Manal Ali
ABSTRACT
Anaerobic digestion processes have been widely used for biogas production from various substrates, however, without much attention to the saline effluents containing organic compounds. This study aims to investigate the use of hypersaline lake sediment as inoculum, after a hierarchical acclimation process, at different inoculum-to-substrate ratios (ISRs) and salt (NaCl) concentrations. Batch-mode experiments were conducted to achieve this goal using glucose as a substrate. ISRs ranging from 11.5 to 28.74 gVSS/gCOD and NaCl concentrations of 20-30 g/L were tested. Maximum cumulative biogas production (CBP) of 55 mL was achieved at ISR of 11.49 gVSS/gCOD and NaCl concentration of 30 g/L, resulting a biogas production rate (BPR) and specific biogas production (SBP) of 1.08 mL/h and 220 mL/l, respectively. Moreover, at same conditions, the highest chemical oxygen demand (COD) removal efficiency of 84.12 % was resulted. The highest acidification corresponded by maximum production of volatile fatty acids (VFAs) of 1652.2 mg/L was found at ISR of 11.5 gVSS/gCOD. The acetic acid was predominant with a maximum concentration of 500 mg/L. A modified Gompertz equation successfully described the time-course cumulative biogas production (R2 = 0.989). Eventually, at optimum conditions, the microbial enriched sediment collected from hypersaline lakes proved its easy and effective use as inoculum for biogas production from saline wastewater.
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Index Terms
- Feasibility of Using Hypersaline Lake Sediment as Inoculum for Biogas Production from Anaerobic Digestion of Saline Wastewater
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