中文摘要：

采用容积为5 L的生物沥滤反应器,探讨了底物硫酸亚铁盐和单质硫粉的不同投配比、空气与CO2的曝气比对生物沥滤去除城市污泥中重金属过程的影响。结果表明,仅投加10 g/L S粉为底物时,污泥出现最低pH值为1.87;随着Fe2＋在Fe2＋和S粉混合物作为底物中占的比例逐渐增大时,最终pH值逐渐增加;采用6种不同曝空气强度进行生物沥滤实验,曝气强度控制为1 L/min时污泥酸化效果和重金属滤出效果最佳;在此基础上补充曝CO2,随着空气和CO2曝气比的增大,污泥酸化速率变化不大;在底物单质硫粉添加量为10 g/L、空气和CO2曝气量分别为1.0和0.03 L/min时,整个生物沥滤体系运行效果最佳,重金属As、Cd、Cr、Cu、Ni、Pb和Zn的去除率分别达到99.46%、92.02%、79.70%、92.12%、81.70%、86.58%和87.81%,同时有机质和氮磷钾的含量满足农用污泥的要求,处理后的污泥具有较高的农用价值。

英文摘要：

The aim of this study is to investigate the effect of different mixture ratio of ferrous sulfate, elemental sulfur and different aeration intensity of air and CO2 on the bioleaching of heavy metals in sewage sludge by 5 L volume of bioleaching reactor. Results show that the lowest pH of 1.87 is obtained with the elemental sulfur of 10 g/L as the only substrate in the sludge. Final pH value increases with the gradually increasing proportion of Fe2＋ accounting for the mixture of Fe2＋ and S. The results also indicate that 1 L/rain of air concentration is found to be best to bacterial activity and metal dissolution of the six aeration concentrations tested under the chosen experimental conditions. With the aeration ration of air and CO2, the acidification of sludge changes little on the basis of CO2 aeration. The most efficient running of bioleaching occurred at the aeration of air and carbon dioxide of 1.0 L/min, 0.03 L/min, the elemental sulfur of 10 g/L as the only substrate. Under the optimal conditions, the removal rate of seven heavy metals such as As, Cd, Cr, Cu, Ni, Pb and Zn is 99.46%, 92.02%, 79.70%, 92.12% ,81.70% ,86.58% and 87.81% respectively. Meanwhile, the content of organic matter and NPK still are satisfied the minimum requirements of the agricultural sludge though some losses. After bioleaching, sludge has high agricultural value and is suitable for the land utilization.