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污染控制技术及原理

Efficiency of a subsurface flow constructed wetland in pretreating a micro-polluted drinking water source

基金项目：国家自然科学基金(No.40971303);中国科学院学科前沿领域项目(No.KZCX3-SW-NA3-40);哈尔滨师范大学青年学术骨干资助计划项目(No.KGB200821)

摘要：以济南玉清湖水库为例,采用水平潜流人工湿地系统对沉砂后的微污染黄河水进行了预处理试验,考察了湿地系统对污染物的去除效率及其变化趋势.同时,根据实验数据,构建了潜流人工湿地系统COD、TN、TP的一级动力学模拟方程.结果表明,水平潜流人工湿地系统对COD、TP、TN和NH₄⁺-N的平均去除率分别为49.89%、50.44%、53.41%和48.45%;人工湿地对污染物的处理是物理、化学和生物及其协同作用的过程.人工湿地沿程及不同高度污染物浓度变化试验结果表明,人工湿地系统对污染物的降解沿人工湿地水流方向逐渐降低,污染物主要在人工湿地床体前部被去除,潜流人工湿地床体上部对污染物的去除效果更好.

Abstract：Taking the Yuqing Lake Reservoir in Jinan as an example,a horizontal flow constructed wetland system was used to pretreat the micro-polluted raw water from the Yellow River after sedimentation. The pollutant removal efficiency in the wetland treatment system was studied. According to analysis of the experimental data,a first order kinetic simulation equation of chemical oxygen demand (COD),total nitrogen (TN) and total phosphorus (TP) were established in the subsurface flow constructed wetland. The results of the pretreatment experiment showed that the average removal efficiencies of COD,TP,TNand NH₄⁺-Nwere 49.89%,50.44%,53.41% and 48.45%,respectively in the horizontal flow constructed wetland system. Purifying pollutants by the subsurface flow wetland is a combined action of physical,chemical,and biological processes. According to the longitudinal variation of pollutant concentration in the constructed wetland and different heights,it can be clearly observed that the pollutant removal efficiencies in the constructed wetland system declined along the water flow direction,and most of the pollutants were removed in the front of the constructed wetland system. Furthermore,the top of the subsurface constructed wetland system had a better treatment effect.

Key words：subsurface flow constructed wetland micro-polluted drinking water source pre-treatment operation efficiency