Roofs represent common unused space in the urban areas that can be used to enhance environmental sustainability of the cities. One option is the use of a novel system called constructed wetroof (CWR), a combination of a constructed wetland and green roof that integrates on-site wastewater treatment and urban greening. This paper studies, from July 2012 to July 2013, a novel 9-cm deep system (total area 306 m2, 90.2 m2 PE-1) installed on the roof of an office-building treating its wastewater and providing reuse water for toilets flushing. The aim was to further understand the nutrient flow and the hydrology of the system in order to comprehend its capability for the wastewater treatment. The CWR showed a high performance for wastewater treatment (reductions of: 85% for COD, 86% for TSS, 97% for TN and 68% for TP). The major processes for TN and TP removal were the denitrification and bed substratum adsorption, respectively. The hydrology experiments showed that the major water inflow to the CWR was rain water (58%), showing its high dependence on the atmospheric conditions. Effluent volume was only 28% of the influent suggesting a high potential of the CWR for water retention.
Nutrient flow and hydrology of a 9-cm-deep constructed wetroof
Stevo LavrnićPrimo
;
2014
Abstract
Roofs represent common unused space in the urban areas that can be used to enhance environmental sustainability of the cities. One option is the use of a novel system called constructed wetroof (CWR), a combination of a constructed wetland and green roof that integrates on-site wastewater treatment and urban greening. This paper studies, from July 2012 to July 2013, a novel 9-cm deep system (total area 306 m2, 90.2 m2 PE-1) installed on the roof of an office-building treating its wastewater and providing reuse water for toilets flushing. The aim was to further understand the nutrient flow and the hydrology of the system in order to comprehend its capability for the wastewater treatment. The CWR showed a high performance for wastewater treatment (reductions of: 85% for COD, 86% for TSS, 97% for TN and 68% for TP). The major processes for TN and TP removal were the denitrification and bed substratum adsorption, respectively. The hydrology experiments showed that the major water inflow to the CWR was rain water (58%), showing its high dependence on the atmospheric conditions. Effluent volume was only 28% of the influent suggesting a high potential of the CWR for water retention.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
