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Simultaneous removal of selenite and phenol from wastewater in an upflow fungal pellet bioreactor
Author(s) -
Werkneh Adhena A,
Rene Eldon R,
Lens Piet NL
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5452
Subject(s) - phenol , bioreactor , chemistry , selenium , wastewater , phanerochaete , nuclear chemistry , chromatography , biodegradation , pulp and paper industry , organic chemistry , environmental engineering , environmental science , engineering
BACKGROUND The simultaneous treatment of wastewater containing selenite and phenol in batch and continuous systems, inoculated with pellets of Phanerochaete chrysosporium , was evaluated in this study. RESULTS Synthetic oil refinery wastewater containing 15 mg L −1 selenite and 100–600 mg L −1 phenol was used in batch incubations for 5 days. Orange‐red colored pellets developed during selenite incubations in the presence of up to 400 mg L −1 of phenol, which confirms the formation of elemental selenium with removal efficiencies ranging from 57–78.5% and 75–90.8% for, respectively, phenol and selenite. Continuous experiments in two upflow fungal pelleted bioreactors (30 °C, pH 4.5, hydraulic retention time of 16.7 h) fed the synthetic oil refinery wastewater containing phenol or phenol with selenite were performed for 38 days. The maximum removal efficiency of phenol in the fungal bioreactor was 100% (up to day 26). CONCLUSION Selenite mass balance showed that the overall maximum removal efficiency of selenite in the presence of phenol was 67.3%. The critical phenol and selenite loading rates of the upflow bioreactors were ∼12 and 4.3 mg L −1 h −1 , respectively. © 2017 Society of Chemical Industry