Effect of varying current on Pseudomonas aeruginosa degradation of naphthalene

Abstract

Polycyclic aromatic hydrocarbons are recognized as pollutants with carcinogenic, teratogenic, and mutagenic properties. Polycyclic aromatic hydrocarbons have therefore become priority pollutants that have attracted researchers' attention to developing remediation strategies. Numerous approaches, including physical, chemical, and biological strategies have been employed. But most of the techniques are associated with complexity issues, high cost and lack of scientific acceptance. Bioremediation making use of bacteria and fungi has also been researched extensively because of its cost effectiveness and environmental compatibility. But bioremediation of polycyclic aromatic hydrocarbons is associated with inefficiencies related to slow processes because of the recalcitrant, hydrophobic, and lipophilic properties of petroleum hydrocarbons. In this research, the possibility of enhancing the removal of naphthalene from contaminated water by the application of current was studied. The current of 1 A and 2 A was applied in an electrochemical cell inoculated with Pseudomonas aeruginosa. Total carbon removal was 87.33 %, 90.14 % and 80 % for 1 A, 2 A and when only biodegradation (0 A) was used respectively. The results showed that the application of current can enhance the degradation of naphthalene if the electrolytic current is not too high to affect cell membranes of the bacteria.