Electrodialytic treatment of municipal wastewater and sludge for the removal of heavy metals and recovery of phosphorus

Ebbers, Benjamin; Ottosen, Lisbeth M.; Jensen, Pernille Erland

doi:10.1016/j.electacta.2015.04.097

Cited by 85 publications

(46 citation statements)

References 32 publications

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“…Electro-based technologies, such as electrokinetic and electrodialytic processes, have been the focus of vast environmental remediation research over the last three decades [7,8], both in-situ [9,10], and ex-situ [11,12,13]). Despite such research efforts, the technology readiness level (TRL) for many of those technologies remains very low; although most are considered promising, many are far from being introduced as efficient processes into the market.…”

Section: Introductionmentioning

confidence: 99%

Exploring hydrogen production for self-energy generation in electroremediation: A proof of concept

et al. 2019

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Highlights• Self-produced H2 from electrodialytic treatment of environmental matrices collected • Collected H2 average purity (% mol/mol) of ≈ 98%• A fuel cell used to produce electricity from the self-produced H2 (~1 V)• Experimental self-generated energy promotes savings on electroremediation (≈ 7%) AbstractElectrodialytic technologies are clean-up processes based on the application of a low-level electrical current to produce electrolysis reactions and the consequent electrochemically-induced transport of contaminants. These treatments inherently produce electrolytic hydrogen, an energy carrier, at the cathode compartment, in addition to other cathode reactions. However, exploring this by-product for self-energy generation in electroremediation has never been researched. In this work we present the study of hydrogen production during the electrodialytic treatment of three different environmental matrices (briny water, effluent and mine tailings), at two current intensities (50 and 100 mA). In all cases, hydrogen gas was produced with purities between 73% to 98%, decreasing the electrical costs of the electrodialytic treatment up to ≈ 7%. A protonexchange membrane fuel cell was used to evaluate the possibility to generate electrical energy from the hydrogen production at the cathode, showing a stable output (~1 V) and demonstrating the proof of concept of the process.

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Section: Introductionmentioning

confidence: 99%

Exploring hydrogen production for self-energy generation in electroremediation: A proof of concept

et al. 2019

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“…The major 63 objective with this setup is a simultaneous extraction of P and removal of heavy metals from the liquid 64 with P. When the electrical DC current is applied to the electrodes, the SSA suspension will gradually be acidified due to electrolysis at the anode (H2O → 2H + + ½O2(g) + 2e - was, however, limited by proton leakage through the AEM (Touaibia et al 1996). The two compartment 77 system with the cathode placed in reject water from a WWWT plant and separation of P into the anolyte 78 was tested in (Ebbers et al 2015b), however, the increase in pH caused P precipitation and limited the 79 recovery. A three compartment EDS system based on the idea of recovering phosphoric acid in the 80 anolyte and heavy metals in the catholyte was tested by Ottosen et al (2014) and by Guedes et al (2014).…”

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confidence: 99%

Phosphorous recovery from sewage sludge ash suspended in water in a two-compartment electrodialytic cell

2016

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“…Amongst the contaminants, heavy metals are of special concern due to their potentially negative effects in soils and crops. 4 Among extraction techniques, the electrodialytic (ED) process is pointed out as a feasible technique that has been used to extract phosphorus from a few waste streams: i) wastewater, 5 ii) sewage sludge 6 and their ashes [7][8][9][10][11] and iii) MSW digestate. 12 The principle of this technology has been explained elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Testing new strategies to improve the recovery of phosphorus from anaerobically digested organic fraction of municipal solid waste

Oliveira

Dias-Ferreira

Labrincha

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: This work is focused on phosphorus recovery from anaerobically digested organic fraction of municipal solid waste (referred to as "digestate") as a fertiliser. The main purpose was to propose and test modifications to the electrodialytic process that increase phosphorus extraction, improve the quality of the fertiliser by removing contaminants, and reduce hydraulic retention time to This article is protected by copyright. All rights reserved. allow for smaller system footprints. Strategies tested were: i) lowering the pH of the digestate suspension to below 4.5 using the electrochemical reactions and enhance phosphorus solubilisation from the waste; ii) change the configuration of the electrodialytic cell from 3-to 2-chambers; and iii) stir the sample to shorten the duration of the extraction.RESULTS: Results show that the acidification of digestate by the electrochemical reactions was effective to enhance phosphorus extraction yield. Three-chamber electrodialytic experiments enabled the removal of heavy metals from digestate, producing phosphorus-rich solutions with a low level of metals. This resulted in the production of high quality fertiliser which can be used for agricultural applications. The modification of electrodialytic cell set-up from 3-chamber to 2-chamber did not result in an increase of the phosphorus extraction yields nor did it contribute to the removal of metals from the liquid phase of digestate. The reduction of the hydraulic retention time of electrodialytic extraction of phosphorus from 16d to 9d was attained by the use of stirring and by the electrodialytic acidification.CONCLUSIONS: The increase of phosphorus recovery was accomplished. 90% of phosphorus was successfully extracted from digestate and transformed into struvite.

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Electrodialytic treatment of municipal wastewater and sludge for the removal of heavy metals and recovery of phosphorus

Cited by 85 publications

References 32 publications

Exploring hydrogen production for self-energy generation in electroremediation: A proof of concept

Exploring hydrogen production for self-energy generation in electroremediation: A proof of concept

Phosphorous recovery from sewage sludge ash suspended in water in a two-compartment electrodialytic cell

Testing new strategies to improve the recovery of phosphorus from anaerobically digested organic fraction of municipal solid waste

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