Short-cut denitrification coupled anaerobic ammonia oxidation composite particle as well as preparation method and application thereof

Abstract

The invention discloses a short-cut denitrification coupled anaerobic ammonia oxidation composite particle as well as a preparation method and application thereof. The composite particle comprises a core layer, a first shell layer and a second shell layer which are sequentially arranged from inside to outside, wherein the core layer is zeolite, the first shell layer is a biological membrane containing anaerobic ammonia oxidizing bacteria, and the second shell layer is a hydrogel layer containing short-cut denitrifying bacteria. According to the composite particles provided by the invention, zeolite is used as a carrier, and short-cut denitrifying bacteria and anaerobic ammonia oxidizing bacteria are co-immobilized and cultured, so that the loss of the anaerobic ammonia oxidizing bacteria in a wastewater treatment process is effectively reduced; the adsorption performance of zeolite on ammonia nitrogen in water is combined with the microbial action, the biological efficiency of short-cut denitrifying bacteria and anaerobic ammonia oxidizing bacteria is improved, nitrate in the wastewater is reduced into nitrite in combination with the short-cut denitrifying bacteria, and coordinatedoperation of short-cut denitrification reaction and anaerobic ammonia oxidizing reaction is realized. In addition, the preparation method of the composite particle is simple, and the preparation process is easy to control.

Description

technical field [0001] The invention relates to the technical field of sewage biological denitrification treatment, and more specifically relates to a composite particle of short-range denitrification coupled with anaerobic ammonium oxidation and its preparation method and application. Background technique [0002] At present, due to the accelerated process of industrialization and urbanization in our country, the problem of excessive nitrogen in water has aroused people's great attention. In aquatic ecosystems, the removal of total nitrogen mostly depends on the traditional nitrification-denitrification denitrification technology. The traditional denitrification technology requires aeration and the addition of additional organic matter to meet the needs of denitrification, resulting in high operating costs and energy consumption. It consumes a lot. [0003] The anaerobic ammonium oxidation process is currently known as a relatively cost-effective nitrogen removal method, a...

AI Technical Summary

Problems solved by technology

The denitrification process can be adjusted through the influent water quality and operating parameters, and the accumulation of NO2--N can be stably realized as the electron acceptor of the anammox reaction, but the anaerobic Ammonia oxidizing bacteria grow slowly and have a long generation cycle. They need to survive in a high concentration of ammonia nitrogen environment, and their activity is easily affected by dissolved oxygen, temperature and pH. The N2 produced during the reaction process is easy to pollute Mud suspension, resulting in poor sludge settling performance, resulting in sludge loss

[0005] Therefore, it is necessary to solve the problems that the anammox bacteria in the anammox process are easy to lose and have low activity in a low-concentration ammonia-nitrogen environment

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