Abstract
This paper presents a method of classifying specific aquatic borne organic materials according to degradability. Laboratory procedures and rationale are given for the development of a parameter referred to as the Refractory Index (R.I.). Examples of refractory index values and significance are offered. Representative data are below for which there is roughly a 13% relative error for each R.I. value. Materials characterized as refractory (having a low R.I. value) are persistent for the conditions stipulated in the ultimate BOD test and therefore low R.I. indicates persistence in the water environment. Materials having low R.I. values should not be discharged in receiving waters unless extensive examinations show that the material can be effectively removed by treatment or does not cause harmful effects in the aquatic environment.
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