American Society of Civil Engineers (ASCE);Reston, VA: American Society of Civil Engineers
摘要:
摘要： AbstractFluidized-bed pretreatment of a rapid sand filter with alum [Al2(SO4)3·14H2O] 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. 出版者： Reston, VA: American Society of Civil Engineers 出版日期： 2012-04 出處： Journal of environmental engineering (New York, N.Y.), 2012-04, Vol.138 (4), p.419-425 資源來源： EBSCOhost Business Source Premier 版權： 2012. American Society of Civil Engineers 版權： 2015 INIST-CNRS 識別號： ISSN: 0733-9372 識別號： EISSN: 1943-7870 識別號： DOI: 10.1061/(ASCE)EE.1943-7870.0000493 識別號： CODEN: JOEEDU
