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Chemical Oxygen Demand Treatment

Recently, the focus on chemical oxygen demand (COD) has increased for manufacturing operations, food processing plants, fish hatcheries, and a variety of other industries. Chemical Oxygen demand tests are rapid high frequency tests, that often produce results similar to the more time consuming biologicial oxygen demand test. COD, like BOD has become an increasingly important metric in evaluating the effeciency of your plant.

As mentioned earlier, COD evaluates all organic and inorganic material within your wastewater. In order to meet compliance standards these materials need to be significantly reduced to lower the amount of oxygen required for oxidation. If not properly addressed in your water treatment solution, higher levels of organic and/or inorganic solids can increase the oxygen required for oxidation and potentially prevent your plant from meeting comlpiance requirements. ALAR water treatment solutions provides you with cost effective wastewater equipment solutions that address your COD compliance needs.

Chemical Oxygen Demand (COD) represents the amount of oxygen needed to react or oxidize with all organic compounds, soluable and insolable, within a volume of wastewater. In practice, chemical oxygen demand is  expressed in milligrams per liter of water (mg/L).

Chemical or Biological Oxygen Demand? (BOD vs COD)

Often used together, COD and BOD both test similar things but are two very different tests and compliance metrics. The United States EPA approved the usage of COD for rapid frequent monitoring of treatment plant effeciency. Unlike BOD the COD test can be completed in just two hours. But where COD is most useful is that its results often correlate closely with BOD results. Also like BOD, COD is used exclusively for testing organic pollution within a volume of wastewater as the test does not messure any toxic materials in the sample.

Chemical Oxygen demand testing is also useful in evaluating the organic materials present in the water when compared with metrics like total organic carbon (TOC) which is a direct measurement of the carbon present in wastewater. For example, when the ratio of COD to TOC is high, it likely represents a large concentration of easily oxidized solids.

ALAR Water Treatment is a direct-manufacturer of chemical pretreatment systems, along with dissolved air flotation and biological treatment equipment. ALAR’s COD wastewater technology can integrate into an operation as a complete chemical oxygen demand treatment system or retrofit to existing machinery. ALAR provides access to a variety of cost effective solutions for commerial, industrial, or residential applications. Let ALAR help determine the best industrial wastewater process by guiding you through the steps to achieving your company’s water compliance initiatives.


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