Phenol Biodegradation by Three Bacterial Strains Stimulated by Constant Electric Field

Abstract

Objective: The aim of the present study is to compare phenol biodegradation activity of bacteria from the strains Xanthobacter autotrophicus GJ 10, Pseudomonas denitrificans and Pseudomonas putida enhanced by constant electric field in a potentiostatic mode by free cultures and immobilized cells on granulated activated carbon.   Theoretical Framework: The work is based on the concept of biodegradation in constant electric field due to the enhanced removal of intermediate inhibitors produced from phenol. These intermediate may affect slightly microbial growth but the biodegradation capacity is enhanced.   Method: The methodology adopted for this research comprises bioelectrochemical oxidative microbial biodegradation of phenol at constant anode potential.   Results and Discussion: The obtained results revealed the positive effect of the electric field on the phenol biodegradation rate for all of the considered strains. There is certain anode potential at which the biodegradation rate is strongly affected for each strain.   Research Implications: The research have both practical and theoretical implications. The practical importance consists in the enhanced biodegradation of severe pollutant as phenol is. The theoretical importance is within the specific impact of constant electric field on the enzyme activities in the studied strains.   Originality/Value: This study contributes to the literature by the innovative approach and the practical aspects. The relevance and value of this research are demosntated by enhancement of phenol biodegradation in wastewater and water ponds.