Cadmium solidified bacterial organism adsorbents and preparation method thereof

A technology of biosorbents and bacteria, applied in biochemical equipment and methods, methods based on microorganisms, chemical instruments and methods, etc., can solve problems such as complex processes, secondary pollution, and high costs

Inactive Publication Date: 2007-09-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used treatment methods for wastewater containing heavy metal cadmium ions include chemical treatment, ion exchange, adsorption separation, and membrane separation. Such as complex process, high cost or secondary pollution, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Dried immobilized bacterial microspheres were put into industrial sewage with a cadmium ion concentration of 100mg / L, so that the final concentration of the microspheres reached 1g / L, adsorbed at 25°C for 2h, centrifuged at 6,000rpm for 8 minutes, and collected Supernatant, the concentration of cadmium ions in the supernatant was determined to be 26.7 mg / L by flame atomic absorption spectrometry. The adsorption amount of cadmium in the industrial sewage by the biosorbent is 73.3mg / g.

Embodiment 2

[0023] Example 2: Dried immobilized bacterial microspheres were put into domestic sewage with a cadmium ion concentration of 20mg / L, so that the final cell wall concentration reached 1g / L, adsorbed at 25°C for 2h, centrifuged at 6,000rpm for 8 minutes, and collected the supernatant liquid, and the concentration of cadmium ions in the supernatant was determined to be 3.37 mg / L by flame atomic absorption spectrometry. The adsorption amount of cadmium in the domestic sewage by the biosorbent is 16.63mg / g.

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PUM

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Abstract

The invention relates to a fixed bacteria biosorption of Cd and preparing method thereof, also relates to a biosorption made from a special bacteria processed by chemical agent embedding and preparing method thereof, the bacteria is bacillus cereus, the chemical agent is 2.5% of sodium alginate solution, suiting for processing waste water containing heavy metal Cd, which absorption efficiency of Cd is more than 50%.

Description

technical field [0001] The invention relates to a heavy metal cadmium immobilized bacterial biosorbent and a preparation method thereof. The bacteria is Bacillus cereus. The biosorbent is used to treat cadmium-containing wastewater. Background technique [0002] The heavy metal cadmium has strong biological toxicity, and its chemical properties are similar to zinc. In various biochemical processes, cadmium replaces enzyme-bound metals by binding and replacing enzyme sulfhydryl groups, reducing the body's antioxidant activity and causing oxidative damage; cadmium Cadmium can occupy calcium ion channels to enter cells and interfere with cellular calcium metabolism; cadmium can also cause DNA breaks, damage DNA repair systems, and cause cell apoptosis. Cadmium has a half-life of up to 3,000 years, making it the most toxic substance that accumulates in the human body. In 1974, the United Nations Environment Program designated it as a key pollutant. [0003] Heavy metal cadmi...

Claims

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Application Information

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IPC IPC(8): C12N11/04C12N1/20C12N1/38C02F1/62C02F3/34C12R1/085
Inventor 张洪勋呼庆齐鸿雁
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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