Chlorinated solvent degradation in groundwater by green rust-bone char composite: solute interactions and chlorinated ethylene competition
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Chlorinated solvent degradation in groundwater by green rust-bone char composite : solute interactions and chlorinated ethylene competition. / Ai, Jing; Tobler, Dominique J.; Duncan-Jones, Cecilie Gry; Manniche, Maria Eckardt; Andersson, Kirstine Evald; Hansen, Hans Christian B.
In: Environmental Science: Water Research & Technology, Vol. 7, No. 11, 2021, p. 2043-2053.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Chlorinated solvent degradation in groundwater by green rust-bone char composite
T2 - solute interactions and chlorinated ethylene competition
AU - Ai, Jing
AU - Tobler, Dominique J.
AU - Duncan-Jones, Cecilie Gry
AU - Manniche, Maria Eckardt
AU - Andersson, Kirstine Evald
AU - Hansen, Hans Christian B.
PY - 2021
Y1 - 2021
N2 - Biochar works as a green catalyst for the dechlorination of chlorinated ethylenes (CEs) by green rust (GR). Although the GR-biochar composite shows great potential for groundwater remediation, its performance under simulated field conditions has not been investigated. In this study, a composite of chloride GR and bone char (BC) was used to investigate the effect of groundwater solutes (Cl-, SO42-, HCO3-, and H4SiO4) and the co-existence of one or two CE(s) on GR-BC reactivity with CEs. Furthermore, a contaminant-free groundwater and five CE-contaminated groundwaters were collected to test the reactivity of the GR-BC composite under real groundwater conditions. Among all tested groundwater solutes, HCO3- affected CE dechlorination rates the most, exemplified by a 6.7-fold decrease in trichloroethylene (TCE) reduction rate constant, k(mass), to 0.16 L g(-1) h(-1) in the presence of 10 mM HCO3- solution when compared to the solute free experiment. Silicic acid led to a 1.7-fold decrease in k(mass) at concentrations of 0.5 and 1 mM and a 5.3-fold decrease at 2 mM. TCE reduction rate was also decreased by the co-existence of PCE (by a factor of 1.6), while cDCE had very little impact. Natural groundwater matrices led to up to 52-fold decrease in k(mass)(TCE), depending on the complexity and pollutant profile of the groundwater. However, relatively fast dechlorination with k(mass)(TCE) >= 0.021 L g(-1) h(-1) was seen in all tested CE-contaminated groundwaters where CE concentrations were comparable. For hard groundwaters, HCO3- is recognized as the main inhibitor for dechlorination, while the impact of the other tested solutes is minor. The study provides practical information for the application of the GR-BC composite for remediation of CE-contaminated groundwaters.
AB - Biochar works as a green catalyst for the dechlorination of chlorinated ethylenes (CEs) by green rust (GR). Although the GR-biochar composite shows great potential for groundwater remediation, its performance under simulated field conditions has not been investigated. In this study, a composite of chloride GR and bone char (BC) was used to investigate the effect of groundwater solutes (Cl-, SO42-, HCO3-, and H4SiO4) and the co-existence of one or two CE(s) on GR-BC reactivity with CEs. Furthermore, a contaminant-free groundwater and five CE-contaminated groundwaters were collected to test the reactivity of the GR-BC composite under real groundwater conditions. Among all tested groundwater solutes, HCO3- affected CE dechlorination rates the most, exemplified by a 6.7-fold decrease in trichloroethylene (TCE) reduction rate constant, k(mass), to 0.16 L g(-1) h(-1) in the presence of 10 mM HCO3- solution when compared to the solute free experiment. Silicic acid led to a 1.7-fold decrease in k(mass) at concentrations of 0.5 and 1 mM and a 5.3-fold decrease at 2 mM. TCE reduction rate was also decreased by the co-existence of PCE (by a factor of 1.6), while cDCE had very little impact. Natural groundwater matrices led to up to 52-fold decrease in k(mass)(TCE), depending on the complexity and pollutant profile of the groundwater. However, relatively fast dechlorination with k(mass)(TCE) >= 0.021 L g(-1) h(-1) was seen in all tested CE-contaminated groundwaters where CE concentrations were comparable. For hard groundwaters, HCO3- is recognized as the main inhibitor for dechlorination, while the impact of the other tested solutes is minor. The study provides practical information for the application of the GR-BC composite for remediation of CE-contaminated groundwaters.
KW - ZEROVALENT IRON NZVI
KW - ZERO-VALENT IRON
KW - REDUCTION
KW - WATER
KW - TRANSFORMATION
KW - PHOSPHATE
KW - COPRECIPITATION
KW - REACTIVITY
KW - CARBONATE
KW - GOETHITE
U2 - 10.1039/d1ew00484k
DO - 10.1039/d1ew00484k
M3 - Journal article
VL - 7
SP - 2043
EP - 2053
JO - Environmental Science: Water Research & Technology
JF - Environmental Science: Water Research & Technology
SN - 2053-1400
IS - 11
ER -
ID: 280286110