scholarly journals Probabilistic modelling and evaluation of wastewater treatment plant upgrades in a water quality based evaluation context

2010 ◽  
Vol 12 (4) ◽  
pp. 380-395 ◽  
Author(s):  
Lorenzo Benedetti ◽  
Webbey De Keyser ◽  
Ingmar Nopens ◽  
Peter A. Vanrolleghem
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Dynamic Modelling ◽  
Effluent Quality ◽  
Wwtp Effluent ◽  
Regulatory Standards ◽  
The Eu

Process choice and dimensioning of wastewater treatment plants (WWTPs) is difficult while ensuring regulatory standards are met and cost-efficiency is maintained. This step only accounts for a small fraction of the upfront costs, but can lead to substantial savings. This paper illustrates the results of a systematic methodology to evaluate system upgrade options by means of dynamic modelling. In contrast to conventional practice, the presented approach allows the most appropriate trade-off between cost of measures and effluent quality to be chosen and the reliability of a process layout to be assessed by means of uncertainty analysis. In a hypothetical case study, thirteen WWTP upgrade options are compared in terms of their effluent quality and economic performance. A further comparison of two options with regard to the resulting receiving water quality reveals the paramount importance of this aspect, and highlights the inadequacy of evaluation frameworks limited to the performance relative to a sub-system (WWTP effluent) when a wider perspective (as induced by the EU Water Framework Directive) has to be adopted.

Temporal variations and trends in loads of commonly used pharmaceuticals to large wastewater treatment plants in Sweden, a case study (Ryaverket)

2016 ◽  
Vol 73 (12) ◽  
pp. 3049-3056 ◽  
Author(s):  
N. Paxéus ◽  
K. Bester ◽  
Haitham El-taliawy
Keyword(s):  
Wastewater Treatment ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Quality Standards ◽  
Temporal Variations ◽  
Chemical Analyses ◽  
Receiving Waters ◽  
The Eu

Abstract Loads of individual commonly used analgesics (ibuprofen, diclofenac), antibiotics (sulfamethoxazole, trimethoprim), β-blockers (atenolol, metoprolol, sotalol, propranolol) and neuroleptics (carbamazepine, citalopram) to a large-scale operating wastewater treatment plant (WWTP) in Sweden (Ryaverket) were studied by monitoring concentrations and flows during a 9-year period (2006–2015). Variations in loads due to sampling and possible errors in chemical analyses were estimated to be below 40%. The variations in loads were analyzed and discussed in terms of the design of collecting wastewater system as an integrated part of the water treatment at the WWTP as well as the prescription and use of individual pharmaceuticals. Trend analysis in daily loads of individual pharmaceuticals indicated an increase for diclofenac, no significant changes for ibuprofen and metoprolol and a decrease for the other pharmaceuticals. The latter was ascribed to a decrease in their prescription and use. The increase in loads of diclofenac was ascribed to its growing topical use not requiring prescription. In view of future regulations by the EU, growing loads of diclofenac to WWTPs and its low removal rates in WWTPs may require an upgrade of WWTPs to achieve quality standards for diclofenac in receiving waters.

Influence of Hydraulic Loading Rate on Horizontal Zeolite Wetland Effluent Quality

2012 ◽  
Vol 573-574 ◽  
pp. 659-662
Author(s):  
Hao Wang
Keyword(s):  
Wastewater Treatment ◽  
Loading Rate ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Hydraulic Loading Rate ◽  
Effluent Quality ◽  
Hydraulic Loading

In Tangshan area, the secondary effluent of wastewater treatment plants was used for this study. Horizontal zeolite wetland was carried out treating it. Hydraulic loading rate was the parameters for analyzing the nitrogen and phosphorus removal efficiency of pollutants from the secondary effluent of wastewater treatment plant. Zeolite constructed wetlands showed different behaviors for nitrogen and phosphorus removals.Under the optimum hydraulic loading rate, the primary pollutions were removed to a large extent.

Choice of the efficient flow diagram of biological wastewater treatment at municipal wastewater treatment plants

2021 ◽  
Vol 6 (4) ◽  
pp. 244-250
Author(s):  
Serhii Protsenko ◽  
◽  
Mykola Kizyeyev ◽  
Olha Novytska ◽  
◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Dynamic Modelling ◽  
Flow Diagram ◽  
Biological Wastewater Treatment ◽  
Municipal Wastewater Treatment ◽  
Residual Content

The possibility of increasing the efficiency of municipal wastewater treatment plant (WWTP) operation by changing the flow diagram of biological wastewater treatment in aeration tanks at minimum expenses for their reconstruction is shown in the paper on the example of one of the regional centres of Ukraine. The technology of nitri-denitrification of wastewater according to the flow diagram of the two-stage modified Ludzak-Ettinger process is offered for the considered conditions. The distribution of wastewater flows and internal nitrate recycling between the individual stages of this flow diagram has been optimized in order to minimize the residual content of total nitrogen in the treated effluents. Computer dynamic modelling of biochemical processes has proved the high efficiency and reliability of the flow diagram proposed by the authors.

Modelling of the Secondary Clarifier Combined with the Activated Sludge Model No. 1

1992 ◽  
Vol 25 (6) ◽  
pp. 285-300 ◽  
Author(s):  
René Dupont ◽  
Mogens Henze
Keyword(s):  
Wastewater Treatment ◽  
Simple Model ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Activated Sludge Model ◽  
Effluent Quality ◽  
Secondary Clarifier ◽  
Hydraulic Load ◽  
Flux Model

Modelling of activated sludge wastewater treatment plants is today generally based on the Activated Sludge Model No. 1 combined with a very simple model for the secondary settler. This paper describes the development of a model for the secondary clarifier based on the general flux theory for zone settling, which can be used in combination with the Activated Sludge Model to form a dynamic computer model/program for a wastewater treatment plant. In addition to the flux model, the developed model includes a simple model for predicting the contents of paniculate components in the effluent This latter model is a purely empirical model, which connects the effluent quality with the hydraulic load, suspended solids load and the nitrate load. The paper describes the model and gives some basic examples on computer simulations and verification of the model.

scholarly journals Chemometric Assessment of Bulgarian Wastewater Treatment Plants’ Effluents

Molecules ◽  
2020 ◽  
Vol 25 (19) ◽  
pp. 4408
Author(s):  
Galina Yotova ◽  
Tony Venelinov ◽  
Stefan Tsakovski
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Surface Water ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Surface Water Quality ◽  
Anthropogenic Sources ◽  
Multivariate Curve Resolution ◽  
Anthropogenic Activity ◽  
Wwtp Effluent

Surface water quality strongly depends on anthropogenic activity. Among the main anthropogenic sources of this activity are the wastewater treatment plant (WWTP) effluents. The discharged loads of nutrients and suspended solids could provoke serious problems for receiving water bodies and significantly alter the surface water quality. This study presents inventory analysis and chemometric assessment of WWTP effluents based on the mandatory monitoring data. The comparison between the Bulgarian WWTPs and previously reported data from other countries reveals that discharged loads from investigated WWTPs are lower. This is particularly valid for total suspended solids (TSS). The low TSS loads are the reason for the deviations of the typical calculated WWTP effluent ratios of Bulgarian WWTPs compared to the WWTPs worldwide. The performed multivariate analysis reveals the hidden factors that determine the content of WWTP effluents. The source apportioning based on multivariate curve resolution analysis provides detailed information for source contribution profiles of the investigated WWTP effluent loads and elucidate the difference between WWTPs included in this study.

scholarly journals Decision Support Concept to Selection of Wastewater Treatment Plant Location—the Case Study of Town of Kutina, Croatia

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 717 ◽  
Author(s):  
Nikša Jajac ◽  
Ivan Marović ◽  
Katarina Rogulj ◽  
Jelena Kilić
Keyword(s):  
Wastewater Treatment ◽  
Decision Support ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Optimal Solution ◽  
Location Selection ◽  
Complex Engineering ◽  
Engineering Projects ◽  
Selection Of

In environmental projects, decision-making can be a complex and challenging task due to the in-built existence of compromises between environmental, socio-political, and economic factors. This paper explores a systematic approach to developing a decision support concept that includes the analysis of wastewater treatment problems, knowledge acquisition, and the identification and evaluation of criteria that bring forth an optimal solution to the location selection of wastewater treatment plants (WWTPs). The objective of this research is to develop a decision support concept (DSC) to aid in the planning phases of complex engineering projects, such as the construction of WWTP. The development of the concept starts with an assessment of the issue and an identification of relevant stakeholders accepting their different views and attitudes in an attempt to resolve this issue. The DSC was tested on a real case project—WWTP location selection within the town of Kutina, Croatia. Results indicate that it is possible to develop such a concept based on multicriteria methods on which decision-makers can rely.

Impact of the volume of rain water on the operating constraints for a treatment plant

1999 ◽  
Vol 39 (2) ◽  
pp. 145-150
Author(s):  
T. Dormoy ◽  
B. Tisserand ◽  
L. Herremans
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Simulation Software ◽  
Quality Requirements ◽  
Effluent Quality ◽  
Operating Constraints ◽  
Pollution Loads

The new regulations require an increased amount of treatment of stormwater and a reduction of pollution loads discharged into the natural surroundings to be considered. Drainage systems therefore and particularly wastewater treatment plants should be sized correctly to cope with these peaks. Using a simulation software of wastewater treatment plant with activated sludge, such as SIMBAD, enables us to check that planned structures are appropriate in relation to the effluent quality requirements laid down, and to fix the most appropriate operating procedures. Operating constraints on a plant for treating stormwater are not negligible. It is advisable to allow for increased sludge production, O2 requirements and also sludge quality (fermentability).

Energy saving on wastewater treatment plants through improved online control: case study wastewater treatment plant Antwerp-South

2014 ◽  
Vol 69 (5) ◽  
pp. 1074-1079 ◽  
Author(s):  
Kris De Gussem ◽  
Alessio Fenu ◽  
Tom Wambecq ◽  
Marjoleine Weemaes
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Flow Direction ◽  
Treatment Plant ◽  
Advanced Control ◽  
Nutrient Removal Efficiency ◽  
Computational Fluid Dynamics Cfd

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.

Extension of two large wastewater treatment plants in Stockholm using membrane technology

2016 ◽  
Vol 11 (4) ◽  
pp. 744-753 ◽  
Author(s):  
S. Andersson ◽  
P. Ek ◽  
M. Berg ◽  
J. Grundestam ◽  
E. Lindblom
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Action Plan ◽  
Municipal Wastewater Treatment ◽  
Large Cities ◽  
Effluent Quality ◽  
Municipal Wastewater Treatment Plants ◽  
The Baltic ◽  
The Eu

Like many other large cities, Stockholm is facing increased urbanization with densification of infrastructure as a result. At the same time, implementation of the Baltic Sea Action Plan and the EU Water Framework Directive is expected to result in more stringent effluent quality demands. The current situation gives rise to new challenges for the municipal wastewater treatment plants (WWTPs). This paper describes how two of Sweden's largest municipal water organizations; Stockholm Vatten and Syvab, will face these challenges using ultrafiltration (UF) membrane bioreactor (MBR) technology. The effluent requirements for the rehabilitated plants are expected to be tightened to 6 mg/l and 0.2 mg/l for total nitrogen (TN) and total phosphorus (TP), respectively.

Sign in / Sign up

Export Citation Format

Share Document