TY - JOUR

T1 - Influence of pre-treatments and anaerobic co-digestion of slaughterhouse waste with vegetable, fruit and flower market wastes for enhanced methane production

AU - Mozhiarasi, Velusamy

AU - Speier, Christopher Josef

AU - Rose, Pious Michealammal Benish

AU - Weichgrebe, Dirk

AU - Venkatachalam, Srinivasan Shanmugham

N1 - Funding Information: CSIR-CLRI communication no. 1575. This work was supported by the German Federal Ministry of Education and Research (BMBF) and the Indian Department of Science and Technology (DST) under the Indo-German Science and Technology Centre (IGSTC) (Grant Number 01DQ15007A) under the 2+2 Project ‘RESERVES—Resource and energy reliability by co-digestion of veg-market and slaughterhouse waste’. The authors thank the Director, Central Leather Research Institute (CLRI) for permitting to carry out the research study. The authors also acknowledge both German and Indian industrial partners (Lehmann-UMT GmbH, Germany and Ramky Enviro Engineers Ltd., India) of this project for their support.

PY - 2023/6

Y1 - 2023/6

N2 - Considerable amounts of slaughterhouse wastes (SHW) are generated in Indian urban centres causing serious environmental issues that demand effective treatment and disposal. The present study evaluates the effect of pasteurization (70 °C for 1 h) and extrusion pre-treatment on pathogen removal and methane production from SHW in anaerobic mono- and co-digestion with mixed vegetable, fruit and flower market wastes (VMW) under controlled batch anaerobic digestion (AD) tests. The complete destruction of pathogen was observed in post-pasteurized SHW, whereas the post-extruded SHW showed significant reduction (p < 0.05) in pathogen concentration (with a Salmonella count of 29.3 × 103 CFUs/g). The results of AD test revealed that the maximum specific methane yield (SMY) of 273.2 mLN/g oDM was obtained by anaerobic co-digestion of SHW:VMW in 1:3 proportion. Further enhancement in the SMY was obtained with extrusion pre-treatment of SHW (SHWE) by 11.5% (i.e. 304.8 mLN/g oDM) in 1:3 proportion of SHWE:VMW. Modified Gompertz and logistics models fitted the kinetic data of AD process well. Results confirmed that the proposed extrusion pre-treatment of SHW coupled with anaerobic co-digestion improved the oDM reduction, methane potentials and pathogen removal, thereby making it a suitable pre-treatment during anaerobic co-treatment of SHW with VMW from centralized wholesale markets from urban centres.

AB - Considerable amounts of slaughterhouse wastes (SHW) are generated in Indian urban centres causing serious environmental issues that demand effective treatment and disposal. The present study evaluates the effect of pasteurization (70 °C for 1 h) and extrusion pre-treatment on pathogen removal and methane production from SHW in anaerobic mono- and co-digestion with mixed vegetable, fruit and flower market wastes (VMW) under controlled batch anaerobic digestion (AD) tests. The complete destruction of pathogen was observed in post-pasteurized SHW, whereas the post-extruded SHW showed significant reduction (p < 0.05) in pathogen concentration (with a Salmonella count of 29.3 × 103 CFUs/g). The results of AD test revealed that the maximum specific methane yield (SMY) of 273.2 mLN/g oDM was obtained by anaerobic co-digestion of SHW:VMW in 1:3 proportion. Further enhancement in the SMY was obtained with extrusion pre-treatment of SHW (SHWE) by 11.5% (i.e. 304.8 mLN/g oDM) in 1:3 proportion of SHWE:VMW. Modified Gompertz and logistics models fitted the kinetic data of AD process well. Results confirmed that the proposed extrusion pre-treatment of SHW coupled with anaerobic co-digestion improved the oDM reduction, methane potentials and pathogen removal, thereby making it a suitable pre-treatment during anaerobic co-treatment of SHW with VMW from centralized wholesale markets from urban centres.

KW - Anaerobic digestion

KW - Co-digestion

KW - Energy

KW - Extrusion

KW - Methane potential

KW - Pasteurization

KW - Slaughterhouse wastes

UR - http://www.scopus.com/inward/record.url?scp=85109587792&partnerID=8YFLogxK

U2 - 10.1007/s13399-021-01709-1

DO - 10.1007/s13399-021-01709-1

M3 - Article

AN - SCOPUS:85109587792

VL - 13

SP - 7079

EP - 7096

JO - BIOMASS CONVERSION AND BIOREFINERY

JF - BIOMASS CONVERSION AND BIOREFINERY

SN - 2190-6815

IS - 8

ER -