TY - JOUR
T1 - Modeling the release and spreading of permanganate from aerated slow-release oxidants in a laboratory flow tank
AU - Kambhu, Ann
AU - Li, Yusong
AU - Gilmore, Troy
AU - Comfort, Steve
N1 - Funding Information:
Funding was provided, in part, from the National Institute of Environmental Health Sciences Superfund Research Program, STTR Phase II (Grant number: R41ES22530 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/2/5
Y1 - 2021/2/5
N2 - Aerated, slow-release oxidants are a relatively new technology for treating contaminated aquifers. A critical need for advancing this technology is developing a reliable method for predicting the radius of influence (ROI) around each drive point. In this work, we report a series of laboratory flow tank experiments and numerical modeling efforts designed to predict the release and spreading of permanganate from aerated oxidant candles (oxidant-wax composites). To mimic the design of the oxidant delivery system used in the field, a double screen was used in a series of flow tank experiments where the oxidant was placed inside the inner screen and air was bubbled upward in the gap between the screens. This airflow pattern creates an airlift pump that causes water and oxidant to be dispersed from the top of the outer screen and drawn in at the bottom. Using this design, we observed that permanganate spreading and ROI increased with aeration and decreased with advection. A coupled bubble flow and transport model was able to successfully reproduce observed results by mimicking the upward shape and spreading of permanganate under various aeration and advection rates.
AB - Aerated, slow-release oxidants are a relatively new technology for treating contaminated aquifers. A critical need for advancing this technology is developing a reliable method for predicting the radius of influence (ROI) around each drive point. In this work, we report a series of laboratory flow tank experiments and numerical modeling efforts designed to predict the release and spreading of permanganate from aerated oxidant candles (oxidant-wax composites). To mimic the design of the oxidant delivery system used in the field, a double screen was used in a series of flow tank experiments where the oxidant was placed inside the inner screen and air was bubbled upward in the gap between the screens. This airflow pattern creates an airlift pump that causes water and oxidant to be dispersed from the top of the outer screen and drawn in at the bottom. Using this design, we observed that permanganate spreading and ROI increased with aeration and decreased with advection. A coupled bubble flow and transport model was able to successfully reproduce observed results by mimicking the upward shape and spreading of permanganate under various aeration and advection rates.
KW - Airlift pump
KW - Modular oxidant delivery system
KW - Oxidant candles
KW - Oxidant cylinders
KW - Oxidant delivery device
KW - Slow-release oxidants
UR - http://www.scopus.com/inward/record.url?scp=85090408870&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85090408870&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.123719
DO - 10.1016/j.jhazmat.2020.123719
M3 - Article
C2 - 33264895
AN - SCOPUS:85090408870
SN - 0304-3894
VL - 403
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 123719
ER -