Ammonia Removal from Facultative Pond Effluents in a Constructed Wetland and an Aerated Rock Filter: Performance Comparison in Winter and Summer
Abstract:The effluent from a facultative pond loaded at 80 kg BOD ha−1 day−1 was treated in a subsurface horizontal-flow aerated rock filter (RF) and a subsurface horizontal-flow constructed wetland (CW) planted with Typha latifolia. Over a 12-month monitoring period BOD and TSS removals were higher, and effluent ammonia concentrations lower, in the RF than in the CW (>75% vs. 25−75%, and 3.6 mg N L−1 vs. 6 mg N L−1, respectively). However, the ammonia concentration was lower in the CW effluent than in the aerated RF effluent during mid-July to mid-September (1.1 mg N L−1 vs. 2.2 mg N L−1), but in winter it was higher than the influent concentration. Overall the performance of the aerated RF was better and more consistent than that of the CW.
Document Type: Research Article
Publication date: 2007-05-01
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