Effect of Substrate/Water Ratio on Biogas Production from the Mixture Substrate of Rice Straw and Salvinia molesta

Iqbal Syaichurrozi; Suhirman Suhirman; Topik Hidayat

doi:10.21771/jrtppi.2021.v12.no2.p45-55

Authors

Iqbal Syaichurrozi Universitas Sultan Ageng Tirtayasa
Suhirman Suhirman Department of Chemical Engineering, Faculty of Engineering, University of Sultan Ageng Tirtayasa
Topik Hidayat Department of Chemical Engineering, Faculty of Engineering, University of Sultan Ageng Tirtayasa

DOI:

https://doi.org/10.21771/jrtppi.2021.v12.no2.p45-55

Keywords:

Biogas, Kinetic, Rice straw, Salvinia molesta, Substrate/Water, Total solid

Abstract

The substrate/water (S/W) ratio is one of the affecting parameters in anaerobic digestion (AD) since it affects the concentration of total solids (TS) in the biogas feedstocks. The appropriate S/W ratio has to be found to result in a high biogas yield. The goal of this study was to look into the influence of S/W ratio on biogas production from mixture substrate of rice straw and Salvinia molesta. Ratio of S/W was varied to be 1/7 w/v (TS 9.67%w/w), 1/10 w/v (TS 7.52%w/w), 1/13 w/v (TS 6.15%w/w), 1/16 w/v (TS 5.20%w/w). The results showed that S/W of 1/7, 1/10, 1/13, 1/16 resulted a total biogas yield of 22.86, 38.67, 42.71, 43.69 mL/g TS respectively. Decreasing TS from 9.67 %w/w (S/W of 1/7) until 6.15%w/w (S/W of 1/13) could increase the TS removal from 31.03% until 55.66%. However, at TS 5.20%w/w (S/W of 1/16), the TS removal was lower than that at TS 6.15%w/w (S/W of 1/13). The modified Gompertz (R² = 0.94 – 0.98) can predict evolution of biogas production with higher precision than the first order kinetic (R² = 0.91 – 0.98). The optimum TS was successfully predicted to become 5.40%w/w.

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