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Temuan Mikroplastik pada Air di Instalasi Pengolahan Air 50 Liter per Detik Kamijoro Kabupaten Bantul

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Researchers measured microplastic abundance in inlet and outlet water at a 50-liter-per-second drinking water treatment plant in Bantul, Indonesia, finding 3,372 particles/liter in untreated water and a 70% reduction to 1,416 particles/liter after treatment, with polystyrene and polyamide fibers as the dominant polymer types identified by FTIR.

Mikroplastik telah teridentifikasi di semua sedimen sungai DIY salah satunya Sungai Progo. Sungai Progo digunakan oleh Perumda Air Minum Kabupaten Bantul sebagai air baku untuk Instalasi Kamijoro. Tujuan penelitian ini dilakukan yaitu untuk mengukur kelimpahan, mengelompokkan karakteristik mikroplastik (bentuk, ukuran, warna) dan mengidentifikasi jenis polimer mikroplastik pada Instalasi Pengolahan Air (IPA) 50 liter per detik sebagai instalasi dengan kapasitas terbesar di Kamijoro. Sampel air sebanyak 250 mL diambil pada kolam inlet (sebelum perlakuan) dan kolam outlet (setelah perlakuan) dengan ulangan sebanyak 5 kali per titik yang diambil dengan interval waktu 3 jam. Sampel disaring dengan ayakan mesh berukuran diameter 5 mm dan diberikan H2O2 30% dan NaCl jenuh untuk menghilangkan senyawa organik dan membuat supernatan yang diduga mengandung mikroplastik mengambang di permukaan air. Supernatan disaring dengan kertas saring dan dibilas aquades untuk selanjutnya ditampung pada cawan petri. Mikroplastik yang telah tertampung dihitung kelimpahannya secara visual dengan mikroskop binokuler dan dikonversi dalam satuan partikel per liter. Data dianalisis secara deskrptif untuk membandingkan data pada bak inlet dan bak outlet. Kelimpahan mikroplastik yang diperoleh pada sampel bak inlet IPA 50 liter per detik sebesar 3.372 partikel/liter dan berkurang 70% pada bak outlet sebesar 1.416 partikel/liter. Karakteristik mikroplastik yang dominan ditemukan pada sampel air pada bak inlet dan bak outlet yaitu fiber, berukuran 501-1000 µm pada bak inlet dan bak outlet 1-100 µm, berwarna hitam, serta polimer yang teridentifikasi dari hasil uji FTIR yaitu polistirena (PS) dan poliamida (PA).

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