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. 2014:2014:274620.
doi: 10.1155/2014/274620. Epub 2014 May 29.

Interaction of polybrominated diphenyl ethers and aerobic granular sludge: biosorption and microbial degradation

Shou-Qing Ni  1 , Qingjie Cui  2 , Zhen Zheng  1
Affiliations

Interaction of polybrominated diphenyl ethers and aerobic granular sludge: biosorption and microbial degradation

Shou-Qing Ni et al. Biomed Res Int. 2014.

Abstract

As a new category of persistent organic pollutants, polybrominated diphenyl ethers (PBDEs) have become ubiquitous global environmental contaminants. No literature is available on the aerobic biotransformation of decabromodiphenyl ether (BDE-209). Herein, we investigated the interaction of PBDEs with aerobic granular sludge. The results show that the removal of BDE-209 from wastewater is mainly via biosorption onto aerobic granular sludge. The uptake capacity increased when temperature, contact time, and sludge dosage increased or solution pH dropped. Ionic strength had a negative influence on BDE-209 adsorption. The modified pseudo first-order kinetic model was appropriate to describe the adsorption kinetics. Microbial debromination of BDE-209 did not occur during the first 30 days of operation. Further study found that aerobic microbial degradation of 4,4(')-dibromodiphenyl ether happened with the production of lower BDE congeners.

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Figures

Figure 1
Figure 1
Granule size distribution and cumulative frequency (◆) of aerobic granules in the reactor.
Figure 2
Figure 2
(a) Effect of contact time and initial BDE-209 concentrations on bioremoval of BDE-209 by aerobic granules. (b) Effect of different granular sludge dosages on biosorption process.
Figure 3
Figure 3
(a) Effect of initial solution pH on bioremoval of BDE-209 by aerobic granules. (b) Effect of different temperatures on bioremoval of BDE-209 by aerobic granules.
Figure 4
Figure 4
Kinetics plot for removal of BDE-209. (a) Pseudo first-order model, (b) modified first-order model, (c) pseudo second-order model, and (d) intraparticle kinetic model.
Figure 5
Figure 5
The plot of relationship between predicted adsorption quantity values and experimental values.
Figure 6
Figure 6
FTIR spectra of pristine (a) and BDE-209 treated (b) aerobic granules.
Figure 7
Figure 7
Microbial degradation of BDE-15 with the production of BDE-3 and DE.
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