Lined evaporation beds

Disposal of Pesticide Wastes in Lined Evaporation Beds... 

Ten lined evaporation beds for disposing of pesticide wastes from used pesticide containers and application equipment were monitored over a two-year period for possible buildup and decay of deposited pesticides The evaporation beds had been In operation for many years prior to sampling and were distributed throughout the state with geographical and cllmatlcal differences. 

The University of California field stations have dealt with dilute pesticide waste disposal on an experimental basis by using lined soil evaporation beds. The beds typically are 20 x 40 x 3 ft pits lined with a butyl rubber membrane and back filled with 12 to 18 Inches of sandy loam soli. Figure 1 Is a cross secton of such a bed. Used containers and spray equipment are washed on an adjacent concrete slab the wastewater drains Into a sedimentation box for trapping particulates, followed by a distribution box In the bed. From the distribution box, the dilute pesticide solutions run underneath the soli surface through leach lines made of 4 Inch perforated PVC pipe. The system Is designed so that water moves up through the soli by capillary action and evaporates off the surface. 

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