Concentrations of substituted diphenylamine antioxidants (SDPAs) and benzotriazole UV stabilizers (BZT UVs) in Canadian Wastewater Treatment Plant influent, effluent and biosolids

Concentrations of substituted diphenylamine antioxidants (SDPAs) and benzotriazole UV stabilizers (BZT UVs) in Canadian Wastewater Treatment Plant influent, effluent and biosolids Substituted diphenylamine antioxidants (SDPAs) and benzotriazole UV stabilizers (BZT-UVs) are additives used in industrial and consumer products to prevent degradation or colour change of materials, but their environmental fate and disposition are not well characterized. In this study, SDPAs and BZT-UVs were analyzed in liquid and solid samples collected from wastewater treatment plants (WWTPs) in Canada to investigate the occurrence and fate of these contaminants. SDPAs and BZT-UVs were effectively removed from the liquid stream in most WWTPs mainly through sludge sorption and separation, but biotransformation, UV treatment and filtration may also contribute to removal of some contaminants in advanced treatment plants. In contrast, the removal efficiency of target contaminants using chemically assisted primary treatment was low, likely due to the short hydraulic retention time of this site. Our results suggest that wastewater effluent is a vector of SDPAs and BZT-UVs to the aquatic environment. The results also highlight the high concentrations of SDPAs and BZT-UVs associated with the solid stream in WWTPs, which could affect the beneficial use of biosolids (e.g., compost or land applications). Supplemental Information The Chemicals Management Plan (CMP) is a Government of Canada initiative aimed at reducing the risks posed by chemicals to Canadians and their environment. A key element of the Chemicals Management Plan is the monitoring and surveillance of levels of harmful chemicals in Canadians and their environment. Monitoring and surveillance are essential to identify and track exposure to hazards in the environment and associated health implications. Monitoring and surveillance programs provide the basis for making sound and effective public health and environmental health policies and interventions, as well as measuring the efficacy of control measures. In support of the Chemicals Management Plan, monitoring and surveillance initiatives were established to support Health Canada and Environment and Climate Change Canada scientists, in collaboration with external partners and researchers, to advance our knowledge. This initiative has allowed the Government of Canada to increase its commitment to a number of existing monitoring initiatives, as well as to support new efforts. For more information on the Chemicals Management Plan, please visit https://www.canada.ca/en/health-canada/services/chemical-substances/chemicals-management-plan.html 2021-07-22 Environment and Climate Change Canada open-ouvert@tbs-sct.gc.ca Nature and EnvironmentBiochemicalsSubstituted diphenylamine antioxidants (SDPAs)Benzotriazole UV stabilizer (BZT-UVs)Wastewater treatment plantBiosolidChemicals Management Plan (CMP)Wastewater Monitoring ProgramContaminants CMP _WWTP _SDPA _BZTUV _ Concentrations_EN_FR.csvCSV https://data-donnees.ec.gc.ca/data/substances/monitor/concentrations-of-substituted-diphenylamine-antioxidants-sdpas-and-benzotriazole-uv-stabilizers-bzt-uvs-in-canadian-wastewater-treatment-plant-influent-effluent-and-biosolids/CMP_WWTP_SDPA_BZTUV_Concentrations_EN_FR.csv Scientific Publication - Occurrence and fate of substituted diphenylamine antioxidants and benzotriazole UV stabilizers in various Canadian wastewater treatment processesHTML https://doi.org/10.1016/j.watres.2017.07.055 Substituted Diphenylamine Substance GroupingHTML https://www.canada.ca/en/health-canada/services/chemical-substances/substance-groupings-initiative/substituted-diphenylamine.html Substituted Diphenylamine Substance GroupingHTML https://www.canada.ca/fr/sante-canada/services/substances-chimiques/initiative-groupes-substances/phenylanilines-substituees.html Screening assessment Substituted DiphenylaminesHTML https://www.canada.ca/en/environment-climate-change/services/evaluating-existing-substances/screening-assessment-substituted-diphenylamines.html Screening assessment Substituted DiphenylaminesHTML https://www.canada.ca/fr/environnement-changement-climatique/services/evaluation-substances-existantes/evaluation-prealable-Nphenylanilines-substituees.html Screening Assessment Report Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)- (BDTP)HTML https://www.ec.gc.ca/ese-ees/default.asp?lang=En&n=78FEE504-1 Screening Assessment Report Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)- (BDTP)HTML https://www.ec.gc.ca/ese-ees/default.asp?lang=Fr&n=78FEE504-1 Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)- (BDTP)HTML https://www.canada.ca/en/health-canada/services/chemical-substances/fact-sheets/chemicals-glance/bdtp.html Phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)- (BDTP)HTML https://www.canada.ca/fr/sante-canada/services/substances-chimiques/fiches-renseignements/en-bref/bdtp.html View ECCC Data Mart (English)HTML https://data-donnees.ec.gc.ca/data/substances/monitor/concentrations-of-substituted-diphenylamine-antioxidants-sdpas-and-benzotriazole-uv-stabilizers-bzt-uvs-in-canadian-wastewater-treatment-plant-influent-effluent-and-biosolids/ View ECCC Data Mart (French)HTML https://data-donnees.ec.gc.ca/data/substances/monitor/concentrations-of-substituted-diphenylamine-antioxidants-sdpas-and-benzotriazole-uv-stabilizers-bzt-uvs-in-canadian-wastewater-treatment-plant-influent-effluent-and-biosolids/?lang=fr

Substituted diphenylamine antioxidants (SDPAs) and benzotriazole UV stabilizers (BZT-UVs) are additives used in industrial and consumer products to prevent degradation or colour change of materials, but their environmental fate and disposition are not well characterized. In this study, SDPAs and BZT-UVs were analyzed in liquid and solid samples collected from wastewater treatment plants (WWTPs) in Canada to investigate the occurrence and fate of these contaminants. SDPAs and BZT-UVs were effectively removed from the liquid stream in most WWTPs mainly through sludge sorption and separation, but biotransformation, UV treatment and filtration may also contribute to removal of some contaminants in advanced treatment plants. In contrast, the removal efficiency of target contaminants using chemically assisted primary treatment was low, likely due to the short hydraulic retention time of this site. Our results suggest that wastewater effluent is a vector of SDPAs and BZT-UVs to the aquatic environment. The results also highlight the high concentrations of SDPAs and BZT-UVs associated with the solid stream in WWTPs, which could affect the beneficial use of biosolids (e.g., compost or land applications).

Supplemental Information

The Chemicals Management Plan (CMP) is a Government of Canada initiative aimed at reducing the risks posed by chemicals to Canadians and their environment. A key element of the Chemicals Management Plan is the monitoring and surveillance of levels of harmful chemicals in Canadians and their environment. Monitoring and surveillance are essential to identify and track exposure to hazards in the environment and associated health implications. Monitoring and surveillance programs provide the basis for making sound and effective public health and environmental health policies and interventions, as well as measuring the efficacy of control measures.

In support of the Chemicals Management Plan, monitoring and surveillance initiatives were established to support Health Canada and Environment and Climate Change Canada scientists, in collaboration with external partners and researchers, to advance our knowledge. This initiative has allowed the Government of Canada to increase its commitment to a number of existing monitoring initiatives, as well as to support new efforts.

For more information on the Chemicals Management Plan, please visit https://www.canada.ca/en/health-canada/services/chemical-substances/chemicals-management-plan.html

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