植物滞留系统中磷污染物的迁移转化  

Transport and transformation of phosphorus contaminants in plant retention systems

作　　者：美英[1] 郝勇 高龙 MEI Ying;HAO Yong;GAO Long(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010000,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特市010000

出　　处：《环境工程学报》2023年第6期2037-2051,共15页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21667020);内蒙古自治区自然科学基金资助项目(2019MS05069)。

摘　　要：植物滞留系统作为一种低影响开发(LID)雨水管理措施,能有效去除雨水径流中的各种污染物。为探究磷污染物在介质中的运移机理尤其是介质中磷形态的运移,通过对填料层土壤介质施加不同添加剂对磷的去除效果,以及介质中各形态磷转化机理进行研究。结果表明:土壤介质添加剂为葡萄糖、淀粉时,加入淀粉的混合介质对磷的去除率比土壤介质高,对介质中稳定有机磷及中等稳定有机磷含量变化情况没有明显影响,但介质中铁磷有一定增加。与土壤介质相比,土壤与粉煤灰混合介质对磷的去除率明显提高,且混合介质中的水溶性磷、钙磷、铝磷增加量明显增大。改变人工模拟雨水pH的实验结果显示,在含氧量高的土壤介质表层,当模拟雨水pH为7~12,介质中的无机磷中水溶性磷的增加量明显;然而,当pH小于7时,介质中的无机磷中水溶性磷(Ads-P)的增加量微弱。柱实验表明,在植物滞留系统深度为40 cm处开始,随着深度的增加,雨水径流的出水中各类磷的质量分数降低趋势变得缓慢。其中,每组实验柱对磷去除率的平均值由大到小的顺序为:粉煤灰+砂土>砂土>淀粉+砂土。随着深度的增加,这3组实验柱介质中的铝磷和中等活性有机磷均减少。该研究成果可为植物滞留系统磷污染物的迁移转化提供参考。Plant detention systems as a low impact development(LID) stormwater management measure can effectively remove various pollutants from stormwater runoff.In order to investigate the transport mechanism of phosphorus pollutants in the media especially the transport of phosphorus forms in the media.The effect of phosphorus removal by applying different additives to the fill layer soil media and the mechanism of phosphorus transformation in each form in the media were investigated.The results showed that when the soil media additives were glucose and starch,the mixed media with the addition of starch had a higher removal rate of phosphorus than the soil media,and there was no significant effect on the change of stable organic phosphorus as well as medium stable organic phosphorus content in the media,but there was a certain increase of iron phosphorus in the media.Compared with the soil media,the mixed media of soil and fly ash showed significantly higher removal of phosphorus,and the increase of water-soluble phosphorus,calcium phosphorus,and aluminum phosphorus in the mixed media was significantly greater.The experimental results of changing the pH of artificial simulated rainwater showed that the increase of water-soluble phosphorus in inorganic phosphorus in the media was significant when the pH of simulated rainwater was in the range of 7-12 in the surface layer of soil media with high oxygen content,however,the increase of water-soluble phosphorus in inorganic phosphorus in the media was weak when the pH was less than 7.The column experiments showed that starting at a depth of 40 cm in the plant retention system,the tendency to reduce the effluent concentration of stormwater runoff became slower with increasing depth.The mean values of phosphorus removal rates for each of these experiment tal column groups in descending order were fly ash+sandy soil sandy soil starch+sandy soil.The aluminum phosphorus and moderately reactive organic phosphorus in the media of all three groups of experimental columns decreased wi

关 键 词：植物滞留系统 PH 土壤介质添加剂 有机磷 无机磷 

分 类 号：X703[环境科学与工程—环境工程]