| Title |
Removal of Highly Concentrated Phosphorus in Wastewater using Converter Slag Powder |
| Authors |
김응호 ; 유기상 ; 조진규 ( Eoung Ho Kim ; Ki Sang Yoo ; Jin Kyu Cho ) |
| Abstract |
A completely mixed batch system was used to investigate the effects of Ca^(2+), alkalinity and temperature on the phosphorus removal efficiency per specific surface area and the long-time phosphorus removal characteristics, when the converter slag powder was used for phosphorus removal. As alkalinity of wastewater increased, phosphorus removal rate and pH gradually decreased. It was because Ca^(2+), carbonate in wastewater were decreased by producing CaCO₃. Phosphorus removal rate increased in case of temperature and specific surface area increased. For a 80-hr mixing, 0.188 of Ca^(2+) was gushed out per 1g of converter slag. Among this 75.9% came out during first 48 hours and then the amount of Ca^(2+) and pH decreased, and the rate of phosphorus removal decreased significantly. In case of adding converter slag of 1W/V% passing through the 200 mesh at 20℃, a reactoin order m was about 1.055 and rate constant k was about 1.081 hr¹ in the equation of -dt/ dC=kC^m Also, when adding 0.5W/V%, m and k was about 1.42 and 1.0883( mg/L)^(0.42) hr¹, respectively. |