Xu Xianzhen, Cao Dan, Wang Zonghua, Liu Jin, Gao Jun, Sanchuan Minlang, Wang Zhenjun
College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles, Laboratory of Fiber Materials and Modern Textile, Qingdao University, Qingdao 266071, China; University of Shanghai for Science and Technology, Shanghai 20093, China.
College of Engineering, Ocean University of China, Qingdao 266100, China; University of Shanghai for Science and Technology, Shanghai 20093, China.
Ultrason Sonochem. 2019 Oct;57:29-37. doi: 10.1016/j.ultsonch.2019.05.008. Epub 2019 May 8.
Ultrasonic technique has attracted wide attention due to its advantages of no secondary pollution, high decomposition speed and simple equipment in the treatment of municipal sludge. In this paper, study on ultrasound-chemical treatment for municipal sludge in investigated. Results indicate that ultrasonic waves can destroy sludge floc structure and cell walls, release intracellular organic matter, and accelerate the hydrolysis process; ultrasonic can improve the sedimentation and dewatering performance of sludge; ultrasonic wave can produce a sponge effect on sludge, which makes the water flow through the channel more easily from the wave surface, thereby agglomerating the sludge particles and increasing the particle size; ultrasound can promote coagulation; ultrasound can also improve the activity of excess sludge, and improve the efficiency of anaerobic digestion process and the final biogas production. Ultrasound-Cationic polyacrylamide (CPAM) treatment can undermine the repulsion between particles to a certain extent and destabilizes sludge flocs. In addition, the adsorption and bridging action of the flocculant CPAM further agglomerates the sludge particles, and the water in the sludge is squeezed out to be converted into free water, which further improves the dewatering performance of the sludge, thereby reducing the moisture content of the filter cake.
超声波技术因其在城市污泥处理中具有无二次污染、分解速度快和设备简单等优点而备受关注。本文对城市污泥的超声-化学处理进行了研究。结果表明，超声波能破坏污泥絮体结构和细胞壁，释放细胞内有机物，加速水解过程；超声波能改善污泥的沉降和脱水性能；超声波对污泥可产生海绵效应，使水流更易从波面通过通道，从而使污泥颗粒团聚并增大粒径；超声波能促进凝聚；超声波还能提高剩余污泥的活性，提高厌氧消化过程的效率和最终沼气产量。超声-阳离子聚丙烯酰胺（CPAM）处理能在一定程度上削弱颗粒间的排斥力，使污泥絮体失稳。此外，絮凝剂CPAM的吸附和架桥作用进一步使污泥颗粒团聚，污泥中的水分被挤出转化为自由水，进一步提高了污泥的脱水性能，从而降低滤饼的含水率。
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