Journal
BIORESOURCE TECHNOLOGY
Volume 207, Issue -, Pages 440-445Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.02.063
Keywords
Acidogenic fermentation; Denitrification carbon source; Food waste leachate; Response surface analysis; Volatile fatty acids
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [2014R1A1A1002329]
- Ministry of Education [2013R1A1A2062963]
- Ulsan Green Environment Center (UGEC), Korea
- National Research Foundation of Korea [2014R1A1A1002329] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigated the simultaneous effects of hydraulic retention time (HRT) and pH on the continuous production of VFAs from food waste leachate using response surface analysis. The response surface approximations (R-2 = 0.895, p < 0.05) revealed that pH has a dominant effect on the specific VFA production (PTVFA) within the explored space (1-4-day HRT, pH 4.5-6.5). The estimated maximum PTVFA was 0.26 g total VFAs/g CODf at 2.14-day HRT and pH 6.44, and the approximation was experimentally validated by running triplicate reactors under the estimated optimum conditions. The mixture of the filtrates recovered from these reactors was tested as a denitrification carbon source and demonstrated superior performance in terms of reaction rate and lag length relative to other chemicals, including acetate and methanol. The overall results provide helpful information for better design and control of continuous fermentation for producing waste-derived VFAs, an alternative carbon source for denitrification. (C) 2016 Elsevier Ltd. All rights reserved.
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