Production of a new wastewater treatment coagulant from fly ash with concomitant flue gas scrubbing

Brown, Robert
Koziel, Jacek
Li, Ling
Fan, Maohong
Brown, Robert
Koziel, Jacek
van Leeuwen, Johannes
van Leeuwen, Johannes
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The research focused on the production of a complex wastewater coagulant containing polymeric sulfates of aluminum and iron from fly ash. At the same time, SO2 in the simulated flu gas was removed by absorption in a fly ash slurry and oxidized with sodium chlorate. Extraction efficiency of iron and aluminum oxides from fly ash was affected greatly by reaction temperature and time. The extraction efficiency increases as temperature increases. Removal efficiency of SO2 was influenced by temperature, SO2 feed concentration and feed gas dispersing method. The produced complex coagulant containing both polymeric ferric sulfate (PFS) and polymeric aluminum sulfate (PAS) was proven to be effective in removing total suspended solids (TSS) and turbidity in wastewater. The complex coagulant is more effective than conventional iron and aluminum sulfates in turbidity removal.

<p>This is a manuscript of an article published as Li, Ling, Maohong Fan, Robert C. Brown, Jacek A. Koziel, and J. Hans van Leeuwen. "Production of a new wastewater treatment coagulant from fly ash with concomitant flue gas scrubbing." <em>Journal of Hazardous Materials</em> 162, no. 2-3 (2009): 1430-1437. DOI: <a href="" target="_blank">10.1016/j.jhazmat.2008.06.035</a>. Posted with permission.</p>
Fly ash, SO2 removal, Coagulant, Wastewater treatment