WUYan-guo,CHENGRui-rui,YANGMo,et al.Performance of Green Roof Enhanced by Super Absorbent Polymer[J].China Water & Wastewater,2022,38(19):102-107.
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Performance of Green Roof Enhanced by Super Absorbent Polymer

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第19期 Page: 102-107 Column: Date of publication: 2022-10-01
Author(s):
WU　Yan-guo1;  CHENG　Rui-rui2;  YANG　Mo3;  WANG　Hong-jie3; 4; 5;  ZHENG　Yu-xiao6;  DONG　Wen-yi3; 4; 5;  ZHANG　Kai7
（1. Guangdong Architectural Design and Research Institute Co. Ltd.， Guangzhou 510010， China；2. Shenzhen Branch， CSCEC AECOM Consultants Co. Ltd.， Shenzhen 518028， China； 3. School of Civil and Environmental Engineering， Harbin Institute of Technology ， Shenzhen 518055， China； 4. Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control， Shenzhen 518055， China； 5. State Key Laboratory of Urban Water Resource and Environment， School of Environment， Harbin Institute of Technology， Harbin 150090， China； 6. Longgang District Water Supplies Bureau， Shenzhen 518172， China； 7. Bao’an District Water Supplies Bureau，Shenzhen 518100， China）
Keywords:
super absorbent polymer;  green roof;  water retention capacity;  runoff control;  sponge city
Abstract:
Green roof is an important sponge city measure, which can regulate rainwater runoff and alleviate urban heat island effect. Due to the limited load-bearing capacity of the roof, the thickness of the matrix of traditional green roof is thin, and the water retention capacity is limited. In addition, roof plants are prone to dry up or even die due to lack of water, which greatly affects the sponge performance and increases the operational cost of the green roof. Based on this, a polymer which had a good water absorption performance was selected. Its water absorption capacity was 224 g/g, and it had strong reusability and resistance in harsh environment (temperature, salinity and pH). The experimental results in Longgang District of Shenzhen showed that the sponge efficiency of green roof was significantly improved when the polymer was mixed with the matrix of green roof. Due to the presence of super absorbent polymer, the formation rate of green roof was improved, and the growth of plants was significantly better than that of the blank group without polymer. The super absorbent polymer significantly reduced the green roof runoff by up to 15.9% in four rainfall events. Considering the advantages of easy availability and low price, the super absorbent polymer has good water retention performance, and significantly improves the sponge efficiency of green roof, indicating that it is a green roof matrix ameliorant with broad application potential.
Last Update: 2022-10-01