Microbial Activity Evolution during the Acclimation of a Mixed Culture to Phenol: Use of CO2 Evolution Rate as Indicator

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2049-2052 ◽  
Author(s):  
G. Buitrón ◽  
A. Koefoed ◽  
B. Capdeville
Keyword(s):  
Microbial Activity ◽  
Control Parameter ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Evolution Rate ◽  
Biodegradation Rate ◽  
Carbon Dioxide Evolution ◽  
Carbon Dioxide Evolution Rate ◽  
Infra Red ◽  
Negative Effect

The microbial activity during the aerobic acclimation of activated sludge to phenol was studied. Carbon dioxide evolution rate (CER), measured in a sequencing batch reactor coupled to an infra-red system, was utilized as the activity control parameter. It was found that CER is representative of the microbial metabolism. Moreover, it was observed that starvation periods during acclimation had a negative effect on biodegradation rate.

Improvement and Control of the Microbial Activity of a Mixed Population for Degradation of Xenobiotic Compounds

1994 ◽  
Vol 29 (7) ◽  
pp. 317-326 ◽  
Author(s):  
Germán Buitrón ◽  
Bernard Capdeville ◽  
Patrick Horny
Keyword(s):  
Microbial Activity ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Mixed Population ◽  
Specific Substrate ◽  
Reactor Operation ◽  
Carbon Dioxide Evolution ◽  
Carbon Dioxide Evolution Rate ◽  
Micro Organisms ◽  
And Control

A computer-aided sequencing batch reactor, CA-SBR, was used in order to monitor, improve and control the microbial activity for xenobiotics degradation. The control parameter for the reactor operation was the carbon dioxide evolution rate. Activated sludge was acclimated to 4-chlorophenol, 4CP, and was used as inoculum for the reactor. A specific substrate degradation rate, qm, of 116 mg 4CP/gMLSS-h was obtained for the best conditions using the CA-SBR. Whereas, with a 24-hour SBR cycle policy, qm was 20 mg 4CP/g MLSS-h. The ability of acclimated micro-organisms to degrade 4CP decreased as a consequence of starvation periods. Inductive enzyme activity decreased by as much as 80 % after 6 hours of starvation. Furthermore, a loss of 60 % in cell viability was found after 20 hours of starvation.

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