Effects of SRT and DO on nutrient removal in a combined AS-biofilm process

被引:32
作者
Chuang, SH [1 ]
Ouyang, CF
Yuang, HC
You, SJ
机构
[1] Natl Cent Univ, Grad Inst Environm Engn, Chungli 320, Taiwan
[2] Municipal Govt Taipei, Sewerage Engn Dept, Publ Work Bur, Taipei, Taiwan
关键词
nutrient removal; phosphorus uptake; nitrification; denitrification; polyhydroxyalkanoates; (PHAs); biofilm;
D O I
10.2166/wst.1997.0426
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study examines the effects of sludge retention time (SRT) and dissolved oxygen (DO) on GOD, nitrogen and phosphorus removal in a combined activated sludge biofilm process. Various SRT (5, 10, 12 and 15 days) and dissolved oxygen (0.1, 0.5, 1.0 and 2.0 mg/l in aerobic stage) conditions are performed during the hybrid process. Experimental results indicate that SRT significantly affects the behavior of nitrogen and phosphorus removal, although the variation of COD removal is only slight in different SRT experiments. The SRT should be controlled for longer than 10 days to achieve efficient nitrogen removal. However, a SRT less than 12 days is deemed necessary to complete the phosphorus removal. The process displays similar characteristics when dissolved oxygen is operated between 1.0 to 2.0 mg/l in the aerobic stage. Moreover, analyzing polyhydroxyalkanoates (PHAs) reveals that phosphorus release and uptake are closely related to PHAs accumulation and utilization, respectively, during anaerobic, anoxic and aerobic stages of the process. The ratio of phosphorus uptake and PHAs utilized, r(P)/(PHAs), denotes a dissimilar trend during anoxic and aerobic stages. The sludge has a high efficiency in utilizing PHAs for phosphorus uptake in anoxic stage when it is under lower COD-SS loading conditions. The value of r(P/PHAs) ranges from approximately 0.1 to 1.0 mg P/mg PHAs. In addition, experimental results also demonstrate that anoxic phosphorus uptake can improve phosphorus removal in biological nutrient removal processes. (C) 1997 IAWQ. Published by Elsevier Science Ltd.
引用
收藏
页码:19 / 27
页数:9
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