Biological solution to storm water?

Standard practice in Flanders is to limit the hydraulic capacity of sewage treatment works to 6Q14 (Q14= 1.7 dry weather flow Q(DWF)). A maximum of 3Q14 is treated biologically, while the excess flow undergoes only physical treatment in storm tanks. This practice has been challenged by a new high-fl...

Full description

Saved in:
Bibliographic Details
Published in:Water science and technology 2004-01, Vol.50 (7), p.171-177
Main Authors: Bixio, D, Thoeye, C, De Gueldre, G
Format: Article
Language:English
Subjects:
Activated sludge
Ammonia
Ammonia - chemistry
Biodegradation, Environmental
Biological effects
Biological treatment
Clarifiers
Discharge
Nitrification
Nitrogen - chemistry
Phosphorus
Rain
Sewage
Sewage treatment
Storage tanks
Storm sewers
Storm wastewater
Stormwater
Suspended solids
Tanks
Time Factors
Waste Disposal, Fluid - methods
Waste treatment
Wastewater treatment
Wastewater treatment plants
Water
Water Movements
Water Pollutants
Water Pollution
Water Purification - methods
Weather
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Standard practice in Flanders is to limit the hydraulic capacity of sewage treatment works to 6Q14 (Q14= 1.7 dry weather flow Q(DWF)). A maximum of 3Q14 is treated biologically, while the excess flow undergoes only physical treatment in storm tanks. This practice has been challenged by a new high-flow activated sludge operation concept, consisting of the treatment of the full storm sewage flow in the biological train and of the use of the storm tanks as additional secondary clarifiers. After successful testing in two installations, 56 works of different sizes and types were switched to high-flow activated sludge operation from 1999 to 2002. This paper reports on progress and experiences gained since then. The analysis focuses on the parameters subject to regulatory discharge (BOD, COD, suspended solids, total nitrogen and total phosphorus) plus ammonia. Special attention is paid to the performance of the clarification and of the nitrification processes. The results indicate that high-flow biological treatment provides a substantial reduction in wet weather discharges while maintaining acceptable process operating conditions.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0448