Anaerobic digestion for halophyte biomass utilization to remediate agricultural land

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An artificial holophyte biomass was prepared using Panicum sp. with NaCl salt (158 g-COD/kg-wet biomass, 70g-NaCl/kg-wet biomass) for the contentious anaerobic digestion test under mesophilic condition at 35 degree Celsius that was composed of a digester and solid liquid separation module to extend the biological reaction time. About 50% of the influent COD fraction was successfully converted to methane gas under volumetric COD loading rate of 2.0 kg/m3/d with trace accumulation of volatile fatty acids. Based on the dynamic response of the reactor for over 200 days,the biogas production, sludge concentration in the reactor and effluent COD concentration were simulated by modifying existing process model (ADM1). In order to reproduce these responses, a definition of an additional state variable (lignin) and differentiation of disintegration kinetics over the influent organics (slowly and readily) were needed.