Production of a new wastewater treatment coagulant from fly ash with concomitant flue gas scrubbing.
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, SO(2) 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 SO(2) was influenced by temperature, SO(2) 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.
Li
Ling
L
Department of Civil and Environmental Engineering, Iowa State University, Ames, IA 50011, United States.
Fan
Maohong
M
Brown
Robert C
RC
Koziel
Jacek A
JA
van Leeuwen
J Hans
JH
D002244:Carbon; D060729:Coal Ash; D005740:Gases; D007220:Industrial Waste; D008855:Microscopy, Electron, Scanning; D052638:Particulate Matter; D014873:Water Pollutants
D060729:Coal Ash; D005740:Gases; D007220:Industrial Waste; D052638:Particulate Matter; D014873:Water Pollutants; D002244:Carbon