In this study, a commonly used ferric chloride was utilised as coagulant for removing organic compounds from seawater. More than 57% of dissolved organic carbon (DOC) was removed at optimum dosage of 3 mg Fe+3/L. The coagulation by FeCl3 at optimum dosage could remove a majority (95%) of hydrophobic compounds. The results from Liquid Chromatography – Organic Carbon Detector showed that only <0.02 mg/L of hydrophobic compounds was found after coagulation. In addition, the modified fouling index decreased considerably from 15,848 s/L2 with raw seawater to 3,025 s/L2 with seawater after coagulation. In-line coagulation coupled with submerged membrane system (ICSMS) was also trialled. It is observed that critical flux was increased from 20 L/m2·h in the conventional submerged membrane system to 55 L/m2 h in ICSMS. The ICSMS could remain the high DOC removal efficiency (more than 70%) at filtration rate of 20 L/m2 h when keeping the development of trans-membrane pressure was significant lower than that of conventional submerged membrane system.
Submerged membrane coagulation hybrid system as pretreatment to organic matter removal from seawater
Sanghyun Jeong, Tien Vinh Nguyen, Saravanamuthu Vigneswaran; Submerged membrane coagulation hybrid system as pretreatment to organic matter removal from seawater. Water Science and Technology: Water Supply 1 July 2011; 11 (3): 352–357. doi: https://doi.org/10.2166/ws.2011.036
Download citation file: