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http://dx.doi.org/10.11001/jksww.2021.35.4.285

Effects of coagulation-UF pretreatment on pressure retarded osmosis membrane process  

Goh, Gilhyun (Department of R&D, MEMCOREA Co.,Ltd.)
Kim, Suhyun (Department of R&D, MEMCOREA Co.,Ltd.)
Kim, Jungsun (Universal Environment Policy Institute)
Kang, Limseok (Department of Environmental Engineering, Pukyong national University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.35, no.4, 2021 , pp. 285-292 More about this Journal
Abstract
Osmotic power is to produce electric power by using the chemical potential of two flows with the difference of salinity. Water permeates through a semipermeable membrane from a low concentration feed solution to a high concentration draw solution due to osmotic pressure. In a pressure retarded osmosis (PRO) process, river water and wastewater are commonly used as low salinity feed solution, whereas seawater and brine from the SWRO plant are employed as draw solution. During the PRO process using wastewater effluent as feed solution, PRO membrane fouling is usually caused by the convective or diffusive transport of PRO which is the most critical step of PRO membrane in order to prevent membrane fouling. The main objective of this study is to assess the PRO membrane fouling reduction by pretreatment to remove organic matter using coagulation-UF membrane process. The experimental results obtained from the pretreatment test showed that the optimum ferric chloride and PAC dosage for removal of organic matter applied for the coagulation and adsorption process was 50 mg/L as FeCl3 (optimum pH 5.5). Coagulation-UF pretreatment process was higher removal efficiency of organic matter, as also resulting in the substantial improvement of water flux of PRO membrane.
Keywords
Pressure retarded osmosis; Pretreatment; Coagulation-UF; PAC adsorption-UF; Water flux;
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