摘要
随着城市化进程的不断推进,城市河流底泥中内源氮磷污染问题日益突出.为研究原位洗脱技术对污染底泥中氮、磷物质和成分的作用效果,以北京市凉水河作为研究对象,分别比较了现场试验洗脱与对照组0~30 cm分层底泥以及实验室模拟洗脱处理前后0~10 cm底泥中pH、E_h(氧化还原电位)、容重、含水率、OM(有机质)、TN、TP和氮、磷形态分布的变化特征.结果表明:①现场洗脱对0~5 cm厚度底泥的处理和模拟洗脱处理均对底泥中pH、E_h、含水率的改变以及其中TN、TP的去除效果表现显著,其中,现场试验洗脱组0~5 cm范围底泥中w(TN)、w(TP)分别较对照组降低了66.4%±17.4%、40.8%±24.4%,模拟洗脱处理对底泥中OM、TN、TP的去除率分别达70.1%±4.8%、66.8%±2.0%、43.1%±3.1%.②原位洗脱技术对底泥中TN的去除主要通过对PON(颗粒态有机氮)的去除来实现,现场和模拟试验过程中PON对TN去除的贡献率分别达55.0%和73.6%.③原位洗脱对底泥中TP的去除主要通过对Al-P(铝结合态磷)、OP(有机磷)的去除来实现,现场和模拟试验中Al-P、OP对TP去除的贡献率分别达37.0%、66.2%和31.3%、43.7%.研究显示,原位洗脱技术可有效去除城市河流底泥处理层中的氮磷物质,并以有机氮、磷物质的去除为主.
The internal pollution from nitrogen(N)and phosphorus(P)of sediment in urban rivers has been increasingly notable with the urbanization.In order to study the removal efficiency of in-situ physical elution technology,sediments from Liangshui River in Beijing were selected as subject.The distribution characteristics of pH,E h,volume weight,moisture content,organic matter(OM),TN,TP as well as N and P forms among treatment and control group on-site(depth from 0 to 30 cm)so as the simulated test(depth in 10 cm)in laboratory were compared and studied in the pre and post of treatment.The results were as follows:(1)Change of pH,E h,moisture content as well as removal of nutrients in sediments were significant both in on-site(depth in 0-5 cm)and simulated(depth in 10 cm)treatments.The content of TN and TP of on-site engineering group(depth in 0-5 cm)were reduced by 66.4%±17.4%and 40.8%±24.4%,respectively.The removal rate of OM,TN,TP were reached 70.1%±4.8%,66.8%±2.0%and 43.1%±3.1%in simulated treatment,respectively.(2)The removal of TN was mainly achieved by the reduction of particulate organic nitrogen(PON),whose contribution ratios to TN-removal on site and in simulated test reached 55.0%and 73.6%,respectively.(3)The removal of TP was mainly achieved by the reduction of Al-bound P(Al-P)and organic P(OP)whose contribution ratios to TP-removal on site and in simulated test reached 37.0%,66.2%and 31.3%,43.7%,respectively.In summary,the results showed that the in-situ physical elution technology has an obvious removal on the N and P content of sediment in urban rivers,especially the organic N and P components.
作者
李国宏
叶碧碧
吴敬东
侯泽英
储昭升
郑丙辉
杨永哲
LI Guohong;YE Bibi;WU Jingdong;HOU Zeying;CHU Zhaosheng;ZHENG Binghui;YANG Yongzhe(School of Environmental and Municipal Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Institute of Lake Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Beijing 100012,China;Anhui Lake Environment Technology Ltd.Corporation,Hefei 230041,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2020年第2期392-401,共10页
Research of Environmental Sciences
基金
国家水体污染控制与治理科技重大专项(No.2017ZX07401003)~~
关键词
底泥修复
城市河流
底泥
氮形态
磷形态
sediment remediation
urban river
sediment
nitrogen forms
phosphorus forms
