The aim of this study is to develop a new urban wastewater treatment plant scheme for the sustainable agricultural wastewater reuse. The reclamation is obtained modifying an activated sludge process. In the proposed system, the influent is split into several separate streams which are then sent to the various treatment units to perform a partial, selective and modular removal of agronomically useful substances. Numerical simulations have been carried out by implementing the ASM1 model (by IWA). The model has been verified by the IWA and COST BSM1. The developed model allows us to run simulations for two distinct periods: the non-irrigated and the irrigated periods. The simulation results show that the effluent concentrations of the various substances are highly variable depending on the plant configuration. The new simplified process will allow the removal of readily biodegradable substances harmful to the environment, while releasing the slowly biodegradable nutrients, which are useful for soil irrigation. The advantage is that, with the same system, setting up a plant configuration rather than another, we can define the quality level of the sewage outflows that may be more suitable for irrigation or for protection of receiving water.
Innovative schemes for controlled removal of nutrients for urban wastewater agricultural reuse
CANIANI, Donatella;MANCINI, Ignazio Marcello;MASI, Salvatore
2011-01-01
Abstract
The aim of this study is to develop a new urban wastewater treatment plant scheme for the sustainable agricultural wastewater reuse. The reclamation is obtained modifying an activated sludge process. In the proposed system, the influent is split into several separate streams which are then sent to the various treatment units to perform a partial, selective and modular removal of agronomically useful substances. Numerical simulations have been carried out by implementing the ASM1 model (by IWA). The model has been verified by the IWA and COST BSM1. The developed model allows us to run simulations for two distinct periods: the non-irrigated and the irrigated periods. The simulation results show that the effluent concentrations of the various substances are highly variable depending on the plant configuration. The new simplified process will allow the removal of readily biodegradable substances harmful to the environment, while releasing the slowly biodegradable nutrients, which are useful for soil irrigation. The advantage is that, with the same system, setting up a plant configuration rather than another, we can define the quality level of the sewage outflows that may be more suitable for irrigation or for protection of receiving water.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
