Characterisation of titanium tetrachloride and titanium sulfate flocculation in wastewater treatment.
Characterisation of titanium tetrachloride and titanium sulfate flocculation in wastewater treatment.
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DOI：
10.2166/wst.2009.254
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Y. Okour;H. K. Shon;I. E. Saliby
中科院分区：
文献类型：
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作者：
Y. Okour;H. K. Shon;I. E. Saliby
从不同混凝剂剂量、pH、浊度、溶解有机碳(DOC)、UV-254、颜色、zeta 电位、粒径和分子量分布方面研究了四氯化钛 (TiCl(4)) 和硫酸钛 (Ti(SO(4))(2)) 的絮凝。将两种混凝剂与常用混凝剂如氯化铁(FeCl(3))和硫酸铝(Al(2)(SO(4))(3))进行了比较。在所有 pH 值下，四氯化钛显示出最高的浊度去除效果，而硫酸钛则显示出最高的 UV-254 和颜色降低效果。发现四种混凝剂具有相似的有机物去除率，高达 60-67%，并且在不同的分子量范围内产生相似的有机物去除率。与硫酸铝相比，四氯化钛、硫酸钛和氯化铁的沉降絮凝物的倾析性非常高。四氯化钛和硫酸钛的主要混凝机制仍有待研究，因为即使不添加絮凝剂，在不同的 pH 值下也可能发生不同的沉淀反应。四氯化钛和硫酸钛被发现是废水处理中有效的新型混凝剂，不仅可以去除有机物，还可以通过生产二氧化钛减少污泥。
Flocculation with titanium tetrachloride (TiCl(4)) and titanium sulfate (Ti(SO(4))(2)) was investigated in terms of different coagulant doses, pH, turbidity, dissolved organic carbon (DOC), UV-254, colour, zeta potential, particle size and molecular weight distribution. The two coagulants were compared with the commonly used coagulants such as ferric chloride (FeCl(3)) and aluminium sulfate (Al(2)(SO(4))(3)). Titanium tetrachloride showed the highest turbidity removal, while titanium sulfate showed the highest reduction of UV-254 and colour at all pH values. The four coagulants were found to have similar organic removal up to 60-67% and resulted in similar organic removal in terms of various MW ranges. The decantability of the settled flocs was very high for titanium tetrachloride, titanium sulfate and ferric chloride compared with aluminium sulfate. The dominating coagulation mechanisms for titanium tetrachloride and titanium sulfate are still to be studied, since different precipitation reactions might take place at different pH even without flocculant addition. Titanium tetrachloride and titanium sulfate were found as effective new coagulants in wastewater treatment not only in terms of organic matter removal, but also in sludge reduction through the production of titanium dioxide.