| 摘要 |
PURPOSE:To improve treating efficiency by oxidation-treating cyanide containing waste water with Fenton's reagent, next adding copper salt to decompose excess hydrogen peroxide and further adding a reducing agent to make cyanide compounds hard to dissolve, permitting them to be separated. CONSTITUTION:Fenton's reagent which is formed by combining hydrogen peroxide and ferrous salt is added to cyanide containing waste water under acidic conditions of pH2-6 to give it oxidation treatment. In this case, the added quantity of the reagent is determined by previously giving sampling treatment to the waste water so that treating time may be about 0.5-5hr. After the oxidation treatment, sodium hydroxide, etc., are added to make it alkaline, pH8-10, and copper salt, such as copper sulfate is added by such amount that treating time may be about 10min-3hr to decompose excess hydrogen peroxide. Next, a reducing agent, such as sodium sulfite is added under conditions of pH2-10 by such amount that treating time may be 5min-1hr to make cyanide compounds hard to dissolve. Next, the precipitate is removed in a precipitator, etc. |
