The capacity of duckweed to treat wastewater: ecological considerations for a sound design
作者： Sabine Körner , Jan E. Vermaat , Siemen Veenstra
DOI: 10.2134/JEQ2003.1583
关键词: Nutrient 、 Wastewater 、 Aquatic plant 、 Organic matter 、 Ecology 、 Biology 、 Sewage treatment 、 Waste disposal 、 Phosphorus metabolism 、 Lemna
摘要: Duckweed species are promising macrophytes for use in sustainable wastewater treatment due to their rapid growth, ease of harvest, and feed potential as a protein source. This paper reviews growth rates different duckweed on ammonia toxicity summarizes insights into the mechanism organic matter nutrient removal. Results were gained from laboratory experiments small, shallow, duckweed-covered semicontinuous batch systems. Growth types vary considerably among species. Ammonia is toxic both ionized un-ionized forms. Duckweed, however, can be used treat containing very high total concentrations long certain pH levels not exceeded. The degradation material enhanced by through additional oxygen supply surface bacterial growth. mat with attached bacteria algae is, independent loading rates, responsible three-quarters nitrogen (N) phosphorus (P) loss shallow Based our results we suggest that full-scale pilot plants should shallower than range encountered literature. A harvesting schedule allows doubling times 2 3.5 d, maintenance full coverage, plug flow conditions recommended.
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