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Landfill Leachate Treatment and Boron Removal by Reverse Osmosis  

Jung, Soojung (Yeongsan River Environment Research Center, National Institute of Environmtental Research)
Na, Sukhyun (Department of Environmental Engineering, Chonnam National University)
Bae, Sangok (Department of Culinary Art, Chodang University)
Lim, Byungjin (Yeongsan River Environment Research Center, National Institute of Environmtental Research)
Publication Information
Journal of Korean Society on Water Environment / v.28, no.5, 2012 , pp. 657-662 More about this Journal
Abstract
This study was carried out to evaluate the removal rate of organic and inorganic matters from landfill leachate using pre-treatment process as coagulation and limonite adsorption, and membrane process as RO (reverse osmosis) and NF(nanofiltration). By adding limonite adsorption as pre-treatment process, about 40% of organic matters in leachate was removed through pre-treatment process and 74.7% of boron was removed after RO process without pH adjustment. The rejection rate of boron in RO process mainly depends on the pH and increased at pH value of 10. RO process was performed as two stage system adjusting pH condtion to 7 and 10 in second RO stage for boron removal. Most (>90%) of TOC, Cl- and inorganic matters as Ca was rejected in first RO stage, the residue was rejected in second RO and the rejection rate was above 97%. Considering economic efficiency of operation cost, NF substituted for the first RO and total removal rate of TOC was above 90%. Through RO system toxicity to Daphnia in leachate was removed completely.
Keywords
Boron removal; Landfill leachate; Limonite adsorption; Nanofiltration; Reverse osmosis; Toxicity reduction;
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