文献类型：期刊文献

英文题名：A control strategy for promoting the stability of denitrifying granular sludge in upflow sludge blankets

作者：Wang, Feng[1];Jin, Xibiao[1];Yang, Shanshan[1];Liu, Yongdi[1];Chen, Xiurong[1]

机构：[1]E China Univ Sci & Technol, Res Inst Environm Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：35

期号：1

起止页码：52

外文期刊名：ENVIRONMENTAL TECHNOLOGY

收录：;EI(收录号：20203309045203);WOS:【SCI-EXPANDED(收录号:WOS:000328108700007)】；

基金：This research was supported by the National Key Technologies Research and Development Program of China (No. 2008BAE64B06).

语种：英文

外文关键词：granular sludge; denitrification; nitrate; USB; stability

摘要：The nitrate removal rate of denitrifying granular sludge in an upflow sludge blanket reactor is very high and reaches up to 3.6gNO(3)-NgVSS(-1)d(-1) at a nitrate loading rate (NLR) of 32.0gNO(3)-NL(-1)d(-1). However, the granular sludge exhibits flotation under high NLR conditions, where the granules become large in size (of approximately 3-5mm), light, and easily adhere to gas bubbles. In order to decrease the flotation potentiality of granular sludge, three measures were taken as follows: reducing the size of the granules, increasing the density of the granules, and weakening the adhesion effect of sludge to bubbles. While, these measures did not completely eliminate the granular sludge flotation. The way to solve sludge flotation namely instability was to slow down the biomass growth rate. The main factors to reduce denitrifying bacteria growth rate were verified as relatively low operating temperature, carbon source with comparatively slow degradation rate, and low NLR. Therefore, controlling denitrifying biomass growth rate via reducing temperature, replacing methanol with glucose as carbon source, and decreasing NLR was able to improve the stability of the granular sludge.