Abstract
Anaerobic digestion of limed fleshing solid waste from leather-processing industry and effluent treatment liquid waste was studied in a two-phase digester. The hydrolysis and acidification stages resulted in the formation of volatile fatty acid (VFA), where the maximum concentration of total VFA observed in the acidogenic reactor was 18,225mg/L and the average VFA concentration was 10,574mg/L for hydraulic retention time (HRT) of 10days. The hydrolyzed predigested material was tested in a methanogenesis reactor for biogas generation at HRT of 20 days. The two-phase process of the digestion system has been modeled using adaptive neuro-fuzzy inference system (ANFIS) with HRT, pH and organic loading rate (OLR) as input parameters and cumulative gas production as output parameter. The average CH4 production rate over the entire study period was 0.31m3CH4/kg VS destroyed and 0.15m3 CH4/kg VS fed at an overall average OLR of 1.05 ± 0.05kg VS/m3day. Modeling with ANFIS using HRT, OLR and pH as inputs and cumulative production of gas as output produced a mean-square error of only 0.00049 which is relatively more accurate with reference to available literature.
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Arumugam, T., Parthiban, L. & Rangasamy, P. Two-Phase Anaerobic Digestion Model of a Tannery Solid Waste: Experimental investigation and Modeling with ANFIS. Arab J Sci Eng 40, 279–288 (2015). https://doi.org/10.1007/s13369-014-1408-9
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DOI: https://doi.org/10.1007/s13369-014-1408-9