Preemptive methodology determining operational parameters for mainstream PN: Evaluating biokinetics of three functional microbiome in seeding sludge

Authors
Yun, WonsangCho, KyungjinJung, JinyoungChoi, Daehee
Issue Date
2023-07
Publisher
Elsevier Limited
Citation
Journal of Water Process Engineering, v.53
Abstract
Chemical oxygen demand (COD)/N ratio is attracted as an alternative strategy selectively suppressing nitrite oxidizing bacteria (NOB) in mainstream partial nitritation (PN). We investigated a methodology that proper COD/N ratio is preemptively evaluated from seeding sludge through biokinetic analysis for three functional aerobic microbes. The COD/N ratio facilitating PN was preemptively determined as >= 3 from the biokinetic assay using seeding sludge, which was successfully verified in continuous bioreactors. Interestingly, the relative bio-kinetic properties of NOB in oxygen competition between aerobic microbes were the key indicators to achieve mainstream PN. Microbial community results show that some aerobic heterotrophic bacteria (AHB) became predominant at higher COD/N ratio conditions (>= 3) with decreasing Nitrospira spp. In other words, the COD/N ratio, which could deteriorate the relative oxygen competition of NOB depending on the microbial community, could be determined preemptively. Our results could suggest that the proposed methodology can be helpful to provide operational guideline of mainstream PN.
Keywords
MUNICIPAL WASTE-WATER; NITRITE-OXIDIZING BACTERIA; NITROGEN REMOVAL; AMMONIUM CONCENTRATION; COMMUNITY DYNAMICS; NOB SUPPRESSION; PERFORMANCE; AERATION; ENRICHMENT; REACTOR; Organic carbon; In-depth biokinetic approach; Relative oxygen affinity; Mainstream nitritation; Microbial community
URI
https://pubs.kist.re.kr/handle/201004/113569
DOI
10.1016/j.jwpe.2023.103650
Appears in Collections:
KIST Article > 2023
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