Removal of perfluorooctanoate from surface water by polyaluminium chloride coagulation.
Removal of perfluorooctanoate from surface water by polyaluminium chloride coagulation.
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DOI：
10.1016/j.watres.2010.11.029
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发表时间：
2011-02
期刊：
影响因子：
12.8
通讯作者：
S. Deng;Qin Zhou;Gang Yu;Jun Huang;Qing Fan
中科院分区：
文献类型：
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作者：
S. Deng;Qin Zhou;Gang Yu;Jun Huang;Qing Fan
全氟辛酸(PFOA)已在世界各地的地表水中被检测到，但对其在水处理厂中的混凝去除知之甚少。采用聚合氯化铝(PACl)去除地表水中的全氟辛酸，考察了混凝剂投加量、溶液pH、温度和初始浊度对水中全氟辛酸和悬浮物(SS)的去除效果。由于SS对全氟辛酸具有较高的吸附亲和力，大部分全氟辛酸被吸附在颗粒上，并在混凝过程中通过SS的去除而被去除。水相中全氟辛酸浓度随初始浊度和PACl投加量的增加而降低，随溶液pH和温度的增加而增加。将不同C-F链长和不同官能团的其他全氟化合物(PFC)与全氟辛酸进行了比较。结果表明，疏水相互作用在全氟辛酸在SS上的吸附中起着重要作用。在混凝过程中投加粉末活性炭可显著提高水中全氟辛酸的去除效果，投加1~16 mg/L粉末活性炭后再混凝，初始全氟辛酸浓度为0.5~3 mg/L时，水中全氟辛酸的残留浓度均小于1μg/L。
Perfluorooctanoate (PFOA) has been detected in surface water all over the world, and little is known of its removal by coagulation in water treatment plants. In this study, polyaluminium chloride (PACl) was used to remove PFOA from surface water, and the effects of coagulant dose, solution pH, temperature, and initial turbidity on the removal of both PFOA and suspended solids (SS) from water were investigated. Since the SS had high sorption affinity for PFOA, most PFOA was adsorbed on the particles and removed via the SS removal in the coagulation process. PFOA concentrations in aqueous phase decreased with increasing initial turbidity and PACl dose, while they increased with increasing solution pH and temperature. Other perfluorinated compounds (PFCs) with different C–F chain lengths and functional groups were also compared with PFOA. It was proved that hydrophobic interaction played an important role in the adsorption of PFOA on the SS. The addition of powdered activated carbon (PAC) before the coagulation process significantly enhanced the removal efficiency of PFOA in water, and the residual PFOA concentrations in water were less than 1 μg/L after the addition of 1–16 mg/L PAC and subsequent coagulation when the initial PFOA concentrations were in the range of 0.5–3 mg/L.