Analysis on the linear relations about BOD5,DO and COD in the water of marine outfalls
The relations about BOD5,DO and COD were researched,which were acquired from water of marine outfalls near a coastal city,south China.The results indicated that preferable one-variable line-arity existed between COD and BOD5,but relatively weak linearity between BOD5 and DO,as weakly between DO and COD.A binary linear function was established to express the relation about the three parameters,with a better linear determination coefficient and a larger F-test value.When COD 100mg/L,the fitting degree of the binary linear function was better than the one-variable linear func-tion between COD and BOD5.Monitoring data of BOD5,DO and COD from water of marine outfalls of this city in 2015 year was used to verify the binary linear function.The relative error between COD val-ues fitted by the binary linear function and COD values detected in a lab,was less than 25％,which ac-corded with the precession of quality control criterion,and verified the binary linear function reliable.
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