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DOI : , Vol.21, No.6, 47 ~ 56, 2013
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| Title |
| Adsorption Characteristics of Phosphorus by Zirconium Ferrite |
| 신정필 Jeong Pil Shin , 조현희 Hyun Hee Cho , 윤성동 Sung Dong Yoon , 고인범 In Beom Ko , 전양근 Yang Kun Chun |
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| Abstract |
| In this research, the adsorption characteristics of zirconium ferrite as the adsorbent for the phosphate removal were investigated. The adsorption capacity of phosphate by zirconium ferrite in batch system and the feasibility for phosphate adsorption filter installed after MBR process (Q = 75 ㎥/d) were tested. The reaction rate constant, k (g/mgㆍmin) obtained through pseudo-second reaction model was ranged from 5.9×10-4∼8.3×10-3 at 4g∼8g of zirconium ferrite dose. In addition, the regression value by pseudo-second reaction model was above 0.98 indicating that the chemical reaction between adsorbent and phosphate was main mechanism. The sorption isotherm of phosphate with zirconium ferrite was well fitted by Langmuir equation (R2=0.98) compared to Freundlich equation (R2=0.84). The adsorption capacity of phosphate by zirconium ferrite was found to pH-dependent, and less adsorption was observed at the increase of pH from 4 to 9. We confirmed that the zirconium ferrite performance did not change through repeated regeneration test using 7 wt% NaOH and 1 wt% H2SO4. After MBR processes, the adsorption filters were installed in parallel. As the treatment capacity increased from 15 ㎥/d to 35 ㎥/d, the processing performance of phosphate decreased. Both breakthrough time values for adsorption filter design (15.9 days) and the actual operation (12 to 20) were similar. |
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| Key Words |
| Zirconium ferrite, phosphate adsorption, phosphorus removal, Langmuir Isotherm, Freundlich Isotherm |
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