重金属对活性污泥微生物活性的影响

本研究采用简单活性污泥法,使用对重金属中毒较为敏感的脱氢酶活性和更贴近活性污泥实际情况的耗氧速率作为活性污泥微生物中毒的评价指标,研究了铅、汞、铜、锌、铬(Ⅲ)五种重金属对活性污泥中微生物活性的影响。研究结果表明,五种重金属对活性污泥中微生物活性均有抑制作用,当重金属浓度达到45 mg/L时,五种重金属对活性污泥有机物降解能力的抑制率分别达到45.52%,50.44%,61.51%,27.94%,26.19%;对活性污泥脱氢酶活性抑制率分别达到62.49%,82.43%,79.17%,60.41%,62.39%。五种重金属对活性污泥的毒性大小为:铜汞铅铬锌。

Heavy Metal Effects on Microbial Activity of Activated Sludge

This research adopts simple method of activated sludge, the use of toxic heavy metals sensitive dehydrogenase activity and more close to the actual situation of the activated sludge oxygen consumption rate as activated sludge microbial poisoning evaluation index, lead, mercury, copper, zinc, cr （1ll） five kinds of heavy metals in microbial activity of activated sludge. Research results show that the five kinds of heavy metals in microbial activity of activated sludge were inhibited, when heavy metal concentrations reach 45mg/L, five metals of organic matter degradation ability of activated sludge inhibition rate reached by 45.52 and 50.44 %, 61.51%, 27.94 %, 26.19 %, Activated sludge dehydrogenase activity to restrain 62.49 % 82.3 %, 82.43 %, 79.17 %, 60.41%, 62.39 %. Five kinds of activated sludge of toxic heavy size; copper 〉 〉 〉 〉 mercury lead zinc chrome.