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Hach COD—Treating Brewery Process Water On Site
January 30, 2009
•Article: Hach COD—Treating Brewery Process Water On Site
By Mandy Miller
Although high organic loadings are ideal for anaerobic digestion and the subsequent production of methane for fuel, it demands continuous water analysis to monitor the treatment process and aid in process control. The major aim of the testing is to measure chemical oxygen demand (COD) and other parameters at scheduled intervals to provide a means to quantify waste strength variability to assist with the brewery's aggressive process water treatment and waste minimization efforts.
The quality and quantity of process water effluent entering the on-site treatment plant can fluctuate significantly, depending upon the different processes that are taking place within the brewery. Because the five-day incubation period for BOD analysis makes this test too slow to provide timely information for process control purposes, the in-house lab runs scheduled COD analysis at all effluent outlet flumes throughout the brewery. Because COD test results can be obtained in about two hours instead of five days, it gives the brewery a more timely analysis of loadings entering and leaving the treatment plant and provides a timely indication of plant performance, thereby permitting closer process control.
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