The efficiency of phosphorus recovery was also higher in DP1
(approximately 90%) than in DP2 (Table 2). However, unlike nitrogen,
phosphorus was strongly reduced in the anaerobic stage,
probably because of sedimentation (Table 3). The phosphorus
loads applied and removed were 30 and 28.5 kg, respectively, in
the DP series. Thus, the TP removal rate was approximately
470 mg/m2 day, which is in agreement with Cheng et al. (2002b),
who described a removal rate of 590 mgP/m2day by Lemna minor
from pig waste. Unlike nitrogen, the main route for phosphorus removal
in duckweed ponds is biomass absorption. The large difference
in removal rate between N and P may be due to several
The efficiency of phosphorus recovery was also higher in DP1(approximately 90%) than in DP2 (Table 2). However, unlike nitrogen,phosphorus was strongly reduced in the anaerobic stage,probably because of sedimentation (Table 3). The phosphorusloads applied and removed were 30 and 28.5 kg, respectively, inthe DP series. Thus, the TP removal rate was approximately470 mg/m2 day, which is in agreement with Cheng et al. (2002b),who described a removal rate of 590 mgP/m2day by Lemna minorfrom pig waste. Unlike nitrogen, the main route for phosphorus removalin duckweed ponds is biomass absorption. The large differencein removal rate between N and P may be due to several
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