Application of standardized methods to evaluate the environmental safety of polyvinyl alcohol disposed of down the drain.

The purpose of this research was to use polyvinyl alcohol (PVOH) 18‐88 as a case study to evaluate the environmental fate, ecotoxicity, and overall safety profile of water‐soluble, nonmodified PVOH polymers used in detergent films. An OECD 303A Wastewater Treatment Plant Simulation Study was conducted with dissolved organic carbon as the analytical endpoint to evaluate the removal of PVOH 18‐88 during wastewater treatment. During the plateau phase, high levels of removal due to biodegradation were observed (average 97.4 ± 7.1, range: 88%–116%). The OECD 303A study quantitatively verified that surface water is the dominant receiving compartment for PVOH 18‐88 post wastewater treatment. Acute algae, invertebrate, and fish embryo (fish embryo acute toxicity test [FET]) ecotoxicity studies quanitified the 50% lethal/effect concentration (L/EC50) for PVOH 18‐88. Due to the potential for the chorion to impact PVOH 18‐88 bioavailability, both chorionated and dechorionated FET tests were conducted. L/EC50 > 1000 mg/L for FET (chorionated and dechorionated), invertebrate, and algae were observed. The Sustainable Futures (US) and REACH (EU) frameworks were used to evaluate environmental risk. For the US assessment, the Exposure and Fate Assessment Screening Tool was used to predict the single day lowest flow over a 10‐year period (1Q10) surface water concentration and the seven consecutive days of lowest flow over a 10‐year period (7Q10) surface water concentration and compared with acute and chronic concentrations of concern. For the EU assessment, the European Union System for the Evaluation of Substances was used to predict local and regional exposure concentrations and compared to the predicted no effect concentration. For both regulatory assessments, the exposure concentrations were >2 orders of magnitude below the effect concentrations. Integr Environ Assess Manag 2024;20:1693–1705. © 2024 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC). Key Points: Polyvinyl alcohol (PVOH) 18‐88 was used as a case study to evaluate the environmental fate, ecotoxicity, and overall safety profile of water‐soluble, nonmodified PVOH polymers used in detergent films.Polyvinyl alcohol 18‐88 was biodegraded extensively during wastewater treatment.Low ecotoxicity was observed with measured LC/EC50s > 1000 mg/L.The US and EU environmental risk assessments predicted exposure concentrations were >2 orders of magnitude below effect concentrations, providing significant assurance of safety for PVOH 18‐88 as a representative test substance for nonmodified PVOH polymers used in detergent films. [ABSTRACT FROM AUTHOR]