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Performance investigation of struvite high-efficiency precipitation from wastewater using silicon-doped magnesium oxide

机译：硅掺杂氧化镁废水中斯基钛矿高效沉淀的性能研究

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In this study, a new adsorbent of silicon-doped magnesium oxide (SMG) was developed for the recovery of nutrients from wastewater. The adsorption conditions including adsorbent dosage, initial solution pH, contact time, coexisting substances, N/P molar ratios, and reaction temperature were investigated. Analysis of field emission scanning electron microscopy-energy dispersive spectrometer (FESEM-DES) and specific surface areas (BET) showed that SMG was a mesoporous adsorbent with S-BET of 108.31 m(2)/g. The recycled sediment (RS) was identified as almost pure struvite via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The recovery efficiencies of SMG reached 43.25% of ammonia nitrogen and 97.31% of phosphate at dosage of 0.3 g/L, initial solution pH of 7.0, contact time of 20 min, and temperature of 298 K. Under the optimal reaction conditions, the maximum adsorption capacities of SMG were 170.93 mg/g of ammonia nitrogen and 420.89 mg/g of phosphate at N/P molar ratio of 1.5:1. Coexisting humic acid (HA), calcium (Ca2+), acetic acid (AA), and ferric ions (Fe3+) in nutrient solution hindered the struvite ordered precipitation. The adsorption process followed pseudo-second-order and Elovich kinetic models and was well described by both the Langmuir and Freundlich isotherms at room temperature. All results indicated that the most likely mechanism of nutrients recovery from wastewater was chemical precipitation and proved that SMG was a high-efficiency adsorption material in a wide pH range of 3.0-9.0 for simultaneous recovery of nutrients from wastewater.
机译：在该研究中，开发了一种新的掺杂氧化镁（SMG）的吸附剂，用于从废水中回收营养物质。研究了包括吸附剂剂量，初始溶液pH，接触时间，共存物质，N / P摩尔比和反应温度的吸附条件。对场发射扫描电子显微镜 - 能量分散谱仪（FESEM-DES）和比表面积（BET）的分析表明，SMG是介孔吸附剂，S-BET为108.31m（2）/ g。通过X射线衍射（XRD），傅里叶变换红外光谱（FT-IR）和X射线光电子谱（XPS）鉴定为几乎纯脱稳定的沉积物（RS）。 SMG的恢复效率达到43.25％的氨氮，97.31％的磷酸盐，剂量为0.3g / L，初始溶液pH为7.0，接触时间20分钟，温度为298k。在最佳反应条件下，最大值SMG的吸附能力为170.93mg / g氨氮，420.89mg / g以N / P摩尔比为1.5：1。共存腐殖酸（HA），钙（Ca2 +），醋酸（AA）和营养溶液中的铁离子（Fe3 +）阻碍了Struvite有序沉淀。吸附过程跟踪伪二阶和ELOVICH动力学模型，并在室温下通过Langmuir和Freundlich等温线良好地描述。所有结果表明，最可能从废水中回收营养素的机制是化学沉淀，并证明SMG在宽的pH范围内为3.0-9.0的高效吸附材料，用于同时恢复废水的营养素。

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