采用改进的电动力技术去除铅锌矿尾砂中的 Pb,Zn,Cu。研究了铅锌矿尾砂中重金属在改进电动力技术处理情况下的去除情况。实验结果表明,经过7 d 的电动力实验,Pb、Zn 和 Cu 的总去除率分别为34%,33%,37%,其中酸溶态去除效果显著,分别达到66%,86%,81%。Pb 和 Cu 的铁锰氧化物结合态去除率为39%和42%,其他形态去除率较低,在10%左右。
Four chromium(Ⅵ)-resistant bacteria named YB-1,YB-2,YB-3 and YB-4 were isolated from Cr-electroplating sludge. YB-1 and YB-2 were identified as a member of Bacillus sp.based on morphology and Biolog Microstation System.The strain of YB-1 was selected to test for its resistance and ability to remove Cr(Ⅵ)from aqueous solution.The results indicate that YB-1 exhibits high MIC value which can almost reach 140 mg/L and the growth of YB-1 in liquid medium containing 60 mg/L Cr(Ⅵ)is affected especially in the late exponential phase and stationary phase.Furthermore,the potential of living and freeze-dried YB-1 biomass to remove Cr(Ⅵ)was studied in different pH,biosorbent dose,contact time and initial concentration using the batch method. At the optimal conditions,living and freeze-dried biomass are capable of absorbing 34.5 mg/g and 17.8 mg/g chromium(Ⅵ)at initial concentration of 60 mg/L,respectively.The adsorption data were fitted to Langmuir isotherm model for these two sorbents.Kinetic studies show that the rates of sorption all follow the pseudo-second order kinetics.
