Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Temperature Effect on Permeate Water in Batch Electrodialysis Reversal

Version 1 : Received: 10 May 2021 / Approved: 12 May 2021 / Online: 12 May 2021 (07:25:01 CEST)

How to cite: Dévora-Isiordia, G.E.; Ayala-Espinoza, A.; Lares-Rangel, L.A. Temperature Effect on Permeate Water in Batch Electrodialysis Reversal. Preprints 2021, 2021050256 (doi: 10.20944/preprints202105.0256.v1). Dévora-Isiordia, G.E.; Ayala-Espinoza, A.; Lares-Rangel, L.A. Temperature Effect on Permeate Water in Batch Electrodialysis Reversal. Preprints 2021, 2021050256 (doi: 10.20944/preprints202105.0256.v1).

Abstract

Currently, a large part of the wells for agricultural use located in the state of Sonora are overexploited, which generates a high degree of saline intrusion and abandonment by nearby communities. In this paper the temperature effect on the final concentration of permeate water was evaluated through voltage and intel concentration variations in a batch electrodialysis reversal process (EDR), in order to identify optimal operating conditions with emphasis on the reduction of energy consumption and cost of desalinated water. Thirty-six samples were prepared: eighteen 2,000 mg/L total dissolved solids (TDS) samples and eighteen 5,000 mg/L TDS samples; brackish well water of 639 mg/L TDS and synthetic salt were mixed to obtain those concentrations. 3 different temperatures (25, 30, 35 °C) and 2 different voltages (10 and 20 V) were tested for each sample. The best salt removal occurred in the 20 V arrays, with 18.34% higher removal for 2,000 mg/L TDS experiments and 25.05% for 5,000 mg/L experiments (average between the 25 to 35 °C tests). Temperature positively affected EDR, especially in the experiments at 10 V voltage, where increasing 10 °C increased its efficiency by 10.83% and 24.69% for 2,000 and 5,000 mg/L TDS, respectively. Energy consumption was lower with increasing temperature (35 °C), as it decreased by 1.405% and 1.613% for 2,000 and 5,000 mg/L TDS concentrations, respectively (average between 10 and 20 V tests), decreasing the cost per m3 of water.

Subject Areas

reversible electrodialysis; water scarcity; process efficiency; temperature effect; voltage

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