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

Paper analyses the influences of combined sewer overflows (CSO’s), on the receiving water quality, but generally deals also with various types of storm water management in urban areas. The first case study analyses the impacts of the continuous (wastewater treatment plant in the town Osijek) and discontinuous pollution sources (CSO’s in the town Osijek) on the quality of the receiving water – the Drava river (Croatia). The second modelling case study was performed on the river Hron (Slovak republic). In this study, the impacts on the water quality from combined sewer overflows form the biggest town on Hron River – Banská Bystrica were studied, as well as four feasible alternatives of storm sewer management (different mixing ratio, different size of storm tanks) were analysed. For both case studies, the mathematical simulation model MIKE11 (Danish Hydraulic Institute, DHI) was used.

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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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Ecological aspect in combined sewer overflows chamber design

Water Practice & Technology ◽

10.2166/wpt.2013.041 ◽

2013 ◽

Vol 8 (3-4) ◽

pp. 409-416

Author(s):

J. Pollert

Keyword(s):

Ecological Engineering ◽

Combined Sewer Overflows ◽

Reinforced Plastic ◽

Combined Sewer ◽

New Type ◽

Receiving Waters ◽

Sewer Overflows ◽

The Cost ◽

Floating Objects ◽

Receiving Water

In 2005 one of major Czech manufacturers of glass reinforced plastic pipes asked the Department of Sanitary and Ecological Engineering to develop a new type of combined sewer overflows (CSO) chamber that could become a part of their manufacturing programme. The main requirements were economy of production, easy and fast installation on the field and increased protection of receiving waters. A simple object consisting of a pipe placed above another one was designed. The object begins with a stilling chamber formed by a conical expansion of the inlet pipe. It is separated from the overflow object itself by a downflow baffle designed to trap floating objects. The CSO chamber is equipped by a flow regulation device (e.g. vortex valve or throttle pipe) at the end. Excess water flows through a slit in the top of the bottom pipe into the upper pipe and from there to the receiving water. More than 15 prototypes were already installed in the Czech and Slovak Republics and more than 20 are planned to be built in Europe. We hope this type of CSO CHAMBER will help to decrease the cost of construction of new sewers and reconstruction of old ones. Its higher efficiency of separation of suspended particles might also contribute to the improvement of the quality of receiving water bodies according to Water Framework Directive 2000/60/EC.

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