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The Impact of Alkali Pretreatment and Organic Solvent Pretreatment on Biogas Production from Anaerobic Digestion of Food Waste

Shitophyta Lukhi Mulia, Padya Syaeful Akbar, Zufar Ahmad Fatwa, Rahmawati Novia

Journal of Ecological Engineering

2022

Vol. 23, nr 12

179--188

Anaerobic digestion of food waste is an encouraging technology for biogas production. Pretreatment of the substrate is needed to increase biodegradation. This study aimed to investigate the effect of alkali pretreatment and organic solvent pretreatment on biogas production. Physical pretreatment was also applied in this study. NaOH (0%, 2%, 4% and 6%) was used as alkali pretreatment. Ethanol (0, 2, 4 and 6%) was used as organic solvent pretreatment. The experiment was conducted in a 1 L batch digester under room temperature. Results showed that 0% NaOH generated the highest cumulative biogas yield of 46.1 mL/gVS. The best biodegradability of 37.5% was achieved in NaOH of 0%. The lower concentration of ethanol generated a higher biogas yield. The greatest cumulative yield of 41.5 mL/gVS was obtained at an ethanol concentration of 0% with a biodegradability of 33.84%. Statistical analysis proved that alkali pretreatment and organic solvent pretreatment had no significant effect on biogas production (p>0.05). Physical pretreatment had a significant effect (p<0.05) with the highest cumulative yield of 58.2 mL/gVS. The kinetic model proved that the modified Gompertz was a suitable model for predicting and simulating the kinetics of anaerobic digestion from food waste (R2 > 0.9).

Effect of Alkali-NaOH Pretreatment on Methane Production from Anaerobic Digestion of Date Palm Waste

Lahboubi Nabila, Karouach Fadoua, Bakraoui Mohammed, El Gnaoui Yasser, Essamri Azzouz, El Bari Hassan

Ecological Engineering & Environmental Technology

2022

Vol. 23, iss. 2

78--89

Anaerobic digestion of the date palm empty fruit bunch is a promising technology for both solid waste management and biogas production. The date palm empty fruit bunch is a lignocellulosic waste that takes more time for degradation and has a low biodegradability, thus pretreatment is needed to improve anaerobic biodegradation. In this study, the substrate was pretreated with different ratios of alkali-NaOH: 6, 18 and 30% (w/w) (ratio weight of NaOH / weight of Volatile Solid) for 10 min at room temperature to evaluate the effect of high alkali concentration on the methane potential and biodegradability. The experiment was conducted in a 5 L batch reactor under mesophilic conditions (37 °C). The methane potential of the untreated substrate was 98.5 N mL/gVS. The best methane potential improvement of 104% was achieved in the treatment of 18% (w/w) (204 N mL/gVS) with a biodegradability of 50%. Besides, two kinetic models were used to fit the experimental methane potentials and to explore process parameters (Modified Gompertz and Transference function). The best fit for predicting the parameters of methane production was observed for the 18% (w/w) pretreatment using the transference function, with a maximum methane production rate of 5 N mL/gVS.d.

Produktywność biogazowa prosa rózgowatego przy wykorzystaniu metody ługowania substratów

Adamski M, Pronobis Ł., Dworecki Z.

Autobusy : technika, eksploatacja, systemy transportowe

2012

R. 13, nr 10

94-97

Proso rózgowate jest szeroko propagowaną rośliną energetyczną wykorzystywaną pierwotnie w procesie spalania biomasy. W artykule omówiono wpływ wstępnego przetwarzania prosa rózgowatego zasadą sodową na produktywność biogazową i dynamikę produkcji. Celem przeprowadzonych badań było określenie wzrostu produktywności biogazowej przy obniżonym poziomie stężenia ługu w szczepionej próbce. Badania wykazały poprawę dynamiki procesu (produktywność chwilowa) oraz zauważalny wzrost produkcji biogazu (o 11%).

The switchgrass is a widely propagated energy plant used originally in the process of consuming biomass. In the article an influence of the pretreatment of the millet was discussed switchgrass with alkali (NaOH) to the biogas productivity and production dynamics. Determining the increase in the biogas productivity by the lowered level of the concentration of alkali was an aim of conducted examinations. Examinations showed the improvement in dynamics of the process (momentary productivity) and noticeable rise in the total biogas production (by the 11%).