Degradation of Trace Organic Contaminants by a Membrane Distillation—Enzymatic Bioreactor
AbstractA high retention enzymatic bioreactor was developed by coupling membrane distillation with an enzymatic bioreactor (MD-EMBR) to investigate the degradation of 13 phenolic and 17 non-phenolic trace organic contaminants (TrOCs). TrOCs were effectively retained (90–99%) by the MD membrane. Furthermore, significant laccase-catalyzed degradation (80–99%) was achieved for 10 phenolic and 3 non-phenolic TrOCs that contain strong electron donating functional groups. For the remaining TrOCs, enzymatic degradation ranged from 40 to 65%. This is still higher than those reported for enzymatic bioreactors equipped with ultrafiltration membranes, which retained laccase but not the TrOCs. Addition of three redox-mediators, namely syringaldehyde (SA), violuric acid (VA) and 1-hydroxybenzotriazole (HBT), in the MD-EMBR significantly broadened the spectrum of efficiently degraded TrOCs. Among the tested redox-mediators, VA (0.5 mM) was the most efficient and versatile mediator for enhanced TrOC degradation. The final effluent (i.e., membrane permeate) toxicity was below the detection limit, although there was a mediator-specific increase in toxicity of the bioreactor media. View Full-Text
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Asif, M.B.; Hai, F.I.; Kang, J.; Van de Merwe, J.P.; Leusch, F.D.L.; Yamamoto, K.; Price, W.E.; Nghiem, L.D. Degradation of Trace Organic Contaminants by a Membrane Distillation—Enzymatic Bioreactor. Appl. Sci. 2017, 7, 879.
Asif MB, Hai FI, Kang J, Van de Merwe JP, Leusch FDL, Yamamoto K, Price WE, Nghiem LD. Degradation of Trace Organic Contaminants by a Membrane Distillation—Enzymatic Bioreactor. Applied Sciences. 2017; 7(9):879.Chicago/Turabian Style
Asif, Muhammad B.; Hai, Faisal I.; Kang, Jinguo; Van de Merwe, Jason P.; Leusch, Frederic D.L.; Yamamoto, Kazuo; Price, William E.; Nghiem, Long D. 2017. "Degradation of Trace Organic Contaminants by a Membrane Distillation—Enzymatic Bioreactor." Appl. Sci. 7, no. 9: 879.
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