Multifaceted Effects of Ultrasonic Enhanced Fe-C/Pds System for Sludge Dewatering and Resource Utilization: Synergy of Oxidation and Cracking Processes

作     者：Li, Wenye Xie, Binghan Li, Qinghao Li, Zhipeng Zhu, Jing You, Hong Zhang, Guoyu Li, Weirun Xing, Xiaodi Zeng, Fanbo Li, Lingjie Zhao, Shuyu Shang, Zhiwei Wang, Shuxiao 

作者机构：Harbin Institute of Technology Weihai Sch Marine Sci & Technol Weihai264209 China Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm Harbin150090 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Dewatering 

摘      要：The effective dewatering of waste activated sludge (WAS) and the utilization of resources are crucial for the sustainable development of wastewater treatment plants. In this study, ultrasonic (US) collaborative Fe-C activated peroxydisulfate (PDS) coupling system was constructed to investigate the shift in physicochemical properties and explore the mechanisms during the cracking and oxidation of WAS. The US enhanced Fe-C/PDS system exhibited excellent oxidation capacity with the water content (Wc) of sludge cake and the specific resistance to filtration (SRF) reducing to 61.71% and 1.12×1012 m/kg under the conditions of PDS, Fe-C, and US power levels at 120 mg/g TS, 300mg/g TS, and 150W. Furthermore, the high cracking capacity led to a rise in soluble chemical oxygen demand to 630.64 mg/L and a 9.16% reduction in volatile solids. Compared to Fe-C/PDS, the addition of US enhanced the leaching of Fe, promoted to the formation of reactive oxidative species. The contribution of ·O2-and 1O2 to sludge conditioning was 37% and 43.17%, indicating the oxidation process of free radicals and non-free radicals in Fe-C/PDS/US system. Additionally, US improved the cracking capacity of the system, releasing bound extracellular polymeric substances (EPS) and degrading into soluble properties. The concentration of short-chain fatty acids (SCFAs) in the sludge was increased by 96.7%, which significantly improved the quality of carbon source suitable for recycling. The positive improvement of sludge physicochemical properties revealed the decryption-degradation synergistic effect of the coupled systems. These findings provide a novel strategy for effective disposal and reduction in WAS while also offering valuable insights into resource utilization. © 2024, The Authors. All rights reserved.