零价铁电化学法处理地下水中的六价铬

Treatment of hexavalent chromium in groundwater by zero-valent iron electrochemical

铬对人体有很大的危害,其中以六价铬为最。工业生产所排放的六价铬进入到地下水后,给地下水的环境造成了很大的污染,也危害人们的健康。采用零价铁电化学法处理地下水中的铬,通过在反应器中投加零价铁实现氧化还原反应,通过改变pH、温度、零价铁的投加量以及反应时间来发现对地下水中六价铬的最佳去除效率。试验结果显示,当溶液的pH在2~8,温度在16~42 ℃,零价铁的投加量为0.02~0.08 mg/L,利用零价铁电化学法去除水中的六价铬效率最高。

Chromium,especialy hexavalent chromium is very harmful to the human body.After the hexavalent chromium discharged by industrial production enters the groundwater,it causes great pollution to the environment of the groundwater and also endangers people’s health.In this paper,zero-valent iron electrochemical method is used to treat chromium in groundwater.By adding zero-valent iron to the reactor to achieve electro-oxidation and reduction,the pH value,temperature,amount of zero-valent iron added,and reaction time are used to find the optimal removal efficiency of hexavalent chromium in groundwater.The test results show that when the pH of the solution is in the range of 3~9 and the temperature is in the range of 16~42 ℃,the dosage of zero-valent iron is 0.02~0.08mg/L,zero-valent iron electrochemistry is the most efficient methocl to remove hexavalent chromium from water.