Microplastics in municipal wastewater treatment plants: a case study of Denizli/Turkey

doi:10.1007/s11783-023-1699-8

Front. Environ. Sci. Eng.

2023, Vol. 17

Issue (8) : 99 https://doi.org/10.1007/s11783-023-1699-8

RESEARCH ARTICLE

Microplastics in municipal wastewater treatment plants: a case study of Denizli/Turkey

Pelin Koyuncuoğlu(

), Gülbin Erden

Environmental Engineering Department, Engineering Faculty, Pamukkale University, Kınıklı Campus, Denizli 20160, Turkey

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Abstract

● High amounts of microplastics are released to receiving media from WWTPs.

● The effect of classical treatment processes on MP removal is important.

● MP load in the effluent of WWTPs is important for developing treatment technology.

● Additional physical treatment could help further reduce MP discharge.

Plastic particles smaller than 5 mm are microplastics. They are among the significant pollutants that recently attracted attention. Great quantities of microplastics enter the sewage system daily and reach wastewater treatment plants (WWTPs). As a result, WWTPs are potential microplastic sources. Hence, they create a pathway for microplastics to reach aquatic environments with treated wastewater discharge. Studies on microplastic characterization in WWTPs have gained momentum in academia. This study investigates the abundance, size, shape, color, polymer type, and removal efficiencies of microplastics in a municipal wastewater treatment plant (WWTP) in Denizli/Turkey. The results showed that the dominant microplastic shape in wastewater samples was fibers (41.78%–60.77%) in the 100–500 µm (58.57%–80.07%) size range. Most of the microplastics were transparent-white (32.86%–58.93%). The dominant polymer types were polyethylene (54.05%) and polyethylene vinyl acetate (37.84%) in raw wastewater. Furthermore, the microplastic removal efficiencies of the Denizli Central WWTP as a whole and for individual treatment units were evaluated. Although the microplastic pollution removal efficiency of the Denizli Central WWTP was over 95%, the microplastic concentration discharged daily into the receiving environment was considerably high (1.28 × 10¹⁰ MP/d). Thus, Denizli Central WWTP effluents result in a high volume of emissions in terms of microplastic pollution with a significant daily discharge to the Çürüksu Stream.

Keywords Microplastics Wastewater treatment plant Removal efficiency Daily discharge

Corresponding Author(s): Pelin Koyuncuoğlu

Issue Date: 09 March 2023

Cite this article:

Pelin Koyuncuo?lu,Gülbin Erden. Microplastics in municipal wastewater treatment plants: a case study of Denizli/Turkey[J]. Front. Environ. Sci. Eng., 2023, 17(8): 99.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-023-1699-8
https://academic.hep.com.cn/fese/EN/Y2023/V17/I8/99

Fig.1 Microplastic concentrations in wastewater samples.

Fig.2 Size distribution of microplastics in wastewater.

Tab.1 The effect of treatment units on the removal of microplastics of different sizes

Fig.3 Color distribution of microplastics detected in wastewater.

Fig.4 Shape distribution of microplastics detected in wastewater.

Tab.2 The effect of treatment units on the removal of microplastics of different shapes

Fig.5 Polymer type of microplastics in raw wastewater.

Tab.3 Microplastic loads entering the Denizli Central WWTP and discharged to receiving media (?ürüksu stream)

Tab.4 Microplastic concentrations detected in the literature and daily discharged to the receiving environment

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