Liu Chang, Xiao Bo, Dauta Alain, Peng Guifen, Liu Shiming, Hu Zhiquan
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Bioresour Technol. 2009 Dec;100(24):6217-22. doi: 10.1016/j.biortech.2009.07.001. Epub 2009 Aug 3.
The effect of low power ultrasonic radiation on anaerobic biodegradability of sewage sludge was investigated. For this purpose, soluble substances and variation of microbial system of sewage sludge subjected to low power ultrasonic radiation were tested. The well known hydromechanical shear forces and heating effect of low frequency ultrasound plays a major role in the sludge pre treatment process. More, the increase of soluble substance may partly result from the destruction of microbial cell by excess ultrasonic pretreatment, which will inhibit the anaerobic process. By orthogonal tests, the optimal parameters were found to be an exposure time of 15 min, ultrasonic intensity of 0.35 W/cm(2) and ultrasonic power density of 0.25 W/ml. Under the optimal condition, anaerobic biodegradability of sewage sludge (R(vss/ss) %) was increased by 67.6%. Consequently, it can be concluded that low power ultrasonic pretreatment is a valid method for improving anaerobic biodegradability of sewage sludge.
研究了低功率超声辐射对污水污泥厌氧生物降解性的影响。为此，测试了低功率超声辐射作用下污水污泥中可溶性物质及微生物系统的变化。低频超声众所周知的流体力学剪切力和热效应在污泥预处理过程中起主要作用。此外，可溶性物质的增加可能部分源于过度超声预处理对微生物细胞的破坏，这会抑制厌氧过程。通过正交试验，发现最佳参数为：暴露时间15分钟、超声强度0.35瓦/平方厘米和超声功率密度0.25瓦/毫升。在最佳条件下，污水污泥的厌氧生物降解性（R(vss/ss)%）提高了67.6%。因此，可以得出结论，低功率超声预处理是提高污水污泥厌氧生物降解性的有效方法。
