TY - JOUR
T1 - Impacts of morphological-controlled ZnO nanoarchitectures on aerobic microbial communities during real wastewater treatment in an aerobic-photocatalytic system
AU - Chang, Jang Sen
AU - Chong, Meng Nan
AU - Poh, Phaik Eong
AU - Ocon, Joey D.
AU - Md Zoqratt, Muhammad Zarul Hanifah
AU - Lee, Sze Mei
N1 - Funding Information:
The authors would like to thank Mr. Wilhelm Eng Wei Han and Ms. Lim Shu Yong for their assistance in DNA analysis. Prof. MN Chong is highly indebted to the Royal Society-Newton Advanced Fellowship (Reference No.: NA150418 ) awarded to him. Mr. Chang Jang Sen is also grateful to the MyBrain15 scholarship from the Ministry of Higher Education, Malaysia. Appendix A
Publisher Copyright:
© 2019 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/4
Y1 - 2020/4
N2 - This study aimed to evaluate the impacts of morphological-controlled ZnO nanoarchitectures on aerobic microbial communities during real wastewater treatment in an aerobic-photocatalytic system. Results showed that the antibacterial properties of ZnO nanoarchitectures were significantly more overwhelming than their photocatalytic properties. The inhibition of microbial activities in activated sludge by ZnO nanoarchitectures entailed an adverse effect on wastewater treatment efficiency. Subsequently, the 16S sequencing analysis were conducted to examine the impacts of ZnO nanoarchitectures on aerobic microbial communities, and found the significantly lower microbial diversity and species richness in activated sludge treated with 1D-ZnO nanorods as compared to other ZnO nanoarchitectures. Additionally, 1D-ZnO nanorods reduced the highest proportion of Proteobacteria phylum in activated sludge due to its higher proportion of active polar surfaces that facilitates Zn2+ ions dissolution. Pearson correlation coefficients showed that the experimental data obtained from COD removal efficiency and bacterial log reduction were statistically significant (p-value < 0.05), and presented a positive correlation with the concentration of Zn2+ ions. Finally, a non-parametric analysis of Friedman test and post-hoc analysis confirmed that the concentration of Zn2+ ions being released from ZnO nanoarchitectures is the main contributing factor for both the reduction in COD removal efficiency and bacterial log reduction.
AB - This study aimed to evaluate the impacts of morphological-controlled ZnO nanoarchitectures on aerobic microbial communities during real wastewater treatment in an aerobic-photocatalytic system. Results showed that the antibacterial properties of ZnO nanoarchitectures were significantly more overwhelming than their photocatalytic properties. The inhibition of microbial activities in activated sludge by ZnO nanoarchitectures entailed an adverse effect on wastewater treatment efficiency. Subsequently, the 16S sequencing analysis were conducted to examine the impacts of ZnO nanoarchitectures on aerobic microbial communities, and found the significantly lower microbial diversity and species richness in activated sludge treated with 1D-ZnO nanorods as compared to other ZnO nanoarchitectures. Additionally, 1D-ZnO nanorods reduced the highest proportion of Proteobacteria phylum in activated sludge due to its higher proportion of active polar surfaces that facilitates Zn2+ ions dissolution. Pearson correlation coefficients showed that the experimental data obtained from COD removal efficiency and bacterial log reduction were statistically significant (p-value < 0.05), and presented a positive correlation with the concentration of Zn2+ ions. Finally, a non-parametric analysis of Friedman test and post-hoc analysis confirmed that the concentration of Zn2+ ions being released from ZnO nanoarchitectures is the main contributing factor for both the reduction in COD removal efficiency and bacterial log reduction.
KW - Antibacterial activity
KW - Photocatalytic degradation
KW - Wastewater treatment
KW - Zn ions dissolution
KW - ZnO photocatalyst
UR - http://www.scopus.com/inward/record.url?scp=85077033676&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2019.113867
DO - 10.1016/j.envpol.2019.113867
M3 - Article
C2 - 31896479
AN - SCOPUS:85077033676
SN - 0269-7491
VL - 259
JO - Environmental Pollution
JF - Environmental Pollution
M1 - 113867
ER -