Plants need a practical solution that delivers continuous information on wastewater composition and quality to operations personnel. When results come back from the lab, the information is usually of little value for process control and improving plant performance. Relying on grab samples leads to significant delays. The amount of oxygen required is calculated from the quantity of chemical oxidant consumed. The sample is then digested for approximately 2 hours at 150☌.
Often, the test also involves a silver compound to encourage oxidation of certain organic compounds and mercury to reduce the interference from oxidation of chloride ions. LABORATORY DELAY FOR COD RESULTS LIMITS ACTIONĪ common method for Chemical Oxygen Demand analysis involves using a strong oxidizing chemical, potassium dichromate Cr 2O 7 2-, to oxidize the organic matter in solution to carbon dioxide and water under acidic conditions. UV Disinfection Performance and Optimization.
