| Abstract |
| Decentralized water treatment systems that rely on coagulation-sedimentation and rapid sand filtration without granular activated carbon are generally ineffective at removing micropollutants―particularly microplastics (MPs)―and natural organic matter (NOM). Increasing concentrations of MPs and NOM in river water complicate drinking-water treatment by impairing process control and optimization, while also elevating coagulant demand and required disinfectant doses. This study evaluated the performance of biological activated carbon (BAC) filtration for removing MPs and NOM in an advanced treatment train, using empty bed contact times (EBCTs) ranging from 8 to 16 minutes. BAC filtration achieved high removal efficiencies for NOM (85-89% for DOC, 2-MIB, and geosmin) and particulates (85-94%). However, headloss development in the BAC bed increased substantially at EBCTs longer than 16 minutes―approximately 2-3 times higher than at EBCTs below 10 minutes. These results indicate that the combined adsorption and filtration processes in BAC promote pore clogging due to effective particulate and NOM removal, highlighting the need to balance treatment performance with hydraulic sustainability. |
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| Key Words |
| Biological activated filtration, EBCT, Microplastics, NOM, 공탑체류시간, 미세입자성물질, 생물활성탄, 천연유기물질 |
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