摘要
为了达到盐酸酸洗废水零排放的要求,采用单张阴离子交换膜静态电渗析技术,进行了回收酸洗废水中的酸和铁的实验研究。实验时,根据实际盐酸酸洗废水水质配制模拟废水,分别调整槽电压、电解时间、阴极液pH及Fe2+、阳极液pH进行条件筛选,定时分别自阴、阳极室取样,并分析样品的pH及Fe2+浓度,根据实验结果计算Fe回收率。研究表明,采用不锈钢阴极,钛基锡锑金属氧化物涂层阳极,选用DF120型均相阴离子交换膜,当槽电压为10V,阴极液pH为2.50～3.00,Fe2+为1000～1300mg/L,阳极液pH为3.00时,静态条件下电解反应240min后,Fe的回收率可达到95%,阴极液出水pH为5.13,Fe2+小于60mg/L,阳极液出水pH为1.43。
Static electrodialysis using anion exchange membrane was employed to recover Fe from the HCl pickling wastewater. The static eclctrodialysis system was established with stainless steel as cathode, Sn-Sb metal oxide coated Titanium as anode and the DF120 as anion-exchange membrane. The synthetic wastewater applied in the test was prepared according to the actual HCl pickling wastewater, batch of static electrodialysis experiments were con ducted to determine the effect of cell voltage, reaction time, pH of the cathode electrolyte solution, Fe^2＋ concentration of the cathode electrolyte solution, and pH of the anode electrolyte solution on Fe recovery efficiency. The results showed that the static electrodialysis process presented perfect performance for Fe recovery. When the cell voltage was 10 V, pH of the cathode electrolyte solution ranged 2.50-3.00, Fe^2＋ concentration of the cathode electrolyte solution ranged 1 000-1 300 mg/L, pH of the anode electrolyte solution was 3.00 and electrolyzed for 240 min, the total Fe recovery rate could achieve 95 % with the Fe^2＋ concentrations of the cathode effluent were less than 60 mg/L, and their pH were 5.13 and 1.43 respectively.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第8期51-55,84,共6页
Environmental Pollution & Control
关键词
阴离子交换膜
电渗析
酸洗废水
Fe回收
anion exchange membrane
static eletrodialysis
pickling wastewater
Fe recovery
