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Effect of NaCl on aerobic denitrification by strain Achromobacter sp. GAD-3
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Effect of NaCl on aerobic denitrification by strain Achromobacter sp. GAD-3
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Journal Article
Effect of NaCl on aerobic denitrification by strain Achromobacter sp. GAD-3
2017
Overview
This paper presents the effect of NaCl on aerobic denitrification by a novel aerobic denitrifier strain
Achromobacter
sp. GAD-3. Results indicated that the aerobic denitrification process was inhibited by NaCl concentrations ≥20 g L
−1
, leading to lower nitrate removal rates (1.67∼4.0 mg L
−1
h
−1
), higher nitrite accumulation (50.2∼87.4 mg L
−1
), and increasing N
2
O emission ratios (13∼72 mg L
−1
/mg L
−1
). Poor performance of aerobic denitrification at high salinity was attributed to the suppression of active microbial biomass and electron donating capacity of strain GAD-3. Further studies on the corresponding inhibition of the denitrifying gene expression by higher salinities revealed the significant sensitivity order of
nosZ
(for N
2
O reductase) >
cnorB
(for NO reductase) ≈
nirS
(for cytochrome cd(1) nitrite reductase) >
napA
(for periplasmic nitrate reductase), accompanied with a time-lapse expression between
nosZ
and
cnorB
based on reverse transcription and real-time quantitative polymerase chain reaction (RT-qPCR) analysis. The insights into the effect of NaCl on aerobic denitrification are of great significance to upgrade wastewater treatment plants (WWTPs) containing varying levels of salinity.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V
Subject
/ Achromobacter - drug effects
/ Biomass
/ Biomedical and Life Sciences
/ Cadmium
/ Emission
/ Microbial Genetics and Genomics
/ Nitrate Reductase - genetics
/ Nitrate Reductase - metabolism
/ Nitrates
/ nitric oxide reductase (cytochrome c)
/ Nitrite Reductases - metabolism
/ Nitrites
/ Oxidoreductases - metabolism
/ quantitative polymerase chain reaction
/ reverse transcriptase polymerase chain reaction
/ RNA, Ribosomal, 16S - genetics
/ Salinity
