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Effectiveness of Electrooxidation Process for Stabilizing and Conditioning of Urban and Industrial Wastewater Sludge

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The objective of this research was to investigate the performance of an electrochemical process for enhancing dewaterability and stabilize wastewater sludge from paper mill industry (PMS) and municipal wastewater (MWS) treatment plants. The treatment was conducted using 13.2 kg of sulfuric acid (H2SO4) per ton of dry sludge (TDS) and 200 kg of NaCl/tds as electrolytes, at a current intensity of 8A for 60 min. The process was efficient for increasing the dryness of PMS with an average value of 25.3 ± 1.2% (w/w). By comparison, the electrochemical treatment using MWS allowed increasing the dryness to 33.4 ± 1.4% (w/w). Simultaneously, the process was found to be effective in removing pathogen indicators (abatement > 4 to 5 log units of total and fecal coliforms) using either PMS or MWS. At the same time, it preserved the fertilizing properties of sludge by maintaining the concentration of Ptot, N-TKN and COD in dewatered sludge. The substitution of sodium chloride (used as electrolyte) by sodium sulfate (Na2SO4) combined with hydrogen peroxide (H2O2) allowed reducing the formation of organo-chlorinated compounds: more than 50% of chloroform was reduced, 86% of toluene was reduced and 59% of phenolic compounds was reduced.

Keywords: electro-oxidation; municipal wastewater sludge; odor removal; organic pollutant; paper mill sludge; pathogen removal; sludge dewatering; stabilization

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143012X13415215907257

Affiliations: 1: Professor, Institut national de la recherche scientifique (Centre Eau Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, QC, Canada, G1K 9A9; Phone: (418) 654-3119, Fax: (418) 654-2600 2: M.Sc. student, Institut national de la recherche scientifique (Centre Eau Terre et Environnement), Université du Québec. 3: Professor, Institut national de la recherche scientifique (Centre Eau Terre et Environnement), Université du Québec.

Publication date: January 1, 2013

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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