Zhou Yi-qi, Liu Yun-xia, Fu Hui-min
Huan Jing Ke Xue. 2016 Jan 15;37(1):288-92.
With acceleration of urbanization, water shortages will become a serious problem. Usage of reclaimed water for flushing and watering of the green areas will be common in the future. To study the heavy metal contamination of soils after green area irrigation using recycled wastewater from special industries, we selected sewage and laboratory wastewater as water source for integrated oxidation ditch treatment, and the effluent was used as irrigation water of the green area. The irrigation units included broad-leaved forest, bush and lawn. Six samples sites were selected, and 0-20 cm soil of them were collected. Analysis of the heavy metals including Cr, Mn, Ni, Cu, Zn, As, Cd and Pb in the soil showed no significant differences with heavy metals concentration in soil irrigated with tap water. The heavy metals in the soil irrigated with recycled water were mainly enriched in the surface layer, among which the contents of Cr, Ni, Cu, Zn and Pb were below the soil background values of Beijing. A slight pollution of As and Cd was found in the soil irrigated by recycled water, which needs to be noticed.
随着城市化进程的加速，水资源短缺将成为一个严重的问题。未来，再生水用于绿地冲洗和浇灌将变得很普遍。为了研究利用特殊行业的再生废水灌溉绿地后土壤的重金属污染情况，我们选择了污水和实验室废水作为综合氧化沟处理的水源，处理后的出水用作绿地的灌溉用水。灌溉单元包括阔叶林、灌木丛和草坪。选取了六个采样点，并采集了其0 - 20厘米深度的土壤。对土壤中铬（Cr）、锰（Mn）、镍（Ni）、铜（Cu）、锌（Zn）、砷（As）、镉（Cd）和铅（Pb）等重金属的分析表明，其浓度与用自来水灌溉的土壤中的重金属浓度无显著差异。再生水灌溉土壤中的重金属主要富集在表层，其中铬、镍、铜、锌和铅的含量低于北京土壤背景值。在用再生水灌溉的土壤中发现了轻微的砷和镉污染，需要引起注意。
