ANALISIS KUALITAS AIR LIMPASAN GREEN ROOF MELALUI PROSES FILTRASI DAN AERASI ULTRAFINE BUBBLE

Abstract

Air limpasan green roof berpotensi dimanfaatkan kembali sebagai sumber air alternatif, namun kualitasnya dapat menurun akibat pelindian senyawa dari media tanam. Penelitian ini bertujuan menganalisis pengaruh dan efektivitas kombinasi filtrasi serta aerasi ultrafine bubble (UFB) dalam meningkatkan kualitas air limpasan green roof. Pengolahan dilakukan menggunakan media filtrasi pasir silika dan arang aktif dengan variasi ketebalan 50 cm, 60 cm, dan 70 cm serta aerasi UFB selama 60 menit. Hasil penelitian menunjukkan bahwa kombinasi filtrasi dan aerasi UFB mampu meningkatkan kualitas air melalui penurunan konsentrasi pencemar dan peningkatan kadar oksigen terlarut. Ketebalan media filtrasi 70 cm menghasilkan kinerja pengolahan terbaik. Berdasarkan metode Indeks Pencemaran, kualitas air meningkat dari kategori cemar sedang menjadi cemar ringan menurut Permenkes Nomor 2 Tahun 2023, serta dari cemar ringan menjadi memenuhi baku mutu menurut Peraturan Pemerintah Nomor 22 Tahun 2021. Dengan demikian, kombinasi filtrasi dan aerasi UFB berpotensi diterapkan sebagai alternatif pengolahan air limpasan green roof.

Green roof runoff has the potential to be reused as an alternative water source; however, its quality may decline due to leaching from the growing media. This study evaluated the effect and effectiveness of combining filtration and ultrafine bubble (UFB) aeration in improving green roof runoff quality. The treatment system consisted of silika sand and activated charcoal filtration media with thicknesses of 50 cm, 60 cm, and 70 cm, followed by 60 minutes of UFB aeration. The results showed that the combined treatment improved water quality by reducing pollutant concentrations and increasing dissolved oxygen levels. The 70 cm filtration media exhibited the best performance. Based on the Pollution Index method, water quality improved from moderately polluted to lightly polluted according to Indonesian Ministry of Health Regulation No. 2 of 2023, and from lightly polluted to meeting water quality standards according to Government Regulation No. 22 of 2021. These findings suggest that filtration, combined with UFB aeration, is a promising alternative for treating green roof runoff.