Using Grass Strips to Filter Catfish Pond Effluent
Ghate, Suhas R.
Burtle, Gary J.
Newton, G. Larry
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Twelve 4.5 m x 24 m grass strips comprising of two slopes (3% and 1.5%), two grasses (Bermuda and Bahia) and three replications were used to filter pond effluent from an intensive catfish production system. The effluent was applied as overland runoff at the upper ends of the plots and collected at the bottom as it flowed downslope through the grasses. From two years' data, it was found that the grass strips removed nonfilterable (suspended) solids in the ranges of 36%-61% and 19%-82% from the effluent depending upon the initial amounts of solids. This filtering technique may have practical application in reducing nutrient discharge to natural waters and in reducing groundwater consumption by recirculating the filtered effluent.