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

1990 ◽  
Vol 22 (10-11) ◽  
pp. 61-68 ◽  
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.

Causal Stochastic Simulation of Dissolved Oxygen Depletion in Rivers Receiving Combined Sewer Overflows

1994 ◽  
Vol 29 (1-2) ◽  
pp. 191-198 ◽  
Author(s):  
K. Schaarup-Jensen ◽  
T. Hvitved-Jacobsen
Keyword(s):  
Dissolved Oxygen ◽  
Extreme Event ◽  
Oxygen Depletion ◽  
Model Parameters ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Combined Sewer ◽  
Model Mouse ◽  
Sewer Overflows ◽  
Runoff Model

A method for stochastic analysis of the effect of combined sewer overflows on the dissolved oxygen concentration in receiving rivers is developed. The method is based on repeated operation of the water quality model MOUSE-DOSMO. Each operation of this model covers a series of overflow events calculated by the MOUSE-SAMBA runoff model based on a historical rainfall record. For each event selected input data and model parameters in both models are drawn from fundamental statistical distributions by a simple Monte Carlo method. These data and parameters vary from event to event in each series. Each operation of the MOUSE-DOSMO model results in an extreme event statistics on dissolved oxygen minimum values -while repeated operation of the model yields extreme event percentiles by means of which a probability-based assessment of the model result may be performed.

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.

Modelling total suspended solids, E. coli and carbamazepine, a tracer of wastewater contamination from combined sewer overflows

2015 ◽  
Vol 531 ◽  
pp. 830-839 ◽  
Author(s):  
Khemngeun Pongmala ◽  
Laurène Autixier ◽  
Anne-Sophie Madoux-Humery ◽  
Musandji Fuamba ◽  
Martine Galarneau ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Total Suspended Solids ◽  
Combined Sewer Overflows ◽  
E Coli ◽  
Combined Sewer ◽  
Sewer Overflows

A Water Elutriation Apparatus for Measuring Settling Velocity Distribution of Suspended Solids in Combined Sewer Overflows

2004 ◽  
Vol 39 (4) ◽  
pp. 432-438 ◽  
Author(s):  
Bommanna G. Krishnappan ◽  
Jiri Marsalek ◽  
Kirsten Exall ◽  
Robert P. Stephens ◽  
Quintin Rochfort ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Suspended Solids ◽  
Settling Velocity ◽  
Settling Chamber ◽  
Combined Sewer Overflows ◽  
Polymer Addition ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
Settling Velocity Distribution ◽  
Chemical Distribution

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.

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

2017 ◽  
Vol 599-600 ◽  
pp. 533-539 ◽  
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

scholarly journals EmiStatR: A Simplified and Scalable Urban Water Quality Model for Simulation of Combined Sewer Overflows

Water ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 782 ◽  
Author(s):  
Jairo Torres-Matallana ◽  
Ulrich Leopold ◽  
Kai Klepiszewski ◽  
Gerard Heuvelink
Keyword(s):  
Water Quality ◽  
Water Quality Model ◽  
Urban Water ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Urban Water Quality ◽  
Combined Sewer ◽  
Sewer Overflows

scholarly journals Water Quality-Based Double-Gates Control Strategy for Combined Sewer Overflows Pollution Control

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 529
Author(s):  
Zhongqing Wei ◽  
Haidong Shangguan ◽  
Jiajun Zhan ◽  
Ruisheng Lin ◽  
Xiangfeng Huang ◽  
...  
Keyword(s):  
Water Quality ◽  
Control Strategy ◽  
Storage Tank ◽  
Stable Operation ◽  
Double Gate ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Traditional Scheme ◽  
Combined Sewer ◽  
Sewer Overflows

The combined sewer overflows (CSO) pollution has caused many serious environmental problems, which has aroused a worldwide concern. Traditional interception-storage measures, which exhibit the disadvantages of the larger storage tank volume and the low concentration, cannot efficiently control the CSO pollution. To solve this problem, a water quality-based double-gate control strategy based on the pollution based real-time control (PBRTC) rule was proposed, and the chemical oxygen demand (COD) concentration was taken as the control index. A case study was carried out in Fuzhou, China as an example, in which the hydraulic and water quality model were constructed to evaluate two schemes. According to the results, compared to the traditional scheme, the double-gate scheme can not only reduce the storage tank volume by 1515 m3, but also increase the average COD interception rate by 1.84 times, thus ensuring the effective and stable operation of the facility. Furthermore, the traditional scheme and the double-gate scheme were evaluated under design rainfall beyond the design return period, which confirmed the high performance of the double-gate scheme in controlling CSO pollution.

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