Abstract
Domestic wastewater from the kitchen, bathing, and washing activities contains organic pollutants. The parameter tested was Biological Oxygen Demand (BOD). In this study, Multi Soil Layering (MSL) methods have been used as a processing method. This treatment serves to reduce ammonia levels in wastewater. This study aims to determine the removal of BOD in gray water using the Multi Soil Layering System. Wastewater samples were taken in a residential area of Semarang. In this study, there are 2 stages, namely the preparation and implementation stages. In the seeding and acclimatization process, batch reactors are used for 14-24 days. The next stage is the process of running for 20 days with intermittent flow. Soil Mixture Box (SMB) is a mixture of andosol soil and activated charcoal (reactor A), andosol soil and apus bamboo (reactor B), and andosol soil, activated charcoal and apus bamboo (reactor C). The results of domestic wastewater treatment using the MSL method respectively in the three reactors can remove BOD by 26%, 25%, and 29%.
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