{"id":18027,"date":"2020-07-08T12:30:00","date_gmt":"2020-07-08T12:30:00","guid":{"rendered":"https:\/\/dev.inrs.ca\/using-electricity-to-break-down-pollutants-left-over-after-wastewater-treatment\/"},"modified":"2020-09-15T10:44:37","modified_gmt":"2020-09-15T14:44:37","slug":"lelectricite-pour-degrader-des-polluants-qui-echappent-aux-traitements-des-eaux","status":"publish","type":"post","link":"https:\/\/dev.inrs.ca\/en\/news\/using-electricity-to-break-down-pollutants-left-over-after-wastewater-treatment\/","title":{"rendered":"Using electricity to break down pollutants left over after wastewater treatment"},"content":{"rendered":"\n

Pesticides, pharmaceutical products, and endocrine disruptors are some of the emerging contaminants often found in treated domestic wastewater, even after secondary treatment. Professor Patrick Drogui<\/a> of the Institut national de la recherche scientifique (INRS) and his team have tested the effectiveness of a tertiary treatment process using electricity in partnership with the European Membrane Institute in Montpellier (IEM) and Universit\u00e9 Paris-Est.<\/strong><\/strong><\/p>\n\n\n\n

The advanced electro-oxidation process (EOA) uses two electrodes to break down non-biodegradable pollutants that remain after biological treatment. Electric current is passed through the electrodes, generating hydroxide radicals (\u00b7OH), which attack the refractory molecules. The primary advantage of this method is that it does not require any chemicals to be added to the water.<\/p>\n\n\n\n

\"L\u2019\u00e9lectricit\u00e9<\/figure>\n\n\n\n

The advanced electro-oxidation process (EOA)uses two electrodes to break down non-biodegradable pollutants that remain after biological treatment. Electric current is passed through the electrodes, generating hydroxide radicals (\u00b7OH),which attack the refractory molecules. The primary advantage of this method is that it does not require any chemicals to be added to the water.<\/p>\n\n\n\n

\u201cEOA processes are revolutionary in the field of wastewater treatment. It\u2019s pioneering technology for treating wastewater contaminated by refractory pollutants such as pharmaceutical wastes,\u201d<\/p>said Professor Patrick Drogui, co-author of the study published on June 18<\/a> in the prestigious journal Science of the Total Environment<\/em>.<\/cite><\/blockquote>\n\n\n\n

The researchers tested new catalytic electrodes. \u201cWe have shown that these electrodes are effective and produce large quantities of hydroxide radicals. They are also cheaper than the other electrodes currently on the market, which reduces the cost of the treatment,\u201d said Yassine Ouarda, Ph.D. student and first author on the study.<\/p>\n\n\n\n

Versatile Tertiary Treatment<\/strong><\/strong><\/h2>\n\n\n\n

Researchers tested the technology on three types of water coming from different treatment processes: conventional, membrane bioreactor, and a treatment process that separates wastewater, including feces, at the source. They focused on paracetamol, otherwise known as acetaminophen. <\/p>\n\n\n\n

\u201cWe tested the process on this particular molecule because it\u2019s one of the world\u2019s most widely used drugs. We have already tested it at INRS for some 15 different pollutants, as the process can be used for other pharmaceutical molecules,\u201d<\/p>said Mr. Ouarda.<\/cite><\/blockquote>\n\n\n\n

During partial breakdown of pollutants such as pharmaceuticals, the by-products can be more toxic than the parent compounds. \u201cWeobserved that the toxicity of the solution increased and subsequently decreased during treatment. This indicates that the toxic molecules are themselves broken down if the reaction continues,\u201d said Mr. Ouarda.<\/p>\n\n\n\n

\u201cThis work once again confirms that advanced electro-oxidation processes are good candidates for breaking down drug wastes left behind after biological treatment,\u201d said Professor Drogui.<\/p>\n\n\n\n

\"Patrick
Professor Patrick Drogui<\/figcaption><\/figure><\/div>\n\n\n\n

About the study<\/strong><\/h2>\n\n\n\n

The paper \u201cElectro-oxidation of secondary effluents from various wastewater plants for the removal of acetaminophen and dissolved organic matter\u201d, by Yassine Ouarda, Cl\u00e9ment Trellu, Geoffroy Lesage, Matthieu Rivallin, Patrick Drogui and Marc Cretin, was published on June 18 in the journal Science of the Total Environment. <\/em>They received financial support from Mitacs through the Mitacs Globalink program. DOI: https:\/\/doi.org\/10.1016\/j.scitotenv.2020.140352<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Pesticides, pharmaceutical products, and endocrine disruptors are some of the emerging contaminants often found in treated domestic wastewater, even after secondary treatment.<\/p>\n","protected":false},"author":297,"featured_media":12200,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[688],"tags":[],"sectors":[729,728],"class_list":["post-18027","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-innover-a-linrs-en","sectors-environnement-en","sectors-eau-en"],"acf":[],"yoast_head":"\nUsing electricity to break down pollutants left over after wastewater treatment | INRS<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using 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