@article{article_223921, title={Effects of Ultrasonic Treatment on the Waste Activated Sludge}, journal={Mühendislik Bilimleri ve Tasarım Dergisi}, volume={1}, pages={28–32}, year={2010}, url={https://izlik.org/JA22ED92LX}, author={Civelekoğlu, Gökhan}, keywords={−Kavitasyon, bozunma, çamur arıtımı, ultrason, atıksu arıtımı}, abstract={<p>Many of the organic compounds make up much of the sludge mass in particulate form and thus require hydrolysis, which is a rather slow process. In order to improve the hydrolysis, some other physical and chemical pretechniques such as thermal hydrolysis, mechanical disintegration, ultrasonic irradiation (ultrasonication), ozone treatment, acidification, and alkaline supplement are applied. Two of these techniques, those are ozone treatment and ultrasonication are generally regarded as environmentally non-hazardous. This preference of ultrasonication is based on the view that this method, as a speed fixing instrument, reduces the time limit of hydrolysis from 20 to 8 days; improves the quality and quantity of the biogas as an end-product; helps microbiological cells break into intracellular entities. The current studies have proved a lengthy ultrasonication period, a low-frequency ultrasonic wave and a high ultrasonic intensity are highly effective for the sludge disintegration. The aim of this work was to review the current studies on the issue mentioned above and presented a brief summary of the results.  <br /> </p>}, number={1}