Guangdong Guangye Environmental Protection Industry Group Company Limited, Guangye Institute of Environmental Engineering Technology, Guangzhou, 510030, Guangdong, People's Republic of China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Jul;26(19):19729-19737. doi: 10.1007/s11356-019-05254-3. Epub 2019 May 14.
In this study, MgO-modified palygorskite (MgO-PAL) was used for simultaneous recovery of ammonia nitrogen (AN) and phosphate, and the effects of pH, ions, and organic acids on nutrient recovery were investigated. The highest removal amount of AN and phosphate separately reached 42.6 mg/g and 69.8 mg/g at pH of 9.0, 0.6 g/L dosage of modified palygorskite, and 180 min of the reaction time. MgO-PAL provided a wide range of pH (3-9) for nutrient removal. Mg released concentration was tested to investigate the removal mechanisms. The individual presence of four cations (K, Ca, Na, and Mg) showed negative effect on AN removal at different mass concentrations. However, those cations, except Na, exhibited positive influence on phosphate removal. Compared with SO, COshowed more negative effect on nutrient removal due to the reaction between Mg and CO. The results showed that the nutrient removal amount and the morphology and composition of collected products were not affected in the presence of acetic acid. Citric acid, humic acid, and fulvic acid displayed the inhibition effects on the morphology of the crystallized products.
在这项研究中，采用了镁改性坡缕石（MgO-PAL）同时回收氨氮（AN）和磷酸盐，并研究了 pH 值、离子和有机酸对养分回收的影响。在 pH 值为 9.0、改性坡缕石用量为 0.6 g/L、反应时间为 180 min 的条件下，AN 和磷酸盐的最大去除量分别达到 42.6 mg/g 和 69.8 mg/g。MgO-PAL 为养分去除提供了广泛的 pH 值（3-9）范围。测试了 Mg 的释放浓度以研究去除机制。四种阳离子（K、Ca、Na 和 Mg）的单独存在在不同的质量浓度下对 AN 的去除表现出负效应。然而，除了 Na 之外，这些阳离子对磷酸盐的去除都表现出积极的影响。与 SO 相比，CO 由于 Mg 与 CO 的反应，对养分去除表现出更负的影响。结果表明，在存在乙酸的情况下，养分去除量以及收集产物的形态和组成不受影响。柠檬酸、腐殖酸和富里酸对结晶产物的形态表现出抑制作用。
