TY - JOUR
T1 - The effect of Fe 2 NiO 4 and Fe 4 NiO 4 Zn magnetic nanoparticles on anaerobic digestion activity
AU - Chen, Jian Lin
AU - Steele, Terry W.J.
AU - Stuckey, David C.
N1 - Publisher Copyright:
© 2018
PY - 2018/11/15
Y1 - 2018/11/15
N2 - 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.
AB - 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.
KW - Anaerobic digestion
KW - Ferrite nanoparticles
KW - Resazurin
KW - Stimulation
KW - Toxicity
UR - http://www.scopus.com/inward/record.url?scp=85048567738&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2018.05.373
DO - 10.1016/j.scitotenv.2018.05.373
M3 - Article
C2 - 29902625
AN - SCOPUS:85048567738
SN - 0048-9697
VL - 642
SP - 276
EP - 284
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -