| 硫杆菌对固化污泥中重金属浸出的影响 |
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| 中文关键词 污泥 固化 硫杆菌 重金属 |
| 英文关键词 sludge solidification Thiobacilli heavy metal |
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| 中文摘要 |
| 污泥固化后能够降低重金属的浸出风险，但是污泥中硫杆菌的活动存在再次将重金属浸出的可能。针对这种问题采用生物反应器强化固化污泥中硫杆菌的活性，研究了污泥固化前后硫杆菌的活性及重金属浸出的变化。试验结果表明污泥经过固化处理后其中的硫杆菌仍然存在一定的活性，硫杆菌的活动能够降低固化污泥的pH值同时造成氧化还原电位的升高，重金属的浸出量有所增加；但是随着固化水平的提高硫杆菌的活动受到抑制的程度越来越高，当固化水平达到5:2:2时硫杆菌已基本停止活动，不能对重金属浸出产生影响；随着固化龄期的增加硫杆菌的活性也在减弱，达到某一龄期时其活性趋于稳定，重金属浸出也趋于稳定；固化污泥中硫杆菌生物量小于某一极限值时生物沥滤难以启动，不会对重金属的浸出产生显著影响。 |
| 英文摘要 |
| Leaching risk of heavy metal from sludge can be reduced due to solidification. But heavy metal in solidified sludge could be leached again because of Thiobacilli activity in the sludge. In order to clarify the above problem, bioreactor test was employed to enhance activity of Thiobacilli in the solidified sludge. Result shows that there was existing activity of Thiobacilli which may reduce pH and increase ORP and increase the leaching quantity of heavy metal. But further result indicated that with increasing solidification level, activity of Thiobacilli was restrained. When the solidification level reaches 5:2:2, the activity of Thiobacilli would be stop. Lengthening curing time also restrains the activity of Thiobacilli and leaching of heavy metal tends to be stabilized. When the quantity of Thiobacilli less than limited value, the bioleaching would not happen and Thiobacilli have no effect on leaching of heavy metal. |
