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.

移动床生物反应器 (MBBR) 用于处理市政和工业废水，是一种完全混合的附着生长型系统，涉及微生物在反应器内的悬浮载体表面上作为生物膜生长。如果生物膜足够厚，反应器中的溶解氧就不会扩散到更深的地层，因此这些区域会出现缺氧/厌氧条件，促进异养反硝化细菌的生长。自养硝化菌像往常一样在生物载体中的生物膜外表面定植。因此，好氧硝化和缺氧反硝化微生物的发展促进了同一生物膜不同区域内的硝化和反硝化同时进行。本文总结了 MBBR 系统中通过自养硝化和异养反硝化去除氮的可行性，包括其他生物膜单元中同时硝化和反硝化 (SND) 过程的各个方面。除此之外，还简要介绍了之前进行的研究中需要进一步调查的领域。