Enhanced degradation of phenol by <Emphasis Type="Italic">Pseudomonas</Emphasis> sp. CP4 entrapped in agar and calcium alginate beads in batch and continuous processes |
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Authors: | P?Y?Aneez Ahamad Email author" target="_blank">A?A?Mohammad KunhiEmail author |
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Institution: | (1) Department of Food Microbiology, Central Food Technological Research Institute, Mysore, 570 013, India;(2) Present address: Central Food Laboratory, Supreme Council of Health, P. O. Box 20426, Doha, Qatar; |
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Abstract: | Phenol is one of the major toxic pollutants in the wastes generated by a number of industries and needs to be eliminated before
their discharge. Although microbial degradation is a preferred method of waste treatment for phenol removal, the general inability
of the degrading strains to tolerate higher substrate concentrations has been a bottleneck. Immobilization of the microorganism
in suitable matrices has been shown to circumvent this problem to some extent. In this study, cells of Pseudomonas sp. CP4, a laboratory isolate that degrades phenol, cresols, and other aromatics, were immobilized by entrapment in Ca-alginate
and agar gel beads, separately and their performance in a fluidized bed bioreactor was compared. In batch runs, with an aeration
rate of 1 vol−1 vol−1 min−1, at 30°C and pH 7.0 ± 0.2, agar-encapsulated cells degraded up to 3000 mg l−1 of phenol as compared to 1500 mg l−1 by Ca-alginate-entrapped cells whereas free cells could tolerate only 1000 mg l−1. In a continuous process with Ca-alginate entrapped cells a degradation rate of 200 mg phenol l−1 h−1 was obtained while agar-entrapped cells were far superior and could withstand and degrade up to 4000 mg phenol l−1 in the feed with a maximum degradation rate of 400 mg phenol l−1 h−1. The results indicate a clear possibility of development of an efficient treatment technology for phenol containing waste
waters with the agar-entrapped bacterial strain, Pseudomonas sp. CP4. |
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