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A simple algorithm for on‐line prediction of BOD5 by a microprocessor‐based system

A novel algorithm for predicting BOD5 from the dissolved oxygen (DO) concentration after a relatively short incubation period is presented and evaluated experimentally. Test runs on synthetic and experimentally derived raw data suggest that BOD5 can be predicted to within 15% ca. 36 h. The method can be improved by filtering out, via a digital filter, noise from the raw data. The suggested algorithm does not require elaborate computations or large data storage and can therefore be implemented on a low‐cost microcomputer for fast on‐line determination of BOD5.