Ultrasonic pretreatment for Enhancing Sludge disintegration and Resource Utilization: A mini review

As a byproduct of sewage treatment plants, sludge presents dual characteristics “resource” and “pollution”. While it enriches nutrients from wastewater, also contains portion toxic substances. Moreover, when the organic matter content is low, affects efficiency resource utilization energy recovery (sludge digestion efficiency, consumption incineration systems). Developing new physicochemical-biological combined pretreatment to enhance dissolution in disintegration) reduce solid crucial step improve dewaterability digestibility. Ultrasonic, as novel technology, gains advantages being environmentally sustainable, efficient, easily operable. It can disrupt flocs, alter microbial activity, release intracellular matter, be used combination with other processes. This article summarizes mechanism ultrasonic its research progress improving digestibility, providing perspective for application ultrasound utilization.