Main Pathways in Primary Sludge Disintegration by Sonication and Enhancement of Sonication  

作　　者：王琦 汤曼琳 田晴 李方 杨波 

机构地区：[1]College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

出　　处：《Journal of Donghua University(English Edition)》2017年第1期21-26,共6页东华大学学报（英文版）

基　　金：National Natural Science Foundation of China(No.51478099);Scientific Research Foundation for Returned Overseas Chinese Scholars of China(No.SEM-11W11329)

摘　　要：The main pathways of primary sludge(PS)ultrasonic disintegration were analyzed at the sonication frequency of 20 kH z and the thermal effect on PS disintegration was investigated.By adding Na HCO3as a scavenger to entrap the free hydroxyl radicals,cavitation contributed to 82.91%of the total sonication effect.The power consumed by temperature rising accounted for more than40%of ultrasound power input at the power density of 0.215 W/m L and the sonication time of 10 min.With the thermal insulation of polyfoam coating during sonication,a 18.37%of soluble chemical oxygen demand(SCOD)increment was observed.With the process of pre-heating the PS before sonication,64.15%of SCOD increment was achieved.Compared with the particle size of 13.77μm for the sonicated PS,the sludge mean particle size decreased to 12.83 and11.98μm by applying polyfoam coating and pre-heating the PS to enhance the cavitation and thermal effect.It suggested that if thermal energy consumption was relieved during the sonication process of PS,more energy could be used to disintegrate the sludge.The main pathways of primary sludge （PS） ultrasonic disintegration were analyzed at the soulcation frequency of 20 kHz and the thermal effect on PS disintegration was investigated. By adding NaHCO3 as a scavenger to entrap the free hydroxyl radicals, cavitation contributed to 82.91% of the total sonication effect. The power consumed by temperature rising accounted for more than 40% of nitrasound power input at the power density of0.212 W/mL and the soulcation time of 10 min. With the thermal insulation of polyfoam coating during sonication, a 18. 37 % of soluble chemical oxygen demand （SCOD） increment was observed. With the process of pre-heatlng the PS before sonication, 64.15% of SCOD increment was achieved. Compared with the particle size of 13.77 pm for the sonicated PS, the sludge mean particle size decreased to 12.83 and 11.98 μm by applying polyfoam coating and pre-heating the PS toenhance the cavitation and thermal effect. It suggested that if thermal energy consumption was relieved during the sonication process of PS, more energy could be used to disintegrate the sludge.

关 键 词：primary sludge(PS) ULTRASONIC temperature effect sludge disintegration sludge deagglomeration 

分 类 号：X705[环境科学与工程—环境工程]