This study presents the effect of natural organic matter (NOM) on the reductive dechlorination of PCE by nZVI in the presence of vitamin B12. NOM and vitamin B12 occurs naturally in soil and could affect the reductive dechlorination of chlorinated compounds by nZVI. Characterization study on the interaction between nZVI and vitamin B12 for the degradation of PCE showed enhanced dechlorination kinetics of PCE. Removal of PCE by nZVI-Vitamin B12 was 78% in 6 hours at pH 8.17. The dechlorination kinetic of PCE by the interaction was 30 times faster than that of nZVI (0.05g) alone. The predominant cobalt specie under the reaction condition was Co (II) (vitamin B12r). The observed reduction kinetic of PCE by nZVI-vitamin B12 decreased by 27% in the presence of NOM (humic acid, 20mg/L) due probably to its adsorption on the nZVI surfaces. The experimental results showed that the reductive dechlorination of chlorinated compounds could be inhibited by NOM in natural and engineered systems.

Inhibition effect of natural organic matter on the reductive dechlorination of PCE by nZVI in the presence of vitamin B<sub>12</sub>

239th National Meeting (2010)

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Inhibition effect of natural organic matter on the reductive dechlorination of PCE by nZVI in the presence of vitamin B12

Inhibition effect of natural organic matter on the reductive dechlorination of PCE by nZVI in the presence of vitamin B₁₂