Impact of phosphate, silicate and natural organic matter on the size of Fe(III) precipitates and arsenate co-precipitation efficiency in calcium containing water

Arslan Ahmad*, Sam Rutten, Martijn Eikelboom, Luuk de Waal, Harry Bruning, Prosun Bhattacharya, Albert van der Wal

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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.

Original languageEnglish
Article number116117
JournalSeparation and Purification Technology
Volume235
DOIs
Publication statusPublished - 18 Mar 2020

Fingerprint

Silicates
Arsenic
Coprecipitation
Biological materials
Precipitates
Calcium
Phosphates
Water
Water treatment plants
arsenic acid
Water treatment
Oxides
Water quality
Adsorption
Chemical analysis

Keywords

  • Arsenic removal
  • Drinking water
  • Ferric chloride (FeCl)
  • Groundwater treatment
  • Natural organic matter (NOM)

Cite this

@article{331916221fec44188b0d6e23f51b9458,
title = "Impact of phosphate, silicate and natural organic matter on the size of Fe(III) precipitates and arsenate co-precipitation efficiency in calcium containing water",
abstract = "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.",
keywords = "Arsenic removal, Drinking water, Ferric chloride (FeCl), Groundwater treatment, Natural organic matter (NOM)",
author = "Arslan Ahmad and Sam Rutten and Martijn Eikelboom and {de Waal}, Luuk and Harry Bruning and Prosun Bhattacharya and {van der Wal}, Albert",
year = "2020",
month = "3",
day = "18",
doi = "10.1016/j.seppur.2019.116117",
language = "English",
volume = "235",
journal = "Separation and Purification Technology",
issn = "1383-5866",
publisher = "Elsevier",

}

Impact of phosphate, silicate and natural organic matter on the size of Fe(III) precipitates and arsenate co-precipitation efficiency in calcium containing water. / Ahmad, Arslan; Rutten, Sam; Eikelboom, Martijn; de Waal, Luuk; Bruning, Harry; Bhattacharya, Prosun; van der Wal, Albert.

In: Separation and Purification Technology, Vol. 235, 116117, 18.03.2020.

Research output: Contribution to journalArticleAcademicpeer-review

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

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)

U2 - 10.1016/j.seppur.2019.116117

DO - 10.1016/j.seppur.2019.116117

M3 - Article

VL - 235

JO - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

M1 - 116117

ER -