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A method for deep adsorption and removal of phosphorus by using attapulgite loaded with hydrated iron oxide

A technology of hydrated iron oxide and attapulgite, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of difficult to achieve adsorption effect, high consumption, low adsorption capacity, etc., to achieve Effects of low operating cost, reduced treatment cost, and high adsorption performance

Active Publication Date: 2019-12-13
盛隆资源再生(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the consumption is large, and the material is generally in the form of powder, which is difficult to recycle and easily causes secondary pollution. Usually, only by loading it on a carrier with high mechanical strength can the actual operation and treatment effect be exerted.
Attapulgite is a natural nanostructured mineral material with nanochannel structure. It has a wide range of sources and low price. It has a very large specific surface area and ion exchange capacity, and has a certain adsorption capacity for phosphorus, but the adsorption capacity is very low and the removal rate is not high. , it is difficult to achieve the actual adsorption effect only through a single adsorption medium

Method used

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  • A method for deep adsorption and removal of phosphorus by using attapulgite loaded with hydrated iron oxide
  • A method for deep adsorption and removal of phosphorus by using attapulgite loaded with hydrated iron oxide
  • A method for deep adsorption and removal of phosphorus by using attapulgite loaded with hydrated iron oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Grind and sieve coarse attapulgite powder to obtain attapulgite powder with a mesh number of 80, add the powder to 1mol / L hydrochloric acid solution at a solid-to-liquid ratio of 1:2, stir and mix for 1 hour, then wash with water until neutral and filter out For the precipitate, vacuum dry the precipitate at 80°C for 10 hours and grind it into powder to obtain the purified attapulgite powder; mix ferric nitrate with the purified attapulgite powder in a ratio of 1:5, and add water at a solid-to-liquid ratio of 1:15 After stirring well, use 5wt% dilute ammonia water to adjust the pH of the solution until no precipitation occurs, filter out the precipitate after aging, wash repeatedly until neutral, and dry at 80°C for 10 hours to obtain a modified powder; the ratio is 1:0.1 :0.02 Mix the modified powder with glass powder binder and starch pore-forming agent evenly in solid phase, add water and ethanol (alcohol-water ratio 1:1) and stir to form a mass, age for 6 hours, use ...

Embodiment 2

[0045] Grind and sieve coarse attapulgite to obtain attapulgite powder with a mesh number of 90, add the powder to a 1.5mol / L hydrochloric acid solution at a solid-to-liquid ratio of 1:3, stir and mix for 1.5 hours, then wash with water until neutral Filter out the precipitate, vacuum-dry the precipitate at 90°C for 11 hours, and then grind it into powder to obtain purified attapulgite powder; mix ferric nitrate with purified attapulgite powder in a ratio of 1:8, and use a solid-to-liquid ratio of 1: 18 After adding water and stirring well, use 6.5wt% dilute ammonia water to adjust the pH of the solution until no precipitation occurs. After aging, filter out the precipitate, wash it repeatedly until neutral, and dry it at 90°C for 11 hours to obtain a modified powder; 1:0.2:0.04 Mix the modified powder with glass powder binder and starch pore-forming agent evenly in solid phase, add water and ethanol (alcohol-water ratio 1:1.5) and stir to form a dough, age for 7 hours, and use...

Embodiment 3

[0050] Grind and sieve coarse attapulgite to obtain attapulgite powder with a mesh number of 100, add the powder to 2mol / L hydrochloric acid solution at a solid-to-liquid ratio of 1:4, stir and mix for 2 hours, then wash with water until neutral and filter out For the precipitate, vacuum dry the precipitate at 100°C for 12 hours and grind it into powder to obtain the purified attapulgite powder; mix ferric nitrate with the purified attapulgite powder at a ratio of 1:10, and add water at a solid-to-liquid ratio of 1:20 After stirring well, use 8wt% dilute ammonia water to adjust the pH of the solution until no precipitation occurs, filter out the precipitate after aging, wash repeatedly to neutrality, and dry at 100°C for 12 hours to obtain a modified powder; the ratio is 1:0.25 :0.05 Mix the modified powder with glass powder binder and starch pore-forming agent in solid phase evenly, add water and ethanol (alcohol-water ratio 1:2) and stir to form a mass, age for 8 hours, use a...

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Abstract

The invention discloses a method for deep adsorption dephosphorization through ferric oxide hydrate-carrying attapulgite. The method comprises (1) preparing a ferric oxide hydrate-carrying attapulgite adsorbent with particle diameters of 2 to 6 mm through attapulgite purification, modification and granulation, and (2) filling an adsorption device with the adsorbent particles, making phosphorus-containing wastewater flow through a dephosphorization device, adjusting and controlling inlet and outlet water amounts to ensure standing time so that the adsorbent fully contacts with the phosphorus-containing wastewater and phosphorus is adsorbed and fixed to the surface of the adsorbent, and when the adsorbing capacity is saturated, carrying out soaking in a sodium hydroxide solution so that the adsorbent is regenerated. The adsorption synthesis process is simple and has strong operability. The adsorption device is simple and easy and realizes wastewater self-flowing treatment. The treated product water has a phosphorus concentration less than 0.1ppm. Under phosphorus removal total amount quantification, the wastewater discharge capability is increased. The adsorbent can be regenerated and recycled so that requirements of environmental protection are satisfied and a treatment cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of phosphorus-containing wastewater treatment, in particular to a method for deep phosphorus removal with a synthetic adsorbent. Background technique [0002] At present, as more and more domestic sewage and industrial wastewater are discharged into the water body, the degree of eutrophication of the water body is increasing day by day. For inland water bodies, phosphorus is the main limiting element for eutrophication. Therefore, strict control of pollution sources, treatment of discharged sewage, and reduction of phosphorus content in discharged sewage have become important solutions to prevent water eutrophication and water pollution control. [0003] Wastewater with high phosphorus concentration is generally treated by chemical precipitation, which has a high removal rate, but the operating cost is high, and a large amount of difficult-to-treat sludge is generated, which is easy to cause secondary pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/12B01J20/30C02F101/10
CPCB01J20/06B01J20/12C02F1/281C02F2101/105
Inventor 方稳郎超周欢欢钊现花
Owner 盛隆资源再生(无锡)有限公司
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