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Method for removing heavy metal ions in wastewater through ion exchange resin and resin regeneration method

A technology of ion exchange resin and heavy metal ions, which is applied in ion exchange water/sewage treatment, ion exchange bed cleaning/rinsing, chemical instruments and methods, etc., can solve the problem of high cost of heavy metal ions, reduce the consumption of chemicals, and facilitate fixing Effect

Active Publication Date: 2019-08-13
JIANGSU NJU ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of the high cost of using selective adsorption cation exchange resins with specific chelating groups to treat heavy metal ions, the present invention provides a method for removing heavy metal ions in wastewater by using ion exchange resins and a resin regeneration method, which can Realize the efficient removal and recovery of heavy metals in the environment with / without alkali (earth) metal interfering ions, and realize the harmless treatment and resource control of toxic and harmful heavy metals in wastewater

Method used

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  • Method for removing heavy metal ions in wastewater through ion exchange resin and resin regeneration method
  • Method for removing heavy metal ions in wastewater through ion exchange resin and resin regeneration method
  • Method for removing heavy metal ions in wastewater through ion exchange resin and resin regeneration method

Examples

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Effect test

Embodiment 1

[0046] 20mL strong basic anion exchange resin (NDA-900, specific surface is 20.0~100.0m 2 / g, the exchange capacity is 0.5~2.5mmol / g, Jiangsu Nanda Environmental Protection Technology Co., Ltd.) into a jacketed glass adsorption column (Φ32×360mm). At room temperature (20.0° C.), chloride ions were added to the solution containing heavy metal ions such as zinc, cadmium, mercury, lead, and copper (see Table 1) after precipitation pretreatment (adjusting the mass percentage of chlorine in the mixed solution to be 10%) ) to make heavy metal ions all form complex anions with chloride ions, pass the waste water through the NDA-900 bed at a flow rate of 1.0BV / h, and the waste water treatment capacity is at least 3500.0BV / batch, and the specific inlet and outlet water quality in embodiment 1 The situation is shown in Table 1.

[0047] Table 1 Resin column inlet and outlet water quality

[0048]

[0049]

[0050] Note: The reference implementation standard in the above table is...

Embodiment 2

[0053] Put 20mL of strongly basic anion exchange resin (NDA-900) into a jacketed glass adsorption column (Φ32×360 mm). In addition to heavy metal ions, wastewater also contains Na + Concentration greater than 10mg / L, Ca 2+ The concentration is greater than 10mg / L. At room temperature (20.0°C), adjust the chloride ion concentration in the wastewater containing zinc, cadmium, mercury, lead, copper and other heavy metal ions and sodium and calcium ions after precipitation pretreatment, so that the mixed solution The mass percent content of chlorine is 8%, and the wastewater that forms complex anions passes through the NDA-900 bed at a flow rate of 3.0BV / h, and the wastewater treatment capacity is at least 3500.0BV / batch. The specific inlet and outlet water quality in embodiment 2 The situation is shown in Table 2.

[0054] Table 2 Resin column inlet and outlet water quality

[0055]

[0056] Note: The reference implementation standard in the above table is the Class IV wate...

Embodiment 3

[0059] Adsorption treatment adopts the same process as Example 1, and results similar to Example 1 can be obtained.

[0060] Using FeCl 3 , NaCl, hydrochloric acid reagents to prepare FeCl 4 - Desorbing agent, the content of iron element in the desorbing agent is FeCl 3 The calculation is that the volume fraction is about 5.0%; the NaCl mass fraction is about 5.5%; the pH value is about 3.0, using 3.0BV compound desorption agent + 2.0BV demineralized water in turn, passing through the above NDA at a flow rate of 2BV / h at 30°C The -900 bed is desorbed and washed for regeneration, and the desorption rate of complex metal ions reaches 99.0%; the resin regeneration rate after soft water desorption reaches more than 99%. The high-concentration desorption solution contains a large amount of ions of metal elements such as zinc, cadmium, mercury, lead, copper and iron, and adjusts the pH value of the solution to 8-12, so that the ions of the aforementioned heavy metal elements form...

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Abstract

The invention discloses a method for removing heavy metal ions in wastewater through ion exchange resin and a resin regeneration method and belongs to the technical field of environmental protection.The method comprises the following steps that 1, the concentration of Cl- in wastewater with heavy metal ions Mn+ is adjusted, so that the heavy metal ions are transformed into Mn+-Cl type stable complexation negative ions; 2, negative ion exchange resin is adopted for adsorbing the Mn+-Cl type complexation negative ions in the transformed wastewater; 3, a FeCl4- solution is adopted for desorbingthe negative ion exchange resin adsorbing the Mn+-Cl complexation negative ions; 4, the pH value of a desorption solution generated in the third step is adjusted until a metal hydroxide precipitate isformed through Mn+, and through solid-liquid separation, solids are taken as dangerous solid waste for treatment; ferric chloride is added to a supernate, the pH is adjusted, and the FeCl4- solutionis prepared for application in the third step. According to the method, the aim is achieved successfully that heavy metal ions in the wastewater with interference ions are removed with low cost underthe industrial scale. Regeneration is complete, and the service life of the resin is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of resin regeneration, more specifically, relates to a method for removing heavy metal ions in wastewater by using ion exchange resins and a resin regeneration method, and is a regeneration treatment method for strongly basic anion exchange resins in the field of water treatment . Background technique [0002] Inorganic ionic pollutants such as heavy metals accumulated to a certain limit in the water body will cause serious harm to the water body, aquatic plants, aquatic animals and other ecosystems, and may affect human health through the food chain. The deep purification of objects has been paid more and more attention by people. According to literature reports and engineering investigations, the treatment methods for heavy metal pollutants in water at home and abroad usually use chemical precipitation first, and then use cationic adsorbents to check. [0003] When the wastewater contains a high concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F9/04B01J49/60C02F101/20
CPCC02F1/42C02F9/00B01J49/60C02F2101/20C02F2001/422C02F2001/007C02F1/66
Inventor 王宁吕振华张炜铭朱兆坚赵昕林原周兵翟廷婷阮志伟郭孝虎
Owner JIANGSU NJU ENVIRONMENTAL TECH
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