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Composite microsphere adsorbent for treating ammonia nitrogen and heavy metal combined pollution wastewater in rare earth mining area as well as preparation method and application of composite microsphere adsorbent

A composite microsphere and composite pollution technology, which is used in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. Poor and other problems

Active Publication Date: 2021-06-22
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used adsorption materials for heavy metals and ammonia nitrogen pollution mainly include ion exchange resins, etc., but these adsorption materials are expensive, which limits their application.
Commonly used cheap ammonia nitrogen adsorption materials include zeolite, retortite, diatomite, activated carbon, etc., but for ammonia nitrogen and heavy metal compound polluted wastewater in rare earth mining areas, they cannot achieve a good adsorption effect. For example, zeolite has good adsorption performance for ammonia nitrogen, but It has poor adsorption capacity for heavy metals, while rectorite has good adsorption performance for heavy metals and extremely poor adsorption performance for ammonia nitrogen.
At the same time, rectorite has excellent dispersion and suspension performance in water bodies, which is not conducive to the separation of adsorption materials and sewage in practical applications in rare earth mining areas

Method used

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  • Composite microsphere adsorbent for treating ammonia nitrogen and heavy metal combined pollution wastewater in rare earth mining area as well as preparation method and application of composite microsphere adsorbent
  • Composite microsphere adsorbent for treating ammonia nitrogen and heavy metal combined pollution wastewater in rare earth mining area as well as preparation method and application of composite microsphere adsorbent
  • Composite microsphere adsorbent for treating ammonia nitrogen and heavy metal combined pollution wastewater in rare earth mining area as well as preparation method and application of composite microsphere adsorbent

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preparation example Construction

[0029] In terms of mass percentage, the composite microsphere adsorbent provided by the present invention for the treatment of ammonia nitrogen and heavy metal composite polluted wastewater in rare earth mining areas includes 40-60% of sodium zeolite, preferably 45-55%, more preferably 50-50%. 52%. In the present invention, the density of the sodium zeolite is preferably 1.5-3 g / cm 3 , the particle size is preferably 48 μm to 2 mm, more preferably 100 to 800 μm, and even more preferably 300 to 600 μm. The present invention has no special requirements on the source of the sodiumized zeolite, and can use the commercially available sodiumized zeolite in the field or prepare it by yourself. When the sodiumized zeolite is prepared by yourself, the preparation method preferably includes the following steps:

[0030] The sodium salt aqueous solution and the zeolite are stirred and mixed for solid-liquid separation, and the obtained solid is dried to obtain the sodium zeolite.

[00...

Embodiment 1

[0051] (1) Preparation of Sodium Zeolite

[0052] 50g natural clinoptilolite (material density is 2.13g / cm 3 ) into 500mL NaCl aqueous solution with a concentration of 1mol / L (the mass solid-to-liquid ratio of zeolite to NaCl aqueous solution is 1:10, stirred at 70°C for 2h, washed with water for 5 times, and dried at 105°C 12h, the sodium zeolite was obtained.

[0053] (2) Preparation of sodium humate modified rectorite

[0054] 50g rector mud (material density is 1.43g / cm 3 ) was added to 500mL sodium humate aqueous solution with a concentration of 8g / L, stirred at 70°C for 2h, washed with water for 5 times, and dried at 105°C for 12h to obtain sodium humate modified rector stone.

[0055] (3) Preparation of composite microsphere adsorbent for the treatment of ammonia nitrogen and heavy metal composite polluted wastewater in rare earth mining areas

[0056] Dissolve 19.2g of polyvinyl alcohol and 0.38g of sodium alginate completely in a water bath at 100°C. After coolin...

Embodiment 2

[0058] Dissolve 20g of polyvinyl alcohol and 0.5g of sodium alginate completely in a water bath at 100°C, and after cooling slightly, add 8g of sodium humate modified rectorite obtained in Example 1 and 24g of sodium zeolite obtained in Example 1, and stir evenly A viscous mixed solution of sodium zeolite / rectorite / polyvinyl alcohol / sodium alginate was obtained. Weigh 38g of boric acid and 10g of calcium chloride and add it to 1000mL of water to dissolve, and adjust the pH to neutral with anhydrous sodium carbonate, and use a syringe to mix sodium zeolite / sodium humate modified rectorite / polyvinyl alcohol / sodium alginate The mixed solution was slowly dropped into the boric acid / calcium chloride solution to prepare microspheres, continued to stir for 1 hour, then stood still for 24 hours, washed with water, and then dried at 50°C to obtain composite microspheres for the treatment of ammonia nitrogen and heavy metal composite polluted wastewater in rare earth mining areas Adsorb...

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Abstract

The invention provides a composite microsphere adsorbent for treating ammonia nitrogen and heavy metal combined pollution wastewater in a rare earth mining area as well as a preparation method and an application of the composite microsphere adsorbent, and belongs to the technical field of sewage treatment. The composite microsphere provided by the invention comprises a polyvinyl alcohol-sodium alginate cross-linked substance, sodium zeolite and sodium humate modified rectorite, wherein the sodium zeolite and the sodium humate modified rectorite are dispersed on the surface and inside the polyvinyl alcohol-sodium alginate cross-linked substance. According to the invention, the sodium humate modified rectorite and the sodium modified zeolite are used as adsorption materials together, and have a good removal effect on ammonia nitrogen and heavy metal ions. According to the invention, the polyvinyl alcohol and the sodium alginate cross-linked material are good clustering materials, and a three-dimensional interpenetrating network structure can be formed after cross-linking, so that the interlayer spacing of the rectorite and the pore channels of the zeolite can be improved, and the adsorption performance of the material on ammonia nitrogen and heavy metals can be further improved. The sodium modified zeolite and the sodium humate modified rectorite are prepared into the microsphere material, so that the problem that the rectorite suspends in water can be avoided, and the rectorite is easy to separate from wastewater.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a composite microsphere adsorbent for treating ammonia nitrogen and heavy metal composite polluted wastewater in rare earth mining areas, a preparation method and application thereof. Background technique [0002] The application of leaching agent ammonium sulfate in the mining of ionic rare earths and the associated heavy metal leakage in rare earth mining areas may cause combined pollution of ammonia nitrogen and heavy metals in the surface water of mining areas, among which heavy metal pollution is mainly cadmium ions and lead ions. At present, the main technology used in the treatment of ammonia nitrogen at the end of rare earth tail water is two-stage infiltration coupling biological method, and the pollution of heavy metals will cause harm to microorganisms, so it is necessary to intercept heavy metals at the front end of rare earth tail water; when intercepting hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/28021B01J20/267C02F1/285C02F1/286C02F2101/20Y02W10/10
Inventor 王兴祥王玉荣周志高丁昌峰王军锋
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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