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Heavy metal biological absorbent, preparation method thereof and application in treating cadmium-containing wastewater

A technology for biological adsorbents and heavy metals, which is applied in the fields of adsorbing water/sewage treatment, alkali metal compounds, alkali metal oxides/hydroxides, etc. The effect of adsorption function, improvement of water environment, and low cost of treatment process

Inactive Publication Date: 2011-08-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing wastewater treatment technologies generally require harsh reaction conditions, are costly, and are not easy to operate

Method used

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  • Heavy metal biological absorbent, preparation method thereof and application in treating cadmium-containing wastewater
  • Heavy metal biological absorbent, preparation method thereof and application in treating cadmium-containing wastewater
  • Heavy metal biological absorbent, preparation method thereof and application in treating cadmium-containing wastewater

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Effect test

Embodiment 1

[0026] Example 1: The heavy metal biosorbent of the present invention and its preparation and application at different pH values.

[0027] A heavy metal biosorbent mainly consists of Penicillium simile powder modified by rhamnolipid.

[0028] The heavy metal biosorbent of this embodiment is specifically prepared by the following steps:

[0029] (1) Scrape the spore powder of Penicillium simplicissimum from the slant culture medium, make a spore suspension in sterile water, and inoculate the spore suspension into a sterilized liquid medium (see In table 1), liquid culture medium 100mL is housed in the 500mL Erlenmeyer flask;

[0030] (2) Penicillium simpleum after step (1) is cultivated continues to be expanded and cultivated, and biosurfactant rhamnolipids (rhamnolipids) is added in the nutrient solution for expanded cultivation, and the amount of rhamnolipids in every liter of nutrient solution The addition amount is 0.20g, and then placed in a constant temperature shaking ...

Embodiment 2

[0044] Example 2: Application of the heavy metal biosorbent of the present invention at different adsorption times.

[0045] Utilize the heavy metal biosorbent that embodiment 1 makes to remove the cadmium in the waste water, specifically comprise the following steps:

[0046] (1) The above-mentioned heavy metal biosorbent is divided into seven groups and added to the waste water with an initial concentration of cadmium of 20 mg / L, and the amount of addition per liter of waste water is 0.2 g;

[0047] (2) Perform oscillation reaction on the above waste water respectively, and control the reaction conditions respectively: the pH value is 5.0, the temperature is 28°C, the rotation speed is 120rpm, and the reaction time is 0.5h, 1h, 2h, 3h, 4h, 5h, 6h;

[0048] (3) Filter out the heavy metal biosorbent after the above oscillation reaction, and complete the removal of cadmium in the wastewater.

[0049] Determination of cadmium residues in water after the treatment of each group ...

Embodiment 3

[0052] Utilize the heavy metal biosorbent that embodiment 1 makes to remove the cadmium in the waste water, specifically comprise the following steps:

[0053] (1) Add the above-mentioned heavy metal biosorbents in six groups to the wastewater to be treated with an initial concentration of cadmium of 20mg / L, 60mg / L, 100mg / L, 200mg / L, 300mg / L and 400mg / L, The amount of wastewater added is 0.2g;

[0054] (2) Perform oscillation reaction on the above-mentioned groups of wastewater respectively, and control the reaction conditions: the pH value is 5.0, the temperature is 28°C, the rotation speed is 120rpm, and the reaction time is 4h;

[0055] (3) Filter out the heavy metal biosorbent after the above oscillation reaction, and complete the removal of cadmium in the wastewater.

[0056] Utilize the contrast sample among the embodiment 1 equally, and apply according to the step of above-mentioned embodiment 3, measure the residual amount of cadmium in the water after the waste water...

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Abstract

The invention discloses a heavy metal biological absorbent, a preparation method of the absorbent and an application in treating cadmium-containing wastewater. The heavy metal biological absorbent mainly consists of penicillium simplicissimum bacteria powder after being modified by rhamnolipid. The method for preparing the biological absorbent comprises the following main steps: culturing penicillium simplicissimum in a liquid culture medium, then continuously enlarging and culturing the cultured penicillium simplicissimum, adding the rhamnolipid taken as biosurfactants during the process, collecting fungus balls after the culture, cleaning the fungus balls with inorganic salt solution, freezing and drying the fungus balls to the constant weight and grinding the fungus balls into powder to obtain the heavy metal biological absorbent. In the application in treating the cadmium-containing wastewater, the heavy metal biological absorbent is mainly utilized to remove the cadmium in the wastewater, and the method mainly comprises the following steps: adding the heavy metal biological absorbent into the cadmium-containing wastewater, carrying out oscillatory reaction and completely removing after the filtration. The heavy metal biological absorbent has good absorption effect when being used for treating the cadmium-containing wastewater. The method for removing the cadmium contained in the wastewater has the advantages of simple operation conditions, low cost and high efficiency and is easy to implement.

Description

technical field [0001] The invention relates to the field of microorganism application and waste water treatment, in particular to a heavy metal biosorbent, its preparation method and its application in treating cadmium-containing waste water. Background technique [0002] At present, the harm of heavy metal pollution in the environment has become a global problem. Among them, the heavy metal cadmium has the characteristics of high toxicity and wide distribution, and has serious harm to the growth and development of humans, animals and plants. Cadmium-containing wastewater mainly comes from electroplating factories, dye industries, mining and metallurgy processes, battery production, tanning, film manufacturing, and automobile manufacturing. Therefore, how to remove cadmium pollution has been highly concerned by environmental protection researchers. The traditional methods for treating cadmium-containing wastewater mainly include ion exchange method, chemical precipitation...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01J20/28C02F1/28C02F1/62
Inventor 袁兴中姜丽丽曾光明刘智峰陈耀宁
Owner HUNAN UNIV
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