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Micro(nano)plastic Size and Concentration Co-differentiate the Treatment Performance and Toxicity Mechanism in Aerobic Granular Sludge Systems by Bing Zhang; Shuchang Huang; Lian Wu; Yuan Guo; Wenxin Shi; Piet N.L. Lens is a Engineering article available to read on EtoBox.

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Microplastics (MPs) and nanoplastics (NPs) released into wastewater may pose threats to the biological treatment process. Aerobic granular sludge (AGS), a prospective biotechnology for wastewater treatment, can effectively intercept MPs and NPs, but the effect of these emerging contaminants on the AGS system lacks investigation. This study showed that low concentrations of MPs and NPs (1 mg/L) posed negligible inhibitory effects on the characteristics and performance of the AGS system. Yet, increasing MPs concentrations to higher levels (20 and 100 mg/L) impaired the granular integrity and diminished the total nitrogen (TN) removal efficiency by 3.8 %–17.8 %, especially for the denitrification process. Compared to MPs, prolonged exposure to NPs at the same levels showed greater adverse effects on the AGS, as evidenced by overgrowth of filamentous bacteria and lower TN removal efficiency (decreased by 11.4 %–22.8 %). This was possibly due to biofilm formation on the surface of MPs and excessive secretion of extracellular polymeric substances served as barriers to mitigate the toxic effects of MPs. In contrast, microorganisms were directly exposed to the toxicity of NPs, resulting in

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Author

Bing Zhang; Shuchang Huang; Lian Wu; Yuan Guo; Wenxin Shi; Piet N.L. Lens

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)