Influence of Physical Factors on Trichloroethylene Evaporation from Surface Water

Pant, Prabhakar; Allen, Marshall; Cai, Yong; Jayachandran, Krishnaswamy; Chen, Yin

Influence of Physical Factors on Trichloroethylene Evaporation from Surface Water

2007

Pant, Prabhakar | Allen, Marshall | Cai, Yong | Jayachandran, Krishnaswamy | Chen, Yin

Evaporation of trichloroethylene (TCE) is a viable option in the remediation of TCE contaminated water. In this study, laboratory batch experiments were conducted to understand the evaporation kinetics of TCE in surface water, with further extension of this knowledge to field application. Experiments were set up for 15, 30, 60, and 90 min time intervals in open glass containers with initial concentration of 10 mgl-¹ TCE in 100 ml water. The containers were either exposed to wind or were placed on an orbital shaker to produce constant water motion. A reference study carried out in absence of wind and water-motion showed much slower rate of TCE evaporation, compared to other studies done with wind or orbital shaker. Experiments with water turbulence at 150 rpm yielded a higher volatilization coefficient, Kv = 4.36 h-¹ for TCE. The wind at a flow rate of 0.7 m/s also gave rise to 2.24 h-¹ coefficient for TCE evaporation. The volatilization coefficient for the reference study yielded a smaller value of 0.23 h-¹, with corresponding half-life of 3 h, indicating the importance of wind and water motion in TCE evaporation. Experiments conducted at 150rpm and 0.7 m/s wind velocity showed consistent evaporation trend, and were in better agreement with the extrapolated rate of evaporation obtained through the first order rate equation.

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