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Water Science & Technology Vol 65 No 12 pp 2148–2153 © IWA Publishing 2012 doi:10.2166/wst.2012.125 Dynamic mass balancing for wastewater treatment data quality control using CUSUM chartsA. Spindler and P. A. VanrolleghemInstitute of Water Quality and Resource Management, Vienna University of Technology, Karlsplatz 13/226-1, 1040 Wien, Austria E-mail: a.spi@iwag.tuwien.ac.atmodel ABSTRACT Mass balancing is a widely used tool for data quality control in wastewater treatment. It can effectively detect systematic errors in data. To overcome the limitations of the mean balancing error as a measure of data quality, a well established method for statistical process control (the CUSUM chart) is adopted for application on the error vector of balancing data. Two examples show how time periods with stable low mass balancing errors can be detected by the method. The detectability of such time periods depends on the variability of the balancing error which is an important measure for the precision of the data. Keywords: data quality control; fault detection; mass balancing; statistical process control eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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