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Waste and Biomass Valorization

, Volume 10, Issue 8, pp 2119–2128 | Cite as

Assessment of Batch and Semi-continuous Anaerobic Digestion of Food Waste at Psychrophilic Range at Different Food Waste to Inoculum Ratios and Organic Loading Rates

  • Pedro MuñozEmail author
Short Communication

Abstract

Purpose

At present, most studies have been focused on anaerobic digestion (AD) of food waste (FW) at temperatures above 35 °C. While AD of FW at psychrophilic temperature has been rarely reported, this may be a more economical procedure for municipal solid waste (MSW) management by reducing the organic fraction content and the corresponding environmental impact from its disposal.

Methods

FW and inoculum have been characterized and AD of FW assays have been run for 12 weeks in accordance with VDI 4630. The effect of FW to inoculum ratio (FWIR) has been assessed in batch assays and the organic load rate (OLR) has been tested in semi-continuous operation mode. In addition, soluble chemical oxygen demand (SCOD) evolution has been periodically measured during all tests.

Results

Results showed an important reduction of specific methane yield (SMY) (up to 65%) when FWIR is increased (from 0.5 to 1.5) in batch tests while SCOD removal remains quite constant (approx. 90%). On the other hand, during semi-continuous operation SMY and SCOD removal have been highly reduced (up to approx. 70 and 73%) when OLR is increased (from 1 to 3 g_VS L−1 d−1).

Conclusions

Despite the low SMY, the AD of FW at psychrophilic temperature is a feasible solution, especially at low organic loads. Therefore, it may be used in decentralized strategies for improving the MSW management. This operation mode reduces installation costs and reactor operation complexity at the same time decreases the SCOD of municipal waste stream.

Keywords

Biogas Methane Low temperature Food waste Organic load rate Substrate to inoculum rate 

Notes

Acknowledgements

Special thanks go out to the Chilean Ministry of Education, in particular to CONICYT which has been supported this research throughout the FONDECYT INICIACION Project Number 11.140.728.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Facultad de IngenieríaUniversidad Autónoma de ChileTalcaChile

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