1. Grass as a high potential by-product: Buffalo grass to biogas and the increase of system performance and stability.
- Author
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Sawanon, Suriya, Leungprasert, Suchat, Sillapacharoenkul, Boonsong, Khunanake, Roj, Soiklom, Siriwan, and Sinbuathong, Nusara
- Subjects
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CATTLE manure , *BIOGAS , *SEWAGE sludge digestion , *BIOGAS production , *CHEMICAL oxygen demand , *ANAEROBIC reactors , *ANAEROBIC digestion - Abstract
Buffalo grass and alkaline-pretreated buffalo grass samples were co-digested with cow manure separately to generate biogas in anaerobic reactors. The study considered a solid content of 20% (10% buffalo grass and 10% cow manure). The methane (CH 4) content and CH 4 yield of the distinct experiments were compared. For the untreated buffalo grass, the weighed buffalo grass was mixed with cow manure and water. For the alkaline-pretreated buffalo grass, the weighed buffalo grass was soaked in 1% sodium hydroxide for 1 day prior to being mixed with cow manure and water. The untreated and pretreated buffalo grass-manure were fed semi-continuously at the rate of 125 mL/day for five days feeding in a 5 L reactor, with 40 days hydraulic retention time. The experiments were conducted for approximately 100 days. Results were reported when the systems were in steady-state conditions. The chemical oxygen demand (COD) conversion efficiency of co-digestion of the untreated and pretreated buffalo grass-manure were 46.21 and 62.76%, respectively, and for the total volatile solids (TVS) were 68.50 and 71.80%, respectively. The CH 4 contents generated from co-digestion of the untreated and pretreated buffalo grass-manure were 48.32% and 50.36%, respectively. The CH 4 yields generated from co-digestion of the untreated and pretreated buffalo grass-manure were 328 and 385 L/kgTVS conversion, respectively. It was observed from the experiments that pretreatment of the buffalo grass prior to co-digestion provided system stability during biogas production. • Buffalo grass has high potential as a biomass source for biogas production. • Co-digestion of NaOH-pretreated buffalo grass-manure increases CH 4 yield. • CH 4 content and CH 4 yield are 50.36% and 387 L/kg TVS conversion. • COD and TVS conversion efficiency reach 62.76 and 71.80%. • System stability increases noticeably. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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