Field campaign on sediment transport behaviour in a pressure main from pumping station to wastewater treatment plant in Berlin

As part of the project KURAS, the Berliner Wasserbetriebe realized a field campaign in 2015 in order to increase the process knowledge regarding the behaviour of transported sediment in the pressure main leading from the pumpstation to the wastewater treatment plant. The field campaign was conducted because of a lack of knowledge about the general condition of the pressure main due to its bad accessibility and the suspicion of deposits caused by hydraulic underload. The practical evidence of the sediment transport performance of this part of the sewer system, dependent on different load cases, should present a basis for further analysis, for example regarding flushing measures. A positive side-effect of the investigation was the description of the amount of pollutants caused by different weather conditions in combined sewer systems and the alterations of the sewage composition due to biogenic processes during transport. The concept included the parallel sampling of the inflow at the pumpstation and the outflow at the end of the pressure main during different weather conditions. By calculating the inflow to the pressure main, as well as its outflow at different flow conditions, it was possible to draw conclusions in regard to the transport behaviour of sediment and the bioprocesses within an 8.5 km section of the pressure main. The results show clearly that the effects of sedimentation and remobilization depend on the flow conditions. The balance of the total suspended solids (TSS) load during daily variations in dry weather shows that the remobilization effect during the run-off peak is not able to compensate for the period of sedimentation happening during the low flow at night. Based on the data for dry weather, an average of 238 kg of TSS deposits in the pressure main remains per day. The remobilization of sediment occurs only due to the abruptly increased delivery rates caused by precipitation events. These high pollution loads lead to a sudden strain at the wastewater treatment plant. It was found that the sediment transport behaviour is characterized by sedimentation up to a flow velocity of 0.35 m/s, while remobilization effects occur above 0.5 m/s. The assumption of bad sediment transport performance in the pressure main was confirmed. Therefore, the results can be used as a basis for further analysis, for example regarding periodical flushing as a means of cleaning the pressure main. The findings, especially regarding the methods and processes, are transferable and can be applied to other pressure mains in combined sewer systems. Besides the outlined evaluation of the sediment transport behaviour of the pressure main, the collected data were used in the project to calibrate a sewer system model, including a water quality model for the catchment area, and as a contribution towards an early physically based sediment transport modelling in InfoWorks CS.

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Sediment transport under dry weather conditions in a small sewer system

Water Science & Technology ◽

10.2166/wst.1998.0038 ◽

1998 ◽

Vol 37 (1) ◽

pp. 155-162

Author(s):

Flemming Schlütter ◽

Kjeld Schaarup-Jensen

Keyword(s):

Sediment Transport ◽

Field Data ◽

Field Measurements ◽

Weather Conditions ◽

Sewer System ◽

Transport Models ◽

Sewer Systems ◽

Combined Sewer ◽

Initial Results

Increased knowledge of the processes which govern the transport of solids in sewers is necessary in order to develop more reliable and applicable sediment transport models for sewer systems. Proper validation of these are essential. For that purpose thorough field measurements are imperative. This paper renders initial results obtained in an ongoing case study of a Danish combined sewer system in Frejlev, a small town southwest of Aalborg, Denmark. Field data are presented concerning estimation of the sediment transport during dry weather. Finally, considerations on how to approach numerical modelling is made based on numerical simulations using MOUSE TRAP (DHI 1993).

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Integral and unified model for the sewer and wastewater treatment plant focusing on transformations

Water Science & Technology ◽

10.2166/wst.2003.0629 ◽

2003 ◽

Vol 47 (12) ◽

pp. 65-71 ◽

Cited By ~ 2

Author(s):

J.L. Huisman ◽

P. Krebs ◽

W. Gujer

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Treatment Plant ◽

New Combination ◽

Urban Drainage ◽

State Variables ◽

Sewer System ◽

Sewer Systems ◽

To Come ◽

Removal Model

The urban drainage cycle is a very complex system with many interacting processes. Models are a great help to test different scenarios and improve the understanding of this system. At present, good models exist for the hydrodynamics of the sewer systems, for the biological conversions in the wastewater treatment plant (ASM 1 to 3) and for the receiving water (RWQM1). However, the traditional transport and conversion models for the sewer system are incompatible with the ASM definitions, making it difficult to link the models to come an integral and unified urban drainage model. In this work, a new sewer system model that is based on ASM3 has been coupled to an advanced nutrient removal model for the wastewater treatment plant. As both models are based on ASM3, they are unified in their definitions of the state variables and processes. This new combination has been used to test different scenarios and to test the influence of the sewer system on the treatment plant.

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Effects of integrated stormwater management strategies on the combined sewer system and the wastewater treatment plant-river system

Water Science & Technology ◽

10.1016/s0273-1223(99)00019-0 ◽

1999 ◽

Vol 39 (2) ◽

Cited By ~ 1

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Stormwater Management ◽

Management Strategies ◽

Treatment Plant ◽

River System ◽

Sewer System ◽

Combined Sewer ◽

Combined Sewer System

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Flow and pollutant measurements in a combined sewer system to operate a wastewater treatment plant and its storage tank during storm events

Water Science & Technology ◽

10.1016/0273-1223(95)00317-g ◽

1995 ◽

Vol 31 (7) ◽

Cited By ~ 6

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Storage Tank ◽

Treatment Plant ◽

Storm Events ◽

Sewer System ◽

Combined Sewer ◽

Combined Sewer System

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Implementation of Hamilton-Wentworth Region’s Pollution Control Plan

Water Quality Research Journal ◽

10.2166/wqrj.1996.026 ◽

1996 ◽

Vol 31 (3) ◽

pp. 453-472 ◽

Cited By ~ 2

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.

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Optimisation and control of the inflow to a wastewater treatment plant using integrated modelling tools

Water Science & Technology ◽

10.2166/wst.1998.0083 ◽

1998 ◽

Vol 37 (1) ◽

pp. 347-354 ◽

Cited By ~ 2

Author(s):

Ole Mark ◽

Claes Hernebring ◽

Peter Magnusson

Keyword(s):

Wastewater Treatment ◽

Real Time ◽

Wastewater Treatment Plant ◽

Treatment Plant ◽

Pilot Project ◽

Integrated Modelling ◽

Real Time Control ◽

Sewer System ◽

Time Control ◽

The Impact

The present paper describes the Helsingborg Pilot Project, a part of the Technology Validation Project: “Integrated Wastewater” (TVP) under the EU Innovation Programme. The objective of the Helsingborg Pilot Project is to demonstrate implementation of integrated tools for the simulation of the sewer system and the wastewater treatment plant (WWTP), both in the analyses and the operational phases. The paper deals with the programme for investigating the impact of real time control (RTC) on the performance of the sewer system and wastewater treatment plant. As the project still is in a very early phase, this paper focuses on the modelling of the transport of pollutants and the evaluation of the effect on the sediment deposition pattern from the implementation of real time control in the sewer system.

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Integrated modelling: comparison of state variables, processes and parameters in sewer and wastewater treatment plant models

Water Science & Technology ◽

10.2166/wst.1997.0235 ◽

1997 ◽

Vol 36 (5) ◽

pp. 373-380 ◽

Cited By ~ 2

Author(s):

C. Fronteau ◽

W. Bauwens ◽

P.A. Vanrolleghem

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Treatment Plant ◽

Drainage System ◽

Integrated Modelling ◽

Urban Drainage ◽

State Variables ◽

Sewer System ◽

Wastewater Treatment Process ◽

Urban Drainage System

All the parts of an urban drainage system, i.e. the sewer system, the wastewater treatment plant (WWTP) and the river, should be integrated into one single model to assess the performance of the overall system and for the development of design and control strategies assisting in its sustainable and cost effective management. Existing models for the individual components of the system have to be merged in order to develop the integrated tool. One of the problems arising from this methodology is the incompatibility of state variables, processes and parameters used in the different modelling approaches. Optimisation of an urban drainage system, and of the wastewater treatment process in particular, requires a good knowledge of the wastewater composition. As important transformations take place between the emission from the household and the arrival at the treatment facility, sewer models should include these transformations in the sewer system. At present, however, research is still needed in order to increase our knowledge of these in-sewer processes. A comparison of the state variables, processes and parameters has been carried out in both sewer models (SMs) and activated sludge models (ASMs). An ASM approach is used for the description of reactions in sewer models. However, a difference is found in the expression for organic material (expressed in terms of BOD) and heterotrophic biomass is absent as a state variable, resulting in differences in processes and parameters. Reconciliation of both the models seems worthwhile and a preliminary solution is suggested in this paper.

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Decentralized Adaptive PI with Adaptive Interaction Algorithm of Wastewater Treatment Plant

Jurnal Teknologi ◽

10.11113/jt.v67.2837 ◽

2014 ◽

Vol 67 (5) ◽

Author(s):

M. F. Rahmat ◽

S. I. Samsudin ◽

N. A. Wahab ◽

Mashitah Che Razali ◽

Muhammad Sani Gaya

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Error Function ◽

Treatment Plant ◽

Weather Conditions ◽

Pi Controller ◽

Effluent Quality ◽

Dynamic Performances ◽

Adaptive Interaction

Wastewater treatment plant (WWTP) is highly known with the variation and uncertainty of the parameters, making them a challenge to be tuned and controlled. In this paper, an adaptive decentralized PI controller is developed for nonlinear activated sludge WWTP. The work is highlighted in auto-tuning the PI control parameters in satisfying straighten effluent quality and hence optimizing the nitrogen removal. The PI controller parameters are obtained by using simple updating algorithm developed based on adaptive interaction theory. The error function is minimized directly by approximate Frechet tuning algorithm without explicit estimation of the model. The effectiveness of the proposed controller is then validated by comparing the performance of activated sludge process to the benchmark PI under three different weather conditions with realistic variations in influent flow rate and composition. The algorithm is effectively applied in activated sludge system with improved dynamic performances in effluent quality index and energy consumed of Benchmark Simulation Model No.1.

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