title: Effects of various chemical cleaning conditions for pressured MF process.
abstract: A pilot-scale pressured hollow-fiber microfiltration (MF) process as pretreatment for the reverse osmosis process was studied and operated under various conditions to assess the relative influence of backwashing, chemical enhanced backwashing (CEB), and bag filter application. The pilot plant process consisted of backwashing but without the CEB or the bag filter as the first step of the research. As the second step of the research, the impact of the backwashing on permeability recovery was assessed at different intervals followed by the influence of CEB on flowrate recovery. Results from operating the pilot-scale hollow-fiber membrane modules for more than 1 year have demonstrated that the appropriate pore size of bag filters was 25-50 μm and the optimized backwashing process was every 30 minutes with 25 mg/L of NaOCl, and CEB with an interval of 10 cycles with the use of 100 mg/L NaOCl.
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Sungdong-Gu, Seoul 04763, Republic of Korea E-mail: jk120@hanyang.ac.kr; Research Engineering Development Inc., 94 Seohae-daero, Nam-gu, Incheon 22195, Republic of Korea.
authors.forename: Chang-Kyu
authors.initials: CK
authors.lastname: Lee
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Sungdong-Gu, Seoul 04763, Republic of Korea E-mail: jk120@hanyang.ac.kr.
authors.forename: Chansoo
authors.initials: C
authors.lastname: Park
authors.affiliation: Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 10223, Republic of Korea.
authors.forename: June-Seok
authors.initials: JS
authors.lastname: Choi
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Sungdong-Gu, Seoul 04763, Republic of Korea E-mail: jk120@hanyang.ac.kr.
authors.forename: Jong-Oh
authors.initials: JO
authors.lastname: Kim
mesh_terms: D004553:Electric Conductivity; D005374:Filtration / Q000295:instrumentation / Q000379:methods*; D008567:Membranes, Artificial; D010539:Permeability; D016062:Porosity; D011312:Pressure; D012212:Rheology; D012973:Sodium Hypochlorite / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D008567:Membranes, Artificial; D014874:Water Pollutants, Chemical; D012973:Sodium Hypochlorite