Effects of anionic surfactant in reclaimed water on soil structural properties and water flow characteristics
SHENG Feng1,2,3, LI Zhong-run1,2, FANG Xian-jing1,2, WEN Ding1,2, HU Guo-hua1,3, SHEN Hong-wei1,3
1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China; 3. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China
Abstract：Irrigation experiments with three different irrigation conditions, i.e. different concentration of anionic surfactant in irrigation water (i.e. 0critical micelle concentration (CMC), 0.001CMC, 0.01CMC and 0.1CMC), irrigation frequencies (irrigated every day, once every two days, and once every three days), and reclaimed water and freshwater alternative irrigation schedules (irrigated with reclaimed water only, and irrigated with reclaimed water and freshwater alternatively) were conducted in laboratory with man-filled soil columns to study the effects of surfactant in reclaimed water on soil bulk density, porosity structure, aggregate stability, soil water repellency, surface infiltrability and preferential flow heterogeneity. Higher concentration of anionic surfactant in reclaimed water and higher irrigation frequency with lower irrigation quota both lead to smaller soil bulk density, greater non-capillary porosity ratio and normalized mean weight diameter of soil aggregate, higher soil water repellency, worse surface infiltrability, and stronger preferential flow behavior, which increased the difficulty of farmland management; higher frequency of freshwater flush in reclaimed water and freshwater alternative irrigation increased soil bulk density, decreased non-capillary porosity ratio and normalized mean weight diameter of soil aggregate, reduced soil water repellency, enhancing surface infiltrability, and decreased preferential flow heterogeneity, which decreased the time for farmland irrigation and increased irrigation efficiency.
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SHENG Feng, LI Zhong-run, FANG Xian-jing, WEN Ding, HU Guo-hua, SHEN Hong-wei. Effects of anionic surfactant in reclaimed water on soil structural properties and water flow characteristics. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4531-4539.
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