Changes of chemical fractions of Cd in the mixed substrates of constructed wetland
Five mixed substrates for constructed wetland were constructed to absorb Cd in water,and different Cd fractions were monitored during the operation period.The results indicated that there were significant differences in the Cd concentration of each fraction among the mixed substrates at the end of the operation.The Cd in exchangeable fraction among different substrates had significant variation.Compared to the other three fractions,the Cd concentration in organic matter and residual fractions was relatively steady and low.The Cd in exchangeable,carbonate and Fe-Mn oxide fractions was dominant in the total Cd,while the organic matter and residual fractions were only small part of it.The Cd concentration in all fractions increased with increasing operation time,and the changes of organic matter and residual Cd were relatively not obvious.
Chemical fraction Cd mixed substrates constructed wetland
Ling Tao Tianyu Bai Jun Ren Yijie Wang Shenghong Shi
School of Environmental and Municipal EngineeringEngineering Research Center for Cold and Arid Regions Water Resource Comprehensive Utilization, Ministry of Education,Lanzhou Jiaotong University Lanzhou, China
国际会议
兰州
英文
1-4
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）