Ammonia nitrogen adsorbent and preparation method and application method thereof

An adsorbent, ammonia nitrogen technology, applied in the field of environmental engineering, can solve the problems of slow growth of nitrifying bacteria, high price of chemical reagents, huge treatment facilities, etc., to achieve stable effluent water quality, easy analysis and regeneration, good economic and environmental benefits.

Inactive Publication Date: 2010-07-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with the biological method is that due to the slow growth of nitrifying bacteria and the long reaction time required, the ammonia nitrogen load in the treatment process is low and the treatment facilities are huge. Although the research on the new biological denitrification process has made some progress, it still cannot fundamentally solve the above problems
The most important factor affecting the practical application of chemical precipitation is due to the precipitation of NH 4 + The required chemical reagents (magnesium salt and phosphate) are expensive and unaffordable

Method used

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  • Ammonia nitrogen adsorbent and preparation method and application method thereof
  • Ammonia nitrogen adsorbent and preparation method and application method thereof
  • Ammonia nitrogen adsorbent and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 1 L of the chelating resin shown in structural formula 3 fully soaked in pure water with 2 L of 1 mol / L copper sulfate saturated solution, stir and react for 30 minutes, backwash the copper ions on the surface of the resin with pure water, and bake the resin at 40 ° C. After drying for 48 hours, the ammonia nitrogen adsorbent was obtained.

[0034] 30g of ammonia nitrogen adsorbent (dry) was filled into the ion exchange column, and the ammonia nitrogen concentration was 840mg / L ammonia solution through the exchange column at a flow rate of 5mL / min, figure 1 The ammonia nitrogen outflow curve is given.

[0035] Put the saturated ammonia nitrogen adsorbent into a container filled with 100mL of pure water, gradually add 1mol / L hydrochloric acid, when the pH of the solution drops to 2-6, preferably 3-5, stop adding acid, and after analysis The ammonia nitrogen adsorbent was repacked for use. The desorption liquid can be used repeatedly for the desorption of the ammoni...

Embodiment 2

[0038] Mix 1 L of the chelating resin shown in structural formula 3 fully soaked in pure water with 2 L of 1 mol / L zinc sulfate saturated solution, stir for 30 minutes, backwash the zinc ions on the surface of the resin with pure water, and dry the resin at 40 ° C. After drying for 48 hours, the ammonia nitrogen adsorbent was obtained.

[0039] 30g of ammonia nitrogen adsorbent (dry) was filled into the ion exchange column, and the ammonia nitrogen concentration was 840mg / L ammonia solution through the exchange column at a flow rate of 5mL / min, figure 2 The ammonia nitrogen outflow curve is given.

[0040] Put the saturated ammonia nitrogen adsorbent into a container filled with 100mL of pure water, and gradually add 1mol / L hydrochloric acid. When the pH of the solution drops to 2-6, preferably 3-5, stop adding acid. The ammonia nitrogen adsorbent was repacked for use. The desorption liquid can be used repeatedly for the desorption of the ammonia nitrogen saturated resin. W...

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Abstract

The invention discloses an ammonia nitrogen adsorbent and a preparation and application method thereof. The method comprises the following steps: loading transition metal ions Cu<2+>, Zn<2-> and the like on cation exchange resin to form cation exchange resin loaded with transition metal ions; using cation exchange resin loaded with transition metal ions as the ammonia nitrogen adsorbent to remove ammonia nitrogen in wastewater through ion exchange; after adsorption, using hydrochloric acid or sulphuric acid to desorb the saturated resin and regenerate the resin, wherein ammonia enters the solution in ammonium chloride or ammonium sulfate form; and evaporating and crystallizing the desorption solution to obtain ammonium chloride and recycling ammonium chloride. The ammonia nitrogen adsorbent of the invention has high adsorption capacity, stable adsorption capacity and convenient regeneration method; as the ammonia nitrogen adsorbent of the invention is used to treat ammonia nitrogen wastewater, the defects of cost and denitrification efficiency in the blow-off method, the biological denitrification method, the zeolite adsorption method and the chemical precipitation method are overcome; and the technology is simple, economical, efficient and environmentally friendly and is applicable to the treatment of ammonia nitrogen wastewater.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and relates to a kind of ammonia nitrogen adsorbent and its preparation and use method. Background technique [0002] Ammonia nitrogen is an important pollutant that causes water eutrophication and pollutes the environment. At present, in almost all polluted waters in China, ammonia nitrogen is one of the main pollutants. Water pollution, especially water eutrophication, has become an economic important factors for development. How to treat ammonia nitrogen wastewater efficiently and at low cost is an important problem faced by environmental workers. [0003] At present, the commonly used ammonia nitrogen wastewater treatment methods include stripping method, biological denitrification method, zeolite adsorption method and chemical precipitation method. The stripping method is to convert high-concentration ammonia-nitrogen into free ammonia under alkaline conditions, and use air (or ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J45/00C02F1/42C02F101/16
Inventor 周康根彭佳乐胡元娟张慧卿何俊俊
Owner CENT SOUTH UNIV
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