Method for degradation of microcystin in water by means of electron beam irradiation

A technology of electron beam irradiation and electron beam radiation, which is applied in the field of sewage treatment, can solve problems such as incompleteness, low efficiency, and secondary pollution, and achieve the effects of good treatment effect, low preparation cost, and great application potential

Inactive Publication Date: 2013-01-09
SHANGHAI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the slowness, incompleteness and low efficiency of the traditional water treatment technology and process in the process of toxin removal, and the disadvantages of secondary pollution and "three causes" effect at the same time. Application of Nuclear Techniques to the Degradation and Removal of Algae Toxins

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  • Method for degradation of microcystin in water by means of electron beam irradiation
  • Method for degradation of microcystin in water by means of electron beam irradiation
  • Method for degradation of microcystin in water by means of electron beam irradiation

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Embodiment

[0016] The method of the present invention is achieved through the following steps (taking the toxin secreted by Microcystis aeruginosa as an example):

[0017] (1) Carry out different doses of irradiation, the radiation energy is kept at 1.8MeV, the beam current is set at 1.0mA, and the primary radiation dose is 1kGy; the radiation doses used in the experiment are 1kGy, 2kGy, 3kGy, 4kGy, 5kGy respectively.

[0018] (2) Take 40ml of algae liquid every day to extract extracellular and intracellular toxins respectively. The algae solution is heated at 12000r·min -1 , centrifuged at 4°C for 10 min, and the precipitated part was set aside; the supernatant was filtered with a 0.22 μm filter membrane, and the filtrate was used for the determination of extracellular toxins. The collected algae cells were washed three times with ultrapure water to remove the toxins on the surface of the algae cells. Add a small amount of ultrapure water to the washed precipitate, freeze and thaw rep...

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Abstract

The invention relates to a method for degradation of microcystin in water by means of electron beam irradiation and belongs to the technical field of sewage treatment. The method is a novel technique for microcystin removal in a source water or drinking water treatment procedure. Experimental processes confirm microcystin degradation effect of electron beam irradiation. 2-5kGy irradiation has evident inhibition and removing effects on generation of intracellular toxin, the extracellular toxin removal rates of the 2-5kGy irradiation are 76.9%, 76.2%, 76.2% and 97.7% respectively, and free radicals formed in solution during irradiation are absorbed by algae liquid so that toxins are effectively degraded. Special structures in the toxins are changed or removed by electron beam irradiation, and efficient degradation is achieved. The removal effect is increasingly evident along with increase of dose, and microcystin in algae containing water environments can be effectively removed and restrained from growing when irradiation dose is 5kGy.

Description

technical field [0001] The invention relates to a method for degrading algal toxins in water by electron beam irradiation, belonging to the technical field of sewage treatment. Background technique [0002] Cyanobacteria blooms and their toxins, as the focus of water eutrophication pollution, secrete microcystins that are harmful to humans, (Microcystin). Conventional water treatment processes such as coagulation, sedimentation, filtration, and chlorination in tap water treatment processes cannot effectively remove algal toxins in water. Physical methods such as air flotation, membrane filtration, and activated carbon adsorption can only transfer MCs from one medium to another. A medium, general chemical oxidation methods such as chlorination and potassium permanganate oxidation have the risk of forming three disinfection by-products. Although the biological method does not produce secondary pollution and has low cost for degrading microcystins, it is only effective in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/72
Inventor 刘书宇王岩敖细勇吴明红
Owner SHANGHAI UNIV
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