sewer system Articles
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Sedimentation dynamics in combined sewer systems
Sediments in combined sewers may negatively affect the performance of sewer systems and significantly promote the formation of hydrogen sulfide. To prevent this, German sewer systems are cleaned regularly but at high costs. In order to optimize the cleaning intervals, this study investigates how deposits build up and change over a defined period under constant conditions. The experiments were ...
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Economic analyses for optimizing the construction of separate sewer in a hybrid sewer system
Metropolitan Taipei located in north Taiwan uses a hybrid sewer system consisting of mostly separate sewer for the populated regions, and partly combined sewer for less populated regions. This study used the concept that Marginal Cost of Control (MCC) equals to Marginal Benefits of Control (MBC) to establish the method for studying the optimal household connection percentage, and the most ...
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Global sensitivity analysis of an in-sewer process model for the study of sulfide-induced corrosion of concrete
The presence of high concentrations of hydrogen sulfide in the sewer system can result in corrosion of the concrete sewer pipes. The formation and fate of hydrogen sulfide in the sewer system is governed by a complex system of biological, chemical and physical processes. Therefore, mechanistic models have been developed to describe the underlying processes. In this work, global sensitivity ...
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Different erosion characteristics of sediment deposits in combined and storm sewers
To investigate the different erosion patterns of sediments in combined and storm sewers, sediments from three separate sewer systems and two combined sewer systems in urban Shanghai were collected for the flushing experiments. These experiments were conducted with different consolidation periods and shear velocities. As the consolidation period increases, dissolved oxygen exhibits a positive ...
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The sewer system, an undervalued place, that we depend on every day
How Digitizing the Sewer supports Climate Change A good infrastructure, such as our sewer system, is essential for a vital, viable, sustainable and social development of a country’s economy. Not only does it play an important role in sanitation and disease prevention, but the sewer system also plays a crucial role in the sustainability of our planet and the future of our generations . Due ...
By KANDO
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Pilot Project - Water Services Corporation Malta
After the production of the first 3 systems in collaboration with FM environmental and the positive feedback we have obtianed, it was time to implement a completely new system which is production/export optimized for the local market. Silvercraft has been entrusted a very ambitious project to solve a current H2S issue in Malta which will serve as a base for the new Bio3T SCS, thanks to this ...
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An agent-based approach for generating virtual sewer systems
The application of artificial case studies is a well established technique in urban drainage to test measures, approaches or models. However, the preparation of a virtual case study for a sewer system is a tedious task. Several algorithms have been presented in the literature for an automatic generation of virtual sewer systems. Applying the approach of generating virtual cities by means of the ...
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Dropshaft cascades in urban drainage systems
Dropshaft cascades are typical elements of sewer systems in steep urban catchment basins. The design of a dropshaft cascade, which is generally addressed as an optimization problem, also needs to consider the subsequent effects induced on the flow by the different elements of the cascade. Experimental research has been performed at the hydraulic engineering laboratory of the University of ...
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Experimental investigation on the efficiency of a high side weir overflow
ABSTRACTMost of the overflow structures in Flanders are 'high side weir overflows'. For the design of these structures British guidelines are used. However, the design conditions for sewer systems in the U.K. differ from the Flemish design conditions. In Flanders, pressurised flow is in common use in the pipes of the sewer system. That is why tests have been carried out on a scale model of a high ...
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Simplifying impact of urban development on sewer systems
Linking urban development and urban drainage models is a more and more popular approach when impacts of pavement of urban areas on sewer system performance are evaluated. As such an approach is a difficult task, this is not a feasible procedure for everyday engineering practice. We propose an alternative method, based on a developed simple near-quadratic relationship, which directly translates ...
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CSO Control Facility, City of Hackensack, NJ
Hackensack is the seat of Bergen County in northeastern New Jersey, occupying 4.6 squaremiles. The population of Hackensack is approximately 43,000. Elevation is from three feet to 120 feet above sea level and from a number of locations one can see the New York City skyline, seven miles to the east. During wet weather conditions the sewer system diverted large volumes of untreated waste water to ...
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Vacuum sewerage systems – a solution for fast growing cities in developing countries?
Developed more than a century ago, the potential of vacuum sewerage systems remains underexploited. At the same time, the rapid urbanization in Asia brings about major challenges for municipal utilities. In this context, the GIZ (Deutsche Gesellschaft fuer Internationale Zusammenarbeit) project ‘Integrated Resource Management in Asian Cities: the Urban Nexus’ gives technical advice to ...
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The variation of volatile fatty acid compositions in sewer length, and its effect on the process design of biological nutrient removal
The potential of enhanced biological phosphorus removal (EBPR) in biological nutrient removal (BNR) systems critically depends on the availability and types of volatile fatty acids (VFAs) in sewage. Although the characteristics of VFAs in sewage are strongly related with the biochemical transformations in the sewer system, they have not been studied thoroughly in terms of BNR process design. We ...
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A simplified method for estimating chemical oxygen demand (COD) fractions
A simplified method is presented for estimating chemical oxygen demand (COD) fractions. Its effectiveness was assessed by comparing different values found in literature. This case study considered two main sanitary sewer collection systems in Bogotá, Colombia. The results showed important differences in COD fractions between the sewer collection systems and the reference data. The method ...
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Searching for storm water inflows in foul sewers using fibre-optic distributed temperature sensing
A major drawback of separate sewer systems is the occurrence of illicit connections: unintended sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul sewer system. The amount of unwanted storm water in foul sewer systems can be significant, resulting in a number of detrimental effects on ...
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Pre-Construction Monitoring - Case Study
Monitor baseline flows in stormwater and combined sewer systems pre-and post-green infrastructure ...
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A study of stormwater infiltration system feasibility and design
ABSTRACTThere are numerous reasons, such the saturation of the existing downstream sewer system or its concentrate discharge impact on the receiving water, for using stormwater infiltration systems. However, their feasibility within an urban development project depends on physical soil characteristics and contamination risk, and also on socio-economic considerations. The choice should be based on ...
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Development of a semi-automated model identification and calibration tool for conceptual modelling of sewer systems
Applications such as real-time control, uncertainty analysis and optimization require an extensive number of model iterations. Full hydrodynamic sewer models are not sufficient for these applications due to the excessive computation time. Simplifications are consequently required. A lumped conceptual modelling approach results in a much faster calculation. The process of identifying and ...
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Sewer system flow components identification using signal processing
The development of a continuous model to simulate the behaviour of sewer systems requires detailed information on each component of the flows contributing to the global discharge. In this paper authors investigate a novel method based on signal processing and long time series data implemented with a 2 min time step (flow rate, conductivity, pH and turbidity) in order to identify the dry weather ...
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Belfast city sewer case study
Client: NIWater CSG provided a number of valves to go in to the newly refurbished Belfast City Sewer. Originally installed during Victorian times the sewer system has been updated in order to reduce flood risks and improve the general infrastructure. The project comes at a cost of £120M and encompasses over 10km of pipeline. It has won a number of awards for innovation and is the largest ...
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