RCEES OpenIR  > 水污染控制实验室
Oxygen transfer dynamics and activated sludge floc structure under different sludge retention times at low dissolved oxygen concentrations
Fan, Haitao; Liu, Xiuhong; Wang, Hao; Han, Yunping; Qi, Lu; Wang, Hongchen
2017-02-01
Source PublicationCHEMOSPHERE
Volume169Issue:0Pages:586-595
AbstractIn 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.
Department水污染控制实验室
KeywordEps Srt Floc Structure Settling Performance Low Do
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/39574
Collection水污染控制实验室
Recommended Citation
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,Qi, Lu,&Wang, Hongchen.(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.
Files in This Item: Download All
File Name/Size DocType Version Access License
Oxygen transfer dyna(2545KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Fan, Haitao]'s Articles
[Liu, Xiuhong]'s Articles
[Wang, Hao]'s Articles
Baidu academic
Similar articles in Baidu academic
[Fan, Haitao]'s Articles
[Liu, Xiuhong]'s Articles
[Wang, Hao]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Fan, Haitao]'s Articles
[Liu, Xiuhong]'s Articles
[Wang, Hao]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Oxygen transfer dynamics and activated sludge floc structure under different sludge retention times at low dissolved oxygen concentrations.pdf
Format: Adobe PDF
This file does not support browsing at this time
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.