A HYPOTHESIS FOR THE CAUSE OF LOW F/M FILAMENT BULKING IN NUTRIENT REMOVAL ACTIVATED-SLUDGE SYSTEMS

被引:34
作者
CASEY, TG
WENTZEL, MC
LOEWENTHAL, RE
EKAMA, GA
MARAIS, GV
机构
[1] Water Research Group, Department of Civil Engineering, University of Cape Town, Rondebosch
关键词
ACTIVATED SLUDGE; NUTRIENT REMOVAL; BULKING; F/M FILAMENTS;
D O I
10.1016/0043-1354(92)90020-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Laboratory research has indicated that a possible cause of low F/M filament bulking in ND (nitrification-denitrification) and NDBEPR (nitrification-denitrification biological excess phosphorus removal) systems occurs as a result of competition for substrate between filamentous and floc-forming organisms which have different denitrification pathways. In ND and NDBEPR systems alternating anoxic-aerobic conditions prevail and continuous utilization of particulate slowly biodegradable COD (SBCOD) by floc-forming organisms in these systems leads to accumulation of the denitrification intermediates nitrite (NO2-) and nitric oxide (NO) under anoxic conditions. It is proposed that a cause for low F/M filament bulking is that the intermediate NO inhibits the utilization of SBCOD by floc-formers under subsequent aerobic conditions, with high concentrations of NO2- exacerbating this effect, thereby allowing filamentous organisms, which do not accumulate NO, to dominate. Some experimental evidence to support this proposal is presented.
引用
收藏
页码:867 / 869
页数:3
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