Methods of Estimating the Discharge of Gross Solids from Combined Sewer Systems

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1295-1304 ◽  
Author(s):  
C. Jefferies
Keyword(s):  
Research Centre ◽  
Combined Sewer Overflows ◽  
Water Research ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
The Uk

Visible pollution discharged from two combined sewer overflows were studied using passive Trash Trap devices and the UK Water Research Centre Gross Solids Sampler. Relationships are presented for the number of visible solids and the mass of gross solids discharged during an event. The differences in the behaviour of the overflow types are reported on and they are categorised using the Trash Traps.

A laboratory study of the erosion and transport of cohesive-like sediment mixtures in sewers

1998 ◽  
Vol 37 (1) ◽  
pp. 163-170 ◽  
Author(s):  
Simon J. Tait ◽  
Peter J. Rushforth ◽  
Adrian J. Saul
Keyword(s):  
Laboratory Study ◽  
Significant Degree ◽  
Combined Sewer Overflows ◽  
Sewer Systems ◽  
Hydraulic Conditions ◽  
Combined Sewer ◽  
Water Courses ◽  
The Uk ◽  
Sediment Mixtures ◽  
Initial Results

Surveys of sewers in the UK have indicated that many sewer systems have significant in-sewer deposits. Many of these existing combined sewers have been constructed at such a gradient and experience such a range of hydraulic conditions that over a period of time they experience repeated phases of sediment deposition, erosion and transport. Deposition of sediment in sewers with its consequent loss of discharge capacity can lead to the surcharging of sewerage systems and the premature operation of combined sewer overflows. The sudden erosion and transport of large quantities of deposited in-sewer sediments during periods of increased flow can significantly contribute to the pollution load imposed on receiving water courses and sewerage treatment plants. It is therefore important not only to be able to estimate the hydraulic performance of sewers but also the conditions under which significant erosion of deposited sediments occur. This paper reports on the rationale behind and the initial results from a laboratory study which aims to investigate the erosion and transport of “cohesive-like” sediment mixtures in controlled laboratory conditions. The choice of the sediments used was aimed at representing the characteristics of sewer sediment mixtures found in the field. These deposits have been found to exhibit a significant degree of cohesion not found in previously studied granular sediment beds.

scholarly journals Using data from monitoring combined sewer overflows to assess, improve, and maintain combined sewer systems

2015 ◽  
Vol 505 ◽  
pp. 1053-1061 ◽  
Author(s):  
A. Montserrat ◽  
Ll. Bosch ◽  
M.A. Kiser ◽  
M. Poch ◽  
Ll. Corominas
Keyword(s):  
Combined Sewer Overflows ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
Using Data

Pollutant Release from Sediments in Sewer Systems and Their Potential for Release into Receiving Waters

1993 ◽  
Vol 28 (8-9) ◽  
pp. 161-169 ◽  
Author(s):  
I. McGregor ◽  
R. M. Ashley ◽  
K. O K. Oduyemi
Keyword(s):  
Research Centre ◽  
Shear Stresses ◽  
Quality Models ◽  
Water Research ◽  
Sediment Samples ◽  
Lower Shear ◽  
Sewer Systems ◽  
Receiving Waters ◽  
Flow Quality ◽  
The Uk

A programme of work funded by the UK Water Research Centre (WRc) has been carried out to investigate the nature, occurrence and re-entrainment into the sewage flow of sewer sediments and their associated pollutants to provide data for the development of UK sewer flow quality models, MOSQITO and MOUSETRAP. Methodologies for the preparation of sewer sediment samples prior to chemical analysis are described. These methods have been developed to determine the level of pollutants released from sewer sediments which will be representative of the conditions found in the sewer environment. Application of progressively lower shear stresses to samples of sediment, from an extreme, via blending, to less severe preparative methods by means of a stirring technique, fractionate sediment samples so that the polluting potential may be assessed separately for both dissolved and resuspendable phases. Stirring preparative methods release less pollutants from a sediment sample than from the blending procedures, with the level of pollutant release being dependent upon the shear stress being applied to the sample, with higher shear values releasing as would be expected, more pollutants.

Failure of sewage pumps: statistical modelling and impact assessment

2006 ◽  
Vol 54 (6-7) ◽  
pp. 119-126
Author(s):  
H. Korving ◽  
M. Geise ◽  
F. Clemens
Keyword(s):  
Statistical Modelling ◽  
Interarrival Time ◽  
Environmental Damage ◽  
Combined Sewer Overflows ◽  
Pump Failure ◽  
Failure Data ◽  
Sewer Systems ◽  
Pumping Stations ◽  
Combined Sewer ◽  
Sewer Overflows

Sewage pumping stations are directly responsible for affecting performance, i.e. failing pumps may result in combined sewer overflows or flooding. However, failures of sewage pumps are not yet incorporated in sewer assessments due to lack of knowledge and data. This paper presents the analysis of pump failure data provided by two sewer management authorities in The Netherlands. Pump failures have been studied accounting for the nature of the failures, the operation and maintenance procedures of the management authority, the ageing of the pumps and the changes in the environment of pumps. The analysis shows that sewage pumps fail relatively often due to the composition of sewage and the discontinuous operation of the pumps. The interarrival time and the duration of failures are highly variable and independent of the pump type and the specific function of the pump. The results also indicate that the serviceability of sewer systems is significantly affected by failing pumps. As a consequence, part of the environmental damage due to CSOs (combined sewer overflows) can be avoided by improving maintenance of pumping stations.

Design and performance evaluation of a simplified dynamic model for combined sewer overflows in pumped sewer systems

2016 ◽  
Vol 538 ◽  
pp. 609-624 ◽  
Author(s):  
Petra van Daal-Rombouts ◽  
Siao Sun ◽  
Jeroen Langeveld ◽  
Jean-Luc Bertrand-Krajewski ◽  
François Clemens
Keyword(s):  
Performance Evaluation ◽  
Dynamic Model ◽  
Combined Sewer Overflows ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
And Performance

The impacts of discharges from two combined sewer overflows on the water quality of an urban watercourse

1997 ◽  
Vol 36 (8-9) ◽  
pp. 195-199 ◽  
Author(s):  
R. Mulliss ◽  
D. M. Revitt ◽  
R. B. E. Shutes
Keyword(s):  
Water Quality ◽  
Storm Event ◽  
Combined Sewer Overflows ◽  
Ecosystem Classification ◽  
Combined Sewer ◽  
Total Ammonia ◽  
Sewer Overflows ◽  
Urban Watercourse ◽  
The Uk

The impacts of combined sewer overflows and surface water outfalls on receiving water quality are assessed by comparing dry weather flow and storm event concentrations of dissolved oxygen, BOD, total and unionised ammonia, pH, dissolved copper and total zinc with those recommended by the River Ecosystem classification guidelines for freshwaters in the UK. The deteriorating conditions during wet weather are identified by water quality falling below the RE2 category for all monitored pollutants, other than dissolved copper, and reaching the most grossly polluted condition for BOD and total ammonia.

Urban Storm Water Discharges: Effects upon Communities of Sessile Diatoms and Macro-Invertebrates

1990 ◽  
Vol 22 (10-11) ◽  
pp. 147-154 ◽  
Author(s):  
G. D. Willemsen ◽  
H. F. Gast ◽  
R. O. G. Franken ◽  
J. G. M. Cuppen
Keyword(s):  
Organic Pollution ◽  
Constant Flow ◽  
Combined Sewer Overflows ◽  
Sewer System ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Receiving Waters ◽  
Sewer Overflows ◽  
Urban Storm

From 1985 to 1987, long-term and more or less permanent effects of discharges from combined or separate sewer systems on communities of sessile diatoms and macro-invertebrates in receiving waters have been studied. Sessile diatoms and/or macro-invertebrates have been investigated on 46 locations, spread all over The Netherlands. The results were related to the type of sewer system, the discharges, and the characteristics of the receiving water, and compared with results from sample(s) taken from a corresponding water not influenced by sewer overflows, the reference water. In general, communities of sessile diatoms and macro-invertebrates indicate a more severe organic pollution and disturbance of receiving waters compared with reference waters. In the immediate vicinity of the overflows these communities were more disturbed than at some distance. In small ditches, effects were more pronounced compared with large waterbodies and waters with a constant flow regime. Finally, effects of combined sewer overflows were more pronounced than effects of discharges from separate sewer systems, except for locations in industrial areas.

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.

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