Method for simultaneously treating high concentration of sulfide and organic composition contained in waste liquid

A method for simultaneously treating sulfide and organic composition contained in a waste liquid, comprising:

• (A) step of sulfur removal by precursory stabilizing conversion under the operating conditions of pH value >12, it is adding a precursory oxidant or the precursory oxidant accompanied by aerating with oxygen-containing gas to a waste liquid containing sulfide and COD having a temperature of 25-70° C., and make it mixed thoroughly and evenly;
• wherein, the precursory oxidant is hydrogen peroxide or sodium percarbonate, and in mg/L, a ratio of the precursory oxidant/the total amount of sulfide is 2.20 to 6.37;
• (B) step of sulfur removal by advanced oxidative degradation, it is sufficiently mixing evenly an advanced oxidant and the waste liquid after treatment in the above step (A);
• wherein, the advanced oxidant is sodium persulfate or potassium persulfate, and in mg/L, a ratio of the advanced oxidant/COD after the above step (A) is 7.63 to 33.27;
• (C) step of UV illumination, it is using UV illumination method to illuminate the oxidant dissolved in the waste liquid after the above step (B) or UV light to illuminate together with the residual hydrogen peroxide and/or sodium percarbonate in the waste liquid of the above step (A), the oxidant dissolved in the waste liquid is activated, and aerated with oxygen-containing gas.