Anaerobic ammoxidation sludge embedding immobilization method

Abstract

The invention relates to an anaerobic ammoxidation sludge embedding immobilization method belonging to the field of sewage treatment, and particularly provides a method for performing embedding immobilization on anaerobic ammoxidation sludge by adding magnetic powder and powdered activated carbon. The method comprises the following steps: preparing an embedding agent, mixing anaerobic ammoxidation sludge with the embedding agent, preparing immobilized anaerobic ammoxidation balls, activating the immobilized anaerobic ammoxidation balls and the like. The preparation of the embedding agent comprises the following steps: weighing polyvinyl alcohol (PVA), sodium alginate (SA), powdered activated carbon and magnetic powder, and preparing into a solution, wherein on the basis of percentage in mass, the concentration of the PVA is 6-10wt%, the concentration of the SA is 2-3wt%, the concentration of the powdered activated carbon is 1-2wt%, and the concentration of the magnetic powder is 2-4wt%; and uniformly stirring, thus preparing the mixed embedding agent. The method is simple in preparation process, easy to operate and low in preparation cost; and the prepared embedding immobilization anaerobic ammoxidation balls are high in activity, favorable in stability and suitable for industrial production, and can achieve favorable economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for embedding and immobilizing anaerobic ammonium oxidation sludge by adding magnetic powder and powdered activated carbon, belonging to the field of sewage treatment. Background technique [0002] Anaerobic ammonium oxidation (ANAMMOX) is currently known as the most simple and economical way of biological denitrification. The denitrification field has a good application prospect. In this process, anammox bacteria use nitrite as electron acceptor to oxidize ammonia nitrogen into nitrogen gas. Compared with the traditional denitrification system, the anaerobic ammonium oxidation system has the advantages of less oxygen demand, no need to add organic carbon source, and less residual sludge generated. However, studies have shown that anammox sludge is a complex microbial symbiotic system composed of ANAMMOX bacteria, anaerobic bacteria, facultative bacteria and aerobic bacteria, which is only active at high cell concent...

AI Technical Summary

Problems solved by technology

However, due to the following three characteristics of anammox bacteria, it is very difficult to maintain a sufficient amount of anammox sludge in a practical reactor:

[0003] (1) Anammox bacteria are autotrophic microorganisms that grow slowly, with a generation cycle of up to 11 days and a very low growth rate

[0004] (2) The biomass of anammox microorganisms is low, and it takes a long time to start the ammonium oxidation reactor. It usually takes more than 3 months to start an anammox reactor

[0005] (3) A large amount of nitrogen generated in the anaerobic ammonium oxidation reactor makes the sludge suspended in the reactor, which is easy to cause the loss of bacteria

Now commonly used embedding materials are polyvinyl alcohol (PVA), sodium alginate (SA), and polyvinyl alcohol and sodium alginate mixed gel (PVA-SA), but the anaerobic ammox embedding after fixing with these materials Small balls generally have problems such as poor spheroidization, low mechanical strength, poor swelling, easy to break, and low anaerobic ammonia oxidation activity.

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