Coagulation of polyvinyl chloride microplastics by ferric and aluminium sulphate: Optimization of reaction conditions and removal mechanisms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F21%3A00545948" target="_blank" >RIV/61388971:_____/21:00545948 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985874:_____/21:00545948

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2213343721014421?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2213343721014421?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jece.2021.106465" target="_blank" >10.1016/j.jece.2021.106465</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Coagulation of polyvinyl chloride microplastics by ferric and aluminium sulphate: Optimization of reaction conditions and removal mechanisms

Popis výsledku v původním jazyce

The occurrence of microplastics (MPs) in water intended for human consumption, including water supplied by drinking water treatment plants (DWTPs), has raised considerable attention. DWTPs appear to be capable of removing some of the MPs present in raw water. However, little is known about the efficiency of distinct treatment processes for MP elimination. This study investigated the coagulation of model MPs, i.e., polyvinyl chloride particles < 50 µm, using ferric and aluminium sulphate. The effects of the coagulant type, dose, and coagulation pH value were described, and different methods of aggregate separation were applied. It has shown that certain proportion of MPs could be removed even in the absence of coagulant via sedimentation or deep-bed filtration, herein simulated by centrifugation. However, when either Fe- or Al-based coagulation was conducted under suitable conditions (ferric sulphate at 20 mg L−1 and coagulation pH 7–8, or 40–60 mg L−1 and pH 5–8, aluminium sulphate at 20–60 mg L−1 and pH 7–8), the removal efficiency of MPs by coagulation-sedimentation significantly increased. The residual MP concentrations then approached those obtained after centrifugation and corresponded to approximately 80% removal. However, when focusing on Fe and Al residuals, a narrower coagulation optimum was defined. Under the optimised coagulation conditions, MPs ≥ 15 µm were completely removed. Nevertheless, a certain fraction of MPs (approximately 20% of the initial concentration, vast majority < 5 µm) was not removable despite the wide range of coagulation conditions tested, which points out the limits of coagulation for MP removal.

Název v anglickém jazyce

Coagulation of polyvinyl chloride microplastics by ferric and aluminium sulphate: Optimization of reaction conditions and removal mechanisms

Popis výsledku anglicky

The occurrence of microplastics (MPs) in water intended for human consumption, including water supplied by drinking water treatment plants (DWTPs), has raised considerable attention. DWTPs appear to be capable of removing some of the MPs present in raw water. However, little is known about the efficiency of distinct treatment processes for MP elimination. This study investigated the coagulation of model MPs, i.e., polyvinyl chloride particles < 50 µm, using ferric and aluminium sulphate. The effects of the coagulant type, dose, and coagulation pH value were described, and different methods of aggregate separation were applied. It has shown that certain proportion of MPs could be removed even in the absence of coagulant via sedimentation or deep-bed filtration, herein simulated by centrifugation. However, when either Fe- or Al-based coagulation was conducted under suitable conditions (ferric sulphate at 20 mg L−1 and coagulation pH 7–8, or 40–60 mg L−1 and pH 5–8, aluminium sulphate at 20–60 mg L−1 and pH 7–8), the removal efficiency of MPs by coagulation-sedimentation significantly increased. The residual MP concentrations then approached those obtained after centrifugation and corresponded to approximately 80% removal. However, when focusing on Fe and Al residuals, a narrower coagulation optimum was defined. Under the optimised coagulation conditions, MPs ≥ 15 µm were completely removed. Nevertheless, a certain fraction of MPs (approximately 20% of the initial concentration, vast majority < 5 µm) was not removable despite the wide range of coagulation conditions tested, which points out the limits of coagulation for MP removal.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20801 - Environmental biotechnology

Projekt

<a href="/cs/project/GA20-29315S" target="_blank" >GA20-29315S: Ekotoxicita mikroplastů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Environmental Chemical Engineering

ISSN

2213-3437

e-ISSN

2213-3437

Svazek periodika

9

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

106465

Kód UT WoS článku

000707234500005

EID výsledku v databázi Scopus

2-s2.0-85116355092