再生水灌溉过程中土壤盐分及重金属运移研究

Migration of Soil Salinize-alkalization and Heavy Metals in the Process of Reclaimed Water Irrigation

采用污水处理厂再生水,以自来水为对照,通过土柱模拟试验,研究了2种灌溉方式下土壤盐分及重金属的积累分布规律,同时分析了土壤淋滤液中重金属的质量浓度。结果表明,除0～20cm土层全盐量增加外,20～60cm土层盐分积累与自来水灌溉无明显差异;重金属在土壤中累积不明显,与自来水灌溉相比,重金属质量分数无显著差异;土壤淋滤液中重金属质量浓度有所降低,均符合《地下水环境质量标准》(GB/T 14848—93)二类水标准。

In this paper,tap water was contrasted with the reclaimed water from the second wastewater treatment plant of Gaomi.The soil column simulated experiments were adopted to study the accumulation-migration of soil salinize-alkalization and heavy metals in two different irrigation patterns,and analysis the quantity of heavy metals in the filtrate.The results showed that the total dissolved solid of 0 to 20 cm soil layer increased.Compared with tap water irrigation,no significant difference can be detected for the content of the total dissolved solid in 20 to 60 cm soil layer.The distribution on pattern of heavy metals in soil system indicated no accumulation evidence of heavy metals was found,meanwhile,no significant difference can be detected for the contents of heavy metals with tap water irrigation pattern.The quantity of heavy metals in the filtrate reduced,and all of the heavy metals met the second standard of Groundwater Environmental Quality Standards（GB/T 14848—93）.