Preparation method of denitrification embedding immobilized granule

A particle and denitrification technology, applied in chemical instruments and methods, fixed on/in organic carriers, water/sludge/sewage treatment, etc. Problems such as mechanical nozzle clogging can be achieved to shorten the domestication time, reduce the difficulty of mechanized production, and increase the concentration of microorganisms

Inactive Publication Date: 2018-07-27
NANJING UNIV OF SCI & TECH +1
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Problems solved by technology

The above research shows that when the embedding and immobilization method is used to treat ammonia nitrogen wastewater, it often takes a long time to acclimatize directly to embedding activated sludge; while the methods of enriching nitrifying sludge or screening strains are usually only suitable for small batch production in laboratories , it is difficult to mass-produce in batches on the basis of the existing technology; in addition, because the activated sludge contains sticky substances such as bacteria micelles, it is not easy to mix evenly with the PVA-SA hydrogel solution, which is easy to cause in mechanized production clogging of mechanical nozzles
These factors limit the industrial application of embedding and immobilization technology in the treatment of ammonia nitrogen wastewater

Method used

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  • Preparation method of denitrification embedding immobilized granule
  • Preparation method of denitrification embedding immobilized granule
  • Preparation method of denitrification embedding immobilized granule

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preparation example Construction

[0013] A preparation method for denitrification embedding and immobilization particles, the specific implementation steps are: under the condition of a water bath at about 98°C, mix polyvinyl alcohol with a mass percentage of 2% to 20% with water and dissolve it into a colloid, and simultaneously add 0.1%~5% sodium alginate, 0.1%~5% SiO 2 , stir evenly with a glass rod until completely dissolved to obtain PVA-SA hydrogel, cool to 15-35°C and mix evenly with microbial nitrifying bacteria agent at a mass ratio of 0.001:1-0.1:1, and finally drop the mixture into the Saturated boric acid is reacted with a cross-linking agent configured with aluminum sulfate, fixed at 1-10°C for 18-48 hours, washed with water, and dried at 35°C. The embedding particles are spherical, with a particle size of 3-5cm. They are resistant to compression, tough, not easy to break, and have a long service life.

[0014] Among them, the degree of polymerization of polyvinyl alcohol is 1750±50, SiO 2 The m...

Embodiment 1

[0019] In a water bath at 100°C, mix 6g of polyvinyl alcohol (PVA) with 100g of water to dissolve into a colloid, and add 0.5g of sodium alginate (SA) and 0.5g of SiO 2 , stirred evenly with a glass rod until completely dissolved to prepare PVA-SA hydrogel, cooled to 30°C and mixed evenly with 0.5g microbial nitrifying bacteria agent, and finally dripped the mixture into a saturated boric acid solution containing aluminum sulfate with a syringe, Fix at low temperature for 24 hours, wash with water, dry at 35°C, soak in tap water and store at 4°C.

Embodiment 2

[0021] In a water bath at 100°C, mix 6g of polyvinyl alcohol (PVA) with 100g of water to dissolve into a colloid, and add 0.5g of sodium alginate (SA) and 0.5g of SiO 2 , stirred evenly with a glass rod until completely dissolved to prepare PVA-SA hydrogel, cooled to 30°C and mixed evenly with 2g of microbial nitrifying bacteria agent, and finally dripped the mixture into a saturated boric acid solution containing aluminum sulfate with a syringe, at low temperature Fix it under the sun for 24 hours, wash it with water, dry it at 35°C, soak it in tap water and store it at 4°C.

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Abstract

The invention discloses a preparation method of a denitrification embedding immobilized granule. The preparation method includes the steps of: a) dissolving polyvinyl alcohol in water at high temperature and successively adding alginic acid and SiO2 to fully dissolve the raw materials to obtain a PVA-SA hydrogel solution, and cooling the solution; b) mixing a nitrobacteria microbial agent with thePVA-SA and the hydrogel solution, and fully stirring the components to uniformly mix the microorganisms and the hydrogel; c) dropwise adding the mixture to a crosslinking agent prepared from boric acid and aluminum sulfate, immobilizing the components, and washing the product with clear water and drying the product. In the invention, with the powdery nitrobacteria microbial agent as a target microbial agent, the denitrification embedding immobilized granule is produced. Compared with a method of enriching nitrobacteria, difficulty of mechanical manufacturing is greatly reduced; the method promotes the development of industrial wastewater treatment of embedding immobilization.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for preparing denitrification immobilized particles. Background technique [0002] Microbe embedding and immobilization technology is an emerging technology in the field of modern bioengineering, which refers to a means of embedding free microorganisms in translucent polymers or membranes by physical or chemical methods. Since it was used in the water treatment industry in the 1970s, due to its good microbial interception effect, it has high activity, strong specificity, strong tolerance, stable treatment effect, and no toxic and harmful substances in specific treatment systems. The removal rate is fast, the solid-liquid separation is simple, no sludge is produced, and the sewage equipment is miniaturized. It has become a popular research object in the water treatment industry. It is suitable for specific types of wastewater treatment (such as organic wastewater, heav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N11/10C12N11/08C12N11/04C02F3/34C02F101/16
CPCC02F3/34C02F2101/16C12N11/04C12N11/08C12N11/10
Inventor 安立超邵勇赵茂杰戴昕刘军宫建瑞
Owner NANJING UNIV OF SCI & TECH
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