scholarly journals Feeding composition and sludge retention time both affect (co-)metabolic biotransformation of pharmaceutical compounds in activated sludge systems

2021 ◽  
Vol 9 (2) ◽  
pp. 105123
Author(s):  
Lorena Gonzalez-Gil ◽  
Eduardo Fernandez-Fontaina ◽  
Randolph R. Singh ◽  
Juan M. Lema ◽  
Marta Carballa ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Pharmaceutical Compounds ◽  
Sludge Retention Time ◽  
Activated Sludge Systems

Removal of selected endocrine disrupters in activated sludge systems: Effect of sludge retention time on their sorption and biodegradation

2010 ◽  
Vol 101 (7) ◽  
pp. 2090-2095 ◽  
Author(s):  
Athanasios S. Stasinakis ◽  
Constantinos I. Kordoutis ◽  
Vasiliki C. Tsiouma ◽  
Georgia Gatidou ◽  
Nikolaos S. Thomaidis
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Endocrine Disrupters ◽  
Sludge Retention Time ◽  
Activated Sludge Systems

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.

scholarly journals A Modified Activated Sludge Model No.3 (ASM3) for Membrane Bioreactor (MBR) with an Emphasis for Solids Hydrolysis

2018 ◽  
Vol 53 ◽  
pp. 04039
Author(s):  
Xinyue Jiang ◽  
Bin Xu
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Retention Time ◽  
Membrane Bioreactor ◽  
Activated Sludge Model ◽  
Modeling Approach ◽  
Sludge Retention Time ◽  
Subsequent Effect ◽  
Hydrolysis Of ◽  
Denitrification Process

The previously assumed “inert” organics measured by respirometric method has been reported to be hydrolysable under long sludge retention time (SRT) configuration such as membrane bioreactor(MBR). The sludge production under long SRT has also shown to be lower than the standard activated sludge model (ASM) prediction. The hydrolysis of “inert” organics can provide the extra carbon source for denitrification. The current modeling approach has not yet included this aspect. In this study, a modified ASM3 was developed to account for the hydrolysis of “inert” organics and subsequent effect on the denitrification process under long SRT.

Relevance of the sludge retention time (SRT) as design criteria for wastewater treatment plants for the removal of endocrine disruptors and pharmaceuticals from wastewater

2004 ◽  
Vol 50 (5) ◽  
pp. 149-156 ◽  
Author(s):  
N. Kreuzinger ◽  
M. Clara ◽  
B. Strenn ◽  
H. Kroiss
Keyword(s):  
Wastewater Treatment ◽  
Endocrine Disruptors ◽  
Removal Efficiency ◽  
Retention Time ◽  
Wastewater Treatment Plants ◽  
Pharmaceutically Active Compounds ◽  
Additional Information ◽  
Sludge Retention Time ◽  
Nitrification Process ◽  
Activated Sludge Systems

Wastewater treatment plants (WWTPs) represent a significant source for the input of micro pollutants as endocrine disruptors (EDs) or pharmaceutically active compounds (PhACs) into the aquatic environment. Treatment efficiency of WWTPs often is reported, taking into account only inflow and effluent concentrations without further specification of the WWTP investigated. In order to allow comparison and evaluation of the removal efficiency of different layouts and concepts in wastewater treatment, additional information like the sludge retention time (SRT) and sludge load (F/M ratio) are necessary. Presented results from different WWTPs show correlation of removal of EDs and PhACs to the SRT. Compared to WWTPs with high F/M ratio implementation of the nitrification process on WWTPs results in a significant increase of the removal efficiency for EDs and PhACs. This paper describes an approach to determine comparable removal rates for different activated sludge systems based on mass balance and SRT.

Mathematical Modeling of Aerobic Membrane Bioreactor (MBR) Using Hybrid Activated Sludge Model No. 3 (ASM3)

2010 ◽  
Vol 113-116 ◽  
pp. 1424-1428
Author(s):  
Yu Tian ◽  
Lin Chen ◽  
Xin Ying Su ◽  
Chu Qing Cao
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Recent Trend ◽  
Trial And Error ◽  
Municipal Wastewater Treatment ◽  
Sludge Retention Time ◽  
Microbial Products ◽  
Operating Strategies

Recent trend for membrane bioreactor (MBR) operation was to apply a low sludge retention time (SRT) to decrease the fouling propensity and simplify the overall maintenance. However, the correct control and operation of MBRs under low SRT conditions were not well-established. In this study, modeling of MBR system for municipal wastewater treatment was evaluated using hybrid Activated Sludge Models 3 (ASM3), which helped in determining the control and operating strategies. The experiment-based, manual trial-and-error approach used to calibrate the hybrid ASM3 was verified to be useful for MBR modeling at 30 d sludge retention time (SRT). Furthermore, the consistency relationships among carbon oxygen demanded (COD), soluble microbial products (SMP) and mixed liquor suspended solids (MLSS) were established in the process of modeling, implying that the accurate simulation of MLSS were the prerequisites for the COD and SMP prediction.

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