The daily biogas production for each anaerobic digester was recorded using the water displacement method. The corresponding cumulative biogas volume was also calculated. The TS, volatile solids (VS), and pH of the materials were determined using the standard water and wastewater examination methods (American Public Health Association 1995). Total carbon (TC) and nitrogen content (TN) were analyzed using the Walkley-Black (Nelson and Sommers 1982) and Kjeldahl (Bremner and Mulvaney 1982) methods, respectively. The volatile fatty acid (VFA) was analyzed through colorimetric method (Chinese Academy of Sciences, 1984), and the result was expressed in acetic acid. The cellulose, hemicellulose, and lignin contents were analyzed based on the method used by Wang and Xu (1987) as well as by Lin et al. (2009).
The daily biogas production for each anaerobic digester was recorded using the water displacement method. The corresponding cumulative biogas volume was also calculated. The TS, volatile solids (VS), and pH of the materials were determined using the standard water and wastewater examination methods (American Public Health Association 1995). Total carbon (TC) and nitrogen content (TN) were analyzed using the Walkley-Black (Nelson and Sommers 1982) and Kjeldahl (Bremner and Mulvaney 1982) methods, respectively. The volatile fatty acid (VFA) was analyzed through colorimetric method (Chinese Academy of Sciences, 1984), and the result was expressed in acetic acid. The cellulose, hemicellulose, and lignin contents were analyzed based on the method used by Wang and Xu (1987) as well as by Lin et al. (2009).
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