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Method for separating heavy metals lead and cadmium by using biological adsorbent packed column

A biosorbent and packed column technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of poor adsorption selectivity, low adsorption capacity, and limited application of biosorbents, etc. problems, to achieve the effect of large adsorption capacity, simple production method and convenient operation

Active Publication Date: 2013-01-02
湖北威辰环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these unmodified biosorbents have low adsorption capacity and poor adsorption selectivity, which limit the application of biosorbents in actual wastewater treatment.

Method used

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  • Method for separating heavy metals lead and cadmium by using biological adsorbent packed column
  • Method for separating heavy metals lead and cadmium by using biological adsorbent packed column
  • Method for separating heavy metals lead and cadmium by using biological adsorbent packed column

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1. Prepare the biosorbent packed column of the present invention: add 15.0 g of pyromellitic dianhydride to 500 mL of N,N-dimethylformamide, ultrasonically dissolve it under airtight conditions, add 10.0 g of it after drying The crushed corn stalks were reacted at 70°C for 4 h and then centrifuged. The product was washed several times with deionized water and 0.1 mol / L NaOH solution. After centrifugation, the product was dried in an oven at 60°C for 12 h to obtain hydroxyl surface-modified corn. straw. 1.5 g of hydroxyl surface-modified corn stalks were filled into a chromatographic column (inner diameter 1.0 cm, length 20 cm) by wet packing method to make an adsorption packed column.

Embodiment 2

[0023] 1. Prepare the biosorbent packed column of the present invention: add 15.0 g of pyromellitic dianhydride into 500 mL of N,N dimethylformamide, dissolve it ultrasonically under airtight conditions, add 10.0 g after it is completely dissolved, and dry and pulverize The corn stalks were reacted at 70°C for 4 h and then centrifuged. The product was washed several times with deionized water and 0.1 mol / L NaOH solution. After centrifugation, the product was dried in an oven at 60°C for 12 h to obtain modified corn stalks. 3.0 g of modified corn stalks were packed into a chromatographic column (inner diameter 1.5 cm, length 30 cm) by wet packing method to make an adsorption packed column.

[0024] 2. Application example: biosorbent packed column for Pb 2+ 、Cd 2+ adsorption separation

[0025] Configured with Pb 2+ 200 mg / L, Cd 2+ 100 mg / L of simulated wastewater was counter-flowed into the packed column through a peristaltic pump at room temperature. The chromatographic...

Embodiment 3

[0027] 1. Prepare the biosorbent packed column of the present invention: add 15.0 g of ethylenediaminetetraacetic acid dianhydride to 500 mL of N, N dimethylformamide, ultrasonically dissolve it under airtight conditions, add 10.0 g of it after drying The crushed corn stalks were reacted at 70°C for 4 h and then centrifuged. The product was washed several times with deionized water and 0.1 mol / L NaOH solution. After centrifugation, the product was dried in an oven at 60°C for 12 h to obtain modified corn stalks. 4.0 g of modified corn stalks were filled into a chromatographic column (inner diameter 2 cm, length 30 cm) by wet packing method to make an adsorption packed column.

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Abstract

The invention relates to a method for separating heavy metals lead and cadmium by using a biological adsorbent packed column. The method comprises the following steps: filling hydroxyl surface modified straws into a chromatographic column by a wet packing method; refluxing wastewater containing heavy metals lead and cadmium by a peristaltic pump to the packed column for dynamic adsorption, and recycling an effluent; eluting the packed column with 0.2mol / L EDTA eluant; recycling the eluant; and separating the lead and cadmium by monitoring concentration of lead ion and cadmium ion in the effluent and eluant. The eluted packed column can be used repeatedly. The invention has the following beneficial effects: (1) hydroxyl surface modified straw packed column has large adsorption capacity to heavy metals lead and cadmium, and can effectively separate the lead and cadmium; (2) the biological adsorbent has extensive sources, and is cheap and easily available; (3) the packed column can be simply manufactured and conveniently operated; and (4) the saturated packed column can be comprehensively utilized to reduce the cost of wastewater treatment.

Description

technical field [0001] The invention relates to the fields of waste straw application and heavy metal separation, in particular to a method for separating heavy metal lead and cadmium with a biosorbent packed column. Background technique [0002] Heavy metals are highly toxic, difficult to be metabolized in the environment, easy to be enriched by organisms, and have biomagnification effects. They not only pollute the water environment, but also seriously threaten the survival of humans and aquatic organisms. Metallurgical wastewater is one of the main sources of wastewater containing heavy metal ions. Once these untreated waste liquids containing heavy metals such as cadmium, lead, and copper are discharged, they will cause serious pollution to the environment and directly affect human production and life. There are many methods for the treatment of metallurgical wastewater containing heavy metal ions, mainly co-precipitation, flocculation, ion exchange, solvent extraction,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/24B01J20/30
Inventor 池汝安余军霞王丽艳张越非徐志高肖春桥
Owner 湖北威辰环境科技有限公司
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