Upgrading Conventional Activated Sludge System Using Bio-media: A Case Study of Zenin Wastewater Treatment Plant, Egypt

This work provides a case study on how activated sludge modelling and computational fluid dynamics (CFD) can help to optimize the energy consumption of a treatment plant that is already equipped with an advanced control based on online nutrient measurements. Currently, aeration basins on wastewater treatment plant Antwerp-South are operated sequentially while flow direction and point of inflow and outflow vary as a function of time. Activated sludge modelling shows that switching from the existing alternating flow based control to a simultaneous parallel feeding of all aeration tanks saves 1.3% energy. CFD calculations also illustrate that the water velocity is still sufficient if some impellers in the aeration basins are shutdown. The simulations of the Activated Sludge Model No. 2d indicate that the coupling of the aeration control with the impeller control, and automatically switching off some impellers when the aeration is inactive, can save 2.2 to 3.3% of energy without affecting the nutrient removal efficiency. On the other hand, all impellers are needed when the aeration is active to distribute the oxygen.

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Modeling of Activated Sludge with ASM1 Model, Case Study on Wastewater Treatment Plant of South of Isfahan

Current World Environment ◽

10.12944/cwe.10.special-issue1.14 ◽

2015 ◽

Vol 10 (Special-Issue1) ◽

pp. 96-105 ◽

Cited By ~ 1

Author(s):

Farzaneh Mohamadi ◽

Somaye Rahimi ◽

Bijan Bina ◽

Mohamad Amin

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Municipal Wastewater ◽

Formal Model ◽

Treatment Plant ◽

Yield Coefficient ◽

Model Case ◽

Kinetic Coefficients

ASM1 model is one of the most widely used models of activated sludge process which is the interest of researchers. This model was first proposed in 1987 by the IAWQ group and it is the first formal model of activated sludge. In this research, to evaluate the consistent of model's result with the reality, the data of wastewater treatment plant of south of Isfahan was used. This treatment plant covers a population about 800000 people, and the activated sludge method is used for treating municipal wastewater. The components of ASM1 mode such as fast biodegradable substrate parameters (Ss) and slow biodegradable (Xs) and the concentration of total COD, total nitrogen, suspended solids, nitrate nitrogen and Kjeldahl nitrogen were measured within 68 days and were included in the model. For modeling, the STOAT software was used where the ASM1 model was implemented. To calibrate the model, four cases from bio-kinetic coefficients of ASM1 model was obtained based on the results and the model was corrected in the default values. These coefficients include maximum specific growth rate (µm), decay coefficient (Kd), yield coefficient(Y), and saturation constant (Ks). The model results were consistent with the reality‎.

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Changes in hormone and stress-inducing activities of municipal wastewater in a conventional activated sludge wastewater treatment plant

Water Research ◽

10.1016/j.watres.2014.08.035 ◽

2014 ◽

Vol 66 ◽

pp. 265-272 ◽

Cited By ~ 5

Author(s):

Pola Wojnarowicz ◽

Wenbo Yang ◽

Hongde Zhou ◽

Wayne J. Parker ◽

Caren C. Helbing

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Municipal Wastewater ◽

Treatment Plant ◽

Conventional Activated Sludge

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Nitrification Processes in Tehran Wastewater Treatment Plant

ISRN Mechanical Engineering ◽

10.5402/2011/545794 ◽

2011 ◽

Vol 2011 ◽

pp. 1-9

Author(s):

S. A. Sadrnejad

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Treatment Plant ◽

Primary Treatment ◽

High Rate ◽

Trickling Filter ◽

Combined System ◽

Conventional Activated Sludge ◽

Balance Analysis

A wastewater treatment plant is designed to daily treat 450000 m3 of wastewater collected from the city of Tehran. The wastewater treatment plant is located at the south of Shahr-Ray in southern Tehran with the area of 110 hectares. The treatment plant effluent will be transferred to Varamin agricultural lands to be used for the irrigation of crops. A conventional activated sludge for carbon removal and a high-rate trickling filter for nitrification of ammonia to nitrate are designed and constructed. The treatment plant consists of inlet pumping station, primary treatment, primary sedimentation tanks, selector and aeration tanks, trickling filter, and sludge treatment units. A mass balance analysis method which is a new approach for optimum design is used to achieve cost saving for the construction of south Tehran wastewater treatment plant. The comparison between combined system of activated sludge with trickling filter and an activated sludge alone shows that the combined system is 20% less costly and more efficient for the treatment of Tehran wastewater, the system has low volume demand, maximum biogas yeild, and low process control and is less variable to pH and chemical effects and highly energy-efficient.

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