Another PeCOD project at a facility located in Quebec, Canada, focuses on improving the sustainability of the forestry industry by monitoring effluent wastewater produced by the pulp and paper industry. The traditional dichromate method has historically been used to monitor COD levels for this purpose. However, due to PeCOD’s analysis speed and environmentally friendly nature, mills can optimize their processes and improve the health and safety of their staff in a safe and timely manner. Validation studies for the peCOD COD method are important for reporting purposes, as the traditional dichromate method is the industry standard for COD analysis. The facility in Quebec is utilizing the PeCOD analyzer to test a range of effluent samples produced by an onsite mini-pilot plant, in addition to samples from established pulp and paper mills. Figure 2 represents effluent wastewater samples measured for COD by both the peCOD and the dichromate method. A strong correlation is observed between peCOD COD and dichromate COD (R 2 = 0.9956). This correlation indicates that the PeCOD technology is suitable for use in the pulp and paper industry as it is a reliable predictor of the regulated dichromate method for COD.
Figure 2: A linear regression of PeCOD ® COD Analyzer results vs Dichromate COD results. A strong correlation is observed shown by an R 2 value of 0.9956. The PeCOD analyzer uses nanotechnology encompassing titanium dioxide, a powerful oxidizer with a higher oxidizing potential than dichromate. The results shown above support this fact, as peCOD COD measured slightly higher than dichromate for each of the samples. It is important to note that sample preparation for COD measurement by both peCOD and dichromate made use of a 35uM filter to remove any solid particulates from analysis and is thus a measure of soluble COD.
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