i ABSTRAK
Air merupakan senyawa kimia yang sangat penting bagi kehidupan makhluk hidup. Hasil survei awal di Desa Gosong Telaga Barat Kecamatan Singkil Utara Kabupaten Aceh Singkil ditemukan air rawa sumur gali mengandung kadar warna yang tinggi sebesar 176 TCU, kekeruhan 36 NTU, pH 3,57 dan kadar besi 3,2 mg/l. Selain menyebabkan gangguan kesehatan juga menimbulkan bau serta menyebabkan warna kuning pada dinding bak, lantai kamar mandi serta bercak kuning pada pakaian.
Tujuan Penelitian adalah untuk mengetahui perbedaan kadar warna, kekeruhan, pH dan kadar besi (Fe) air rawa sumur gali sebelum dan setelah melalui pengolahan air secara koagulasi menggunakan larutan serbuk kulit kerang sebagai bahan koagulan.
Penelitian menggunakan metode eksperimen semu dengan Rancangan Acak Kelompok (RAK) dilakukan dengan lima konsentrasi dosis koagulan dan tiga kali pengulangan. Objek penelitian adalah air rawa sumur gali di Desa Gosong Telaga Barat. Pengambilan sampel dilakukan secara purposive sampling pada 1 sumur, kemudian dilakukan pemeriksaan terhadap sampel sebelum dan sesudah pengolahan.
Setelah dilakukan pengolahan dapat disimpulkan bahwa dosis koagulan yang efektif yaitu pada konsentrasi 30 ml. Kualitas air rawa sumur gali mengalami perbaikan, rata-rata parameter warna turun 92,8% (12,73 TCU), kekeruhan turun sebesar 85,47% (5,23 NTU), pH air meningkat sebesar 83,75% (6,56) dan kadar besi (Fe) turun sebesar 88,53% ( 0,367 mg/l).
Dengan demikian bagi masyarakat di Desa Gosong Telaga Barat diharapkan agar menggunakan koagulan larutan serbuk kulit kerang sebagai alternatif untuk memperbaiki kualitas air rawa sumur gali dan mendapatkan air yang memenuhi syarat kesehatan.
Kata Kunci : Kualitas Air Rawa, Koagulasi Larutan Serbuk Kulit Kerang
ii ABSTRACT
Water is a very important chemical compound for the life of living creature. The result of feasibility survey in Desa Gosong Telaga Barat, Singkil Utara subdistrict, Aceh Singkil District showed that the brackish water of dug wells contained high color level of 176 TCU, turbidity of 36 NTU, pH 3,57, and iron content (Fe) 3,2 mg/l. Not only does this chemical compound cause health problem but also stinks as well as yellow color on the tub wall, on the bathroom floor, and yellow spots on the clothes.
The purpose of this study was to find out the difference of color level, turbidity, pH and Fe content in the brackish water of dug wells before and after undergoing coagulation water treatmentusing a solution of powdered shells as coagulation materials.
This quasi-experimental study with randomized-block design was conducted with five concentrations of coagulant dosage and threecycles before and after processing. The object of experiment was the brackish water of dug wells in Desa Gosong Telaga Barat. Sample was taken from 1 (one) dug well through purposive sampling technique then the sample was examined before and after treatment.
The conclusion is that after treatment the coagulant dosage is found to be effective at the consentration of 30 ml. The quality of the brackish water of dug wells is improved, the average color parameter decreases by 92,8% (12,73 TCU), the turbidity decreases by 85, 47% (5,23 NTU), water pH increases by 83,75% (6,38) and Fe content decreases by 88,53% (0,367 mg/l).
The communities of Desa Gosong Telaga Barat are expected to use the coagulant made of solution of powdered shells as an alternative to improve the quality of the brackish water of dug wells and to get the water that meets health requirements.
Keywords: Quality of Brackish Water, Coagulation, Solution of Powdered Shells
