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Open AccessFeature PaperArticle

Electrocoagulation as a Pretreatment for Electroxidation of E. coli

Department of Civil, Construction and Environmental Engineering, Marquette University, Milwaukee, WI, 53233, USA
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Water 2019, 11(12), 2509; https://doi.org/10.3390/w11122509
Received: 31 October 2019 / Revised: 22 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
Insufficient funding and operator training, logistics of chemical transport, and variable source water quality can pose challenges for small drinking water treatment systems. Portable, robust electrochemical processes may offer a strategy to address these challenges. In this study, electrocoagulation (EC) and electrooxidation (EO) were investigated using two model surface waters and two model groundwaters to determine the efficacy of sequential EC-EO for mitigating Escherichia coli. EO alone (1.67 mA/cm2, 1 min) provided 0.03 to 3.9 logs mitigation in the four model waters. EC alone (10 mA/cm2, 5 min) achieved ≥1 log E. coli mitigation in all model waters. Sequential EC-EO did not achieve greater mitigation than EC alone. To enhance removal of natural organic matter, the initial pH was decreased. Lower initial pH (pH 5–6) improved E. coli mitigation during both stages of EC-EO. EC-EO also had slightly greater E. coli mitigation than EC alone at lower pH. However, EO alone provided more energy efficient E. coli mitigation than either EC or EC-EO.
Keywords: drinking water treatment; electrochemical; bacteria; small systems; iron; Escherichia coli; disinfection; inactivation drinking water treatment; electrochemical; bacteria; small systems; iron; Escherichia coli; disinfection; inactivation
MDPI and ACS Style

Lynn, W.; Heffron, J.; Mayer, B.K. Electrocoagulation as a Pretreatment for Electroxidation of E. coli. Water 2019, 11, 2509.

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