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Impact of green roof plant species on domestic wastewater treatment

Water quality indicated by chemical oxygen demand, total nitrogen, ammonium nitrogen, and total phosphorus from the effluent complied with the widely accepted limits on domestic wastewater discharge. Our results demonstrate that green roofs can be designed for the ecological treatment of domestic wastewater on the household scale. | Environmental Advances 4 2021 100059 Contents lists available at ScienceDirect Environmental Advances journal homepage www.elsevier.com locate envadv Impact of green roof plant species on domestic wastewater treatment Lijiao Liu Junjun Cao Mehran Ali Jiaxin Zhang Zhaolong Wang School of Agriculture and Biology Shanghai Jiaotong University Shanghai 200240 P. R. China a r t i c l e i n f o a b s t r a c t Keywords Green roof is one of the nature-based solutions to provide environmental and social benefits for sustainable urban Green roof development. Green roofs irrigated with domestic wastewater solves not only their irrigation water resource but Domestic wastewater treatment also the urban wastewater treatment. However it is unknown whether the capacity of green roofs in pollutant C4 plants removal meets the requirement of domestic wastewater treatment. This study was to investigate the capacity of C3 plants pollutant removal by the green roofs with C4 C3 and CAM plant species when irrigated with domestic wastewa- CAM plants Irrigation ter. Results showed that green roofs removed 79.27 97.38 of total suspended solids 79.94 98.92 of chemi- Water use strategies cal oxygen demand 65.26 90.52 of total nitrogen 83.32 96.31 of ammonium nitrogen 77.83 93.97 of nitrate nitrogen and 93.77 98.94 of total phosphorus respectively. C4 and C3 plants contributed significantly higher runoff reduction removal of total nitrogen chemical oxygen demand total nitrogen ammonium nitrogen nitrate nitrogen phosphates and total phosphorus than CAM plants. Water quality indicated by chemical oxygen demand total nitrogen ammonium nitrogen and total phosphorus from the effluent complied with the widely accepted limits on domestic wastewater discharge. Our results demonstrate that green roofs can be designed for the ecological treatment of domestic wastewater on the household scale. 1. Introduction 2019 which lead to the contradiction between water consumption for green roof plants and water .