G. Jin et Aj. Englande, REDOX POTENTIAL AS A CONTROLLING FACTOR IN ENHANCING CARBON-TETRACHLORIDE BIODEGRADATION, Water science and technology, 34(10), 1996, pp. 59-66
Citations number
15
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Biodegradation of hazardous waste is often the most cost-effective tec
hnique suitable for purifying large quantities of polluted groundwater
and industrial effluents. In an effort of optimizing environmental co
nditions for microorganisms to degrade carbon tetracholoride, culture
redox potential (Eh) was demonstrated as having a critical role. The m
icroorganisms tested were isolated from contaminated field sites and i
ncluded Pseudomonas cepacia and Providencia stuartii. Ti(III) citrate
was used as a reducing agent to poise Ph at designed values. Over 99%
degradation of carbon tetrachloride was effected in 3 days at -250 mV
less than or equal to Eh less than or equal to -200 mV. Lesser rates w
ere observed at Eh greater than or equal to 0 mV. Kinetic analysis ind
icated that the overall degradation rate constant increased from 2.75x
10(-3) h(-1) to 4.75x10(-2) h(-1) by controlling Eh at about -200 mV c
ompared with Ph at greater than or equal to 0 mV. Results indicated th
at the implementation of critical redox potential may be effective in
optimizing CT biodegradation activity. Copyright (C) 1996 IAWQ.