摘要
将多孔质生态河床技术引入生态型灌区受损水体修复中.在冬季低温条件下,通过室内试验,延续了前期研究,采用仿生植物填料丝改良了块石多孔质生态河床,并与碎石多孔质生态河床对比,分析了两种河床模型对污染水体的净化效果.结果表明:采用仿生植物填料丝改良的块石多孔质生态河床是修复受损水体较理想的方法,它可以有效地降低由于水力条件的改变对河床的扰动,减轻由于底质污染物向上覆水体的再释放而导致的二次污染程度,还有利于增加河床的比表面积,增加微生物的数量和种类,提高河流的自净能力.此外,对比分析了两种河床模型对TP,TN、NH4+-N和CODMn去除机制.
Under the low temperature condition in winter, the purification efficiency of modified porous riverbed was experimentally studied in laboratory. The modified porous riverbed model was constructed of gravel and bionic filler~ and the other porous riverbed model constructed of macadam was tested as a contrast. It is concluded that the modified porous riverbed was an ideal choose for restoring the polluted water body in ecoirrigation district. The disturbing causing by the change of hydraulic condition was mitigated; so that the release of pollutant in riverbed to the overlay water volume decreased as well. Furthermore, the modification by bionic filler increased the surface area efficiently, which can help to increase the quantity and species of microorganism, thereby the self-purification of river system can be improved. The purification mechanisms of TP, TN, NH4^＋-N and CODMn were analyzed.
出处
《三峡大学学报（自然科学版）》
CAS
2008年第1期44-48,共5页
Journal of China Three Gorges University：Natural Sciences
基金
国家高新技术研究“863”项目(TK-2-4)
