磁性阴离子交换树脂对污泥脱水滤液中磷的吸附和再生特性。
Adsorption and regeneration characteristics of phosphorus from sludge dewatering filtrate by magnetic anion exchange resin.
机构信息
College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
出版信息
Environ Sci Pollut Res Int. 2019 Nov;26(33):34233-34247. doi: 10.1007/s11356-018-4049-9. Epub 2019 Jan 7.
Removal and recovery of phosphorus (P) from sewage are essential for sustainable development of P resource. Based on the water quality determination of sludge dewatering filtrate from a wastewater treatment plant in Beijing, this study investigated the adsorption and regeneration characteristics of P by magnetic anion exchange resin (MAEX). The experiments showed that the P adsorption capacity of MAEX could reach a maximum of 2.74 mg/mL when initial P concentration was 25 mg/L and dosage of MAEX was 8 mL/L. The P adsorption on MAEX resin was suitable for large temperature range (283-323 K). However, the adsorption capacity was reduced in various degrees due to the interference of different anions (Br, SO, Cl, NO, HCO, CO) and organic compounds (bovine serum albumin, humic acid). Kinetics studies indicated that the P adsorption process followed the pseudo-second-order model. The MAEX resin had a rapid P adsorption rate and the P adsorption capacity at 30 min could reach 97.7-99.3% of q. Increase of temperature was favorable to P adsorption on MAEX, and the adsorption isotherm data fitted to Langmuir model more than Freundlich model. Meanwhile, the thermodynamics parameters were calculated; it was shown that the adsorption process was an endothermic reaction. Desorption and regeneration experiments showed that NaHCO was a suitable regenerant, and the P adsorption capacity could reach 90.51% of the original capacity after 10 times of adsorption-desorption cycles; this indicated that MAEX resin has an excellent regeneration performance and thus has a very good application prospect of P removal and recovery. Fourier transform infrared spectroscopy (FTIR) analysis confirmed that ion exchange, charge attraction, and hydrogen bonding affected the removal of P by the MAEX resin. The vibrating sample magnetometer (VSM) analysis revealed that MAEX resin was a kind of soft magnetic materials with good magnetism.
从污水中去除和回收磷（P）对于 P 资源的可持续发展至关重要。基于北京某污水处理厂污泥脱水滤液的水质测定，本研究考察了磁性阴离子交换树脂（MAEX）对 P 的吸附和再生特性。实验表明，当初始 P 浓度为 25mg/L、MAEX 用量为 8mL/L 时，MAEX 对 P 的吸附容量最大可达 2.74mg/mL。MAEX 树脂对 P 的吸附适用于较宽的温度范围（283-323K）。然而，由于不同阴离子（Br、SO、Cl、NO、HCO、CO）和有机化合物（牛血清白蛋白、腐殖酸）的干扰，吸附容量会在不同程度上降低。动力学研究表明，P 的吸附过程符合准二级动力学模型。MAEX 树脂对 P 的吸附具有较快的吸附速率，在 30min 时的吸附容量可达 q 的 97.7-99.3%。升高温度有利于 MAEX 对 P 的吸附，吸附等温线数据更符合 Langmuir 模型而不是 Freundlich 模型。同时，计算了热力学参数；结果表明，吸附过程是一个吸热反应。解吸和再生实验表明，NaHCO 是一种合适的再生剂，经过 10 次吸附-解吸循环后，P 的吸附容量可达原始容量的 90.51%；这表明 MAEX 树脂具有优异的再生性能，因此在 P 的去除和回收方面具有很好的应用前景。傅里叶变换红外光谱（FTIR）分析证实了离子交换、电荷吸引和氢键对 MAEX 树脂去除 P 的影响。振动样品磁强计（VSM）分析表明，MAEX 树脂是一种具有良好磁性的软磁材料。
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