Excess cell mass as an internal carbon source for biological denitrification

被引：33
作者：
Biradar, Prashant M. [1 ]
Roy, S. B. [2 ]
D'Souza, S. F. [3 ]
Pandit, A. B. [1 ]
机构：
[1] Univ Bombay, Inst Chem Technol, Dept Chem Engn, Bombay 400019, Maharashtra, India
[2] Bhabha Atom Res Ctr, Uranium Extract Div, Bombay 400085, Maharashtra, India
[3] Bhabha Atom Res Ctr, Nucl Agr & Biotechnol Div, Bombay 400085, Maharashtra, India
来源：
BIORESOURCE TECHNOLOGY | 2010年 / 101卷 / 06期
关键词：
Activated sludge disruption; Hydrodynamic cavitation; Soluble chemical oxygen demand; Biological denitrification; NITRATE REMOVAL; WASTE-WATER; SLUDGE; DISRUPTION;
D O I：
10.1016/j.biortech.2009.10.049
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Aim of the present work was to examine whether the SCOD (soluble chemical oxygen demand) released after the physical disruption of excess activated sludge can be used as an alternative carbon source for biological denitrification. In the first stage of research, we investigated the potential use of energy efficient hydrodynamic cavitation (HC) technique for the disruption of activated sludge. In a comparative study between ultrasonic cavitation (UC) and HC, it was observed that UC needs five times more energy than that of HC to release the same amount of SCOD. In the second stage of the experimental study, SCOD was successfully used as an alternative carbon source (alternative to sodium acetate) for biological denitrification. The critical weight ratio (SCOD/NO3-N) of seven ensured 100% removal of nitrate. Nitrate removal kinetics indicated that denitrification with SCOD as a carbon source gives higher specific denitrification rate (by approximate to 200%) as compared to conventional carbon source (sodium acetate). (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1787 / 1791
页数：5
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