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首页> 外文期刊>Aquacultural Engineering: An International Journal >Ammonia retention capacity of nanofiltration and reverse osmosis membranes in a non steady state system, to be use in recirculation aquaculture systems (RAS).
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Ammonia retention capacity of nanofiltration and reverse osmosis membranes in a non steady state system, to be use in recirculation aquaculture systems (RAS).

机译：在非稳态系统中，纳滤和反渗透膜的氨气保留能力，可用于循环水产养殖系统（RAS）。

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摘要

Recirculation aquaculture systems (RAS) need to control ammonia level because the high toxicity on fish. For this, nanofiltration membrane has been proposed in the first part of our study to separate ammonia from water. We discussed different membranes as well as transmembrane pressure (TMP) and pH to achieve the best results for ammonia retention (AR). In this second part we analyze the influence of the ammonia concentration on AR to obtain higher concentrated volume that can be separated of the system and treated later. A model solution in a non-steady state was used, where the ammonia concentration increase over the time. Since water has similar molecular weight that ammonium ions, the mechanisms for the rejection of ammonia are based on the repulsive electrochemical forces on the active layer. A RO membrane DSS-HR98PP and three NF membranes, NF90, NF200 and NF270 were tested over a range of 0-11.45 mg/L under optimal TMP of 16 bar for NF membranes and 24.5 bar for the RO membrane. Projecting the results to the RAS, NF270 is the most efficient for ammonia retention, as both flux and AR influence the engineering design concept. For example, treating 2000 L/h with an ammonia concentration of 7 mg/L, removal is 17.5 g/m2 day with a membrane area of 13 m2 and TMP of 16 bar.
机译：循环水产养殖系统（RAS）需要控制氨水平，因为对鱼类的毒性很高。为此，在我们的研究的第一部分中提出了纳滤膜，用于将氨从水中分离出来。我们讨论了不同的膜以及跨膜压力（TMP）和pH，以实现最佳的氨气保留（AR）结果。在第二部分中，我们分析了氨气浓度对AR的影响，以获得更高的浓缩体积，可以将其从系统中分离出来，然后再进行处理。使用非稳态的模型溶液，其中氨浓度随时间增加。由于水的分子量与铵离子的分子量相近，因此氨的排斥机理是基于活性层上的排斥电化学力。 RO膜DSS-HR98PP和三个NF膜NF90，NF200和NF270在最优TMP为16 bar且RO膜为24.5 bar的情况下，在0-11.45 mg / L的范围内进行了测试。将结果投影到RAS上，NF270对氨气的保留效率最高，因为通量和AR都会影响工程设计概念。例如，以7 mg / L的氨浓度处理2000 L / h，去除率为17.5 g / m 2 天，膜面积为13 m 2 和TMP 16巴。

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