Journal of Food, Agriculture and Environment

Oily compounds removal in wastewater treatment system of Pars oil refinery to improve its efficiency in a lab scale pilot

Author(s):

N. Otadi ^1*, A. H. Hassani ¹, A. H. Javid ¹, F. F. Khiabani ²

Recieved Date: 2010-08-28, Accepted Date: 2011-01-10

Abstract:

The aim of this research was inspecting the efficiency of physicochemical and biological processes with the active sludge method in the crude (raw) waste water of the Pars Oil Refinery Company. This research was done from 26^th January 2007 and continued until 27^th May 2007. The main operation in Pars oil refinery is to produce lubricants. This research tries to examine and evaluate the performance of treatment system at the refinery to decrease microorganisms in the industrial wastewater in a laboratory scale pilot. The pilot has two sections; physicochemical section, including dissolved air flotation system, and biological section, including wastewater and clarifier. This investigation was carried out on a 10-litre dissolved air flotation reactor and an active sludge reactor in a laboratory scale. The volume of the aerireactor (aeration reactor) was 10 litres, and the volume of the secondary sediment was 3.5 litres. The waste water of the refinery was used as inlet flow of pilot and necessary sludge was obtained at first from the Shahrak Ekbatan waste water treatment system. After analyzing the test results, it was concluded that the average percentages of excluding oil, chemical oxygen demand and biological oxygen demand were 29.7, 49 and 27.8, respectively. This indicates the effective role of physical treatment in decreasing oily emulsion material that would result in decreasing organic density in untreated wastewater. In biological system, the efficiency of excluding chemical oxygen demand and biological oxygen demand is 73.4 and 84.7, respectively. This confirms high efficiency of this unit. The samples taken from entering (influent) and exiting (effluent) wastewater of both units were tested. Standard methods were applied to determine the considered physical and chemical parameters.

Keywords:

Activated sludge, aerireactor, dissolved air flotation, oil refinery, waste water, treatment system, microorganisms, clarifier, chemical oxygen demand, biological oxygen demand

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 1
Category: Environment
Pages: 725-729

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