The potential for phytoremediation of MTBE

Ellen Rubin, Anu Ramaswami

    Research output: Contribution to journalArticlepeer-review

    54 Scopus citations

    Abstract

    This paper examines the potential for phytoremediation of MTBE, a gasoline additive that has become a prevalent and persistent groundwater pollutant, due to its' non-sorbing and non-reactive nature in water. A novel experimental design is developed to measure plant uptake and transpiration of MTBE from hydroponic systems, separating these processes from passive volatilization of the chemical. Plant uptake experiments indicate 30% reduction in MTBE mass in water over a 1-week period by small poplar saplings, at both high (1600ppb) and low (300ppb) MTBE concentrations. Active plant uptake of MTBE was approximately double that achieved by passive volatilization through a balsa wood control. MTBE was detected in biomass at the 100-ppb level, confirming passage of MTBE through the plant. A mass balance indicated that MTBE was largely untransformed during transport through the small poplar saplings to air. The high degree of MTBE removal achieved by small plants over a short period of time indicates great potential for successful phytoremediation of subsurface MTBE plumes using poplar trees. The fraction of MTBE removed from the hydroponic systems correlated well with volume of water transpired by the plants; the correlation enabled computation of the MTBE transpiration stream concentration factor of approximately 1, an important parameter for the design of engineered MTBE phytoremediation systems.

    Original languageEnglish (US)
    Pages (from-to)1348-1353
    Number of pages6
    JournalWater Research
    Volume35
    Issue number5
    DOIs
    StatePublished - 2001

    Bibliographical note

    Funding Information:
    This project was funded by a grant from the National Science Foundation 1998 POWRE program, award number 9806228.

    Keywords

    • Groundwater
    • MTBE
    • Phytoremediation
    • Poplar trees
    • Transpiration stream concentration factor (TSCF)

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