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

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...

AI Technical Summary

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 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.

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