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

A hydrated iron oxide, deep purification technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Effects of adsorption selectivity and adsorption capacity

Active Publication Date: 2008-05-28
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] Put 50ml (approximately 40 grams) of HFO-D001 with D-001 as the matrix and a solid loading of Fe (calculated as Fe) of 10% into a jacketed glass adsorption column (Φ32×360mm), at 25± At 5°C, the heavy metal slightly polluted water (Pb 2+ At a concentration of 1ppm, Ca 2+ The concentration is 100ppm, K + The concentration is 100ppm, Na + The concentration is 100ppm, Mg 2+ The concentration is 100ppm) and the pH value is adjusted to 6, and the flow rate of 500ml / h passes through the resin bed layer, the processing capacity is greater than 20000BV, and the Pb in the water 2+ The concentration dropped below 2ppb.

[0019] Use 200ml of HCl with a concentration of 2% to desorb through the resin bed at a flow rate of 100ml / h at a temperature of 50±5°C. The desorption rate of heavy metals is >99.9%. The desorbed resin can be used as a load repeatedly. Carrier use.

Embodiment 2

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

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

Embodiment 3

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

[0025] Use 300ml of HCl with a concentration of 3% to desorb through the resin bed at a flow rate of 200ml / h at a temperature of 40±5°C. The desorption rate of heavy metals is >99.9%. The desorbed resin can be used as a load repeatedly. Carrier 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 environmental treatment. 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 by the 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 deep purification of heavy metal slightly polluted water by using resin-based nanometer hydrated iron oxide, more specifically a method for using resin-based nanometer hydrated iron oxide which has high adsorption capacity and selectivity for heavy metals such as lead, copper and cadmium A technology to deeply purify heavy metal slightly polluted water bodies. Background technique [0002] Due to the high toxicity and potential bioaccumulation of heavy metal pollution, the deep purification of heavy metal slightly polluted water is of great significance for water quality security. Correspondingly, countries around the world are developing new treatment technologies to meet more stringent heavy metal safety control standards. Among them, the adsorption separation technology has been widely concerned in this field because of its simple operation and strong universality. The commonly used adsorption separation materia...

Claims

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Application Information

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Patent Type & Authority Applications(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
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