机构地区: 湖南大学环境科学与工程学院
出 处: 《化工环保》 2008年第6期495-499,共5页
摘 要: 采用 K_2FeO_4预氧化—FeCl_3混凝联合去除水中的 As^(3+),考察了适宜的 K_2FeO_4预氧化时间、Fe^(3+)和 Fe^(6+)加入量,分析了预氧化 pH、混凝 pH、碳酸盐和腐殖酸浓度对该工艺去除 As^(3+)效果的影响。实验结果表明:K_2FeO_4预氧化的适宜时间为2 min;加入质量浓度为2.4 mg/L 的 Fe^(6+)和14.0 mg/L 的 Fe^(3+)能使处理后水样中的 As^(3+)浓度符合 GB—57492006《生活饮用水卫生标准》(As^(3+)质量浓度小于0.01 mg/L);预氧化 pH 在4~9范围内,对K_2FeO_4预氧化—FeCl_3混凝去除 As^(3+)的效果影响不大;FeCl_3混凝阶段适宜的 pH 为6.0~8.5。碳酸盐对 K_2FeO_4预氧化—FeCl_3混凝去除 As^(3+)的效果基本没有影响;腐殖酸的存在使 As^(3+)的去除率有一定程度的降低。 The removal of As^3+ from water was carried out by K2FeO4 preoxidation - FeCl3 Coagulation. The effects of preoxidation time, Fe^3+ and Fe^6+ dosage, preoxidation and flocculation pH, carbonate and humic acid concentration on the removal of As^3+ were examined. The results show that under the conditions of preoxidation time 2 min, Fe^6+ dosage 2.4 mg/L, and Fe^3+ dosage 14 mg/L, the content of As^3+ in the treated water can meet the Standards for Drinking Water Quality GB - 57492006 (m( As^3+) 〈0.01 mg/L) ; The preoxidation pH of 4.0 -9.0 has no significant effect on the removal of As^3+ ; The fitting flocculation pH is 6.0 - 8.5 ; Carbonate concentration has basically no effect, while humic acid concentration has somewhat disadvantageous effect on the removal of As^3+.
领 域: [环境科学与工程]