Response of phenol degrading pseudomonas pictorum to changing loads of phenolic compounds
Titel:
Response of phenol degrading pseudomonas pictorum to changing loads of phenolic compounds
Auteur:
Chitra, S. Chandrakasan, Gowri
Verschenen in:
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
Paginering:
Jaargang 31 (1996) nr. 3 pagina's 599-619
Jaar:
1996-03
Inhoud:
Aromatic compounds exist in a variety of biogenic products, which are released into the environment. Toxic and hazardous chemicals like pesticides used in agriculture or those derived from industrial processes find their way into a variety of environments. Alterations in chemical structure modify the susceptibility of organic compounds to biodegradation. Phenol and substituted phenols are present in the wastewater arising from number of industries. Therefore, a detailed study was carriedout to determine the growth and tolerance limit of phenol degrading P.pictorum towards substituted phenols. In addition, the ability of P.pictorum to degrade various concentrations of other phenolic compounds was also investigated. The nature of the substituent as well as the position of the substituent in the benzene ring, in relation to phenolic -OH group exerted a greater influence in deciding the degradative ability. 4-nitrophenol showed less growth compared to chlorophenols due to resonance effect of -NO2, which decreases induction of phenol hydroxylase. In the case of chlorophenols, the order of degradability was found to be 4-CP > 2-CP > 3-CP. Presence of more than one substituent in the benzene ring exerts steric effect, there by influencing phenol degradation. In the case of, 2-carboxy 4-sulphonyl phenol, the rate of growth was much less compared to phenol, there by reducing phenol degradation.
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