Boron Removal From Industrial Waste Waters By Using Aluminum Sulfate Coagulant With Chemical Methods

Abstract

Removal of boron from the industrial waste waters by chemical coagulation methods and effecting

parameters of the process has been investigated by using aluminum sulfate (Al2(SO4)3) as coagulant. Initial boron

concentration, mixing speed, initial pH of the solution and types of the coagulant materials and dosing parameters

had been considered in the boron removal. In the experiments for optimum mixing speeds, 120 rpm was chosen

for the fast mixing speed and 30 rpm was chosen for the slow mixing speed. pH has been found the most important

effecting parameter to the coagulation process. Different coagulant materials and dosing have been applied during

the experimental trials. The highest boron removal yield has been observed in the initial pH values of 7-9 and

it has been determined that increasing the initial concentration of boron has increased the yield. Depending on the

pH values, aluminum sulfate was not effective on the removal yield and it has also been recorded that the boron removal

would be reached within 35%.

Keywords

• Aluminum sulfate (Al2(SO4)3),boron,removal,chemical coagulation

Endüstriyel Atıksulardan Alüminyum Sülfat Koagülantı Kullanılarak Kimyasal Koagülasyon Yöntemi İle Bor Giderimi

Abstract

Dünyada birçok endüstrinin atıksularında sınır değerlerin üstünde bor bulunmaktadır. Bu çalışmada borun endüstriyel atıksulardan kimyasal koagülasyon yöntemi ile giderimi ve bu prosese etki eden çeşitli parametreler incelenmiştir. Denemelerde koagülant olarak alüminyum sülfat kullanılmıştır. Bor gideriminde, başlangıç bor konsantrasyonu, karıştırma hızı, çözeltinin başlangıç pH’sı ve koagülant maddenin cinsi ve dozajı parametreleri incelenmiştir. Optimum karıştırma hızı için yapılan denemelerde, hızlı karıştırma hızı için 120 dev dak-1 ve yavaş karıştırma hızı için 30 dev dak-1 karıştırma hızı olarak seçilmiştir. Kimyasal koagülasyon prosesine etki eden en önemli parametrenin pH olduğu görülmüştür. Proses süresince farklı koagülant maddeleri ve dozajları uygulanmıştır. Çözeltilerin çıkış pH’ları 7-9 arasındaki değerlerde olduğunda, bor giderim veriminin en yüksek olduğu görülmüştür. Başlangıç bor konsantrasyonu artışıyla da bor giderim veriminin arttığı gözlemlenmiştir. Denemeler sonucunda pH’ya bağlı olarak, alüminyum sülfatın, giderim verimi üzerinde etkin olmadığı ve %35’lere kadar bor giderilebileceği görülmüştür

Keywords

• Alüminyum sülfat, bor, giderim, kimyasal koagülasyon

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