Document Type : Original Article
Authors
1
Chemistry Department, Faculty of Science (boys), Al-Azhar University, Cairo, Egypt.
2
Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt
3
Water Pollution Research Department, National Research Centre, El-Buhouth St., Dokki, Cairo; 12622, Egypt
4
Manager of Al-mlahia water treatment plant.GHWSCo,Tanta, Egypt
Abstract
Electrocoagulation/flotation (ECF) process is introducing electrical current into an aqueous media to destabilize dissolved or suspended contaminants. All the conventional and advanced treatment technologies aim to treat wastewater before discharging to the water systems. As an alternative to conventional methods for treating industrial and municipal waters, electrochemical methods have recently been investigated. This method minimizes using of chemicals was enhanced to pollutant removal, environmental impact and support sustainability goals, making them a compelling choice for wastewater management.
ECF unit electrodes were made of iron or aluminum arranged in monopolar connection, where wastewater was pumped through it. In this work the impact of operating parameters for ECF process was investigated such as types of electrodes material, pH, retention time and current density for the best removal of liquid waste pollutants as biochemical oxygen demand (BOD), Total suspended solids (TSS) and chemical oxygen demand (COD). Tanta's wastewater treatment plant provided wastewater samples. The results demonstrated that using Al electrodes which arranged in monopolar connection series to reduce the operation cost, the efficiencies of removal of BOD, TSS and COD were 96 %, 98% and 97% on the other hand using Fe electrodes, results were 93 %, 94 %, and 95 % respectively, the optimizing parameters were (initial pH =7.5, electrode distance= 20 mm, time of retention = 8 min., and current density = 3.5 mA/cm2). The experimental findings revealed that the effluent wastewater was odorless, clear and suitable for reuse.
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