At many large wastewater treatment plants (WWTPs) the increased hydraulic load, caused by combined sewer systems during storm events, results in primary effluent overflow when the capacity of further treatment is exceeded. Due to stringent effluent standards, regulating the total discharge from the WWTPs, the Rya WWTP in Göteborg and the Sjölunda WWTP in Malmö will have to reduce the impact of primary effluent overflow. Separate, high rate, precipitation processes operated only during high flow conditions have been investigated in pilot units at the two WWTPs. Precipitation in existing primary settlers operated at a surface loading of 3.75 m/h removed phosphorus to 0.35 mg/l. The Actiflo process was also shown to remove suspended solids and phosphorus well. BOD was reduced by 50-60%. With such processes the overall effluent concentrations from the plants can be reduced significantly. Key upgrading features are small footprints, short start up time and high efficiency.
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Research Article|
October 01 2004
Reducing the total discharge from a large WWTP by separate treatment of primary effluent overflow
N. Hanner;
N. Hanner
*MALMÖ Water and Sewage Works, SE-205 80 Malmö, Sweden
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A. Mattsson;
A. Mattsson
**Gryaab, Karl IX:s väg, SE - 418 34 Göteborg, Sweden
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C. Gruvberger;
C. Gruvberger
*MALMÖ Water and Sewage Works, SE-205 80 Malmö, Sweden
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U. Nyberg;
U. Nyberg
*MALMÖ Water and Sewage Works, SE-205 80 Malmö, Sweden
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H. Aspegren;
H. Aspegren
*MALMÖ Water and Sewage Works, SE-205 80 Malmö, Sweden
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O. Fredriksson;
O. Fredriksson
**Gryaab, Karl IX:s väg, SE - 418 34 Göteborg, Sweden
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A. Nordqvist;
A. Nordqvist
**Gryaab, Karl IX:s väg, SE - 418 34 Göteborg, Sweden
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B. Andersson
B. Andersson
*MALMÖ Water and Sewage Works, SE-205 80 Malmö, Sweden
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Water Sci Technol (2004) 50 (7): 157–162.
Citation
N. Hanner, A. Mattsson, C. Gruvberger, U. Nyberg, H. Aspegren, O. Fredriksson, A. Nordqvist, B. Andersson; Reducing the total discharge from a large WWTP by separate treatment of primary effluent overflow. Water Sci Technol 1 October 2004; 50 (7): 157–162. doi: https://doi.org/10.2166/wst.2004.0444
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