at 13H30 | 518 C

Treatments for Emerging Contaminants and Inorganic Compounds

Moderated by: Gilles Michaud, Envirodoc inc.
Innovation and clean technology

- Asbestos removal of industrial sites and brownfields

The presentation will focus on all the subjects raised by asbestos and its remediation. The following subjects will be approached: - Health or social issues surrounding asbestos - Assessing the level of pollution (sampling, skills used for each type of material) - Evaluating the amount of work to be undertaken (estimating costs, drawing hypothesis) - Setting up the work site planning and processes (selecting the machinery and processes, appointing experts and engineers, allocating the required certification and trainings) - Monitoring a work site (works, HSEQ) - Different types of work sites : rehabilitation, dismantling - Waste management

- Multiple Lines of Evidence Approach to Assess PFAS Sources, Contaminant Distribution, and Fate and Transport

PFAS have become one of the main emerging contaminant classes of focus in the public domain. In view of the complexities associated with source composition, contaminant transport and PFAS distribution, we have developed a multiple-lines of evidence approach (MLEA) for comprehensive PFAS site characterization. The MLEA is easy to implement and scalable based on site complexity and project objectives. The presentation will explain the use of the MLEA and show its application to specific case studies. It will demonstrate how this approach can be successfully used to: • Characterize and differentiate PFAS sources, plumes, background concentrations and identify instances where cross-contamination occurred; • Compare PFAS signatures in multiple investigation locations and between media to assist with fate and transport assessment; • Assists with the identification of critical parameters to focus on for investigation, monitoring, risk assessment, risk management or remediation.

- Novel Zero Valent Iron (ZVI) Media for Selenium Removal from Groundwater

Typical zero valent iron media has several limitations for selenium-based contaminant removal, primarily due to low reactivity, limited capacity, and surface passivation. In order to address these challenges, an array of innovative ZVI media (Cleanit® media series), were engineered with customizable reactivity, particles size, and surface characteristics. A batch kinetic study, using Cleanit® media, was conducted with an initial selenium concentration of 10 mg/L and a loading rate of 0.1 mg Se/g media. Within 24 hours, all four selenium species were removed to below the detection limit (1 µg Se/L). Since selenate is the most challenging selenium species to be removed by ZVI, column tests were conducted using three different grades of Cleanit® media. Cleanit® media demonstrated selenate removal efficiencies between 97 and 98%. In summary, Cleanit® media demonstrated a significant potential for organic and inorganic selenium removal for groundwater remediation.