title: Hexachlorobenzene dechlorination by indigenous sediment microorganisms.
abstract: Indigenous microbes from the sediments, whether contaminated with hexachlorobenzene (HCB) or not, could dechlorinate HCB effectively without any acclimation and supplemental nourishment. Temperature seriously affected the HCB-dechlorination: within the measured 15-45 degrees C span, the optimum range was between 30 and 35 degrees C. Sulfate-reducing bacteria (SRB), denitrifiers, and acetogens might not be directly involved in the HCB dechlorination. However, the SRB retarded subsequent dechlorination of pentachlorobenzene to tetra- and trichlorobenzenes. Some vancomycin-resistant gram-positive bacteria and methanogens were most likely to be the HCB-dechlorinators. The dechlorination followed the Michaelis-Menten behavior with the k'(m) and K(HCB) between 0.45-0.73 mg L(-1)day(-1) and 3.2-17.2 mg L(-1), respectively. These findings suggest a potential HCB treatment and cleanup for wastewater and contaminated site.
authors.affiliation: Department of Environmental Resources and Management, Chia-Nan University of Pharmacy and Science, Tainan 71710, Taiwan, ROC.
authors.forename: I-Ming
authors.initials: IM
authors.lastname: Chen
authors.forename: Wanit
authors.initials: W
authors.lastname: Wanitchapichat
authors.forename: Teeranuch
authors.initials: T
authors.lastname: Jirakittayakorn
authors.forename: Sukanda
authors.initials: S
authors.lastname: Sanohniti
authors.forename: Wichidtra
authors.initials: W
authors.lastname: Sudjarid
authors.forename: Chalermraj
authors.initials: C
authors.lastname: Wantawin
authors.forename: Jarurat
authors.initials: J
authors.lastname: Voranisarakul
authors.forename: Jin
authors.initials: J
authors.lastname: Anotai
mesh_terms: D001673:Biodegradation, Environmental; D019015:Geologic Sediments / Q000382:microbiology*; D054879:Halogenation; D006581:Hexachlorobenzene / Q000378:metabolism*; D007700:Kinetics; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D006581:Hexachlorobenzene