Submerged membrane coagulation hybrid system as pretreatment to organic matter removal from seawater

Sanghyun Jeong, Tien Vinh Nguyen, Saravanamuthu Vigneswaran
2011 Water Science and Technology : Water Supply  
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 FeCl 3 at optimum dosage could remove a majority (95%) of hydrophobic compounds. The results from Liquid Chromatography -Organic Carbon Detector (LC-OCD) showed that only less than 0.02 mg/L of hydrophobic compounds was found after coagulation. In addition, the
more » ... n addition, the modified fouling index decreased considerably from 15848 s/L 2 with raw seawater to 3025 s/L 2 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/m 2 ·h in the conventional submerged membrane system to 55 L/m 2 .h in ICSMS. The ICSMS could remain the high DOC removal efficiency (more than 70%) at filtration rate of 20 L/m 2 ·h when keeping the development of trans-membrane pressure (TMP) was significant lower than that of conventional submerged membrane system.
doi:10.2166/ws.2011.036 fatcat:jrtmuv5ftzc45cgi5nm754xz3q