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中文摘要：
碳纳米管由于其特殊的吸附性能，对在天然水体中广泛存在的腐殖酸（HA）具有良好的吸附性，可用于腐殖酸的去除。对不同DOC含量和pH值条件下碳纳米管吸附去除腐殖酸以及使用碳纳米管改性聚合氯化铝（PACl）作混凝剂时混凝过程中絮体的形成与破碎进行了研究。结果表明：当水样DOC为4mg／L、pH值为7．5时，使用不加碳纳米管的PACl作混凝剂，投加量为0．1mmol／L时沉后水DOC浓度达到最低。碳纳米管对腐殖酸的吸附去除率随pH值的升高而下降，随碳纳米管含量的增加而增加，吸附主要发生在前60min内。随着DOC含量的升高，混凝过程对DOC的去除率下降。当pH值为7．5、DOC为2mg／L时，碳纳米管含量对于平衡时絮体的粒径无明显影响，但可以增加再生长后絮体粒径，改善絮体的沉降性，提高混凝效果。
英文摘要：
With excellent adsorption capacity for humic acid （HA） widely existed in natural water bodies due to their special adsorption performance, carbon nanotubes （CNTs） can be used to remove HA. The HA adsorption on CNTs as well as the formation and breakage of flocs during coagulation using polyaluminum chloride （PAC1） modified by CNTs as coagulant under different conditions of DOC and pH were investigated. The results showed that when the concentration of DOC and pH of the sample were 4 mg/L and 7.5 respectively, the lowest concentration of DOC in the sedimentation effluent was achieved using 0.1 mmol/L of PAC1 without CNTs. The removal efficiency for HA by CNTs decreased with increasing the pH value, but increased with increasing the concentration of CNTs. The HA molecules were mostly removed at first 60 min in the adsorption process. The removal efficiency for DOC in the coagulation process decreased with increasing the concentration of DOC. The concentration of CNTs had no significant effect on the floc size after growth when the concentration of DOC and pH were 2 mg/L and 7.5 respectively, but they could increase the floc size after re-growth, improve the settleability of flocs and enhance the coagulation effect.
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