TY - JOUR

T1 - Enhancing methane production by anaerobic co-digestion of extruded organic wastes from slaughterhouse and vegetable market in batch and continuous processes

AU - Mozhiarasi, Velusamy

AU - Balakumar, Rajan

AU - Benish Rose, Pious Michealammal

AU - Speier, Christopher Josef

AU - Weichgrebe, Dirk

AU - Srinivasan, Shanmugham Venkatachalam

AU - Suthanthararajan, Rengasamy

N1 - Funding Information: Indo-German Science and Technology Centre (IGSTC) (Grant number 01DQ15007A) under Department of Science and Technology (DST) and the German Federal Ministry of Education and Research (BMBF) for funding under the 2 + 2 Project “Resource and energy reliability by co-digestion of veg-market and slaughterhouse waste”. Funding Information: The authors acknowledge the Indo-German Science and Technology Centre (IGSTC) (Grant number 01DQ15007A) under Department of Science and Technology (DST) and the German Federal Ministry of Education and Research (BMBF) for funding under the 2 + 2 Project “Resource and energy reliability by co-digestion of veg-market and slaughterhouse waste”. The authors also thank the Director, CSIR-Central Leather Research Institute for providing support to carry out the research work (CSIR-CLRI communication no. 1383). The authors also thank the Industrial partners of this project (Lehmann-UMT GmbH, Germany & Ramky Enviro Engineers Ltd., India) for their support.

PY - 2021/11

Y1 - 2021/11

N2 - Abstract: The organic wastes generated from centralized wholesale markets from urban centres are predominantly disposed in dumpsites/landfills. Although anaerobic digestion (AD) of wastes is a promising option for producing bio-fuel, the key barrier is the limitation in the waste conversion efficiency that demands the need for the organic waste pretreatment. Hence, the extrusion pre-treatment of wastes prior to AD of slaughterhouse wastes (ESHW) with mixed vegetable, fruit and flower market wastes (EVMW), from a centralized-wholesale market in an urban area, was studied in batch and continuous AD processes. Batch experiments were carried out in mono- and co-digestion modes of extruded wastes. The results of the batch study revealed maximum specific methane yield of 354.9 mLN/g oDM during anaerobic co-digestion of extruded slaughterhouse wastes with mixed vegetable, fruit and flower market wastes in 1:3 proportion (ESHW/EVMW). Based on these results, lab-scale continuous reactor study (15 L) at varying organic loading rates (OLR) was carried out and the maximum biogas yield of 618.5 mLN/g oDM with a methane content of 62.6% and energy potential of 12.2 MJ/kg DM was obtained for extruded wastes at an OLR of 2.5 g oDM/L/d (E) when compared with non-extruded wastes that showed biogas potential of 503.7 mLN/g oDM (with energy potential of 10.2 MJ/kg DM). The outcome of the study revealed that extrusion pretreatment along with anaerobic co-digestion resulted in an increase in the biogas production therein showing enhancement in green energy production during anaerobic co-treatment of centralized wholesale market and slaughterhouse wastes in urban centres. Graphic Abstract: [Figure not available: see fulltext.].

AB - Abstract: The organic wastes generated from centralized wholesale markets from urban centres are predominantly disposed in dumpsites/landfills. Although anaerobic digestion (AD) of wastes is a promising option for producing bio-fuel, the key barrier is the limitation in the waste conversion efficiency that demands the need for the organic waste pretreatment. Hence, the extrusion pre-treatment of wastes prior to AD of slaughterhouse wastes (ESHW) with mixed vegetable, fruit and flower market wastes (EVMW), from a centralized-wholesale market in an urban area, was studied in batch and continuous AD processes. Batch experiments were carried out in mono- and co-digestion modes of extruded wastes. The results of the batch study revealed maximum specific methane yield of 354.9 mLN/g oDM during anaerobic co-digestion of extruded slaughterhouse wastes with mixed vegetable, fruit and flower market wastes in 1:3 proportion (ESHW/EVMW). Based on these results, lab-scale continuous reactor study (15 L) at varying organic loading rates (OLR) was carried out and the maximum biogas yield of 618.5 mLN/g oDM with a methane content of 62.6% and energy potential of 12.2 MJ/kg DM was obtained for extruded wastes at an OLR of 2.5 g oDM/L/d (E) when compared with non-extruded wastes that showed biogas potential of 503.7 mLN/g oDM (with energy potential of 10.2 MJ/kg DM). The outcome of the study revealed that extrusion pretreatment along with anaerobic co-digestion resulted in an increase in the biogas production therein showing enhancement in green energy production during anaerobic co-treatment of centralized wholesale market and slaughterhouse wastes in urban centres. Graphic Abstract: [Figure not available: see fulltext.].

KW - Biogas

KW - Continuous anaerobic reactor

KW - Extrusion pre-treatment

KW - Slaughterhouse

KW - Solid waste

KW - Urban centres

KW - Vegetable market wastes

UR - http://www.scopus.com/inward/record.url?scp=85114314036&partnerID=8YFLogxK

U2 - 10.1007/s10098-021-02198-6

DO - 10.1007/s10098-021-02198-6

M3 - Article

AN - SCOPUS:85114314036

VL - 23

SP - 2727

EP - 2740

JO - Clean Technologies and Environmental Policy

JF - Clean Technologies and Environmental Policy

SN - 1618-954X

IS - 9

ER -