Investigating the inhibitory effect of cyanide, phenol and 4-nitrophenol on the activated sludge process employed for the treatment of petroleum wastewater

Investigating the inhibitory effect of cyanide, phenol and 4-nitrophenol on the activated sludge process employed for the treatment of petroleum wastewater

In this work, the inhibitory effect of cyanide, phenol and 4-nitrophenol on the activated sludge process was investigated. The inhibition of the aerobic oxidation of organic matter, nitrification and denitrification were examined in batch reactors by measuring the specific oxygen uptake rate (sOUR),...

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Bibliographic Details
Published in:Journal of environmental management Vol. 203; no. Pt 2; pp. 825 - 830
Main Authors: Inglezakis, V.J., Malamis, S., Omirkhan, A., Nauruzbayeva, J., Makhtayeva, Z., Seidakhmetov, T., Kudarova, A.
Format: Journal Article
Language:English
Published: England Elsevier Ltd 01-12-2017
Subjects:
Activated sludge
Bioreactors
Cyanide
Cyanides
Denitrification
Inhibition
Nitrification
Nitrogen
Nitrophenols
Oxygen uptake rate
Petroleum
Phenol
Phenols
Sewage
Waste Disposal, Fluid
Waste Water
Water Purification
Cyanide
Activated sludge
Phenol
Oxygen uptake rate
Nitrification
Denitrification
Inhibition
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Summary:In this work, the inhibitory effect of cyanide, phenol and 4-nitrophenol on the activated sludge process was investigated. The inhibition of the aerobic oxidation of organic matter, nitrification and denitrification were examined in batch reactors by measuring the specific oxygen uptake rate (sOUR), the specific ammonium uptake rate (sAUR) and the specific nitrogen uptake rate (sNUR) respectively. The tested cyanide, phenol and 4-nitrophenol concentrations were 0.2–1.7 mg/L, 4.8–73.1 mg/L and 8.2–73.0 mg/L respectively. Cyanide was highly toxic as it significantly (>50%) inhibited the activity of autotrophic biomass, heterotrophic biomass under aerobic conditions and denitrifiers even at relatively low concentrations (1.0–1.7 mgCN−/L). The determination of the half maximum inhibitory concentration (IC50) confirmed this, since for cyanide IC50 values were very low for the examined bioprocesses (<1.5 mg/L). On the other hand, the IC50 values for phenol and 4-nitrophenol were much higher (>25 mg/L) for the tested bioprocesses since appreciable concentrations were required to accomplish significant inhibition. The autotrophic bacteria were more sensitive to phenol than the aerobic heterotrophs. The denitrifiers were found to be very resistant to phenol. •Inhibitory effect of cyanide, phenol and 4-nitrophenol in activated sludge process.•Cyanide was highly toxic as it significantly inhibited sOUR, sAUR and sNUR.•sNUR was the least inhibited bioprocess for cyanide and phenol.•Lowest IC50 value for 4-nitrophenol was found for sNUR.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2016.08.066