NDLI: Effect of a Trace Element Addition Strategy on Volatile Fatty Acid Accumulation in Thermophilic Anaerobic Digestion of Food Waste

Content Provider	Springer Nature Link
Author	Yirong, C. Heaven, S. Banks, C. J.
Copyright Year	2014
Abstract	A trace element (TE) supplementation strategy previously shown to be effective in mesophilic conditions was tested for thermophilic digestion of source segregated domestic food waste.Inoculum from a mesophilic anaerobic digester treating municipal wastewater biosolids was successfully acclimated to thermophilic temperature (55 °C) with food waste as a substrate. Four laboratory-scale digesters were maintained at a loading of 2 g VS l$^{−1}$ day$^{−1}$ with one pair receiving TE supplementation. Two more pairs of digesters were incrementally loaded to 3 and 4 g VS l$^{−1}$ day$^{−1}$, respectively, and also received TE.All digesters performed well for the first 3–4 months of operation, but volatile fatty acid (VFA) concentrations in those without TE showed no recovery from an initial small accumulation. On continued operation, VFA concentrations increased in all digesters, especially those at higher loading rates or without TE supplementation, reaching >30 g l$^{−1}$. Under these meta-stable conditions, a deliberate disturbance to daily feeding (cessation then resumption) led to acetic acid accumulation, a fall in pH and a sharp increase in the ratio of partial to intermediate alkalinity. Increases in VFA corresponded to an increasing total ammonia nitrogen concentration which appeared to become inhibitory at ~2,500 mg N l$^{−1}$.While TE supplementation delayed the onset and reduced the rate of VFA accumulation, it was unable to sustain stable digestion of this substrate in thermophilic conditions.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	18772641
Journal	Waste and Biomass Valorization
Volume Number	6
Issue Number	1
e-ISSN	1877265X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-11-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Volatile fatty acids Food waste Thermophilic Ammonia Trace elements Engineering Environment Renewable and Green Energy Industrial Pollution Prevention Waste Management/Waste Technology Environmental Engineering/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal Environmental Engineering Renewable Energy, Sustainability and the Environment

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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