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模拟再生水灌溉下污灌土壤中盐分离子交换运移的试验研究

Keywords: 再生水,污灌土壤,盐分,离子交换,Na

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Abstract:

为研究再生水灌溉下原污灌区土壤中主要盐分离子交换运移规律,采用有污水灌溉背景的两种质地土壤,根据再生水的基本性质及其盐分离子组分,配制4种浓度水平的入渗液,进行土柱模拟试验。结果表明,不同质地土壤在低Na+配制液淋洗下的穿透曲线都出现下凹现象,但Na+在壤土中富集的表现并不显著,而在粉质砂壤土中部分Na+吸附累积时间较长;模拟再生水入渗溶液中不同组分的盐分离子在不同程度上影响污灌土壤中发生的离子化学反应的进行,导致各处理下Na+穿透时间发生显著差异;长期再生水灌溉会对HCO-3含量较高且粉粒比重大的土壤的入渗等性能产生更为不利的影响。

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