#TITLE_ALTERNATIVE#

• Main Author: AMALIA ( NIM : 15311054 ), NADYA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23413
• Institution: Institut Teknologi Bandung

Groundwater is one of the water sources that used for daily life. The excessive contact with the environment makes groundwater often found contaminated with pollutants as iron (Fe) and manganese (Mn). Aerating the water using cascade aerator is used to remove dissolved iron and manganese with oxidizing it into precipitate. The study of cascade aerator using profiled roof as the surface area, which adopts the principle of a conventional cascade aerator step was conducted. The objectives of this study were to determine the optimum design and operating conditions, as well as the KLa of cascade aerator. The effect of contact and detention time was also examined. Preliminary study was conducted using artificial water while the main study is with groundwater. The optimum design was studied with 2l/min and 5-l/min flow rate variations on 25°, 45°, dan 65° inclination variations. The optimum operating conditions was studied by iron concentration variations of 5-mg/l, 10-mg/l and 14-mg/l and the pH variations of 4.5, 6, and 8. The effect of contact and detention time was conducted by time variations of 0, 30, 60, and 90 minutes. It is concluded that the cascade aerator optimum design is at 2 l/min 25° inclination, which has the longest contact time that is 0.414 minutes with dissolved iron and manganese removal 66.28-83.24% and 3.75-7.43%. The optimum operating conditions occurs in 14 mg/l iron concentration variation with dissolved iron and manganese removal were 66.28-83.24% and 3.75-7.43%, and in pH variations were 66.03-83.79% for and 28.96-34.04%. The effect of detention time after aeration was found improving the removal efficiency. The dissolved iron and manganese removal using groundwater found 39.56-53.24% and 0.3-12.9% and raising the pH to 8 gave increase to the removal to 44.95-56.57% and 16.72-20.42%. The determination of cascade aerator KLa using artificial water and groundwater respectively obtained 0.002 minute-1 and 0.0031 minute-1.