This paper shows the results of a monitoring campaign of the oxygen transfer efficiency and of the greenhouse gas emissions, in a large urban wastewater treatment plant (600000 P.E.) located in Tuscany (Italy). Different measurements techniques were compared for GHGs emission monitoring. Off-gas tests were successfully carried out showing high-performance of the aeration system. The ammonia-DO cascade controller recently installed guaranteed an oxygen transfer efficiency higher than the one registered in a previous off-gas test campaign carried out when the air-flow rate control was based only on the DO concentration. Wastewater treatment processes actually produce GHGs (nitrous oxide, methane and carbon dioxide), which can be successfully monitored using the off-gas test device. The different sampling techniques gave similar results, but the daily variability of the N2O production requires continuous sampling of the off-gas. The present results are in accordance with literature data both in terms of emission concentrations and of the ratio between the N2O emissions and the inlet total nitrogen load.

Monitoring of the oxygen transfer efficiency and greenhouse gas emissions in the oxidation tank of San Colombano WWTP / Cecilia Caretti; Riccardo Gori; Simone Caffaz; Claudio Lubello. - ELETTRONICO. - (2014), pp. 310-314. (Intervento presentato al convegno IWA specialized conference EcoTechnologies for Wastewater Treatment "ecoSTP2014" tenutosi a Verona nel 23-27 Giugno 2014).

Monitoring of the oxygen transfer efficiency and greenhouse gas emissions in the oxidation tank of San Colombano WWTP

CARETTI, CECILIA;GORI, RICCARDO;LUBELLO, CLAUDIO
2014

Abstract

This paper shows the results of a monitoring campaign of the oxygen transfer efficiency and of the greenhouse gas emissions, in a large urban wastewater treatment plant (600000 P.E.) located in Tuscany (Italy). Different measurements techniques were compared for GHGs emission monitoring. Off-gas tests were successfully carried out showing high-performance of the aeration system. The ammonia-DO cascade controller recently installed guaranteed an oxygen transfer efficiency higher than the one registered in a previous off-gas test campaign carried out when the air-flow rate control was based only on the DO concentration. Wastewater treatment processes actually produce GHGs (nitrous oxide, methane and carbon dioxide), which can be successfully monitored using the off-gas test device. The different sampling techniques gave similar results, but the daily variability of the N2O production requires continuous sampling of the off-gas. The present results are in accordance with literature data both in terms of emission concentrations and of the ratio between the N2O emissions and the inlet total nitrogen load.
2014
IWA ecoSTP2014 – Conference Proceedings
IWA specialized conference EcoTechnologies for Wastewater Treatment "ecoSTP2014"
Verona
23-27 Giugno 2014
Cecilia Caretti; Riccardo Gori; Simone Caffaz; Claudio Lubello
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/935334
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