Abstract
Two types of magnetic nanoparticles (MNPs), i.e. Ni ferrite nanoparticles (Fe 2 NiO 4 ) and Ni Zn ferrite nanoparticles (Fe 4 NiO 4 Zn) containing the trace metals Ni and Fe, were added to the anaerobic digestion of synthetic municipal wastewater at concentrations between 1 and 100 mg Ni L −1 in order to compare their effects on biogas (methane) production and sludge activity. Using the production of methane over time as a measure, the assays revealed that anaerobic digestion was stimulated by the addition of 100 mg Ni L −1 in Fe 2 NiO 4 NPs, while it was inhibited by the addition of 1–100 mg Ni L −1 in Fe 4 NiO 4 Zn NPs. Especially at 100 mg Ni L −1 , Fe 4 NiO 4 Zn NPs resulted in a total inhibition of anaerobic digestion. The metabolic activity of the anaerobic sludge was tested using the resazurin reduction assay, and the assay clearly revealed the negative effect of Fe 4 NiO 4 Zn NPs and the positive effect of Fe 2 NiO 4 NPs. Re-feeding fresh synthetic medium reactivated the NPs added to the anaerobic sludge, except for the experiment with 100 mg Ni L −1 addition of Fe 4 NiO 4 Zn NPs. The findings in this present study indicate a possible new strategy for NPs design to enhance anaerobic digestion.
Original language | English |
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Pages (from-to) | 276-284 |
Number of pages | 9 |
Journal | Science of the Total Environment |
Volume | 642 |
DOIs | |
Publication status | Published - Nov 15 2018 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2018
ASJC Scopus Subject Areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
Keywords
- Anaerobic digestion
- Ferrite nanoparticles
- Resazurin
- Stimulation
- Toxicity