| 宋新山,严登华,丁怡,王宇晖.进出水口位置对潜流人工湿地水力效率及死区分布的影响[J].水利学报,2014,45(4): |
| 进出水口位置对潜流人工湿地水力效率及死区分布的影响 |
| Impacts of inlet-outlet configuration on hydraulic efficiency and dead zone in horizontal subsurface constructed wetland |
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| DOI： |
| 中文关键词: 人工湿地 水力效率 进出水口位置 死区分布 示踪实验 |
| 英文关键词: Constructed wetlands Hydraulic efficiency Inleit-outlet configuration Dead zone distribution Tracer experiments |
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| 摘要点击次数: 2606 |
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| 中文摘要: |
| 将模拟人工湿地装置分别设置3个进水口（上、中、下）和3个出水口（上、中、下），通过氯化钠NaCl脉冲示踪实验研究了这9种不同进出水口配置的停留时间分布曲线，分别计算出它们的水力效率，并进行了评价。同时通过同一透明装置的染料示踪实验，获得其染料运移图像，并根据图像处理获得模拟人工湿地装置中水流运移轨迹和死区分布情况，从而对上述水力效率评价结果进行了直观验证。结果表明：下进上出的水力效率最高，下进下出的水力效率最低。进一步的图像分析表明，下进上出的死区最小，下进下出的死区最大。分析表明：人工湿地的进出水口位置对其水力停留时间、死区等会产生关键影响，从而导致其水力效率的变化，进而可能通过影响水流中污染物和填料基质的接触过程而导致水中污染物去除效率的变化。 |
| 英文摘要: |
| An artificial constructed wetland simalator was designed with three inlets and outlets which are respectively set at the top， middle and bottom on both sides. Nine inlet and outlet combinations were studied. Retention time distribution curve were obtained using NaCl tracer test， which were used for hydraulic efficiency calculation and assessment for different inlet-outlet configurations. Moreover， dye tracer experiments were conducted to verify the hydraulic efficiency. Using a non-opaque reactor， sequential dye flow transition images were obtained. Image processing was made to analyze the flow trace propagation and dead zones distribution. The results indicate that bottom inlet-top outlet has the highest hydraulic efficiency comparing with the lowest hydraulic efficiency for bottom inlet-bottom outlet configuration. Dye visualization shows the least area of dead zones for bottom inlet-top outlet configuration and the largest area of dead zones for bottom inlet-bottom outlet. There are significant impacts of the inlet-outlet configurations on hydraulic retention time and dead zones distribution causing hydraulic efficiency changes. This may affect the contacts between pollutants and filter leading to the change of removal rate. |
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