Removal of Cadmium from Contaminated Water

摘要

Over the past 15 years, about one half million sites with potential contamination have beenreported to federal or state authorities. Of these, about 217,000 sites still need remediation(1) and new contaminated sites continue to appear each year. The most common type ofcontaminants are metals, solvents and petroleum products. Heavy metals are present in twothirds of DOD and superfund sites and about 50% of DOE and RCRA sites.AAM is a new material that possesses the ability to remove heavy metal from conaminatedwater. AAM consists of fly ash activating chemicals and fillers. AAM barrier material wasused to remove Cd from contamination water. Fly ash from three different sources were usedto produce reactive barrier of different permeability. AAM materials with permeability 10-2to 10-1 was created. Only highest permeability proved to be viable for reactive barriermaterial. AAM barrier from three ash sources with permeability of 10-1 was produced andcrushed into pelletized form. To determine effectiveness of the various barriers batch testwas performed, based on that result the column test was conducted.In this work contamination barrier with controled permeabilty was tested to determine itsability to remove Cd from contaminated water. AAM barrier material was used in columntest to remove Cd from 1000 ppm and 10 ppm solution. The results show that AAM barrier isvery effective in removing Cd from highly contaminated water (up 99% efficiency).