Treatment and recycling method of industrial wastewater containing a plurality of heavy metal ions

Abstract

The invention relates to a treatment and recycling method of industrial wastewater containing a plurality of heavy metal ions, and the method can be applied in wastewater treatment and wastewater cyclic utilization of a non-ferrous metal metallurgy manufacturing enterprise. The technology comprises the following steps: wastewater containing a plurality of heavy metal ions, oil separation and desanding, water quality and quantity homogeneous regulation, basic flocculation precipitation reaction, primary precipitation, air floatation and oil removing, sulfuration and flocculation precipitation reaction, secondary precipitation, and filtration. According to the invention, wastewater containing a plurality of heavy metal ions of nonferrous metals and As-containing noble metal ions can be processed, and processed water enters a reclaimed water treatment station to be processed for cyclic utilization. Thus, the pollution of nonferrous metal ions in industrial wastewater to production regions, downtown living environment and surrounding ecological environment is reduced, and recovery rate of nonferrous metal ions is raised. Recovered metal and noble metal have high economic value. Enterprise recycling economy and resource comprehensive utilization are promoted, and reducing discharge and maximum utilization of resources are achieved. Thus, the method provided by the invention has a wide application prospect in the non-ferrous metal metallurgy enterprises.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment in the nonferrous metal smelting industry, and in particular relates to a treatment and recovery method for industrial wastewater containing various heavy metal ions. Background technique [0002] Jinchang City is one of the 108 severely water-scarce cities in the country. The industrial and domestic water in the city and its surrounding areas mainly comes from surface water. The water consumption of the smelting plant area is 68.0651 million m 3 / a, the annual wastewater discharge amounted to 15.51 million tons. With the expansion of the company's production capacity and the extension of the industrial chain, Jinchuan's water consumption has increased dramatically. Due to the extremely low recycling rate of the company's industrial wastewater (especially non-ferrous metal ion wastewater), the amount of sewage discharge has increased sharply. The shortage of resources has increase...

AI Technical Summary

Problems solved by technology

However, the disadvantage of lime as a neutralizing agent is that if you want to reduce the concentration of metal ions in the wastewater, you only need to increase the PH value to increase the OH in the wastewater. - The concentration can achieve the goal; the pH value of different kinds of heavy metal ion precipitation is not the same, if the pH value is too high, a hydroxyl complex will be formed and the precipitation will re-dissolve; at the same time, a large amount of calcium sulfate will be produced, the amount of slag will be large, and the moisture content of the slag will be high. The workload of dehydration and filtration is heavy, and the high hardness of the effluent affects reuse, and heavy metals enter the waste residue, which cannot be comprehensively recovered; lime is used as a neutralization precipitant, and the water quality in Jinchang is hard, resulting in hardening of the pipeline; and Cu, Ni, Co Low recovery rate of heavy metals

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