Affiliation:
1. Department of Civil Engineering, University of Victoria, 3800 Finnerty Rd, Victoria, BC V8P 5C2, Canada
Abstract
Abstract
In a recent contribution by Curry and colleagues, a field-derived assessment of a reportedly common pretreatment technique to reduce turbidities of biosand filter (BSF) feed water was reported. Their results demonstrated that despite alum pretreatment achieving lower settled turbidity values relative to control filters, such intervention led to significantly lower flow rates in the alum-dosed BSFs. However, their study stopped short of providing a more meaningful interpretation to what may initially seem like a counterintuitive finding, which is presented here.
Subject
Public Health, Environmental and Occupational Health,Pollution,Waste Management and Disposal,Water Science and Technology,Development
Reference5 articles.
1. Impact of rock alum pretreatment on biosand filter performance in Cambodia;Journal of Water, Sanitation and Hygiene for Development,2020
2. Aluminium residuals in emergency water treatment: what you wanted to know, but never asked;Waterlines,2009
3. Slow sand filtration pre-treatment with alum is efficient, but is it effective?;Journal of Water, Sanitation and Hygiene for Development,2013
4. Chemically enhanced gravel pre-filtration for slow sand filters: advantages and pitfalls;Water Science and Technology: Water Supply,2006
5. Impacts of chemical pre-treatment on slow sand filtration;Gimbel,2006