Second-Generation Magnesium Phosphates as Water Extractant Agents in Forward Osmosis and Subsequent Use in Hydroponics.
Second-Generation Magnesium Phosphates as Water Extractant Agents in Forward Osmosis and Subsequent Use in Hydroponics.
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DOI：
10.3390/membranes13020226
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发表时间：
2023-02-13
期刊：
影响因子：
4.2
通讯作者：
中科院分区：
文献类型：
--
作者：
从废水流中回收营养物质用于农业施肥是一种有趣的方法。在正向渗透（FO）系统中使用回收的磷酸镁（MgP）盐作为抽提液，以提取水分并生产用于生菜（Lactuca sativa， L.）水培系统的营养液。由于MgP盐（即鸟粪石、黑锰矿和cattiite）在水中的溶解度较低，因此使用柠檬酸和硝酸成功地进行了酸溶试验，达到pH 3.0。FO对溶解盐的稀释达到了接近水培培养所需的水平。离子通过膜的迁移量为中高，虽然没有限制系统的稀释潜力，但可能会降低FO工艺的整体可行性。在水培系统中，三种MgP盐使用回收的水作为营养液，一旦适当地补充所需浓度的营养物质，就可以实现生菜的功能生长。这是一种促进水培中水再利用的创新方法，它受益于使用沉淀的MgP盐作为营养源。
The recovery of nutrients from wastewater streams for their later use in agricultural fertilization is an interesting approach. Wastewater recovered magnesium phosphate (MgP) salts were used in a forward osmosis (FO) system as draw solution in order to extract water and to produce a nutrient solution to be used in a hydroponic system with lettuces (Lactuca sativa, L.). Owing to the low solubility of the MgP salts (i.e., struvite, hazenite and cattiite) in water, acid dissolution was successfully tested using citric and nitric acids to reach pH 3.0. The dilution by FO of the dissolved salts reached levels close to those needed by a hydroponic culture. Ion migration through the membrane was medium to high, and although it did not limit the dilution potential of the system, it might decrease the overall feasibility of the FO process. Functional growth of the lettuces in the hydroponic system was achieved with the three MgP salts using the recovered water as nutrient solution, once properly supplemented with nutrients with the desired concentrations. This is an innovative approach for promoting water reuse in hydroponics that benefits from the use of precipitated MgP salts as a nutrient source.
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