Twenty waste stabilization ponds in Missouri and Kansas were evaluated as to their ability to meet the State effluent requirements. It was found that a large number of these ponds were violating the BOD or the suspended solids requirements on many occasions. The performance of these ponds did not correlate well with the traditional design parameters, such as BOD loading rates or mean hydraulic detention time. The use of multiple cells was also not found to be advantageous in all situations. Some of the pond design equations did not provide a valid method of estimating their performance. Effluent polishing methods are necessary to remove excess suspended solids during the critical summer months.

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