A method for efficient treatment of nitrogen-containing wastewater based on dnra-anammox immobilized pellets
An immobilized bead, high-efficiency technology, applied in microorganism-based methods, immobilized enzymes, anaerobic digestion treatment, etc., can solve the problem of excessive gel beads network pores, low gel beads strength and toughness, use Life reduction and other problems, to achieve the effect of improving total nitrogen removal rate, long service life, and enhancing stability
Active Publication Date: 2021-08-10
SHANDONG UNIV
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Problems solved by technology
[0006] At present, it has been reported that polyvinyl alcohol and sodium alginate are used as embedding agents, and an aqueous solution containing calcium chloride and boric acid is used as a cross-linking agent. The embedding agent is solidified by the cross-linking agent to embed and solidify the microorganisms to obtain a porous structure. However, this kind of gel beads has the following problems in practical application: (1) the network pores of the gel beads are too large, and the bacteria are easy to leak out from the network pores of the gel beads, resulting in being trapped Part of the buried bacteria is lost, and the utilization rate is low. (2) The strength and toughness of the gel beads are low, and they are easily softened and deformed by hydraulic shear, and the service life is greatly reduced.
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Embodiment 1
[0046] A method for efficiently treating nitrogen-containing wastewater based on DNRA-Anammox immobilized pellets, comprising the following steps:
[0047] (1) Add polyvinyl alcohol and sodium alginate to water successively and heat, stir, dissolve and mix them uniformly respectively to obtain mixed solution 1. The mass percent of polyvinyl alcohol in mixed solution 1 is 16%, and the mass percent of sodium alginate The content is 1.2%, polyvinyl alcohol is polyvinyl alcohol with a degree of polymerization of 1600-1800 and a degree of alcoholysis > 99%
[0048] (2) Add soluble starch into water to heat and gelatinize, then cool to 70-80°C to obtain mixed solution 2, the mass volume ratio of soluble starch to water is 1:33, unit: g / mL;
[0049] (3) adding the aqueous polyurethane emulsion and the mixed solution 2 with a solid content of 30% into the mixed solution 1 and mixing successively to obtain a gel solution, the mass fraction of the aqueous polyurethane in the gel solutio...
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Abstract
The invention relates to a method for efficiently treating nitrogen-containing wastewater based on DNRA-Anammox immobilized pellets. The DNRA-Anammox immobilized pellets use polyvinyl alcohol, sodium alginate and gelatinized starch cross-linked polymerization products as carriers, including Immobilized pellets formed by burying DNRA bacteria and Anammox bacteria. The immobilized pellets used in the method of the present invention have the advantages of high biomass concentration, strong resistance to environmental toxicity, and reusability, and can make DNRA bacteria and Anammox bacteria in the system. Maintain high bacterial concentration and biological activity, thereby increasing the total nitrogen removal rate of the system. Both DNRA bacteria and Anammox bacteria are anaerobic bacteria, and the DNRA‑Anammox immobilized pellets hinder the mass transfer of dissolved oxygen, making the DNRA bacteria and Anammox bacteria in the DNRA‑Anammox immobilized pellets less susceptible to the influence of dissolved oxygen, enhancing the system stability, realize joint denitrification and improve the total nitrogen removal rate of the system.
Description
technical field [0001] The invention relates to a method for efficiently treating nitrogen-containing wastewater based on DNRA-Anammox immobilized pellets, and belongs to the technical field of sewage treatment. Background technique [0002] With the progress of the times and the continuous improvement of people's living standards, excess nitrogen is artificially discharged into the environment, causing nitrogen pollution. The "China Environmental Status Announcement" released in recent years shows that nitrogen pollution is one of the main causes of water pollution in my country. The denitrification treatment of nitrogen-containing wastewater has always been a research hotspot in sewage treatment, and the biological denitrification method is the most economical and effective method. [0003] The traditional biological denitrification process is built around the nitrification-denitrification pathway, which is complex and difficult to operate, produces a large amount of exce...
Claims
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IPC IPC(8): C12N11/10C12N11/084C02F3/28C02F3/34C12R1/01C02F101/16
CPCC02F3/28C02F3/34C02F2101/16C12N11/08
Inventor 倪寿清李倩霞董颖占金华崔兆杰
Owner SHANDONG UNIV