Potential of Chlorella sp Microalgae to Remove Nutrients from Gray Water in the Sequencing Batch Biofilm Reactor (SBBR) System

Abstract

In general, domestic wastewater is divided into two, namely black water and gray water. Gray water waste is usually disposed of directly into drainage and water bodies without prior treatment before being discharged into water bodies, so that it can potentially cause water pollution. Grey water waste that is discharged directly into drainage or water bodies has the potential to cause pollution in water bodies. The high content of organic matter in grey water causes grey water waste to be treated first. One of the grey water treatment that can be done is by utilizing microorganisms. The microalgae Chlorella sp. can utilize organic matter as a source of nutrients for growth. This study aims to remove COD and ammonia parameters contained in grey water. SBBR processing is carried out with variations in the comparison of filling and reaction time, namely 30% : 70%, 40% : 60%, 50% : 50% and 60% : 40% and variation in the number of cycles of 4 cycles and 6 cycles. The best results for COD removal was 85% and ammonia removal was 77% in a reactor with comparison of filling and reaction time of 30% : 70% and the number of cycles is 4 cycles.