Disintegration of sewage sludge with bifrequency ultrasonic treatment
Disintegration of sewage sludge with bifrequency ultrasonic treatment
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DOI：
10.2166/wst.2009.469
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发表时间：
2009-01-01
影响因子：
2.7
通讯作者：
Zhang, Qunfang
中科院分区：
文献类型：
--
作者：
Jiang, Jianguo;Yang, Shihui;Zhang, Qunfang
采用双频超声发生槽提高了浓缩池污泥的分解速度。对超声工作频率、功率、时间等参数进行了优化。超声波处理成功地瓦解了污泥的絮体结构，促进了污泥中Ca（2+）、Mg（2+）等有机物和金属离子的释放。超声处理后，污泥溶液中可溶性化学需氧量（SCOD）升高11.28 ~ 49.06%,Ca（2+）和Mg（2+）浓度分别升高5.5 ~ 25.0%和2.7 ~ 19.0%。25 kHz的超声频率对污泥的分解效果最好，高能量密度和较长的处理时间增加了SCOD和金属离子的释放。促进SCOD提高的最佳参数为25 kHz、75 W/L和60 s。在此条件下，双频超声比单频超声效果更好。
A bifrequency ultrasonic generating trough was used to improve disintegration of sewage sludge from thickener tanks. Ultrasonic operating parameters such as frequency, power, and time were optimized. Ultrasonic treatment successfully disintegrated the floc structure of sewage sludge and promoted the release of organic matter and metal ions such as Ca(2+) and Mg(2+). After ultrasonic treatment, soluble chemical oxygen demand (SCOD) in the sludge solution increased 11.28-49.06%, while the concentrations of Ca(2+) and Mg(2+) rose 5.5-25.0% and 2.7-19.0%, respectively. The ultrasonic frequency of 25 kHz was most effective in disintegrating sludge, and high energy densities and longer treatment time increased SCOD and metal ion release. The optimal parameters that promoted the increase SCOD were 25 kHz, 75 W/L and 60 s. Under these conditions, double-frequency ultrasonication was more effective than single-frequency ultrasonication.