鼠李糖脂对生物淋滤除制革污泥中铬的影响

Effect of Rhamnolipid on Bioleaching of Cr from Tannery Sludge

通过接种经生物表面活性剂鼠李糖脂驯化培养的制革污泥土著混合硫杆菌，研究不同浓度的鼠李糖脂对制革污泥中Cr溶出效果的影响；同时探讨不同浓度的鼠李糖脂对混合硫杆菌氧化硫能力影响。结果表明，投加0．5～1g／L鼠李糖脂能促进混合硫杆菌氧化元素硫；并随着投加量的增加，元素硫的氧化率提高。在制革污泥生物淋滤中，鼠李糖脂最佳投加量是1．0g／L，经过12d的淋滤，镉的溶出率达到83．98％；而对照组Cr的溶出率为60．14％。

The effect of biosurfactant Rhamnolipid on the bioleaching of tannery sludge with indigenous sulfur- oxidizing bacteria cultured by Rhamnolipid was examined. The effect of the different concentrations of Rhamnolipid on the sulfur oxidizing capacity of the bacteria was explored. The results showed that adding the dosage of Rhamnol- ipid in 0.5 - 1 g/L can promote oxidation of elemental sulfur by bacteria, and with the increasing of Rhamnolipid, the oxidation rate of elemental sulfur enhanced. The optimal concentration of Rhamnolipid was 1.0 g/L, under the condition, the dissolution rate of Cr was 83.98% after 12 d of bioleaehing. In contrast, only 60. 14% Cr was ex- tracted from the control without Rhamnolipid.