title: An evaluation on different origins of natural organic matters using various anodes by electrocoagulation.
abstract: In this investigation, natural organic matters (NOM) of different origins (commercial, terrestrial and natural water) were treated by electrocoagulation (EC) process using aluminum, iron and hybrid electrodes. Electrode type effect on removal efficiency was observed for each NOM (commercial, terrestrial, and natural). The results were presented as dissolved organic carbon (DOC) (mg L(-1)) and UV/VIS absorbance (cm(-1)). The specific UV absorbance (SUVA) was determined before and after treatment of water. The lowest effluent concentration was obtained as 5.05 mg L(-1) with hybrid electrode for natural NOM source at its original pH 7.3. In addition, among the metal types, the best UV-abs-254 removal efficiency was obtained as 92.4% with 0.0312 cm(-1) by hybrid electrode at the end of the process. The color removal efficiency of water occurred successfully by Al and hybrid electrodes. Aquatic NOM source was the most resistant to EC treatment with DOC reduction of 71.1%, 59.8%, and 68.6% for Al, Fe and hybrid electrodes, respectively. Zeta potential and floc size of colloids were observed during the process for the determination of destabilization level of natural organic matters in EC process. Fast coagulation or flocculation and incipient instability were formed during electrolysis time for Al and Fe electrode, respectively. SUVA value was reduced to below 2 for three NOM sources studied. The EC process was shown to be a viable for different NOM sources with various metals.
authors.affiliation: Gebze Institute of Technology, Environmental Engineering Department, Cayırova Campus, 41400 Gebze, Kocaeli, Turkey. Electronic address: fulu@gyte.edu.tr.
authors.forename: Feride
authors.initials: F
authors.lastname: Ulu
authors.affiliation: Gebze Institute of Technology, Environmental Engineering Department, Cayırova Campus, 41400 Gebze, Kocaeli, Turkey.
authors.forename: Sibel
authors.initials: S
authors.lastname: Barışçı
authors.affiliation: Gebze Institute of Technology, Environmental Engineering Department, Cayırova Campus, 41400 Gebze, Kocaeli, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Kobya
authors.affiliation: Lappeenranta University of Technology, LUT Savo Sustainable Technologies, Laboratory of Green Chemistry, 50130 Mikkeli, Finland.
authors.forename: Mika
authors.initials: M
authors.lastname: Sillanpää
mesh_terms: D000535:Aluminum / Q000737:chemistry; D045424:Complex Mixtures / Q000737:chemistry*; D004566:Electrodes; D004572:Electrolysis / Q000379:methods*; D005427:Flocculation; D007501:Iron / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D045424:Complex Mixtures; D009930:Organic Chemicals; D000535:Aluminum; D007501:Iron
keywords: Electrocoagulation (EC); Floc size; NOM; Zeta potential