Experimental Study on the Removal of Heavy Metal Ions from Water by Microognism
|School||Dalian University of Technology|
|Keywords||microognism heavy metal immobilized adsorption|
The rule of the adsorption to Cr2+、Zn2+、Cu2+by the aerobic bacterial microognism,which separated from the municipal sewage of Chun Liu He Sewage Treatment Plant inDalian City, was studied. Including the effect of conditions, immobilized and ironcoexisted.The result showed, under the condition of ion concentration low in100mg/L, pHbeing the most important factor, the concentration of heavy metal followed. The effect oftemperature and time were smaller. The best conditions to the pocess of adsorption to thesethree ions were similar, as pH=6、ion concentration30mg/L、tempratature20℃andadsorption time20min. Under the best adsorption conditions, repeated adsorption experimentwith immobilized microognism witch carried by sponge and chitin. The result proved that theadsorption active could be enhanced through immobilization, especially immobilized bychitin carrier. The removal rate to Cr2+、Zn2+、Cu2+reached59.25%、41.80%and90.65%usingimmobilized microognism with chitin carrier, however the figure was only30.05%、27.45and68%using common microognism under the same conditions. Some immobilized carrier itself,such as chitin, has certain adsoption capacity, but it could not affect the result.There wascompetition between heavy metal irons. The removal rate of metal iron, witch has a betteraffinity for microognism, was higher than others. The order of the affinity for microognismwas Cu2+＞Cr2+＞Zn2+.