Method for removing heavy metal cadmium from water solution

An aqueous solution, heavy metal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc.

Active Publication Date: 2010-06-30
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no patented method for removing heavy metal cadmium in aqueous solution by using dry powder of Luxie yeast

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] After the preserved Saccharomyces ruckeri was activated on a YEPD solid slope at a constant temperature of 28°C, it was prepared into commonly used liquid seeds, and the liquid seeds were inoculated into the YEPD fermentation medium with an inoculum volume of 5%, a liquid volume of 50%, and a constant temperature of 30 ℃, rotating speed 180rpm, culture for 12h, centrifuge the fermented liquid at 4200rpm for 10min, collect the cells and wash with distilled water, after freeze-drying, grind and sieve to prepare the dry yeast powder of Luxie. Put the dry powder of Luxie yeast into the solution containing 10 mg / L cadmium according to the amount of the bacterial cell concentration after adding the dry yeast powder of Luxie, adjust the pH value of the liquid containing cadmium to 5.0, room temperature, shake occasionally, and absorb for 30 minutes; After standing still for 60 minutes, the Saccharomyces ruckeri with adsorbed cadmium was separated and removed.

Embodiment 2

[0015] After the preserved Saccharomyces ruckeri was activated on a wort solid slope at a constant temperature of 30°C, the wort liquid seeds were prepared, and the liquid seeds were inoculated into the YEPD fermentation medium with an inoculum size of 7%, a liquid content of 40%, and a constant temperature 28°C, rotating speed 160rpm, incubate for 22h, centrifuge the fermentation broth at 3000rpm for 20min, collect the cells and wash with distilled water, freeze-dry, grind and sieve, and prepare into Luxie yeast dry powder. According to the amount that the bacterial cell concentration reaches 4g / L after adding the Luxie yeast dry powder, put the Luxie yeast dry powder into the solution containing 50mg / L cadmium, adjust the pH value of the cadmium-containing liquid to 6.0, the temperature is 30°C, and the shaking frequency is 100rpm. Adsorb for 20 minutes; after standing still for 120 minutes, separate and remove the Luxie yeast adsorbed with cadmium.

Embodiment 3

[0017] After the preserved Saccharomyces ruckeri strains were activated on a wort solid slope at a constant temperature of 29°C, they were prepared into commonly used YEPD liquid seeds, and the liquid seeds were inoculated into the YEPD fermentation medium with an inoculation amount of 6% and a liquid filling amount of 20%. Constant temperature at 35°C, 150rpm, culture for 24h, centrifuge the fermentation broth at 3500rpm for 30min, collect the cells and wash with distilled water, freeze-dry, grind and sieve, and prepare into Luxie yeast dry powder; after adding Luxie yeast dry powder, the bacterial cell concentration reaches The amount of 4.5g / L, put the dry powder of Luxie yeast into the solution containing 100mg / L cadmium, adjust the pH value of the cadmium-containing liquid to 7.0, the temperature is 10°C, the oscillation frequency is 60rpm, absorb for 20min, and after standing still for 180min, separate and remove the adsorbed Cadmium of ruckeri.

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PUM

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Abstract

The invention provides a method capable of removing heavy metal cadmium from a water solution, which comprises the following steps: preparing zygosaccharomyces rouxii dry powder by zygosaccharomyces rouxii; then, putting the zygosaccharomyces rouxii dry powder into a cadmiferous solution; controlling the proper conditions; and removing the cadmium from the water solution through removing the zygosaccharomyces rouxii absorbed with cadmium ions. The invention has the advantages of simple process, high removal efficiency, low cost, high safety, no secondary pollution and the like. The invention has great significance on the removal of the cadmium ions from the water, and has wide application prospects in the fields of sewage treatment, drinking water purification, food production and biochemical industry.

Description

technical field [0001] The invention relates to a method for removing heavy metal cadmium in aqueous solution, belonging to the field of food biotechnology. Background technique [0002] Cadmium is a toxic element for human body. Environmental pollution leads to water pollution, resulting in excessive cadmium content in some food raw materials, especially aquatic products, threatening human health. The current cadmium removal methods mainly include precipitation and so on. Microorganisms have become an important research and application direction for the removal of heavy metals because of their advantages such as easy cultivation and fast reproduction. [0003] Saccharomyces rouxii is easy to cultivate and is the main starter in the fermentation production of soy sauce and sauce. The invention utilizes the good adsorption of rucker yeast to cadmium and its own precipitation effect to remove cadmium ions from the cadmium-containing aqueous solution. Luxie yeast cells are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F3/34C02F101/20
Inventor 徐莹汪东风刘婍李春生
Owner OCEAN UNIV OF CHINA
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