4.6 Article

Enhancing Microplastics Removal from Wastewater Using Electro-Coagulation and Granule-Activated Carbon with Thermal Regeneration

期刊

PROCESSES
卷 9, 期 4, 页码 -

出版社

MDPI
DOI: 10.3390/pr9040617

关键词

microplastics; granule activated carbon; pyrolysis; electro coagulation

资金

  1. Korea Environment Industry & Technology Institute (KEITI) through the Intelligent Management Program for Urban Water Resources Project - Korea Ministry of Environment (MOE) [2019002950002]
  2. Korea Environmental Industry & Technology Institute (KEITI) [ARQ201903089003] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study demonstrates that using granular activated carbon with thermal regeneration can efficiently remove microplastics from sewage treatment plants, and further enhance removal efficiency through electro-coagulation experiments.
Discharge from sewage treatment plants (STPs) is a significant pathway of entry for microplastics (MPs) to the environment. Therefore, STPs should be considered as an important barrier to the distribution and circulation of MPs in the aquatic environment. In this study, the fate and material-specific properties of MPs were investigated in an STP-equipped and granule-activated carbon (GAC) tower with a thermal regeneration system. This system functioned with a tertiary treatment unit. The GAC with thermal regeneration removed 92.8% of MPs and was useful for removing MPs with a specific gravity less than that of water and with a size of 20-50 mu m, which had negligible removal in the conventional STP process. In addition, a lab-scale electric-coagulation experiment was conducted to examine its potential utility as a pretreatment process for further enhancing the removal efficiency of MPs by GAC. After 30 min of electro-coagulation using aluminum electrodes, 90% of MPs were converted into separable flocs by centrifugation. These flocs may be effectively removed by GAC or other tertiary treatment steps. This study demonstrates that GAC with thermal regeneration is a tertiary process that can efficiently prohibit the release of MPs from STPs and circulation of MPs in the natural environment.

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