Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
680010 | Bioresource Technology | 2015 | 37 Pages |
Abstract
In this study the combination of an upflow anaerobic sludge blanket (UASB) reactor and a deammonification moving bed biofilm reactor (MBBR) for mainstream wastewater treatment was tested. The competition between aerobic ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) was studied during a 5Â months period of transition from reject water to mainstream wastewater followed by a 16Â months period of mainstream wastewater treatment. The decrease of influent ammonium concentration led to a wash-out of suspended biomass which had a major contribution to nitrite production. Influence of a dissolved oxygen concentration and a transient anoxia mechanism of NOB suppression were studied. It was shown that anoxic phase duration has no effect on NOB metabolism recovery and oxygen diffusion rather than affinities of AOB and NOB to oxygen determine the rate of nitrogen conversion in a biofilm system. Anammox activity remained on the level comparable to reject water treatment systems.
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Authors
Andriy Malovanyy, Jingjing Yang, Jozef Trela, Elzbieta Plaza,