| Title |
The Study of a Novel Coagulation Technology Using the Atomized Molten Slag as Weighted Coagulation Additives |
| Authors |
김동건 ( Kim Dong Geon ) ; 박대원 ( Park Dae Won ) ; 장원석 ( Jang Won Seog ) |
| Keywords |
Wastewater; Atomized Molten Slag; PDA; Photometric Dispersion Analyzer; Coagulation; Flocculation; Zeta Potential; WCA; Weighted coagulation Additives; 폐수; 분사된 제강슬래그; 응집; 응결; 표면전위; 가중응집제 |
| Abstract |
A novel coagulation technology using the atomized molten slag with ferrous sulfate has been developed to treat a turbid and colored water or wastewater. The atomized molten slag is produced by atomizing the molten slag from steel making process. The atomized molten slag has magnetic iron oxide in its constituent molecules so that it is magnetized. In this study, this new coagulation technology was compared with metal hydroxide flocs such as FeCl₃ and PAC in treating textile wastewater. The settling velocity of sludge formed with the atomized molten slag is almost 10 times greater than that of sludge formed with FeCl₃ or PAC. The coagulation using the atomized molten slag showed higher removal rate of color, suspended solid, TOC. COD, TKN and T-P. Weighted Coagulation Additives(WCA) such as molten slag, Ca(OH)₂, and bentonite were added to the coagulation basin, while the process of coagulation and flocculation were monitored by PDA (Photometric Dispersion Analyzer). The zeta potential of sludge and specific resistance were measured. In the result, molten slug was proved to be the promising material for efficient coagulation, because it led to bigger floc and faster sedimentation than other WCA. |