Journal
BIORESOURCE TECHNOLOGY
Volume 125, Issue -, Pages 188-192Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.08.091
Keywords
Sodium toxicity; Grass leaves; Thermophilic anaerobic digestion; Start-up; Betaine
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Sodium toxicity is a common problem causing inhibition of anaerobic digestion, and digesters treating highly concentrated wastes, such as food and municipal solid waste, and concentrated animal manure, are likely to suffer from partial or complete inhibition of methane-producing consortia, including methanogens. When grass clippings were added at the onset of anaerobic digestion of acetate containing a sodium concentration of 7.8 g Na+/L, a total methane production about 8 L/L was obtained, whereas no methane was produced in the absence of grass leaves. In an attempt to narrow down which components of grass leaves caused decrease of sodium toxicity, different hypotheses were tested. Results revealed that betaine could be a significant compound in grass leaves causing reduction to sodium inhibition. (C) 2012 Elsevier Ltd. All rights reserved.
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