Effects of microplastics on the removal of trace organic compounds during ozonation: Oxidation and adsorption of trace organic compounds and byproducts

• Published in: Environmental pollution (1987) Vol. 280; p. 116878
• Main Authors: Lee, Hyeonho, Im, Sung-Ju, Kim, Yoogon, Lee, Gwanghee, Jang, Am
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.07.2021
• Subjects: Lab-scale ozonation; Microplastics; Trace organic compounds; Transformation byproduct; Lab-scale ozonation; Microplastics; Trace organic compounds; Transformation byproduct
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2021.116878

Trace organic compounds (TOrCs) and microplastics (MPs) have been recognized as emerging pollutants that cause severe water pollution related problems due to their non-degradable and bio-accumulative nature. Many studies on oxidation processes such as ozone have been conducted to efficiently remove TOrCs in water treatment. However, there has been a lack of research on the removal efficiency of TOrCs in the oxidation process when they co-exist with MPs and form transformation byproducts (TBPs) during this process. This study evaluates the effects of MPs on TOrC removal during ozonation at various ozone concentrations and based on the mass of MP particles in distilled water. The adsorption of TBPs and TOrCs was also evaluated using the Freundlich and Langmuir isotherm equations. The toxicity of these compounds was evaluated to confirm the risk to aquatic ecosystems. The results show that triclosan (TCS) had the highest absorption capacity amongst the TOrCs and TBPs tested. Polyvinylchloride exhibited the highest adsorption efficiency compared with polyethylene and polyethyleneterephthalate (TCS 0.341 mg/g) due to its high adsorption capacity and hydrophobicity. In the toxicity test, 2,4-dichlorophenol and 4-chloroaniline as TBPs had a relatively higher toxicity to Vibrio fischeri (a marine bacterial species) than Daphnia magna (a freshwater plankton species). [Display omitted] •The removal rate of TOrCs increased during ozonation with MPs.•The adsorption capacity of MPs was ∼0.341 mg/g for PVC.•The adsorption and log Kow of TBPs and TOrCs was strongly correlated.•The toxicity of MPs, TOrCs, and TBPs was evaluated using Daphnia magna and Vibrio fischeri.