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To investigate factors affecting the removal of phosphorus from the practical wastewater in the F-STEP PROCESS using a loess ball and Chromobacterium WS 2-14, first, the loess ball size and calcining temperature, initial pH, initial phosphorus concentration, working temperature, and aeration were studied. A 2～4 ㎜ of loess ball made at 960℃ of calcining temperature was the most suitable one for the removal of phosphorus. When the initial pH was increased from 3.0 to 6.0, the removal efficiency of phosphorus was increased. Especially, at 6.0 of initial pH, the maximum removal efficiency of phosphorus was 88.7%. The maximum removal efficiency of phosphorous was gained, 1.8 ㎎/h when the initial concentration of phosphorous was 5.0 ㎎/l. When the operating temperature was 30℃, the maximum removal efficiency of phosphorus was obtained. In the case of aeration, when it was increased from 0.5 to 5.0 L/min, the removal efficiency of phosphorus was increased. On the other hand, above 7.0 L/min, the removal efficiency of phosphorus did not increased. Using the optimum operation conditions, pilot tests for the effective removal efficiency of phosphorus were carried out for 65 days. The average removal efficiency of phosphorus was 92.0%. The average removal efficiency of COD, BOD, and SS were 77.1, 74.2, and 86.4%, respectively. From the results, it can be concluded that F-STEP PROCESS using loess ball might be useful process for phosphorus removal
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