Diurnal fluctuation of indicator microorganisms and intestinal viruses in combined sewer system

Combined sewer overflow (CSO) has been considered to be a source of pathogenic microorganisms for aquatic environment. For the effective control and treatment of CSOs, the microbial behavior in combined sewer system (CSS) needs to be investigated. In this study, whole-day extensive monitoring of ind...

Full description

Saved in:
Bibliographic Details
Published in:Water science and technology 2009-01, Vol.60 (11), p.2791-2801
Main Authors: Kim, W J, Managaki, S, Furumai, H, Nakajima, F
Format: Article
Language:English
Subjects:
Aquatic environment
Aquatic microorganisms
Bacteria
Circadian Rhythm
Coliforms
Coliphages - isolation & purification
Diurnal variations
Drainage area
E coli
Environmental monitoring
Environmental Monitoring - methods
Faecal coliforms
Fecal coliforms
Humans
Indicators
Intestine
Intestines - microbiology
Japan
Microorganisms
Noon
Overflow
Pathogens
Ratios
Residential areas
Sewage - virology
Sewer systems
Spacecraft
Stormwater
Urban drainage
Urban Population
Viruses
Viruses - isolation & purification
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Combined sewer overflow (CSO) has been considered to be a source of pathogenic microorganisms for aquatic environment. For the effective control and treatment of CSOs, the microbial behavior in combined sewer system (CSS) needs to be investigated. In this study, whole-day extensive monitoring of indicator microorganisms and intestinal viruses in dry weather flow (DWF) was conducted at a small residential urban drainage area with CSS. All indicator bacteria represented similar diurnal variations in the two different monitoring campaigns; their concentrations gradually decreased to the minimum at the dawn (around 5 a.m.), increased sharply to the maximum around 7 to 8 a.m., and remained rather constant from noon to midnight. On the other hand, neither coliphages nor intestinal viruses showed any concentration peaks in the morning. The maximum/minimum load ratios ranged from 18 to 42 for total coliforms, fecal coliforms and E. coli, whereas those ratios for coliphages, enteroviruses and noroviruses G2 showed greater values than those for indicator bacteria. These results indicate that the diurnal variation patterns of bacterial and viral concentrations in DWF should be considered, which affect the discharge characteristics of each microorganism and the loads of bacteria and viruses in CSOs significantly vary with the overflow time as well.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2009.732