Thank you, Mr. Chair, and thank you for inviting me to this committee meeting.
I'm Luxmy Begum, and I'm here today as an individual expert to share my knowledge and perspective.
I have more than 20 years of experience in the water, waste water and waste management sectors. I have worked for the federal government, the provincial government and several major consulting engineering firms in Ontario. My experience includes water and waste-water treatment plant updates, technology selection, program development and project delivery.
I'm also the founder of TheEcoAmbassador.com, whose focus is to create environmental protection and prevention awareness. I am also an active member of the Canadian Water and Wastewater Association and the Water Environment Association of Ontario.
The focus of my statement today is different contaminants of emerging concern found in waste water and biosolids. A detailed brief was submitted to this committee earlier regarding this study, outlining those contaminants along with their available removal technologies. Today I will leave out those technical parts and go directly to the findings and suggestions regarding them.
The different groups of contaminants in waste water and biosolids that are getting recent attention are per- and polyfluoroalkyl substances, commonly known as PFAS; pharmaceuticals and personal care products; microplastics; and endocrine-disrupting chemicals. The removal of these contaminants from source water and waste water is a necessity, as they may have a considerable effect on the biophysical environment and living organisms, depending on their concentration.
These contaminants generally cannot be successfully eliminated by conventional treatment methods. Advanced treatment technologies, sometimes in combination, are required to remove them to some extent, depending on the contaminants and their concentration. A multiple barrier approach is more effective than a single advanced technology for their elimination.
Usually, these treatment technologies are expensive, with higher capital and operating costs, and are complex to operate. Upgrading existing treatment plants with advanced technologies will require extensive capital and operating costs. In such cases, the focus should be shifted to source control and product elimination or replacement with suitable alternative products that are not leaking those contaminants.
Polyfluoroalkyl substances, or PFAS—also known as “forever chemicals”, due to their long-lasting chemical bond—are a group of more than 12,000 chemicals that are raising concerns due to their potential hazard to human health and the environment. PFAS are used in different consumer and industrial products and are ubiquitous in nature, as they can enter the environment via many different pathways in air, water and land.
PFAS have been detected in waste water and biosolids too, because of their widespread nature, which raises concerns about biosolids' suitability for land application. As PFAS are mainly a chemical compound commonly used in many different consumer products, they end up in trace amounts in waste water, biosolids and other residuals. If the treatment plant receives PFAS-contaminated sewage in the collection system from nearby sources, such as industry, the concentration of PFAS in sewage and sludge will be much higher than the ambient concentration.
Many areas have implemented industrial pre-treatment, such as Michigan in the U.S.A., and thus prevented those contaminants from entering the environment and waste-water treatment plants in a high concentration.
Currently there is extensive research going on regarding PFAS—their quantification protocol, detection limit, exposure impacts and health risks—among various research and scientific committees. Regulators and decision-makers should closely follow those research and scientific findings and make them the basis of their law and enforcement tools.
So far, source reduction of PFAS compounds and phasing out their usage were the most efficient in reducing risks and potential concerns related to PFAS in waste water and biosolids.
Recent research also found that levels of PFAS in rainwater sometimes exceed levels deemed safe by different health and environmental advisory agencies. PFAS can travel through rainwater, potentially contaminating water sources around the world. In such a case, a global agreement on source control and product elimination is a must.
Thank you.