Nitrification Kinetics in Activated Sludge with Both Suspended and Attached Biomasses

1994 ◽  
Vol 29 (7) ◽  
pp. 181-184 ◽  
Author(s):  
P. Chudoba ◽  
M. Pannier
Keyword(s):  
Activated Sludge ◽  
Aeration Tank ◽  
Continuous Systems ◽  
Biomass Growth ◽  
Batch Tests ◽  
Activated Sludge System ◽  
Nitrification Kinetics ◽  
Kinetic Tests ◽  
Suspended Biomass ◽  
Kinetics Of

A series of nitrification kinetic tests was carried out with both suspended and fixed biomasses originated from a combined activated sludge system with a plastic support for biomass growth introduced into the aeration tank (Experimental combined unit - ECU). The results of these batch tests were compared with kinetics calculated from continuously run pilot plant. It was concluded that nitrification kinetics of both suspended and attached biomasses were similar and, consequently, it was assumed that the percentage of autotrophs is the same in both biomasses. The kinetics determined in both batch and continuous systems were comparable. Kinetic constants measured for suspended biomass of the ECU were higher than those reported by the literature, which was attributed to an overaeration of the ECU and an energetic mixing

Evaluation of ozonation and cryptic growth for biosolids management in wastewater treatment

1999 ◽  
Vol 39 (10-11) ◽  
pp. 155-158 ◽  
Author(s):  
E. Egemen ◽  
J. Corpening ◽  
J. Padilla ◽  
R. Brennan ◽  
N. Nirmalakhandan
Keyword(s):  
Activated Sludge ◽  
Continuous Flow ◽  
Growth Conditions ◽  
Aeration Tank ◽  
Biomass Growth ◽  
Waste Sludge ◽  
Process Configuration ◽  
Activated Sludge System ◽  
Expensive Problems ◽  
Cryptic Growth

The ultimate disposal of biosolids has been and continues to be one of the most expensive problems faced by wastewater utilities. The objective of this research is to develop a process configuration for reducing the waste sludge generation in an activated sludge plant by promoting cryptic growth conditions (i.e., biomass growth on intracellular products). For this purpose, excess biosolids from a continuous flow activated sludge system were solubilized using ozone as the cell lysis agent, and then returned to the aeration tank. It is hypothesized that growth under such cryptic conditions will result in low net microbial yields, and hence, minimal net solids wastage. The results of these preliminary studies indicate that the proposed process configuration has the potential to reduce the waste sludge production by 40% to 60%.

Nitrification kinetics of activated sludge-biofilm system: A mathematical model

2010 ◽  
Vol 101 (15) ◽  
pp. 5827-5835 ◽  
Author(s):  
Arun Kumar Thalla ◽  
Renu Bhargava ◽  
Pramod Kumar
Keyword(s):  
Mathematical Model ◽  
Activated Sludge ◽  
System A ◽  
Nitrification Kinetics ◽  
Kinetics Of

Kinetics of chrome-tannery effluent treatment by the activated-sludge system

1999 ◽  
Vol 35 (3-4) ◽  
pp. 255-265 ◽  
Author(s):  
Babu Ram ◽  
Pramod K Bajpai ◽  
Harjinder K Parwana
Keyword(s):  
Activated Sludge ◽  
Effluent Treatment ◽  
Tannery Effluent ◽  
Activated Sludge System ◽  
Kinetics Of

A Pilot-Plant Study to Salvage a Full-Scale Treatment Plant

1992 ◽  
Vol 25 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Y. H. Yu ◽  
K. S. L. Lo
Keyword(s):  
Activated Sludge ◽  
Pilot Plant ◽  
Settling Tank ◽  
Treatment Plant ◽  
Chemical Precipitation ◽  
Aeration Tank ◽  
Treatment Unit ◽  
Activated Sludge System ◽  
High Metal ◽  
Pilot Plant Study

Kwei-Shan Wastewater Treatment Plant is the second oldest treatment plant ever designed and operated in Taiwan, to treat the combined industrial wastewater collected from various kinds of factories located in Kwei-Shan Industrial Park. From the beginning the treatment plant has been suffering from influents containing a spectrum of various pollutants harmful to the activated-sludge system of the plant. Extreme pH measurements (1.4-12.0), jumpy organic contents (COD 104-6660 mg/l), high metal concentrations (Cu up to 19 mg/l, Zn up to 37 mg/l), and high grease concentrations (up to 470 mg/l) were unbelievably found in tne plant influents, while a traditional plain primary settling tank was the only shield to protect the aeration basin from damage. In a dilemma like this, a pilot-plant study was undertaken to save the efficiency of the existing biological treatment plant from those various fatal influent constituents. A flow equalization tank and a chemical treatment unit were first built to damp out pH and COD variations, Ca(OH)2 was added to remove the toxic metals as well as part of the grease. The effluent after the above treatment was then neutralized and sent to the downscaled activated sludge system containing one aeration tank and one settling tank. The results indicated that equalization and chemical precipitation by using the existing space of the roughing filter and the sedimentation tank could produce much safer influents to the activated sludge system.

Denitrification kinetics in an activated sludge system

1995 ◽  
Vol 32 (9-10) ◽  
pp. 323-330
Author(s):  
M. Roš
Keyword(s):  
Activated Sludge ◽  
Closed System ◽  
Open Systems ◽  
Aeration Tank ◽  
Activated Sludge System ◽  
Denitrification Kinetics ◽  
Closed Systems ◽  
Nitrate And Nitrite ◽  
Sludge Concentration

For all water bodies especially for sea, lakes, and ground waters it is very important that nutrient pollution is the least possible (minimal). From municipal and industrial waste waters where considerable amount of nutrients is expected it is possible to remove nutrients with biological treatment. The first step is usually aerobic activated sludge treatment and the second step is combined anaerobic-anoxic-aerobic step in different combinations. A very effective process for nitrogen removal is anoxic activated sludge system. It is very important that in the first aerobic step complete nitrification is achieved. In our laboratory denitrification kinetics was studied. The objective of this study was determination of denitrification velocity and attendance of different parallel phenomena such as nitrite, disappearance of nitrate and nitrite, sulphide formation, etc. Denitrification process was studied in two systems, in closed system (such as in closed reactors for denitrification) and in open systems (such as in open denitrification tanks). We found out that denitrification rate in closed systems was from about 8 to 52 mg/l.h and was dependent on activated sludge type, sludge concentration, and temperature of the system. In open system (such as in an anoxic aeration tank) the rate of denitrification was lower than in closed system; it was from 4 to 15 mg/l.h dependent on activated sludge type, sludge concentration, and temperature of the system. Experiments were carried out in the range of temperature from 20° to 30°C.

Performance of coarse pore filtration activated sludge system

2002 ◽  
Vol 46 (11-12) ◽  
pp. 71-76 ◽  
Author(s):  
M.R. Alavi Moghaddam ◽  
H. Satoh ◽  
T. Mino
Keyword(s):  
Activated Sludge ◽  
Pore Size ◽  
Small Scale ◽  
Aeration Tank ◽  
Activated Sludge Process ◽  
Trickling Filter ◽  
Conventional Activated Sludge ◽  
Activated Sludge System ◽  
Scale Reactor

A coarse pore filter can be applied inside the aeration tank to facilitate the separation of sludge from liquid instead of sedimentation. This filter has pores, which are irregular in shape, and the pore size is bigger than those of MF. The objectives of the study were to maintain as much as MLSS in the activated sludge process with coarse pore filter and to investigate the performance under high MLSS condition. Small-scale reactor results so far show good quality of effluent specially after starting the sludge bulking in the system in terms of SS, TOC, DOC and turbidity. The average carbon removal for 62 days operation of this system was about 94% (based on effluent DOC) and 87% (based on effluent TOC). The average sludge yield in this system is about 0.44 kg MLSS/kg TOC which is about 0.24 kg MLSS/kg BOD. This amount is less than those of conventional activated sludge and trickling filter.

Reliability analyses of activated sludge systems in attaining effluent standards

1993 ◽  
Vol 20 (2) ◽  
pp. 171-179
Author(s):  
Mukesh Sharma ◽  
W. B. Hall ◽  
E. A. McBean
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Point Method ◽  
Aeration Tank ◽  
Design Point ◽  
Effluent Standards ◽  
Activated Sludge System ◽  
First Order Second Moment ◽  
Key Words Reliability ◽  
Activated Sludge Processes

A design-point method, or advanced first-order second-moment technique, is used for reliability-based analyses of activated sludge processes in meeting specified effluent standards. Three non-normal random variables, namely flow, influent biochemical oxygen demand (BOD), and influent suspended solids (SS) concentrations, are utilized in evaluating the performance of the activated sludge system. Two types of failure to attain specified effluent standards are considered, namely BOD failure and SS failure. The reliability of activated sludge system is studied with respect to the volume of the aeration tank using design-point method. Key words: reliability analyses, BOD, activated sludge.

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