In the near future the WWTP Horstermeer will be confronted with more stringent requirements. Important factor in this respect is the European Water Framework Directive 2000/60/EC. Within the WFD approach the focus is more and more on low nitrogen (<2.2 mg N-total/L) and phosphorus concentrations (<0.15 mg P-total/L) in WWTP effluent. Therefore, research has been initiated at the Horstermeer WWTP to investigate the possibilities of simultaneous nutrient removal with filtration techniques. After nitrite accumulation, caused by phosphorus limitation, was measured in the filtrate water of the 1-STEP® filter, research has started. The objective of this research is to minimise the risk on the inhibition of denitrification by phosphorus limitation and to decrease the dosage of coagulant. Therefore a new coagulant dosage system is developed. The back-ground of the coagulant dosage system, the results and cost savings are discussed in this article. When the PO4-P/NOx-N ratio in the WWTP effluent becomes below 0.06 mg/mg phosphorus limitation may occur. The results for phosphorus and nitrogen removal are equal or improved compared to the yearly average of 2008. The results show a more stable removal process and a reduction of the coagulant dosage for the coagulant dosage system of 11% when compared to a continuous dosage ratio of MeP 4 mol/mol.
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Research Article|
October 01 2011
Minimising the risk on phosphorus limitation; an optimised coagulant dosage system
S. M. Scherrenberg;
1Department of Sanitary Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands
E-mail: s.m.scherrenberg@tudelft.nl
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H. W. H. Menkveld;
H. W. H. Menkveld
2Witteveen + Bos Consulting Engineers, P.O. Box 233, 7400 AE Deventer, The Netherlands
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M. Bechger;
M. Bechger
3Waternet, P.O. Box 94370, 1090 GJ Amsterdam, The Netherlands
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J. H. J. M. van der Graaf
J. H. J. M. van der Graaf
1Department of Sanitary Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands
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Water Sci Technol (2011) 64 (8): 1708–1715.
Article history
Received:
November 22 2010
Accepted:
December 15 2010
Citation
S. M. Scherrenberg, H. W. H. Menkveld, M. Bechger, J. H. J. M. van der Graaf; Minimising the risk on phosphorus limitation; an optimised coagulant dosage system. Water Sci Technol 1 October 2011; 64 (8): 1708–1715. doi: https://doi.org/10.2166/wst.2011.497
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