Contamination and removal efficiency of microplastics and synthetic fibres in a conventional drinking water treatment plant in Geneva, Switzerland

被引：25

作者：

Velasco, Angel Negrete ^{[1
]}

Gentile, Stephan Ramseier ^{[2
]}

Zimmermann, Stephane ^{[2
]}

Le Coustumer, Philippe ^{[3
,4
]}

Stoll, Serge ^{[1
]}

机构：

[1] Univ Geneva, Fac Sci, Dept FA Forel Environm & Aquat Sci, Uni Carl Vogt,Grp Environm Phys Chem, 66 Blvd Carl Vogt, CH-1211 Geneva 4, Switzerland

[2] SIG, Ind Boards Geneva, Geneva, Switzerland

[3] Univ Bordeaux Montaigne, CNRS, EA Georessources & Environm, 1 Allee F Daguin, Pessac, France

[4] Univ Bordeaux, Bordeaux Imaging Ctr, CNRS, INRA,UMS 3420, 146 Rue Leo Saignat,CS 61292, F-33076 Bordeaux, France

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2023年 / 880卷

关键词：

Microplastics; Synthetic fibres; Conventional drinking water treatment; Removal efficiency; Infrared microscopy; PLASTIC PARTICLES;

D O I：

10.1016/j.scitotenv.2023.163270

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Although it is known that freshwater resources are contaminated with microplastics (MPs), still limited information is known about the efficiency of large drinking water treatment plants (DWTP) to remove microplastics. Moreover, re-ported concentrations of MPs in drinking water variates from some units to thousands of units per litre and the sam -plin g volumes used for MPs analysis are generally heterogeneous and limited. The present study evaluates the removal of MPs and synthetic fibres in the main DWTP of Geneva, Switzerland, by considering large sampling volumes at different time intervals. Furthermore, contrary to other studies, this DWTP does not count with a clarification pro-cess before sand filtration and coagulated water is sent directly to sand filtration. In this study a distinction is made between microplastics as fragments, films, pellets, and synthetic fibres. Raw water and effluents of each filtering mass (sand and activated carbon filtration) are analysed for the presence of MPs and synthetic fibres with sizes >= 63 mu m using infrared spectroscopy. Concentrations of MPs in raw water range from 25.7 to 55.6 MPs/m3 and in treated water from 0 to 4 MPs/m3, respectively. Results show that 70 % of MPs are retained during sand filtration and total removal is equal to 97 % in treated water after activated carbon filtration. Concentration of identified syn-thetic fibres is low (average value of 2 synthetic fibres/m3) and constant in all steps of water treatment. Chemical com-position of microplastics and synthetic fibres is found more heterogeneous in raw water than after sand filtration and activated carbon filtration, indicating the persistence of some types of plastics (like polyethylene and polyethylene terephthalate) in water treatment processes. Heterogeneities in MP concentrations are observed from one sampling campaign to another, indicating significant variations of MP concentrations in raw water.

引用

页数：9