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Waste Management & Research
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Synergism effects of phenol-degrading yeast and ammonia-oxidizing bacteria for nitrification in coke wastewater of Esfahan Steel Company

Hossein Ghanavati

Department of Biology, Faculty of Science, Isfahan University, Isfahan, Iran, ghanavatih{at}yahoo.com

Giti Emtiazi

Department of Biology, Faculty of Science, Isfahan University, Isfahan, Iran

Mehdi Hassanshahian

Department of Biology, Faculty of Science, Isfahan University, Isfahan, Iran

Ammonia-oxidizing bacteria and phenol-degrading yeast were isolated in order to study the synergism effects of phenol-degrading yeast and ammonia-oxidizing bacteria for enhancing the nitrification in coke wastewater from the Isfahan Steel Company. The influent and effluent samples with ~ 600—1200 mg L— 1 ammonium and 550—2350 mg L—1 phenol were collected aseptically in sterile flasks. The biodegradation of phenol and nitrification were studied with different treatments. The results showed that addition of Na2CO3 and autotrophic bacteria to wastewater increased the ammonium removal by 100%. Furthermore, the synergism effects of phenol-degrader yeast and autotrophic bacteria reduced the time for ammonium removal.

Key Words: Nitrification • ammonia-oxidizing bacteria • phenol-degrader yeast • coke wastewater • simultaneous removal of ammonia and phenol • wmr 1108—3

Waste Management & Research, Vol. 26, No. 2, 203-208 (2008)
DOI: 10.1177/0734242X07079874
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