Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/acsestwater.3c00456
Lizenz creative commons licence
Titel (primär) Retention of organic micropollutants in nutrient recovery from centrate by electrodialysis─Influence of feed pH and current density
Autor Genz, P.; Katayama, V.T.; Reemtsma, T.
Quelle ACS Environmental Science and Technology Water
Erscheinungsjahr 2023
Department ANA
Band/Volume 3
Heft 12
Seite von 4066
Seite bis 4073
Sprache englisch
Topic T9 Healthy Planet
Supplements https://ndownloader.figstatic.com/files/43054047
Keywords sludge liquor; trace contaminants; wastewater reuse; overlimiting current density
Abstract Electrodialysis is an attractive option for nutrient recovery from wastewaters like centrate, from dewatering of digested activated sludge, but cotransport of micropollutants may limit its benefit. The retention of 13 small and partly ionic micropollutants by electrodialysis was studied. All but three showed an elimination >90%. Modification of feed pH and current density were tested to improve retention. Neutral compounds like carbamazepine are retained nearly completely, independent of feed pH. Surprisingly, the retention of ionizable compounds remained unaffected by the modified feed pH despite a pK value in the investigated pH range. In synthetic feed, transport for small, ionizable compounds such as metformin or acesulfame reached up to 60% of the transport of inorganic ions. However, during treatment of centrate, cotransport of micropollutants did not exceed 30%. Moreover, in experiments at overlimiting current density, cotransport of micropollutants increased by a factor of 1.2–6 compared to underlimiting current density. This study outlines that electrodialysis effectively retains most polar organic micropollutants. However, for small, ionizable micropollutants, retention can be lower and depends on the applied current density. Increased cotransport of micropollutants should be considered when using overlimiting current densities to optimize current efficiency of nutrient recovery with electrodialysis.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=28061
Genz, P., Katayama, V.T., Reemtsma, T. (2023):
Retention of organic micropollutants in nutrient recovery from centrate by electrodialysis─Influence of feed pH and current density
ACS ES&T Water 3 (12), 4066 - 4073 10.1021/acsestwater.3c00456