| Title |
Phosphorus Removal Using Steel Industry By - products : Effects of Agitation and Foreign Material |
| Authors |
( Seung Hwan Lee ; S . Vigneswaran ; Kyu Hong Ahn ) |
| Abstract |
Proper estimation of phosphorous (P as orthophosphate) removal rate is one of the important factors to consider for the design of an efficient land treatment facility. As wastewater containing NH₄^+ in addition to P flows along the hydraulic channel, detailed batch (static) and column (dynamic) sorption experiments for P removal onto slag media from BHP steel industry, Australia, were conducted to study the effects of agitation and NH₄^+ concentration. It took almost 3 times to adsorb more than 90% of the P in the system without agitation. Kinetics of P sorption gives satisfactory predictions by a static, physical, non-equilibrium sorption model (SPNSM) using Freundlich isotherm constants. Effect of agitation was quantified by using the distribution and fluctuation of film transfer constants. The experimental results show that P sorption is slightly affected by agitation. Both for the batch and column experiments on P sorption in the slag, the amount of P adsorbed by which is reduced in the presence of NH₄^+. This reduction was more significant in the static condition. The percentage of P reduction in the presence of NH₄^+ in the dust solution ranged from 33 to 57% depending on the initial P concentration. The average reduction of P sorption in the cake solution was 10% . |