Kinetics of phenol degradation by activated sludge: Value of measurements in a batch reactor

The current paper studies the viability of using a Batch reactor, by five types of Al-Fe pillared clay that prepared from five regions in Iraq for phenol degradation in synthetic wastewater. The operation condition study through variables in (pH, pressure, temperature, pillared load, phenol load). The findings have illustrated that phenol degradation could be increase via incrementing temperature, pressure, pillared load and degrease in phenol load. Phenol good degradation proportion which was 97 %, has been achieved at optimum proportion (pH= 3.9, temperature = 150 °C, pressure = 3.5 MPa, in addition to phenol concentration = 500 mg/l). The two models power-law and Langmuir−Hinshelwood have been used to study the catalytic kinetics of the phenol degradation. From results shown the activation energy for every response equivalent to (37114.014 j/mol) for Anbar (37795, 48783.9, 36628, 40785 j/mol) for Erbil, Mosul, Baghdad and Basra respectively. It was proved that the reaction in this study is under kinetics control.

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Growth kinetics of an indigenous mixed microbial consortium during phenol degradation in a batch reactor

Bioresource Technology ◽

10.1016/j.biortech.2006.11.045 ◽

2008 ◽

Vol 99 (1) ◽

pp. 205-209 ◽

Cited By ~ 112

Author(s):

Pichiah Saravanan ◽

K. Pakshirajan ◽

Prabirkumar Saha

Keyword(s):

Growth Kinetics ◽

Microbial Consortium ◽

Batch Reactor ◽

Phenol Degradation ◽

Kinetics Of

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Studying the Phenol Degradation in Synthetic Wastewater by Catalytic Wet Air Oxidation Process in Batch Reactor

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.20.27399 ◽

2018 ◽

Vol 7 (4.20) ◽

pp. 594

Author(s):

Ghayda Yaseen AL Kindi ◽

Faris Hammoodi AL Ani ◽

. .

Keyword(s):

Batch Reactor ◽

Phenol Degradation ◽

Pillared Clay ◽

Synthetic Wastewater ◽

Air Oxidation ◽

Wet Air Oxidation ◽

Operation Condition ◽

Optimum Proportion ◽

Catalytic Kinetics ◽

Kinetics Of

The current paper studies the viability of using a Batch reactor, by five types of Al-Fe pillared clay that prepared from five regions in Iraq for phenol degradation in synthetic wastewater. The operation condition study through variables in (pH, pressure, temperature, pillared load, phenol load). The findings have illustrated that phenol degradation could be increase via incrementing temperature, pressure, pillared load and degrease in phenol load. Phenol good degradation proportion which was 97 %, has been achieved at optimum proportion (pH= 3.9, temperature = 150 °C, pressure = 3.5 MPa, in addition to phenol concentration = 500 mg/l). The two models power-law and Langmuir−Hinshelwood have been used to study the catalytic kinetics of the phenol degradation. From results shown the activation energy for every response equivalent to (37114.014 j/mol) for Anbar (37795, 48783.9, 36628, 40785 j/mol) for Erbil, Mosul, Baghdad and Basra respectively. It was proved that the reaction in this study is under kinetics control.

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A Technique to Determine Unsteady-State Inhibition Kinetics in the Activated Sludge Process

Water Science & Technology ◽

10.2166/wst.1989.0261 ◽

1989 ◽

Vol 21 (6-7) ◽

pp. 593-602 ◽

Cited By ~ 3

Author(s):

Andrew T. Watkin ◽

W. Wesley Eckenfelder

Keyword(s):

Activated Sludge ◽

Kinetic Parameters ◽

Curve Fitting ◽

Glucose Utilization ◽

Batch Reactor ◽

Synthetic Data ◽

Utilization Rate ◽

Fitting Algorithm ◽

Test Reactor ◽

Two Parameter

A technique for rapidly determining Monod and inhibition kinetic parameters in activated sludge is evaluated. The method studied is known as the fed-batch reactor technique and requires approximately three hours to complete. The technique allows for a gradual build-up of substrate in the test reactor by introducing the substrate at a feed rate greater than the maximum substrate utilization rate. Both inhibitory and non-inhibitory substrate responses are modeled using a nonlinear numerical curve-fitting technique. The responses of both glucose and 2,4-dichlorophenol (DCP) are studied using activated sludges with various acclimation histories. Statistically different inhibition constants, KI, for DCP inhibition of glucose utilization were found for the various sludges studied. The curve-fitting algorithm was verified in its ability to accurately retrieve two kinetic parameters from synthetic data generated by superimposing normally distributed random error onto the two parameter numerical solution generated by the algorithm.

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Enrichment and characterization of an anaerobic methyl ethyl ketoxime degrading culture from an anoxic/anaerobic/aerobic activated sludge sequencing batch reactor

Water Science & Technology ◽

10.2166/wst.1998.0590 ◽

1998 ◽

Vol 37 (4-5) ◽

pp. 95-98 ◽

Cited By ~ 1

Author(s):

Nancy G. Love ◽

Mary E. Rust ◽

Kathy C. Terlesky

Keyword(s):

Energy Source ◽

Activated Sludge ◽

Electron Acceptor ◽

Sequencing Batch Reactor ◽

Enrichment Culture ◽

Batch Reactor ◽

Nitrification Inhibitor ◽

Time Frame ◽

Methyl Ethyl

An anaerobic enrichment culture was developed from an anoxic/anaerobic/aerobic activated sludge sequencing batch reactor using methyl ethyl ketoxime (MEKO), a potent nitrification inhibitor, as the sole carbon and energy source in the absence of molecular oxygen and nitrate. The enrichment culture was gradually fed decreasing amounts of biogenic organic compounds and increasing concentrations of MEKO over 23 days until the cultures metabolized the oxime as the sole carbon source; the cultures were maintained for an additional 41 days on MEKO alone. Turbidity stabilized at approximately 100 mg/l total suspended solids. Growth on selective media plates confirmed that the microorganisms were utilizing the MEKO as the sole carbon and energy source. The time frame required for growth indicated that the kinetics for MEKO degradation are slow. A batch test indicated that dissolved organic carbon decreased at a rate comparable to MEKO consumption, while sulfate was not consumed. The nature of the electron acceptor in anaerobic MEKO metabolism is unclear, but it is hypothesized that the MEKO is hydrolyzed intracellularly to form methyl ethyl ketone and hydroxylamine which serve as electron donor and electron acceptor, respectively.

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On-line measurements of settling characteristics in activated sludge

Water Science & Technology ◽

10.2166/wst.1997.0144 ◽

1997 ◽

Vol 36 (4) ◽

pp. 307-312

Author(s):

Michael R. Rasmussen ◽

Torben Larsen

Keyword(s):

Activated Sludge ◽

Settling Velocity ◽

Continuous Measurement ◽

Batch Reactor ◽

Volume Index ◽

Sludge Volume Index ◽

Dynamic Variations ◽

On Line ◽

Settling Column ◽

Settling Characteristics

An on-line settling column for measuring the dynamic variations of settling velocity of activated sludge has been developed. The settling column is automatic and self-cleansing insuring continuous and reliable measurements. The settling column was tested on sludge from a batch reactor where sucrose was added as an impulse to activated sludge. The continuous measurement of settling velocity revealed a highly dynamic response after the sucrose was added. The results were verified with simultaneous measurement of the initial settling rate. A 200 hour experiment showed variations in settling velocity, which was not apparent in the DSVI (Diluted Sludge Volume Index).

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Excess nitrogen accumulation in activated sludge in sequencing batch reactor with a single-stage oxic process

Water Science & Technology ◽

10.2166/wst.2009.003 ◽

2009 ◽

Vol 59 (3) ◽

pp. 573-582 ◽

Cited By ~ 3

Author(s):

Xiao-ming Li ◽

Dong-bo Wang ◽

Qi Yang ◽

Wei Zheng ◽

Jian-bin Cao ◽

...

Keyword(s):

Activated Sludge ◽

Nitrogen Removal ◽

Sequencing Batch Reactor ◽

Ph Value ◽

Batch Reactor ◽

Nitrogen Loss ◽

Single Stage ◽

Synthetic Wastewater ◽

Nitrogen Accumulation ◽

Excess Nitrogen

It was occasionally found that a significant nitrogen loss in solution under neutral pH value in a sequencing batch reactor with a single-stage oxic process using synthetic wastewater, and then further studies were to verify the phenomenon of nitrogen loss and to investigate the pathway of nitrogen removal. The result showed that good performance of nitrogen removal was obtained in system. 0–7.28 mg L−1 ammonia, 0.08–0.38 mg L−1 nitrite and 0.94–2.12 mg L−1 nitrate were determined in effluent, respectively, when 29.85–35.65 mg L−1 ammonia was feeding as the sole nitrogen source in influent. Furthermore, a substantial nitrogen loss in solution (95% of nitrogen influent) coupled with a little gaseous nitrogen increase in off-gas (7% of nitrogen influent) was determined during a typical aerobic phase. In addition, about 322 mg nitrogen accumulation (84% of nitrogen influent) was detected in activated sludge. Based on nitrogen mass balance calculation, the unaccounted nitrogen fraction and the ratio of nitrogen accumulation in sludge/nitrogen loss in solution were 14.6 mg (3.7% of nitrogen influent) and 0.89, respectively. The facts indicated that the essential pathway of nitrogen loss in solution in this study was excess nitrogen accumulation in activated sludge.

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