Previous researches have found single stage intermittent sand filtration to be a feasible and economic means of upgrading wastewater lagoon effluent to meet future standards. However the major constraint on their use has been the length of the filter runs. Laboratory scale and pilot-scale series intermittent sand filtration of wastewater lagoon effluents has been found to substantially increase the length of filter runs as well as produce a high quality effluent able to meet future standards. Higher loading rates were round to be possible with series intermittent sand filtration. The operation consistently produced an effluent meeting present Utah “Class C” water quality standards for BOD5 (<5 mg/l), and the operation also consistently met the 1980 Utah wastewater treatment plant effluent standard for suspended solids (< 10 mg/l).
Hill, David W.; Reynolds, J. H.; Filip, D. S.; and Middlebrooks, E. J., "Series Intermittent Sand Filtration of Wastewater Lagoon Effluents" (1977). Reports. Paper 429.