Comparison of Microbial Removal Between Slow Dead-End Versus Tangential Sand Filtration

Both river bank filtration and dead-end sand filtration are becoming increasingly applied in rural areas to improve the quality of fecally contaminated water. To evaluate the capacity of both treatments to remove E. coli, fecal streptococci, and somatic and K13-phages, this study investigates their...

Full description

Saved in:
Bibliographic Details
Published in:Water environment research 2018-07, Vol.90 (7), p.589-597
Main Authors: Dizer, Halim, Schmidt, Ralf, Szewzyk, Regine, López-Pila, Juan M.
Format: Article
Language:English
Subjects:
Bacteria
Capacity
Distance
Drinking water
E coli
Filtration
Microorganisms
Phages
Removal
River banks
Riverbanks
Rivers
Rural areas
Sand
Solid suspensions
Suspended particulate matter
Suspended solids
Wastewater
Wastewater dilution
Water depth
Water pollution
Water purification
Water quality
Water treatment
Water velocity
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Both river bank filtration and dead-end sand filtration are becoming increasingly applied in rural areas to improve the quality of fecally contaminated water. To evaluate the capacity of both treatments to remove E. coli, fecal streptococci, and somatic and K13-phages, this study investigates their concentrations in diluted wastewater after short-distance tangential sand filtration and dead-end sand filtration. Bacteria were almost undetectable in both systems after 60 cm depth, and at a pore-water velocity of 1 m/d. Both phages underwent removal of 2.5 logs by tangential filtration, whereas dead-end filtration removed 5.1 logs and 3.9 logs of K13-phages and somatic phages, respectively. After discounting removal by the schmutzdecke, observed only in the dead-end filtration, both systems removed phages similarly. It is concluded that short-distance river bank filtration, alone, does not meet WHO requirements for drinking water. However, the concomitant reduction of suspended solids renders the filtered water amenable to further treatment steps.
ISSN:1061-4303
1554-7531
DOI:10.2175/106143017X15131012152933