| 摘要: |
| 建立了二级垂直流人工湿地的二维非恒定微生物动力学模型，针对淹没出流方式、不同的等间隔淹没出流方式和定水头出流方式，采用数值模拟的方法研究二级垂直流人工湿地处理重庆市径流雨水的效果;结果表明：在相同工况下，间隔较大的淹没出流方式能达到最大的有效体积比和水力效率，水流在三层填料中与各种类微生物接触更加充分、持久，出流方式促进了溶解氧的传质，复氧后溶解氧浓度回升更快、浓度峰值更大、高浓度维持时间更长，因此促进了由微生物主导的生物化学降解反应，二级垂直流湿地对COD、氮和磷的去除效果也优于其他出流方式。 |
| 关键词: 人工湿地 出流方式 CW2D 数值模拟 |
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| Modeling Treatment Efficiency of Two stage Subsurface Vertical Flow Constructed Wetlands with Different Ways of Effluent |
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FAN Si-yu1, LONG Tian-yu1,2
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| Abstract: |
| A two-dimension convection-dispersion-biodynamics model was given to simulate the treatment efficiency of two-stage subsurface vertical flow constructed wetlands for urban stormwater runoff of Chongqing. Focus on the following 4 types of boundary conditions: Atmospheric Boundary-Seepage Face, Atmospheric Boundary-incomplete Seepage Face 1 (uniformly spaced effluent), Atmospheric Boundary- incomplete Seepage Face 2 (A-S2’s space is 2 times larger than A-S1‘s), Atmospheric Boundary-Constant Head. The simulated results show that under the same working condition, the A-S2 boundary condition has an obviously better performance on the transportation of dissolved oxygen and the treatment efficiency of COD,nitrogen and phosphorus removal , since the specific effluent mode offers a better hydraulic characteristic of the constructed wetland. |
| Key words: constructed wetlands effluent mode CW2D numerical simulation |
