Enhancement of biogas production via green ZnO nanoparticles: experimental results of selected herbaceous crops

Hassaan, Mohamed A.; Pantaleo, Antonio; Tedone, Luigi; Elkatory, Marwa R.; Ali, Rehab M.; Nemr, Ahmed El; Mastro, Giuseppe De

doi:10.1080/00986445.2019.1705797

Cited by 36 publications

(22 citation statements)

References 40 publications

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“…All experiments were implemented with 1 g TS of barley straw (dry weight) and 20 g of inoculum (wet weight) with a concentration of 8.40% TS, followed by mixing for 20 min for homogenization. The inoculum/substrate ratio was set based on the previous works [18,21]. The mechanically pretreated barley straw was dried, milled, and separated to attain a particle size of 0.4 mm using Fritsch, Pulverisette 2, and Filtra vibracion S.L.…”

Section: Biogas Experimentsmentioning

confidence: 99%

“…Laboratory tests were implemented in equivalent cylindrical syringes digesters [28][29][30][31]. The syringes are reversed straight forward into the lid of the reactor [21,31]. The gas was sampled with a plastic syringe, which was fitted with a 3-way valve and reinjected into the waste.…”

Section: Biogas Experimentsmentioning

confidence: 99%

“…The 10 mL of A. plumula extract was mixed with 90 mL of 0.1 M of zinc acetate dihydrate solution drop-wise under continuous agitation at ambient temperature for 4-5 h. After that, 50 mL of 2.0 M NaOH solution was added drop-wise into the above mixture, and the stirring was allowed for 2 h. The resulting white precipitate was filtered and washed repeatedly with distilled water and ethanol to remove the impurities. Finally, the white powder obtained was dried at 60 • C in an oven for 24 h [21,32]. Then, the dried powder was calcinated at 550 • C for 2 h to obtain a pure pale white powder of ZnO NPs (Figure 2), which was carefully collected and used for further investigation.…”

Section: Synthesis Of Zno Nanoparticles (Zno Nps)mentioning

confidence: 99%

“…Then, the dried powder was calcinated at 550 • C for 2 h to obtain a pure pale white powder of ZnO NPs (Figure 2), which was carefully collected and used for further investigation. For the chemical synthesis, the same procedures were followed without adding an aqueous extract of the plant [18,21,33].…”

Section: Synthesis Of Zno Nanoparticles (Zno Nps)mentioning

confidence: 99%

“…Additionally, the lowering of ZnO NPs dosage (less than 6 mg/g TS) has little or no impact on methane production. Hassaan et al [21] verified that NPs might enhance the AD process and stimulate the slurry digestion, which improves the biogas generation, but it depends on a certain dosage. The improvement of the biogas production from durum wheat is attained by adding lower concentrations of 5 and 10 µg/mL of ZnO NPs, while the addition of a higher concentration of 20 µg/mL of ZnO NPs has an inhibitory effect.…”

Section: Introductionmentioning

confidence: 99%

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Techno-Economic Analysis of ZnO Nanoparticles Pretreatments for Biogas Production from Barley Straw

et al. 2020

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The aim of this study was to analyze the effect of ZnO nanoparticles (ZnO NPs) on the biogas production from mechanically treated barley straw and to perform a techno-economic analysis based on the costs assessment and on the results of biogas production. The structural changes of mechanically pretreated barley straw were observed using FTIR, XRD, TGA, and SEM. Additionally, both green ZnO NPs prepared from red alga (Antithamnion plumula) extract and chemically prepared ZnO NPs were characterized by FTIR, XRD, SEM, and TEM, surface area, and EDX. The results revealed that the biogas production was slightly improved by 14.9 and 13.2% when the barley straw of 0.4 mm was mechanically pretreated with 10 mg/L of both green and chemical ZnO NPs and produced 390.5 mL biogas/g VS and 385 mL biogas/g VS, respectively. On the other hand, the higher concentrations of ZnO NPs equal to 20 mg/L had an inhibitory effect on biogas production and decreased the biogas yield to 173 mL biogas/g VS, which was less than the half of previous values. It was also clear that the mechanically treated barley straw of 0.4 mm size presented a higher biogas yield of about 340 mL/g VS, in comparison to 279 mL biogas/g VS of untreated biomass. The kinetic study showed that the first order, modified Gompertz and logistic function models had the best fit with the experimental data. The results showed that the nanoparticles (NPs) of the mechanically treated barely straw are a suitable source of biomass for biogas production, and its yields are higher than the untreated barley straw. The results of the cost-benefit analysis showed that the average levelized cost of energy (LCOE), adopting the best treatments (0.4 mm + 10 mg/L ZnO), is 0.21 €/kWh, which is not competitive with the other renewable energy systems in the Egyptian energy market.

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Section: Biogas Experimentsmentioning

confidence: 99%