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Mar 9 – 11, 2015
NH Laguna Palace Hotel
Europe/Rome timezone

Fate of fullerenes (C60) during peracetic acid (PAA) post disinfection of treated alum-enhanced combined sewer overflow (CSO) primary treatment

Mar 9, 2015, 5:30 PM
20m
Breakout 2 (NH Laguna Palace Hotel)

Breakout 2

NH Laguna Palace Hotel

Viale Ancona, n° 2 30172 Venice-Mestre, Italy Tel: +39 041 829 6111 Fax: +39 848 390 230
Parallel session 2B: Environmental exposure, release & fate 2B Environmental exposure, release & fate

Speaker

Haitam Elnakar (Department of Civil and Environmental Engineering- University of Alberta)

Description

Discharging combined sewer overflows (CSOs) directly or with minimal treatment into water bodies could elevate the concentrations of nanomaterials (NMs) in the receiving environment as a result of their extensive use in wide range of products. Among different NM types, fullerenes (C60) have been shown to pose risks on humans and aquatic organisms. Consequently, their fate and removal pathways should be assessed, and cost-effective and simple strategies to reduce their concentrations prior to their release should be developed. The objective of this study was to examine, for the first time, the fate of C60 in CSO when the effluent of alum-enhanced CSO primary treatment was disinfected with peracetic acid (PAA). A factorial design jar tests were firstly conducted to determine the optimum C60 removal conditions in terms of applied alum dose, mixing conditions and pH. At optimum coagulation conditions, the water was subjected to a post disinfection using PAA, and the effect of different PAA doses and contact times on the C60 transformation was investigated. The removal of C60 increased with the increase of contact time and applied PAA dose. It was also observed that acetic acid formation affected C60 detection. A further elucidation of the reaction mechanism and reaction by-products is underway.

Primary author

Haitam Elnakar (Department of Civil and Environmental Engineering- University of Alberta)

Co-author

Mohamed Gamal El-Din ("Department of Civil and Environmental Engineering- University of Alberta ")

Presentation materials