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Selective Recovery of Phosphorus from Synthetic Urine Using Flow-Electrode Capacitive Deionization (FCDI)-Based Technology
https://orcid.org/0000-0002-5011-4909
https://orcid.org/0000-0002-8565-0779
Extraction of high-purity phosphate (P) from source-separated urine has attracted growing interest, given its potential economic and environmental benefits. In this study, we present an innovative strategy for selectively separating P from synthetic urine containing a high concentration of Cl–, simply by adjusting the charging and discharging processes of a flow-electrode capacitive deionization (FCDI) unit. During the charging process, both P and Cl– will be transported to the anode chamber and be adsorbed by the charged carbon particles. The inevitable Faradaic reactions induced the generation of H+ and led to the conversion of charged P ions into uncharged H3PO4 and spontaneous desorption into the electrolyte. When the electrode polarity is reversed, constantly charged species like Cl– would be mostly pushed back into the spacer chamber, whereas neutral H3PO4 was expected to be selectively trapped in the anode chamber due to sluggish pH variations (particularly when using a higher carbon content), forming a P-rich solution. Under the optimal operating conditions (i.e., carbon content of 5 wt %, charging and discharging current densities of 10 and −15 A/m2, respectively, and charging and discharging current times of 120 and 30 min, respectively), a stable recovery efficiency (164 mg/L per cycle) and selectivity (ρ > 2, compared to Cl–) of P were attained at a relatively low level of electric energy consumption. Results demonstrated that FCDI could be a promising technology for efficient P removal and recovery from source-separated urine without the consumption of additional chemicals.
The selective recovery of phosphorus (P-rich solution) from urine was achieved using flow-electrode capacitive deionization-based technology by converting phosphate ions into uncharged H3PO4.
Selective Recovery of Phosphorus from Synthetic Urine Using Flow-Electrode Capacitive Deionization (FCDI)-Based Technology
https://orcid.org/0000-0002-5011-4909
https://orcid.org/0000-0002-8565-0779
Extraction of high-purity phosphate (P) from source-separated urine has attracted growing interest, given its potential economic and environmental benefits. In this study, we present an innovative strategy for selectively separating P from synthetic urine containing a high concentration of Cl–, simply by adjusting the charging and discharging processes of a flow-electrode capacitive deionization (FCDI) unit. During the charging process, both P and Cl– will be transported to the anode chamber and be adsorbed by the charged carbon particles. The inevitable Faradaic reactions induced the generation of H+ and led to the conversion of charged P ions into uncharged H3PO4 and spontaneous desorption into the electrolyte. When the electrode polarity is reversed, constantly charged species like Cl– would be mostly pushed back into the spacer chamber, whereas neutral H3PO4 was expected to be selectively trapped in the anode chamber due to sluggish pH variations (particularly when using a higher carbon content), forming a P-rich solution. Under the optimal operating conditions (i.e., carbon content of 5 wt %, charging and discharging current densities of 10 and −15 A/m2, respectively, and charging and discharging current times of 120 and 30 min, respectively), a stable recovery efficiency (164 mg/L per cycle) and selectivity (ρ > 2, compared to Cl–) of P were attained at a relatively low level of electric energy consumption. Results demonstrated that FCDI could be a promising technology for efficient P removal and recovery from source-separated urine without the consumption of additional chemicals.
The selective recovery of phosphorus (P-rich solution) from urine was achieved using flow-electrode capacitive deionization-based technology by converting phosphate ions into uncharged H3PO4.
Selective Recovery of Phosphorus from Synthetic Urine Using Flow-Electrode Capacitive Deionization (FCDI)-Based Technology
https://orcid.org/0000-0002-5011-4909
https://orcid.org/0000-0002-8565-0779
Extraction of high-purity phosphate (P) from source-separated urine has attracted growing interest, given its potential economic and environmental benefits. In this study, we present an innovative strategy for selectively separating P from synthetic urine containing a high concentration of Cl–, simply by adjusting the charging and discharging processes of a flow-electrode capacitive deionization (FCDI) unit. During the charging process, both P and Cl– will be transported to the anode chamber and be adsorbed by the charged carbon particles. The inevitable Faradaic reactions induced the generation of H+ and led to the conversion of charged P ions into uncharged H3PO4 and spontaneous desorption into the electrolyte. When the electrode polarity is reversed, constantly charged species like Cl– would be mostly pushed back into the spacer chamber, whereas neutral H3PO4 was expected to be selectively trapped in the anode chamber due to sluggish pH variations (particularly when using a higher carbon content), forming a P-rich solution. Under the optimal operating conditions (i.e., carbon content of 5 wt %, charging and discharging current densities of 10 and −15 A/m2, respectively, and charging and discharging current times of 120 and 30 min, respectively), a stable recovery efficiency (164 mg/L per cycle) and selectivity (ρ > 2, compared to Cl–) of P were attained at a relatively low level of electric energy consumption. Results demonstrated that FCDI could be a promising technology for efficient P removal and recovery from source-separated urine without the consumption of additional chemicals.
The selective recovery of phosphorus (P-rich solution) from urine was achieved using flow-electrode capacitive deionization-based technology by converting phosphate ions into uncharged H3PO4.
Selective Recovery of Phosphorus from Synthetic Urine Using Flow-Electrode Capacitive Deionization (FCDI)-Based Technology
Xu, Longqian (Autor:in) / Yu, Chao (Autor:in) / Tian, Shiyu (Autor:in) / Mao, Yunfeng (Autor:in) / Zong, Yang (Autor:in) / Zhang, Xiaomeng (Autor:in) / Zhang, Bing (Autor:in) / Zhang, Changyong (Autor:in) / Wu, Deli (Autor:in)
ACS ES&T Water ; 1 ; 175-184
08.01.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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