A typical performance data summary reported by Lemna is shown in Table 4.16. Similar effluent quality is reported for the systems shown in Figure 4.24. Buddha-varapu and Hancock (1989) reported on the performance of two pilot-scale Lemna systems located in Devils Lake, North Dakota, and DeRidder, Louisiana. The DeRidder system was operated from October 1988 to December 1989, but the period of operation for the Devils Lake facility was only 3 months. The pilot-scale systems produced a good-quality effluent, with average BOD5 concentrations of less than 10 mg/L at both facilities. TSS concentrations were less than 20 mg/L at both sites. Total Kjeldahl nitrogen (TKN) was less than 5 mg/L at both locations. The Devils Lake pilot plant reported TP concentrations of less than 1 mg/L; however, the system was operated for only 3 months during warmer months of the year.
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