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Abdelsalam, E.; Samer, M.; Attia, Y.A.; Abdel-Hadi, M.A.; Hassan, H.E.; Badr, Y.
Energy conversion and management, 06/2017, Letnik: 141Journal Article
•The addition of trace metals in form of nanoparticles reduced the lag phase.•Nanoparticles reduced time to achieve the highest biogas and methane production.•Biogas and methane production were proportional to nanoparticles concentration.•Nanoparticles biostimulate the methanogenic bacteria and increase their activity. Nanoparticles (NPs) were hypothesized to enhance the anaerobic process and to accelerate the slurry digestion, which increases the biogas and methane production. The effects of NPs on biogas and methane production were investigated using a specially designed batch anaerobic system. For this purpose, a series of 2L biodigesters were manufactured and implemented to study the effects of Cobalt (Co) and Nickel (Ni) nanoparticles with different concentrations on biogas and methane production. The best results of NPs additives were determined based on the statistical analysis (Least Significant Difference using M-Stat) of biogas and methane production, which were 1mg/L Co NPs and 2mg/L Ni NPs (p<0.05). These NPs additives delivered the highest biogas and methane yields in comparison with their other concentrations (0.5, 1, and 2mg/L), their salts (CoCl2, and NiCl2) and the control. Furthermore, the addition of 1mg/L Co NPs and 2mg/L Ni NPs significantly increased the biogas volume (p<0.05) by 1.64 and 1.74 times the biogas volume produced by the control, respectively. Moreover, the aforementioned additives significantly increased the methane volume (p<0.05) by 1.86 and 2.01 times the methane volume produced by the control, respectively. The highest specific biogas and methane production were attained with 2mg/L Ni NPs (p<0.05), and were 614.5mlBiogasg−1VS and 361.6mlCH4g−1VS, respectively compared with the control which yielded only 352.6mlBiogasg−1VS and 179.6mlCH4g−1VS.
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