Removal of nitrogen and phosphorus from swine wastewater by the activated sludge units with the intermittent aeration process

1991 ◽  
Vol 25 (11) ◽  
pp. 1377-1388 ◽  
Author(s):  
Takashi Osada ◽  
Kiyonori Haga ◽  
Yasuo Harada
Keyword(s):  
Activated Sludge ◽  
Swine Wastewater ◽  
Intermittent Aeration ◽  
Nitrogen And Phosphorus ◽  
Aeration Process

The Selector Effect on Filamentous Bulking in Long Sludge Age Activated Sludge Systems

1991 ◽  
Vol 23 (4-6) ◽  
pp. 867-877 ◽  
Author(s):  
D. M. D. Gabb ◽  
D. A. Still ◽  
G. A. Ekama ◽  
D. Jenkins ◽  
G. v. R. Marais
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Sufficient Conditions ◽  
Extensive Investigation ◽  
Intermittent Aeration ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Aeration System ◽  
Microthrix Parvicella ◽  
Activated Sludge Systems

A survey of long sludge age activated sludge plants in South Africa showed that bulking was widespread in nitrogen and nitrogen and phosphorus removal plants with the dominant causative filamentous organisms being the low F/M types 0092, 0675, 0041, Microthrix parvicella, 0914 and 1851. The literature suggests that in aerobic systems proliferation of the low F/M filaments can be controlled by aerobic selector reactors. From an extensive investigation into the selector reactors, and the effect these stimulate, it was concluded that in long sludge age systems, irrespective of whether or not a selector effect is present in the sludge, (1) under completely aerobic conditions low F/M filaments do not proliferate, (2) sequential or alternating anoxic-aerobic periods like intermittent aeration are necessary, though not sufficient, conditions for the proliferation of low F/M filaments, and (3) an aerobic selector installed on an intermittent aeration system did not control low F/M filament proliferation.

Development of 2-reactor intermittent-aeration activated sludge process for simultaneous removal of nitrogen and phosphorus

1996 ◽  
Vol 34 (1-2) ◽  
pp. 111-118 ◽  
Author(s):  
Kousei Sasaki ◽  
Yasuji Yamamoto ◽  
Kazushi Tsumura ◽  
Sachiko Ouchi ◽  
Yutaka Mori
Keyword(s):  
Activated Sludge ◽  
Phosphorus Uptake ◽  
Phosphorus Release ◽  
Activated Sludge Process ◽  
Intermittent Aeration ◽  
Anaerobic Conditions ◽  
Nitrogen And Phosphorus ◽  
In Series ◽  
Plant Experiment ◽  
One Year

We have developed a new intermittently aerated anaerobic-aerobic activated sludge process. This process employs 2 reactors connected in series, and is capable of controlling the duration of aerobic, anoxic and anaerobic conditions in both reactors by utilizing the ORP bending point, which corresponds to the termination of denitrification. One cycle of aeration and agitation takes approximately 120 minutes. In the 1st reactor, nitrification and phosphorus uptake occur in the aeration period, followed by denitrification and phosphorus release in the agitation period. In the 2nd reactor, nitrification and phosphorus uptake are conducted during aeration, and denitrification and weak phosphorus uptake during agitation. A one-year pilot plant experiment using sewage (22 m3/day) showed stable and high removal ratios of 98% for BOD, 92% for T-N, and 85% for T-P under conditions of HRT 20 hours and water temperature 9∼33°C.

Activated Sludge Model No. 1 calibration for piggery wastewater treatment using respirometry

2004 ◽  
Vol 49 (5-6) ◽  
pp. 389-396 ◽  
Author(s):  
H. Boursier ◽  
F. Beline ◽  
E. Paul
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Intermittent Aeration ◽  
Hydrolysis Constant ◽  
Piggery Wastewater ◽  
Activated Sludge Model ◽  
A Value ◽  
Organic Fractions ◽  
Aeration Process ◽  
Kinetics Of

To optimise the intermittent aeration process for piggery wastewater, the Activated Sludge Model No. 1 needs to be calibrated and adapted to this specific effluent. By combining aerobic and anoxic respirometric tests, biodegradation kinetics of organic fractions in piggery wastewater could be studied. Modeling of the respirometric curves proved that the simplified hydrolysis model was sufficient for piggery wastewater treatment simulation. The hydrolysis constant (KH) and heterotrophic sludge yield (YH) were determined at temperature and pH in the ranges 10-40°C and 7-9, respectively. The constants were slightly influenced by the temperature but not significantly affected by the pH, with average values of 3 d-1 for KH, and 0.60 for YH. The anoxic respirometric tests revealed that the experimental ASM1 anoxic correction factor (ηg) was higher than one. This could be explained by the fact that the anoxic and the aerobic heterotrophic sludge yields were probably different. By fixing a value of 0.8 for ηg, the anoxic sludge yield (YHD) could be calculated at 0.53. A modified version of ASM1 for substrate biodegradation in piggery wastewater intermittent aeration process was proposed, including the separation between the anoxic and the aerobic sludge yields and a simplified hydrolysis kinetic.

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