Two ecosystem were studied and it was observed that ecosystem A had very high value of COD whereas ecosystem B had low value if COD. What can you infer from this observation about the ecosystem?
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COD is often used as a measurement of pollutants in water, wastewater, and aqueous hazardous wastes. One application of the COD test is to measure soluble COD in wastewater, since characterization of total COD in wastewater is critical for accurate modeling of biotransformation in wastewater treatment processes.
Another application is to rapidly infer biodegradability of samples from the COD tests. This is commonly accomplished by establishing a correlation between COD and BOD. This method has been found successful when the proportions and types of materials in a wastewater remain relatively constant. For example, BOD in domestic wastewater samples from 5-day BOD tests can be approximated as BOD5=0.476 COD.
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