【摘要】 为了改善蓟运河的水质,使其达到《地表水环境质量标准》(GB 3838—2002)中的Ⅳ类水质标准,在蓟运河北岸的空地上构建了水平潜流人工湿地和垂直流人工湿地,研究了其对河水的净化效果。为防止浮游藻类堵塞填料床,原水在进入人工湿地前先经加药气浮工艺预处理,当PAC的投加量为50 mg/L时,水平潜流人工湿地对COD、BOD5、SS、TN、NH3-N、TP的去除率分别为65%、50%、100%、70%、90%和65%,垂直流人工湿地对COD、BOD5、SS、TN、NH3-N、TP的去除率分别为45%、70%、100%、65%、95%、85%。两种人工湿地的出水水质均可以达到Ⅳ类标准,但考虑到冬季低温时,垂直流人工湿地的填料床极易发生冰冻的现象,所以建议采用水平潜流人工湿地处理蓟运河水。更多还原

【Abstract】 To improve the water quality of Jiyun River to class Ⅳ criteria specified in Environmen-tal Quality Standards for Surface Water(GB 3838-2002),horizontal subsurface-flow and vertical-flow constructed wetlands were built on empty area in the north bank of Jiyun River to investigate the purifica-tion effect.The raw water from Jiyun River was pretreated by air flotation before entering the system to prevent phytoplankton clogging the packed bed.When PAC dosage is 50 mg/L,the removal rates of COD,BOD5,SS,TN,NH3-N and TP in the horizontal subsurface-flow constructed wetland are 65%,50%,100%,70%,90% and 65% respectively,and those in the vertical-flow constructed wetland are 45%,70%,100%,65%,95% and 85% respectively.The effluent quality of both constructed wet-lands can reach the class Ⅳ criteria.However,considering that the packed bed of vertical-flow construc-ted wetland freezes during winter,the horizontal subsurface-flow constructed wetland is suggested to treat Jiyun River water.更多还原