The effect of Inoculum to Substrate and Carbon to Nitrogen Ratios on the Biogas Quantity and Quality from Anaerobic Digestion of Salvinia molesta: Experimental and Kinetic Studies

Iqbal Syaichurrozi; M. Fakhri  Basyir; Rafi Muhammad  Farraz; Putri Kurnia  Villta; Nabilah  Nabilah; Rusdi  Rusdi; Sutaryo  Sutaryo

doi:10.21771/jrtppi.2022.v13.no1.p1-11

Authors

Iqbal Syaichurrozi Universitas Sultan Ageng Tirtayasa
M. Fakhri Basyir
Rafi Muhammad Farraz
Putri Kurnia Villta
Nabilah Nabilah
Rusdi Rusdi
Sutaryo Sutaryo

DOI:

https://doi.org/10.21771/jrtppi.2022.v13.no1.p1-11

Keywords:

Anaerobic digestion, Biogas, C/N, I/S, Salvinia molesta

Abstract

The purpose of this study was to investigate the effect of inoculum to substrate (I/S) and carbon to nitrogen (C/N) ratios on the biogas quantity and quality from anaerobic digestion of Salvinia molesta (SM). The I/S was adjusted to become 1.5, 2, 2.5 and the C/N was to become 21.5, 25, 30. Anaerobic digestion (AD) was operated during 30 days under the room pressure and temperature. The results showed that increase in I/S from 1.5 to 2.5 increased the biogas yield from 19.01 to 33.84 mL/g VS. Besides that, it increased the methane content from 52.54 to 69.01%. Furthermore, increase in C/N to 21.5 to 30 decreased the biogas yield from 33.84 to 30.85 mL/g VS and then decreased the methane content from 69.01 to 6.99%. Hence, the best condition was in the substrate with I/S of 2.5 and C/N of 21.5. The measured data was successfully predicted through the modified Gompertz and the first order kinetic models with R² of 0.9905 and 0.9476 respectively.

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