LAPSE:2019.0929
Published Article
LAPSE:2019.0929
Enhanced Anaerobic Performances of Kitchen Wastes in a Semi-Continuous Reactor by EDTA Improving the Water-Soluble Fraction of Fe
Yali Liu, Xiaorong Kang, Han Cheng
August 8, 2019
The addition of Fe2+ is considered an effective method for increasing methane production, but the added Fe2+ may not be absorbed by anaerobic microorganisms due to complex chemical reactions. In this study, ethylenediaminetetraacetic acid (EDTA) was used as a ligand of Fe2+ (EDTA-Fe) to promote the dissolution of Fe, and the anaerobic performances of kitchen wastes (KWs) in a semi-continuous reactor were studied. The results indicated that the biogas yields and methane contents were enhanced to 594−613 mL·g−1VSadd·d−1 and 63.6−64.4% at an organic loading rate (OLR) of 2.5 gVSadd·L−1·d−1 due to EDTA-Fe addition. Simultaneously, the EDTA-Fe was more effective than Fe2+ in preventing the acidification of KWs with a high OLR (5.0 gVSadd·L−1·d−1). In addition, the sequential extraction results showed that the water-soluble fraction of Fe in the R3 (EDTA-Fe addition) was 1.49-fold of that in the R2 with Fe2+ addition. The contents of coenzymes F420 and F430 were also improved 1.09 and 1.11 times, respectively. Mechanism analysis confirmed that the EDTA enhanced methane production and operational stability by promoting the dissolution of Fe and maintaining a high content of water-soluble Fe.
Keywords
EDTA, Fe, kitchen wastes, methane, semi-continuous reactor
Subject
Suggested Citation
Liu Y, Kang X, Cheng H. Enhanced Anaerobic Performances of Kitchen Wastes in a Semi-Continuous Reactor by EDTA Improving the Water-Soluble Fraction of Fe. (2019). LAPSE:2019.0929
Author Affiliations
Liu Y: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China [ORCID]
Kang X: School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Cheng H: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
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Journal Name
Processes
Volume
7
Issue
6
Article Number
E351
Year
2019
Publication Date
2019-06-08
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr7060351, Publication Type: Journal Article
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LAPSE:2019.0929
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doi:10.3390/pr7060351
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Aug 8, 2019
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Aug 8, 2019
 
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Calvin Tsay
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