Strategic phosphate removal/recovery by a re-usable Mg–Fe–Cl layered double hydroxide

S.M. Ashekuzzaman , Jia-Qian Jiang

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Abstract

Excess phosphorus (P) in freshwater bodies is one of the major causes of eutrophication. The regulations for removing phosphate from wastewater treatment plant (WWTP) are becoming more stringent and thus the alternative technologies are sought to enhance the P removal efficiency. In this study, Mg–Fe–Cl based layered double hydroxide (LDH) compounds were synthesized and used for phosphate removal. Implementing LDH as a tertiary treatment process for the removal and recovery of phosphate is proposed. Results show that LDH dosage of 2 g/l can reduce phosphate concentration down to 0.1 mg/l from an initial value of 10 mg/l at an equilibrium contact time of 2 and 3 h, respectively. The adsorption kinetics of phosphate onto Mg–Fe–Cl LDH is well governed by the pseudo-second-order kinetic model, and adsorption data fit well to the Langmuir and Freundlich isotherms. The study on pH effect of adsorbate solution suggested that pH range between 3–7.5 is suitable for unaffected phosphate removal. The repeated use of this LDH by both batch and fixed bed column experiment showed that total phosphate reduction was about 95% and desorption percentage was about 91% through six cycles of adsorption–desorption processes. It is likely that this LDH compounds can be applied to remove and recover phosphate from secondary effluent of domestic wastewater treatment plant and thereby, to meet future stringent discharge regulations.
Original languageEnglish
Pages (from-to)454–462
Number of pages9
JournalProcess Safety and Environmental Protection
Volume107
Early online date12 Mar 2017
DOIs
Publication statusPublished - Apr 2017

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hydroxide
Phosphates
phosphate
Recovery
Wastewater treatment
adsorption
kinetics
pH effects
Adsorption
Kinetics
Eutrophication
phosphate removal
hydroxide ion
eutrophication
desorption
isotherm
Adsorbates
Phosphorus
effluent
phosphorus

Keywords

  • phosphate recovery
  • double hydroxide
  • freshwater

Cite this

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title = "Strategic phosphate removal/recovery by a re-usable Mg–Fe–Cl layered double hydroxide",
abstract = "Excess phosphorus (P) in freshwater bodies is one of the major causes of eutrophication. The regulations for removing phosphate from wastewater treatment plant (WWTP) are becoming more stringent and thus the alternative technologies are sought to enhance the P removal efficiency. In this study, Mg–Fe–Cl based layered double hydroxide (LDH) compounds were synthesized and used for phosphate removal. Implementing LDH as a tertiary treatment process for the removal and recovery of phosphate is proposed. Results show that LDH dosage of 2 g/l can reduce phosphate concentration down to 0.1 mg/l from an initial value of 10 mg/l at an equilibrium contact time of 2 and 3 h, respectively. The adsorption kinetics of phosphate onto Mg–Fe–Cl LDH is well governed by the pseudo-second-order kinetic model, and adsorption data fit well to the Langmuir and Freundlich isotherms. The study on pH effect of adsorbate solution suggested that pH range between 3–7.5 is suitable for unaffected phosphate removal. The repeated use of this LDH by both batch and fixed bed column experiment showed that total phosphate reduction was about 95{\%} and desorption percentage was about 91{\%} through six cycles of adsorption–desorption processes. It is likely that this LDH compounds can be applied to remove and recover phosphate from secondary effluent of domestic wastewater treatment plant and thereby, to meet future stringent discharge regulations.",
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Strategic phosphate removal/recovery by a re-usable Mg–Fe–Cl layered double hydroxide. / Ashekuzzaman , S.M. ; Jiang, Jia-Qian.

In: Process Safety and Environmental Protection, Vol. 107, 04.2017, p. 454–462.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Ashekuzzaman , S.M.

AU - Jiang, Jia-Qian

N1 - Acceptance date from journal webpage AAM: 12m embargo

PY - 2017/4

Y1 - 2017/4

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AB - Excess phosphorus (P) in freshwater bodies is one of the major causes of eutrophication. The regulations for removing phosphate from wastewater treatment plant (WWTP) are becoming more stringent and thus the alternative technologies are sought to enhance the P removal efficiency. In this study, Mg–Fe–Cl based layered double hydroxide (LDH) compounds were synthesized and used for phosphate removal. Implementing LDH as a tertiary treatment process for the removal and recovery of phosphate is proposed. Results show that LDH dosage of 2 g/l can reduce phosphate concentration down to 0.1 mg/l from an initial value of 10 mg/l at an equilibrium contact time of 2 and 3 h, respectively. The adsorption kinetics of phosphate onto Mg–Fe–Cl LDH is well governed by the pseudo-second-order kinetic model, and adsorption data fit well to the Langmuir and Freundlich isotherms. The study on pH effect of adsorbate solution suggested that pH range between 3–7.5 is suitable for unaffected phosphate removal. The repeated use of this LDH by both batch and fixed bed column experiment showed that total phosphate reduction was about 95% and desorption percentage was about 91% through six cycles of adsorption–desorption processes. It is likely that this LDH compounds can be applied to remove and recover phosphate from secondary effluent of domestic wastewater treatment plant and thereby, to meet future stringent discharge regulations.

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