Abstract
This study aimed to evaluate potential biogas production from Ludwigia hyssopifolia (water primrose) and examine the effect of alkaline pretreatment on samples through biogas production efficiencies. The research was carried out for 45 days of operation from anaerobic mono-digestion of water primrose by using a batch experiment. Pretreatment was applied for substrate using sodium hydroxide (NaOH) solution (w/v) at different concentrations (0, 1, 2, 3, and 4%) with 10% of total solids (TS) based on dry matter. The scanning electron microscopy (SEM) images were captured to investigate the characteristics of the raw material and pretreated biomass. The results showed that the treatment with 2% NaOH has the highest performance in biogas yield (8072.00 mL) and methane content (64.72%). Notably, the increase (3, 4%) or decreasing (0, 1%) NaOH concentration in treating water primrose did not achieve a significant improvement. Further investigation in the power potential of produced biogas was calculated, and the result was 22,382.19 W/m3 power. Consequently, the feasibility of the alkaline pretreatment method for biogas production and achievable potential for energy efficiency indicates that water primrose is appropriate agro-weed biomass for bioenergy applications.
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Abbreviations
- E :
-
amount of heat energy dissipated (J)
- M c :
-
mass of calorimeter (g)
- C c :
-
specific heat capacity of the calorimeter (390 J kg−1 K−1)
- Δθ :
-
change in temperature (°C)
- M w :
-
mass of water (g)
- C w :
-
specific heat capacity of water (4200 J kg−1 K−1)
- t :
-
time taken for the energy to be dissipated (s)
- NaOH:
-
sodium hydroxide
- KOH:
-
potassium hydroxide
- Ca(OH)2 :
-
calcium hydroxide
- CH4 :
-
methane
- CO2 :
-
carbon dioxide
- H2 :
-
hydrogen
- N2 :
-
nitrogen
- H2S:
-
hydrogen sulfide
- HRT:
-
hydraulic retention time
- LPG:
-
liquefied petroleum
- TS:
-
total solids
- VS:
-
volatile solids
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Acknowledgments
The authors gratefully acknowledged the School of Renewable Energy, Program in Biotechnology, and Energy Research Center, Maejo University, Chiang Mai, and Center of Excellence in Bioresources for Agriculture, Industry and Medicine, Chiang Mai University, Chiang Mai 50200, Thailand, for the research facilities to accomplish this experimental study.
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Nong, H.T., Whangchai, K., Unpaprom, Y. et al. Development of sustainable approaches for converting the agro-weeds Ludwigia hyssopifolia to biogas production. Biomass Conv. Bioref. 12, 793–801 (2022). https://doi.org/10.1007/s13399-020-01083-4
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DOI: https://doi.org/10.1007/s13399-020-01083-4