Improving flow distribution in influent channels using computational fluid dynamics

2016 ◽  
Vol 74 (8) ◽  
pp. 1855-1866 ◽  
Author(s):  
No-Suk Park ◽  
Sukmin Yoon ◽  
Woochang Jeong ◽  
Seungjae Lee
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Short Circuit ◽  
Treatment Plant ◽  
Flow Distribution ◽  
Inflow Rate ◽  
Two Phase ◽  
Typical Structure

Although the flow distribution in an influent channel where the inflow is split into each treatment process in a wastewater treatment plant greatly affects the efficiency of the process, and a weir is the typical structure for the flow distribution, to the authors' knowledge, there is a paucity of research on the flow distribution in an open channel with a weir. In this study, the influent channel of a real-scale wastewater treatment plant was used, installing a suppressed rectangular weir that has a horizontal crest to cross the full channel width. The flow distribution in the influent channel was analyzed using a validated computational fluid dynamics model to investigate (1) the comparison of single-phase and two-phase simulation, (2) the improved procedure of the prototype channel, and (3) the effect of the inflow rate on flow distribution. The results show that two-phase simulation is more reliable due to the description of the free-surface fluctuations. It should first be considered for improving flow distribution to prevent a short-circuit flow, and the difference in the kinetic energy with the inflow rate makes flow distribution trends different. The authors believe that this case study is helpful for improving flow distribution in an influent channel.

The Use of Computational Fluid Dynamics for Improving the Design and Operation of Water and Wastewater Treatment Plants

1999 ◽  
Vol 40 (4-5) ◽  
pp. 81-89 ◽  
Author(s):  
C. J. Brouckaert ◽  
C. A. Buckley
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Potable Water ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Outer Wall ◽  
Water And Wastewater Treatment ◽  
Secondary Clarifier

Computational Fluid Dynamics (CFD) studies of a secondary clarifier at Durban's Northern Wastewater Treatment Works, and of a clarifier at the potable water treatment plant at Umzinto, a small town near Durban, have been undertaken with a view to improving their load capacities. In both cases the units are located in relatively old treatment plants, which face continually increasing loads due to population growth. Increasing the capacity of existing equipment, rather than installing new equipment, constitutes an efficient use of development capital. Although the two clarifiers have considerable design differences, the CFD studies indicated remarkably similar circulating flows, which concentrate up-flow near the outer wall of the clarifier in the region of the clarified water overflow weirs. Baffles were designed to disrupt the circulation so as to distribute up-flow over a wider area, thereby reducing the maximum vertical velocities. In the case of the wastewater secondary clarifier, the modification has been implemented, and evaluated in comparative tests involving an otherwise identical unmodified clarifier. In the case of the potable water clarifier, the modification has still to be implemented.

Model structure identification for wastewater treatment simulation based on computational fluid dynamics

2002 ◽  
Vol 45 (4-5) ◽  
pp. 325-334 ◽  
Author(s):  
J. Alex ◽  
G. Kolisch ◽  
K. Krause
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Dynamic Simulation ◽  
Cfd Simulation ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Structure Identification ◽  
Suitable Model ◽  
Model Structure

The objective of this presented project is to use the results of an CFD simulation to automatically, systematically and reliably generate an appropriate model structure for simulation of the biological processes using CSTR activated sludge compartments. Models and dynamic simulation have become important tools for research but also increasingly for the design and optimisation of wastewater treatment plants. Besides the biological models several cases are reported about the application of computational fluid dynamics (CFD) to wastewater treatment plants. One aim of the presented method to derive model structures from CFD results is to exclude the influence of empirical structure selection to the result of dynamic simulations studies of WWTPs. The second application of the approach developed is the analysis of badly performing treatment plants where the suspicion arises that bad flow behaviour such as short cut flows is part of the problem. The method suggested requires as the first step the calculation of fluid dynamics of the biological treatment step at different loading situations by use of 3-dimensional CFD simulation. The result of this information is used to generate a suitable model structure for conventional dynamic simulation of the treatment plant by use of a number of CSTR modules with a pattern of exchange flows between the tanks automatically. The method is explained in detail and the application to the WWTP Wuppertal Buchenhofen is presented.

scholarly journals ANN-Based Short-Term Wastewater Flow Prediction for Better WWTP Control

2010 ◽  
Vol 4 (2) ◽  
pp. 159-162
Author(s):  
Leslaw Plonka ◽  
◽  
Korneliusz Miksch ◽  
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Wastewater Treatment ◽  
Control Systems ◽  
Neural Network Model ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Inflow Rate ◽  
Short Term ◽  
Flow Prediction

This paper presents an approach to predict the amount of the wastewater which enters wastewater treatment plant, using artificial neural network. The method presented can be used to give short-term predictions of wastewater inflow-rate. The described neural network model uses a very tiny set of data commonly collected by WWTP control systems.

Dairy Wastewater Treatment Engineering Examples

2013 ◽  
Vol 295-298 ◽  
pp. 1333-1336
Author(s):  
You Qing Gao ◽  
Hong Cui
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Process ◽  
Treatment Plant ◽  
Dairy Wastewater ◽  
Aerobic Treatment ◽  
Municipal Wastewater Treatment ◽  
Two Phase ◽  
Treated Water

The wastewater treatment works of one of Yili dairy plants are analyzed in detail in this paper. Two-phase anaerobic and composite aerobic treatment process for wastewater is used in this project. The treated water can reach the first level B discharge standard of “Discharge standard of pollutants for municipal wastewater treatment plant” (GB18918-2002).

Choice of Optimal Configurations for Two-Phase Biological Reactors on the Basis of Hydraulic Model Studies of a Wastewater Treatment Plant in Gdańsk

1991 ◽  
Vol 24 (7) ◽  
pp. 73-80 ◽  
Author(s):  
M. Maciejewski
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Colorimetric Method ◽  
Treatment Plant ◽  
Point Of View ◽  
Two Phase ◽  
Model Studies ◽  
Stream Lines ◽  
Optimal Configurations ◽  
The City

The paper presents procedure, results and conclusions drawn from laboratory studies of nitrification and denitrification chambers of two-phase biological reactors with recirculation system, for a designed wastewater treatment plant of 270 000 m3/day capacity, for the city of Gdańsk. On the 1:17 physical model, observations of stream lines and measurements of the velocity field in some characteristic regions have been performed. The measurements have been carried out for 14 different configurations of the reactor operation, depending on the aerator turbines, mammoth rotors and prototypical mixers with horizontal axle and with guide-ring. Based on these studies, and having introduced some structural innovations aimed at improving flow uniformity around aerators and rotors, a variant optimal from the point-of-view of hydraulic properties and energy consumption has been proposed for realization. Moreover, using results of some other investigations performed on a structure in technical scale, conclusions concerning the following questions have been presented: I/ the importance of uniform velocity distribution in the reactor for final effeot of operation of the wastewater treatment plant, II/ relationships between velocity, discharge and hydraulic efficiency of the wastewater treatment plant chambers, III/ the influence of geometry of chambers and of recirculation on the efficiency of the purification process. The paper includes drawings, figures and short descriptions of the following experimental techniques used in the investigations: the method of varying temperature field, the colorimetric method, the conductometric method and the method using a current micrometer. A video film on the study is available.

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