Addressing harmful algal blooms (HABs) impacts with ferrate(VI)

Simultaneous removal of algal cells and toxins for drinking water treatment

Yang Deng, Meiyin S Wu, Huiqin Zhang, Lei Zheng, Yaritza Acosta, Tsung Ta D. Hsu

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

Although ferrate(VI) has long been recognized as a multi-purpose treatment agent, previous investigations regarding ferrate(VI) for addressing harmful algal blooms (HABs) impacts in drinking water treatment only focused on a single HAB pollutant (e.g. algal cells or algal toxins). Moreover, the performance of ferrate(VI)-driven coagulation was poorly investigated in comparison with ferrate(VI) oxidation, though it has been widely acknowledged as a major ferrate(VI) treatment mechanism. We herein reported ferrate(VI) as an emerging agent for simultaneous and effective removal of algal cells and toxins in a simulated HAB-impacted water. Ferrate(VI)-driven oxidation enabled algal cell inactivation and toxin decomposition. Subsequently, Fe(III) from ferrate(VI) reduction initiated an in-situ coagulation for cell aggregation. Cell viability (initial 4.26 × 104 cells/mL at pH 5.5 and 5.16 × 104 cells/mL at pH 7.5) decreased to 0.0% at ≥ 7 mg/L Fe(VI) at pH 5.5 and 7.5, respectively. Cell density and turbidity were dramatically decreased at pH 5.5 once ferrate(VI) doses were beyond their respective threshold levels, which are defined as minimum effective iron doses (MEIDs). However, the particulate removal at pH 7.5 was poor, likely because the coagulation was principally driven by charge neutralization and a higher pH could not sufficiently lower the particle surface charge. Meanwhile, algal toxins (i.e., microcystins) of 3.98 μg/L could be substantially decomposed at either pH. And the greater degradation achieved at pH 5.5 was due to the higher reactivity of ferrate(VI) at the lower pH. This study represents the first step toward the ferrate(VI) application as a promising approach for addressing multiple HABs impacts for water treatment.

Original languageEnglish
Pages (from-to)757-761
Number of pages5
JournalChemosphere
Volume186
DOIs
StatePublished - 1 Jan 2017

Fingerprint

Water treatment
Drinking Water
toxin
algal bloom
coagulation
oxidation
Coagulation
neutralization
turbidity
water treatment
viability
decomposition
iron
degradation
removal
drinking water treatment
ferrate ion
pollutant
Microcystins
Oxidation

Keywords

  • Algal cells
  • Algal toxins
  • Chemical oxidation
  • Coagulation
  • Drinking water treatment
  • Ferrate(VI)

Cite this

@article{db1e2ed526524859a169c40e4c1e34f5,
title = "Addressing harmful algal blooms (HABs) impacts with ferrate(VI): Simultaneous removal of algal cells and toxins for drinking water treatment",
abstract = "Although ferrate(VI) has long been recognized as a multi-purpose treatment agent, previous investigations regarding ferrate(VI) for addressing harmful algal blooms (HABs) impacts in drinking water treatment only focused on a single HAB pollutant (e.g. algal cells or algal toxins). Moreover, the performance of ferrate(VI)-driven coagulation was poorly investigated in comparison with ferrate(VI) oxidation, though it has been widely acknowledged as a major ferrate(VI) treatment mechanism. We herein reported ferrate(VI) as an emerging agent for simultaneous and effective removal of algal cells and toxins in a simulated HAB-impacted water. Ferrate(VI)-driven oxidation enabled algal cell inactivation and toxin decomposition. Subsequently, Fe(III) from ferrate(VI) reduction initiated an in-situ coagulation for cell aggregation. Cell viability (initial 4.26 × 104 cells/mL at pH 5.5 and 5.16 × 104 cells/mL at pH 7.5) decreased to 0.0{\%} at ≥ 7 mg/L Fe(VI) at pH 5.5 and 7.5, respectively. Cell density and turbidity were dramatically decreased at pH 5.5 once ferrate(VI) doses were beyond their respective threshold levels, which are defined as minimum effective iron doses (MEIDs). However, the particulate removal at pH 7.5 was poor, likely because the coagulation was principally driven by charge neutralization and a higher pH could not sufficiently lower the particle surface charge. Meanwhile, algal toxins (i.e., microcystins) of 3.98 μg/L could be substantially decomposed at either pH. And the greater degradation achieved at pH 5.5 was due to the higher reactivity of ferrate(VI) at the lower pH. This study represents the first step toward the ferrate(VI) application as a promising approach for addressing multiple HABs impacts for water treatment.",
keywords = "Algal cells, Algal toxins, Chemical oxidation, Coagulation, Drinking water treatment, Ferrate(VI)",
author = "Yang Deng and Wu, {Meiyin S} and Huiqin Zhang and Lei Zheng and Yaritza Acosta and Hsu, {Tsung Ta D.}",
year = "2017",
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language = "English",
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Addressing harmful algal blooms (HABs) impacts with ferrate(VI) : Simultaneous removal of algal cells and toxins for drinking water treatment. / Deng, Yang; Wu, Meiyin S; Zhang, Huiqin; Zheng, Lei; Acosta, Yaritza; Hsu, Tsung Ta D.

In: Chemosphere, Vol. 186, 01.01.2017, p. 757-761.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Addressing harmful algal blooms (HABs) impacts with ferrate(VI)

T2 - Simultaneous removal of algal cells and toxins for drinking water treatment

AU - Deng, Yang

AU - Wu, Meiyin S

AU - Zhang, Huiqin

AU - Zheng, Lei

AU - Acosta, Yaritza

AU - Hsu, Tsung Ta D.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Although ferrate(VI) has long been recognized as a multi-purpose treatment agent, previous investigations regarding ferrate(VI) for addressing harmful algal blooms (HABs) impacts in drinking water treatment only focused on a single HAB pollutant (e.g. algal cells or algal toxins). Moreover, the performance of ferrate(VI)-driven coagulation was poorly investigated in comparison with ferrate(VI) oxidation, though it has been widely acknowledged as a major ferrate(VI) treatment mechanism. We herein reported ferrate(VI) as an emerging agent for simultaneous and effective removal of algal cells and toxins in a simulated HAB-impacted water. Ferrate(VI)-driven oxidation enabled algal cell inactivation and toxin decomposition. Subsequently, Fe(III) from ferrate(VI) reduction initiated an in-situ coagulation for cell aggregation. Cell viability (initial 4.26 × 104 cells/mL at pH 5.5 and 5.16 × 104 cells/mL at pH 7.5) decreased to 0.0% at ≥ 7 mg/L Fe(VI) at pH 5.5 and 7.5, respectively. Cell density and turbidity were dramatically decreased at pH 5.5 once ferrate(VI) doses were beyond their respective threshold levels, which are defined as minimum effective iron doses (MEIDs). However, the particulate removal at pH 7.5 was poor, likely because the coagulation was principally driven by charge neutralization and a higher pH could not sufficiently lower the particle surface charge. Meanwhile, algal toxins (i.e., microcystins) of 3.98 μg/L could be substantially decomposed at either pH. And the greater degradation achieved at pH 5.5 was due to the higher reactivity of ferrate(VI) at the lower pH. This study represents the first step toward the ferrate(VI) application as a promising approach for addressing multiple HABs impacts for water treatment.

AB - Although ferrate(VI) has long been recognized as a multi-purpose treatment agent, previous investigations regarding ferrate(VI) for addressing harmful algal blooms (HABs) impacts in drinking water treatment only focused on a single HAB pollutant (e.g. algal cells or algal toxins). Moreover, the performance of ferrate(VI)-driven coagulation was poorly investigated in comparison with ferrate(VI) oxidation, though it has been widely acknowledged as a major ferrate(VI) treatment mechanism. We herein reported ferrate(VI) as an emerging agent for simultaneous and effective removal of algal cells and toxins in a simulated HAB-impacted water. Ferrate(VI)-driven oxidation enabled algal cell inactivation and toxin decomposition. Subsequently, Fe(III) from ferrate(VI) reduction initiated an in-situ coagulation for cell aggregation. Cell viability (initial 4.26 × 104 cells/mL at pH 5.5 and 5.16 × 104 cells/mL at pH 7.5) decreased to 0.0% at ≥ 7 mg/L Fe(VI) at pH 5.5 and 7.5, respectively. Cell density and turbidity were dramatically decreased at pH 5.5 once ferrate(VI) doses were beyond their respective threshold levels, which are defined as minimum effective iron doses (MEIDs). However, the particulate removal at pH 7.5 was poor, likely because the coagulation was principally driven by charge neutralization and a higher pH could not sufficiently lower the particle surface charge. Meanwhile, algal toxins (i.e., microcystins) of 3.98 μg/L could be substantially decomposed at either pH. And the greater degradation achieved at pH 5.5 was due to the higher reactivity of ferrate(VI) at the lower pH. This study represents the first step toward the ferrate(VI) application as a promising approach for addressing multiple HABs impacts for water treatment.

KW - Algal cells

KW - Algal toxins

KW - Chemical oxidation

KW - Coagulation

KW - Drinking water treatment

KW - Ferrate(VI)

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U2 - 10.1016/j.chemosphere.2017.08.052

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JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

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