TY - JOUR
T1 - Impact of phosphate, silicate and natural organic matter on the size of Fe(III) precipitates and arsenate co-precipitation efficiency in calcium containing water
AU - Ahmad, Arslan
AU - Rutten, Sam
AU - Eikelboom, Martijn
AU - de Waal, Luuk
AU - Bruning, Harry
AU - Bhattacharya, Prosun
AU - van der Wal, Albert
N1 - Funding Information:
This research is co-financed with PPS -funding from the Topconsortia for Knowledge & Innovation (TKI’s) of the Ministry of Economic Affairs and Climate, The Netherlands. AA acknowledges support from Evides Waterbedrijf. The authors want to thank Wolter Siegers of KWR and Peter Vollaard of Evides for their support during the experiments.
Funding Information:
This research is co-financed with PPS-funding from the Topconsortia for Knowledge & Innovation (TKI's) of the Ministry of Economic Affairs and Climate, The Netherlands. AA acknowledges support from Evides Waterbedrijf. The authors want to thank Wolter Siegers of KWR and Peter Vollaard of Evides for their support during the experiments.
Publisher Copyright:
© 2019 The Authors
PY - 2020/3/18
Y1 - 2020/3/18
N2 - Removal of arsenic (As) from water by co-precipitation with Fe(III) (oxyhydr)oxides is a widely used technique in water treatment. Nevertheless, As removal efficiency appears to be sensitive to the composition of the water matrix. The aim of this study was to gain a deeper understanding of the independent and combined effects of silicate (Si), phosphate (P), natural organic matter (NOM) and calcium (Ca) on arsenate [As(V)] co-precipitation efficiency and the size of Fe(III) precipitates. We found that, in complex solutions, containing multiple solutes and high levels of Ca, (variations in) Si and P concentrations reduce As(V) removal to some extent, mainly due to a decreased adsorption of As(V) onto Fe(III) precipitates. On the other hand, NOM concentrations reduced As(V) removal to a much greater extent, due to possible formation of mobile Fe(III)–NOM complexes that were difficult to remove by filtration. These findings have a great significance for predicting As(V) removal as a function of seasonal and process-related water quality changes at water treatment plants.
AB - Removal of arsenic (As) from water by co-precipitation with Fe(III) (oxyhydr)oxides is a widely used technique in water treatment. Nevertheless, As removal efficiency appears to be sensitive to the composition of the water matrix. The aim of this study was to gain a deeper understanding of the independent and combined effects of silicate (Si), phosphate (P), natural organic matter (NOM) and calcium (Ca) on arsenate [As(V)] co-precipitation efficiency and the size of Fe(III) precipitates. We found that, in complex solutions, containing multiple solutes and high levels of Ca, (variations in) Si and P concentrations reduce As(V) removal to some extent, mainly due to a decreased adsorption of As(V) onto Fe(III) precipitates. On the other hand, NOM concentrations reduced As(V) removal to a much greater extent, due to possible formation of mobile Fe(III)–NOM complexes that were difficult to remove by filtration. These findings have a great significance for predicting As(V) removal as a function of seasonal and process-related water quality changes at water treatment plants.
KW - Arsenic removal
KW - Drinking water
KW - Ferric chloride (FeCl)
KW - Groundwater treatment
KW - Natural organic matter (NOM)
UR - http://www.scopus.com/inward/record.url?scp=85072855348&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2019.116117
DO - 10.1016/j.seppur.2019.116117
M3 - Article
AN - SCOPUS:85072855348
SN - 1383-5866
VL - 235
JO - Separation and purification technology
JF - Separation and purification technology
M1 - 116117
ER -
