An application of Austrian legal requirements for CSO emissions

2011 ◽  
Vol 64 (5) ◽  
pp. 1081-1088 ◽  
Author(s):  
Manfred Kleidorfer ◽  
Wolfgang Rauch
Keyword(s):  
Model Calibration ◽  
Model Building ◽  
Treatment Plant ◽  
Cost Effective ◽  
Combined Sewer Overflows ◽  
Sewer System ◽  
Legal Requirements ◽  
Innovative Methods ◽  
Combined Sewer

The Austrian standard for designing combined sewer overflow (CSO) detention basins introduces the efficiency of the combined sewer overflows as an indicator for CSO pollution. Additionally criteria for the ambient water quality are defined, which comprehend six kinds of impacts. In this paper, the Austrian legal requirements are described and discussed by means of hydrological modelling. This is exemplified with the case study Innsbruck (Austria) including a description for model building and model calibration. Furthermore an example is shown in order to demonstrate how – in this case – the overall system performance could be improved by implementing a cost-effective rearrangement of the storage tanks already available at the inflow of the wastewater treatment plant. However, this guideline also allows more innovative methods for reducing CSO emissions as measures for better usage of storage volume or de-centralised treatment of stormwater runoff because it is based on a sewer system simulation.

The Role of Computer Modeling in Combined Sewer Overflow Abatement Planning

1992 ◽  
Vol 26 (7-8) ◽  
pp. 1831-1840 ◽  
Author(s):  
L. A. Roesner ◽  
E. H. Burgess
Keyword(s):  
System Modeling ◽  
Cost Effective ◽  
Combined Sewer Overflows ◽  
Sewer System ◽  
New Techniques ◽  
Hydraulic Simulation ◽  
Continuous Simulation ◽  
Combined Sewer ◽  
The U.S

Increased concern regarding water quality impacts from combined sewer overflows (CSOs) in the U.S. and elsewhere has emphasized the role of computermodeling in analyzing CSO impacts and in planning abatement measures. These measures often involve the construction of very large and costly facilities, and computer simulation during plan development is essential to cost-effective facility sizing. An effective approach to CSO system modeling focuses on detailed hydraulic simulation of the interceptor sewers in conjunction with continuous simulation of the combined sewer system to characterize CSOs and explore storage-treatment tradeoffs in planning abatement facilities. Recent advances in microcomputer hardware and software have made possible a number of new techniques which facilitate the use of computer models in CSO abatement planning.

Emission-immission based design of combined sewer overflows and treatment plant - the dresden case study

1997 ◽  
Vol 36 (8-9) ◽  
pp. 355-359
Author(s):  
L. Fuchs ◽  
D. Gerighausen ◽  
S. Schneider
Keyword(s):  
Treatment Plant ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Sewer Overflows ◽  
Set Up ◽  
The City

For the city of Dresden a general master plan was set up based on investigations of the hydraulic capacity of the sewer system, the loads from combined sewer overflow and the treatment plant. The total emission from combined sewer overflows and treatment plant was the main criteria for the analysis of the efficiency of different renovation alternatives. The effect of the different alternatives on the quality of the receiving waters was investigated with a water quality model and evaluated with different approaches.

INTEGRATED PLANNING OF IMPROVEMENTS OF SEWER SYSTEM AND TREATMENT PLANT FOR SUBURBS OF COPENHAGEN

1994 ◽  
Vol 30 (1) ◽  
pp. 157-166 ◽  
Author(s):  
O. B. Hansen ◽  
J. Pedersen
Keyword(s):  
Waste Water Treatment ◽  
Treatment Plant ◽  
Cost Effective ◽  
Total System ◽  
Integrated Planning ◽  
Sewer System ◽  
Sanitary Sewer ◽  
Combined Sewer ◽  
Sewer Rehabilitation ◽  
Realtime Control

An integrated planning study for improvements of sewer system and treatment plant for a catchment in western Greater Copenhagen is presented. Alternative improvements of the total system are analysed using a mathematical model for the runoff in the sewer system taking into account the interdependencies between sewer system and treatment plant. The most cost-effective solution was identified through optimization of the hydraulic capacity of the treatment plant. The improvements of the selected solution consist of a realtime control (RTC) system for the combined sewer network, elimination of faulty connections to the separate sanitary sewer system, rehabilitation of untight sewers and extension of the treatment plant to meet stricter effluent criteria. The study was implemented as an interdisciplinary excercise between specialists in the fields of sewer modelling, sewer rehabilitation and waste water treatment.

Integrated design of sewers and wastewater treatment plants

2002 ◽  
Vol 46 (9) ◽  
pp. 11-20 ◽  
Author(s):  
J. Vollertsen ◽  
T. Hvitved-Jacobsen ◽  
Z. Ujang ◽  
S.A. Talib
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Integrated Design ◽  
Cost Effective ◽  
Wastewater Management ◽  
Plant Design ◽  
Sewer System ◽  
Process Simulations

Sewer system design must be integrated with wastewater treatment plant design when moving towards a more sustainable urban wastewater management. This integration allows an optimization of the design of both systems to achieve a better and more cost-effective wastewater management. Hitherto integrated process design has not been an option because the tools to predict in-sewer wastewater transformations have been inadequate. In this study the WATS model - being a new and validated tool for in-sewer microbial process simulations - is presented and its application for integrated sewer and treatment plant design is exemplified. A case study on a Malaysian catchment illustrates this integration. The effects of centralization of wastewater treatment and the subsequently longer transport distances are addressed. The layout of the intercepting sewer is optimized to meet the requirements of different treatment scenarios.

Numerical Investigation of the Efficiency of the Treatment Shaft for Separation of Suspended Solids in Wastewater Treatment

2018 ◽  
Author(s):  
Sina Jahangiri Mamouri ◽  
Saad A. Ghalib ◽  
André Bénard
Keyword(s):  
Separation Efficiency ◽  
Treatment Plant ◽  
Municipal Sewage ◽  
Combined Sewer Overflows ◽  
Sewer System ◽  
Shaft System ◽  
Combined Sewer ◽  
Effective Technology ◽  
Slow Velocity ◽  
Computational Fluid Dynamics Cfd

A combined sewer system is a facility that collects both municipal sewage and surface runoffs. These facilities may overflow (combined sewer overflow or CSO) during large storms which results in serious pollution, i.e. the flows exceed the capacity of the treatment plant. An approach to reduce the number of combined sewer overflows is to store rainfall runoffs temporarily [1]. The Treatment Shaft system is a relatively new but proven patented technology (U.S. Patent [2] and other patents) that includes the necessary CSO control and treatment, with less footprints than existing systems, and at a reduced cost. In this system, wastewater is collected in a large shaft equipped with baffles and partitions designed to ensure a very slow velocity within the system. In this study, the efficiency of the Treatment Shaft system for separation of solid contents without the use of flocculation agents is investigated. Moreover, the effect of geometry modifications on the separation efficiency is evaluated. For this purpose, a Computational Fluid Dynamics (CFD) approach for multiphase flow of particulate wastewater is used to evaluate the performance of various Treatment Shaft designs for a 10-year, 1-hour rainstorm event. It is shown that the Treatment Shaft is an effective technology to separate particles larger than 175μm, and more than 50% of the particles of size 175μm or more are settled. Additionally, several design variations are assessed and a design with a less footprint is specified.

Modelling of Combined Sewer Overflow Impacts on the Receiving Water Quality: Case Studies Hron and Drava

2017 ◽  
Author(s):  
Marek Sokáč ◽  
Marta Jerković
Keyword(s):  
Water Quality ◽  
Case Studies ◽  
Slovak Republic ◽  
Treatment Plant ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
The Town ◽  
Receiving Water

Paper analyses the influences of combined sewer overflows (CSO’s), on the receiving water quality, but generally deals also with various types of storm water management in urban areas. The first case study analyses the impacts of the continuous (wastewater treatment plant in the town Osijek) and discontinuous pollution sources (CSO’s in the town Osijek) on the quality of the receiving water – the Drava river (Croatia). The second modelling case study was performed on the river Hron (Slovak republic). In this study, the impacts on the water quality from combined sewer overflows form the biggest town on Hron River – Banská Bystrica were studied, as well as four feasible alternatives of storm sewer management (different mixing ratio, different size of storm tanks) were analysed. For both case studies, the mathematical simulation model MIKE11 (Danish Hydraulic Institute, DHI) was used.

Storm Water Loading of Greater Copenhagen Sewage Treatment Plant

1993 ◽  
Vol 27 (12) ◽  
pp. 183-186
Author(s):  
O. B. Hansen ◽  
C. Jacobsen ◽  
P. Skat Nielsen
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Real Time Control ◽  
Combined Sewer Overflows ◽  
Sewer System ◽  
Time Control ◽  
Combined Sewer ◽  
Modelling Studies ◽  
Plant Modelling

Copenhagen's plans to cut pollution loads from combined sewer overflows involves increased storage capacity in the sewer system, real time control of that system, and increased hydraulic loading for the treatment plant. Modelling studies have been used to examine the consequences.

Implementation of Hamilton-Wentworth Region’s Pollution Control Plan

1996 ◽  
Vol 31 (3) ◽  
pp. 453-472 ◽  
Author(s):  
M. Stirrup
Keyword(s):  
Wastewater Treatment ◽  
Pollution Control ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Control Measures ◽  
Storm Events ◽  
Combined Sewer Overflows ◽  
Control Plan ◽  
Combined Sewer ◽  
Sewer Overflows

Abstract The Regional Municipality of Hamilton-Wentworth operates a large combined sewer system which diverts excess combined sewage to local receiving waters at over 20 locations. On average, there are approximately 23 combined sewer overflows per year, per outfall. The region’s Pollution Control Plan, adopted by Regional Council in 1992, concluded that the only reasonable means of dealing with large volumes of combined sewer overflow in Hamilton was to intercept it at the outlets, detain it and convey it to the wastewater treatment plant after the storm events. The recommended control strategy relies heavily on off-line storage, with an associated expansion of the Woodward Avenue wastewater treatment plant to achieve target reductions of combined sewer overflows to 1–4 per year on average. The region has begun to implement this Pollution Control Plan in earnest. Three off-line detention storage tanks are already in operation, construction of a fourth facility is well underway, and conceptual design of a number of other proposed facilities has commenced. To make the best possible use of these facilities and existing in-line storage, the region is implementing a microcomputer-based real-time control system. A number of proposed Woodward Avenue wastewater treatment plant process upgrades and expansions have also been undertaken. This paper reviews the region's progress in implementing these control measures.

Long-Term Simulation of Pollutant Loads in Treatment Plant Effluents and Combined Sewer Overflows

1990 ◽  
Vol 22 (10-11) ◽  
pp. 69-76 ◽  
Author(s):  
A. Durchschlag
Keyword(s):  
Waste Water Treatment ◽  
Treatment Plant ◽  
Storm Water ◽  
Water Runoff ◽  
Storage Tanks ◽  
Combined Sewer Overflows ◽  
Storm Water Runoff ◽  
Combined Sewer ◽  
Hydraulic Load ◽  
Water Tanks

As a result of urbanization, the pollutant discharges from sources such as treatment plant effluents and polluted stormwaters are responsible for an unacceptable water quality in the receiving waters.In particular, combined sewer system overflows may produce great damage due to a shock effect. To reduce these combined sewer overflow discharges, the most frequently used method is to build stormwater storage tanks. During storm water runoff, the hydraulic load of waste water treatment plants increases with additional retention storage. This might decrease the treatment efficiency and thereby decrease the benefit of stormwater storage tanks. The dynamic dependence between transport, storage and treatment is usually not taken into account. This dependence must be accounted for when planning treatment plants and calculating storage capacities in order to minimize the total pollution load to the receiving waters. A numerical model will be described that enables the BOD discharges to be continuously calculated. The pollutant transport process within the networks and the purification process within the treatment plants are simulated. The results of the simulation illustrate; a statistical balance of the efficiency of stormwater tanks with the treatment plant capacity and to optimize the volume of storm water tanks and the operation of combined sewer systems and treatment plants.

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