Tuesday 26 November 2019

BioLargo Water Collaborator Presented Peer-Reviewed Abstract on AOS Micropollutant Treatment Results at Society of Environmental Toxicology and Chemistry (SETAC) International Conference

We have previously reported in press releases and other public disclosures about the special capabilities for BioLargo’s Advanced Oxidation System (AOS) clean water technology to eliminate micropollutants from water.

Recently, Yuhe He from the lab of Dr. Greg Goss at the University of Alberta presented his work on this topic at the Society of Environmental Toxicology and Chemistry (SETAC) North America Annual Meeting in Toronto, Ontario. The study he presented focused on demonstrating that the AOS is effective in reducing the toxicity of micropollutant-contaminated municipal wastewater. You can read more about his work below.

Micropollutants are widespread and persistent contaminants of significant concern to regulators due to environmental and human health concerns and are difficult to treat using conventional wastewater treatment technologies (such as UV and biological treatment). The fact that our AOS technology shows significant promise as a solution to address micropollutant contamination in municipal water creates a significant opportunity for BioLargo Water to solve a substantial and widespread market need.

BioLargo Water and its collaborators are also committed to disseminating their scientific findings (on the AOS or otherwise) at internationally recognized peer-reviewed scientific meetings such as this one, as part of our mission to advance the understanding and science of water treatment.

Municipal wastewater outflow

The abstract for the presentation delivered by Mr. He is available here:

Assessment on the Environmental Safety of Advanced Oxidation Water Treatment System (AOS)
Y. He, City University of Hong Kong / School of Energy and Environment;
G. Goss, University of Alberta / Biological Sciences;
L. Patterson-Fortin, R. Smith, BioLargo Water, Inc.

The Advanced Oxidation System (AOS) is a water treatment technology for bacterial disinfection and contamination remediation. The AOS can effectively remove bacterial and organic contaminants from water through the electrochemical manipulation of potassium iodide salt, electrolysis, and expanded graphite adsorption. Iodine acts as the primary disinfectant in the system. Evidence shows formation of additional iodinated and oxidative species, which may contribute to the disinfection and decontamination achieved by the AOS reactor. However, the formation of reactive oxygen species and potential secondary oxidative species may pose additional hazards to aquatic organism living in the receiving water affected by the post-treatment effluent. The effect of exposure to AOS treated waters, especially the long-term effect on aquatic ecosystem receptors (fish, invertebrates) is a commonly raised subject of concern, and thus requires further investigation to demonstrate both efficacy and safety of this process. To examine the long-term effects of AOS treated water, a 21-day chronic daphnia exposure, a 96-hour acute zebrafish embryo exposure, and a 14-day chronic rainbow trout exposure, were conducted, with treated and untreated municipal wastewater effluent (MWE) spiked with model organic contaminants, benzo[a]pyrene and 17╬▓-estradiol. The results indicated AOS treatment significantly reduced the adverse effects caused by exposure to MWE and model organic contaminants to baseline levels in daphnia (reduced fecundity), zebrafish embryo (elevated EROD activity), and rainbow trout (elevated plasma vitellogenin). Overall, this study demonstrated that AOS treatment is a promising and environmentally friendly technology for wastewater treatment

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