Sludge dewatering has proven to be an effective method to reduce the volume of sludge. In this study, drinking water treatment sludge (DWTS) was treated by ultra-sonication under variable conditions comparing two sonoreactor types (bath and probe), four frequencies(25, 40, 68, 160 kHz) and four energy density levels(0.03, 1, 3, 5W/mL). The effects of these conditions were studied using specific resistance to filtration and capillary suction time as measures of dewaterability, and floc size, the Brunauer, Emmett and Teller (BET) specific surface area and Zeta potential to determine treated sludge characteristics. The results indicated that the dewaterability of sonicated sludge improved at relatively low energy densities of 0.03 and 1.0 W/mL, while an optimum for sonication duration (within 10min) was also identified. Higher frequencies (tested up to 160 kHz) with acoustic energy density of 0.03 W/mL also reduced the dewatering property. At higher energy densities of 3.0 and 5.0 W/mL, dewaterability of sludge deteriorated regardless of ultra-sonication time, with an increase of solubilized organic matter content and severely changed floc characteristics. The deterioration of the dewatering capacity was closely related to the considerably reduced floc sizes, dissolution of proteins and polysaccharides, and to the Zeta potential of sonciated sludge flocs. The dewaterability was not correlated with BET specific surface area. Mechanistic explanations for the observations were discussed by analyzing corrosion patterns of aluminum foil as a measure for cavitation field distribution.

污泥脱水已被证明是减少污泥量的有效方法。在这项研究中，对饮用水处理污泥（DWTS）在不同条件下进行了超声波处理，比较了两种超声波反应器类型（浴和探头），四种频率（25、40、68、160 kHz）和四种能量密度水平（0.03， 1，3，5W / mL）。研究了这些条件的影响，使用对过滤的比抗性和毛细管抽吸时间作为脱水性和絮凝物尺寸，Brunauer，Emmett和Teller（BET）比表面积和Zeta势的量度，以确定处理后的污泥特性。结果表明，在相对较低的能量密度（0.03和1.0 W / mL）下，超声处理的污泥的脱水性能得到了改善，同时还确定了超声处理持续时间（10分钟以内）的最佳值。声音能量密度为0.03 W / mL的更高频率（经测试高达160 kHz）也降低了脱水性能。在3.0和5.0 W / mL的较高能量密度下，无论超声处理时间如何，污泥的脱水性都会下降，溶解性有机物含量会增加，絮凝特性会发生严重变化。脱水能力的下降与絮凝物尺寸的显着减小，蛋白质和多糖的溶解以及声处理的污泥絮凝物的Zeta电位密切相关。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。03 W / mL也降低了脱水性能。在3.0和5.0 W / mL的较高能量密度下，无论超声处理时间如何，污泥的脱水性都会下降，溶解性有机物含量会增加，絮凝特性会发生严重变化。脱水能力的下降与絮凝物尺寸的显着减小，蛋白质和多糖的溶解以及声处理的污泥絮凝物的Zeta电位密切相关。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。03 W / mL也降低了脱水性能。在3.0和5.0 W / mL的较高能量密度下，无论超声处理时间如何，污泥的脱水性都会下降，溶解性有机物含量会增加，絮凝特性会发生严重变化。脱水能力的下降与絮凝物尺寸的显着减小，蛋白质和多糖的溶解以及声处理的污泥絮凝物的Zeta电位密切相关。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。随着可溶性有机物含量的增加和絮凝特性的严重改变。脱水能力的下降与絮凝物尺寸的显着减小，蛋白质和多糖的溶解以及声处理的污泥絮凝物的Zeta电位密切相关。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。随着可溶性有机物含量的增加和絮凝特性的严重改变。脱水能力的下降与絮凝物尺寸的显着减小，蛋白质和多糖的溶解以及声处理的污泥絮凝物的Zeta电位密切相关。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。脱水能力与BET比表面积不相关。通过分析铝箔的腐蚀模式作为气蚀场分布的量度，讨论了对观测结果的机械解释。