LUOLu,SHIZhou,XUShi-rong,et al.Effect of Lysozyme Pretreatment on Dewatering Performance of Excess Activated Sludge[J].China Water & Wastewater,2022,38(No.3):87-91.
Click Copy

Effect of Lysozyme Pretreatment on Dewatering Performance of Excess Activated Sludge

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: No.第3 Page: 87-91 Column: Date of publication: 2022-02-01
Author(s):
LUO　Lu1; 2;  SHI　Zhou1; 2;  XU　Shi-rong1; 2;  ZHOU　Shi-qing1; 2;  LI　Guang-chao1; 2;  ZHOU　Xian-min1; 2
（1. College of Civil Engineering， Hunan University， Changsha 410082， China； 2. Key Laboratory of Building Safety and Energy Efficiency ， Hunan University， Changsha 410082， China）
Keywords:
excess activated sludge;  lysozyme;  dewatering performance;  sludge structure
Abstract:
The lysozyme was used in the pretreatment of activated sludge, and the effect of lysozyme dosage on sludge dewatering performance was investigated. The moisture content of vacuum filtration sludge cake, sludge filtration resistance, sludge capillary sunction time (CST), Zeta potential and the protein & polysaccharides contents in sludge supernatant were analyzed. Moreover, the change of sludge flocs and granular structure were measured by normal microscope and scanning electron microscope. Based on the three?dimensional fluorescence spectrum, the sludge dewatering performance before and after lysozyme pretreatment was evaluated. The results showed that the appropriate lysozyme dosage could enhance the sludge dewatering performance. When the lysozyme dosage was 15%, the moisture content of vacuum filtration sludge cake decreased from 91.4% to 63.6%, the sludge filtration resistance decreased by 82%, CST decreased by 65%, and the Zeta potential increased from -14.8 mV to 2.7 mV. The results showed that the destruction of sludge structure by lysozyme was an important reason for improving sludge dewatering performance.
Last Update: 2022-02-01