Simulation of a nitrification control concept considering influent ammonium load

2002 ◽  
Vol 45 (4-5) ◽  
pp. 413-420 ◽  
Author(s):  
K. Krause ◽  
K. Böcker ◽  
J. Londong
Keyword(s):  
Wastewater Treatment ◽  
Feedback Control ◽  
Dynamic Simulation ◽  
Feedforward Control ◽  
Treatment Plant ◽  
Grab Sample ◽  
Simulation Based ◽  
Control Concept ◽  
Control Configuration ◽  
Nitrogen Elimination

Buchenhofen wastewater treatment plant of Wupperverband (650,000 p.e.) is currently being expanded for targeted nitrogen elimination. In view of the limited space available for extension, an optimized control concept is to be used in order to minimize the number of additional tanks required. This concept was investigated by dynamic simulation based on Activated Sludge Model No. 1. The investigations included a pure feedback control configuration and a configuration combining feedback und feedforward control, considering the influent ammonium load, for aeration. The results show that combined feedforward/feedback control has significant advantages over pure feedback control. In particular, this configuration allows a reduction in the effluent NH4-N peaks, which is especially important because of the low NH4-N limit of 5 mg NH4-N/L in a grab sample.

Evaluation of Control Strategies in Activated Sludge Process for Biological Wastewater Treatment

2016 ◽  
Vol 11 (4) ◽  
pp. 279-289 ◽  
Author(s):  
B. Vivekanandan ◽  
A. Seshagiri Rao
Keyword(s):  
Feedback Control ◽  
Activated Sludge ◽  
Dynamic Simulation ◽  
Control Strategies ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Operating Costs ◽  
Activated Sludge Process ◽  
Feed Forward ◽  
Control Configuration

Abstract In this paper, benchmark simulation model no.1 (BSM1) of an activated sludge process is used to evaluate various control strategies. Control configurations such as feedback control and feed-forward plus feedback (FF-FB) control are applied and compared with respect to effluent discharge requirements under specified constraints and operating costs. Feed-forward control is incorporated in the PI control configuration for preventing the influent loading disturbance affecting the process. No case studies of BSM1 model have been reported in the literature for the Indian wastewater. In this work, the dynamic simulation of an activated sludge process is performed using the data collected from the sewage treatment plant, located in India. The influent load data are collected during the dry weather period. The influent fractionation is carried out using the activated sludge model no.1 (ASM1). The results of the dynamic simulation indicate that FF-FB control of the activated sludge process is more effective than feedback control in meeting the constraints, especially effluent ammonia concentration which is considered as very important. From the comparison of performance evaluation criteria, it is observed that FF-FB control has achieved almost the same operating costs as with feedback control.

Modeling of a large-scale wastewater treatment plant for efficient operation

2004 ◽  
Vol 50 (7) ◽  
pp. 123-130 ◽  
Author(s):  
C.F. Gokcay ◽  
G. Sin
Keyword(s):  
Wastewater Treatment ◽  
Dynamic Simulation ◽  
Large Scale ◽  
Treatment Plant ◽  
Quality Standards ◽  
Western World ◽  
Efficient Operation ◽  
Effluent Quality ◽  
Conventional Activated Sludge ◽  
Physical Chemical

Environmental legislations in the Western world impose stringent effluent quality standards for ultimate protection of the environment. This is also observed in Turkey. The current paper presents efforts made to simulate an existing 0.77 million m3/day conventional activated sludge plant located at Ankara, AWTP. The ASM1 model was used for simulation in this study. The model contains numerous stoichiometric and kinetic parameters, some of which need to be determined on case by case bases. The easily degradable COD (SS) was determined by two methods, physical-chemical and respirometric methods, namely. The latter method was deemed unreliable and rejected in the further study. Dynamic simulation with SSSP program predicted effluent COD and MLSS values successfully while overestimating OUR. A complete fit could only be obtained by introducing a dimensionless correction factor (ηO2 = 0.58) to the oxygen term in ASM1.

scholarly journals Full-scale wastewater treatment plant simulation for real-time optimization

2017 ◽  
Vol 12 (4) ◽  
pp. 848-856 ◽  
Author(s):  
Z. Gazsó ◽  
F. Házi ◽  
I. Kenyeres ◽  
L. Váci
Keyword(s):  
Wastewater Treatment ◽  
Real Time ◽  
Dynamic Simulation ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Model Parameters ◽  
Detailed Model ◽  
Operation Optimization ◽  
Time Operation ◽  
Real Time Operation

Abstract A dynamic simulation model has been developed and validated for the 1.4 million p.e. capacity Budapest Central Wastewater Treatment Plant to support intensification, process development and risk assessment. By the integration of both the biological and physico-chemical processes the technological design of separated units becomes possible as well as the exploration of the connections within the system. The calibration of the model parameters for an operating treatment plant is the key requirement for the proper application of dynamic simulation tool to optimize operational and maintenance conditions and specify the potential development areas. We have done a one-year period of validation which included sensitivity analysis and the simulation of time intervals in the same way as in the calibration process. At the same time we investigated the suitability of the simulation system for real-time operation optimization. As conclusion we ascertained that due to the computational power necessity of a properly detailed model, it is not applicable for real-time operation optimization, nevertheless it is suitable for the detection of the system reactions for long-term changes of the influent load. This means that a properly functioning model is applicable for indicating the development directions.

Comparison of denitrification-nitrification and step-feed activated sludge processes with dynamic simulation

2012 ◽  
Vol 7 (3) ◽  
Author(s):  
K. Sahlstedt ◽  
H. Haimi ◽  
J. Yli-Kuivila
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Dynamic Simulation ◽  
Dynamic Process ◽  
Wastewater Treatment Plant ◽  
Process Simulation ◽  
Treatment Process ◽  
Treatment Plant ◽  
Dynamic Process Simulation ◽  
Activated Sludge Processes

In conjunction with choosing the treatment process for the new wastewater treatment plant of Espoo, Finland (400,000 P.E.), Denitrification-Nitrification (DN) and Step-Feed activated sludge processes were compared in terms of required basin volume and consumption of aeration air and methanol. The comparison was made using dynamic process simulation. The advantages of the step-feed process reported in literature – smaller volume required to treat an equal load or ability to treat a higher load in an equal volume – were questioned. In terms of consumables, the two processes were found practically equal. This is, to the best of our knowledge, the first comparison of these process configurations with dynamic simulation.

Upgrading of a two-stage treatment plant for nitrogen elimination

1994 ◽  
Vol 29 (12) ◽  
pp. 283-289
Author(s):  
O. Burica ◽  
R. Vodopivec ◽  
M. Stražar
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Low Cost ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Treatment Facility ◽  
Two Stage ◽  
Effluent Quality ◽  
Nitrogen Elimination ◽  
Anaerobic Pretreatment

The paper describes the upgrading of an existing conventional two-stage municipal wastewater treatment plant for 200,000 PE to meet the EEC and Slovenian high effluent quality demands for nitrogen. The incoming wastewater is highly loaded with industrial waste and specifically with effluent from anaerobic pretreatment of piggery sludge. The low-cost concept of extensive wastewater treatment is based on integrating appropriate technologies into an existing treatment facility, preserving as much of the technical infrastructure as possible. The proposed concept uses a predenitrification system for the elimination of nitrogen.

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.

The first two years of full scale operation of the two-stage Main Wastewater Treatment Plant of Vienna

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
G. Wandl ◽  
H. Schaar ◽  
M. Papp ◽  
K. Svardal
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Evaluation Studies ◽  
Treatment Plant ◽  
Full Scale ◽  
Two Stage ◽  
Effluent Recirculation ◽  
Nitrogen Elimination ◽  
Year 2000

The Main Wastewater Treatment Plant of Vienna had to be extended to guarantee sufficient nitrogen removal. After intensive evaluation studies a two-stage activated sludge system was chosen for the plant-extension. Due to the very small specific reactor tank volume of two-stage treatment plants in comparison with low loaded single-stage plants internal cycles had to be applied to ensure sufficient nitrogen removal. Starting in the year 2000 the plant extension was finished by the beginning of 2005 and the extended plant went into operation in spring. The Austrian effluent standards had to be fulfilled by December 2005. This paper presents a description of the plant layout and gives an overview of the operating results of the first two years of full scale operation. Mass balances were used to evaluate the pathways of nitrogen removal. The results confirmed the expected flexibility of the chosen concept; nitrogen elimination did not decrease although the effluent recirculation that has been implemented to ensure sufficient nitrogen removal efficiency especially during winter had been reduced markedly due to energy reasons. The treatment efficiency that was observed at pilot plant investigations was clearly exceeded.

scholarly journals Optimization of Wastewater Treatment Plant Design using Process Dynamic Simulation: A Case Study from Kurdistan, Iraq

2019 ◽  
Vol 7 (1) ◽  
pp. 59
Author(s):  
Hayder M. Issa
Keyword(s):  
Wastewater Treatment ◽  
Dynamic Simulation ◽  
Wastewater Treatment Plant ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Simulation Software ◽  
Plant Design ◽  
Trickling Biofilter ◽  
Wwtp Design

Satisfactory effluent characteristics are indispensable to evaluate the performance of any wastewater treatment plant (WWTP) design. Dynamic simulation software has a great role in pursuing this objective, in which an efficient and cost-effective design is constantly performed. In this study, a dynamic simulator sewage treatment operation analysis over time (STOAT) has been used under certain influent conditions to optimize design possibilities for modifying an existing primary WWTP College of Engineering Wastewater Treatment Plant (COEWWTP) at Erbil, Kurdistan, Iraq. The optimization was established on the basis of total suspended solids (TSS) and biochemical oxygen demand (BOD) characteristics in the effluent. Two alternative design schemes were proposed; trickling biofilter and aeration basin. In the dynamic simulation for the investigated design schemes, the predicted effluent profile showed that each of the existing and trickling biofilter processes has failed to correspond to the valid effluent limitation, whereas predicted results of the aeration basin exhibited an effluent profile that meets TSS and BOD allowable limits. Different simulation models have been implemented by STOAT to simulate treatment processes in studied design approaches: ASAL 1 model; BOD model; BOD semi-dynamic model; and SSED 1 model. This study offers an additional understanding of WWTP design and facilitates the application of dynamic simulators as tools for wastewater treatment development in Kurdistan.

Sign in / Sign up

Export Citation Format

Share Document