期刊
ULTRASONICS SONOCHEMISTRY
卷 73, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2021.105527
关键词
Low-intensity ultrasound; Partial nitrification; Sludge bioactivity; Extracellular polymeric substances properties
资金
- National Natural Science Foundation of China [51868025]
- Natural Science Foundation of Jiangxi Province [20202ACBL204017]
The study demonstrates that low-intensity ultrasound treatment enhances nitrite accumulation performance and the activity of ammonia-oxidizing bacteria, while inhibiting nitrite-oxidizing bacteria activity. Ultrasound treatment increases EPS contents, particularly loosely bound polysaccharides, and induces an increase in carbonyl, hydroxyl, and amine functional groups.
Ultrasound technology, which is environment-friendly and economical, has emerged as a novel strategy that can be used to enhance the partial nitrification process. However, its effect on this process remains unclear. Therefore, in this study, partial nitrification sludge was subjected to low-intensity (0.15 W/mL) ultrasound treatment for 10 min, and the effect of ultrasonic treatment on the partial nitrification process was evaluated based on changes in reactor performance, sludge characteristics, and the properties of extracellular polymeric substances (EPS). The results obtained showed that the ultrasonic treatment enhanced nitrite accumulation performance as well as the activity of ammonia-oxidizing bacteria from 3.3 to 16.6 mg O2/g VSS,?while inhibiting the activity of nitrite-oxidizing bacteria. Further analysis showed that owing to the ultrasonic treatment, there was an increase in EPS contents. Particularly, there was a significant increase in loosely bound polysaccharide (PS) contents, indicating the occurrence of intracellular PS anabolics as well as PS secretion. Additionally, ultrasonic treatment induced a significant increase in carbonyl, hydroxyl, and amine functional group contents, and EPS analysis results revealed that it had a positive effect on mass transfer efficiency; thus, it enhanced the partial nitrification process. Overall, this study describes the effect of intermittent low-intensity ultrasound on the partial nitrification process as well as the associated enhancement mechanism.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据