Cellulose nanocrystalline loaded sodium alginate adsorbent and application thereof to enrichment of organic phosphorus in wastewater

A technology of sodium alginate and nanocrystals, applied in the field of environmental engineering, can solve the problems of increasing the difficulty and cost of printing and dyeing wastewater treatment plants, high stability, and difficult to remove

Active Publication Date: 2021-03-16
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, my country's printing and dyeing industry is developed, and a large amount of printing and dyeing wastewater is produced every year. Among them, thiol colorants represented by tris(2-carboxyethyl)phosphine (TCEP) are difficult to remove because of their good solubility and high stability. Significantly increase the difficulty and operating cost of printing and dyeing wastewater treatment plants

Method used

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  • Cellulose nanocrystalline loaded sodium alginate adsorbent and application thereof to enrichment of organic phosphorus in wastewater
  • Cellulose nanocrystalline loaded sodium alginate adsorbent and application thereof to enrichment of organic phosphorus in wastewater
  • Cellulose nanocrystalline loaded sodium alginate adsorbent and application thereof to enrichment of organic phosphorus in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Dehydration and drying of papermaking deinking sludge

[0050] 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 the muddy water mixed solution (set 6 parallel samples) under the premise of uniform stirring, and use it after centrifugation Phosphate buffer with a pH of 7.0 was repeatedly diluted 3 times, and finally the volume was adjusted to 500 mL. 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 another 3 groups of parallel samples, and add 5% of the sludge dry weight AlCl to the 500mL mud-water mixture successively. 3 and slaked lime which is 20% of the dry weight of the sludge, after 2 minute...

Embodiment 2

[0051] Example 2: Oxidation of papermaking deinking drying sludge and separation of cellulose nanocrystals

[0052] 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 0.2mmol of 2,2,6,6-tetramethylpiperidinium oxide radical (TEPMO) 80mg and 5.0mmol of NaBr 80mg in turn, after TEPMO and NaBr are completely dissolved, slowly add 10.0mmo / 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

[0053] Embodiment 3: the establishment of alginate-cellulose nanocrystal system

[0054] Under the slightly acidic condition provided by acetic acid, put 2g of sodium alginate into 100mL of acetic acid solution (pH=4.5), slowly add 50mL of dehydration filtrate of papermaking deinking sludge, and mix sodium alginate and dehydration filtrate under stirring condition The calcium ions are fully mixed and uniformly dispersed to form an alginate-acetic acid mixture. Dissolve 0.2 g of the prepared cellulose nanocrystals in 50 mL of acetic acid solution (pH=4.5), and slowly add them into the alginate-acetic acid mixture after stirring and mixing, and then the obtained alginate-cellulose nanocrystals 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 sodium alginate adsorbent and application thereof to enrichment of organic phosphorus in wastewater, and belongs to the technical field of environmental engineering. Papermaking deinking sludge is prepared into cellulose nanocrystals through a medicament conditioning-drying and crushing-chemical oxidation-microwave screening technology, and the cellulose nanocrystals are loaded on alginate under a weakly acidic condition, so that the cellulose nanocrystals have the capacity of enriching organic phosphorus in wastewater. By applying themethod, the content of organic phosphorus in the wastewater can be remarkably reduced, the total phosphorus of effluent is reduced, and up-to-standard discharge of sewage treatment is guaranteed; andthe enriched organophosphorus can be subjected to resource recovery of phosphorus in an incineration manner. 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 sodium alginate adsorbent and its application for enriching organic phosphorus in wastewater, 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 paper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28C02F1/28C02F101/30
CPCB01J20/24B01J20/28004C02F1/286C02F2101/30B01J20/28007B01J20/3021B01J20/3071B01J20/3078C02F11/06C02F11/13C02F11/145C02F2103/28B01J20/3212B01J20/3272C02F9/00B01J20/3085
Inventor 王硕刘奇欣沈斐李激王勇衣雪松
Owner JIANGNAN UNIV
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