一种电镀废水净化、资源综合利用的方法

Method for purifying electroplating wastewater and comprehensively utilizing resources

Abstract

The invention relates to a method for purifying electroplating wastewater and comprehensively utilizing resources, which is to adopt low-cost strong basic anion-exchange resin containing macropores and imidazole structure to reclaim valuable resources in the electroplating wastewater by coupling technology based on a chemical oxidation-reduction method, a precipitation method and an ion exchange method. The method comprises the following steps: firstly, Cr(III) is oxidized into Cr(VI) under basic condition through a chemical reaction; then, Zn, Cu, Ni and other heavy metal elements in the wastewater are transformed into precipitation of hydroxide; and finally, the Cr(VI) in the wastewater is adsorbed by the strong basic anion-exchange resin, the purified water quality achieves the requirement of electroplating pollutant discharge standard and recycle, and the Cr and other heavy metal resources in the electroplating wastewater can be comprehensively reclaimed and utilized. The method overcomes the defects that the prior regenerating process of porous weak-basic resin requires acidification, and the method has the advantages of simple process, low treatment cost, large treatment quantity and acid and base consumption conservation, and is the electroplating wastewater treatment method with green environmental protection and efficient utilization of resources.
本发明涉及一种电镀废水净化、资源综合利用的方法,采用廉价的含大孔含咪唑结构的强碱阴离子交换树脂,基于化学氧化还原法、沉淀法和离子交换法的耦合技术回收电镀废水中的有价资源。首先通过化学反应使Cr(III)在碱性条件下氧化为Cr(VI),然后使废水中的Zn、Cu、Ni等重金元素转化为氢氧化物沉淀,最后采用强碱性阴离子树脂吸附废水中的Cr(VI),净化后的水质达到电镀污染物排放标准和回用要求,同时使电镀废水中的Cr和其它重金属资源得到综合回收利用。该方法克服了传统孔弱碱性树脂再生过程中需要酸化的缺陷,工艺简单、处理成本低、处理量大和节约酸碱消耗的优点,是绿色环保、资源高效利用的电镀废水处理方法。

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