Influence of composite flocculant of PAC and MBFGA1 on residual aluminum species distribution
Influence of composite flocculant of PAC and MBFGA1 on residual aluminum species distribution
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DOI：
10.1016/j.cej.2012.03.015
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发表时间：
2012-05
影响因子：
15.1
通讯作者：
Jing Huang;Zhao-hui Yang;G. Zeng;Min Ruan;Haiyin Xu;Wan-Chao Gao;Yuan-ling Luo;Huajun Xie
中科院分区：
文献类型：
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作者：
Jing Huang;Zhao-hui Yang;G. Zeng;Min Ruan;Haiyin Xu;Wan-Chao Gao;Yuan-ling Luo;Huajun Xie
一般来说，大多数生物材料对某些金属离子表现出良好的生物吸附能力。本工作采用微生物絮凝剂GA1（MBFGA1）与PAC复配来控制絮凝水处理中的残留铝。采用荧光分光光度法结合不同的前处理方法对铝进行物种划分并测定其浓度。结果表明，非不稳定单体铝是残留铝中的主要种类，添加MBFGA1可以有效消除它们。采用响应面法建立了两个以絮凝速率和不稳定单体铝浓度为响应变量的二次多项式模型。最佳絮凝条件为MBFGA1浓度为109.37mg/L，PAC浓度为81.87mg/L，初始pH值为8.5，搅拌时间为72.5min，环境温度为24.3℃。傅里叶变换红外光谱和环境扫描电镜分析表明MBFGA1含有大量的官能团，对铝有很强的结合能力，降低混凝絮凝过程中铝的残留水平。
In general, majority of biomaterials have shown good biosorption capacities towards certain of metal ions. In this work, microbial flocculant GA1 (MBFGA1) compound with PAC was used to control the residual aluminum in flocculation water treatment. The fluorescence spectrophotometry combined with different pretreatment methods was employed to divide the species of aluminum and determine their concentration. The results indicated that non-labile monomeric aluminum was the dominant specie in residual aluminum and addition of MBFGA1 could efficiently eliminate them. Two quadratic polynomial models with the response variables of flocculating rate and labile monomeric aluminum concentration were established by response surface methodology, respectively. The optimal flocculating conditions were MBFGA1 at 109.37mg/L, PAC at 81.87mg/L, initial pH at 8.5, time duration of stir 72.5min and ambient temperature at 24.3°C. Fourier transform-infrared spectra and environmental scanning electron microscope analysis indicated that MBFGA1 holded a large number of functional groups, which had strong capacity on binding aluminum and reducing its residual level during coagulation–flocculation.