Department of Civil and Environmental Engineering, Carleton University, Ottawa, Ontario, Canada.
Water Environ Res. 2010 Jan;82(1):51-61.
Recent studies have reported significant increases in fecal coliform counts in anaerobically digested sludge soon after centrifuge dewatering. The reasons behind these increases are not yet understood. This study investigated the role of inhibitor substances on the reactivation and regrowth of sludge bacteria and the effect of storage time and temperature on their growth behavior. The study consisted of full- and laboratory-scale testing, and quantified the microbiological and chemical characteristics of sludge, cake, and centrate samples under different temperatures and aging times. Significant reactivation was not observed at the treatment plants tested. Results showed that the regrowth phenomenon is not observed for all sludges, and differences in sludge characteristics and treatment processes may play a role in determining the regrowth behavior of sludge. Centrate collected from one of the treatment plants had an inhibitory effect on the growth of fecal coliform and was four times more toxic than cake to the bacteria. Chemical analyses of the centrate identified sulfide as one of the possible inhibitory compounds. The results also showed that fecal coliform have different growth and survival behavior compared to other sludge bacteria.
最近的研究报告指出，在离心机脱水后不久，厌氧消化污泥中的粪便大肠菌群数量显著增加。这些增加的原因尚不清楚。本研究调查了抑制剂物质对污泥细菌的再活化和再生的作用，以及储存时间和温度对其生长行为的影响。该研究包括全规模和实验室规模的测试，并量化了不同温度和老化时间下污泥、饼和浓缩物样品的微生物学和化学特性。在测试的处理厂中未观察到明显的再活化。结果表明，并非所有污泥都观察到再生现象，污泥特性和处理工艺的差异可能在决定污泥的再生行为方面发挥作用。从一个处理厂收集的浓缩物对粪便大肠菌群的生长具有抑制作用，并且对细菌的毒性比饼高四倍。浓缩物的化学分析确定了硫化物是可能的抑制化合物之一。结果还表明，粪便大肠菌群与其他污泥细菌相比具有不同的生长和存活行为。
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