sewer system Articles
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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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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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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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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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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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Pre-Construction Monitoring - Case Study
Monitor baseline flows in stormwater and combined sewer systems pre-and post-green infrastructure ...
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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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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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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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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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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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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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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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Estimating inflow to a combined sewer overflow structure with storage tank in real time: evaluation of different approaches
The performance assessment of storage tanks and combined sewer overflow (CSO) structures in sewer systems requires knowledge of the total inflow from the catchment during rainfall events. Many structures are, however, only equipped with sensors to measure water level and/or outflows. Based on the geometry of the tank, expressed as a level-storage relationship, inflow can be calculated from ...
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An approximate solution for two-dimensional groundwater infiltration in sewer systems
Estimating groundwater infiltration into sewer systems is important for wastewater treatment operators and municipalities. This paper presents an approximate solution for steady-state groundwater infiltration into sewer systems through line defects. The groundwater table was assumed to be horizontal and the aquifer homogeneous and isotropic. Mobius transformation technique and equivalent ...
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Sacramento State – upgrading sewer to “green”
Tidelands Construction Company installed a new Flowtite Septic Tank on the campus of California State University in Sacramento. This upgraded sewer system was part of a school-wide “green” building initiative. The governing body at one of California’s finest universities began a large-scale “green building” project designed to reduce the school’s harmful ...
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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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Integration of transfer function model and back propagation neural network for forecasting storm sewer flow in Taipei metropolis
Typhoons and storms have often brought heavy rainfalls and induced floods that have frequently caused severe damage and loss of life in Taiwan. Our ability to predict sewer discharge and forecast floods in advance during storm seasons plays an important role in flood warning and flood hazard mitigation. In this paper, we develop an integrated model (TFMBPN) for forecasting sewer discharge that ...
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Groundwater intrusion into leaky sewer systems
Vast volumes of groundwater are drained by urban sewer systems. This unwanted flow component intrudes into sewer systems through leaky joints or connected house drains. However, unlike urban storm drainage, it has a high seasonal variation corresponding to groundwater storage and long slow recessions similar to baseflow in rivers also fed by shallow groundwater exfiltrating into the surface ...
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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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