TY - JOUR

T1 - Comparative study on effect of shredding and extrusion on biogas production from cauliflower and banana peduncle wastes

AU - Mozhiarasi, Velusamy

AU - Rose, Pious Michealammal Benish

AU - Weichgrebe, Dirk

AU - Srinivasan, Shanmugham Venkatachalam

N1 - Funding Information: CSIR-CLRI communication no. 1531. This work was funded by the Indian Department of Science and Technology (DST) and the German Federal Ministry of Education and Research (BMBF) under the Indo-German Science and Technology Centre (IGSTC) for the 2+2 project titled “RESERVES –Resource and Energy reliability by co-digestion of veg-market and slaughterhouse waste” (Grant number 01DQ15007A). The authors also acknowledge both the German (Leibniz University) and Indian institutional partners (CSIR-Central Leather Research Institute) of this project for permitting to execute the research work. The authors also thank both Indian (Ramky Enviro Engineers Ltd., India) and German industrial partners (Lehmann-UMT GmbH, Germany) of this project for their support.

PY - 2023/11/14

Y1 - 2023/11/14

N2 - India is one of the largest cultivators of banana and cauliflower crops in the world. However, these crops generate huge amounts of wastes whose disposal in an eco-benign way has become a challenging issue. Banana peduncle and cauliflower wastes are promising substrates for bioenergy production through anaerobic digestion (AD). In this present study, shredding and extrusion pretreatment were applied to increase biogas production from banana and cauliflower wastes and the results were compared. Batch anaerobic digestion tests were carried out in 1-L batch AD reactors at a temperature of 37 °C with a substrate to inoculum ratio of 0.5, by following VDI 4630 standards. AD of the extruded cauliflower waste showed a maximum specific biogas yield (SBY) of 587.4 mL/g volatile solids (VS) added, which is 9.8% higher than shredded cauliflower waste (with SBY of 534.7 mL/g VS added). Similarly, AD of the extruded banana peduncle revealed a maximum SBY of 399.2 mL/g VS added, which is 16.5% higher than shredded banana peduncle (with SBY of 342.5 mL/g VS added). The modified Gompertz and logistic kinetic models showed the best fit for biogas production. Thus, it is concluded that the anaerobic digestion of wastes with extrusion as pretreatment could improve biogas production and solid waste management effectively and reduce the waste disposed into dumpsites/landfills. Graphical abstract: [Figure not available: see fulltext.]

AB - India is one of the largest cultivators of banana and cauliflower crops in the world. However, these crops generate huge amounts of wastes whose disposal in an eco-benign way has become a challenging issue. Banana peduncle and cauliflower wastes are promising substrates for bioenergy production through anaerobic digestion (AD). In this present study, shredding and extrusion pretreatment were applied to increase biogas production from banana and cauliflower wastes and the results were compared. Batch anaerobic digestion tests were carried out in 1-L batch AD reactors at a temperature of 37 °C with a substrate to inoculum ratio of 0.5, by following VDI 4630 standards. AD of the extruded cauliflower waste showed a maximum specific biogas yield (SBY) of 587.4 mL/g volatile solids (VS) added, which is 9.8% higher than shredded cauliflower waste (with SBY of 534.7 mL/g VS added). Similarly, AD of the extruded banana peduncle revealed a maximum SBY of 399.2 mL/g VS added, which is 16.5% higher than shredded banana peduncle (with SBY of 342.5 mL/g VS added). The modified Gompertz and logistic kinetic models showed the best fit for biogas production. Thus, it is concluded that the anaerobic digestion of wastes with extrusion as pretreatment could improve biogas production and solid waste management effectively and reduce the waste disposed into dumpsites/landfills. Graphical abstract: [Figure not available: see fulltext.]

KW - Anaerobic digestion

KW - Banana peduncle waste

KW - Biogas

KW - Cauliflower waste

KW - Extrusion

KW - Shredding

UR - http://www.scopus.com/inward/record.url?scp=85176459553&partnerID=8YFLogxK

U2 - 10.1007/s10668-023-03990-8

DO - 10.1007/s10668-023-03990-8

M3 - Article

AN - SCOPUS:85176459553

JO - Environment, Development and Sustainability

JF - Environment, Development and Sustainability

SN - 1387-585X

ER -