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Method for treating mercury-containing wastewater by using modified blue-green algae

A cyanobacteria, modified technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of no patented technology and literature reports, no modification of cyanobacteria to treat mercury-containing wastewater, etc. , to achieve the effect of reducing eutrophication, convenient recycling of blue-green algae, and reducing the difficulty of governance

Inactive Publication Date: 2014-08-06
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, relevant Chinese and English literatures have reported the biosorption of other heavy metals by cyanobacteria, such as the use of modified cyanobacteria to adsorb and remove antimony-containing solutions. Patented technology and literature reports

Method used

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  • Method for treating mercury-containing wastewater by using modified blue-green algae
  • Method for treating mercury-containing wastewater by using modified blue-green algae
  • Method for treating mercury-containing wastewater by using modified blue-green algae

Examples

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Effect test

Embodiment 1

[0034] Effects of different pH values ​​on the adsorption capacity of modified cyanobacteria

[0035] Such as figure 1 As shown, in the method for treating mercury-containing wastewater with modified cyanobacteria in the present invention, under the conditions that the pH of the water body is 3.83, 4.76, 5.64, 6.58 and 7.36 respectively, 1g of modified cyanobacteria adsorbent is added to 500mL with an initial concentration of 0.7 mg / L of mercury-containing wastewater, placed on a shaker and shaken for 1h. From figure 1 It can be seen from the figure that the adsorption rate of mercury by the modified cyanobacteria adsorbent is basically not affected by the change of water pH, and the modified cyanobacteria have a large adsorption capacity for mercury in the range of water pH = 3.83-7.36. Example 2

Embodiment 2

[0036] Effects of different dosages of modified cyanobacteria on adsorption performance

[0037] Such as figure 2 As shown, in the method for treating mercury-containing wastewater with modified cyanobacteria in the present invention, 0.5g, 1g and 2g of modified cyanobacteria adsorbents are added to 500mL of mercury-containing wastewater with an initial concentration of 0.5mg / L and a pH of 5.64 respectively , placed on a shaker and oscillated for 1.5h. figure 2"○" in the curve indicates that the dosage of modified cyanobacteria adsorbent is 0.5g, which accounts for 0.1% of the mass percentage of mercury-containing wastewater; "▽" indicates that the dosage of modified cyanobacteria adsorbent is 1g, which accounts for The mass percentage of mercury-containing waste water is 0.2%; "□" indicates that the dosage of modified cyanobacteria adsorbent is 2g, that is, the mass percentage of mercury-containing waste water is 0.4%. It can be seen that when the dosage of modified cyano...

Embodiment 3

[0039] image 3 It is a schematic diagram of the adsorption isotherm of modified blue-green algae to mercury in the method of the present invention. In the method for treating mercury-containing wastewater with modified blue-green algae in the present invention, 1g of modified blue-green algae adsorbent is added to 500mL mercury concentration of 0.05mg / L, 0.1mg / L, 0.3mg / L, 0.5mg / L, 0.7mg / L and 1.0mg / L, in mercury-containing wastewater with a pH of 5.64, shake on a shaker for 1h. Such as image 3 As shown, the adsorption amount increases with the increase of the adsorption equilibrium concentration, and this increasing trend becomes more obvious with the increase of the equilibrium concentration, indicating that the adsorption behavior of modified cyanobacteria to mercury conforms to the Freundlich model.

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Abstract

The invention discloses a method for treating mercury-containing wastewater by using modified blue-green algae. The method is characterized by comprising the following steps: (1) performing acidification modification treatment on blue-green algae, thus obtaining modified blue-green algae; (2) treating the wastewater by employing the modified blue-green algae; (3) detecting the supernatant fluid of the wastewater, and discharging the wastewater after qualification; and (4) recovering the blue-green algae, namely filtering the used modified blue-green algae, desorbing the blue-green algae in a desorbing agent for 1 hour, and filtering and refrigerating the modified blue-green algae. The modified blue-green algae raw materials used in the method come from eutrophic lakes and are easily obtained, mass propagation or dead algae in the lakes are reasonably utilized, the eutrophication phenomena can be reduced, and the treatment difficulty of the lake eutrophication is lightened; and moreover, the method for adsorbing and removing the mercury-containing industrial wastewater by utilizing the modified blue-green algae is simple in process and convenient to use.

Description

technical field [0001] The invention relates to a method for treating wastewater by using a biological adsorption method, in particular to a method for treating mercury-containing wastewater by using modified blue-green algae. Background technique [0002] Mercury is a highly toxic metal element that is harmful to the environment and has a bioaccumulation effect. It has been listed as a priority pollutant by many international organizations. Mercury-containing wastewater is one of the most serious environmental pollution industrial wastewater. A large amount of mercury-containing wastewater is produced in mercury smelting, lead-zinc smelting, electrochemistry and other industries. Among them, the waste water discharged from the production of amalgamation smelting, recycled mercury smelting, chlor-alkali industry, plastics industry, and electronics industry is the main source of mercury pollution in water bodies. At present, the consumption of mercury in my country is increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 廖海清吴丰昌孙福红李强
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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