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| Effects of irrigation using antecedent reclaimed water and livestock wastewater on the cadmium adsorption capacity of soils |
| Received:December 29, 2020 |
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| KeyWord:antecedent irrigation;reclaimed water;livestock wastewater;soil;cadmium;adsorption |
| Author Name | Affiliation | E-mail | | LI Bao-gui | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LIU Yuan | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Key Laboratory of High Efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | | | TAO Zhen | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHAO Zhi-juan | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Key Laboratory of High Efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | | | FAN Tao | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Key Laboratory of High Efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | | | LI Zhong-yang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Key Laboratory of High Efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | lizhongyang1980@163.com |
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| Abstract: |
| In order to reveal the effects on Cadmium（Cd）adsorption by soils antecedently irrigated with unconventional water sources and the influencing factors, fluvo-aquic and red soils were used, and deionized-water irrigation was set as the control（CK）. Cd adsorption kinetics, isothermal adsorption, and Cd form desorption experiments were conducted. Compared with CK, reclaimed water irrigation significantly reduced Cd adsorption by these two soils; livestock wastewater irrigation significantly reduced Cd adsorption of both soils at lower Cd concentrations（5 mg·L-1 and 10 mg·L-1）but increased Cd adsorption at higher Cd concentrations（25 mg·L-1 and 50 mg·L-1）. The Freundlich model fitted Cd adsorption of all soils well, and the fitting results indicated that the Cd adsorption capacity of soils irrigated with livestock wastewater was stronger, whereas the opposite was true for reclaimed water. Cd adsorbed by these two soils mainly existed in the complexed form. Livestock wastewater and reclaimed water irrigation could affect soil pH, clay, salt and Cu contents. Consequently, the complexed and exchangeable form, as well as the total Cd adsorbed by these two soils, were altered. In conclusion, the Cd adsorption capacity of soils is reduced after reclaimed water irrigation, while the scenarios vary depending on initial Cd concentration after livestock wastewater irrigation. |
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