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

Nam TRAN; Thao HUYNH VAN; Khanh HUYNH; Luan NGUYEN; Ngan NGUYEN; Diem HUYNH; Danh DİNH; Cong NGUYEN

doi:10.30521/jes.973569

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

Authors : Nam TRAN, Thao HUYNH VAN, Khanh HUYNH, Luan NGUYEN, Ngan NGUYEN, Diem HUYNH, Danh DİNH, Cong NGUYEN

Pages : 131-142

Doi:10.30521/jes.973569

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Publication Date : 2022-03-31

Article Type : Research Paper

Abstract :This study evaluated biogas production potentials from local biomass feedstocks comprising of rice straw insert ignore into journalissuearticles values(RS);, steamed lemongrass insert ignore into journalissuearticles values(SL);, bagasse insert ignore into journalissuearticles values(BA); and desiccated coconut insert ignore into journalissuearticles values(DC); on super-intensive shrimp sludge insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(23,710 - 65,040 ppm); after 10-15 days of digestion, while a decreasing trend was recorded for the remaining digestion period insert ignore into journalissuearticles values(16 - 60 days);, yet still maintained relatively high levels insert ignore into journalissuearticles values(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

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