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.

Prédiction des débits de ruissellement pour le contrôle des réseaux d'égouts unitaires

1982 ◽  
Vol 9 (3) ◽  
pp. 537-548 ◽  
Author(s):  
Gilles Patry ◽  
Gilles Marchi ◽  
Jean Rousselle
Keyword(s):  
Regression Models ◽  
Urban Runoff ◽  
Point Sources ◽  
Combined Sewer Overflows ◽  
Water Users ◽  
Sources Of Pollution ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
Overflow Control ◽  
Runoff Model

As point sources of pollution are being eliminated others, less apparent, are becoming increasingly threatening to many water users. Non-point sources of pollution generated by combined sewer overflows have been found to be responsible for many of our water quality problems. The purpose of this paper is twofold: (a) to offer a summary of the combined sewer overflow control problem, and (b) to suggest a methodology for the anticipation or prediction of runoff flows from an urban catchment.Two types of regression models designed to predict urban runoff are presented and compared with the calibrated runoff model ILLUDAS. The simplicity of regression models and their ease of application to the real-time automatic control of combined sewer overflows make their use very promising.

Dissolved Oxygen Stream Model for Combined Sewer Overflows

1990 ◽  
Vol 22 (10-11) ◽  
pp. 137-146 ◽  
Author(s):  
K. Schaarup-Jensen ◽  
T. Hvitved-Jacobsen
Keyword(s):  
Dissolved Oxygen ◽  
Dispersion Model ◽  
Combined Sewer Overflows ◽  
Weather Effects ◽  
Combined Sewer ◽  
Wet Weather ◽  
Sewer Overflows ◽  
Weather Impacts ◽  
Advanced Model ◽  
Stream Model

Dissolved oxygen (DO) depletion in receiving streams during combined sewer overflows (CSO) is aphenomenon which comprises dry weather processes, including photosynthesis, and wet weather impacts. During a CSO event a distinction between immediate and delayed DO consumption in the stream caused by biodegradation of soluble and particulate organics, respectively, is made. Two DO models have been developed in order to simulate the combined dry weather and wet weather effects. The first one is a simplified model based on the concept of an extended Streeter-Phelps equation and the second one is an advanced model, which is made from two integrated parts a hydro dynamic and a transport-dispersion model. The structure of the two models is described and model results are compared and evaluated.

A software-based sensor for combined sewer overflows

2012 ◽  
Vol 66 (7) ◽  
pp. 1475-1482 ◽  
Author(s):  
G. Leonhardt ◽  
S. Fach ◽  
C. Engelhard ◽  
H. Kinzel ◽  
W. Rauch
Keyword(s):  
Water Level ◽  
Simulation Models ◽  
Rainfall Runoff ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Level Data ◽  
Water Level Data ◽  
Combined Sewer ◽  
Rainfall Runoff Model ◽  
Runoff Model

A new methodology for online estimation of excess flow from combined sewer overflow (CSO) structures based on simulation models is presented. If sufficient flow and water level data from the sewer system is available, no rainfall data are needed to run the model. An inverse rainfall-runoff model was developed to simulate net rainfall based on flow and water level data. Excess flow at all CSO structures in a catchment can then be simulated with a rainfall-runoff model. The method is applied to a case study and results show that the inverse rainfall-runoff model can be used instead of missing rain gauges. Online operation is ensured by software providing an interface to the SCADA-system of the operator and controlling the model. A water quality model could be included to simulate also pollutant concentrations in the excess flow.

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

Simulation of the Impact of Combined Sewer Overflow on Rivers

1984 ◽  
Vol 15 (4-5) ◽  
pp. 325-332
Author(s):  
Niels Bent Johansen ◽  
Thorkild Hvitved-Jacobsen ◽  
Poul Harremoës
Keyword(s):  
Small Rivers ◽  
Combined Sewer Overflows ◽  
Quality Model ◽  
Traditional Design ◽  
Operational Design ◽  
Combined Sewer ◽  
Critical Oxygen ◽  
The Impact ◽  
Independent Parameters ◽  
Runoff Model

Combined sewer overflows can in some cases cause critical oxygen concentrations in small rivers. The traditional design criteria for the overflow structures is not specificly related to this effect. By combination of a long historical rain series, a runoff model and a river quality model, it has been possible to achieve operational design diagrams for overflow structures. The diagrams are statistically based and relate the independent parameters for the catchment, the overflow structure and the river to the effect in question, the oxygen concentration.

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.

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.

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