Ammonium removal and recovery from real digestate wastewater by a modified operational method of membrane capacitive deionization unit

Sakar, Hacer; Celik, Isıl; Balcik‐Canbolat, Cigdem; Keskinler, Bülent; Karagündüz, Ahmet

doi:10.1016/j.jclepro.2019.01.165

Cited by 38 publications

(14 citation statements)

References 36 publications

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“…1 B and C ). Though there are several experimental studies ( 67 – 76 ), no theory has yet been developed to predict and guide the removal of such species by CDI. However, given the complexities involving pH dynamics in CDI, a validated model is essential to unlock the enormous potential of CDI to remove amphoteric ions without the need for chemical additives to adjust feed pH.…”

mentioning

confidence: 99%

Electrochemical removal of amphoteric ions

Shocron

Guyes

Rijnaarts

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Several harmful or valuable ionic species present in seawater, brackish water, and wastewater are amphoteric, weak acids or weak bases, and, thus, their properties depend on local water pH. Effective removal of these species can be challenging for conventional membrane technologies, necessitating chemical dosing of the feedwater to adjust pH. A prominent example is boron, which is considered toxic in high concentrations and often requires additional membrane passes to remove during seawater desalination. Capacitive deionization (CDI) is an emerging membraneless technique for water treatment and desalination, based on electrosorption of salt ions into charging microporous electrodes. CDI cells show strong internally generated pH variations during operation, and, thus, CDI can potentially remove pH-dependent species without chemical dosing. However, development of this technique is inhibited by the complexities inherent to the coupling of pH dynamics and ion properties in a charging CDI cell. Here, we present a theoretical framework predicting the electrosorption of pH-dependent species in flow-through electrode CDI cells. We demonstrate that such a model enables insight into factors affecting species electrosorption and conclude that important design rules for such systems are highly counterintuitive. For example, we show both theoretically and experimentally that for boron removal, the anode should be placed upstream and the cathode downstream, an electrode order that runs counter to the accepted wisdom in the CDI field. Overall, we show that to achieve target separations relying on coupled, complex phenomena, such as in the removal of amphoteric species, a theoretical CDI model is essential.

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mentioning

confidence: 99%

Electrochemical removal of amphoteric ions

Shocron

Guyes

Rijnaarts

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…The recovery of nitrate was 21% from the low salinity wastewater with 48% removed. Sakar, Celik, Balcik-Canbolat, Keskinler, and Karagunduz (2019) examined the treatability and recovery efficiency of ammonium from digestate wastewater through enhanced flowed channel membrane capacitive deionization (fcMCDI). The results showed a 54.4% of ammonium removal efficiency in a single cycle experiment, meanwhile, it also achieved high removal efficiencies of Mg 2+ , Ca 2+ , and K + , which were 90.4%, 85%, and 67.4%, respectively.…”

Section: Annual Literature Reviewmentioning

confidence: 99%

Physico‐chemical processes

Yu¹,

Yao²,

Pan³

et al. 2020

Water Environment Research

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By summarizing 187 relevant research articles published in 2019, the review is focused on the research progress of physicochemical processes for wastewater treatment. This review divides into two sections, physical processes and chemical processes. The physical processes section includes three subsections , that is, adsorption, granular filtration, and dissolved air flotation, whereas the chemical processes section has five subsections , that is, coagulation/flocculation, advanced oxidation processes, electrochemical, capacitive deionization, and ion exchange.

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“…1b-c. Despite the presence of several experimental studies, [67,68,69,70,71,72,73,74,75,76] no theory has been developed to predict and guide the removal of amphoteric species by CDI. Given the complexities involving pH dynamics in CDI, a validated model is essential to unlock the enormous potential of CDI to remove amphoteric ions without chemical additives to adjust feed pH.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical removal of amphoteric ions

Shocron,

Guyes,

Biesheuvel

et al. 2021

Preprint

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Several harmful or valuable ionic species present in sea, brackish and wastewaters are amphoteric, and thus their properties depend on the local water pH. Effective removal of these species can be challenging by conventional membrane technologies, necessitating chemical dosing of the feedwater to adjust its pH. Capacitive deionization (CDI) is an emerging membraneless technique for water treatment and desalination, based on electrosorption of salt ions into charging microporous electrodes. CDI cells show strong internally-generated pH variations during operation, and thus CDI can potentially remove amphoteric species without chemical dosing. However, development of this technique is inhibited by the complexities inherent to coupling of pH dynamics and amphoteric ion properties in a charging CDI cell. Here, we present a novel theoretical framework predicting the electrosorption of amphoteric species in flow-through electrode CDI cells. We demonstrate that such a model enables deep insight into factors affecting amphoteric species electrosorption, and conclude that important design rules for such systems are highly counter-intuitive. For example, we show both theoretically and experimentally that for boron removal the anode should be placed upstream, which runs counter to accepted wisdom in the CDI field. Overall, we show that to achieve target separations relying on coupled, complex phenomena, such as in the removal of amphoteric species, a theoretical CDI model is essential.

show abstract

Ammonium removal and recovery from real digestate wastewater by a modified operational method of membrane capacitive deionization unit

Cited by 38 publications

References 36 publications

Electrochemical removal of amphoteric ions

Electrochemical removal of amphoteric ions

Physico‐chemical processes

Electrochemical removal of amphoteric ions

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