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신정필 ( Jeong Pil Shin ),조현희 ( Hyun Hee Cho ),윤성동 ( Sung Dong Yoon ),고인범 ( In Beom Ko ),전양근 ( Yang Kun Chun ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.6
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.
신정필 ( Joeng Pil Shin ),윤성동 ( Sung Dong Yoon ),고인범 ( In Beom Ko ),전양근 ( Yang Kun Chun ),김오환 ( Oh Hwan Kim ),한정구 ( Jeong Ku Han ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.6
In this research, the ion-exchange resin was used to evaluate the removal efficiency of nitrate and phosphate from the sewage. We investigated i) the removal efficiency per different concentration of the sewage influent, ii) the regeneration efficiency of the ion exchange resin per concentration of the regeneration solution and cycle, and finally, iii) the ionic selectivity of the above ion-exchange resins. The average removal efficiency of the ion exchange resin system was 70.76%, 76.63%, 84.29%, and 86.81% for T-N, NO3-N, T-P, and PO4-P, respectively. Under the condition of the input amount of 16 L and flow rate of 1.5 L/min, the regeneration cycle of the ion exchange resin was estimated to be approximately for 7 days while the removal efficiency increased approximately for 10% when the concentration of the regeneration solution was doubled. The Ion-exchange resins, INDIONⓡ NSSR and ASM had excellent selectivity in NO3- and PO43-, respectively. However, when high concentration of NO3- was continuously input to ASM, due to the competition between NO3- and PO43-, the removal efficiency decreased.