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

被引：35

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

来源：

WATER RESEARCH | 1992年 / 26卷 / 06期

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

页码：867 / 869

页数：3

共 11 条

[1] NITRIC-OXIDE FORMED BY NITRITE REDUCTASE OF PARACOCCUS-DENITRIFICANS IS SUFFICIENTLY STABLE TO INHIBIT CYTOCHROME-OXIDASE ACTIVITY AND IS REDUCED BY ITS REDUCTASE UNDER AEROBIC CONDITIONS [J].