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The Affects of the Monovalent to Divalent Cation Ratio on Sorption of Estrogens in Biosolids

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Conventional wastewater treatment operations are dependent on the settleability of biosolid flocculates. Past research has shown that biosolid flocculate settleability is dependent on the monovalent to divalent cation ratio (M/D ratio). Natural and synthetic estrogens found in wastewater are primarily removed from the wastewater by sorption into biosolids. This research study focused on the potential effect of the M/D ratio and cationic strength on sorption of estrogenic compounds. The sodium azide isotherm results indicate that the sorption capacity parameter is strongly affected by the M/D ratio and supports the hypothesis that an increase in M/D ratio decreased sorption capacity. However, isotherms performed on live biosolids did not show a clear pattern that supports the hypothesis that the M/D ratio effects sorption capacity. This may be due to the production of colloids by living biosolids or by competitive sorption by other compounds.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708788805224

Publication date: January 1, 2008

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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