Recovering phosphate and energy from anaerobic sludge digested wastewater with iron-air fuel cells: Two-chamber cell versus one-chamber cell

Wan, Sizhuo; Lai, Lingling; Zhang, Meng; Zeb, Bibi Saima; Mahmood, Qaisar; Tan, Guotao; Yuan, Linjiang

doi:10.1016/j.scitotenv.2022.154034

Cited by 14 publications

(3 citation statements)

References 55 publications

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“…A two-chamber electrolytic cell has been successfully established. Compared with the reported two-compartment fuel cells [32] , this system can achieve rapid and effective removal of phosphorus at different concentrations.Different from the pH control of the single-chamber electrolytic cell [41] ,the twochamber electrolytic cell can maintain the pH of each electrode chamber without additional acid and base input. The experimental results show that the two-chamber electrolytic has a good P recovery potential under different initial P concentration conditions, and can greatly shorten the reaction time.-The characterization of the precipitation shows that the recovered product is mainly vivianite, and the obtained vivianite can be stored stably for a long time.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Crystallization for Phosphate Recovery in the Form of Vivianite by a Two‐Chamber Electrolysis Cell Using Sacrificial Iron Anodes

Song

Chen

Xing³

2023

ChemistrySelect

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A sequencing batch two chamber electrolysis cell was set up to recover phosphate(P) from synthetic wastewater containing KH2PO4 with different gradients.In the cell, ferrous iron goes into the liquor from iron‐anode to precipitate soluble P and form vivianite.The two‐chamber electrolytic cell provides a suitable pH range for the formation of vivianite without adding acid and alkali, which saves costs and avoids waste of resources. After repeated experiments with different gradients, the minimum phosphorus(P) removal efficiency was stably achieved at 97.17 %. After long‐term operation, the P removal effect was not affected despite the fouling of the proton exchange membrane(PEM). Further analysis by XRD, FITR and SEM illustrated that the P recovery precipitated was vivianite.

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Section: Discussionmentioning

confidence: 99%

Electrochemical Crystallization for Phosphate Recovery in the Form of Vivianite by a Two‐Chamber Electrolysis Cell Using Sacrificial Iron Anodes

Song

Chen

Xing³

2023

ChemistrySelect

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“…It can be seen that both the MFCs with electrodes of 64 and 25 cm 2 tend to increase their voltage with the passing of days. Ru et al (2022) refers that the size of the anode is one of the key factors in the efficiency of the MFCs for the production of voltage, that is why the MFCs with larger electrodes generated higher voltage than those with larger electrodes [18].…”

Section: B Construction Of the Microbial Fuel Cellsmentioning

confidence: 99%

Electricity generation and wastewater treatment using microbial fuel cells with graphite and aluminum electrodes

QuiÑones¹,

Coronado²,

Leon³

et al. 2022

Proceedings of the 2nd LACCEI International Multiconference on Entrepreneurship, Innovation and Regional Development (LEIRD 202

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A microbial fuel cell (MFC) is a system that can integrate electricity generation and, at the same time, contribute to decontaminating wastewater, becoming an eco-friendly technology with the environment. In this research, microbial fuel cells with graphite and aluminum electrodes were used at different sizes: 9, 25 and 64 cm 2 , and a wastewater sample obtained from a rural location in Peru was used as substrate. The MFCs parameters of voltage, current and conductivity were monitored for 12 days, for the generation of electricity; and the parameters of Chemical Oxygen Demand (COD), Thermotolerant Coliforms, Turbidity and pH, for wastewater treatment. The MFCs with electrodes of 64 cm 2 were the ones that had the highest efficiency in the production of electricity, because they generated higher voltage, current and conductivitythroughout the days evaluated, with peaks of 0.22 V, 0.08 mA and 1.05 mS/cm, respectively. Likewise, a reduction in the content of COD, Thermotolerant Coliforms and Turbidity of the substrate used (70, 73 and 36%) was achieved, while the pH remained slightly stable, with values from 7.39 to 6.49 during the days evaluated. The MFCs are a promising approach to a sustainable future in which energy can be generated from the use of household wastewater, while simultaneously treating these effluents.

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“…The gradient initial pH was set to 5.4, 5.8, 6.2, 6.6, or 7.0 using 1 M HCl and 1 M NaOH. The concentrations of nitrate and Fe(II) were tested after 24 h. The GaussAmp model (Equation ( 2)) was used to fit the data to determine the optimal initial pH [16]:…”

Section: Effects Of Initial Phmentioning

confidence: 99%

Efficiency Determination and Mechanism Investigation of Autotrophic Denitrification Strain F1 to Promote Low-Carbon Development

Qin

Wan

Liu

et al. 2022

Water

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Shewanella sp. strain F1, isolated from a lab-scale Fe(II)−dependent anaerobic denitrifying reactor, could reduce nitrate by oxidizing Fe(II). Its nitrate reduction rate and Fe(II) oxidation rate were 0.48 mg/(L·h) and 5.05 mg/(L·h) at OD600 of 0.4786 with a five-fold diluent. Shewanella sp. was popular in Fe(III) reduction. Fewer studies about its ability for Fe(II) oxidation are available. The low pH was determined to be the switch for Shewanella sp. strain F1 to perform Fe(III) reduction or Fe(II) oxidation. Even under a low pH, the produced Fe(III) precipitated around cells from iron encrustation. By observation of the morphologies of strain F1, two corresponding microbial mechanisms were proposed. One was named Cyc 2−based Fe(II)-dependent denitrification, in which Fe(II) was oxidized by Cyc 2 in the outer cell membrane, and the produced Fe(III) precipitated on the cell wall surface to form tiled iron encrustation. The other was named Cyc 1−based Fe(II)−dependent denitrification, in which Fe(II) was oxidized on the existing iron precipitation on the cell wall surface to form towery iron encrustation, and the electron was transported to Cyc 1 in the periplasm. The efficiency determination and mechanism investigation of strain F1 will promote the development of autotrophic denitrification technology and meet the requirement of a low−carbon policy.

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Recovering phosphate and energy from anaerobic sludge digested wastewater with iron-air fuel cells: Two-chamber cell versus one-chamber cell

Cited by 14 publications

References 55 publications

Electrochemical Crystallization for Phosphate Recovery in the Form of Vivianite by a Two‐Chamber Electrolysis Cell Using Sacrificial Iron Anodes

Electrochemical Crystallization for Phosphate Recovery in the Form of Vivianite by a Two‐Chamber Electrolysis Cell Using Sacrificial Iron Anodes

Electricity generation and wastewater treatment using microbial fuel cells with graphite and aluminum electrodes

Efficiency Determination and Mechanism Investigation of Autotrophic Denitrification Strain F1 to Promote Low-Carbon Development

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