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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p H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4 mg/L、p H值为7.5时,使用不加碳纳米管的PACl作混凝剂,投加量为0.1 mmol/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p H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60 min内。随着DOC含量的升高,混凝过程对DOC的去除率下降。当p H值为7.5、DOC为2 mg/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。
Due to its special adsorption properties, carbon nanotubes have good adsorption to humic acid (HA) which is widely existed in natural water and can be used for the removal of humic acid. The formation and disintegration of flocs in the coagulation process were studied when different levels of carbon monoxide (DOC) and p H values were used to adsorb and remove humic acid and the carbon nanotubes modified polyaluminum chloride (PACl) was used as coagulant . The results showed that when the water sample DOC was 4 mg / L and p H value was 7.5, PACl without carbon nanotubes was used as the coagulant. When the concentration of DOC was 0.1 mmol / L, the concentration of DOC in sediment was the lowest. The adsorption and removal rate of humic acid by CNTs decreased with the increase of p H value, and increased with the increase of CNTs content. The adsorption mainly took place in the first 60 min. With the increase of DOC content, the removal rate of DOC in coagulation process decreased. When p H is 7.5 and DOC is 2 mg / L, the content of carbon nanotubes has no significant effect on the particle size of floc when it is in equilibrium, but it can increase the floc size after re-growth and improve the flocculation and increase Coagulation effect.