Particle-size effect of CuO and ZnO on biogas and methane production during anaerobic digestion

Role of biogenic sulfide in attenuating zinc oxide and copper nanoparticle toxicity to acetoclastic methanogenesis

“…In the near future, the production of NPs is expected to increase [2]. Zinc oxide (ZnO-NPs) and copper (Cu 0 -NPs) NPs are used in several consumer products and industrial processes [3].…”

“…These studies concluded that metal cations released by NPs are correlated with the toxic effect [3,6,7]. Biogenic sulfide can attenuate Zn 2+ and Cu 2+ toxicity to methanogens forming non-toxic ZnS and CuS precipitates [8][9][10].…”

Understanding bioenergy production and optimisation at the nanoscale – a review

“…[19] The effects of metal oxide particle size on biogas and methane production during AD of cattle manure was studied by Luna del Risco. [26] In the experiment, nanoparticles of CuO showed higher influence on biogas production than the other test compounds. The concentration of 15 mg/L of CuO nanoparticles resulted in a reduction of 30% of the biogas production from the total biogas produced in the control at day 14.…”

“…However, no significant difference of biogas inhibition from bulk and nanoparticles of ZnO was found. [26] From this section, it can be concluded that particle size and concentration of nano-sized CuO and ZnO affect biogas yield.…”

Leaching of nano-ZnO in municipal solid waste

“…This study showed that the nano-ZnO which remained mostly in solid form did not affect the biological processes in landfill leachate and the dissolved Zn was mainly associated with dissolved organic matter. On the other hand, numerous studies in the literature have reported about the inhibitory/toxic effects of ZnO nanoparticles to aerobic [12][13][14][15] and anaerobic waste/wastewater treatment processes [16][17][18][19][20][21][22], indicating the potential adverse impacts of ZnO nanoparticles on biological systems.…”