Dataset Information

Separation and Concentration of Nitrogen and Phosphorus in a Bipolar Membrane Electrodialysis System.

ABSTRACT: Struvite crystallization is a successful technique for simultaneously recovering PO₄³^- and NH₄⁺ from wastewater. However, recovering PO₄³^- and NH₄⁺ from low-concentration solutions is challenging. In this study, PO₄³^-, NH₄⁺, and NO₃^- were separated and concentrated from wastewater using bipolar membrane electrodialysis, PO₄³^- and NH₄⁺ can then be recovered as struvite. The separation and concentration of PO₄³^- and NH₄⁺ are clearly impacted by current density, according to experimental findings. The extent of separation and migration rate increased with increasing current density. The chemical oxygen demand of the feedwater has no discernible impact on the separation and recovery of ions. The migration of PO₄³^-, NH₄⁺, and NO₃^- fits zero-order migration kinetics. The concentrated concentration of NH₄⁺ and PO₄^3- reached 805 mg/L and 339 mg/L, respectively, which demonstrates that BMED is capable of effectively concentrating and separating PO₄³^- and NH₄⁺. Therefore, BMED can be considered as a pretreatment method for recovering PO₄³^- and NH₄⁺ in the form of struvite from wastewater.

SUBMITTER: Wu X

PROVIDER: S-EPMC9695792 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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Separation and Concentration of Nitrogen and Phosphorus in a Bipolar Membrane Electrodialysis System.

Wu Xiaoyun X Cai Wanling W Fu Yuying Y Liu Yaoxing Y Ye Xin X Qian Qingrong Q Van der Bruggen Bart B

Membranes 20221108 11

Struvite crystallization is a successful technique for simultaneously recovering PO43- and NH4+ from wastewater. However, recovering PO43- and NH4+ from low-concentration solutions is challenging. In this study, PO43-, NH4+, and NO3- were separated and concentrated from wastewater using bipolar membrane electrod ...[more]

PMID: 36363671

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Project description:Electrodialysis (ED) technology for waste acid treatment has high economic efficiency and environmentally friendly advantages. The primary limitation of ED in the retrieval of low-concentration spent acids lies in the leakage of hydrogen ions through anion exchange membranes (AEMs) due to its extremely small size and high mobility. To address this issue, a series of AEMs named QPAB-x (x = 3, 5, 7, 10) were designed for acid concentration in ED process by increasing the membrane densities through in situ crosslinking in this study. The successful synthesis of polymers was confirmed through 1H nuclear magnetic resonance hydrogen (1H NMR) spectroscopy and Attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Furthermore, ATR-FTIR spectroscopy showed that the higher the side chain content, the higher the crosslinking degree of the membranes. X-ray photoelectron spectroscopy (XPS) was employed to characterize the effects of aqueous and acidic environments on QPAB membranes. The performance disparities between QPAB-x membranes in acidic and aqueous environments were examined separately. Subsequently, the influence of crosslinking degree on the acid-blocking capability of the membranes was thoroughly investigated by conducting ED acid-concentration experiments to monitor the hydrogen ions concentration process and determine the current efficiency and energy consumption of the QPAB-x membranes. Our experimental results demonstrated that QPAB-x membranes with higher cross-linking degrees have lower water content, especially the QPAB-10 membrane with an IEC of approximately 1.5 mmol g-1 and a remarkably low water content of around 10%. This leads to a reduced H+ transfer number and excellent acid-blocking properties. Additionally, compared to commercial membrane A2, using the QPAB-10 membrane in the ED process resulted in a higher final H+ concentration in the concentrated chamber. Consequently, these synthesized membranes exhibit considerable promise in the field of ED acid recovery.

Dataset Information

Separation and Concentration of Nitrogen and Phosphorus in a Bipolar Membrane Electrodialysis System.

Publications

Separation and Concentration of Nitrogen and Phosphorus in a Bipolar Membrane Electrodialysis System.

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