms of mass fraction:

[0058] Polyhydroxyalkanoate 1.25%;

[0059] Diatomaceous earth 5%;

[0060] Poly(1,4-butylene adipate) 10%;

[0061] Diphenylmethane diisocyanate 12.5%;

[0062] 1,4-Butanediol 1.5% as chain extender;

[0063] Dicyclohexylcarbodiimide 0.75% as an antihydrolysis agent;

[0064] Polydimethylsiloxane 0.75% as defoamer;

[0065] 2,6-tert-butyl-4-methylphenol as heat stabilizer 0.75%;

[0066] Antioxidant GA-80 0.75%.

[0067] The composite material is in the form of spherical particles with a particle size of 1.5mm.

[0068] The preparation method of the polyhydroxyalkanoate-diatomite composite material provided by the present embodiment comprises the following steps:

[0069] S1: Dehydration pretreatment of poly-1,4-butylene adipate with a mass fraction of 10%, preheating and melting diphenylmethane diisocyanate with a mass...

Embodiment 3

[0077] A polyhydroxyalkanoate-diatomite composite material provided in this embodiment comprises the following components in terms of mass fraction:

[0078] Polyhydroxyalkanoate 2%;

[0079] Diatomaceous earth 6.5%;

[0080] Poly(1,4-butylene adipate) 15%;

[0081] Diphenylmethane diisocyanate 15%;

[0082] 1,4-Butanediol 2% as chain extender;

[0083] Dicyclohexylcarbodiimide 1% as antihydrolysis agent;

[0084] Dimethicone 1% as defoamer;

[0085] 2,6-tert-butyl-4-methylphenol as heat stabilizer 1%;

[0086] Antioxidant GA-80 1%.

[0087] The composite material is in the form of spherical particles with a particle size of 2mm.

[0088] The preparation method of the polyhydroxyalkanoate-diatomite composite material provided by the present embodiment comprises the following steps:

[0089] S1: Dehydration pretreatment of poly-1,4-butylene adipate with a mass fraction of 15%, preheating and melting diphenylmethane diisocyanate with a mass fraction of 15% at 50°C;

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Abstract

The invention provides a polyhydroxyalkanoate-diatomite composite material as well as a preparation method and application thereof in sewage treatment. The material comprises the following components:polyhydroxyalkanoate, diatomite, polyester polyol, polyurethane, isocyanate, 1,4-butanediol, an anti-hydrolysis agent, a defoaming agent, a heat stabilizer and an antioxidant. The composite materialprovided by the invention can provide attachment points for various bacteria in sewage sludge, the preparation process is simple and convenient, cutting is not needed, and the composite material can be obtained through air drying after the reaction is completed and has smaller pores, higher porosity and higher sewage treatment efficiency. In addition, the polyhydroxyalkanoate in the composite material can promote the formation of a biological membrane, accelerate the starting process of a reactor and serve as an electron donor to reinforce the biological denitrification performance, and the polyhydroxyalkanoate is compounded with porous substances such as diatomite to further improve the synchronous nitrification and denitrification performance of an aerobic zone, so that efficient sewagedenitrification treatment is realized; therefore, the composite material has great market application prospect and improtant social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a polyhydroxyalkanoate-diatomite composite material, a preparation method and an application. Background technique [0002] Biological fluidized bed is a commonly used sewage treatment bioreactor. The principle is to fill the bed with small inert particles such as activated carbon, coke, zeolite, etc. as the carrier, and the microorganisms inhabit the surface to form a biofilm. The contact area between the biofilm and the pollutants in the sewage is large per unit time, so that the pollutants can be more effectively adsorbed or degraded to achieve sewage purification. The biological fluidized bed process has high efficiency, less land occupation, and low investment. It has been widely used in advanced treatment such as sewage denitrification and secondary treatment of sewage. [0003] In the prior art, CN103898085A discloses a method for preparing d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/302
Inventor 柴晓利戴晓虎陆斌
Owner TONGJI UNIV
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