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Water purifying agent with defect-rich carbon carriers and immobilized microorganisms and method for preparing water purifying agent

A carbon carrier, defect-rich technology, which is applied in biological water/sewage treatment, granular microbial carrier treatment, chemical instruments and methods, etc. , difficult electrostatic interaction and other problems, to achieve the effect of improving the adsorption and fixation efficiency, overcoming the hydrophobicity problem and improving the adsorption efficiency

Active Publication Date: 2017-12-05
INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coal-based activated carbon used and commercially available carbon materials (activated carbon AC, carbon nanotube CNT, graphite GC, etc.) have many advantages, such as high porosity, large specific surface, good stability, non-toxic and non-polluting-environmentally friendly, etc. ; but its surface has fewer functional groups and does not contain hydrophilic groups (-COOH, -OH), so the dispersion of the purifying agent in water is poor, which hinders full contact with pollutants in sewage, and has hydrogen bonds and Ammonia-nitrogen substances with lone electron pairs are difficult to interact electrostatically and cannot fully exert the adsorption effect of carbon-based carriers on pollutants. Therefore, it is very necessary to control the surface affinity / hydrophobicity of carbon materials.
The current common method is to use concentrated acid (concentrated HNO 3 , concentrated H 2 SO 4 ) to activate the inert carbon surface and oxidize the surface carbon to form oxygen-containing functional groups (-COOH, -OH, -C=O), and at the same time produce polluting nitrogen oxides and sulfur oxides, causing secondary pollution; and using 600 Alkali at a high temperature of around -900°C reacts with carbon in an inert gas environment to etch out secondary pore structures and surface active sites. These methods have harsh reaction conditions and require the reaction vessel to be resistant to acid, alkali and high temperature. In actual operation There are many deficiencies in the application process

Method used

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  • Water purifying agent with defect-rich carbon carriers and immobilized microorganisms and method for preparing water purifying agent
  • Water purifying agent with defect-rich carbon carriers and immobilized microorganisms and method for preparing water purifying agent
  • Water purifying agent with defect-rich carbon carriers and immobilized microorganisms and method for preparing water purifying agent

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preparation example Construction

[0030] A kind of preparation method of the water purifying agent of rich defect carbon carrier immobilized microorganism, concrete steps are:

[0031] 1. Preparation of carbon supports with hydrophilic functional groups and defects on the surface

[0032] 1) Put NaOH+KOH=90g (NaOH:KOH=46.5:43.5, mass ratio) in a 200 ml reactor liner and melt at 165°C for 2 hours to obtain clarified molten lye;

[0033] 2) Using glucose and urea as raw materials, add them to clarified molten lye and react for 12 hours to generate defect-rich powder carbon precursor material A;

[0034] 3) Wash the above-mentioned carbon precursor A with water until the pH value of the washing solution is about 7, remove water-soluble impurities, and then centrifuge to obtain the lower precipitate; the lower precipitate is then washed with absolute ethanol to remove water-insoluble organic impurities, and finally centrifuged The precipitate was dried overnight at 80°C to obtain defect-rich powdery carbon precur...

Embodiment 1

[0039] A kind of preparation method of the water purifying agent of rich defect carbon carrier immobilized microorganism, concrete steps are:

[0040] (1) Preparation of carbon supports with hydrophilic functional groups and defects on the surface

[0041] 1) Put NaOH+KOH=90g (NaOH:KOH=46.5:43.5, mass ratio) in a 200 ml reactor liner and melt at 165°C for 2 hours to obtain clarified molten lye;

[0042] 2) Using glucose and urea as raw materials, add them to clarified molten lye and react for 12 hours to generate defect-rich powder carbon precursor material A;

[0043] 3) Wash the above-mentioned carbon precursor A with water until the pH value of the washing solution is about 7, remove water-soluble impurities, and then centrifuge to obtain the lower precipitate; the lower precipitate is then washed with absolute ethanol to remove water-insoluble organic impurities, and finally centrifuged The precipitate was dried overnight at 80°C to obtain defect-rich powdery carbon precu...

Embodiment 2

[0048] A kind of preparation method of the water purifying agent of rich defect carbon carrier immobilized microorganism, concrete steps are:

[0049] (1) Preparation of carbon supports with hydrophilic functional groups and defects on the surface

[0050] 1) Put NaOH+KOH=90g (NaOH:KOH=46.5:43.5, mass ratio) in a 200 ml reactor liner and melt at 180°C for 2 hours to obtain clarified molten lye;

[0051] 2) Using glucose and urea as raw materials, add them to clarified molten lye and react for 10 hours to generate defect-rich powder carbon precursor material A;

[0052] 3) Wash the above-mentioned carbon precursor A with water until the pH value of the washing solution is about 7, remove water-soluble impurities, and then centrifuge to obtain the lower precipitate; the lower precipitate is then washed with absolute ethanol to remove water-insoluble organic impurities, and finally centrifuged The precipitate was dried overnight at 80°C to obtain defect-rich powdery carbon precu...

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Abstract

The invention belongs to the technical field of water purifying agents with microorganisms, and particularly relates to a water purifying agent with defect-rich carbon carriers and immobilized microorganisms and a method for preparing the water purifying agent. The method includes placing the defect-rich carbon carriers in culture media; inoculating compound bacterial strains to the culture media; carrying out shaking co-culture to obtain the water purifying agent. The water purifying agent and the method have the advantages that the surfaces of the carbon carriers of the water purifying agent contain oxygen-containing functional groups, and accordingly the problem of hydrophobicity of general carbon carriers can be solved; the surfaces of the carbon carriers contain abundant defects and secondary pore structures, accordingly, large quantity of active sites can be provided for adsorption reaction, and the pollutant adsorption efficiency can be improved; co-culture is carried out on the defect-rich carbon carriers with hydrophilic groups and the microorganisms, and accordingly the microorganisms can be advantageously adsorbed and immobilized by the carbon carriers; organic matters and pollutants which are adsorbed on carbon of the carriers can be efficiently utilized and synergistically degraded by the microorganisms, accordingly, the water purifying agent is hydrophilic, but is easy to precipitate and is quite applicable to treating culture anaerobic sewage on a large scale, carbon adsorption and biological degradation double-purification effects can be realized by the water purifying agent, and the like.

Description

technical field [0001] The invention belongs to the technical field of microbial water purifiers, and in particular relates to a water purifier for immobilizing microorganisms on a defect-rich carbon carrier and a preparation method thereof. technical background [0002] In the large-scale development of animal husbandry, unified management has reduced costs and improved economic benefits, but serious environmental pollution caused by a large number of concentrated sewage discharges requires urgent treatment. At home and abroad, there are two main types of aquaculture sewage treatment methods: resource utilization and standard discharge, which can be classified into three types: returning to the field, natural treatment and industrial treatment, each of which has its own advantages and disadvantages. The purpose of my country's aquaculture sewage treatment is to control and reduce the harm caused by it, carry out comprehensive utilization, and finally achieve the goals of re...

Claims

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Application Information

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IPC IPC(8): C02F3/34
CPCC02F3/347C02F2003/003
Inventor 李洁肖艳春陈浩霖黄婧陈彪张燕青陈阳
Owner INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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