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Effect of Empty Bed Contact Time on Microplastic and Organic Matter Removal in GAC Treatment Processes
Original title: Gac공정의 미세플라스틱과 유기물제거에 따른 공탑체류시간의 영향
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Researchers evaluated the effect of empty bed contact time on granular activated carbon filtration performance for removing both microplastics and natural organic matter from river water, conducting batch and continuous experiments to assess GAC as a treatment option for these co-occurring micropollutants.
The concentrations of micropollutants―specifically microplastics (MPs) and natural organic matter (NOM)―in river water have increased in recent years. Current decentralized water treatment systems, consisting of coagulation-sedimentation, rapid sand filtration with or without granular activated carbon (GAC) filtration processes, are inefficient in reducing MPs and NOM. To assess the removal performance of GAC beds for these contaminants, both batch and continuous experiments were conducted to investigate the effects of GAC filtration on MPs and NOM in river water. The applied empty bed contact time (EBCT) ranged from 8 to 16 min. The results demonstrated that the GAC filter bed achieved high removal efficiency (> 70%) for NOM (DOC, 2-MIB, and geosmin), as well as substantial reduction of particulates (turbidity and MPs). The GAC bed exhibited higher efficiencies ( > 70%) than the SF bed in reducing particulates and NOM, which typically cause membrane biofouling and colloidal fouling. The headloss development rate of the GAC filter bed at an EBCT longer than 16 min was 2-3 times higher than that observed at an EBCT shorter than 10 min. This finding suggests that the combined filtration and adsorption processes in the GAC bed result in greater pore clogging due to the efficient removal of particulates and NOM.
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