Abstract
Diurnal series of samples of the effluent and the total in-pond water column of facultative and maturation ponds were analysed for COD, suspended solids, faecal coliforms, chlorophyll and ammonia with a view to finding the most efficient way of obtaining reliable mean daily effluent quality data. The results show that individual samples representative of the entire depth of the pond water column taken at any time of day provided reasonably accurate mean daily effluent values for all the parameters measured when compared with the mean values for effluent quality calculated from a series of grab effluent samples collected throughout the day. The same could not be said for the individual grab effluent samples since they varied considerably. The reasons for these differences are discussed as are the benefits of pond water column sampling for monitoring a number of series of ponds at different locations.
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