Method for treating wastewater containing heavy metal ions of vanadium, nickel, lead, chromium and equipment thereof

Abstract

The invention discloses a method for treating wastewater containing heavy metal ions of vanadium, nickel, lead, chromium and a device by using the method. The method is characterized by comprising the following steps of: sending the wastewater containing the heavy metal ions of vanadium, nickel, lead, chromium into an electrolytic cell through a multidimensional electrochemical composite treatment device, wherein the heavy metal ions in the wastewater successively consume hydrogen ions, increase hydroxyl ions, and bind with the hydroxyl to generate hydroxides on an anode plate after the electrolysis of the wastewater, and sediment is separated out on an inclined-plate sedimentation tank under a proper PH value and the combined effect of a coagulant aid of polyacrylamide to remove the heavy metal content in the wastewater, so that the generated supernate no longer contains exceeding heavy metals, the supernate is then discharged, and therefore the wastewater does not cause secondary pollution, and the direct discharge of the treated wastewater does not cause any influence on the environment. The technology of the method is simple and easy in implementation.

Description

technical field [0001] The invention relates to a wastewater treatment process and corresponding equipment, in particular to a wastewater treatment process and equipment for treating heavy metal ions containing vanadium, nickel, lead, chromium, etc., and belongs to the technical field of chemical industry. Background technique [0002] Vanadium industrial wastewater is produced by adding sodium salts (Na2CO3, NaCl) to ferrovanadium ore, roasting at high temperature, and immersing the roasted substances (chloride, carbonate, sodium vanadate, etc.) in water. The solution is filtered to obtain sodium vanadate solution and residue, add ammonium chloride and ammonium carbonate to the vanadate solution, filter after reaction, the filter residue is ammonium salt, and the filtrate is wastewater containing vanadium (V) and chromium (VI) . Vanadium industrial wastewater mainly contains the following harmful substances, mainly metal vanadium, heavy metal elements such as lead, molybde...

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Problems solved by technology

[0009] Although the above-mentioned patents have all proposed the treatment of vanadium industrial wastewater, they still have not broken through the conventional treatment methods. The problem in the treatment process is that the amount of medicine that needs to be put into the wastewater is relatively large, the treatment effect is not obvious, and direct discharge will also cause damage to the wastewater. The environment causes certain secondary pollution, so it needs to be further improved

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