Lab-scale biogas production from co-digestion of super-intensive shrimp sludge and potential biomass feedstocks

Year 2022, Volume: 6 Issue: 1, 131 - 142, 31.03.2022

Nam Tran , Thao Huynh Van , Khanh Huynh , Luan Nguyen Ngan Nguyen , Diem Huynh Danh Dinh Cong Nguyen

https://doi.org/10.30521/jes.973569

Cited By: 2

Abstract

This study evaluated biogas production potentials from local biomass feedstocks comprising of rice straw (RS), steamed lemongrass (SL), bagasse (BA) and desiccated coconut (DC) on super-intensive shrimp sludge (SS) anaerobic digestion. A series of batch anaerobic digestion experiments was conducted at an organic loading rate of 50 g-VS L-1 and a C/N ratio of 25 under mesophilic conditions. The results indicate that co-digested biomass substrates are more suitable than single sludge except for DC supplementation, which exhibited a severe pH inhibition for methanogenesis activities. A reactor supplemented with BA achieved the highest overall biogas production (126.78 L kg-VSadded-1), which increased biogas yields 53.70% compared to a mono-sludge reactor. Furthermore, reactors with RS and SL increased biogas yields by 26.40% and 29.21%, respectively. Irrespective of initial materials, the H2S concentration in biogas compositions was measured at very high levels (23,710 - 65,040 ppm) after 10-15 days of digestion, while a decreasing trend was recorded for the remaining digestion period (16 - 60 days), yet still maintained relatively high levels (5,873 - 9,155 ppm). The study suggests that future works should focus on pH neutralization within the reactor with DC substrates and H2S removal in biogas composition.

Keywords

Batch anaerobic digestion, Biogas production, Biomass feeding, Co-digestion, Shrimp sludge, Super-intensive shrimp cultivation

Supporting Institution

YUKO-KEISO CO. LTD. JAPAN

Thanks

The authors are very thankful to YUKO-KEISO CO., LTD, JAPAN for funding this research. We also thank Dr. Nigel K. Downes (Researcher - CMI Integrated Expert at Can Tho University) for proofreading the manuscript.

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