Assessment of electrocoagulation for the treatment of petroleum refinery wastewater

Removal of polyaromatic hydrocarbons from waste water by electrocoagulation

“…1 which has a perforated rectangular aluminum sheet as an anode with larger area produced the highest percentage removal of 88% at similar experimental conditions .The geometry of the reactor affects operational parameters including bubble path, flotation effectiveness, floc formation, fluid flow regime and mixing/settling characteristics. From the literature, the most common approach involves plate electrodes (aluminum or iron) and continuous operation (El-Naas et al, 2009). From previous literature (Mouedhen et al, 2008;Zaroual et al, 2009;Lacasa et al, 2011;Kurt et al, 2008), it was found that the perforated anode sheet with larger surface area achieved the maximum percentage removal than the nonperforated anode; this is the same as results obtained from this study.…”

“…Main disadvantages of this method are lack of a systematic approach to EC reactor design and operation, replacement of electrodes at regular intervals, high cost of electricity and anode passivation (Behbahani et al, 2011). On the other hand, main advantages of EC are: the simplicity of the equipment (Linares-Hernandez et al, 2009), no need of additional chemical matter after or before treatment, relatively low area demand, also sludge from this process is intensive and has low water (El-Naas et al, 2009). For these reasons the present work is focused on the EC processes using a sacrificial aluminum anode to remove PAH from waste water by studying variables like current density, initial concentration, time, temperature, pH, and electrolyte concentration (NaCL).…”

Nickel removal from waste water by electrocoagulation with aluminum electrodes

“…These are generated during the electrolysis process by electrodissolution of a sacrificial anode made of aluminium or iron. Electrocoagulation has been successfully performed for treatment and remediation of textile wastewaters [18,19], oil wastes [20,21], diary effluents [22], diesel and biodiesel wastewaters [23,24], laundry wastewaters [25], slaughter house effluents [26], arsenic or fluoride containing waters [27,28] and heavy metal bearing effluents [29][30][31][32][33][34].…”

Harvesting Chaetoceros Calcitrans and Nannochloropsis sp. Via Electroflocculation

“…The surface charge can be neutralized or reduced by adding flocculants such as multivalent cations and cationic polymers to the broth. The flocculants used should ideally be inexpensive, nontoxic and effective in low concentration (El-Naas et al, 2009) and the selection of the flocculants should be so that further downstream processing is not adversely affected by its use. It is performed by adding specific chemicals to the algae water causing the algae to clump together.…”