Heavy metal treatment method of electroplating wastewater

Abstract

The present invention discloses a waste water treatment method, in particular to a heavy metal processing method in electroplating effluent, which comprises the steps of pretreatment, detection, filtration, adsorption, ionexchange and regeneration of filter material; wherein the filtration, adsorption and ionexchange processes are gathered to a whole, a sodium form resin serves as the filter material of the filtration, adsorption and ionexchange processes; the electroplating effluent contacts the resin sufficiently at a certain flow rate so as to be completely exchanged; and the resin is regenerated and recovered in good time according to the heavy metal content of the waste water. The present invention has the advantages of that the equipment is simple, the installation is convenient, the former waste water treatment process is not changed, the resin can be regenerated and recovered, the heavy metal ion and the suspended matter SS can be completely removed from the water, and the cost is reduced. The present invention can be widely used in the waste water treatment processes of various electroplating effluent.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating heavy metals in electroplating wastewater. technical background [0002] The existing electroplating wastewater treatment methods include ion exchange method, iron-carbon micro-electrolysis method, chemical method, chemical chelation method, BM bacteria method, CHA biochemical method, etc. Among them, the ion exchange method has good treatment effect and occupies less land, but it has high investment and complicated operation, and only a few enterprises with better management adopt it. The iron-carbon micro-electrolysis process is short and requires less investment, but the effluent stability is poor; the chemical chelation method is complex. , high operating costs; BM bacteria method and CHA biochemical method have moderate investment costs, and the operating costs are generally around 6 yuan per ton of water, which is generally accepted by enterprises. H...

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Problems solved by technology

Among them, the ion exchange method has good treatment effect and occupies less land, but it has high investment and complicated operation, and only a few enterprises with better management adopt it. The iron-carbon micro-electrolysis process is short and requires less investment, but the effluent stability is poor; the chemical chelation method is complex. , high operating costs; BM bacteria method and CHA biochemical method have moderate investment costs, and the operating costs are generally around 6 yuan per ton of water, which is generally accepted by enterprises. However, due to the large changes in water quality and quantity in the electroplating industry, the impact on treatment facilities It is highly resistant, and most of the electroplating process uses complexing agents and chelating agents. It is difficult for heavy metals to meet the standard when the pre-treatment is not thorough. When multiple metal elements coexist, the suitable pH range for precipitation is narrow. When a certain metal When the ion precipitation effect is good, another metal has already begun to dissolve, the reaction of dosing control is relatively lagging, and there are various reasons such as the inability to realize real-time pH control, so that the effluent of electroplating wastewater treated by chemical methods often exceeds the standard.

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