A protocol for the use of particle counting in stormwater suspended solids analysis

Paper


Shrestha, Roshani and Brodie, Ian. 2011. "A protocol for the use of particle counting in stormwater suspended solids analysis." Ramilo, Nicole (ed.) 2011 Stormwater Industry Association of Queensland State Conference: Achieving Multiple Outcomes - A Time to Reflect (SIA 2011) . Gold Coast, Australia 25 - 27 May 2011 Brisbane, Australia.
Paper/Presentation Title

A protocol for the use of particle counting in stormwater suspended solids analysis

Presentation TypePaper
AuthorsShrestha, Roshani (Author) and Brodie, Ian (Author)
EditorsRamilo, Nicole
Journal or Proceedings TitleProceedings of the 2011 Stormwater Industry Association of Queensland State Conference (SIA 2011)
Number of Pages21
Year2011
Place of PublicationBrisbane, Australia
Web Address (URL) of Paperhttp://www.gemsevents.com.au/SIAQ2011/conference_papers.shtml
Conference/Event2011 Stormwater Industry Association of Queensland State Conference: Achieving Multiple Outcomes - A Time to Reflect (SIA 2011)
Event Details
2011 Stormwater Industry Association of Queensland State Conference: Achieving Multiple Outcomes - A Time to Reflect (SIA 2011)
Event Date
25 to end of 27 May 2011
Event Location
Gold Coast, Australia
Abstract

Particle count technology that has been used for more than two decades in potable water testing is finding increasing application in stormwater as well. Particle count is a two-dimensional measurement of particle number by size, therefore it can potentially produce accurate and precise
information on water quality, system performance and stormwater treatment efficiencies compared to conventional TSS, SSC and turbidity measurement methods.
In this study, a protocol for using PAMAS S4031, a particle counter based on light obscuration has been developed. Most of the modern particle counter instruments currently being adapted for liquid analysis are designed with the narrow spectrum analytical requirement in mind (for example,counting blood cells and fuel spray droplets size) , so it should be noted that these instruments have limitations. In this paper, the limits and capabilities of available instrument technology will be
presented in detail to make the best use for analysing suspended particles in stormwater.
A silica powder LANG LANG SILICA 60G, obtained from highly pure sand with known particle size distribution (PSD) in term of percentage of mass and uniform density of 2.66 gm/cm3 was used for the verification of the particle counter. Initially two different methods, namely sieve analysis and settling column, were used to confirm the given PSD of silica. Wet and dry sieving were performed to fraction particles in the range between 45μm to 250 μm. Settling column analysis was used to fraction
particles larger than 2μm whereas the pipette method was used for smaller particles between 2 μm to
62.5 μm. The PSD obtained from these methods were compared with the given PSD. Based on particle density information, particle counts were calculated mathematically for given PSD and were compared with particle count obtained from PAMAS particle counter. It was found that although the
measurement range was between 1 to 100μm, the instrument was most effective in measuring particles smaller than 10 μm only.
The protocol will thus mainly focus on fine particles < 10μm. This study comprises of series of monitoring trials, conducted at different concentrations, flow rates, instrumental set ups etc. The protocol is expected to be fast and easy to use and can be used to evaluate stormwater quality and treatment performance. It can also assist in the selection of treatment systems on a more consistent
basis.

Keywordsparticle count; particle size distribution; stormwater
ANZSRC Field of Research 2020370704. Surface water hydrology
370509. Sedimentology
400513. Water resources engineering
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsFaculty of Engineering and Surveying
Department of Agricultural, Civil and Environmental Engineering
Institution of OriginUniversity of Southern Queensland
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