Remediation Experient On Groundwater Contaminated By Heavy Metals By Modified Christon

Resarch on migration and transformation in aquifer and the evaluation of its impacts on the environment can predict their behavior and determine the appropriate remediation technology. In this paper, the author simulated the migration of Cr6+ in ground water. The results formed the basis of installation of permeable reactive barrier. We also use the chitosan material to build a 5 cm thick wall (PRB), and observed the removal ability of Cr6+ in the simulation. The results showed:the peak concentration of Cr6+ appeared in turn and it did not decline with time. After installing PRB in the sand box, the chitosan material was filled in the PRB, the results showed:the time when the peak of Cr6+ occurred lagged behind than the previous experiment and there was a mark decrease in concentration, it showed that the adsorption material has a higher adsorption capacity.In this paper, the static adsorption properties of heavy metal such as Pb2+ in groundwater was studied by cross-linked chitosan material which were cross linked with PEG400. The results showed that:under CTS:PEG=1.1:1.5, the removal efficiency of Pb2+ was the highest. The study of static equilibrium adsorption isotherm showed:1) PEG-CTS inprinted Pb+ was close to the adsorption saturation after 20 h 2) PEG-CTS inprinted Pb2+ followed a rapid adsorption to the adsorbent in 0.5 h and followed the pseudo second dynamic model.The study of static equilibrium adsorption isotherm showed:the adsorption of Pb2+ on PEG-CTS was according to Langmuir adsorption isotherm model. Under temperature 20℃and pH=7 conditions, the maximum adsorption capacity of Pb2+ ion reached 20.22 mg/g. In order to increase the maximum adsorption, we use the "foam" technology, the experimental results showed that:the adsorption of Pb2+ on PEG-CTS was according to Langmuir adsorption isotherm model. Under temperature 20℃and pH=7 conditions, the maximum adsorptions capacity of Pb2+ reached 114.94 mg/g and 103.0928 mg/g. Compared to the material without using "foam" technology, the reduction of Pb+ was increased on the same condition and could be reused.Reuse of material indicates:The equilibrium adsorption capacity of Pb2+ ion modification did not decline after 4 time recycling.