Journal
DESALINATION
Volume 507, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2021.114938
Keywords
High-saline papermaking wastewater; Electrodialysis; Bipolar membrane electrodialysis; Zero liquid discharge; Acid-base recovery
Categories
Funding
- National Natural Science Foundation of China [21878273, 21676249]
- Project for Assistance of Qinghai from Science and Technology Department of Zhejiang Province [2018C26004]
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A novel zero liquid discharge technology was developed in this study, combining ED, ECO, RO, and BMED for sustainable recovery of high-saline papermaking wastewater. The process demonstrated efficient COD removal and separation of salts and organics, providing strong technical applicability for sustainable resource recovery from high-saline wastewater.
In this work, a novel zero liquid discharge technology combining of electrodialysis (ED), electrochemical catalytic oxidation (ECO), reserve osmosis (RO) and bipolar membrane electrodialysis (BMED) was developed for sustainable recovery of high-saline papermaking wastewater. The effect of membrane type, volume ratio, membrane fouling and voltage were investigated in ED process; subsequently parameter such as electrolyte conductivity was studied in ECO process. The FKB/FAB stack shows good separation performance for the salts and organics, allowing a relatively high COD rejection of 97.80%. Meanwhile, membrane fouling was investigated through a comparison between virgin and fouled membranes. To achieve a high-saline solution with low organics, a second-stage ED process was applied. The concentration factor was increased to 1.799 with a COD rejection of 96.54% at voltage of 12 V. Simultaneously, the ECO process exhibited superior COD removal of 94.99% at the electrolyte conductivity of 4 mS/cm. Through the application of BMED at V-f:V-b:V-a (volume ratio of feed, base and acid solution) of 4:1:1, the final acid and base content could approach a high value of 12.30 wt% and 10.60 wt%, respectively. Therefore, this hybrid ED-ECO-RO-BMED combined process demonstrates a strongly technical applicability for sustainable resource recovery from high-saline papermaking wastewater.
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