PEMANFAATAN CANGKANG BIJI METE SEBAGAI KARBON AKTIF UNTUK PENURUNAN KADAR BOD, COD DAN TSS PADA LIMBAH GREY WATER DENGAN MENGGUNAKAN METODE FILTRASI

Abstract

Household wastewater that is not properly treated can pollute the environment,
degrade water quality, and burden the capacity of rivers. As a result, the river's ability to decompose
organic matter in the wastewater also decreases. The generated grey water contains a BOD
(Biochemical Oxygen Demand) of 188 mg/L, a COD (Chemical Oxygen Demand) of 377.60 mg/L,
and a TSS (Total Suspended Solids) concentration of 176.6 mg/L. Therefore, it is necessary to treat
grey water before it is discharged into the environment. In this study, the treatment method used is
filtration using coconut fiber, activated carbon from cashew nut shells, and gravel as filter media. The
aim of this research is to analyze the effectiveness of cashew nut shells as activated carbon in
reducing BOD, COD, and TSS in grey water through filtration. The variable used in this study is the
thickness of the filter media. In reactor I, the composition of the media is coconut fiber, cashew nut
shell activated carbon, and gravel (10:10:15 cm), and in reactor II the composition is (15:15:5 cm).
The results of the study showed that grey water treatment using the filtration method was effective in
reducing the concentrations of BOD, COD, and TSS, with reactor II achieving the highest removal
efficiency: 63% for BOD, 63% for COD, and 69% for TSS.