Coagulation and sludge recovery using titanium tetrachloride as coagulant for real water treatment: A comparison against traditional aluminum and iron salts
Coagulation and sludge recovery using titanium tetrachloride as coagulant for real water treatment: A comparison against traditional aluminum and iron salts
复制标题
使用四氯化钛作为混凝剂进行实际水处理的混凝和污泥回收：与传统铝盐和铁盐的比较
DOI：
10.1016/j.seppur.2014.04.015
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发表时间：
2014-06-10
影响因子：
8.6
通讯作者：
Li, Q.
中科院分区：
文献类型：
--
作者：
Zhao, Y. X.;Gao, B. Y.;Li, Q.
比较研究了四氯化钛（TiCl4）、氯化铁（FeCl3）和硫酸铝(Al-2（SO4)(3)）在实际水处理中的混凝/絮凝性能。比较了不同混凝剂剂量和初始溶液pH条件下的UV254 （254 nm吸光度）、DOC（溶解有机碳）去除率和剩余浊度。采用激光衍射粒度仪研究了三种混凝剂混凝/絮凝过程中絮凝体的特性。通过超滤（UF）膜的膜污染电位和混凝-超滤（C-UF）过程中使用搅拌和无端间歇式UF装置的膜污染电位，对三种混凝剂的性能进行了评价。另外，对TiCl4絮凝污泥进行热处理回收制备二氧化钛（TiO2）。结果表明，与FeCl3和Al-2（SO4）相比，TiCl4具有更好的混凝性能(3)，对UV254和DOC的最佳去除率分别为54.9%和55.1%。与FeCl3和Al-2（SO4）形成的絮凝体相比，TiCl4形成的絮凝体生长速度最快，粒径最大(3)，但絮凝体强度最弱，再生长能力最差。TiCl4和FeCl3得到的絮凝体压实程度相当，高于Al2(504)3。此外，对膜污染的研究表明，通量下降的严重程度依次为Al-2(SO4)(3) < FeCI3 < TiCl4。对TiCl4混凝污泥进行了x射线衍射、热分析和扫描电镜表征。(C) 2014 Elsevier B.V.版权所有
Coagulation/flocculation performance of titanium tetrachloride (TiCl4), ferric chloride (FeCl3) and aluminum sulfate (Al-2(SO4)(3)) was comparatively investigated for real water treatment. Comparisons were made under different coagulant dose and initial solution pH conditions and their performances measured in terms of UV254 (absorbance at 254 nm) and DOC (dissolved organic carbon) removal and residual turbidity. Characteristics of aggregated flocs during the coagulation/flocculation process by the three coagulants were studied using a laser diffraction particle sizing device. The performances of the three coagulants were also assessed in terms of the membrane fouling potential of the ultrafiltration (UF) membrane or during coagulation-ultrafiltration (C-UF) process using a stirred and dead-end batch UF unit. Additionally, the TiCl4 flocculated sludge was recovered to produce titanium dioxide (TiO2) under thermal treatment. The results indicate that the TiCl4 showed superior coagulation performance compared to that of FeCl3 and Al-2(SO4)(3), with the optimum removal of UV254 and DOC of 54.9% and 55.1%, respectively. The aggregated flocs formed by TiCl4 showed the highest growth rate with the largest size compared to those by FeCl3 and Al-2(SO4)(3), but with the weakest floc strength and the worst re-growth ability. The TiCl4 and FeCl3 yielded the flocs with comparable degree of compaction, higher than that by Al2(504)3. Additionally, the investigation of membrane fouling demonstrated that the severity of flux decline followed the order of Al-2(SO4)(3), < FeCI3 < TiCl4. TiCl4 coagulated sludge was also characterized by X-ray diffraction, Thermal analysis and scanning electron microscope. (C) 2014 Elsevier B.V. All rights reserved.