Paper: Sep 13,2024
q-bio.PE
ID:2409.08739
Effects of pristine and photoaged tire wear particles and their leachable additives on key nitrogen removal processes and nitrous oxide accumulation in estuarine sediments
Global estuaries and coastal regions, acting as critical interfaces for
mitigating nitrogen flux to marine, concurrently contend with contamination
from tire wear particles (TWPs). However, the effects of pristine and photoaged
TWP (P-TWP and A-TWP) and their leachates (P-TWPL and A-TWPL) on key nitrogen
removal processes in estuarine sediments remain unclear. This study explored
the responses of denitrification rate, anammox rate, and nitrous oxide (N2O)
accumulation to P-TWP, A-TWP, P-TWPL, and A-TWPL exposures in estuarine
sediments, and assessed the potential biotoxic substances in TWPL. Results
indicate that P-TWP inhibited the denitrification rate and increased N2O
accumulation without significantly impacting the anammox rate. A-TWP
intensified the denitrification rate inhibition by further reducing narG gene
abundance and NAR activity, and also decreased the hzo gene abundance, HZO
activity, and Candidatus Kuenenia abundance, thereby slowing the anammox rate.
N2O accumulation was lower after A-TWP exposure than P-TWP, with the NIR/NOS
and NOR/NOS activity ratios closely associated with N2O accumulation. Batch
experiments indicated that photoaging promoted Zn release from TWPL,
significantly contributing to the inhibited denitrification rate and increased
N2O accumulation by TWP. In addition, TWP drives changes in microbial community
structure through released additives, with the abundance of DNB and AnAOB
closely linked to the Zn, Mn, and As concentrations in TWPL. This study offers
insights into assessing the environmental risks of TWPs in estuarine
ecosystems.
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Paper Author: Jinyu Ye,Yuan Gao,Huan Gao,Qingqing Zhao,Minjie Zhou,Xiangdong Xue,Meng Shi
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