Characteristic of ammonia nitrogen adsorption on karst underground river sediments

Karst aquifers are one of the most important aquifers in Southwestern China. One of the characteristics of karst aquifers is the enhanced permeability permits high flow velocities are capable of transporting suspended and bedload sediments. Mobile sediment in karst may act as a vector for the transp...

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Bibliographic Details
Published inHuanjing kexue Vol. 32; no. 2; p. 501
Main Authors Guo, Fang, Chen, Kun-Kun, Jiang, Guang-Hui
Format Journal Article
LanguageChinese
Published China 01.02.2011
Subjects
Adsorption
Ammonia - isolation & purification
Geologic Sediments - chemistry
Nitrogen - isolation & purification
Rivers - chemistry
Water Pollutants, Chemical - isolation & purification
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Summary:Karst aquifers are one of the most important aquifers in Southwestern China. One of the characteristics of karst aquifers is the enhanced permeability permits high flow velocities are capable of transporting suspended and bedload sediments. Mobile sediment in karst may act as a vector for the transport of contaminates. 14 sediment samples were collected from two underground rivers in two typical karst areas in Liuzhou city, Guangxi Autonomous Region, China. According to simulated experiment methods, characteristic of adsorption of ammonia nitrogen on sediment was studied. The results of ammonia nitrogen adsorption dynamics on sediments showed that the maximum adsorption velocity was less than 2 h. The adsorption balance quantity in 5 h accounted for 71% - 98% of the maximum adsorption quantity. The maximum adsorption quantity of ammonia nitrogen was 385.5 mg/kg, which was sediment from a cave in the middle areas of Guancun underground river system. The study of isotherm adsorption indicated adsorption quantit
ISSN:0250-3301