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Published online 9 August 2005
Published in J Environ Qual 34:1591-1599 (2005)
DOI: 10.2134/jeq2004.0293
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Transport and Metabolic Fate of Sewage Particles in a Recipient Stream

Andrea Rautera, Gabriele Weigelhofera, Johann Waringera and Tom J. Battinb,*

a Dep. of Freshwater Ecology, Vienna Ecology Center, Univ. of Vienna, A-1090 Vienna, Austria
b Dep. of Freshwater Ecology, Vienna Ecology Center, Univ. of Vienna, A-1090 Vienna, Austria, and Dep. of Ecology, Univ. of Barcelona, 08082 Barcelona, Spain



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Fig. 1. Location of the study site in Austria, wastewater treatment plant (WWTP), SDPOM injection and sampling sites, and installation of the minipiezometers along the reference, deposition, and post-deposition subreaches. Each dot represents minipiezometers nested at 10, 35 cm and in some sites at 50 cm (stream width fivefold).

 


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Fig. 2. Relative loss (%) of fluorescent SDPOM from the streamwater with distance from the injection point. Each point was derived from triplicate samples at plateau conditions (see text). Symbols refer to 9 July 2003 ({blacksquare}), 31 July 2003 ({square}), and 2 Sept. 2003 ({circ}).

 


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Fig. 3. Distribution of vertical hydraulic gradients (VHG, a and b) and permeability (c and d) along the study reach. The shaded bar indicates the deposition subreach, preceded by the reference and followed by the post-deposition reach. Symbols indicate mean ± standard deviation from of two to three replicate minipiezometric measurements, and refer to 9 July 2003 ({blacksquare}), 31 July 2003 ({square}), and 2 Sept. 2003 ({circ}).

 


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Fig. 4. Spatial distribution of conductivity (a), temperature (b) and dissolved oxygen (c) along the study reach. Streamwater ({blacksquare}), 10-cm ({square}) and 35-cm porewater ({circ}). Symbols indicate the mean ± standard deviation of two to three replicate minipiezometric measurements.

 


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Fig. 5. Relationship between observed and predicted dissolved oxygen concentrations as derived from the end-member mixing analysis. The line denotes the 1:1 cases were the model predictions fit the observed concentrations. Values under the line indicate oxygen removal. Symbols refer to the reference ({square}), deposition ({circ}), and post-deposition ({blacksquare}) subreaches.

 





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