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

A technology of nitrifying bacteria and biological activity, applied in the field of water treatment, can solve the problems of affecting mass transfer, unable to adsorb, high concentration, etc., and achieve the effect of facilitating mass transfer and saving raw materials

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

Its disadvantages are: after the spherical polyurethane carrier with a diameter of 0.5-1.0 cm is adsorbed and immobilized alone, a dense film will be formed on the surface of the polyurethane, which affects mass transfer and low processing efficiency
In addition, studies have shown that when the diameter of the polyurethane carrier is greater than 0.5cm, the mass transfer insid...

Method used

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

Examples

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Effect test

Embodiment 1

[0022] 1. Treatment of nitrifying bacteria

[0023] Using the residual sludge in the secondary sedimentation tank of the urban sewage plant as the bacterial source, the nitrifying bacteria suspension after screening and enrichment culture was centrifuged and concentrated to obtain 3.5×10 9 A / mL concentration of nitrifying bacteria.

[0024] 2. Acquisition of nitrifying bacteria embedding solution

[0025] 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.

[0026] 3. Combination of embedding solution and polyurethane carrier

[0027] Pour the embedding solution into the polyurethane foam (1m*1m*9mm), and squeeze the polyuretha...

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Abstract

The invention discloses preparation and an application of a nitrifying 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 can provide a quite good and relatively stable living environment for microorganisms, and is beneficial for attachment and reproduction of the microorganisms. An embedding liquid is prepared by mixing a nitrifying 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 squeezing and other ways, 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 nitrifying bacteria bioactive filler is obtained. The prepared nitrifying bacteria immobilized bioactive filler not only solves the problems that nitrifying 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 relates to the field of water treatment, in particular to the preparation and application of a polyurethane carrier-based nitrifying bacteria immobilized bioactive 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 biofilm method. In the traditio...

Claims

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Application Information

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IPC IPC(8): C02F3/10C02F3/34
CPCY02W10/10
Inventor 杨宏王玉洁吴城锋管清坤尚海源陈伟鄢琳王小乐王猛孟婷陶慕翔胡希佳赵月兰姚仁达
Owner BEIJING UNIV OF TECH
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