Rapid enrichment of denitrifying methanotrophs in a series hollow-fiber membrane biofilm reactor

Denitrifying anaerobic methane oxidation (DAMO) process uses methane as electron donor to reduce nitrate/nitrite to dinitrogen, which is a potentially efficient, low-cost and clean biological nitrogen removal technology. However, slow microbial growth rate severely limits the application of this pro...

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Bibliographic Details
Published in:The Science of the total environment 2022-08, Vol.834, p.155375-155375, Article 155375
Main Authors: Wang, Jiaqi, He, Mingyue, Li, Yufen, Ma, Fang, Zheng, Ping, Hu, Baolan
Format: Article
Language:English
Subjects:
Denitrifying methanotrophs
Dissolved oxygen
Rapid enrichment
Series hollow-fiber membrane biofilm reactor
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Summary:Denitrifying anaerobic methane oxidation (DAMO) process uses methane as electron donor to reduce nitrate/nitrite to dinitrogen, which is a potentially efficient, low-cost and clean biological nitrogen removal technology. However, slow microbial growth rate severely limits the application of this promising process. In this study, a series hollow-fiber membrane biofilm reactor (HfMBR) was operated for 90 days to achieve rapid enrichment of these denitrifying methanotrophs. Finally, the highest relative abundance of denitrifying methanotrophic archaea and bacteria (DAMO archaea and bacteria) reached 47.5% and 11.3%, respectively. And the average abundance of DAMO archaea and bacteria increased 92.9 and 136.6 times respectively during the 90-day enrichment. High growth rate of DAMO archaea with a doubling time of 11.6 days was achieved in the second HfMBR according to quantitative PCR results. The results implied that dissolved oxygen would inhibit the growth of DAMO archaea, but the series HfMBR could effectively counteract this unfavorable factor. This work provided theoretical guidance for the rapid enrichment of denitrifying methanotrophs and contributed to the application of methane-dependent denitrification process. [Display omitted] •Rapid enrichment of denitrifying methanotrophs was achieved in a series HfMBR.•The average abundance of DAMO archaea increased 92.9 times in 90 days.•The average abundance of DAMO bacteria increased 136.6 times in 90 days.•Series HfMBR is an effective solution to adverse effects of dissolved oxygen.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2022.155375