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Cellulose nanocrystalline loaded chitosan adsorbent and application thereof in recycling rare earth elements in sewage

A technology for loading chitosan and nanocrystals, which is applied in the field of environmental engineering and can solve the problems of increasing the cost of incineration ash treatment and inhibiting the biological activity of activated sludge.

Active Publication Date: 2021-03-19
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of rare earth elements not only inhibits the biological activity of activated sludge, but also generally adsorbs or precipitates on activated sludge in sewage, which increases the treatment cost of incineration ash after sludge incineration disposal

Method used

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  • Cellulose nanocrystalline loaded chitosan adsorbent and application thereof in recycling rare earth elements in sewage
  • Cellulose nanocrystalline loaded chitosan adsorbent and application thereof in recycling rare earth elements in sewage
  • Cellulose nanocrystalline loaded chitosan adsorbent and application thereof in recycling rare earth elements in sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Dehydration and drying of papermaking deinking sludge

[0051] Obtain 10L of papermaking deinking sludge mixed solution from the deinking wastewater treatment process section of the papermaking wastewater treatment site (a paper mill in Jiaxing), take out 500ml of muddy water mixed solution (6 parallel samples are set) under the premise of uniform stirring, and use it after centrifugation Phosphate buffer with pH 7.0 was repeatedly diluted 3 times, and finally the volume was adjusted to 500ml. Three groups of parallel samples were taken out, and after suction filtration, the sludge samples retained on the filter membrane were placed in an oven and dried at 105°C for 4 hours, and then the dry weight of the papermaking deinking sludge was calculated. Take out other 3 groups of parallel samples, add to 500ml mud-water mixture successively the FeCl3 that is sludge dry weight 5% and the slaked lime that is sludge dry weight 20%, through 2min fast stirring (rotatin...

Embodiment 2

[0052] Example 2: Oxidation of papermaking deinking drying sludge and separation of cellulose nanocrystals

[0053] Select the crushed papermaking deinking and drying sludge in the parallel sample, rinse the crushed sludge with a phosphate buffer solution with a pH of 7.0, make the volume of the mixed solution reach 100ml, and keep stirring at a speed of 150r / min , add 60mg of 0.2mmol of 2,2,6,6-tetramethylpiperidinium oxide radical (TEPMO) and 80mg of 5.0mmol of NaBr in turn, after TEPMO and NaBr are completely dissolved, slowly add 8.0mmo / L of NaClO solution until the pH of the reaction system does not change, then stop the reaction with a slight excess of absolute ethanol, and finally obtain cellulose nanocrystals through microwave separation and centrifugal precipitation.

Embodiment 3

[0054] Embodiment 3: the establishment of chitosan-cellulose nanocrystal system

[0055] Under the slightly acidic condition provided by acetic acid, put 2g of low-viscosity chitosan (viscosity lower than 0.22Pa·s) into 100mL of acetic acid solution (pH=4.0), and keep stirring under the condition of rotating speed of 150r / min to make it appear Uniformly dispersed state to form chitosan-acetic acid mixture. Dissolve 0.2 g of the prepared cellulose nanocrystal in 100 mL of acetic acid solution (pH=4.0), slowly add it into the chitosan-acetic acid mixture after stirring and mixing, and then mix the obtained chitosan-cellulose nanocrystal The crystal mixture was dried in an oven at low temperature (75° C.) for 24 hours, and the moisture was balanced for later use.

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Abstract

The invention discloses a cellulose nanocrystalline loaded chitosan adsorbent and application thereof in recycling rare earth elements in sewage, and belongs to the technical field of environmental engineering. Papermaking deinking sludge is prepared into cellulose nanocrystals through a medicament conditioning, drying, crushing, chemical oxidation and microwave screening technology, and the cellulose nanocrystals are loaded on chitosan under a weakly acidic condition, so that the cellulose nanocrystals have the effect of recovering rare earth elements in sewage. By applying the method, the influence of the existence of rare earth elements on the biological activity of the sludge can be remarkably reduced, and up-to-standard discharge of sewage treatment is ensured; and the obtained rare earth elements can be recycled for resource utilization after being enriched. Meanwhile, the papermaking deinking sludge is used for preparing high-added-value products, the application range of the papermaking deinking sludge is widened, and high feasibility is achieved.

Description

technical field [0001] The invention relates to a cellulose nanocrystal-loaded chitosan adsorbent and its application in recycling rare earth elements from sewage, belonging to the technical field of environmental engineering. Background technique [0002] In the context of resource advantage utilization, waste paper is used as papermaking raw material for paper production, so a large amount of papermaking deinking sludge will be generated. Papermaking deinking sludge has a high inorganic ash content and is easy to dehydrate. At the same time, because it contains a large amount of cellulose substances, it is generally used as an auxiliary fuel for municipal sludge incineration. Doing so will not only increase the difficulty of sludge incineration and disposal, but also cause waste of resources in papermaking deinking sludge. Therefore, it is very necessary to make resource utilization of papermaking deinking sludge according to the properties and components of papermaking de...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C22B59/00C22B7/00
CPCB01J20/24B01J20/28007C02F1/286C22B7/005C22B7/006C22B59/00Y02P10/20
Inventor 王硕冯萱郑国臣李激衣雪松王勇
Owner JIANGNAN UNIV
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