梯级生态浮床系统处理黑臭河水除磷性能研究

Study on the effect of SFTWs for phosphorus removal from malodorous water

以上海市某黑臭河道为处理对象,通过模拟天然水体中水生植物的分布,构建逐级下沉式梯级浮床系统(Staged Floating Treatment Wetlands,SFTWs),分析温度、植物种类、pH值和溶解氧(DO)等因素对浮床系统的除磷性能的影响.结果表明,浮床系统的除磷率受温度变化较为明显,一定温度范围内两者呈正相关,在最低温度15.2℃时,总磷(TP)和溶磷(PO43--P)去除率分别达到最小值59%和62%.不同植物单元中,磷去除主要发生在挺水植物香菇草(Hydro-cotyle vulgaris)单元,TP去除率平均值高达62.3%,对磷去除作用显著;pH值越大越有利于除磷,DO浓度也对系统除磷效果有影响.

The staged floating treatment wetlands（SFTWs） were constructed to treat malodorous water of an industrial river in Shanghai by simulating the ecological distribution of aquatic plants in the natural water,focusing on the effect of the season and temperature,plant species,pH,dissolved oxygen（DO） and other factors on the phosphorus removal rate.The results showed that the temperature changes did an obvious effect on the phosphorus removal efficiency of floating bed system where a positive correlation was in a certain temperature range.Total phosphorus（TP） and dissolved phosphorus（PO3-4-P） removal rates reached 59% and 62% minimum respectively when the lowest temperature was 15.2 ℃.Among different species of water plants,emergent plant such as Hydrocotyle vulgaris unit removed the most phosphorus with a removal rate of 62.3%.The phosphorus removal efficiency increased when pH value rise.The DO also had an effect on phosphorus removal.