PENGARUH HYDRAULIC LOADING RATE (HLR) DAN KONSENTRASI INFLUEN TERHADAP PENYISIHAN PARAMETER BOD, COD DAN NITRAT PADA PENGOLAHAN AIR LIMBAH DOMESTIK CAMPURAN (GREY WATER DAN BLACK WATER) MENGGUNAKAN REAKTOR UASB

Abstract

In this study using a mixture of domestic wastewater. Parameters to be researched is the Biological Oxygen Demand (BOD₅), Chemical Oxygen Demand (COD) and nitrate-nitrogen (NO₃^-N). Alternative anaerobic treatment is to use UASB (upflow Anaerobic Sludge Blanket) . This study performed a variation of Hydraulic Loading Rate (HLR) and the influent concentration to obtain the optimum conditions on an UASB reactor laboratory scale for removal BOD₅, COD and NO₃^-N in a mixture of domestic waste water (grey water and black water). Pollutant removal efficiency by varying the influent concentration and HLR for BOD₅ was about 57% -76%, for COD was about 59% -69% and NO₃^-N was about 75% -98%. The results is the lower influent concentration will decrease removal efficiency that occurred on the parameters of BOD₅, COD and NO₃-N. The maximum removal efficiency on the parameters BOD₅ and COD occurs when HLR low at 0.025 m³/m²/hour or 6.94 x 10-6 m / s. While the maximum removal efficiency of NO₃^-N occurred when HLR high 0.05 m³/m²/hour or 1.4 x10-5 m / s.  Removal for BOD₅ optimum occurs at low concentrations are 419 mg / l with a variation HLR of 0.05 m³/m²/hour  or 1.4 x10-5 m / s,  for COD occurred at low concentrations are 878 mg / l with a variation HLR of 0.025 m³/m²/hour or 6.9 x10-6 m / s, and NO₃^-N concentration was occur in the 36 mg / l with a variation  HLR of 0.033 m³/m²/hour  or 9.2 x10-6 m / s. The results of treatment using UASB  still above the standards that should UASB be used as a secondary treatment  to obtain the effluent below quality standart.