COD$=3500$x$23=80500$mg$/$L

The organic biodegradation ratio $($BOD$5$

$/$COD$)$ is a measure of how bio$-$degrada

ble the organic matter in the wastewate

ris:

BOD$5$

$34500$

~$0\mathrm{.}428$

Ratio $=$

COD

$80500$

A BOD $5/$COD ratio higher than $0\mathrm{.}3$ gener

ally indicates that the wastewater is bio

degradable. Here, the ratio of approxima

tely $0\mathrm{.}428$ suggests that a significant am

ount of organic matter in the wastewate

r is biodegradable, but still requires exte

nsive treatment to reduce the pollutant

contents down to acceptable levels.