Assessing the impact of Solids Retention Time (SRT) on the secondary clarifier capacity using the State Point Analysis

2014 ◽  
Vol 19 (5) ◽  
pp. 1265-1270 ◽  
Author(s):  
Oleyiblo Oloche James ◽  
Jia-Shun Cao ◽  
Amos T. Kabo-Bah ◽  
Gan Wang
Keyword(s):  
Retention Time ◽  
The State ◽  
Point Analysis ◽  
State Point ◽  
Secondary Clarifier ◽  
Solids Retention Time ◽  
Solids Retention ◽  
The Impact

Nitrogen removal in activated sludge systems including denitrification in secondary clarifiers

1994 ◽  
Vol 30 (6) ◽  
pp. 101-111 ◽  
Author(s):  
H. Siegrist ◽  
W. Gujer
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Secondary Clarifier ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Activated Sludge Systems

Denitrification in the secondary clarifier can contribute substantially to the nitrogen removal of activated sludge systems. This is illustrated on two treatment plants with different secondary clarifier systems. A model to estimate denitrification capacity and to design activated sludge systems for nitrogen removal is developed and verified with data from two treatment plants. The model includes denitrification in the secondary clarifier, wastewater composition (soluble readily biodegradable COD, particulate degradable COD), oxygen input into the anoxic volume, temperature, and solids retention time (SRT). The influence of aerated grit chambers and primary sedimentation on denitrification is discussed.

Impact of solids retention time on dissolved organic nitrogen and its biodegradability in treated wastewater

2016 ◽  
Vol 92 ◽  
pp. 44-51 ◽  
Author(s):  
Halis Simsek ◽  
Murthy Kasi ◽  
Jae-Bom Ohm ◽  
Sudhir Murthy ◽  
Eakalak Khan
Keyword(s):  
Retention Time ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Treated Wastewater ◽  
Solids Retention Time ◽  
Solids Retention

scholarly journals Effect of solids retention time on Microthrix parvicella growth

Water SA ◽  
2007 ◽  
Vol 32 (3) ◽  
Author(s):  
C Noutsopoulos ◽  
D Mamais ◽  
A Andreadakis
Keyword(s):  
Retention Time ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Microthrix Parvicella

Fundamental Studies on Hydrogen Production in the Acid-Forming Phase and Its Bacteria in Anaerobic Treatment Processes – The Effects of Solids Retention Time

1993 ◽  
Vol 28 (7) ◽  
pp. 81-88 ◽  
Author(s):  
Michimasa Nakamura ◽  
Hiroshi Kanbe ◽  
Jun'ichiro Matsumoto
Keyword(s):  
Retention Time ◽  
Volatile Fatty Acids ◽  
Anaerobic Bacteria ◽  
Anaerobic Treatment ◽  
Gas Production ◽  
Hydrogen Gas ◽  
Gas Content ◽  
Treatment Processes ◽  
Solids Retention Time ◽  
Solids Retention

Effects of solids retention time (SRT) on hydrogen gas production, glucose degradation and anaerobic bacteria in anaerobic treatment processes were investigated with use of 11,700 mg/l glucose solution as a substrate. Five series of experiments were conducted at 36 ± 1°C. Volatile fatty acids were produced in the order: acetic, n-butyric, propionic and n-valeric with concentration of effluent. Counts of general anaerobic bacteria and acid-forming bacteria in each reactor increased with increasing SRT, and counts of genus Clostridium and sulphate reducing bacteria in the reactor decreased with increasing SRT of the reactor. Gas production rates and gas composition were investigated to obtain information on energy production. Solids retention time increased from 2 to 10 h, hydrogen gas content decreased from 12 to 9%. The kinetic constants such as the microbial decay coefficient (Kd), the maintenance coefficient (m) and the growth yield for microorganisms (YG) were 4.04,41.7 and 0.097 day−1, respectively.

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