A study to link grab sampling frequency to effluent variability and costs

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1976

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Abstract

The nature of variation in BOD5 values from grab samples taken from three secondary wastewater treatment plants is studied by applying Spectral and Cross-spectral analysis. The important periodicities in the data are identified, and it was found that most of the significant periodicities were below a frequency of 0.33 cycles/day. For Plant 3, a weekly cycle was found in the influent BOD load. An analysis of the costs of sampling reveals that it is expensive to detect a high percentage of pollution violations. By recognizing the periodicities, the sampling interval can be increased to 2 or 3 days, and still provide adequate pollution control thus reducing the sampling costs.

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