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Multi‐substrate anaerobic co‐digestion of citrus pulp, lawn grass, and chicken manure—A batch study
Author(s) -
Sukhesh Muramreddy Jugal,
Muske Atul,
Venkateswara Rao Polisetty
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13153
Subject(s) - anaerobic digestion , biogas , pulp and paper industry , response surface methodology , central composite design , digestion (alchemy) , manure , mesophile , pulp (tooth) , chemistry , environmental science , waste management , agronomy , methane , biology , engineering , chromatography , medicine , genetics , organic chemistry , pathology , bacteria
Anaerobic digestion of organic waste is a promising alternative to landfilling and is being encouraged by current policies in India. However, nutritional imbalance of single waste as a substrate in anaerobic digestion is limiting the effective degradation in biogas production. Co‐digestion of multiple organic wastes where the digestion of two or more substrates is carried out in a single digester is a promising method to enhance the nutritional balance. The present study investigated the possibilities of improving biogas production with co‐digestion of citrus pulp (CP), lawn grass (LG), and chicken manure (CM) based on the total solid loading (TS %). The design of experiments and analysis of the co‐digestion effect were carried out with central composite design (CCD) and response surface methodology (RSM), respectively. Biogas production was found to vary more with respect to total solid loading (TS %) than C/N ratio of the co‐digestion mix. The low influence of C/N ratio may be due to prevalence of optimal C/N ratio of 16–33 in all co‐digestion mixes. The adopted central composite design–response surface methodology (CCD–RSM) led to maximum biogas production of 688 mL at CP of 0.28 (TS %), LG of 9.4 (TS %), and CM of 4 (TS %). The CCD–RSM is a suitable approach to maximize the biogas production in multi‐substrate anaerobic co‐digestion. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019