Sampling for representative micropollutant loads in sewer systems

Ort, C. and Gujer, W. (2006) Sampling for representative micropollutant loads in sewer systems. Water Science And Technology, 54 6-7: 169-176. doi:10.2166/wst.2006.591

Author Ort, C.
Gujer, W.
Title Sampling for representative micropollutant loads in sewer systems
Journal name Water Science And Technology   Check publisher's open access policy
ISSN 0273-1223
Publication date 2006-01-01
Year available 2006
Sub-type Article (original research)
DOI 10.2166/wst.2006.591
Volume 54
Issue 6-7
Start page 169
End page 176
Total pages 8
Place of publication London, United Kingdom
Publisher IWA Publishing
Language eng
Subject 090702 Environmental Engineering Modelling
Abstract Most commercially available auto-sampling devices do not support a continuous flow-proportional sampling mode, which would conceptually be the best for collecting representative composite samples. Instead different discrete sampling modes are available. Household chemicals can show considerable random short-term variations. With the anticorrosive benzotriazole, relating to a middle-frequent household activity, we show that, besides an accurate flow meter, mainly three factors are decisive for the representativeness of a substance's average load: the substance's load pattern, the sampling frequency and the length of the composite sample. When the sampling intervals are 10 minutes or longer, errors in the order of ±40% (standard deviation) or more have to be accepted, if the substance of interest is contained in a low number of wastewater pulses (i.e. the level of household activity). This particularly holds true for specific pharmaceuticals e.g. carbamazepine. Ammonium would be less critical, because it relates to a larger number of sources in the same catchment.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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Created: Wed, 21 Jan 2009, 01:29:00 EST by Maryanne Watson on behalf of Advanced Water Management Centre