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Infiltration of Combined Sewer Overflow and Tertiary Treated Municipal Wastewater: An Integrated Laboratory and Field Study on Various Metals

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The heavy metal load of combined sewer overflow (CSO) and its retention during CSO infiltration was studied in a comparative field and laboratory experiment during a 2-year period, with simultaneous study of tertiary treated municipal wastewater (TMW). The concentrations of aluminum, chromium, copper, iron, manganese, and zinc in CSO significantly exceeded those of TMW by factors ranging from 2 (manganese) to 12 (aluminum). Correlation analysis suggests that aluminum, barium, iron, lead, and zinc originate from urban runoff, while chromium and most alkali and alkaline earth elements are likely provided by municipal wastewater. As copper correlates with boron and zinc, raw wastewater and surface runoff may contribute to the elevated copper concentration in CSO. Laboratory column and field data indicate that analyzed metals were well retained during soil passage under the oxidizing conditions and that groundwater quality under CSO infiltration is comparable to TMW infiltration. Laboratory experiments show that nitrification and mineralization produce more acidity than CSO can neutralize. Thus, co-infiltration of TMW with CSO or the addition of carbonate minerals to the soil is recommended to prevent soil acidification and maintain its retention potential.
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Keywords: ACIDIFICATION; COMBINED SEWER OVERFLOW; HEAVY METALS; INFILTRATION; SOIL AQUIFER TREATMENT; TERTIARY TREATED MUNICIPAL WASTEWATER

Document Type: Research Article

Publication date: 2000-11-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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