Emissions of pollutant loads from combined sewer systems and ...

11 th International Conference on Urban Drainage, Edinburgh, Scotland, UK, 2008
CONCLUSIONS
In conclusion, a general answer, which sewer system emits higher pollution loads is not
possible. It is extremely dependent from the considered substance with its specific properties
and resulting behaviour in the sewer systems. Therefore it is necessary to define
representative decisive criteria for receiving water impairment including a definition of the
relevant substance parameters.
Results of the pollution load simulation for the combined sewer system show that emissions
from CSOs are significant for certain substance parameters. This finding applies especially to
contaminants that are removed efficiently WWTP, such as estradiol. In this cases reduction
measures should consider discharges out of the WWTP and the CSO.
Nonetheless, is important to extend the data base on the amount of substances, especially
organic pollutants in order to verify these first calculated results. These measurements are
strongly recommended for the combined sewer system and for the CSOs in particular. Beside
of the introduced substances further compounds (e.g. surfactants, other substances out of
personal care products, further pharmaceuticals, herbicides, flame retardants) should be taken
into account.
REFERENCES
ATV-DVWK IG-5.4 (2002). Endokrin wirksame Substanzen in Kläranlagen – Vorkommen, Verbleib und
Wirkung. (Endocrine disruptors in waste water treatment plants – occurrence, distribution and effects).
Working document of the working group IG-5.4 from the German Water Association, DWA, Hennef,
Germany.
Birkett, J.W.; Lester, J.N. (2003). Endocrine Disruptors in Wastewater and Sludge Treatment Processes. Lewis
Publishers, CRC Press, Florida, USA.
Brombach, H.; Weiss, G.; Fuchs, S. (2005). A new database on urban runoff pollution: comparison of separate
and combined sewer systems. Wat. Sci. Tech., 51, (2), 119-128.
Clara, M.; Strenn, B.; Gans, O.; Martinez, E.; Kreuzinger, N.; Kroiss, H. (2005). Removal of selected
pharmaceuticals, fragrances and endocrine disrupting compounds in a membrane bioreactor and
conventional wastewater treatment plants. Water Research, 39, (19), 4,797-4,807.
EC (European Commission) (2006). Proposal for a directive of the European parliament and of the council on
environmental quality standards in the field of water policy and amending directive 2000/60/EC.
Gross, B; Montgomery-Brown, J; Naumann, A; Reinhard, M (2004). Occurrence and fate of pharmaceuticals
and alkylphenol ethoxylate metabolites in an effluent-dominated river and wetland. Environmental
Toxicology and Chemistry, 23, (9), 2,074-2,083.
Heberer, T. (2002). Occurrence, fate, and removal of pharmaceutical residues in the aquatic environment, a
review of recent research data. Toxicology Letters, 131, 5-17.
House, M.A.; Ellis, J.B.; Herricks, E.E.; Hvitved-Jacobsen, T.; Seager, J.; Lijklema, L.; Aalderink, H.; Clifforde,
I.T. (1993). Urban drainage - impacts on receiving water quality. Wat. Sci. Tech., 27, (12), 117-158.
Irmer, H. (2006). Chemische Gewässerindikatoren – Prioritäre Stoffe – Defizite – Handlungsbedarf (quality
indicators of receiving waters – priority substances – deficits – measures). Workshop of the Federal
Environment Agency on the Water Framework Directive held in May 2006 in Berlin, Germany.
Johnson, A.C.; Aerni, H.-R.; Gerritsen, A.; Gibert, M.; Giger, W.; Hylland, K.; Jürgens, M.; Nakari, T.;
Pickering, A.; Suter, M.J.-F.; Svenson, A.; Wettstein, F.E. (2005). Comparing steroid estrogen, and
nonylphenol content across a range of European sewage plants with different treatment and
management practices. Water Research, 39, (1), 47-58.
Joss, A.; Zabczynski, S.; Göbel, A.; Hoffmann, B.; Löffler, D.; McArdell, C.S.; Ternes, T.; Thomson, A.;
Siegrist, H. (2006). Biological degradation of pharmaceuticals in municipal wastewater treatment:
proposing a classification scheme. Water Research, 40, (8), 1,686-1,696.
Makepeace, D.K.; Smith, D.W.; Stanley, S.J. (1995). Urban stormwater quality: Summary of contaminant data.
Critical Reviews in Environmental Science and Technology, 25, (2), 93-139.
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