REDUCTION OF COD, BOD AND PHOSPHATE LEVELS IN LAUNDRY WASTEWATER USING AERATION-FILTRATION METHOD

Abstract

Abstract, One of the industries that is currently developing is the laundry industry. The presence of a laundry business provides positive benefits for economic growth but can affect the environment, especially water bodies if it is not processed first. Laundry waste contains several pollutants such as COD (Chemical Oxygen Demand), BOD (Biological Oxygen Demand) and Phosphate. The presence of COD, BOD, and Phosphate in high concentrations and exceeding the quality standards that have been set in water bodies can cause water pollution and death of aquatic organisms. This laundry industry waste treatment research uses a combination of aeration-filtration.

This study aims to determine the efficiency of reducing the levels of COD, BOD and Phosphate obtained by using the aeration-filtration method in the treatment of laundry wastewater. This study used variations in aeration time of 30 minutes and 60 minutes, variations in air flow rate of 3l/minute and 6 l/minute as well as variations in filtration operational time of 0 hours, 3 hours, and 6 hours. The height of the media in the filtration is 15 cm of sand, 25 cm of zeolite and 35 cm of activated carbon.

The results of waste treatment using a predetermined design are effective in reducing COD, BOD, and Phosphate parameters. COD parameters can be reduced from 1002.7 mg/l to 234.7 mg/l with a removal efficiency of 76.59&. The BOD parameter can be reduced from 344.06 mg/l to 91.39 mg/l with a removal efficiency of 73.44%. The phosphate parameter can be reduced from 13.61 mg/l to 5.159 mg/l with an efficiency of 62.09%.