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Arsenate Removal by Coagulation Using Iron Salts and Organic Polymers

Arsenate Removal by Coagulation Using Iron Salts and Organic Polymers,10.5053/ekoloji.2010.7410,Ekoloji,Meltem BİLİCİ BAŞKAN,Ayşegül PALA,Ayşen TÜRKMA

Arsenate Removal by Coagulation Using Iron Salts and Organic Polymers   (Citations: 1)
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Arsenic occurs naturally in the water in many parts of the world. The coagulation and flocculation method is used for arsenate removal from drinking water using ferric chloride, ferric sulfate, and ferrous sulfate. The effects of coagulant type and dosage on removal efficiency of arsenate are determined by considering the residual iron after sedimentation and filtration in the effluent. At the same time the impact of the type (cationic, anionic, and nonionic) and dosage of organic polymers on the removal efficiency of arsenate was investigated. Residual arsenate concentrations were decreased below 10 mg L-1 for ferric chloride and ferrous sulfate concentration of 30 and 80 mg L -1 , respectively. Ferric chloride provided minimum and acceptable residual iron concentration (175 mg L-1) after sedimentation and filtration and it was determined as the most effective and economic coagulant type because it requires lower amounts than the others and produces minimum residual iron. The addition of cationic polyelectrolyte aided maximum arsenate removal efficiency although all types of polymers increased the efficiency of the treatment method. The percentage of removal reached a maximum level at the cationic polyelectrolyte concentration of 2.5, 2, and 3 mg L-1 for ferric chloride, ferric sulfate, and ferrous sulfate, respectively. Arsenik dünyanýn birçok bölgesinde doðal olarak suda bulunan bir elementtir. Bu çalýþmada içme sularýndan arsenat giderimi için koagülant olarak demir klorür, demir(II) sülfat ve demir(III) sülfatýn denendiði koagülasyon ve flokülasyon yöntemi kullanýlmýþtýr. Arýtmadan sonra suda kalan demir konsantrasyonu da göz önünde bulundurularak, arsenat giderme verimi üzerine koagülant türü ve dozunun etkisi araþtýrýlmýþtýr. Ayný zamanda kullanýlan organik polimerlerin türünün (katyonik, anyonik ve noniyonik) ve dozunun da arsenat giderme verimi üzerine etkisi belirlenmiþtir. Arýtmadan sonra suda kalan arsenat konsantrasyonu demir klorür için 30 mg L -1 , demir(II) sülfat için ise 80 mg L -1 konsantrasyonlarda 10 μg L-1'nin altýna düþürülebilmiþtir. Daha az miktarda kullanýlmasý ve arýtmadan sonra suda kalan minimum demir konsantrasyonunu (175 mg L-1) saðlamasý açýsýndan demir klorür en etkili ve ekonomik koagülant türü olarak belirlenmiþtir. Kullanýlan tüm organik polimer türleri arsenat giderme verimini bir miktar arttýrmasýna raðmen maksimum arsenat giderme verimi katyonik polielektrolit ilavesi ile saðlanmýþtýr. Demir klorür ile 2.5, demir(III) sülfat ile 2 ve demir(II) sülfat ile 3 mg L -1 katyonik
Journal: Ekoloji , vol. 74, no. 19, pp. 69-76, 2010
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