Electrocoagulation of a raw water of Ghrib Dam (Algeria) in batch using aluminium and iron electrodes

Abstract

Laboratory experiments were carried out to investigate electrocoagulation (EC) of Ghrib Dam's water (Algeria) in batch using aluminium and iron electrodes without addition of chemicals, without pH modifi cation, and without agitation. The optimal conditions are an applied voltage of direct current of 8 V and a current density 74 A m −2 (0.35 A) during 45 min for both electrodes. The microbial pollution is completely removed by essentially electrical field whereas conductivity and turbidity are reduced at 27 and 85% respectively for Fe electrodes and 22 and 97% for Al electrodes by metallic cations. These results prove that water treatment by EC using Al electrodes (fl otation) for low turbid water (7 NTU) is more convenient than Fe electrodes (sedimentation) for both turbidity and organic matter removal. A new parameter to be taken in consideration for EC reactor design the ratio r active volume on reactor volume which is full of water is introduced where the active volume is the active surface multiplied by the distance between the electrodes.

Electrocoagulation Process in the Context of Disinfection Mechanism

“…As mentioned previously, EC stays a viable solution for classical coagulation, During EC process, there are two induced phenomena: electrophoresis and electroflotation [75]; separately, they are well known in electrochemistry's applications and well developed technically and mathematically [76]. How important are these inherent phenomena in EC process efficiency, particularly in removing pathogens deserves more focus [77]. The superior performance of ferrate (VI) has been demonstrated through several studies [78].…”

Decolorization of Methyl Orange (MO) by Electrocoagulation (EC) Using Iron Electrodes Under a Magnetic Field (MF). II. Effect of Connection Mode

“…EC process is more energy consuming at a distance of 2 cm, representing 30 kWh/kg dye; and when the electrodes are kept at a distance between 0.8 and 2 cm, the energy consumption is less than 24 kWh/kg dye ( Figure 5(a)). The energies consumed during MO treatment by EC [38][39][40][41][42] or EC-MF increase up to 31 and 33 kWh/kg, respectively. Then, these energies are stabilized ( Figure 5(b)).…”

Influence of operating parameters on electrocoagulation of C.I. disperse yellow 3

“…The positive metallic species were produced by the Al anode neutralising the negative charges on the polluting molecules [26][27][28][29][30]. When the electrolysis duration was increased, the cationic species as well as metal hydroxide (Al(OH) 3(s) ) concentrations increased [30][31][32]. Consequently, the pollutant removal increased [33][34][35][36].…”