Preparation and application of denitrifying bacteria immobilized fixed-type bioactive fillers with textile fabrics and polyvinyl alcohol non-woven fabrics as carriers

Abstract

The invention discloses preparation and an application of denitrifying bacteria immobilized fixed-type bioactive fillers with textile fabrics and polyvinyl alcohol non-woven fabrics as carriers, and belongs to the technical field of water treatment. Each fixed-type bioactive filler is composed of the carrier and an embedding body; the carrier is prepared by overlaying multiple layers of polyvinyl alcohol non-woven fabrics and one layer of textile fabric; an embedding liquid is formed by mixing a polyvinyl alcohol solution and a denitrifying bacteria concentrated solution, and the embedding body is formed by boric acid cross-linking curing of the embedding liquid; the carrier is soaked in the embedding liquid, through boric acid secondary cross-linking, the non-woven fabrics and the embedding body are firmly bound together, the embedding body penetrates through textile fabric meshes to form a riveting fixing structure, and the good tensile property of the textile fabric improves the overall stability of the filler. The prepared bioactive fillers are fixed on the prefabricated frame. The prepared denitrifying bacteria immobilized fixed-type bioactive fillers are good in overall stability and good in process performance, can establish and maintain flora advantages of the denitrifying bacteria in a short period of time, and maintain an efficient denitrification ability of a system.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to the preparation and application of a denitrifying bacteria-immobilized immobilized bioactive filler with textiles and polyvinyl alcohol non-woven fabrics as carriers. Background technique [0002] With the increasing attention and great attention to the nitrogen pollution of water bodies at home and abroad, the effluent standards of sewage treatment plants are becoming more and more stringent. Sewage treatment plants in my country generally require strict implementation of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) Class A A standard. However, the denitrification effect of the existing technology is difficult to meet the requirements of raising the total nitrogen (TN), and the existing technology must be upgraded. [0003] Water body denitrification technology includes physical chemical method and biological method. Although the physical an...

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Problems solved by technology

[0005] According to the actual operation of most sewage treatment plants in China, the following problems often exist in the denitrification process of the activated sludge system: it is difficult for denitrifying bacteria to form a strong bacterial group advantage under the current process conditions, the reactor startup time is long, and the denitrification Low efficiency; compared with the biofilm method, the system has poor shock load resistance; a large number of denitrifying bacteria are at high concentrations, and the sludge in the sedimentation tank is prone to float up in large clumps, which has a great impact on the effluent water quality, etc.

This method is simple to operate, but has great limitations. The embedding body itself lacks the structural advantages of water treatment fillers, and the actual application effect is not ideal.

However, the bioactive fillers prepared by combining traditional fillers such as Raschig rings, Pall rings, and stepped rings with embeddings through adhesion have problems such as poor overall stability, easy detachment of embeddings, and easy loss of bacteria.

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