2012 Fiscal Year Final Research Report

Anaerobic digestion for halophyte biomass utilization to remediate agricultural land

Research Project

Project/Area Number	23658278
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Boundary agriculture
Research Institution	The University of Kitakyushu
Principal Investigator	YASUI Hidenari 北九州市立大学, 国際環境工学部, 教授 (70515329)
Project Period (FY)	2011 – 2012
Keywords	耐塩メタン発酵 / 中央アジア / 塩害土壌修復 / 塩類蓄積性植物
Research Abstract	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.

(5 results)