scholarly journals How well-mixed is well mixed? Hydrodynamic-biokinetic model integration in an aerated tank of a full-scale water resource recovery facility

2017 ◽  
Vol 76 (8) ◽  
pp. 1950-1965 ◽  
Author(s):  
Usman Rehman ◽  
Wim Audenaert ◽  
Youri Amerlinck ◽  
Thomas Maere ◽  
Marina Arnaldos ◽  
...  
Keyword(s):  
Water Resource ◽  
Weather Conditions ◽  
Resource Recovery ◽  
Full Scale ◽  
Local Concentration ◽  
Biokinetic Model ◽  
Liquid Phases ◽  
In Series ◽  
The Impact ◽  
Process Level

Current water resource recovery facility (WRRF) models only consider local concentration variations caused by inadequate mixing to a very limited extent, which often leads to a need for (rigorous) calibration. The main objective of this study is to visualize local impacts of mixing by developing an integrated hydrodynamic-biokinetic model for an aeration compartment of a full-scale WRRF. Such a model is able to predict local variations in concentrations and thus allows judging their importance at a process level. In order to achieve this, full-scale hydrodynamics have been simulated using computational fluid dynamics (CFD) through a detailed description of the gas and liquid phases and validated experimentally. In a second step, full ASM1 biokinetic model was integrated with the CFD model to account for the impact of mixing at the process level. The integrated model was subsequently used to evaluate effects of changing influent and aeration flows on process performance. Regions of poor mixing resulting in non-uniform substrate distributions were observed even in areas commonly assumed to be well-mixed. The concept of concentration distribution plots was introduced to quantify and clearly present spatial variations in local process concentrations. Moreover, the results of the CFD-biokinetic model were concisely compared with a conventional tanks-in-series (TIS) approach. It was found that TIS model needs calibration and a single parameter set does not suffice to describe the system under both dry and wet weather conditions. Finally, it was concluded that local mixing conditions have significant consequences in terms of optimal sensor location, control system design and process evaluation.

scholarly journals From wastewater treatment to water resource recovery: Environmental and economic impacts of full-scale implementation

2021 ◽  
pp. 117554
Author(s):  
Maria Faragò ◽  
Anders Damgaard ◽  
Jeanette Agertved Madsen ◽  
Jacob Kragh Andersen ◽  
Dines Thornberg ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Water Resource ◽  
Economic Impacts ◽  
Resource Recovery ◽  
Full Scale

scholarly journals Integrated model predictive control of water resource recovery facilities and sewer systems in a smart grid: example of full-scale implementation in Kolding

2020 ◽  
Vol 81 (8) ◽  
pp. 1766-1777 ◽  
Author(s):  
P. A. Stentoft ◽  
L. Vezzaro ◽  
P. S. Mikkelsen ◽  
M. Grum ◽  
T. Munk-Nielsen ◽  
...  
Keyword(s):  
Smart Grid ◽  
Model Predictive Control ◽  
Power Consumption ◽  
Water Resource ◽  
Predictive Control ◽  
Storage Capacity ◽  
Resource Recovery ◽  
Integrated Model ◽  
Full Scale ◽  
Sewer System

Abstract An integrated model predictive control (MPC) strategy to control the power consumption and the effluent quality of a water resource recovery facility (WRRF) by utilizing the storage capacity from the sewer system was implemented and put into operation for a 7-day trial period. This price-based MPC reacted to electricity prices and forecasted pollutant loads 24 hours ahead. The large storage capacity available in the sewer system directly upstream from the plant was used to control the incoming loads and, indirectly, the power consumption of the WRRF during dry weather operations. The MPC balances electricity costs and treatment quality based on linear dynamical models and predictions of storage capacity and effluent concentrations. This article first shows the modelling results involved in the design of this MPC. Secondly, results from full-scale MPC operation of the WRRF are shown. The monetary savings of the MPC strategy for the specific plant were quantified around approximately 200 DKK per day when fully exploiting the allowed storage capacity. The developed MPC strategy provides a new option for linking WRRFs to smart grid electricity systems.

Modelling energy costs for different operational strategies of a large water resource recovery facility

2017 ◽  
Vol 75 (9) ◽  
pp. 2139-2148 ◽  
Author(s):  
P. Póvoa ◽  
A. Oehmen ◽  
P. Inocêncio ◽  
J. S. Matos ◽  
A. Frazão
Keyword(s):  
Water Resource ◽  
Dynamic Modelling ◽  
Resource Recovery ◽  
Arithmetic Mean ◽  
Full Scale ◽  
Energy Costs ◽  
Energy Prices ◽  
Operational Strategies ◽  
Energy Pricing

The main objective of this paper is to demonstrate the importance of applying dynamic modelling and real energy prices on a full scale water resource recovery facility (WRRF) for the evaluation of control strategies in terms of energy costs with aeration. The Activated Sludge Model No. 1 (ASM1) was coupled with real energy pricing and a power consumption model and applied as a dynamic simulation case study. The model calibration is based on the STOWA protocol. The case study investigates the importance of providing real energy pricing comparing (i) real energy pricing, (ii) weighted arithmetic mean energy pricing and (iii) arithmetic mean energy pricing. The operational strategies evaluated were (i) old versus new air diffusers, (ii) different DO set-points and (iii) implementation of a carbon removal controller based on nitrate sensor readings. The application in a full scale WRRF of the ASM1 model coupled with real energy costs was successful. Dynamic modelling with real energy pricing instead of constant energy pricing enables the wastewater utility to optimize energy consumption according to the real energy price structure. Specific energy cost allows the identification of time periods with potential for linking WRRF with the electric grid to optimize the treatment costs, satisfying operational goals.

scholarly journals Diagnosis and optimization of WWTPs using the PWM library: full-scale experiences

2016 ◽  
Vol 75 (3) ◽  
pp. 518-529 ◽  
Author(s):  
T. Fernández-Arévalo ◽  
I. Lizarralde ◽  
M. Maiza ◽  
S. Beltrán ◽  
P. Grau ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Mathematical Models ◽  
Water Resource ◽  
Wastewater Treatment Plants ◽  
Resource Recovery ◽  
Full Scale ◽  
Complete Model ◽  
Model Library ◽  
Advanced Technologies ◽  
Wide Range

Given the shift in perception of wastewater treatment plants as water resource recovery facilities, conventional mathematical models need to be updated. The resource recovery perspective should be applied to new processes, technologies and plant layouts. The number and level of models proposed to date give an overview of the complexity of the new plant configurations and provides a wide range of possibilities and process combinations in order to construct plant layouts. This diversity makes the development of standard, modular and flexible tools and model libraries that allow the incorporation of new processes and components in a straightforward way a necessity. In this regard, the plant-wide modelling (PWM) library is a complete model library that includes conventional and advanced technologies and that allows economic and energetic analyses to be carried out in a holistic way. This paper shows the fundamentals of this PWM library that is built upon the above-mentioned premises and the application of the PWM library in three different full-scale case studies.

Temporal variability of parasites, bacterial indicators, and wastewater micropollutants in a water resource recovery facility under various weather conditions

2019 ◽  
Vol 148 ◽  
pp. 446-458 ◽  
Author(s):  
Samira Tolouei ◽  
Jean-Baptiste Burnet ◽  
Laurène Autixier ◽  
Milad Taghipour ◽  
Jane Bonsteel ◽  
...  
Keyword(s):  
Water Resource ◽  
Temporal Variability ◽  
Weather Conditions ◽  
Resource Recovery ◽  
Bacterial Indicators

scholarly journals Dynamic grit chamber modelling: dealing with particle settling velocity distributions

2020 ◽  
Vol 81 (8) ◽  
pp. 1682-1699 ◽  
Author(s):  
Queralt Plana ◽  
Paul Lessard ◽  
Peter A. Vanrolleghem
Keyword(s):  
Dynamic Model ◽  
Water Resource ◽  
Settling Velocity ◽  
Resource Recovery ◽  
Mass Balances ◽  
Particle Settling ◽  
Inorganic Particles ◽  
Design And Optimization ◽  
Modelling Studies ◽  
The Impact

Abstract Grit chambers are meant to reduce the impact of inorganic particles on equipment and processes downstream. Despite their important role, characterization and modelling studies of these process units are scarce, leading to a lack of knowledge and suboptimal operation. Thus, this study presents the first dynamic model, based on mass balances and particle settling velocity distributions, for use in a water resource recovery facility (WRRF) simulator for design and optimization of grit removal units.

Prospects of spring wheat cultivation in the conditions of arid Volga region

2020 ◽  
pp. 28-33
Author(s):  
Valery Genadievich Popov ◽  
Andrey Vladimirovich Panfilov ◽  
Yuriy Vyacheslavovich Bondarenko ◽  
Konstantin Mikhailovich Doronin ◽  
Evgeny Nikolaevih Martynov ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Soil Layer ◽  
Weather Conditions ◽  
Volga Region ◽  
Mineral Fertilizers ◽  
Climate Conditions ◽  
Wheat Cultivation ◽  
Forest Belts ◽  
Clear Differentiation ◽  
The Impact

The article analyzes the experience of the impact of the system of forest belts and mineral fertilizers on the yield of spring wheat, including on irrigated lands. Vegetation irrigation is designed to maintain the humidity of the active soil layer from germination to maturation at the lower level of the optimum-70-75%, and in the phases of tubulation-earing - flowering - 75-80% NV. However, due to the large differences in zones and microzones of soil and climate conditions and due to the weather conditions of individual years, wheat irrigation regimes require a clear differentiation. In the Volga region in the dry autumn rainfalls give the norm of 800-1000 m3/ha, and in saline soils – 1000-1300 and 3-4 vegetation irrigation at tillering, phases of booting, earing and grain formation the norm 600-650 m3/ha. the impact of the system of forest belts, mineral fertilizers on the yield of spring wheat is closely tied to the formation of microclimate at different distances from forest edges.

River-Basin Planning for Control of Nitrate Pollution

1982 ◽  
Vol 14 (4-5) ◽  
pp. 245-252 ◽  
Author(s):  
C S Sinnott ◽  
D G Jamieson
Keyword(s):  
Time Series ◽  
Time Series Analysis ◽  
River Basin ◽  
Water Resource ◽  
Potable Water ◽  
Potential Problem ◽  
Nitrate Pollution ◽  
Optimal Mix ◽  
Regional Basis ◽  
The Impact

The combination of increasing nitrate concentrations in the River Thames and the recent EEC Directive on the acceptable level in potable water is posing a potential problem. In assessing the impact of nitrates on water-resource systems, extensive use has been made of time-series analysis and simulation. These techniques are being used to define the optimal mix of alternatives for overcoming the problem on a regional basis.

Wastewater Lagoons in a Cold Climate

1987 ◽  
Vol 19 (12) ◽  
pp. 47-53 ◽  
Author(s):  
J. A. Oleszkiewicz ◽  
A. B. Sparling
Keyword(s):  
Control Mechanism ◽  
Maximum Load ◽  
Domestic Sewage ◽  
Full Scale ◽  
Cold Climate ◽  
Odor Control ◽  
Intermittent Rivers ◽  
In Series ◽  
Break Up ◽  
Lagoon Systems

Severe climate, intermittent rivers and availability of land make facultative lagoon systems the method of choice in treating primarily domestic sewage from smaller municipalities. The lagoons are designed on a recommended maximum load of 55 kgBOD5/ha d to first cell, while the second cell provides storage. The discharge is twice annually and the occurrence of the spring ice break-up odor period is one of the primary criteria limiting this load. Based on full scale performance data, it is demonstrated that, from the standpoint of odor nuisance, the load to the first cell should be kept equal to or less than 35 kg/ha d. Full scale studies of an overloaded lagoon system show the futility of under-ice aeration for odor control. Mechanism of natural odor control during ice break up is elucidated. Upgrading of the overloaded systems or lagoons receiving significant industrial contribution is best achieved by construction of a 3–5 m deep aerated lagoon preceding the two or more facultative cells in series.

Dynamic simulation of a low loaded trickling filter for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 163-168 ◽  
Author(s):  
K. Seggelke ◽  
F. Obenaus ◽  
K.-H. Rosenwinkel
Keyword(s):  
Dynamic Simulation ◽  
Weather Conditions ◽  
Full Scale ◽  
Trickling Filter ◽  
Examination Period ◽  
Trickling Filters ◽  
Biofilm Model ◽  
Measuring Campaign

For this report, an existing biofilm model was examined in regard to its suitability for the simulation of full scale trickling filter for nitrification. The system was calibrated using the results ascertained in a measuring campaign under dry weather conditions. The verification was done using the results of a second examination period which included spells of stormwater input. It was possible for all periods to satisfactorily illustrate the degradation performance of the simulated trickling filters in regard to dynamics and quantity.

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