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Sant Cugat del Vallès, Spain

This paper describes the work conducted to study the upgrade and expansion of the Terrassa WWTP biological treatment process. The new process consisted of a Bardenpho system with 2 anoxic zones and 2 aerobic zones. An IFAS fixed media was implemented in the pre-aerobic zone in order to increase nitrification capacity and the addition of an external carbon source at the post-anoxic zone was considered. Study was developed in 3 stages: first a pilot plant study was conducted representing the new Terrassa WWTP configuration at 1:4000 scale. Then, the pilot plant biological treatment was modelled using Bio Win 3.1 and calibrated with the information obtained in a wastewater characterisation and fractioning analysis campaign. Finally, once the model was calibrated, it was used to study the Terrassa WWTP performance with its future configuration and its capacity to satisfy effluent quality requirements.

Gali A.,Cetaqua Centro Tecnologico del Agua | Bouchy L.,Cetaqua Centro Tecnologico del Agua | Trillo J.,Asesoria Tecnica y Control | Rouge P.,Aquagest Medio Ambiente | Fabregas C.,Mina Publica dAigiies de Terrassa
Tecnologia del Agua | Year: 2012

This paper aims to demonstrate that sonication of an activated sludge can produce biodegradable COD to assure the removal of Nt in a denitrification process. The sonication work has been performed in a pilot plant of Terrassa WWTP. The sonication succeeded to be a competitive technology to obtain a carbon source for denitrification. If 33% of the sludge withdrawn is sonicated it is possible to remove 6-8 mg/1 of N-NO3 - with an effective power of 4.6 kWh/m3 and 8-12 mg/1 of N-NO3 - with an effective power of 9.2 kWh/m3. From the economic point of view the sonication showed to be 56% cheaper than using methanol as a carbon source for denitrification.

Gali A.,Asesoria Tecnica y Control | Garcia I.,Asesoria Tecnica y Control | Trillo J.,Asesoria Tecnica y Control
Tecnologia del Agua | Year: 2011

In the present study the improvements carried on during the rebuilding of Terrassa WWTP secondary decanters has been studied. Without modifying decanter civil work, The present radial bridges were substituted with diameter bridges with energy dissipation inlet (EDI) devices and Stamford screen in the perimeter walls. In both studies (DSS/FSS and Stress tests) the rebuilt decanters showed better results than in the older ones. Now, don't exist problems of losing of flocculation capacity; was able to work during more than 8 hours with a tip surface overflow rate of 1.2 m 3/m 2h and a tip solid loading rate of 6.9 kg/m 2h, without conditioning effluent quality and nor the sludge blanket. And the SS effluent quality decreased an average of 30-60%.

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