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A full-scale trickling filter fitted with SessilĀ® plastic media was studied at a snack food processing plant for 205 days. Water quality including biochemical oxygen demand (BOD) and total suspended solids (TSS) were monitored while the distributor speed was varied from 15 to 5.25 minutes per revolution to try and optimize performance. Influent BOD was approximately 1300 and 1000 mg/L for total and soluble BOD respectively. Effluent soluble and settled BOD during the optimization period was approximately 200 and 150-300 mg/L respectively. Percent BOD removal improved from a pre-optimization average of 66 to greater than 80 percent during the optimization trials. A net positive change in pH from influent to effluent was found to relate to improved removal of BOD in the trickling filter. The TSS in the influent varied from approximately 200 to 400 mg/L while effluent TSS ranged widely from 400 to over 1300 mg/L. However, following a 30-minute settling period, the TSS in the settled effluent was consistently below 200 mg/L and averaged 130 mg/L during the optimization period. From these results it was concluded that the most effective mode of operation for this system was to operate at a distributor speed of 5.25 minutes per revolution with Two 2-hour sloughing cycles (45 minutes per revolution) per day.
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Document Type: Research Article

Publication date: 2000-01-01

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