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《Modern Agricultural Sciences and Technology》 2010-06
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Study on Arsenic Desorption Regularity of Polluted Sediment

BEI Rong-ta 1,2 WANG Le 1 ZHENG Cai-qing 1 ZHANG Ye-xin 1(1 Department of Environment Science & Engineering,Southwest Forestry College,Kunming Yunnan 650224;2 College of Environment Science & Engineering,Kunming University of Science and Technology)  
Based on the relationship between arsenic desorption of bottom material and hydraulic power,and the relationship between laying time quietly and arsenic deposition,the desorption law of arsenic in polluted sediment was studied.The results showed that stirring mixtures may promote arsenic desorption of bottom material.Rotational speed influenced remarkably on arsenic dissolved content,that was,the faster the stiring machines rotational speed,the more the dissolved arsenic content.After the mixtures being laid quietly some time,the arsenic content in the water was reducing gradually.However,the arsenic concentration reduced slowly.Even if the mixtures were laid quietly for 4 hours,the arsenic content in the water equals still to 3~5 times of the fifth grade of surface water standard.The researches also indicated that the dissolved arsenic content was not significant different among the rotational speeds after the mixtures being laid 30 minutes.
【Fund】: 西南林学院重点基金资助项目(200607Z)
【CateGory Index】: X52
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