LIUYong-jian,LIUYu-lei,XUXue-xin,et al.Parameter Optimization and Mechanism of Ultrasonic and Anaerobic Digestion for the Treatment of Excess Sludge[J].China Water & Wastewater,2022,38(5):84-90.
Parameter Optimization and Mechanism of Ultrasonic and Anaerobic Digestion for the Treatment of Excess Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第5期
Page:
84-90
Column:
Date of publication:
2022-03-01
- Keywords:
- ultrasounic; anaerobic digestion; excess sludge; parameter optimization; mechanism; particle size
- Abstract:
- Aiming at the problem of large amount of excess sludge and insufficient carbon source for denitrification of low C/N wastewater, it is feasible and practical to reuse the disintegrated excess sludge as carbon source. The optimal operating parameters and the release of dissolved substances in the process of ultrasonic combined with anaerobic digestion for excess sludge disintegration were investigated, and the mechanism of sludge disintegration was explored. By analyzing the profile of SCOD, protein, polysaccharide and VFAs concentrations, the optimal parameters of ultrasonic combined with anaerobic digestion were determined as follows: acoustic energy density of 1.5 W/mL, treatment time of 30 min and anaerobic digestion treatment time of 7 days. Ultrasonic pretreatment of excess sludge showed that the concentration of each substance in liquid phase increased with the increase of acoustic energy density.However,the increasing trend of each substance concentration gradually slowed down.Anaerobic digestion was beneficial to sludge lysis and increased VFAs concentrations. Variations in sludge particle size indicated that ultrasonic destroyed the floc structure of sludge, so as to accelerate the hydrolysis process and shorten the anaerobic digestion time.
Last Update:
2022-03-01