Electroplating chromium-containing wastewater treatment method and device

Abstract

The invention discloses an electroplating chromium-containing wastewater treatment method and device. The treatment method comprises the following steps: (A) pre-removing impurities in chromium-containing wastewater by virtue of a pretreatment device, so as to acquire primarily treated effluent; (B) sequentially carrying out primary desalination on effluent by virtue of a cation exchanger and an anion exchanger, carrying out secondary desalination on effluent by virtue of an advanced treatment cation bed and an advanced treatment anion bed again, so as to obtain desalted water which can be recycled for chromium plating rinsing; (C) regenerating by virtue of a cation bed regeneration device when the cation exchanger is saturated and penetrated, and regenerating by virtue of an anion bed regeneration device when the anion exchanger is saturated and penetrated; and (D) carrying out sodium removal on anion bed regenerated liquid, and concentrating to form recyclable high-concentration chromic acid or carrying out evaporative crystallization. According to the electroplating chromium-containing wastewater treatment method, by virtue of a two-stage cation-anion bed system, the environmental pollution of hexavalent chromium is eliminated, and meanwhile, high-quality desalted water can be obtained and can be applied to production, so that the consumption of tap water and desalted water is saved, and the good economic benefit is achieved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method and a treatment device for electroplating chromium-containing wastewater. technical background [0002] Tinplate, commonly known as tinplate, is widely used in the packaging of food, beverages, oleochemicals, coatings, paints, sprays, bottle caps and other daily necessities. According to statistics from the Metal Committee of China Packaging Association, the consumption of tinplate in my country in 2006 was more than In 2005, there was a substantial increase: aerosol cans increased by 11%, beverage three-piece cans increased by 33%, food three-piece cans increased by 71%, crown caps increased by 15%, and chemical tanks increased by 30%. In 2012, the global demand for tinplate reached 2000 During the 12th Five-Year Plan period, my country's packaging industry will grow rapidly, and tinplate containers will face major opportunities, with huge developme...

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Problems solved by technology

[0009] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is a treatment method and a treatment device for electroplating chromium-containing wastewater, which are suitable for processing chromium-containing wastewater in the passivation process of tinplate production. The waste water and the chromium-containing waste water produced during the chrome plating process in the electroplating industry aim to solve the problems of secondary pollution in the current chromium-containing waste water treatment method, less treated water can be reused in the electroplating rinsing process, and chromic acid cannot be recovered.

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