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

1995 ◽  
Vol 31 (7) ◽  
pp. 1-12 ◽  
Author(s):  
J.-L. Bertrand-Krajewski ◽  
M. Lefebvre ◽  
B. Lefai ◽  
J.-M. Audic
Keyword(s):  
Storage Tank ◽  
Treatment Plant ◽  
Integrated Approach ◽  
Stormwater Treatment ◽  
Storm Events ◽  
Sewer System ◽  
Combined Sewer ◽  
The Future ◽  
Combined Sewer System ◽  
Storm Drainage

Urban storm drainage is considered using an integrated approach taking into account all parts of the sewer system: pipes, storage tanks, overflows, treatment plant and receiving waters. This paper presents an experimental research in Boran-sur-Oise (France) where continuous measurements are carried out in the combined sewer system (catchment area 61 ha), in the storage tank (245 m3) and in the treatment plant (3000 p.e.). One of the objectives is a comprehensive knowledge of effects of storm events on treatment plant process and efficiency. Catchment, sewer system, storage tank, treatment plant and measurements are described. Results for an autumn rainfall are given as an example. Many impacts on the treatment plant are observed. Despite the load increase compared with dry weather periods, especially for TSS and ammonia, the plant efficiency remains satisfactory. Short-term and long-term impacts are distinguished. New rules for storage tank operation are proposed to avoid hydraulic plant overloading and to use the stormwater solids-settling properties. These rules will be tested in the future to verify their compatibility with receiving water quality requirements. Measurements in upstream sewer system could also be used in the future to operate stormwater treatment systems during storm events.

Settleable Solids in a Combined Sewer System, Settling Characteristics, Heavy Metals, Efficiency of Storm Water Tanks

1993 ◽  
Vol 27 (5-6) ◽  
pp. 153-164 ◽  
Author(s):  
S. Michelbach ◽  
C. Wöhrle
Keyword(s):  
Heavy Metals ◽  
Settling Velocity ◽  
Urban Runoff ◽  
Stormwater Treatment ◽  
Sewer System ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Combined Sewer System ◽  
Water Tanks ◽  
The Relationship

Sedimentation and transportation of mineral and organic pollutions in combined sewer systems are not completely understood. For better understanding, samples of sediment, slime and urban runoff were taken from the combined sewer system of Bad Mergentheim. The settling velocity of settleable solids was measured with a settling apparatus. Typical settling curves for sediment, slime and wastewater were put together. Some of the samples were analysed for heavy metals and organic micro-pollution. By this the relationship between settling velocity and the load of heavy metals can be shown. The gained data are of interest for the design of clarifier tanks for stormwater treatment.

Stormwater Treatment in Combined Sewer Systems in Germany

1992 ◽  
Vol 26 (7-8) ◽  
pp. 1841-1849
Author(s):  
R. Pecher
Keyword(s):  
Design Process ◽  
Stormwater Treatment ◽  
Sewer System ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Combined Sewer System

The use of stormwater detention tanks and their effect on combined sewer system are discussed. The design process is outlined, with particular attention to the most recent ATV guidelines.

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

1999 ◽  
Vol 39 (2) ◽  
pp. 151-157
Author(s):  
A. Welker ◽  
U. Leinweber ◽  
K. Klepiszewski ◽  
T. G. Schmitt
Keyword(s):  
Stormwater Management ◽  
Waste Water Treatment ◽  
Management Strategies ◽  
Treatment Plant ◽  
River System ◽  
Ammonia Concentration ◽  
Waste Water Treatment Plant ◽  
Sewer System ◽  
Combined Sewer ◽  
Combined Sewer System

This is an investigation into possible changes to quantity and composition of sewage in the combined sewer system and the waste water treatment plant (WWTP) caused by new stormwater management strategies (mainly by disconnecting areas from the sewer system). Various scenarios were developed and the consequences on the water systems were calculated by using the simulation model KOSMO, in a fictional catchment. The results of the combined sewer overflow-calculation show an enormous decrease of the overflow annual load for different parameters (COD, ammonia) by the reduction of impervious surfaces. Thus, the overflow concentrations of some parameters increase dramatically under these conditions, in particular the ammonia concentration might cause critical situations (e.g. sensitive receiving water).

Settleable Solids in a Combined Sewer System – Measurement, Quantity, Characteristics

1992 ◽  
Vol 25 (8) ◽  
pp. 181-188 ◽  
Author(s):  
S. Michelbach ◽  
C. Wöhrle
Keyword(s):  
Heavy Metals ◽  
Settling Velocity ◽  
Organic Pollution ◽  
Stormwater Treatment ◽  
Organic Micropollutants ◽  
Sewer System ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Combined Sewer System ◽  
The Relationship

Sediment and transportation of mineral and organic pollution in combined sewer systems are not completely understood. For better understanding, samples of sediment, slime and urban runoff were taken from the combined sewer system of Bad Mergentheim. The sedimentation velocity of settleable solids was measured with a settling apparatus. Typical settling curves for sediment, slime and wastewater were compiled. Some of the samples were analysed for heavy metals and organic micropollutants. By this the relationship between settling velocity and the load of heavy metals can be shown. The gained data are of interest to size clarifier tanks for stormwater treatment.

Settleable Solids in a Combined Sewer System: “Settling Characteristics – Pollution Load – Stormwater Tanks”

1993 ◽  
Vol 27 (12) ◽  
pp. 187-190 ◽  
Author(s):  
S. Michelbach ◽  
C. Wöhrle
Keyword(s):  
Heavy Metals ◽  
Settling Velocity ◽  
Urban Runoff ◽  
Stormwater Treatment ◽  
Pollution Load ◽  
Sewer System ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Combined Sewer System ◽  
The Relationship

Sedimentation and transportation of mineral and organic pollutants in combined sewer systems are not completely understood. For better understanding, samples of sediment, slime and urban runoff were taken from the combined sewer system of Bad Mergentheim. The settling velocity of settleable solids was measured with a settling apparatus. Typical settling curves for sediment, slime and wastewater were put together. Some of the samples were analysed for heavy metals and organic micropollution to see the relationship between settling velocity and the load of heavy metals of settleable solids. The gained data are of interest for the design of clarifier tanks for stormwater treatment.

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.

Radar-aided CSO-control-criteria for an ecological approach

1997 ◽  
Vol 36 (8-9) ◽  
pp. 223-228
Author(s):  
A. Petruck ◽  
F. Sperling
Keyword(s):  
Critical Time ◽  
Integrated Approach ◽  
Control Measures ◽  
Real Time Control ◽  
Sewer System ◽  
Time Control ◽  
Physical Measurements ◽  
Combined Sewer ◽  
Receiving Stream ◽  
Control Criteria

The control strategy of a combined sewer system incorporating three stormwater storage tanks with overflows presented here attempts to consider all aspects of acute CSO effects. These are the hydraulic and the composition components as well as the time factor. The result is an integrated approach, which is not based on the classic emission view (i.e. reduction of volume), but on pollution criteria (i.e. possible harm to the biotic community). The aim is to reduce the exceeding of critical peak values of the CSO components at critical time intervals. Control decisions will be based on continuous measurements in the sewer system and in the receiving stream. Furthermore the measurements are carried out to determine the effects (both hydraulic and chemical) of particular CSO discharges in order to evolve the critical values for the project area. The chemical and physical measurements are accompanied by a biological monitoring programme. Macroinvertebrates are sampled upstream and downstream of outfalls and at a reference site. This allows the evaluation of the control measures on an ecological basis, and thus an assessment of the ecological potential of radar-aided real-time control of the combined sewer systems.

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