Demir hidroksitle kolemanit madeni atıksuyundan bor gideriminin full faktöriyel deney tasarımı

Bu çalışmada, jar testi reaktörlerinde demir klorür kullanılarak demir hidroksit üretildi ve bor içeren sentetik çözeltiler ile Kolemanit madeni atık suyundan bor gideriminde kullanıldı. Bor ve demir hidroksit arasındaki denge süresi 32.5 dakika olarak belirlendi. Sentetik çözeltilerde demir hidroksitin bor adsorpsiyon kapasitesindeki değişim; pH (7-10), konsantrasyon (50-250 mg/L), demir klorür miktarı (2.5-10 g) ve sıcaklık (22.5-40 oC) olarak belirlenen parametre aralıklarında araştırıldı. Bor giderimi için optimum pH 7 olarak elde edildi. Bor konsantrasyonundaki artış bor adsorpsiyonunu artırdığından, optimum bor konsantrasyonu 250 mg/L olarak elde edildi. Demir hidroksitin bor adsorpsiyon kapasitesi azalan demir hidroksit dozajı ile arttı. Demir hidroksit üzerine bor adsorpsiyonunun ekzotermik olduğu belirlendi. Sentetik çözeltilerden elde edilen veriler 22 full faktöriyel deney tasarımı kullanılarak kolemanit madeni atık suyuna uygulandı ve faktörler seyreltme (1 ve 10 kat) ve dozaj (5 ve 10 g) olarak alındı. Demir hidroksit ile bor gideriminin optimizasyonu Pareto kartı ile yapıldı. Maksimum kapasite 23.80 mg/g olarak hesaplandı.

Full factorial design of experiments for boron removal by iron hydroxide from colemanite mine wastewater

In this study, iron hydroxide was in-situ generated from iron chloride in the jar test reactors and used for boron removal from both synthetic solutions and colemanite mine wastewater. A time span of 32.5 minutes was enough for equilibrium between boron and iron hydroxide. In the synthetic boron solutions, the variations of boron adsorption capacity of iron hydroxide were investigated by the experimental parameters chosen as pH (7-10), concentration (50-250 mg/L), iron chloride amount (2.5-10 g) and temperature (22.5-40 oC). The optimum pH value for boron removal was determined as 7. Because the higher boron concentrations supported to the boron uptake of iron hydroxide, the optimum boron concentration was 250 mg/L. The boron uptake capacity of iron hydroxide increased with decreasing iron chloride dosage. The boron adsorption onto the iron hydroxide was an exothermic process. The optimum conditions obtained from the synthetic solution experiments were applied to the colemanite mine wastewater by 22 full factorial experimental design of factors which were dilution (1 and 10 fold) and iron chloride amount (5 and 10 g). The optimization of boron removal by iron hydroxide was realized by analyzing Pareto chart. Maximum capacity was calculated as 23.80 mg/g.

Keywords:

Boron removal, colemanite mine wastewater full factorial design, iron hydroxide,

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