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Method for deep purifying heavy metal micro-polluted water by resin-base nano hydrated ferric oxide

A technology of hydrated iron oxide and deep purification, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as high pressure and difficult industrial application, and achieve large processing capacity and enhanced The effect of adsorption selectivity and adsorption capacity

Active Publication Date: 2010-06-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrated iron oxide generally exists in ultrafine particles (about 0.02-10 microns in size), and when it is directly applied to a fluid system, it will cause a huge pressure drop, making it difficult to directly realize industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 50ml (about 40 grams) of HFO-D001 with D-001 as the parent and the solid loading of Fe (as Fe) as 10% was loaded into a jacketed glass adsorption column (Φ32×360mm), at 25± At 5°C, the heavy metal micro-polluted water body (Pb 2+ The concentration is 1ppm, Ca 2+ The concentration is 100ppm, K + The concentration of 100ppm, Na + The concentration of 100ppm, Mg 2+ The pH value of 100ppm) was adjusted to 6, passed through the resin bed at a flow rate of 500ml / h, the treatment capacity was greater than 20000BV, and the effluent Pb 2+ The concentration dropped below 2ppb.

[0019] Use 200ml of HCl with a concentration of 2% at a temperature of 50±5℃ and a flow rate of 100ml / h to pass through the resin bed for desorption, the desorption rate of heavy metals is >99.9%, and the desorbed resin can be repeatedly used as a Carrier parent use.

Embodiment 2

[0021] 50ml (about 40 grams) of HFO-D001 with D-001 as the parent and the solid loading of Fe (as Fe) of 12% was loaded into a jacketed glass adsorption column (Φ32×360mm), at 35± At 5 °C, the heavy metal micro-polluted water (Cu 2+ The concentration is 1ppm, Ca 2+ The concentration of 100ppm, Na + The concentration of 100ppm, Mg 2+ The pH value of 100ppm) was adjusted to 6, passed through the resin bed at a flow rate of 500ml / h, the treatment capacity was greater than 10000BV, and the effluent Cu 2+ The concentration dropped below 2ppb.

[0022] Use 200ml of HCl with a concentration of 2% at a temperature of 50±5℃ and a flow rate of 80ml / h to pass through the resin bed for desorption. The desorption rate of heavy metals is >99.9%, and the desorbed resin can be used as a carrier repeatedly. Carrier parent use.

Embodiment 3

[0024] 100ml (about 79 grams) of HFO-D001 with D-001 as the parent and Fe solid loading (as Fe) of 8% was loaded into a jacketed glass adsorption column (Φ32×360mm), at 15± At 5°C, the heavy metal micro-polluted water (Cd 2+ The concentration is 1ppm, Ca 2+ The concentration of 100ppm, Na + The concentration of 100ppm, Mg 2+ The pH value of 100ppm) was adjusted to 7, and the flow rate of 500ml / h passed through the resin bed, the treatment capacity was greater than 7000BV, and the effluent Cd 2+ The concentration dropped below 3ppb.

[0025] Use 300ml of HCl with a concentration of 3% at a temperature of 40±5℃ and a flow rate of 200ml / h to pass through the resin bed for desorption. The desorption rate of heavy metals is >99.9%, and the desorbed resin can be repeatedly used as a Carrier parent use.

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Abstract

The invention discloses a method of deeply purifying heavy metal micro-polluted water body through resin-based nano hydrated ferric oxide, which pertains to the technical field of water environmentaltreatment. The steps are: nano hydrated ferric oxide granules are supported on cation exchange resin so as to generate the resin-based nano hydrated ferric oxide materials; the water micro-polluted bythe heavy metal passes through an absorption column which is filled with the resin-based nano hydrated ferric oxide or the heavy metal micro-polluted water and the resin-based nano hydrated ferric oxide are mixed in a container and then are vibrated before being centrifugally dried; the absorbed resin-based nano hydrated ferric oxide can be desorbed by acid fluid such as HC1or HNO3 solution etc.or can be desorbed and regenerated by EDTA solution. When a great number of cations such as Na<+>, k<+>, Ca<2+>, Mg<2+>, etc. exist in the polluted water, the invention still can reduce and lead the effluent heavy metal concentration to meet safety control standard; when a great number of competitive cations coexist in the heavy metal micro-polluted water, the effluent heavy metal concentration can be reduced to meet the safety control standard with very large treatment capacity.

Description

technical field [0001] The invention relates to a method for deeply purifying heavy metal micro-polluted water bodies by utilizing resin-based nanometer hydrated iron oxide, and more particularly to a method utilizing resin-based nanometer hydrated iron oxide with high adsorption capacity and selectivity for heavy metals such as lead, copper and cadmium. Technology to deeply purify heavy metal micro-polluted water bodies. Background technique [0002] Due to the high toxicity and potential bioaccumulation of heavy metal pollution, the deep purification of heavy metal micro-polluted water bodies is of great significance for water quality security. Correspondingly, countries around the world are developing new treatment technologies to adapt to more stringent heavy metal safety control standards. Among them, adsorption separation technology has received extensive attention in this field due to its simple operation and strong universality. Commonly used adsorption separation ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F1/62
Inventor 潘丙才潘丙军张炜铭张庆建张庆瑞蒋佩娟张全兴
Owner NANJING UNIV