Syaichurrozi, Iqbal and Suhirman, Suhirman and Hidayat, Topik (2018) Effect of initial pH on anaerobic co-digestion of Salvinia molesta and rice straw for biogas production and kinetics. Biocatalysis and Agricultural Biotechnology, 16. pp. 594-603. ISSN 1878-8181

	Text Effect of initial pH on anaerobic co-digestion of Salvinia molesta and rice straw for biogas production and kinetics.pdf - Published Version Download (1MB)
	Text Cek Turnitin_Effect of initial pH on anaerobic co-digestion of Salvinia molesta and rice straw for biogas production and kinetics.pdf - Other Download (3MB)
	Text Bukti Korespondensi.pdf - Other Download (756kB)

Abstract

The goal of this study was to investigate the effect of initial pH (6, 6.9 (control), 7, and 8) on biogas production from co-digestion of Salvinia molesta (SM) and rice straw (RS). The ratio of SM and RS was varied to be 40:60 and 0:100. This study used lab-scale batch anaerobic digesters operated at room temperature for 40 days. The results showed that ratio of 40:60 produced more total biogas yield (53.25–61.38 mL/g total solid (TS)) than ratio of 0:100 (45.98–51.20 mL/g TS) at all initial pH variations. Substrate pH during digestion in ratio of 40:60 was more stable than that in ratio of 0:100. The highest total biogas yield in ratio of 40:60 and 0:100 was obtained at initial pH of 8 (digester of P8, 61.38 mL/g TS) and 7 (digester of Q7, 51.20 mL/g TS) respectively because a large amount of volatile fatty acids (VFAs) was converted to biogas. Biogas from ratio of 40:60 contained higher methane content than that from ratio of 0:100. Furthermore, in ratio of 40:60, the methane content of biogas was not affected significantly by variation of initial pH. Comprehensively, the best condition for biogas production was achieved at ratio of 40:60 with initial pH of 8. In order to modeling the kinetics of biogas production, the Cone model was the best of all proposed models (modified Gompertz, first order kinetic, Cone model) because it resulted Mean Absolute Percentage Error (MAPE) of 8.42–18.60% while the others showed MAPE of more than 20%.

Actions (login required)

View Item