A way to control the risk of algal toxins without destroying algal cells

Abstract

The invention discloses a method for controlling an algal toxin risk without damaging algae cells. The method comprises the following steps: carrying out UV-C radiation and S2O8<2-> feeding combined treatment on water which simultaneously contains algae cells and extracellular algal toxin, wherein the dosage of UV-C is 50mJ.cm<-2>-100mJ.cm<-2>, the concentration of S2O8<2-> is 2mM-10mM, S2O8<2-> generates free radical SO4<->. with strong oxidizing property by virtue of stimulation of UV-C, and SO4<->. can remove the extracellular algal toxin by oxidization. The method has the advantages that the extracellular algal toxin can be efficiently removed without damaging the algae cells, the damaging of the algae cells is not aggravated, a large number of algal toxin is prevented from being released from the algae cells, and the safety risk is reduced; the health and the environmental friendliness are achieved, no disinfection by-product is produced during the treatment, and new damage is avoided; the preparation is simple, the application is flexible, and the method is simple and can be widely used for treating water which simultaneously contains the algae cells and the extracellular algal toxin.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for controlling the risk of algal toxins without destroying algae cells. Background technique [0002] With the eutrophication of water bodies, algae grow in large quantities, and even explosive growth occurs under suitable conditions to produce algae blooms, which brings a series of environmental problems and drinking water safety problems. Some algal cells that can produce toxins multiply in large numbers, and their secondary metabolites, algal toxins, pose a serious threat to human health. There are many types of algal toxins, mainly including cyclic peptide hepatotoxins, alkaloid neurotoxins, and lipopolysaccharide toxins. Short-term or long-term exposure to water containing algal toxins or drinking water containing algal toxins may cause diarrhea, Vomiting, headache, fever, muscle and joint pain and other symptoms can even lead to death. In 1996, algae tox...

AI Technical Summary

Problems solved by technology

[0006] Chemical methods such as O 3 Oxidation, Cl 2 Oxidation, ClO 2 Oxidation, KMnO 4 Oxidation, etc. Although it can effectively oxidize and remove algal toxins, it will cause algal cell rupture and release a large amount of algal toxins that mainly exist in the cells. It requires a large amount of oxidant to increase the cost of treatment.

When the dosage of oxidants is large, a large number of disinfection by-products will be produced, which will bring new safety threats, especially halogen-containing oxidants, such as adding a large amount of Cl 2 Will produce HAAs, etc., add a lot of ClO 2 Will produce chlorite, chlorate, etc.

while adding a large amount of O 3 Bromate, formaldehyde, etc. will be produced, and a large amount of KMnO will be added 4 It will cause new safety problems such as excessive manganese and chroma

[0007] Advanced oxidation such as UV-C and H 2 o 2 Combination, UV-C and ClO - Combined use, etc., using UV-C to stimulate the production of strong oxidative free radicals, oxidatively decompose algal toxins, although the treatment efficiency and speed have been improved, but it has similar problems to chemical methods, which also cause algal cell rupture and release a large amount of algal toxins. Halogen-containing oxidants will also produce a large number of disinfection by-products, etc., bringing new safety issues

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