摘要
考察了钛盐混凝剂投加量、pH、pH调节剂Ca(OH)2、混合混凝剂、氧化剂KMnO4、水力条件和共存离子对钛盐混凝除As(Ⅲ)的影响与机制。结果表明,Ti(Ⅲ)除砷效果均远优于Fe(Ⅲ)和Ti(Ⅳ)。不改变混凝过程pH的情况下,As(Ⅲ)去除率随TiCl4投加量的增加而增加;TiCl4在弱碱性条件下除As(Ⅲ)效果最佳。水力条件对TiCl3除砷的影响相对最小,其中快速搅拌的速度和时间属最大影响变量。KMnO4预氧化对TiCl3和TiCl4除As(Ⅲ)有显著促进作用,0.9 mg/L的KMnO4以300 r/min的转速预氧化2 min后加入混凝剂,对As(Ⅲ)的去除率均提升至近100%。共存阴离子SiO32-和H2PO4-对除As(Ⅲ)率抑制作用明显,共存阳离子Ca2+对As(Ⅲ)去除效果影响不大。
The effects of factors including different coagulant dosages, the solution＇s pH value, Ca （OH）2 as regulators, combined use of FeCI3 and TiC13/TiCl4,KMnO4 as oxidant, hydraulic condition and co-existing ions on arsenic removal by the Titanium coagulation were investigated. The results of experiments showed that the arsenic removal with Ti（Ⅲ） was much better than that with Fe（Ⅲ） and Ti（Ⅳ）. Without changing pH in the coagulation process, arsenic removal efficiency increased with increasing dose of TiCl4, and arsenic removal efficiency by TiCl4 was high at mild alkaline conditions. The effect of hydraulic condition on arsenic removal by TICl3 was relatively minimal, while the most influential factor was fast-stirring speed and time. Arsenic removal by TiCI3 and TiCl4 was obviously promoted with KMnO4 preoxidation at 300 r/min for 2 min. When permanganate was applied at 0.9 mg/L, arsenic removal reached nearly 100%. Calcium ion had no obvious effect on arsenic removal, while presence of phosphate and silicate anion in the solution would significantly inhibit the arsenic removal.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第8期61-66,共6页
Technology of Water Treatment
基金
国家自然科学基金(50908001)
安徽省优秀青年科技基金(10040606Y29)
安徽省国际科技合作项目(09080703035)
作者简介
沈珺（1989-），女，硕士研究生，从事饮用水安全保障技术研究；电子邮件：sjun0026@126．com
联系作者：唐玉朝，教授；电子邮件：tangyc@ahjzu．edu．cn
