草酸青霉SL2处理高盐含Cr(VI)电镀废水的试验研究

Experiment of application of Penicillium oxalicum SL2 in Cr(VI) removal from high-salinity electroplating wastewater

为探究草酸青霉(Penicillium oxalicum)SL2处理环境中Cr(VI)污染的潜力,利用Gompertz模型分析盐度对SL2生长的影响,通过摇瓶试验研究盐度对SL2处理Cr(VI)的影响,并考察SL2清除实际电镀废水中Cr(VI)的能力.与未添加Na Cl的对照组相比,在添加100 g/L Na Cl的土豆培养基中生长的SL2菌斑最大直径和最大生长速率分别降低19.1%和57.8%,延滞时间增加110.1%,但SL2处理Cr(VI)的能力没有受到显著抑制.在实际电镀废水中,SL2能通过吸附累积和还原作用在6 d内清除102.2 mg/L的Cr(VI),每克菌丝体吸附累积铬元素9.09 mg,吸附累积量占电镀废水中铬元素总量的9.9%.研究表明,SL2具有处理高盐电镀废水中Cr(VI)污染的潜力,研究结果可为实际应用提供参考依据.

In order to explore the potential application in Cr（VI） removal of Penicillium oxalicum SL2 from polluted environment, the effect of salinity on SL2 growth was analyzed by using the Gompertz model, the effect of salinity on Cr（VI） removal ability of SL2 was investigated by using a shaker test, and the ability of SL2 to remove Cr（VI） from actual electroplating wastewater was also tested. The relative maximum colony diameter and the maximum growth rate of SL2 in potato dextrose agar medium with 100 mg/L Na Cl decreased by 19.1% and 57.8% respectively, when compared with the parameters of SL2 in medium without Na Cl. However, the Cr（VI） removal ability of SL2 was not significantly inhibited. SL2 showed the ability to remove 102.2 mg/L Cr（VI） from the actual electroplating wastewater in 6 days by uptake and reduction.Cr uptake by SL2 was 9.09 mg/g dry biomass, which took up 9.9% of the amount of Cr in in the wastewater. The results suggest SL2 has the potential to deal with Cr（VI） pollution in the high-salinity electroplating wastewater, which provides references for Cr（VI） removal in practice.