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Preparation and application of ammonia oxidizing bacteria immobilized bioactive filler based on polyurethane carrier

A technology of ammonia oxidizing bacteria and biological activity, applied in the direction of immobilization on/in organic carriers, sustainable biological treatment, biological water/sewage treatment, etc., can solve the difficulties in making spherical polyurethane, high processing costs, and low processing efficiency and other problems, to achieve the effect of saving raw materials, reducing treatment costs, and high nitrosation efficiency

Inactive Publication Date: 2014-07-30
BEIJING UNIV OF TECH
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Problems solved by technology

Its shortcomings are: after the spherical polyurethane carrier with a diameter of 0.5-1.0 cm is adsorbed and immobilized separately, a dense film will be formed on the surface of the polyurethane, which will affect the mass transfer, the processing efficiency is low, and the production of spherical polyurethane is difficult.
In addition, studies have shown that when the diameter of the polyurethane carrier is greater than 0.5cm, the mass transfer inside the carrier is affected and a dead zone is formed.
The polyvinyl alcohol is 16wt%. This mass fraction is too high for the immobilization of the polyurethane carrier. If the natural adsorption method is used, the polyvinyl alcohol concentration is too high and the viscosity is high, so that the interior of the polyurethane carrier cannot be adsorbed to the polyvinyl alcohol mixture.
In addition, the whole process of nitrification not only consumes a lot of energy, but also has high processing costs.

Method used

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  • Preparation and application of ammonia oxidizing bacteria immobilized bioactive filler based on polyurethane carrier
  • Preparation and application of ammonia oxidizing bacteria immobilized bioactive filler based on polyurethane carrier

Examples

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Embodiment 1

[0025] 1. Treatment of ammonia oxidizing bacteria

[0026] Using the residual sludge in the secondary sedimentation tank of the urban sewage plant as the bacterial source, the ammonia-oxidizing bacteria suspension after screening and enrichment culture was centrifuged and concentrated to obtain 3.5×10 9 Ammonia oxidizing bacteria concentrate per mL.

[0027] 2. Acquisition of embedding solution

[0028] Weigh 200g of polyvinyl alcohol, add 2500ml of ultrapure water and heat to 90°C to dissolve for 15min, take it out and stir evenly, then heat to 90°C and dissolve for 5min, take it out, stir evenly and cool to 30°C, mix 2500ml of polyvinyl alcohol solution with preparation The 2500ml concentrated solution was mixed, and 50g calcium carbonate was added, stirred evenly to make 5000ml embedding solution.

[0029] 3. Combination of embedding solution and polyurethane carrier

[0030] Pour the embedding solution into the entire polyurethane foam material (1m*1m*9mm), and squeeze ...

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Abstract

The invention discloses preparation and an application of an ammonia oxidizing bacteria immobilized bioactive filler based on a polyurethane carrier, and belongs to the technical field of water treatment. The bioactive filler comprises two parts: an embedding body and the polyurethane carrier; a porous structure of the polyurethane foam carrier adsorbs a bacteria-containing embedding liquid, wherein the embedding liquid is prepared by mixing an ammonia oxidizing bacteria concentrated solution and a polyvinyl alcohol solution; a whole sheet of polyurethane foam is used as the embedding carrier, the embedding liquid is immersed to the interior of the polyurethane foam by a squeezing way, the embedding body is formed after boric acid secondary cross-linking and is combined with the polyurethane carrier to obtain a filler shape meeting requirements, and thus the ammonia oxidizing bacteria bioactive filler is obtained. The prepared ammonia oxidizing bacteria immobilized bioactive filler not only solves the problems that ammonia oxidizing bacteria are difficult in advantage establishment, easy to lose and the like, but also improves the processing ability of a reactor, shortens the start-up time, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to the preparation and application of a polyurethane carrier-based ammonia-oxidizing bacteria-immobilized biologically active filler. Background technique [0002] Today, the problem of ammonia nitrogen pollution is becoming more and more serious. Ammonia nitrogen has become a new constraint indicator for emission reduction during the 12th Five-Year Plan. Improving the level of ammonia nitrogen pollution prevention and control has become a necessary measure to improve the quality of water environment. At present, ammonia nitrogen wastewater treatment methods are divided into three categories, physical and chemical methods, biochemical methods and advanced oxidation methods. Due to the mature process and stable performance, the biochemical method is recognized as an economical, effective and most promising method. Biochemical methods include activated sludge method and biofi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10C02F3/34C12N11/08C12N11/04
CPCY02W10/10
Inventor 杨宏尚海源吴城锋管清坤陈伟鄢琳王小乐王猛孟婷陶慕翔胡希佳赵月兰王玉洁姚仁达
Owner BEIJING UNIV OF TECH
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