Characterization and Advanced Treatment of Urban Stormwater from a Separate System

  • Bernd Heinzmann
Conference paper

Abstract

New investigations have shown that stormwater from a separate sewer system is an important pollution factor. The concentration of several parameters is higher than in the treated wastewater and partially exceeds the minimum requirements concerning wastewater discharge into the receiving waters. The load of several parameters in stormwater is equal to wastewater both in the investigated drainage area as well as in the western part of Berlin. With the upgrading of the wastewater treatment plants in Berlin, the significance of stormwater as a factor for the load of receiving waters increases. Therefore it is important to ensure a good treatment of the stormwater. The preliminary tests have shown that for coagulation and flocculation of the very weakly buffered and very soft stormwater, polyaluminium chloride (with a share of cationic flocculant aid), which reacts less acidic, is especially suitable. The optimum dose is 0.06 mmol/l Al3+, whereby the pH value has never fallen below 6. In the pilot plant investigations it was possible to work with this constant dose of polyaluminium chloride because the pH value and the acid capacity during the stormwater flow remained relatively unchanged. The best advanced stormwater treatment process is coagulation and flocculation in a pipe designed for both microfloc and macrofloc formation and for separation by filtration. In this case, in particular phosphate, organic compounds, filterable solids and anthropogenic substances, e.g. lead (a high portion of which comes into receiving waters in Berlin by stormwater) and copper could be removed. These results indicate that, in general, this process functions more efficiently than a stormwater tank where particles can only settle.

Keywords

Zinc Phosphorus Filtration Sedimentation Sewage 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1994

Authors and Affiliations

  • Bernd Heinzmann
    • 1
  1. 1.Berliner Wasser BetriebeBerlinGermany

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