摘要
通过在污水中加入氯化钠示踪剂,研究人工湿地及其对照系统内水力停留时间的分布(HRTD),探讨潜流人工湿地和垂直流人工湿地中植物在堵塞前后对水流流态的影响,探讨堵塞对上述两种人工湿地水流流态的影响。结果表明:对于潜流人工湿地(SFCW),堵塞前湿地植物缩短了水力停留时间(HRT),堵塞后延长了HRT;对于垂直流人工湿地(VFCW),堵塞前湿地植物对水流流态无明显影响,堵塞后延长了湿地内的HRT。堵塞对湿地内水流流态影响明显,潜流和垂直流湿地由于堵塞其HRT分别延长了12.3%,22.6%。堵塞后湿地对污水的净化能力都要强于堵塞前,但是湿地的污水处理量减小,堵塞严重时湿地丧失其污水净化功能。
The hydrauhc retention time （HRT） distribution of a constructed wetland and a control system without plants was studied using a NaCl tracer. The influence of the wetland plants on the flow pattem in subsurface flow constructed wetlands （SFCW） and vertical flow constructed wetlands （VFCW） before and after clogging are discussed. The results show that the HRT is shortened by wetland plants before clogging, and after clogging the result is the contrary in SFCW. In VFCW, the influence of wetland plants on the flow pattern is not observed before clogging, while after clogging HRT increases due to wetland plants. The influence of clogging on the flow pattern in constructed wetlands is obvious. Because of clogging, the HRT increases 12.3% in SFCW and 22.6% in VFCW. The constructed wetland after clogging has higher purification efficiency than the constructed wetland before clogging, but the wastewater treatment capacity of the constructed wetland will decrease and even reach zero if clogging is serious.
出处
《水资源保护》
CAS
北大核心
2008年第6期57-60,共4页
Water Resources Protection
基金
国家高技术发展研究计划(863)项目(2003AA601100-5)
