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

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

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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.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author retains copyright. Paper version made available on ePrints is the version as published on Conference website. http://www.gemsevents.com.au/SIAQ2011/conference_papers.shtml
Depositing User: Ms Roshani Shrestha
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 23 May 2012 05:48
Last Modified: 30 Jun 2014 02:38
Uncontrolled Keywords: particle count; particle size distribution; stormwater
Fields of Research (FOR2008): 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology
04 Earth Sciences > 0403 Geology > 040310 Sedimentology
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management
URI: http://eprints.usq.edu.au/id/eprint/20132

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