Granular denitrifying bacteria sandwich-type multilayer immobilized bioactive filler, and preparation and application thereof

Abstract

The invention discloses a granular denitrifying bacteria sandwich-type multilayer immobilized bioactive filler, and preparation and an application thereof, and belongs to the technical field of water treatment. The bioactive filler is composed of two parts: embedding bodies and non-woven carriers; an embedding liquid is formed by mixing a polyvinyl alcohol solution and a denitrifying bacteria concentrated solution, and the embedding bodies are formed by boric acid cross-linking curing of the embedding liquid; the non-woven carriers are evenly coated with the embedding liquid, multiple layers of carriers are overlaid together, a layered filler having a sandwich-like structure is formed after boric acid secondary cross-linking immobilization; the embedding bodies and the non-woven carriers are in alternative arrangement; fiber yarns of the non-woven carriers and the embedding bodies are combined into a stable organic whole; the granular bioactive filler is prepared through cutting. The prepared granular denitrifying bacteria sandwich-type multilayer immobilized bioactive filler has good overall stability and good process property, can establish and maintain flora advantages of denitrifying bacteria in a short period of time, and maintains an efficient denitrification ability of a system.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to the preparation and application of a granular denitrifying bacteria sandwich type multi-layer immobilized bioactive filler. 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 and chemical method is simple, it is easy t...

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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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