Biodegradation potential and bacterial diversity of a petrochemical wastewater treatment plant in Iran

• Published in: Bioresource technology Vol. 99; no. 14; pp. 6127 - 6133
• Main Authors: Shokrollahzadeh, S., Azizmohseni, F., Golmohammad, F., Shokouhi, H., Khademhaghighat, F.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2008; [New York, NY]: Elsevier Ltd; Elsevier
• Subjects: Acidovorax; Activated sludge; Applied sciences; Bacteria - classification; Bacteria - isolation & purification; Bacterial diversity; Biodegradation; Biological and medical sciences; Biological treatment; Biological treatment of sewage sludges and wastes; Biotechnology; Chromatography, Gas; Environment and pollution; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Gas Chromatography-Mass Spectrometry; Industrial applications and implications. Economical aspects; Industrial Waste; Iran; Petrochemical wastewater; Pollution; Sewage; Species Specificity; Wastewaters; Water Microbiology; Water Pollutants; Water treatment and pollution; Iran; Asia; Middle east; Biodegradation; Activated sludge; Biological treatment; Bacterial diversity; Petrochemical wastewater; Bacteria; Biodiversity; Sewage treatment plant; Waste water; Petrochemical product
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2007.12.034

An activated sludge treatment was evaluated for its effectiveness in cleaning up a petrochemical wastewater in Iran. For assessing biodegradation potential of activated sludge, seven characteristics of wastewater (temperature, pH, dissolved oxygen, chemical oxygen demand, concentrations of ethylene dichloride, vinyl chloride, and total hydrocarbons) were monitored during six months. It was shown that dominant pollutants in order of magnitude were normal-alkanes (C 10–C 21), aromatics, and polycyclic hydrocarbons. The activated sludge treatment revealed maximum reduction of 89%, 99%, 92%, and 80% in COD, ethylene dichloride, vinyl chloride and total hydrocarbons concentrations, respectively. Preliminary screening of culturable petrochemical-degrading microorganisms of the activated sludge resulted in the collection of 67 bacterial and one mold species. Bacterial strains mainly belonged to Pseudomonas, Flavobacterium, Comamonas, Cytophaga, Acidovorax, Sphingomonas, Bacillus and Acinetobacter genera. The isolated mold was identified as Trichoderma sp.