Bioremediation of aquaculture wastewater: evaluating the prospects of the red alga Palmaria palmata (Rhodophyta) for nitrogen uptake

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• 作者：Britta Grote
• 关键词：Eco ; intensification ; Ecological engineering ; Nutrient uptake ; Dulse ; Protein content
• 刊名：Journal of Applied Phycology
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：28
• 期：5
• 页码：3075-3082
• 全文大小：481 KB
• 刊物主题：Plant Sciences; Freshwater & Marine Ecology; Plant Physiology; Ecology;
• 出版者：Springer Netherlands
• ISSN：1573-5176
• 卷排序：28

文摘

The bioremediation capacity of the red macroalga Palmaria palmata was assessed by two experiments. First, uptake rates of P. palmata cultured in four treatments with varying levels and ratios of the N sources ammonium (NH₄+) and nitrate (NO₃−) (18/15, 0/30, 30/45, 50/65 μM) were measured over a 3-h period to evaluate N source preference. Secondly, P. palmata were cultured in five treatments with varying levels and ratios of ammonium and nitrate (300/12, 0/312, 500/12, 0/512, 250/262 μM) for 3 weeks to evaluate specific growth rates, protein content, and ammonia toxicity. Palmaria palmata had a higher affinity for NH₄+ than for NO₃− as N source. However, in the single N source trials, NO₃− uptake was higher than that of NH₄+. The maximum specific growth rate of 11.99 % day−1 was observed in the 0/512 μM ammonium/nitrate treatment after 3 weeks, whereas the minimum specific growth rate of 2.21 % day−1 was observed in the 500/12 μM ammonium/nitrate treatment after 3 weeks. NO₃− supported higher growth rates, whereas NH₄+ increased tissue N, and therefore protein content. Total protein content of the algal tissue was significantly higher in P. palmata of the NH₄+ treatments, reaching up to 20.6 % DW, than of those from the NO₃-treatments. Palmaria palmata showed signs of poisoning after 3 weeks in the highest NH₄+ treatment. This study indicates that P. palmata is a suitable species for ecological engineering in integrated multitrophic aquaculture systems as it shows a relatively high growth performance, high nutrient uptake rates, and elevated protein content under NH₄+ supply.