ABSTRACT: Fly ash is an ash
with smooth granular shape and black grey color. It is a waste material
produced from the burning of coal. The contain of fly ash especially is silica
and alumina that it can be used as adsorbent. As adsorbent, fly ash as used to
decrease water hardness at Darmakradenan Village, Ajibarang District. The
result showed that the porosity of fly ash was 13.6056%, the water content was
0.055%, adsorption capacity of iodium was 216.8975 mg/g, and adsorption
capacity of methylen blue was 0,3891 mg/g. Fly ash could decrease total water
hardness. The adsorption rise when contact time was added. Adsorption reached
equilibrium at contact time 120 minutes with decreasion percentage 63.6363%.
Keywords: fly ash, adsorption,
water hardness
Penulis: Senny Widyaningsih,
Ely Setiawan, Tien Setyaningtyas
Kode Jurnal: jpkimiadd110039
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