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.
超声/厌氧消化处理剩余污泥参数优化及机理研究
- Title:
- Parameter Optimization and Mechanism of Ultrasonic and Anaerobic Digestion for the Treatment of Excess Sludge
- Keywords:
- ultrasounic; anaerobic digestion; excess sludge; parameter optimization; mechanism; particle size
- 摘要:
- 针对污水厂剩余污泥量大和低C/N污水脱氮碳源不足问题，将剩余污泥破壁作为碳源回用，具有较强的可行性和现实意义。为此，研究了超声联合厌氧消化工艺破解剩余污泥的适宜运行参数和溶出物质的效果，并探究了污泥破解机理。通过对SCOD、蛋白质、多糖、VFAs的浓度变化趋势进行分析，确定了超声联合厌氧消化工艺的最佳组合参数：声能密度为1.5 W/mL，处理时间为30 min，厌氧消化处理时间为7 d。对剩余污泥进行超声预处理发现，随着声能密度的增强，污泥液相中各物质浓度增大，但30 min以后各物质浓度的增长趋势逐渐变缓。厌氧消化能够帮助污泥溶胞，并且可以提升VFAs浓度。通过污泥粒径的变化可知，超声可以破坏污泥的絮体结构，进而加快水解过程，缩短厌氧消化时间。
- 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.
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