Oxygen transfer dynamics and activated sludge floc structure under different sludge retention times at low dissolved oxygen concentrations
文献类型：期刊论文
| 作者 | Fan, Haitao; Liu, Xiuhong; Wang, Hao; Han, Yunping; Wang, Hongchen; Qi, Lu |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2017-02-01 |
| 卷号 | 169期号:0页码:586-595 |
| 关键词 | Eps Srt Floc Structure Settling Performance Low Do |
| 英文摘要 | In activated sludge systems, the aeration process consumes the most energy. The energy cost can be dramatically reduced by decreasing the operating dissolved oxygen (DO) concentration. However, low DO may lead to incomplete nitrification and poor settling performance of activated sludge flocs (ASFs). This study investigates oxygen transfer dynamics and settling performances of activated sludge under different sludge retention times (SRTs) and DO conditions using microelectrodes and microscopic techniques. Our experimental results showed that with longer SRTs, treatment capacity and settling performances of activated sludge improved due to smaller floc size and less extracellular polymeric substances (EPS). Long-term low DO conditions produced larger flocs and more EPS per unit sludge, which produced a more extensive anoxic area and led to low oxygen diffusion performance in flocs. Long SRTs mitigated the adverse effects of low DO. According to the microelectrode analysis and fractal dimension determination, smaller floc size and less EPS in the long SRT system led to high oxygen diffusion property and more compact floc structure that caused a drop in the sludge volume index (SVI). In summary, our results suggested that long SRTs of activated sludge can improve the operating performance under low DO conditions. (C) 2016 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/39574]  |
| 专题 | 生态环境研究中心_水污染控制实验室 |
| 推荐引用方式 GB/T 7714 | Fan, Haitao,Liu, Xiuhong,Wang, Hao,et al. Oxygen transfer dynamics and activated sludge floc structure under different sludge retention times at low dissolved oxygen concentrations[J]. CHEMOSPHERE,2017,169(0):586-595. |
| APA | Fan, Haitao,Liu, Xiuhong,Wang, Hao,Han, Yunping,Wang, Hongchen,&Qi, Lu.(2017).Oxygen transfer dynamics and activated sludge floc structure under different sludge retention times at low dissolved oxygen concentrations.CHEMOSPHERE,169(0),586-595. |
| MLA | Fan, Haitao,et al."Oxygen transfer dynamics and activated sludge floc structure under different sludge retention times at low dissolved oxygen concentrations".CHEMOSPHERE 169.0(2017):586-595. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。