Abstract:
Currently, decreasing water quality due to contamination of industrial wastes that are discharged
to environment is a very serious problem, one of them is coconut milk industry wastewater. MSL
(Multi Soil Layering) is an alternative method that can be effectively used in industrial wastewater
treatment processes. Utilization of modified MSL method with the addition of rice husks may
increase the yield of coconut milk industry wastewater treatment. This study aimed to determine the
effectiveness of TSS, BOD, COD, and E. coli reduction using modified MSL method for coconut
milk industry wastewater based on aeration and non-aeration processes and variation of flow rate.
This experimental study used modified MSL equipment with the addition of rice husks which
consisted of andosol soil, coconut shell charcoal, iron powder, rice husk and perlite which were
arranged like brick construction. The indicators observed in this study were the effect of aeration
and non-aeration processes and variations of flow rate on parameters changes of TSS, BOD, COD,
and E.coli count. Variations of flow rate used in this study were 5; 10; 20; and 40 ml / minute. The
research results suggested that modified MSL method with rice husk is efficient and effective. In the
aeration process, the decrease in turbidity reached 99.79%; BOD 35.68%; COD 86.64%; and
E.coli 99.79% while in the non-aeration process, the decrease in turbidity reached 98.66%; BOD
33.01%; COD 84.62%; E.coli 99.92%; Overall, the effective flow rate for reducing pollution levels
in the coconut milk industry wastewater based on these indicators was 5 ml / minute, both in
aeration and non-aeration treatments.
