Treatment of Al-Muthanna Petroleum Refinery Wastewater by Electrocoagulation Using a Tubular batch Electrochemical Reactor

An electrocoagulation process has been used to eliminate the chemical oxygen demand (COD) from wastewaters discharged from the Al-Muthanna petroleum refinery plant. In this process, a circular aluminum bar was used as a sacrificial anode, and hallow cylinder made from stainless steel was used as a c...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-06, Vol.779 (1), p.12094
Main Authors: Naser, Ghazi F., Mohammed, Thamer J., Abbar, Ali H.
Format: Article
Language:English
Subjects:
Aluminum
aluminum anode
Chemical oxygen demand
Chemical reactors
COD removal
Current density
Discharge
Efficiency
Effluent standards
Electrochemistry
Electrocoagulation
Energy consumption
Ozone
Petroleum
Petroleum industry wastewaters
Petroleum refineries
Petroleum refinery wastewater
Petroleum refining
pH effects
Reactors
Refineries
Refinery wastes
Sacrificial anodes
Sodium chloride
Stainless steel
Stainless steels
Wastewater
Wastewater discharges
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Summary:An electrocoagulation process has been used to eliminate the chemical oxygen demand (COD) from wastewaters discharged from the Al-Muthanna petroleum refinery plant. In this process, a circular aluminum bar was used as a sacrificial anode, and hallow cylinder made from stainless steel was used as a cathode in a tubular batch electrochemical Reactor. Impacts of the operating factors like current density (5-25mAcm -2 ), NaCl addition at concentrations (0-2g/l), and pH at values (3-11) on the COD removal efficiency were studied. Results revealed that the increase in current density increases the COD removal efficiency, whereas an increase in NaCl concentration results in a decline in the COD removal efficiency. Using a pH value higher or lower than 7 causes a lowering of the COD removal efficiency. A current density of 15mA/cm 2 , NaCl concentration of 1g/l, and pH value of 7 were found to be the best operating conditions in which COD removal efficiency of 95.3% was achieved at a treatment time 45 minutes with an energy consumption of 27.78kWh/kg COD. Based on these conditions, a COD value of 20 ppm could be obtained, which is below the standard limit for discharging petroleum refinery effluents.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/779/1/012094