Enhancement with Carbon Nanotube Barrier on 1,2-Dichlorobenzene Removal from Soil by Surfactant-Assisted Electrokinetic (SAEK) Process – The Effect of Processing Fluid

Abstract

A surfactant assisted electrokinetic remediation (SAEK) process coupled with CNT barrier has been investigated for 1,2 DCB removal under potential gradient of 2.0 V/cm. A better removal of 1,2 DCB up to 75.5% was achieved in EK/CNT system with SDS as processing fluid. Lower removal was found in system with PANNOX 110, which might be due to low affinity of 1,2 DCB in PANNOX 110 micelle. Removal of 1,2 DCB in EK/CNT system was mainly contributed by surface sorption on CNT rather than by EK process. Among the electrical removal mechanisms, electrophoresis became more critical with the surfactant as processing fluid.

Keywords:

• Carbon nanotube
• dichlorobenzene
• electrokinetic
• permeable barrier
• soil remediation
• surfactant

ACKNOWLEDGEMENTS

This research was partly funded by the National Science Council of Taiwan, Grant # NSC95-2211-E-390-012. The authors were grateful to the reviewers for their valuable comments.

Notes

^a Data were provided by manufacturers.

^b It was purified with 3 M HNO₃ solution at 120°C for 2 hours.

1. All experiments were conducted under potential gradient of 2 V/cm for 5 day.

2. Other than PRB medium mentioned above, 10 g of Ottwa sand was also added into PRB layer.

^a  = (4) ÷ [(4)+(5)].

^b  = (5) ÷ [(4)+(5)].

(6) = (1)−[(3)+(4)+(5)].

(7) = (6) ÷ (2).

(8) = [(4)+(5)] ÷ [(1)−(3)].

(9) = (6) ÷ [(1)−(3)].