文献类型：期刊文献

英文题名：Characteristics of denitrifying granular sludge grown on nitrite medium in an upflow sludge blanket (USB) reactor

作者：Jin, Xibiao[1];Wang, Feng[1];Liu, Guohong[1];Liu, Yongdi[1]

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

年份：2012

卷号：65

期号：8

起止页码：1420

外文期刊名：WATER SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20121814975191);WOS:【SCI-EXPANDED(收录号:WOS:000302957600011)】；

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：denitrification; granular sludge; nitrite; USB

摘要：While inoculating pre-acclimatized floccular sludge, nitrite-denitrifying granular sludge was obtained after approximately 40 days of cultivation in a 10 L upflow sludge blanket (USB) reactor. The nitrite removal efficiency was approximately 95% when the nitrite concentration was 50 mg L-1 at an influent flow rate of 20 L h(-1). The nitrite granular sludge had several notable features including good settleability (110 m h(-1)), high ash content (79%), and high density (1.248 g cm(-3)). The mixed liquor suspended solids (MLSS) of the sludge bed remained at 130.04 g L-1, at a hydraulic upflow velocity of 2 m h(-1). These interesting characteristics were attributed to a high effluent pH (9.7) caused by the release of alkalinity during the nitrite denitrification process. The surfaces of the granules were dominated by cocci bacteria with a diameter of approximately 3 mu m, which could be classified as Nitrosomonas-like species based on our analysis of 16 S rDNA sequences.