Anaerobic ammonia oxidizing bacteria sandwich-type multilayer immobilized bioactive filler, and preparation and application thereof

Abstract

The invention discloses an anaerobic ammonia oxidizing 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; 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; an embedding liquid formed by mixing an anaerobic ammonia oxidizing bacteria suspension and a polyvinyl alcohol solution evenly coats the non-woven carriers, multiple layers of carriers are overlaid together, after boric acid secondary cross-linking immobilization, the embedding liquid is cured to form the embedding bodies, then a layered filler having a sandwich-like structure is prepared, and then the granular bioactive filler is prepared through cutting the layered filler. A sandwich-like layered structure formed by the non-woven fabrics and the embedding bodies improves the stability of the bioactive filler, the problem of poor stability of a filler prepared by a conventional anaerobic ammonia oxidizing bacteria immobilization method is solved, the concentration of anaerobic ammonia oxidizing bacteria on the filler is high, the treatment efficiency is high, and the bioactive filler has a good application prospect.

Description

technical field [0001] The invention relates to the preparation and application of anaerobic ammox bacteria sandwich-type multi-layer immobilized bioactive filler in water treatment, belonging to the field of water treatment. Background technique [0002] Anaerobic ammonium oxidation technology (ANAMMOX) is currently known as the most economical biological denitrification pathway. Studies by Strous et al. at Delft University in the Netherlands have shown that the biological reaction process including cell synthesis in the anaerobic ammonium oxidation process can be expressed as the formula ( 1) [0003] NH 4 + +1.32NO 2 - +0.066HCO 3 - +0.13H + →1.02N 2 +0.26NO 3 - +0.066CH 2 o 0.5 N 0.5 +2.03H 2 O(1) [0004] From the biological reaction characteristics of anammox bacteria, it can be seen that compared with traditional nitrification and denitrification technology, ANAMMOX has the advantages of low operating cost, low oxygen demand and no need for additional c...

AI Technical Summary

Problems solved by technology

This method is simple to operate, but has great limitations. The prepared biological filler is prone to water-soluble swelling. During use, the mechanical strength of the filler will be greatly weakened due to water-soluble swelling, and even breakage will occur, thus shortening the service life of the filler. , cannot be ideally applied to engineering practice

Experimental studies have shown that the bioactive fillers prepared by combining traditional carriers such as Raschig rings, Pall rings, stepped rings, and suspended modified fillers with embedding bodies through adhesion have poor overall stability and poor embedding. The body is easy to fall off, the bacteria are easy to lose, etc.

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