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Method for treating VA-family element oxygen-containing negative ion wastewater through resin adsorption/desorption-diffusion dialysis

A technology of diffusion dialysis and resin adsorption, applied in the direction of osmosis/dialysis water/sewage treatment, special treatment targets, chemical instruments and methods, etc., to achieve the effect of saving procedures and costs, reducing costs, and reducing waste liquid pollution

Inactive Publication Date: 2018-06-29
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For the oxyanion wastewater containing VA elements in the prior art, the anion exchange resin loaded with nano oxides can only be desorbed and regenerated with an alkaline solution after adsorption, and the obtained desorption solution contains high concentrations of alkali and phosphorus, arsenic or antimony. It is not suitable for the problem of directly separating alkali from phosphorus, arsenic or antimony by chemical precipitation. The present invention provides a method for resin adsorption and desorption-diffusion dialysis to treat oxyanion wastewater containing VA elements. The desorption liquid is treated by diffusion dialysis. Phosphorus, arsenic or antimony are separated as solid waste or by-products, and the separated alkali can be reused in the desorption regeneration process

Method used

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  • Method for treating VA-family element oxygen-containing negative ion wastewater through resin adsorption/desorption-diffusion dialysis
  • Method for treating VA-family element oxygen-containing negative ion wastewater through resin adsorption/desorption-diffusion dialysis
  • Method for treating VA-family element oxygen-containing negative ion wastewater through resin adsorption/desorption-diffusion dialysis

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Embodiment 1

[0039] A method for resin adsorption-desorption-diffusion dialysis treatment of wastewater containing phosphate anions, the steps of which are:

[0040] (A) phosphate ion content, pH value are as shown in table 1 containing phosphate (PO4 3- ) The waste water passes through the NDA-P type resin column at a rate of 1BV / h-20BV / h to saturate the resin adsorption;

[0041] (B) At normal temperature, under the condition of pH 8-10, add 5%-10% sodium hydroxide solution as desorption in the NDA-P type resin of adsorption breakthrough at a rate of 0.5BV / h-2BV / h agent to regenerate the resin and produce a desorption solution;

[0042] (C) The desorption solution and water containing phosphate ion and sodium hydroxide from step (B) are respectively added to the desorption solution injection port and the water injection port of the diffusion dialyzer using NDADFC1 cation exchange membrane, the desorption solution and the water injection port The flow rate ratio of the water is 1:1.10-1...

Embodiment 2

[0049] A method for resin adsorption-desorption-diffusion dialysis treatment of arsenate-containing wastewater, the steps of which are:

[0050] (A) Pass the arsenate-containing wastewater with arsenate ion content and pH value as shown in Table 2 at a rate of 1BV / h-20BV / h for 2h through the NDA-As type resin column to saturate the resin adsorption;

[0051] (B) At normal temperature and pH 4-10, add 5%-10% sodium hydroxide solution at a rate of 0.5BV / h-2BV / h in the NDA-As resin that has penetrated through adsorption as desorption agent to regenerate the resin;

[0052] (C) The desorption solution and water containing arsenate ion and sodium hydroxide from step (B) are respectively added to the desorption solution injection port and the water injection port of the diffusion dialyzer using NDADFC2 cation exchange membrane, the desorption solution and the water injection port The flow rate ratio of the water is

[0053] 1:1.12-1:1.70, wherein the desorption solution is 100L / h-...

Embodiment 3

[0058] A method for resin adsorption-desorption-diffusion dialysis treatment of oxygen-anion wastewater containing VA group elements, the steps are:

[0059] (A) Pass the wastewater containing oxyanions of VA group elements through the resin to saturate the resin; that is, the concentration of oxyanions of VA group elements is 0.5mg / L-5mg / L. In specific implementation, 0.5mg / L, 1mg can be selected / L, 1.2mg / L, 2.5mg / L, 4.2mg / L or 5mg / L and other values; pH is 4-10 (in specific implementation, you can choose 4, 5, 6, 7, 8, 9 or 10, etc. Numerical value) waste water with 1BV / h-20BV / h (during specific implementation, can select 1,20,12,6 or 2 etc. numerical value) rate to pass through resin, total 1000BV-5000BV (during specific implementation, can select 1000,1200, 3600, 4800 or 5000 etc.), to saturate the resin adsorption;

[0060] Wherein, the oxyanions of group VA elements in this embodiment can be one or more of phosphate, phosphite, arsenate, arsenite or antimonate;

[006...

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Abstract

The invention discloses a method for treating VA-family element oxygen-containing negative ion wastewater through resin adsorption / desorption-diffusion dialysis, belongs to the field of wastewater treatment and resource reuse, and particularly relates to a recycling method of wastewater containing phosphate radicals, phosphite radicals, arsenate radicals, arsenite radicals and antimonate radicals.The method comprises the following steps: adsorbing the VA-family element oxygen-containing negative ion wastewater by using resin; subsequently performing desorption regeneration on the resin by using an alkali solution, and then separating VA-family element oxygen-containing negative ions from alkali liquor by using a diffusion dialysis method, wherein the alkali liquor can be recycled and applied in the desorption regeneration step. According to the method disclosed by the invention, besides that VA-family element oxygen-containing negative ions are separated and enriched, the alkali liquor can be recycled and applied again, and finally, the concentration of the VA-family element oxygen-containing negative ions in discharged water is reduced to 0.01mg / L or below, so that production cost and environmental pollution are greatly reduced, a current national energy conservation and emission reduction industrial policy can be met, and the method is suitable for being industrially popularized.

Description

technical field [0001] The invention belongs to the field of waste water treatment and recycling, and relates to a recycling method for VA group element oxygen-containing salts and alkalis in a resin desorption solution, in particular to a resin adsorption-desorption-diffusion dialysis treatment Method for wastewater containing oxyanions of group VA elements. Background technique [0002] With the development of the industrial and mining industry and the acceleration of urbanization, the wastewater generated in the process of heavy metal mining, smelting, processing, electronic plating, leather making, etc. often contains VA elements such as phosphorus, arsenic, and antimony. Among them, phosphorus is one of the key elements leading to eutrophication of water bodies, while arsenic and antimony are typical toxic and harmful elements. They have severe toxicity to the environment, organisms and humans, and can cause acute poisoning, subacute poisoning, chronic poisoning, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/52C02F1/44C02F1/42C02F2303/16
Inventor 张炜铭刘扬潘丙才吕路赵昕花铭张延扬李丽芳
Owner NANJING UNIV
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