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

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

Water ◽

10.3390/w10060782 ◽

2018 ◽

Vol 10 (6) ◽

pp. 782 ◽

Cited By ~ 2

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

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River Water Quality Model no. 1 (RWQM1): Case study I. Compartmentalisation approach applied to oxygen balances in the River Lahn (Germany)

Water Science & Technology ◽

10.2166/wst.2001.0247 ◽

2001 ◽

Vol 43 (5) ◽

pp. 41-49 ◽

Cited By ~ 12

Author(s):

D. Borchardt ◽

P. Reichert

Keyword(s):

Water Quality ◽

Water Column ◽

River Water ◽

Water Quality Model ◽

River Water Quality ◽

Combined Sewer Overflows ◽

Quality Model ◽

Combined Sewer ◽

Sewer Overflows

A case study on the application of the River Water Quality Model No. 1 (RWQM1) is presented in order to illustrate the importance of modelling a sediment compartment for an ecologically meaningful assessment of the impact of wastewater effluents and combined sewer overflows. The focus of this case study is on the compartmentalisation approach of the RWQM1 that makes such a description possible. In contrast to this, a strongly simplified biochemical submodel is used that considers only oxygen and dissolved substrate. The object of the case study is the River Lahn, a moderately polluted 5th order stream in Germany, for which the connectivity of surface/subsurface flows and mass fluxes within river sediments have been intensively investigated. The hyporheic flow between a downwelling and upwelling zone of a riffle-pool sequence has been studied with the aid of tracer experiments and continuous records of water constituents. High diurnal fluctuations of oxygen travelled to considerable depth of the sediment and oxygen in the interstitial water decreased considerably while travelling through the riffle. Starting with the implementation of a strongly simplified version of the biochemical part of the RWQM1, but with the consideration of a sediment pore water compartment in addition to the water column compartment, a calibration procedure is performed using tracer data from the water column and the sediment. The calibrated model is then used to study the system response to wastewater treatment plant effluent and combined sewer overflow emissions. The modelling approach makes it possible to quantify the sediment oxygen demand and the spatial and temporal extent of sediment zones with oxygen depletion. However, the spatially averaged approach does not account for inhomogeneities in the sediment. It is shown that for this river with its alluvial coarse sediments even moderate emissions from sewerage systems may be high enough to drop sediment oxygen concentrations to low levels while those in the surface flow remain close to saturation. Similarly, it is demonstrated that combined sewer overflows may cause anoxic sediment oxygen conditions for extended time periods. The implications for ecologically sound river water quality modelling and for specific quality objectives are discussed.

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Hydrodynamic modelling of the influence of stormwater and combined sewer overflows on receiving water quality: Benzo(a)pyrene and copper risks to recreational water

Journal of Environmental Management ◽

10.1016/j.jenvman.2017.11.014 ◽

2018 ◽

Vol 207 ◽

pp. 32-42 ◽

Cited By ~ 6

Author(s):

Karin Björklund ◽

Mia Bondelind ◽

Anna Karlsson ◽

Dick Karlsson ◽

Ekaterina Sokolova

Keyword(s):

Water Quality ◽

Recreational Water ◽

Hydrodynamic Modelling ◽

Combined Sewer Overflows ◽

Combined Sewer ◽

Sewer Overflows ◽

Receiving Water

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Toxicity and pollutant impact analysis in an urban river due to combined sewer overflows loads

Water Science & Technology ◽

10.2166/wst.2010.809 ◽

2010 ◽

Vol 61 (1) ◽

pp. 207-215 ◽

Cited By ~ 20

Author(s):

A. Casadio ◽

M. Maglionico ◽

A. Bolognesi ◽

S. Artina

Keyword(s):

Water Quality ◽

Impact Analysis ◽

Waste Water Treatment ◽

Treatment Plant ◽

Quality Data ◽

Waste Water Treatment Plant ◽

Combined Sewer Overflows ◽

Water Quality Data ◽

Combined Sewer ◽

Sewer Overflows

The Navile Channel (Bologna, Italy) is an ancient artificial water course derived from the Reno river. It is the main receiving water body for the urban catchment of Bologna sewer systems and also for the Waste Water Treatment Plant (WWTP) main outlet. The aim of this work is to evaluate the Combined Sewer Overflows (CSOs) impact on Navile Channel's water quality. In order to collect Navile flow and water quality data in both dry and wet weather conditions, two measuring and sampling stations were installed, right upstream and downstream the WWTP outflow. The study shows that even in case of low intensity rain events, CSOs have a significant effect on both water quantity and quality, spilling a considerable amount of pollutants into the Navile Channel and presenting also acute toxicity effects. The collected data shown a good correlations between the concentrations of TSS and of chemical compounds analyzed, suggesting that the most part of such substances is attached to suspended solids. Resulting toxicity values are fairly high in both measuring points and seem to confirm synergistic interactions between heavy metals.

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Effects of wastewater and combined sewer overflows on water quality in the Blue River basin, Kansas City, Missouri and Kansas, July 1998-October 2000

10.3133/wri024107 ◽

2002 ◽

Cited By ~ 1

Keyword(s):

Water Quality ◽

River Basin ◽

Kansas City ◽

Combined Sewer Overflows ◽

Combined Sewer ◽

Sewer Overflows

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

Water Science & Technology ◽

10.2166/wst.1994.0665 ◽

1994 ◽

Vol 29 (1-2) ◽

pp. 191-198 ◽

Cited By ~ 4

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.

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Emission-immission based design of combined sewer overflows and treatment plant - the dresden case study

Water Science & Technology ◽

10.2166/wst.1997.0692 ◽

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.

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