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Transport and Metabolic Fate of Sewage Particles in a Recipient Stream

^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

View larger version (30K): [in a new window]   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).

View larger version (32K): [in a new window]   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 (), 31 July 2003 (), and 2 Sept. 2003 ().

View larger version (26K): [in a new window]   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 (), 31 July 2003 (), and 2 Sept. 2003 ().

View larger version (31K): [in a new window]   Fig. 4. Spatial distribution of conductivity (a), temperature (b) and dissolved oxygen (c) along the study reach. Streamwater (), 10-cm () and 35-cm porewater (). Symbols indicate the mean ± standard deviation of two to three replicate minipiezometric measurements.

View larger version (25K): [in a new window]   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 (), deposition (), and post-deposition () subreaches.