Jl. Bertrandkrajewski et al., FLOW AND POLLUTANT MEASUREMENTS IN A COMBINED SEWER SYSTEM TO OPERATEA WASTE-WATER TREATMENT-PLANT AND ITS STORAGE TANK DURING STORM EVENTS, Water science and technology, 31(7), 1995, pp. 1-12
Citations number
7
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Urban storm drainage is considered using an integrated approach taking
into account all parts of the sewer system: pipes, storage tanks, ove
rflows, treatment plant and receiving waters. This paper presents an e
xperimental research in Boran-sur-Oise (France) where continuous measu
rements are carried out in the combined sewer system (catchment area 6
1 ha), in the storage tank (245 m(3)) and in the treatment plant (3000
p.e.). One of the objectives is a comprehensive knowledge of effects
of storm events on treatment plant process and efficiency. Catchment s
ewer system, storage rank, treatment plant and measurements are descri
bed. Results for an autumn rainfall are given as an example. Many impa
cts on the treatment plant are observed. Despite the lend increase com
pared with dry weather periods, especially for TSS and ammonia, the pl
ant efficiency remains satisfactory. Short-term and long-term impacts
are distinguished. New rules for storage tank operation are proposed t
o avoid hydraulic plant overloading and to use the stormwater solids-s
ettling properties. These rules will be tested in the future to verify
their compatibility with receiving water quality requirements. Measur
ements in upstream sewer system could also be used in the future to op
erate stormwater treatment systems during storm events.