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首页> 外文期刊>RSC Advances >Performance and properties of coking nanofiltration concentrate treatment and membrane fouling mitigation by an Fe(ii)/persulfate-coagulation-ultrafiltration process
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Performance and properties of coking nanofiltration concentrate treatment and membrane fouling mitigation by an Fe(ii)/persulfate-coagulation-ultrafiltration process

机译：Fe（ii）/过硫酸盐-混凝-超滤工艺处理焦化纳滤浓缩物的性能和减缓膜结垢的性能

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Coking nanofiltration (NF) concentrates, as typical wastewater with high salinity and refractory organics, have become one of the greatest challenges for “near-zero emission” processes. In our study, an advanced oxidation technology based on ferrous iron/persulfate (Fe( II )/PS) and polyferric sulfate (PFS) coagulation coupled with ultrafiltration (UF) was used to treat NF concentrates and mitigate membrane fouling. Based on batch experiments, the optimal parameters of Fe( II )/PS were obtained, during which we discovered that the slow reaction stage of total organic carbon (TOC) removal followed first-order degradation kinetics. Under the optimal reaction conditions, Fe( II )/PS could efficiently mineralize 69% of organics in coking NF concentrates. In order to eliminate the iron floc generated in the Fe( II )/PS step, a small amount of PFS (0.05 mM) was added to coagulate the iron floc, which could further improve the effluent quality so that the turbidity, iron content and TOC were significantly reduced by 79.18%, 98% and 21.79% respectively. Gas chromatography coupled with time-of-flight mass spectrometry (GC × GC-TOFMS) and fluorescence excitation-emission matrix spectrometry (EEM) were performed to characterize the removal of phenols, PAHs, quinolines and humic acids in NF concentrates which were responsible for UF membrane fouling. Moreover, scanning electronic microscopy (SEM) and atomic force microscopy (AFM) were conducted to study the surface of the UF membrane after treatment of NF concentrates. The result exhibited that the organic pollutants deposited on the UF membrane surface were reduced by Fe( II )/PS-PFS pretreatment, and UF membrane flux was thus enhanced. Our results show the potential of the approach of applying Fe( II )/PS-PFS-UF in NF concentrate treatment.
机译：焦化纳滤（NF）浓缩物是具有高盐度和难处理有机物的典型废水，已成为“近零排放”过程的最大挑战之一。在我们的研究中，基于铁/过硫酸亚铁（Fe（II）/ PS）和聚硫酸铁（PFS）凝结结合超滤（UF）的先进氧化技术用于处理NF精矿并减轻膜污染。基于分批实验，获得了Fe（II）/ PS的最佳参数，在此过程中，我们发现总有机碳（TOC）去除的缓慢反应阶段遵循一级降解动力学。在最佳反应条件下，Fe（II）/ PS可以有效地使焦化NF精矿中69％的有机物矿化。为了消除Fe（II）/ PS步骤中产生的铁絮凝物，添加了少量的PFS（0.05 mM）来凝结铁絮凝物，这可以进一步改善废水质量，从而使浊度，铁含量和TOC分别显着降低了79.18％，98％和21.79％。进行了气相色谱-飞行时间质谱分析（GC×GC-TOFMS）和荧光激发-发射矩阵分析法（EEM）的表征，表征了NF浓缩物中酚，PAHs，喹啉和腐殖酸的去除超滤膜结垢。此外，还进行了扫描电子显微镜（SEM）和原子力显微镜（AFM）的研究，以研究处理NF精矿后超滤膜的表面。结果表明，Fe（II）/ PS-PFS预处理可减少沉积在超滤膜表面的有机污染物，从而提高超滤膜通量。我们的结果显示了在NF精矿处理中应用Fe（II）/ PS-PFS-UF的方法的潜力。

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