Browsing by Author "Maharsih, Inggit Kresna"

Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    Effect of biochar addition on biogas production using konjac waste through mesophilic two-phase anaerobic digestion
    (Springer, 2024-08-29) Sugiarto, Yusron; Ahmad, Ary Mustofa; Setyaningsih, Yeni Ika; Maharsih, Inggit Kresna; Sunyoto, Nimas Mayang Sabrina; Setyawan, Hendrix Yulis; Zhu, Mingming
    Purpose: This study aimed to investigate the influence of biochar supplementation in the mesophilic two-phase anaerobic digestion process for konjac waste. Methods: Reactors with a working volume of 60 mL were utilised to incubate cultures containing biochar. In the first phase, the cultures were maintained at 32 °C and a pH of 5 to facilitate the production of hydrogen. In the second phase, the cultures were adjusted to 37 °C and a pH of 7 to promote methane production. The concentration of konjac flour waste varied between 0 and 500 g/L, while the ratio of biochar addition ranged from 0 to 25 g/L. Biogas production was measured daily using the volume displacement method, and the pH of the cultures was monitored both before and after the experiment. Results: The findings show that using biochar has a beneficial effect on biogas production from konjac flour waste. During the initial phase of the experiment, incorporating biochar with a concentration of 15 g/L led to substantial improvements, elevating the maximum H2 production rates by 9.6%. Furthermore, the addition of biochar led to an 84% increase in H2 yield during the initial phase. Similarly, in the second phase, introducing biochar with a concentration of 15 g/L resulted in a 22.2% increase in the maximum CH4 production rates and a 2.5 times increase in CH4 yield. Conclusions: Overall, this work confirms the beneficial effects of biochar on the H2 and CH4 production from konjac flour waste using the mesophilic two-phase anaerobic digestion method for sustainable energy.
  • Thumbnail Image
    ItemOpen Access
    Enhancing methane production by adding Fe3+ in mesophilic anaerobic digestion of cheese waste
    (EDP Sciences, 2025-03-07) Sugiarto, Yusron; Pamungkas, Bintang; Wibisono, Yusuf; Izza, Ni’matul; Mufidah, Elya; Maharsih, Inggit Kresna; Nugroho, Wahyunanto Agung; Sofi’i, Imam; Zhu, Mingming
    The advancements in cheese production technology have resulted in increased waste generation, especially in the form of liquid byproducts left over after the milk clotting process. This research examines the possibility of using cheese waste to produce methane (CH4) through mesophilic anaerobic digestion and investigates how adding iron (Fe) can improve CH4. Field experiments were conducted to evaluate the effects of varying concentrations of cheese waste (0–33.33 g/L) and FeCl3 (0–3.0 g/L) on CH4 yield. Results revealed that the addition of 2 g/L FeCl3 achieved the highest cumulative CH4 yield and production rate, with increases of 68% and 65% over the control, respectively. The study also monitored pH levels and found that the best treatment maintained a near-neutral pH of 6.79 by day 50, which is important for sustaining effective microbial activity. This study highlights the potential of incorporating Fe supplementation to optimize CH4 yields from cheese waste and other organic substrates, contributing to more sustainable and efficient renewable energy production.