Comparison of electrocoagulation and chemical coagulation pretreatment for enhanced virus removal using microfiltration membranes

Effect of electrode material and supporting electrolyte on the treatment of water containing Escherichia coli by electrocoagulation

“…4 Effect of charge loading and electrode material on E. coli concentration: current density 12.5 mA/cm 2 ; initial pH 7.1; supporting electrolyte NaNO 3 by electrocoagulation was predominantly due to adsorption of the negatively charged E. coli onto the positively charged iron and aluminum flocs and the subsequent removal of the flocs by microfiltration. However, E. coli inactivation at high Fe(III) and Al(III) dosages was attributed to enmeshment prior to removal by microfiltration (Zhu et al 2005). This effect explains the fact that inactivation efficiency is lowest with carbon graphite, given that no metal cation and no flocs are generated with this electrode.…”

“…According to some investigators, the major mechanism of the inactivation of bacteria in the electrochemical cell is disinfection by electrochemically generated oxidants (Diao et al 2004;Drees et al 2003;Jeong et al 2006); 3. High ionic strength due to metallic species (cations) liberated in solution, which act by charge neutralization on microorganisms (Vega-Mercado et al 1997), and metallic hydroxides (flocs) formed as a result of coagulation which act by ''sweep flocculation or enmeshment'' and adsorption (Zhu et al 2005). In fact, the solid oxides, hydroxides and oxyhydroxides provide active surfaces for the adsorption of the polluting species, and they create a sludge blanket that entraps and bridges colloidal particles in the aqueous medium (Mollah et al 2004).…”

“…Electrocoagulation has been widely and successfully been introduced to treat numerous types of wastewater including municipal wastewater, dyeing wastewater and wastewater contaminated with organic species such as phenol (Chen et al 2000;Mollah et al 2004;Yildiz et al 2008). It also has been demonstrated to be effective in removal from water of contamination such as by fluoride, arsenic, Mercury(II), heavy metal, turbidity, virus and algae (Gao et al 2010;Nanseu-Njiki et al 2009;Zhu et al 2005).…”

“…Indeed, some studies have already been devoted to this subject, but many aspects of the process remain unknown such as the influence of the key parameters of electrocoagulation (Ghernaout et al 2008;Zhu et al 2005). In order to elucidate the role of the flocs formed during electrocoagulation on the inactivation of E. coli, the work will focused on the effect of electrode material and supporting electrolyte.…”

Comparison of polyaluminum silicate chloride and electrocoagulation process, in natural organic matter removal from surface water in Ghochan, Iran

“…EC is a an emerging and efficient method in water treatment where the flocculating agent is generated by ion exchange process using electrochemical of a sacrificial anode [13,14]. In electrocoagulation process, there is no addition of chemicals to the water.…”