| This article has been：Browse 1873Times Download 2280Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2017.0677 |
|
| Effects of the Amount of Irrigation with Reclaimed Wastewater on Soil Properties and Distribution of Pathogenic Bacteria |
|
HAN Yang, QI Xuebin, LI Ping, CHANG Di, LI Zhongyang, CUI Bingjian, YAN Xushan
|
|
1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2. Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
|
| Abstract: |
| 【Objective】 Reusing reclaimed wastewater for irrigation can relieve demand for freshwater and reduce its discharge into watercourse, but it could risk pathogenic spreading. The purpose of this paper is to investigate the impact of the amounts of irrigation with treated municipal wastewater on physical and chemical properties of soil, as well as the distribution of fecal coliforms. 【Method】 The experiments were conducted in soil columns irrigated with reclaimed wastewater taken from a local wastewater treatment plant. In the experiments, we measured change in the physical and chemical of the soil, as well as the distribution of fecal coliform bacteria under different irrigation rates and water qualities. The control was irrigation with tap water. 【Result】 Compared to the CK, irrigating with the treated wastewater increased soil organic matter (OM), total nitrogen (TN), total phosphorus (TP) and electrical conductance (EC), whereas reduced soil pH slightly. The OM, TN and TP in the topsoil (0~20 cm) were higher under sufficient irrigation than under insufficient irrigation, as opposed to EC. It was found that irrigation with the reclaimed wastewater significantly increased the number of fecal coliform bacteria in the soil, especially in the topsoil (0~20 cm). The number of fecal coliform bacteria was positively correlated with the contents of OM, TN, TP and EC, and negatively correlated with soil pH and soil water content. 【Conclusion】 Irrigation with reclaimed wastewater can improve soil fertility; appropriately controlling the irrigation amount can effectively reduce pollution of pathogenic bacteria. Increase in soil nutrients favors growth and spreading of fecal coliform bacteria in soil. |
| Key words: Reclaimed wastewater; irrigation level; physical and chemical properties; fecal coliform bacteria |
|
|
