|Publisher DOI:||10.3390/su9040590||Title:||Use of novel composite coagulants for arsenic removal from waters : experimental insight for the application of polyferric sulfate (PFS)||Language:||English||Authors:||Katsoyiannis, Ioannis A.
Tzollas, Nikolaos M.
Tolkou, Athanasia K.
Zouboulis, Anastasios I.
|Keywords:||arsenic removal;composite inorganic coagulants;poly-ferric-sulfate;alkalinity||Issue Date:||12-Apr-2017||Publisher:||Multidisciplinary Digital Publishing Institute||Source:||Sustainability 9 (2017), 4: 590||Journal or Series Name:||Sustainability||Abstract (english):||In the present study, several pre-polymerized coagulants of iron and aluminum were tested for their efficiency towards As(V) and As(III) removal from water sources. The results showed that the pre-polymerized coagulants of iron, such as poly-ferric sulfate and poly-ferric silicate chloride, were very efficient for As(V) removal. With regard to As(III) removal, among all examined coagulants, including the conventional ferric chloride, only the poly-ferric sulfate (PFS) was able to reduce As(III) to concentrations below the drinking water regulation limit of 10 μg/L. In contrast, all tested composite coagulants based on aluminum were not capable of removing efficiently both species of arsenic. PFS addition in water containing 4 mM of alkalinity and 25 μg/L of As(V) and As(III) (i.e., total arsenic concentration 50 μg/L) resulted in finished water with less than 5 μg/L arsenic, only by dosing 5 mg Fe-PFS/L at pH 7, whereas, simultaneously, the residual iron concentration was found well below its drinking water regulation limit of 200 μg/L. The use of PFS could provide a viable alternative for As(III) and As(V) removal at household treatment level for application in vulnerable communities, without the need of any additional treatment, such as oxidation of As(III) to As(V).||URI:||http://tubdok.tub.tuhh.de/handle/11420/1422||DOI:||10.15480/882.1419||ISSN:||2071-1050||Other Identifiers:||doi: 10.3390/su9040590||Institute:||Wasserressourcen und Wasserversorgung B-11||Type:||(wissenschaftlicher) Artikel||License:||CC BY 4.0 (Attribution)|
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