This work explains and compares some experiences in reclamation for irrigation reuse of large flowrate of domestic wastewater. It has been focused flow velocity and water depth in storage basin as related parameters basic in limiting and balancing different biological phenomena active in wastewater remediation. O.S., nitrogenous and phosphorus removal has been studied comparing the results of three experimental research campaigns which have monitored two facultative lagoon, receiving treated wastewaters, as natural finishing system able for remediation besides for storage. The first, carried out in the Simbirizzi basin, receives the whole final outfall of Cagliari WWTP (600.000 AE). It makes an yearly volume balance for agricultural recycling and reuse and permits to avoid every discharge in seawater during summer, so it presents almost static hydraulic conditions. The second test is carried out into an internal tract of the Cesenatico harbour basin in a pulmonary area characterized by high average flow, with vertical profiles of velocity and turbulent mixing varying in function of tidal type and phase. This research is carried out by an YSI multiparameter probe into an internal channel at the limits of the transition area, at five kilometres from sea outlet. Along his length (almost 2000 m) this tract receives, in dry water conditions, only residual organic loading from Cesena WWTP(180.000 AE). Data permit to recognize active phenomena in aquatic ecosystem and reveal as largely prevalent, along water column, photosynthetic and aerobic oxidizing activities. As it’s visible in the reported graph, profiles reveal also as not negligible an under placed active layer varying between 10 to 20 cm where anoxic denitrification activities conditions are maintained by oxygen consumption of bottom activities. Experimental results are modelled and organized in order to discuss variations in remediation efficiency carried out in static storage basins subject to vertical stratification rather than in weakly mixed basins provided with artificial turbulent flow.
Mancini M.L. (2012). Reuse of wastewaters stored in facultative ponds: flow conditions and refinement by algal and bacterial biomass. ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL, 11, S129/1-S129/6.
Reuse of wastewaters stored in facultative ponds: flow conditions and refinement by algal and bacterial biomass
MANCINI, MAURIZIO
2012
Abstract
This work explains and compares some experiences in reclamation for irrigation reuse of large flowrate of domestic wastewater. It has been focused flow velocity and water depth in storage basin as related parameters basic in limiting and balancing different biological phenomena active in wastewater remediation. O.S., nitrogenous and phosphorus removal has been studied comparing the results of three experimental research campaigns which have monitored two facultative lagoon, receiving treated wastewaters, as natural finishing system able for remediation besides for storage. The first, carried out in the Simbirizzi basin, receives the whole final outfall of Cagliari WWTP (600.000 AE). It makes an yearly volume balance for agricultural recycling and reuse and permits to avoid every discharge in seawater during summer, so it presents almost static hydraulic conditions. The second test is carried out into an internal tract of the Cesenatico harbour basin in a pulmonary area characterized by high average flow, with vertical profiles of velocity and turbulent mixing varying in function of tidal type and phase. This research is carried out by an YSI multiparameter probe into an internal channel at the limits of the transition area, at five kilometres from sea outlet. Along his length (almost 2000 m) this tract receives, in dry water conditions, only residual organic loading from Cesena WWTP(180.000 AE). Data permit to recognize active phenomena in aquatic ecosystem and reveal as largely prevalent, along water column, photosynthetic and aerobic oxidizing activities. As it’s visible in the reported graph, profiles reveal also as not negligible an under placed active layer varying between 10 to 20 cm where anoxic denitrification activities conditions are maintained by oxygen consumption of bottom activities. Experimental results are modelled and organized in order to discuss variations in remediation efficiency carried out in static storage basins subject to vertical stratification rather than in weakly mixed basins provided with artificial turbulent flow.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
