Combined Sewer Overflow Management
DocumentsDate added
Authors
Professor Robert Y.G. Andoh
Abstract
The conventional approach to the rehabilitation and improvement of collection system service levels has been to enhance system capacity and transfer increased flows to central wastewater treatment facilities, which in turn often results in the need for upgrading the treatment works to handle increased flows. The paper highlights why the implementation of satellite treatment systems within the collection systems (away from end of pipe) provides significant benefits from both a process and public health standpoint compared with the conventional approach.
Aspects of wastewater characterization, in particular settling velocity distributions, and its relevance on the performance of physical unit processes such as sedimentation and filtration are described and used to explain why satellite treatment makes sense. The satellite CSO treatment facilities at Columbus, Georgia which have undergone more than 5 years of peer reviewed intensive monitoring are described and used as a case example to highlight the benefits and significant cost savings that accrue from implementing satellite treatment systems within collection systems.
Authors
Use of computational fluid dynamics to assess the disinfection performance of a sewer overflowhot!
08/22/2005
Authors
D.A. Egarr, M.G. Faram, I. Guymer, T. O’Doherty, N.Syred
Abstract
The fluid residence time characterisation of a 3.4m diameter Hydrodynamic Vortex Separator (HDVS) has been carried out over a range of flowrates. Computational Fluid Dynamic (CFD) modelling has also been undertaken for the same conditions and validated against the experimental results, for which reasonable correspondence has been found. Using the results from the CFD modelling and batch inactivation results from the disinfection of secondary treated wastewater, it is shown that the theoretical performance of a HDVS as a contact vessel for disinfection can be predicted.
Authors
Robert Y.G. Andoh,Michael G. Faram and Kwabena Osei
Abstract
Globally, the water and wastewater industry faces major challenges, both in developed and developing world regions. The developed world has enjoyed the benefits of the foresight of prior generations, with major strides gained in public health simply from innovations such as the humble sewer which has contributed more to human health than all developments in the medical field. Challenges faced in different regions are diverse in nature, magnitude and scale. Some are local in nature but others such as the impacts of Climate Change are truly global. The paper examines the status and evolution of innovations within urban water management (with particular reference to stormwater management) including impacts of regulation, barriers to innovation, current trends and paradigms. It is argued that there is a need to change the way we approach urban water management challenges, particular if the goal is to achieve more sustainable development in an increasingly urbanizing world.
Perspectives of different parties involved in the selection of capital equipment for seweragehot!
06/16/2007
Authors
M. G. Faram, J. M. Saker & V. M. Story
Abstract
This paper presents a study of UK water industry capital equipment selection, focusing in particular on behaviour in relation to sewerage/combined sewer overflow (CSO) and wastewater-associated investment activities. Valuable new insights into the perspectives of different parties, including water service providers (WSPs), design consultants and construction companies, are provided. Through analysis of over 200 questionnaires, equipment selection is confirmed to be multi-organisational, with different parties dominating different roles. Among the selection criteria, service and quality are found to be valued as parameters worth paying for. Relationships and sustainability considerations are also found to be important, although views on whether sustainability benefits will be paid for are divided. While interparty alignment of views is generally good, there are occasional discrepancies at the individual water region level. It is suggested that optimisation might derive from recognising the significance of intangible components of the supplier offering, and managing relationships to allow these to be capitalised upon.
