A method of using microalgae to treat excess mercury in seawater

A seawater and microalgae technology, applied in seawater treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of low specificity, easy reproduction of microalgae, low processing cost, etc., and achieve strong adsorption. , the effect of easy reproduction and low processing cost

Active Publication Date: 2020-04-03
MARINE FISHERIES RES INST OF ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the low specificity of using algae to treat heavy metals in the prior art, the purpose of the present invention is to provide a method for microalgae to treat excess mercury in seawater. The selected microalgae have a higher selectivity for excess mercury in seawater. Adsorptive, and microalgae are easy to reproduce, low treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for using microalgae to treat mercury exceeding the standard in seawater is to put Chlorella sinensis into seawater containing mercury exceeding the standard to reduce the concentration of mercury in seawater, comprising the following steps:

[0033] (1) Cultivate algae species: Cultivate algae species in SE culture medium at 23°C. The light-dark cycle is 12 hours of light, 12 hours of shading, and the light intensity is 4000lux. 6 pieces / mL of suspended algae liquid; (2) Adsorption: Introduce seawater with a mercury concentration of 0.2 μg / L into the treatment pool, and then put in the suspended algae liquid for 4 days, and the dosage is 1L of suspended algae liquid / m 3 For seawater, continuously feed air into the seawater to ensure an oxygen concentration of 6.3mg / L.

[0034] During the cultivation process, the concentration of mercury gradually decreased, and after 4 days, the concentration of mercury decreased by 84.5%, reaching 0.031μg / L, which met the req...

Embodiment 2

[0036] A method for using microalgae to treat mercury exceeding the standard in seawater is to put Chlorella sinensis into seawater containing mercury exceeding the standard to reduce the concentration of mercury in seawater, comprising the following steps:

[0037](1) Cultivate algae species: Cultivate algae species in SE culture medium at 27°C. The light-dark cycle is 12 hours of light, 12 hours of shading, and the light intensity is 4000lux. 6 pieces / mL of suspended algae liquid;

[0038] (2) Adsorption: Introduce seawater with a mercury concentration of 0.5 μg / L into the treatment pool and put in the suspended algae liquid for 4 days, and the dosage is 1L of the suspended algae liquid / m 3 For seawater, continuously inject air into the seawater to ensure an oxygen concentration of 9.8mg / L.

[0039] During the cultivation process, the mercury concentration gradually decreased, and after 4 days, the mercury concentration decreased by 82.4%, reaching 0.088μg / L, which met the ...

Embodiment 3

[0041] A method for using microalgae to treat excess mercury in seawater, the algae balls made from Chlorella sinensis are put into seawater with a mercury concentration of 0.2 μg / L for cultivation to reduce the concentration of mercury in seawater, comprising the following steps:

[0042] (1) Cultivate algae species: Cultivate algae species in SE culture medium at 23°C, shake the culture medium twice a day, light intensity is 4000 lux, light-dark cycle is light 12h, shading 12h, after 2 days of cultivation, separate and concentrate to obtain a density of 10 6 pieces / mL of suspended algae liquid;

[0043] (2) Preparing algae balls: immobilizing the cultivated Chlorella sinensis to make algae balls coated with Chlorella sinensis;

[0044] (3) Adsorption: Introduce seawater to be treated into the treatment pool and put in algae balls, the amount of which is 1.8kg algae balls / m 3 For seawater, continuously feed air into the treatment tank to make the oxygen concentration 6.3mg / L...

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Abstract

The invention belongs to the technical field of water treatment, and in particular discloses a method for treating excessive mercury in seawater by using microalgae. According to the method, the concentration of mercury in the seawater is reduced by directly putting GY-H6 chlorella sp. into the seawater containing the excessive mercury or preparing the GY-H6 chlorella sp. into algae balls and then putting the algae balls into the seawater containing the excessive mercury; the algae balls are prepared by the following processes: dissolving polyvinyl alcohol and bisphenol A epoxy resin in water by heating, then adding a sodium alginate solution, and evenly mixing to prepare carrier liquid; then, dropwise adding feed liquid into crosslinked liquid containing Ca<2+>, solidifying and molding; soaking the molded algae balls in a disodium ethylenediamine tetraacetate solution for thinning out holes. The method for treating the excessive mercury in the seawater by using the microalgae utilizes the GY-H6 chlorella sp. to treat the mercury in the seawater, thus being high in removal efficiency, high in adsorption special for the mercury and environmentally friendly; furthermore, the algae balls prepared from the GY-H6 chlorella sp. is high in mechanical strength, good in resistance to swelling and high in mercury adsorption capacity, and can be recycled for a plurality of times.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for using microalgae to treat excess mercury in seawater. Background technique [0002] With the rapid economic development of coastal cities, a large amount of industrial and agricultural wastewater is discharged into the ocean, bringing a large amount of nitrogen, phosphorus, organic matter and heavy metal pollutants, leading to the gradual increase of heavy metal pollution in coastal waters. According to the "2016 Marine Environmental Quality Bulletin", among the pollutants discharged into the sea by rivers in my country in 2016, 14,000 tons of heavy metals were included, including 2,413 tons of copper, 575 tons of lead, 10,535 tons of zinc, 83 tons of cadmium, and 3 tons of mercury. cause great harm. At present, there are mainly physical remediation methods and chemical remediation methods to deal with heavy metal pollutants in seawater. Physical remediation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F101/20C02F103/08
CPCC02F3/322C02F2101/20C02F2103/08
Inventor 李铁军郭远明薛彬刘琴孙秀梅朱剑
Owner MARINE FISHERIES RES INST OF ZHEJIANG
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