AI Article Synopsis
- Mixed-acid fermentation relies on carbon and nitrogen nutrients for cell growth and metabolism, impacting carboxylic acid yields.
- A study co-digested wastewater sludge with pretreated bagasse at different sludge proportions and temps of 55°C to explore how C/N ratios influence acid production.
- The best yields (0.36 g acids/g VS fed) occurred at C/N ratios between 13 to 25, with acetic and butyric acids being predominant, while other acids increased as sludge content rose, suggesting higher protein breakdown.
Article Abstract
In mixed-acid fermentation, carbon and nitrogen are critical nutrients for cell synthesis, growth, and metabolism. To study the effect of C/N ratio on the yield of carboxylic acids, wastewater sludge was co-digested with pretreated bagasse; the amount of sludge was varied from 0% to 100% (dry weight basis). Fermentation was performed at 55°C at a solids concentration of 50 g dry solids/L, and Iodoform was used to inhibit methane formation. It was observed that C/N ratio significantly affects yield, especially at extreme ratios. The highest carboxylic acid yield (0.36 g acids/g VS fed) was obtained for C/N ratios ranging from 13 to 25 g C/g N. C/N ratio also affected the composition profile of carboxylic acids. In all mixtures, acetic acid was the major fraction, followed by butyric acid. However, i-butyric, valeric acid, and i-valeric acid increased with increasing sludge content, which likely resulted from protein degradation.
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| http://dx.doi.org/10.1016/j.biortech.2012.02.081 | DOI Listing |
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