| 伍振华,李良香,李素丽,程夕冉,王学礼,李正文,李志刚.铬在水平潜流和垂直流人工湿地中的形态转化和迁移[J].农业环境科学学报,2023,42(8):1803-1815. |
| 铬在水平潜流和垂直流人工湿地中的形态转化和迁移 |
| Morphological transformation and migration of chromium in horizontal subsurface flow and vertical flow constructed wetlands |
| 投稿时间：2022-12-06 修订日期：2023-03-09 |
| DOI：10.11654/jaes.2022-1248 |
| 中文关键词: 人工湿地 薏苡 铬 铬形态 土壤酶 可溶性有机物 |
| 英文关键词: constructed wetlands Coix lacryma-jobi L. chromium chromium chemical speciation soil enzymes dissolved organic matter |
| 基金项目:国家自然科学基金项目（21167002，41867023）；广西自然科学基金项目（2018GXNSFAA281214） |
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| 中文摘要: |
| 本研究以薏苡为湿地植物，构建了小型垂直流人工湿地（VC）和水平潜流人工湿地（HC），研究了不同水分管理对处理Cr6+废水时铬的迁移转化的影响。结果表明： Cr6+处理下，两种湿地的薏苡生长均受到了抑制，水平潜流人工湿地薏苡生长受抑制程度低于垂直流人工湿地。水平潜流人工湿地铬含量较高，而垂直流人工湿地易吸收的可交换态和碳酸盐提取态铬含量较高。基质的pH和Eh均随Cr6+浓度的增加而呈现减小趋势。垂直流人工湿地pH及Eh值均大于水平潜流人工湿地。与潜流人工湿地相关的酶活性相比，垂直流人工湿地可以增加基质中蔗糖酶活性，但Cr6+处理下脲酶活性却低于水平潜流人工湿地。高通量分析表明，不同处理下的两种人工湿地基质微生物群落存在显著差异，水平潜流人工湿地微生物更有利于将铬转化为难以利用的铬形态。水平潜流人工湿地对废水中的Cr6+有更好的去除能力。研究表明，水平潜流人工湿地有利于促进Cr6+转化为难以利用的铬形态，提高了人工湿地对污水中Cr6+的去除能力。 |
| 英文摘要: |
| In this study, a small vertical flow-constructed wetland(VC) and a horizontal subsurface flow-constructed wetland(HC)were constructed with Coix lacryma-jobi L. as a wetland plant. The effects of different water management techniques on the migration and transformation of chromium in Cr6+ wastewater were investigated. The results revealed that:Under Cr6+ treatment, the growth of Coix lacryma-jobi L. in the two wetlands was inhibited, and the growth of Coix lacryma-jobi L. in horizontal subsurface flow-constructed wetland was less inhibited than that in vertical flow-constructed wetland. The content of chromium in the horizontal subsurface flowconstructed wetland was higher, whereas the content of exchangeable and carbonate-extractable chromium in the vertical flow-constructed wetland was higher. The pH value and Eh of the substrate decreased as Cr6+ concentration increased. The pH and Eh values of vertical flowconstructed wetlands were higher than those of horizontal subsurface flow-constructed wetlands. Compared with the enzyme activities related to the subsurface flow-constructed wetland, vertical flow-constructed wetland could increase the sucrase activity in the substrate; however, the urease activity under Cr6+ treatment was lower than that in the horizontal subsurface flow-constructed wetland. Highthroughput analysis demonstrated significant differences in microbial communities between the two constructed wetlands under different treatments. Horizontal subsurface flow-constructed wetland microorganisms were more conducive to converting chromium into difficult-touse chromium forms. Horizontal subsurface flow-constructed wetland is more effective at removing Cr6+ from wastewater. The results demonstrated that the horizontal subsurface flow-constructed wetland was beneficial in promoting Cr6+ transformation into chromium form, which was challenging to use, and improved the removal ability of Cr6+ in wastewater. |
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