Vinyl Chloride Biodegradation with Methanotrophic Attached FilmsJournal of Environmental Engineering
AbstractMethanotrophic degradation of vinyl chloride (VC) is investigated using a laboratory-scale methanotrophic attached-film expanded-bed (MAFEB) bioreactor. This study provides a basis for applying a microbial cometabolizing reaction to practical treatment of toxic chlorinated compounds. The MAFEB reactor was operated at 20°C with influent VC concentrations ranging from 1,800 to 9,600 µg/L and bed hydraulic retention times ranging from 3.7 to 7.6 h. VC effluent concentrations during steady continuous operation ranged from 3 to 140 µg/L, with most values less than 26 µg/L, resulting in removal efficiencies of 96.3% to 99.8%. The maximum continuous-flow VC degradation rate observed at 20°C was 2.5 mg VC per gram volatile solids (VS) per day [2.5 mg VC/(g VS d)] or 30 mg VC per liter expanded bed per day 30 mg VC/Leb d), under substrate-limited conditions. During semibatch runs at 35°C, vinyl chloride degradation rates up to 60 mg VC/ (g VS d) or 1 g/(Leb d) were observed. Degradation rates increased with temperature between 20°C and 35°C, approximately doubling every 10°C. Dissolved methane concentrations above 0.5 mg/L inhibited VC degradation, with no VC degradation observed with 8 mg/L dissolved methane. The methane consumed during VC degradation was about 40 g CH4/g VC. Toxic effects were observed after prolonged exposure of the methanotrophic culture to high concentrations of VC.
Copyright1993 American Society of Civil Engineers.
Citation InformationYarrow M. Nelson and William J. Jewell. "Vinyl Chloride Biodegradation with Methanotrophic Attached Films" Journal of Environmental Engineering Vol. 119 Iss. 5 (1993) p. 890 - 907
Available at: http://works.bepress.com/ynelson/24/