模拟分析白骨壤湿地系统中Ni的分配循环及其净化效果

在温室中建立红树林植物白骨壤模拟湿地系统,分别用正常、5倍和10倍浓度的人工配置的城市污水每周定时定量对模拟系统污灌2次,用海水作对照,持续1 a.研究重金属Ni在系统中的分配、循环和被净化的效果以及系统对Ni的承受能力.结果表明：加入系统的Ni主要留存在土壤中,很少迁移到植物体和凋落物中.模拟系统对重金属Ni的净化效果显著,达到92%以上.根据物质平衡模型计算得土壤子系统Ni的环境容量较大,因此整个模拟系统对Ni污染的承受力较大.

Allocation, circulation and purifying effect of nickel in synthetic wastewater in Avicennia marina simulated wetland system

A simulated mangrove wetland was set up in a greenhouse and the experiment was performed to research the behavior of nickel in synthetic wastewater in Avicennia marina simulated wetland system.The synthetic wastewater of three different concentrations,namely NW,FW and TW and artifical seawater(control) of 15 salinity were discharged into the wetland in fixed quantity twice a week for a year.NW has the characteristics and strength similar to normal municipal sewage,while FW and TW contained five and ten times of nutrients and heavy metals as that in NW respectively.The results showed that the most nickel in the artificial wastewater discharged into the system remained in soil and only a small portion entered into the plant subsystem.The simulated wetland system has the significant purifying effect on nickel in synthetic wastewater.As the environmental capacity of nickel in soil subsystem was calculated according to the model of matter balance,the simulated wetland has a high capacity for bearing nickel.