Abstract
Effects of nano-copper (II) oxide (nano-CuO) and nano-magnesium oxide (nano-MgO) particles on activated sludge endogenous respiration (aerobic digestion), biochemical oxygen demand (BOD) biodegradation, and nitrification were investigated through respiration rate measurement. for comparison, the effects of Cu (II) and Mg (II) ions on activated sludge were also studied. Results indicated that soluble Cu (II) has half maximum inhibitory concentration (IC50) values of 19, 5.5, 53, and 117 mg Cu/L for endogenous respiration, BOD biodegradation, ammonium oxidation, and nitrite oxidation, respectively. However, nano-CuO only inhibited BOD biodegradation at 240 mg Cu/L or more, and its associated toxicity was primarily caused by soluble Cu (II). in contrast, soluble Mg (II) was not toxic to activated sludge in the experimental concentration range, but nano-MgO inhibited BOD biodegradation and nitrification with IC50 values of 70 and 143 mg Mg/L, respectively. Further study indicated that the toxicity of nano-MgO resulted primarily from increased pH following MgO hydrolysis.
Recommended Citation
G. Liu and J. Wang, "Effects of Nano-copper(II) Oxide and Nano- Magnesium Oxide Particles on Activated Sludge," Water Environment Research, vol. 84, no. 7, pp. 569 - 576, Wiley, Jan 2012.
The definitive version is available at https://doi.org/10.2175/106143012X13373575830593
Department(s)
Civil, Architectural and Environmental Engineering
Publication Status
Full Access
Keywords and Phrases
Activated sludge; Dissolution; Nano-CuO; Nano-MgO; Toxicity
International Standard Serial Number (ISSN)
1554-7531; 1061-4303
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Wiley, All rights reserved.
Publication Date
01 Jan 2012
