| abstract |
Provided is a highly effective combined method for deep treatment of the waste water from electroplating, which method belongs to the technical field of the treatment of waste water from electroplating. The method comprises the following steps: after subjecting the waste water from electroplating to the pre-treatments of cyanogen decomposition, chrome removal, and coagulation and precipitation, performing a biochemical treatment in a contact oxidizing tank, passing the outlet water of the contact oxidizing tank through a secondary clarifier, and precipitating same by inclined tube sedimentation to achieve the separation of mud and water; then transporting the outlet water into a coagulation and precipitation tank, dosing with a flocculating agent and a coagulant agent for coagulation and precipitation; using the above-mentioned outlet water as the inlet water of a resin adsorption tank, using a magnetic resin for an adsorption reaction; and after the outlet water from the adsorption has passed a filter, passing same into a fixed-bed resin adsorption unit, so that the outlet water therefrom reaches the discharge criteria or is recovered and reused. The concentrations of heavy metals such as Cu 2+ and Ni 2+ in the treated outlet water are all less than 0.02 mg/L, and the COD thereof can be maintained at 20 mg/L. The water can achieve both the standard in table 3 of The Discharge Standard for Pollutants from Electroplating Industry GB21900-2008 and the standard of type III water in The Environmental Quality Standards for Surface Water GB3838-2002. The process has excellent adaptability to waste water, good economic properties and low costs. |