At Wolfsburg for a load of 100,000 p.e., the step-feed activated sludge process for nitrogen removal is successfully in operation. Due to the high denitrification potential (BOD:TKN = 5:1) the effluent total nitrogen content can be kept below 10 mg l−1 N; furthermore by some enhanced biological phosphate removal about 80% phosphorus may be removed without any chemicals.
Operational Results of the Wolfsburg Wastewater Treatment Plant
R. Kayser, G. Stobbe, M. Werner; Operational Results of the Wolfsburg Wastewater Treatment Plant. Water Sci Technol 1 February 1992; 25 (4-5): 203–209. doi: https://doi.org/10.2166/wst.1992.0496
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