Method for removing COD (Chemical Oxygen Demand) in metallurgical wastewater
A waste water and heavy metal technology, applied in metallurgical waste water treatment, energy waste water treatment, chemical instruments and methods, etc., can solve the problems of low removal rate of dissolved substances, low reuse rate of activated carbon, unfavorable growth of microorganisms, etc., to save the amount of oxidant , Shorten electro-oxidation time, low cost effect
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Embodiment 1
[0028] First, take 1.5L of organic wastewater from the nickel-cobalt metallurgy industry, and detect that the influent COD is 722mg / L, according to figure 1 The procedure for removing COD from the sample wastewater. There is no or a small amount of oil in the wastewater in this example, and an appropriate amount of 10% alkali solution is added according to the characteristics of the wastewater. After the solution is adjusted to a pH of 9.0, it is poured into the reaction vessel of the special electrode electrolysis device , add 0.1g of activated carbon as a catalyst, and adjust the current density of the electrode to 50mA / cm 2 , after incomplete electrocatalytic oxidation of wastewater for 10 minutes, add a small amount of acid solution to the electrocatalytic oxidation solution, adjust the pH to 3.5, add 1.5mg of H 2 o 2 As an oxidant, the organic wastewater is further oxidized. After the oxidation reaction is completed, the solid-liquid separation of the wastewater is compl...
Embodiment 2
[0030] First, take 1.5L of high-salt and refractory organic wastewater from the non-ferrous metallurgy industry, and detect that the influent COD is 24120mg / L. figure 1 The procedure for COD removal of the sample wastewater is carried out. According to this embodiment, the wastewater contains soluble organic matter such as oil, and an appropriate amount of acid solution is added to adjust the solution to acidity until the organic matter in the wastewater is precipitated, which is conducive to subsequent oxidation. Pour the pretreated wastewater into the reaction vessel of the special electrode electrolysis device, add 0.1g of iron-carbon catalyst as a catalyst, and adjust the current density of the electrode to 45mA / cm 2 , after incomplete electrocatalytic oxidation of wastewater for 5 minutes, then add 0.20 mg of H to the solution after electrocatalytic oxidation 2 o 2As an oxidant, adjust the pH to 3, and further oxidize the organic wastewater. After the oxidation reaction ...
Embodiment 3
[0032] First, take 1.0L of high-salt and refractory organic wastewater from the non-ferrous metallurgy industry, and detect that the influent COD is 1630mg / L. figure 1 According to the characteristics of the wastewater, add an appropriate amount of dilute acid solution, adjust the solution to pH = 8, pour it into the reaction vessel of the special electrode electrolysis device, add 0.1g iron carbon as a catalyst, and adjust the electrode to be energized The current density is 150mA / cm 2 , voltage 4.6V, after incomplete electrocatalytic oxidation reaction of wastewater for 3 minutes, then add 0.40 mg of NaClO as oxidant to the liquid after electrocatalytic oxidation, and further oxidize organic wastewater. After the oxidation reaction is completed, complete solidification of wastewater liquid separation, and the effluent detection, the COD in the wastewater is reduced from 1630mg / L to 58.3mg / L, the removal rate can reach 96.36%, and the slag amount is about 1 / 10 of the existing...
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