Removal of Suspended Solids and Phosphorous in Combined Sewer Overflows (CSOs) by Filtration Apparatus with Expanded Waste-Glass Filter Media

Abstract An elutriation apparatus has been proposed for determining the settling velocity distributions of suspended solids in combined sewer overflows (CSOs). The apparatus consisted of a series of interconnected cylindrical settling chambers, through which the sample was drawn using a peristaltic pump attached to the outlet of the last settling chamber. Since the diameters of the cylinders were progressively increasing, sediment with different settling velocities settled in different cylinders. By measuring the amount of sediment in each cylinder, the settling velocity distribution was deduced. The apparatus was tested using samples from a CSO outfall in Hamilton, Ontario, Canada. The test results showed that the apparatus performed well for determining settling characteristics of suspended solids and chemical distribution in different settling fractions. The effectiveness of polymer addition to enhance flocculation and settling of CSOs was also tested in this apparatus. The elutriation apparatus proposed here offers several advantages over the traditional methods (i.e., settling columns) of measurements of settling velocity distributions. The main advantage is its ability to measure the distributions under dynamic conditions, i.e., in the presence of flow. Consequently, the elutriation apparatus reproduces flow conditions in actual settling tanks better than conventional settling columns.

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Comparing peracetic acid and hypochlorite for disinfection of combined sewer overflows: Effects of suspended-solids and pH

The Science of The Total Environment ◽

10.1016/j.scitotenv.2017.04.179 ◽

2017 ◽

Vol 599-600 ◽

pp. 533-539 ◽

Cited By ~ 27

Author(s):

M. McFadden ◽

J. Loconsole ◽

A.J. Schockling ◽

R. Nerenberg ◽

J.P. Pavissich

Keyword(s):

Peracetic Acid ◽

Suspended Solids ◽

Combined Sewer Overflows ◽

Combined Sewer ◽

Sewer Overflows

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Distribution of Sedimentation Rates of Suspended Solids and Heavy Metals in Combined Sewer Overflows

Water Science & Technology ◽

10.2166/wst.1990.0289 ◽

1990 ◽

Vol 22 (10-11) ◽

pp. 61-68 ◽

Cited By ~ 4

Author(s):

Alfred P. Benoist ◽

Lambertus Lijklema

Keyword(s):

Heavy Metals ◽

Suspended Solids ◽

Discharge Rate ◽

Fine Fraction ◽

Sedimentation Rates ◽

Combined Sewer Overflows ◽

Quality Model ◽

Combined Sewer ◽

Sewer Overflows ◽

Settling Rates

Measured absolute concentrations and the distributions of sedimentation rates (DSR's) of suspended solids (SS) and heavy metals in Combined Sewer Overflows (CSO's) show a strong variation between events. These variations can be explained partly by a relationship between the maximum discharge rate during an overflow and a) the concentrations of SS and the heavy metals Pb and Zn and b) the fraction of the DSR with high settling rates and the associated Pb concentrations. However, no unambiguous relationship between the DSR for the SS concentrations and the associated heavy metal concentrations has been detected. In contrast to the general experience a specific association of heavy metals with the fine fraction (low settling rates) in the SS of CSO's has not been found. The measured DSR's of SS and heavy metals have been used as input to a receiving water quality model. The simulated response is satisfactory, with regard to SS concentrations but not for heavy metals.

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Peracetic Acid (PAA) for Disinfection of Combined Sewer Overflows (CSOs): Effect of Suspended Solids Size on Bacterial Inactivation

Proceedings of the Water Environment Federation ◽

10.2175/193864715819556129 ◽

2015 ◽

Vol 2015 (6) ◽

pp. 3892-3899

Author(s):

J. P Pavissich ◽

M McFadden ◽

A. J Schockling ◽

J Loconsole ◽

R Schaefer ◽

...

Keyword(s):

Peracetic Acid ◽

Suspended Solids ◽

Bacterial Inactivation ◽

Combined Sewer Overflows ◽

Combined Sewer ◽

Sewer Overflows

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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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A STRATEGY FOR MONITORING THE IMPACTS OF COMBINED SEWER OVERFLOWS ON THE OHIO RIVER

Water Science & Technology ◽

10.2166/wst.1994.0018 ◽

1994 ◽

Vol 30 (1) ◽

pp. 167-175

Author(s):

Alan H. Vicory ◽

Peter A. Tennant

Keyword(s):

National Policy ◽

The United States ◽

Ohio River ◽

Combined Sewer Overflows ◽

Treatment Technology ◽

Design Storm ◽

Combined Sewer ◽

Sewer Overflows ◽

Definition Of ◽

And Control

With the attainment of secondary treatment by virtually all municipal discharges in the United States, control of water pollution from combined sewer overflows (CSOs) has assumed a high priority. Accordingly, a national strategy was issued in 1989 which, in 1993, was expanded into a national policy on CSO control. The national policy establishes as an objective the attainment of receiving water quality standards, rather than a design storm/treatment technology based approach. A significant percentage of the CSOs in the U.S. are located along the Ohio River. The states along the Ohio have decided to coordinate their CSO control efforts through the Ohio River Valley Water Sanitation Commission (ORSANCO). With the Commission assigned the responsibility of developing a monitoring approach which would allow the definition of CSO impacts on the Ohio, research by the Commission found that very little information existed on the monitoring and assessment of large rivers for the determination of CSO impacts. It was therefore necessary to develop a strategy for coordinated efforts by the states, the CSO dischargers, and ORSANCO to identify and apply appropriate monitoring approaches. A workshop was held in June 1993 to receive input from a variety of experts. Taking into account this input, a strategy has been developed which sets forth certain approaches and concepts to be considered in assessing CSO impacts. In addition, the strategy calls for frequent sharing of findings in order that the data collection efforts by the several agencies can be mutually supportive and lead to technically sound answers regarding CSO impacts and control needs.

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

Water Science & Technology ◽

10.2166/wst.1992.0572 ◽

1992 ◽

Vol 26 (5-6) ◽

pp. 1295-1304 ◽

Cited By ~ 1

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.

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