Decontamination of Heavy Metals in Wastewater by Transgenic Synechococcus sp.PCC 7002 with Mouse Metallothionein-I Gene

The growth characteristics and the decontamination of heavy metals in analogous heavy metals wastewater by transgenic Synechococcus sp.PCC 7002 with mouse metallothionein-Ⅰ gene were studied.The results show that transgenic Synechococcus sp.PCC 7002 not only has a higher tolerance to heavy metals,but also has a higher growth rate than wild strain.The concentration of Cd~(2+),Pb~(2+) and Hg~(2+) decreases with the progress of cultivation,and its maximum decreasing extent occurs at 1～3 day.After three days of cultivation,the absorption of Cd~(2+),Pb~(2+) and Hg~(2+) by transgenic Synechococcus sp.PCC 7002 is 10.75,58.89 and 112.61(mg·g~(-1)) of dried cells respectively,which is 3.16,2.18 and 100.45 times higher than wild cells.The mono-factor and overall model developed fit the experiment data well.