Enhanced filter performance by fluidized-bed pretreatment with Al(OH)3(am): Observations and model simulation

Po Hsun Lin, Leonard W. Lion, Monroe L. Weber-Shirk

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Fluidized-bed pretreatment of a rapid sand filter with alum [Al 2(SO4)314H2O] has been shown to significantly improve performance during the initial portion of filter operation. Two alternative mechanisms are hypothesized by which alum pretreatment acts to improve particle removal: (1)Al(OH)3(am) coats the sand filter medium, and alters its porosity. (2)Precipitated Al(OH)3(am) embedded within the media pores acts as an additional filter medium that increases the particle capture efficiency. Conceptual models for these two mechanisms are developed and compared with experimental data for particle removal and head loss. Model predictions indicate that particle removal by filtration through Al(OH)3(am) flocs is the mechanism that significantly enhances the filter performance.

Original languageEnglish
Pages (from-to)419-425
Number of pages7
JournalJournal of Environmental Engineering
Volume138
Issue number4
DOIs
StatePublished - Apr 2012

Keywords

  • Alum
  • Filters
  • Fluidized bed technology
  • Fluidized-bed pretreatment
  • Rapid sand filter
  • Ripening
  • Simulation
  • Waste treatment

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