离子交换法处理含Cr(Ⅵ)废水的研究

Study on treatment of waste water containing Cr(Ⅵ) with ion exchange method

采用201×7强碱性阴离子交换树脂处理模拟含Cr(Ⅵ)废水,探讨了废水酸度、交换时间、浓度对Cr(Ⅵ)去除率的影响以及树脂再生所需的合适温度和再生剂浓度。结果表明,201×7强碱性阴离子交换树脂处理模拟含Cr(Ⅵ)废水,具有交换容量大、交换效果好、树脂再生条件较简单等优点。并对实际含铬废水进行了处理,废水中Cr(Ⅵ)的初始浓度为1 540 mg/L,处理量达52 BV(床体积)时,出水中Cr(Ⅵ)的浓度仍小于0.5 mg/L,达到国家排放标准。树脂交换容量约80 mg/g。用8%NaOH溶液,在50℃条件下进行再生效果较好,再生率大于95%,可实现树脂的重复使用。

The waste water containing Cr（Ⅵ） is treated with 201 ×7 strong base type ion exchange resin. Some factors that affect the result of the treatment were studied, such as acidity, exchanging time, concentration of the wastewater, optimum regenerating temperature, regenerating concentration and so on. It has bigger exchange capacity,good exchanging efficiency and simple condition 201 × 7alkali anion exchange resin. Though treating waste water containing Cr（Ⅵ）, it can get to country standard when the initial concentration of Cr（Ⅵ） is 1 540 mg/L,Cr（Ⅵ） concentration still less than 0.5 mg/L for amount of treatment is 52 BV. The exchanging capacity is 80 mg/g. With 8% NaOH （Sodium hydroxide） at 50℃ ,the regenerating rate is over 95% ,and the resin may be reused.