Penurunan Total Suspended Solid (TSS), Chemical Oxygen Demand (COD), Minyak dan Lemak pada Limbah Pabrik Kelapa Sawit dengan Metode Dissolved Air Flotation (DAF)

Abstract

This study aims to determine the effect of variations in pressure and contact time of wastewater with air to decrease the parameters of TSS, COD, and oils and fats contained in palm oil wastewater. This study uses a series of Dissolved Air Flotation (DAF) process units with the addition of Poly Aluminum Chloride (PAC) coagulant. This research begins with the manufacture of a series of DAF tanks and flotation tanks. Waste flow is carried out in batches and air is flowed upflow through the bottom hole of the DAF tank. In this research, a study will be conducted to find the most suitable pressure and contact time parameters to reduce TSS, COD, and oil and grease from restaurant wastewater with DAF. The pressure variables used in decreasing the parameters of TSS, COD, and oil and fat are absolute 2 atm ; absolute 2.5 atm ; and absolute 3 atm. The contact time variables for decreasing TSS, COD, and oil and fat parameters were 15 minutes, 30 minutes, 45 minutes, 60 minutes, and 75 minutes. The results showed a decrease in each of the tested parameters. The effective pressure to reduce the value of the TSS parameter is the absolute pressure of 3 atm and the absolute pressure of oil and grease is 2.5 atm. While the effective pressure to reduce the value of the COD parameter is an absolute pressure of 3 atm. The best contact time between air and wastewater to set aside the values of the TSS, COD, and oil-fat parameters was 75 minutes.