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Title: Continuous medium chain carboxylic acids production from excess sludge by granular chain-elongation process
Authors: Wu, Qinglian
Feng, Xiaochi
Chen, Ying
Liu, Min
Bao, Xian
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Wu, Q., Feng, X., Chen, Y., Liu, M. & Bao, X. (2021). Continuous medium chain carboxylic acids production from excess sludge by granular chain-elongation process. Journal of Hazardous Materials, 402, 123471-.
Journal: Journal of Hazardous Materials
Abstract: Short chain carboxylic acids (SCCAs) production is one of the primary ways to recycle excess sludge (ES). However, the high cost for the SCCAs separation/extraction due to its complete miscibility in water hinders the practical application of SCCAs and the popularization of this recycling way. To overcome this barrier, this study performed an emerging chain elongation (CE) technology to upgrade the SCCAs-rich sludge fermentation broth into the highly hydrophobic medium chain carboxylic acids (MCCAs). In a continuous expanded granule sludge bed (EGSB) reactor, a maximal MCCAs yield of 67.39 % and the corresponding concentration of 9.80 g COD/L (224.97 mM C/L) were achieved. By supplying CO2 at a loading rate of 2 [Formula: see text] to lower the hydrogen partial pressure, the ethanol utilization rate and the resulting MCCAs yield were further improved. In addition, three branched-MCCAs including iso-caproate, iso-heptylate, and iso-caprylate were obtained the first time from waste biomass with the average proportions of 6.17 %, 3.65 %, and 0.8 %, respectively. The branched-MCCAs came from the CE of branched-SCCAs. The granule sludges performing CE were mainly consisted of rod-shaped cells, and dominated by Clostridium sensu stricto and Clostridium IV. This study is expected to lay a foundation for recycling ES to MCCAs.
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2020.123471
Schools: School of Civil and Environmental Engineering 
Rights: © 2020 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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