Journal
BIORESOURCE TECHNOLOGY
Volume 181, Issue -, Pages 312-320Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.01.101
Keywords
Anoxic phase; High-throughput sequencing; Paracoccus aminophilus; Corynebacterium sp.; Heterotrophic nitrification
Funding
- Polish National Science Center [N N523 423337, N N523 739440]
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This study investigated how the microbial composition of biomass and kinetics of nitrogen conversions in aerobic granular reactors treating high-ammonium supernatant depended on nitrogen load and the number of anoxic phases in the cycle. Excellent ammonium removal and predomination of full nitrification was observed in the reactors operated at 1.1 kg TKN m (3) d (1) and with anoxic phases in the cycle. In all reactors, Proteobacteria and Actinobacteria predominated, comprising between 90.14% and 98.59% of OTUs. Extracellular polymeric substances-producing bacteria, such as Rhodocyclales, Xanthomonadaceae, Sphingomonadales and Rhizobiales, were identified in biomass from all reactors, though in different proportions. Under constant aeration, bacteria capable of autotrophic nitrification were found in granules, whereas under variable aeration heterotrophic nitrifiers such as Pseudomonas sp. and Paracoccus sp. were identified. Constant aeration promoted more even bacteria distribution among taxa; with 1 anoxic phase, Paracoccus aminophilus predominated (62.73% of OTUs); with 2 phases, Corynebacterium sp. predominated (65.10% of OTUs). (C) 2015 Elsevier Ltd. All rights reserved.
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