Comparison of the effects and distribution of zinc oxide nanoparticles and zinc ions in activated sludge reactors
Article
Article Title | Comparison of the effects and distribution of zinc oxide nanoparticles and zinc ions in activated sludge reactors |
---|---|
ERA Journal ID | 36368 |
Article Category | Article |
Authors | Zhang, Dongqing (Author), Trzcinski, Antoine (Author), Oh, Hyun-Suk (Author), Chew, Evelyn (Author), Liu, Yu (Author), Tan, Soon Keat (Author) and Ng, Wun Jern (Author) |
Journal Title | Journal of Environmental Science and Health Part A: Toxic Hazardous Substances and Environmental Engineering |
Journal Citation | 52 (11), pp. 1073-1081 |
Number of Pages | 9 |
Year | 2017 |
Publisher | Taylor & Francis |
Place of Publication | United States |
ISSN | 1093-4529 |
1532-4117 | |
Digital Object Identifier (DOI) | https://doi.org/10.1080/10934529.2017.1338896 |
Abstract | Zinc Oxide nanoparticles (ZnO NPs) are being increasingly applied in the industry, which results inevitably in the release of these materials into the hydrosphere. In this study, simulated waste-activated sludge experiments were conducted to investigate the effects of Zinc Oxide NPs and to compare it with its ionic counterpart (as ZnSO4). It was found that even 1 mg/L of ZnO NPs could have a small impact on COD and ammonia removal. Under 1, 10 and 50 mg/L of ZnO NP exposure, the Chemical Oxygen Demand (COD) removal efficiencies decreased from 79.8% to 78.9%, 72.7% and 65.7%, respectively. The corresponding ammonium (NH4 C N) concentration in the effluent significantly (P < 0.05) increased from 11.9 mg/L (control) to 15.3, 20.9 and 28.5 mg/L, respectively. Under equal Zn concentration, zinc ions were more toxic towards microorganisms compared to ZnO NPs. Under 50 mg/L exposure, the effluent Zn level was 5.69 mg/L, implying that ZnO NPs have a strong affinity for activated sludge. The capacity for adsorption of ZnO NPs onto activated sludge was found to be 2.3, 6.3, and 13.9 mg/g MLSS at influent ZnO NP concentrations of 1.0, 10 and 50 mg/L respectively, which were 1.74-, 2.13- and 2.05-fold more than under Zn ion exposure. |
Keywords | biosorption; waste activated sludge; zinc ions; ZnO nanoparticles |
ANZSRC Field of Research 2020 | 400410. Wastewater treatment processes |
401102. Environmentally sustainable engineering | |
410404. Environmental management | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Nanyang Environment and Water Research Institute, Singapore |
School of Civil Engineering and Surveying | |
Nanyang Technological University, Singapore | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4664/comparison-of-the-effects-and-distribution-of-zinc-oxide-nanoparticles-and-zinc-ions-in-activated-sludge-reactors
Download files
881
total views272
total downloads0
views this month0
downloads this month