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Title: The performance of stormwater treatment devices and methods for measuring maintenance requirements
Author: Mahoney, Matthew F.
ISNI:       0000 0004 7970 2362
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2018
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With the UK urban based population growing, and separate drainage systems increasingly utilised, surface water bodies will become increasingly polluted by urban stormwater run-off. The Up-Flo® Filter System is a stormwater treatment device designed by Hydro International Ltd, which utilises sedimentation and filtration. This EngD project was formed to understand the systems performance and to optimise its maintenance, whilst also developing knowledge about porous media, including its use as a filter media and sound propagation through it. A bespoke made rig containing the Up-Flo® Filter System was constructed. Numerous experiments were conducted, with measurements of; filter media permeability, sediment removal efficiency and sediment particle size. Additionally, bench scale and in-situ experiments were conducted to assess acoustic and conductance techniques to develop a filter media monitoring system. Full scale rig experiments provided in-depth information regarding the Up-Flo® Filter System's removal mechanisms. A key finding was that the filter media's permeability experiences a long term decline due to stratification, reducing the maximum treatment capacity of the system. This stratification effect was found to be a greater impact on permeability than typical sediment capture. Additionally, recommendations are made to optimise the performance and maintenance routines. Acoustic sensor development suffered from low signal-to-noise issues identified in the bench scale experiments. However, measured attenuation in deaired samples were similar to previously published data. The effect of sediment caused greater attenuation than observed in clean media samples. This, and the in-situ experimental results, show acoustics is a possible technique for monitoring, but requires work to overcome the air effects within the filter media. Additionally, in-situ testing of a bespoke made novel multi-probe conductance device found it was capable of monitoring flow rate through the media, water level, saturation, and permeability.
Supervisor: Tait, Simon ; Horoshenkov, Kirill ; Nichols, Andrew Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available