Browsing Civil Engineering by Title
Now showing items 116-135 of 186
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National Centre for Water and Wastewater Research and Demonstration
(EPA: STRIVE Report 78, 2010)Decentralised wastewater treatment systems for small towns (200 2,000 PE) often have different design requirements to those of systems for larger conurbations even though the treatment process technologies may be similar. ... -
Nested circulation modelling of inter-tidal zones: details of a nesting approach incorporating moving boundaries
(2010)Nested circulation models developed to date either exclude the flooding and drying process or prohibit flooding and drying of nested boundaries; they are therefore ill-suited to the accurate modelling of inter-tidal areas. ... -
A nested hydrodynamic model incorporating flooding and drying
(2009)A one-way nested version of the hydrobiological model DIVAST (Depth Integrated Velocity and Solute Transport) is introduced. The nested model allows flooding and drying of intertidal areas, a process often present in areas ... -
A nested version of the combined hydrodynamic and water quality model, DIVAST
(2007)The present research deals with the development of a one-way nested version of the combined hydrodynamic and water quality model DIVAST (Depth Integrated Velocity and Solute Transport). Initial research has concentrated ... -
Nitrate removal rate, efficiency and pollution swapping potential of different organic carbon media in laboratory denitrification bioreactors.
(Ecological Engineering, 2012-01-01)Laboratory denitrifying bioreactors, which use an organic carbon (C) rich media to enhance microbial reduction of nitrate (NO3-) to nitrogen (N) gases, are used worldwide to protect surface and groundwater. To highlight ... -
Nitrification in a vertically moving biofilm system
(Elsevier, 2006-03)A laboratory continuous feed biofilm reactor, comprising a bulk fluid reactor, a biofilm plastic module, a feed tank, and pneumatic devices and controls, was operated for a total period of 257 days, including seeding time, ... -
Nitrification in a vertically moving biofilm system.
(Journal of Environmental Management, 2006-06-01)A laboratory continuous feed biofilm reactor, comprising a bulk fluid reactor, a biofilm plastic module, a feed tank, pneumatic devices and controls, was operated for a total period of 257 days, including seeding time, to ... -
Nitrogen-limitation-induced carbon and phosphorus fluxes in anaerobic/aerobic sequencing batch reactors
(Elseiver, 2010)Enhanced biological phosphorus removal (EBPR) has been applied widely in wastewater treatment plants. However, deterioration or failure of EBPR often happens because: (i) of the dominance of glycogen-accumulating organisms ... -
A novel hybrid filter for the treatment of septic tank effluent
(ASCE, 2006)Intermittent sand filtration is a common and effective method for treating septic tank effluent. However, if the loading rate is too high, clogging and ponding of the sand filter surface layer can occur due to the accumulation ... -
A novel hybrid filter for the treatment of septic tank effluent.
(ASCE Journal of Environmental Engineering, 2006-06-01)Intermittent sand filtration is a common and effective method for treating septic tank effluent. However, if the loading rate is too high, clogging and ponding of the sand filter surface layer can occur due to the accumulation ... -
Numerical model for steel brace members incorporating a fatigue model
(2013)The aim of this paper is to develop a robust numerical model for cold-formed steel square and rectangular structural hollow sections for use as axial loaded members in earthquake engineering applications. Pseudo-static ... -
Numerical modelling of pile foundation angular distortion
(Elsevier, 2015-05-16)In this paper, the PLAXIS 3-D Foundation finite element (FE) software package, in conjunction with the nonlinear Hardening Soil (HS) constitutive model, is employed in an extensive parametric study of the angular distortion ... -
Numerical modelling of the improvements to primary and creep settlements offered by granular columns
(Springer-Verlag, 2013)Analytical vibro-replacement design approaches typically quantify the settlement reduction using a dimensionless settlement improvement factor, defined as the ratio of the settlements without and with treatment. Most ... -
Numerical modelling to aid in the structural health monitoring of wave energy converters
(2013)A vital aspect of ensuring the cost effectiveness of wave energy converters (WECs) is being able to monitor their performance remotely through structural health monitoring, as these devices are deployed in very harsh ... -
Numerical simulation of linear water waves and wave-structure interaction
(2012)One of the main stages in the design of wave energy converters (WEC's) is the numerical modelling of a given converter. In this paper, the numerical simulation of both linear deep water waves and linear waves for the finite ... -
A numerical study of factors affecting the performance of stone columns supporting rigid footings on soft clay
(Taylor and Francis, 2010)The Vibro Replacement technique is now frequently used as a means of improving the bearing capacity and settlement performance of soft cohesive soils. In this paper, a parametric study using the finite element method is ... -
Nutrient dynamics in a peatland forest riparian buffer zone and implications for the establishment of planted saplings
(2012)Forestry on peatland throughout the world is now focused on minimising destructive effects to the surrounding environment, especially during harvesting. These effects may be mitigated through the use of well-developed ... -
Nutrient dynamics in a peatland forest riparian buffer zone and implications for the establishment of planted saplings.
(2012)Forestry on peatland throughout the world is now focused on minimising destructive effects to the surrounding environment, especially during harvesting. These effects may be mitigated through the use of well-developed ... -
Nutrient dynamics in Cork Harbour
(2005)Estuaries are commonly characterised by high productivity due to frequent if not continuous inputs of nutrients from domestic and industrial discharge effluents and from freshwater and marine sources. These forms of nutrient ... -
Nutrient, metal and microbial loss in surface runoff following treated sludge and dairy cattle slurry application to an Irish grassland soil
(Elsevier, 2015)Treated municipal sewage sludge ( biosolids ) and dairy cattle slurry (DCS) may be applied to agricultural land as an organic fertiliser. This study investigates losses of nutrients in runoff water (nitrogen (N) and ...