Effect of chromium(VI) on the biomass yield of activated sludge

被引：31
|
作者：
Yetis, Ü [1 ]
Demirer, GN [1 ]
Gökçay, CF [1 ]
机构：
[1] Middle E Tech Univ, Dept Environm Engn, TR-06531 Ankara, Turkey
来源：
ENZYME AND MICROBIAL TECHNOLOGY | 1999年 / 25卷 / 1-2期
关键词：
activated sludge; biomass yield; Cr(VI); maintenance; stimulation;
D O I：
10.1016/S0141-0229(99)00013-7
中图分类号：
Q81 [生物工程学（生物技术）]; Q93 [微生物学];
学科分类号：
071005 ; 0836 ; 090102 ; 100705 ;
摘要：
Effect of 1-25 mg/l of influent Cr(VI) concentrations on true biomass yield (Y-t) and decay coefficient (k(d)) of activated sludge units was investigated in this study. To this purpose, completely mixed, once-through laboratory scale activated sludge units with acclimated cultures were operated. After obtaining dilute-out curves for each Cr(VI) concentration, the values of Y-t and k(d) were determined. The results revealed that presence of Cr(VI) caused stimulatory effects on biomass yield and maintenance up to the Cr(VI) concentration of 25 mg/l. Lower Cr(VI) concentrations exerted higher stimulation of the system. Extended oxidation due to the presence of Cr(VI) and/or increased synthesis of cellular material due to the stimulatory effects of Cr(VI) were thought to be the mechanisms of the observed stimulation. (C) 1999 Elsevier Science Inc. All rights reserved.
引用
收藏
页码：48 / 54
页数：7
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