不同出流方式下垂直流人工湿地数值模拟  

Modeling Treatment Efficiency of Two-stage Subsurface Vertical Flow Constructed Wetlands with Different Ways of Effluent

作　　者：范思雨 龙天渝[1,2] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学低碳绿色建筑国际联合研究中心,重庆400045

出　　处：《重庆工商大学学报（自然科学版）》2017年第6期103-110,共8页Journal of Chongqing Technology and Business University:Natural Science Edition

基　　金："十二五"国家科技支撑计划重点项目(2011BAD31B03)

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。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.

关 键 词：人工湿地 出流方式 CW2D 数值模拟 

分 类 号：X703[环境科学与工程—环境工程]