Chemical Engineering Department, King Faisal University, P.O. Box 380, Al-Ahsa 31982, Saudi Arabia.
International Maritime College, National University of Science and Technology, P.O. Box 532, Sohar, Oman E-mail:
Water Sci Technol. 2024 May;89(10):2593-2604. doi: 10.2166/wst.2024.132. Epub 2024 May 6.
The number of published literature on the effect of ultrasonic cavitation and advanced oxidation pretreatment on the dewatering performance of anaerobically digested sludge is very limited. This study aims at determining the optimum operating conditions of large-scale filtering centrifuges in wastewater treatment plants. The optimum dose of hydrogen peroxide, ultrasonic power, ultrasonic duration, ultrasonic pulse and particle size distribution for improved dewatering performance were determined in this study. In addition, shear stress-shear rate and viscosity-shear rate rheograms were developed to show the rheological flow properties for varying ultrasonic power and treatment duration. Optimum sonication power, time, pulse and amplitude were determined to be 14 W, 1 min, 55/5 and 20%, respectively. At a pH of 6.8, the optimum concentration of hydrogen peroxide was found to be 43.5 g/L. The optimum hydrogen peroxide dose in the combined conditioning experiments was determined to be 500 mg/L at a pH of 3. Under these optimum conditions, capillary suction time was reduced significantly by 71.1%. This study helps to reduce polymer consumption and provides the optimum pretreatment and dewatering operating conditions, and better monitoring and control in the dewatering unit has significant impact in the overall economy of wastewater treatment plants.
关于超声空化和高级氧化预处理对厌氧消化污泥脱水性能影响的文献数量非常有限。本研究旨在确定污水处理厂大型过滤离心机的最佳运行条件。本研究确定了改善脱水性能的最佳过氧化氢剂量、超声功率、超声持续时间、超声脉冲和粒度分布。此外，还开发了剪切应力-剪切速率和粘度-剪切速率流变图，以显示不同超声功率和处理时间的流变流动特性。最佳超声功率、时间、脉冲和幅度分别确定为 14 W、1 分钟、55/5 和 20%。在 pH 值为 6.8 时，发现过氧化氢的最佳浓度为 43.5 g/L。在 pH 值为 3 的联合调理实验中，确定最佳过氧化氢剂量为 500 mg/L。在这些最佳条件下，毛细抽吸时间显著减少了 71.1%。本研究有助于减少聚合物的消耗，并提供最佳的预处理和脱水操作条件，更好的监测和控制在脱水单元在整个污水处理厂的经济具有重大影响。
