【摘要】 通过将零价纳米铁（nZVI）与Al₁₃进行复配,研发了兼具原位氧化功能的高电荷聚合态混凝剂nZVI@Al₁₃,考察了nZVI、Al₁₃不同配比和pH值等因素对有机物去除效果、分子质量分布及结构组成的影响。结果表明,混凝剂复配后,Al₁₃中高聚合态铝含量增加,提高了混凝剂的混凝效率。中性条件下,腐殖酸（HA）去除率随Al₁₃投量的增加先增大后趋于平缓,Al₁₃的最佳投量为0. 03 mmol/L,此时HA去除率约为70%;单独nZVI对HA的最大吸附去除率仅为10%; nZVI和Al₁₃复配后对HA的去除效果好于单独两种方式的加和,nZVI对Al₁₃的强化混凝起到协同作用。当pH值> 7. 0时,过多的OH^-使得Al₁₃解聚,影响混凝效果,nZVI和Al₁₃对HA的去除效果均有所下降。当pH值<7. 0时,复配混凝剂对HA的去除率均优于单独Al₁₃,最大去除率达到84%。复配混凝剂对分子质量<2 000 u的有机物的去除效果较单独Al₁₃提高了约8%。更多还原

【Abstract】 A novel coagulant (nZVI@ Al₁₃) with oxidizing ability was prepared by combining nZVI and Al₁₃. The effects of dosage and p H on the organic matter （OM） removal,the molecular weight distribution and the structure composition of OM were analyzed. The results showed that the concentration of high-polymeric aluminum in Al₁₃ increased after the coagulant was reconstituted, which further increased the coagulation treatment efficiency. Under neutral conditions,with the increase of Al₁₃ dosage,the HA removal efficiency was firstly increased and then stabilized. The optimal Al₁₃ dosage was0. 03 mmol/L,and the HA removal rate was approximately 70%. The adsorption removal rate on HA using nZVI alone was 10%. The removal efficiency of HA by nZVI @ Al₁₃ was better than the total efficiency of nZVI and Al₁₃ when used separately. The nZVI showed a synergistic effect on Al₁₃ enhanced coagulation. At pH > 7. 0,excessive OH^- depolymerized Al₁₃ and decreased the coagulation effect of the coagulant,therefore the removal efficiency of HA was reduced. At pH < 7. 0,the removal efficiency of HA by nZVI@ Al₁₃ was higher than using Al₁₃ separately,and the maximum removal rate reached 84%.The removal efficiency of compounded coagulants on organic matter with a molecular weight less than2 000 u was about 8% higher than that of using Al₁₃ separately.更多还原