不同氧化剂去除饮用水中溶解性Mn^2＋的比较研究  

Removal of soluble manganese from drinking water with various oxidant

作　　者：唐玉朝[1] 徐满天 杨妍?[2] 施微[2] 黄显怀[1] 胡伟[1] 李卫华[1] 钱益群 

机构地区：[1]安徽建筑大学水污染控制与废水资源化安徽省重点实验室,安徽合肥230601 [2]合肥供水集团有限公司,安徽合肥230011

出　　处：《应用化工》2017年第11期2106-2110,共5页Applied Chemical Industry

基　　金：国家科技重大专项(2014ZX07405-003);安徽省教育厅自然科学重点项目(KJ2015A109);安徽建筑大学-合肥供水集团有限公司产学研合作课题资助(AJ-CXY-KF1650)

摘　　要：用KMnO_4、ClO_2、NaClO、Na_2S_2O_8、KHSO_5及O_3等水处理中常见的氧化剂去除水中的Mn^(2+),考察了投加量、联合投加、紫外光照、pH和共存离子等对Mn^(2+)去除率的影响。结果表明,KMnO_4和O_3对溶解的Mn^(2+)有很好的去除效果,当KMnO_4与Mn^(2+)投加比为2∶3时,反应30 min后,Mn^(2+)下降至0.006 mg/L;O_3流量0.6 L/min,5 min后Mn^(2+)下降至0.056 mg/L。KMnO_4和O_3在弱碱性条件下去除效果更佳。ClO_2有一定去除效果。采用UV辐射,在UV254/ClO_2、UV254/KHSO_5、UV254/Na_2S_2O_8系统中,当氧化剂与Mn^(2+)摩尔比分别为8∶5,4∶1和4∶1时,对起始Mn^(2+)浓度在0.8~0.9 mg/L的模拟水样,Mn^(2+)可分别下降至0.006,0.006,0.001 mg/L,均优于国家标准。单用NaClO处理,在较短反应时间条件下,效率较低,若UV254/NaClO联用,则亦有较好去除效果。KHSO_5/KMnO_4与Mn^(2+)比例为5∶2时,Mn^(2+)下降至0.06 mg/L,较单个投加效果显著提高。The effects of dosages of oxidant which were available in water treatment( KMnO_4,ClO_2,NaClO,Na_2S_2O_8,KHSO_5 and ozone),multi-oxidants,UV light,pH value and coexist ions were investigated. The results showed that the KMnO_4 and O_3 were effective oxidants for the removal of Mn^(2+),when the molar ratio of KMnO_4 and Mn^(2+)was 2∶ 3,after 30 min,the residual manganese was 0. 006 mg,5 min later Mn^(2+)decrease to 0. 056 mg/L under 0. 6 L/min O_3 air flow rate. The performance of the removal can be best improved when KMnO_4 or O_3 were used under high pH; ClO_2 performed a certain effect; Under UV light,in UV254/ClO_2,UV254/KHSO_5 and UV254/Na_2S_2O_8 system,the molar ratio of oxidants and Mn^(2+)were 8∶ 5,4∶ 1 and 4∶ 1,the Mn^(2+)concentration was 0. 8 ~ 0. 9 mg/L simulated water sample,the residual manganese decreased to 0. 006,0. 006,0. 001 mg/L respectively,these were better than the national standard. NaClO were not effective oxidants for Mn^(2+)removal in a short time,but UV254/NaClO performed a certain effect. The molar ratio of KHSO_5/KMnO_4 and Mn^(2+)were 5∶ 2,Mn^(2+)decreased to 0. 06 mg/L,the performance can be highly improved than used separately.

关 键 词：饮用水 Mn^2+去除 KMNO4 臭氧 紫外光 

分 类 号：TQ137.1[化学工程—无机化工] X524[环境科学与工程—环境工程]