Civil Engineering Department, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711 103, India.
Bioprocess Biosyst Eng. 2021 Apr;44(4):635-652. doi: 10.1007/s00449-020-02475-6. Epub 2021 Jan 2.
Moving bed bioreactor (MBBR), used for treatment of municipal and industrial wastewater, is a completely mixed attached growth type system that involves microorganisms which grow as biofilm on the surface of the suspended carriers within the reactor. If the biofilm is thick enough, dissolved oxygen in the reactor would not diffuse into deeper strata and thus anoxic/anaerobic condition develops in those regions facilitating growth of heterotrophic denitrifying bacteria. Autotrophic nitrifiers colonize the outer surface of biofilm in biocarriers as usual. Thus, development of aerobic nitrifying and anoxic denitrifying microorganisms facilitates nitrification and denitrification simultaneously within different zones of the same biofilm. The present paper summarizes the feasibility of nitrogen removal in MBBR systems via autotrophic nitrification followed by heterotrophic denitrification, including various aspects of simultaneous nitrification and denitrification (SND) process in other biofilm units as well. Apart from that, the areas for further investigation are briefly narrated from studies conducted earlier.
移动床生物膜反应器（MBBR）用于处理城市和工业废水，是一种完全混合的附着生长型系统，其中涉及在反应器内悬浮载体表面上生长为生物膜的微生物。如果生物膜足够厚，那么反应器中的溶解氧就不会扩散到更深的地层，从而在这些区域形成缺氧/厌氧条件，有利于异养反硝化细菌的生长。自养硝化菌通常会在生物载体的生物膜外表面定殖。因此，好氧硝化和缺氧反硝化微生物在同一生物膜的不同区域内同时生长，促进了硝化和反硝化作用。本文总结了通过自养硝化随后异养反硝化在 MBBR 系统中去除氮的可行性，包括其他生物膜单元中同时硝化反硝化（SND）过程的各个方面。除此之外，还从早期的研究中简要叙述了进一步研究的领域。
