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.
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| 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 17β-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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