Method for recycling heavy metal ion in water body by utilizing ion chelate fiber

Abstract

The invention relates to a method for recycling heavy metal ion in water body by utilizing ion chelate fiber, belonging to the environmental protection technical field. Ion chelate fiber is prepared into a reaction module; the prepared reaction module is arranged in absorption region of water body to be treated for absorption; the reaction module enters into regeneration region to be regenerated after completing absorption in the absorption region, and the regeneration region includes pickling, washing, alkali regeneration and washing sequentially; after regeneration is completed, the reaction module returns to the absorption region to complete one cycle and then continues absorption, thus forming the continuous process of absorbing and recycling heavy metal ion by the reaction module. The water discharged after the process meets the requirement of 'integrated wastewater discharge standard'. The invention has fast absorption speed, high absorption capacity and high treatment efficiency; elution speed in pickling process is fast, and regeneration speed is fast; the heavy metal ion recycling technology of the invention is simple, equipment is easy to operate, total energy consumption of the process is low, investment is less, and quick returns can be obtained.

Description

technical field [0001] The invention relates to a method for absorbing and recovering heavy metal ions in water by using ion chelating fibers, which belongs to the technical field of environmental protection. Background technique [0002] With the development of electroplating, mining, smelting, electronics, chemical industry and other industries, the application of heavy metals is becoming more and more extensive, and the discharge of heavy metal wastewater is also increasing. Excessive heavy metals are extremely harmful to the human body. For example, excessive trivalent chromium can easily accumulate in the alveoli and cause lung cancer; excessive copper can promote liver cirrhosis; excessive nickel can cause headaches, nausea, even high fever, and difficulty breathing. Therefore, the treatment of heavy metal wastewater has attracted more and more attention, and the treatment technology of heavy metal wastewater has also been continuously developed. [0003] For the trea...

AI Technical Summary

Problems solved by technology

The chemical precipitation method is used to treat heavy metal wastewater. The process is simple, the technology is mature, the treatment cost is low, and the adaptability is strong. The disadvantage is that it occupies a large area and produces heavy metal sludge. If the sludge is not properly treated, it will cause secondary pollution.

The electrolysis process is simple, the floor space is small, and the recovered metals are of high purity, but the electrolysis method consumes a lot of electricity and the effluent quality is poor, so it is suitable for the treatment of high-concentration wastewater

Chinese patent CN1904142 discloses a method for extracting copper from etching waste liquid or low-copper-containing wastewater, using an extractant to extract copper-containing wastewater. This method is simple to operate and can recover copper. The disadvantage is that the regeneration of the extractant is inconvenient and the cost is high.

Adsorption method is used to treat wastewater containing heavy metals. The adsorbent has a wide range of sources, low cost, convenient operation and good adsorption effect, but the service life of the adsorbent is short, regeneration is difficult, and heavy metal ions are difficult to recover.

Ion exchange method is a method that has developed rapidly in recent years, but one of its main exchange materials—ion exchange resin has high cost, slow adsorption rate and certain restrictions on water quality. For example, organic matter and oxides in wastewater will Make the resin invalid, etc., and its application also has certain limitations

[0004] In addition, most of the above methods are to treat industrial wastewater before it is discharged, so that the heavy metal content reaches the discharge target, while for natural water bodies that have been polluted by heavy metal ions, such as ponds and lakes polluted by industrial wastewater and near heavy metal deposits Surface water, etc., there is no suitable method and equipment for treatment