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Water, Air, & Soil Pollution

, 229:288 | Cite as

Treatment of Waters Contaminated by Phenol and Cresols in Circulating Packed Bed Bioreactors—Biodegradation and Toxicity Evaluations

  • Yi Zhou
  • Mehdi Nemati
Article

Abstract

Biodegradation of phenol, o-cresol, and p-cresol was evaluated in continuous flow circulating packed bed bioreactors. Effect of loading rate on the removal rate of phenolic compounds was assessed by varying the influent concentration and flow rate. Regardless of the nature of phenolic compounds at a constant concentration, increase of loading rate caused the removal rate to pass through a maximum and then decline. Influent concentrations of 100 and 300 mg L−1 did not affect the removal rates of phenol and p-cresol, but higher rates were obtained at 500 mg L−1. With o-cresol, increase of influent concentration from 100 to 300 mg L−1 enhanced the removal rate but no further enhancement was observed at 500 mg L−1. The maximum removal rates for phenol, o-cresol, and p-cresol were 67.6–97.8, 38.7–73.8, and 77.2–107.2 mg L−1 h−1 at loading rates of 96.7–171.1, 61.6–163.9, and 87.4–183.9 mg L−1 h−1 (hydraulic residence time 2.9, 1.7–1.8, 1.2–2.8 h), respectively. Toxicity examination of untreated influents singled out phenol as the least toxic compound, while o-cresol and p-cresol showed similar toxicities. Treatment of influent containing 100 mg L−1 of phenolic compound led to the highest decrease in toxicity (> 93%) for all three compounds. With influent concentrations of 300 mg L−1 or higher, the decrease in toxicity of treated effluent was highest for phenol, followed by p-cresol, and then o-cresol. Finally, the observed patterns revealed that the toxicity of treated effluent was affected by the extent of biodegradation, as well as the toxic nature of phenolic compound under treatment.

Keywords

Phenol Cresols Biodegradation Circulating packed bed bioreactor Toxicity 

Notes

Acknowledgements

Provision of a scholarship from the China Scholarship Council to Yi Zhou is gratefully acknowledged.

Funding Information

This study was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) (Discovery Grants #261376-2013).

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.School of Environment and SustainabilityUniversity of SaskatchewanSaskatoonCanada
  2. 2.Department of Chemical and Biological EngineeringUniversity of SaskatchewanSaskatoonCanada

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