Annual variation patterns of the effluent water quality from a green roof and the overall impacts of its structure

Environmental Science and Pollution Research International
Hongxiang ChaiQiang He

Abstract

To explore the optimal combination of vegetation type, substrate type, and substrate thickness in a green roof and the interannual variation patterns of the runoff quality, eight green roof units were constructed in Shenzhen, China. Runoff quality of the eight units was monitored for 3 years (24 rainfall events). The rainfall event mean concentrations (EMC) were used to evaluate runoff quality as well as annual pollutant load. An orthogonal L8(24) experiment was designed to verify the significance of different factors. An optimal level of significant factors was selected to determine the optimal design of green roof. The optimal vegetation was Ophiopogon japonicus. The optimal substrate was modified perlite, while optimal substrate thickness was 200 mm. A three-year interannual variation analysis was performed on the optimal green roof. It was found that the interannual variation of each runoff quality index is different. The concentrations of SS, COD, and NH4+-N in the runoff decreased with years. The concentration of NO3--N increased over time, while TP remained stable. The concentration of TN had certain volatility with no significant interannual variation. Overall, the runoff quality of the green roof improves over time. Th...Continue Reading

References

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Citations

Jun 28, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Carolyn M RodakJason R Vogel
Aug 14, 2019·Environmental Science and Pollution Research International·Ruifen LiuShaw L Yu
May 22, 2020·The Science of the Total Environment·Yongwei GongLinmei Nie
Jan 18, 2022·Environmental Science and Pollution Research International·Chen XuJian Zhan

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