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Enhancement of Methane Production from Vegetable, Fruit and Flower Market Wastes Using Extrusion as Pretreatment and Kinetic Modeling

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Abstract

Organic wastes from wholesale vegetable, fruit, and flower markets are one among the major sources of centralized waste generation in urban cities, which are predominantly disposed at dumpsites. Sustainable solution for the effective treatment and disposal of these wastes from Indian urban centers needs to be explored. Anaerobic digestion (AD) process coupled with extrusion as a pretreatment prior to AD was studied to increase methane production from vegetable, fruit, and flower market wastes. The detailed waste characterization and bio-methane potential (BMP) tests of vegetable, fruit, and flower market wastes were carried out. From the results of BMP tests, the highest specific methane yield (SMY) of 332.7 mLN/g oDM (31% increase) was obtained for extruded fruit market wastes compared with non-extruded wastes, which showed SMY of 253.9 mLN/g oDM. Similarly, the SMY of vegetable and flower market wastes was significantly increased (p < 0.05) to 319.6 mLN/g oDM (+ 35.5%) and 188.1 mLN/g oDM (+ 42.3%), respectively, as a result of extrusion pretreatment. Further, AD of extruded wastes showed 11.4–17.2% increase in the oDM reduction in concurrence with the increased SMY. The energy potential of extruded and non-extruded wastes varied between 6.4–10.9 MJ/kg DM and 4.7–9.4 MJ/kg DM, respectively. In addition, from the profile of bio-methane production, it is observed that the extruded wastes reached 95% of SMY in 14–17 days unlike non-extruded wastes, which took 17–23 days to reach the same value thereby attaining steady-state condition faster than non-extruded wastes. Among the three models used, the logistic model showed best fit with R2 value of 0.96–0.98 with minimum SMY deviation < 2.8% than first-order kinetic and modified Gompertz models. Results of the study revealed that extrusion pretreatment of wholesale vegetable, fruit, and flower markets wastes prior to AD was found to be effective in increasing the methane production during anaerobic treatment of these wastes from urban centers.

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Abbreviations

AD:

anaerobic digestion

BMP:

bio-methane potential

SMY:

specific methane yield

MSW:

municipal solid wastes

FAO:

Food and Agriculture Organization

SDGs:

sustainable development goals

VW:

vegetable market wastes

FRW:

fruit market wastes

FLW:

flower market wastes

EVW:

extruded vegetable market wastes

EFRW:

extruded fruit market wastes

EFLW:

extruded flower market wastes

DM:

dry matter

oDM:

organic dry matter

VFA:

volatile fatty acids

NDF:

neutral detergent fiber

ADF:

acid detergent fiber

NfE:

nitrogen free extract

mLN :

normalized milliliter, volume of methane gas corrected to standard temperature and pressure

BMBF:

German Federal Ministry of Education and Research

DST:

Department of Science and Technology

IGSTC:

Indo-German Science and Technology Centre

CLRI:

Central Leather Research Institute

RESERVES:

Resource and energy reliability by co-digestion of veg-market and slaughterhouse waste

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Acknowledgments

The authors thank the Director, Central Leather Research Institute (CLRI) for permitting to carry out the research work. The authors also acknowledge both German and Indian Industrial partners (Lehmann-UMT GmbH, Germany & Ramky Enviro Engineers Private Ltd., India) of this project for their support.

Funding

This work was funded 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) for the 2+2 Project “RESERVES—Resource and energy reliability by co-digestion of veg-market and slaughterhouse waste.”

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Correspondence to Shanmugham Venkatachalam Srinivasan.

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Mozhiarasi, V., Weichgrebe, D. & Srinivasan, S.V. Enhancement of Methane Production from Vegetable, Fruit and Flower Market Wastes Using Extrusion as Pretreatment and Kinetic Modeling. Water Air Soil Pollut 231, 126 (2020). https://doi.org/10.1007/s11270-020-04469-2

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  • DOI: https://doi.org/10.1007/s11270-020-04469-2

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