No abstract

Biodegradation of decabrominated diphenyl ether in soil by white rot fungi under various experimental conditions was investigated in this study. It was found that BDE-209 in soil could be rapidly and efficiently degraded by white rot fungi, and the biodegradation fits the pseudo-first-order kinetics during a 15-day incubation period. The residues of BDE-209 in soil decreased with the increased amount of white rot fungi addition. It can be seen from the results that white rot fungi have a good degradation ability with one-step and two-step addition method. In native soil, the degradation of BDE-209 reached 52.65%, which was higher than that in sterilized soil. About 37.76Á53.74% of BDE-209 degradation was observed in different soil types after 15 days. In addition, it was confirmed in this study that the presence of Cu 2' , Cd 2' could enhance the remediation of soil contaminated with BDE-209, and the residues decreased by 69.20% and 54.65% for Cu 2' and Cd 2' treatment, respectively. However, the superior ability of white rot fungi to degrade BDE-209 was not obvious at low pollution level (B0.5 mg kg (1 ).

In this study, we illustrated enhanced biodegradation enzyme activity and the strains growth using the plants residues as carriers during the biodegradation of phenol in petrochemical wastewater. The three phenol-degrading strains named as A1, A2 and A3 were selected for an immobilized microorganism technique. A1, A2 and A3 were identified asPenicilliumoxalicum,Aspergillussp. andSphingobacteriumsp. using detailed morphological, biochemical and molecular characterization. The growth and degradation rate of phenol in wastewater by strains A1, A2 and A3 pre-grown in the agricultural residues (peanut shell) were higher than the free strains. Compared with the free strains,the enzyme activity of strains A1,A2 and A3, using the residues for pre-grown, increased 29.01 U/L, 30.30 U/L and 38.07 U/L, respectively. Hence, the immobilized microorganism technique is conducive to the phenol degradation.

Biodegradation of decabrominated diphenyl ether (BDE-209) in soil by white rot fungi under various experimental conditions was investigated in this study. It was found that BDE-209 in soil could be rapidly and efficiently degraded by white rot fungi, and the biodegradation fits the pseudo-first-order kinetics during a 15-day incubation period. The residues of BDE-209 in soil decreased with the increase of amount of white rot fungi addition. It can be seen from the results that, white rot fungi have good ability on degradation with one-step or two-step addition method. In native soil, the degradation of BDE-209 reached 52.65%, which was higher than that in sterilized soil. About 37.76-53.74% of BDE-209 was degraded in different soil types after 15 days. In addition, it was confirmed in this study that the presence of Cu2+, Cd2+could enhance the remediation of BDE-209 contaminated soil, and the residues decreased by 69.20% and 54.65% for Cu2+and Cd2+treatment, respectively. However, the superior ability of white rot fungi to degrade BDE-209 was not obvious at low pollution level (≤0.5 mg kg-1).