TY - JOUR
T1 - Chitin and corncobs as electron donor sources for the reductive dechlorination of tetrachloroethene
AU - Brennan, Rachel A.
AU - Sanford, Robert A.
AU - Werth, Charles J.
N1 - Funding Information:
This research was performed with the support of a National Science Foundation Small Business Innovative Research (SBIR) Grant (Award no. DMI—0109868). The support of an NSF Graduate Research Fellowship and an Environmental Protection Agency STAR Fellowship for R.A. Brennan at the University of Illinois at Urbana-Champaign are also gratefully acknowledged. Frank Löffler of Georgia Institute of Technology is thanked for his donation of Desulfuromonas michiganensis strain BB1, and Kent Sorenson, Jr, now of Camp Dresser & McKee, is thanked for his many helpful discussions.
PY - 2006/6
Y1 - 2006/6
N2 - Chitin, corncobs, and a mixture of chitin and corncobs were tested as potential electron donor sources for stimulating the reductive dechlorination of tetrachloroethene (PCE). Semi-batch, sand-packed columns were used to evaluate the donors with aerobic and anaerobic groundwaters containing varying degrees of alkalinity. In all experiments, acetate and butyrate were the dominant fatty acids produced, although propionate, valerate, formate, and succinate were also detected. From a multivariable regression analysis on the data, the presence of chitin, limestone, and dechlorinating culture inoculum were determined to be the most positive predictors of dechlorination activity. Chitin fermentation products supported the degradation of PCE to trichloroethene (TCE), cis-1,2-dichloroethene (DCE), and vinyl chloride (VC), even in columns containing PCE DNAPL, whereas dechlorination activity was not observed in any of the columns containing corncobs alone. The longevity and efficiency of chitin as an electron donor source demonstrates its potential usefulness for passive, in situ field applications.
AB - Chitin, corncobs, and a mixture of chitin and corncobs were tested as potential electron donor sources for stimulating the reductive dechlorination of tetrachloroethene (PCE). Semi-batch, sand-packed columns were used to evaluate the donors with aerobic and anaerobic groundwaters containing varying degrees of alkalinity. In all experiments, acetate and butyrate were the dominant fatty acids produced, although propionate, valerate, formate, and succinate were also detected. From a multivariable regression analysis on the data, the presence of chitin, limestone, and dechlorinating culture inoculum were determined to be the most positive predictors of dechlorination activity. Chitin fermentation products supported the degradation of PCE to trichloroethene (TCE), cis-1,2-dichloroethene (DCE), and vinyl chloride (VC), even in columns containing PCE DNAPL, whereas dechlorination activity was not observed in any of the columns containing corncobs alone. The longevity and efficiency of chitin as an electron donor source demonstrates its potential usefulness for passive, in situ field applications.
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U2 - 10.1016/j.watres.2006.04.011
DO - 10.1016/j.watres.2006.04.011
M3 - Article
C2 - 16725176
AN - SCOPUS:33744905840
SN - 0043-1354
VL - 40
SP - 2125
EP - 2134
JO - Water Research
JF - Water Research
IS - 11
ER -