| Title |
Effect of Operating Condition of Stripping Process on Ammonia Removal for Pre-treatment of Swine Wastewater |
| Authors |
황규대 ( Hwang Gyu Dae ) ; 조영무 ( Jo Yeong Mu ) |
| Keywords |
Ammonia stripping; Ammonia nitrogen; Swine wastewater; Spray tower system |
| Abstract |
Lab-scale experiments have been carried out to investigate ammonia stripping with a modified spray tower for removing ammonia nitrogen from swine wastewater. The operating conditions such as initial pH, temperature, air flow, hole size of distributor determining the diameter of water drops, and influent solids concentration were closely examined focusing on removal efficiency of ammonia. As a result of the experiment, in order to achieve high rate of ammonia removal by the air stripping system the air flow rate must be supplied at high rate with sufficiently high initial pH, temperature. The optimum operating condition to meet the residual ammonia concentration of 300 ㎎/L was the initial pH of 1 1.0 at 35 ℃ with the air flow rate of 20 L/min. It also showed that the smaller hole size is, the higher removal rate of ammonia is expected. However, when used a small sized distributor (2 ㎜), the flooding problem at the upper column occurred due to clogging of the hole. With regard to the influent solids concentration, it was showed that the lower concentration of solids, the higher removal rate of ammonia. The removal of particulate materials in influent led to improve the removal efficiency of ammonia, rather than to control the operating condition including initial pH, temperature, and air flow. The empirical correlation between KLa and operating parameters would be driven as, K_(La) = (0.0003 T- 0.0047)·G^(0.3926) ·L^(-0.5169)·C^(0.1849). The calculated K_(La) from proposed formula can be used effectively to estimate the optimum reaction time and to calculate the volume of modified spray tower system. |