Integral electroplating waste water treatment equipment and process

Abstract

The invention discloses integral electroplating waste water treatment equipment, which comprises an integral electroplating waste water pool, a decomplexing pool, a coagulating pool, a flocculating pool, a precipitating pool and a clean water pool in sequential connection and is characterized in that a ferrous sulfide filling material bed is also arranged between the decomplexing pool and the coagulating pool, a water inlet of the ferrous sulfide filling material bed is positioned under the ferrous sulfide filling material bed, and a water outlet of the ferrous sulfide filling material bed is positioned above the ferrous sulfide filling material bed. The invention also discloses an integral electroplating waste water treatment process, which is characterized in that ferrous sulfide is used as slow release filling materials, in addition, the decomplexed electroplating waste water is in sufficient contact with the ferrous sulfide for reaction, hexavalent chromium is reduced to trivalent chromium, and in addition, the trivalent chromium forms stable sulfide precipitates with heavy metals beyond the hexavalent chromium. The integral electroplating waste water treatment equipment and the process are used for the integral electroplating waste water treatment and have the advantages that the operation is convenient, the control is easy, the operation cost is low, the raw materials are easy to obtain, the continuous reagent feeding is not needed, stronger adaptability is realized on the waste water ingredients, the concentration and the water quality, and the like.

Description

technical field [0001] The invention relates to the field of electroplating wastewater treatment, in particular to a comprehensive electroplating wastewater treatment equipment and process. Background technique [0002] In the electroplating industry, commonly used plating types include galvanized, copper-plated, chrome-plated, galvanized, cadmium-plated, etc. The sources of waste water are quite extensive, generally: (1) plating parts cleaning waste water, (2) electroplating waste water, (3) other waste water: including washing the floor of the workshop, scrubbing the floor and ventilation equipment condensate and due to the leakage or operation of the plating tank Various bath liquids and drainage caused by improper management; (4) equipment condensate: equipment condensate is generally not polluted by heavy metals except for cooling during use. Among them, the cleaning wastewater of plating parts is the main source of electroplating wastewater, accounting for more than 8...

AI Technical Summary

Problems solved by technology

However, at present, most electroplating factories have multiple electroplating varieties at the same time, and there is no separation and separation of electroplating wastewater, resulting in the mixed discharge of various electroplating wastewater, which brings certain difficulties to the treatment of wastewater

And for the same electroplating factory, the daily variation of water quality is also large, and the amount of dosing is not easy to control. If the amount of dosing is insufficient, the treatment will not meet the standard, and if the amount of dosing is too much, the treatment cost will increase.

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