Abstract
Pseudomonas aeruginosa is a good environmental microorganism capable of degrading decabromodiphenyl ether (BDE‐209). This paper studied the effect of Cu2+ and humic acid (HA) extracted from e‐waste contaminated soils on biodegradation of BDE‐209 by P. aeruginosa. The adsorption isotherms of Cu2+ on HA, the crude enzyme activity, cell surface morphology, and biodegradation pathway were also investigated. The results showed that BDE‐209 biodegradation by P. aeruginosa was inhibited at Cu2+ concentrations above 5 mg L−1, but exhibited the best effect at the condition of 40 mg L−1 Cu2+ + 3 g L−1 HA. At the condition of 40 mg L−1 Cu2+ + 3 g L−1 HA, 97.35 ± 2.33% of the initial BDE‐209 was degraded after 5 days, debromination efficiency was 72.14 ± 1.89%, crude enzyme activity reached the maximum of 0.519 ± 0.022U g−1 protein, cell surface of P. aeruginosa was smooth with normal short‐rod shapes, and biodegradation pathway mainly include debromination, hydroxylation, and cleavage of the diphenyl ether bond. It was suggested that soil HA could eliminate the toxic effect of high Cu2+ concentrations and biodegradation of BDE‐209 was improved by synergistic effect of HA and Cu2+.
Highlights
The effect of copper ion and soil humic acid (HA) on biodegradation of BDE-209 by P. aeruginosa has never been reported
The main objective of the present work was to study the effect of Cu2+ and humic acid (HA) extracted from e-waste-contaminated soils on biodegradation of BDE-209 by P. aeruginosa, principally focusing on the degradation efficiency, debromination efficiency, crude enzyme activity, and possible biodegradation pathway
It is well known that Cu2+ is an important micronutrient for microorganism growth and metabolism
Summary
The effect of copper ion and soil HA on biodegradation of BDE-209 by P. aeruginosa has never been reported. The main objective of the present work was to study the effect of Cu2+ and HA extracted from e-waste-contaminated soils on biodegradation of BDE-209 by P. aeruginosa, principally focusing on the degradation efficiency, debromination efficiency, crude enzyme activity, and possible biodegradation pathway.
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