Obtained equations allow for calculating BOD5 of sewage from sugar industry treated in 4 different types of accumulation lagoons on any day of intensive self-purification (May-September) basing on a single BOD5 measurement in the initial phase of this period and on the course of air temperature (a sum of positive temperature-days). Adopting an average course of air temperatures from a long-term period it is possible already after the first measurement to estimate BOD5 in a phase of sewage discharge to the receiver. Established equations refer to particular types of accumulation lagoons.
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