Method for removing micro-pollutants in water via combination of ultraviolet light and free chlorine
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A technology for pollutants and water removal, applied in the field of micro-pollutant control, can solve the problems of negative impact on human survival and health, threats to aquatic organisms' living environment, high hazard stability, etc., and achieves easy popularization and application, low cost, guarantee The effect of water safety
Inactive Publication Date: 2014-01-22
SUN YAT SEN UNIV
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These toxic and harmful pollutants pose a huge threat to the living environment of aquatic organisms in natural water bodies. At the same time, for human beings, various organic substances cannot be treated by traditional methods because of their low concentration, high hazard and high stability. Conventional processes effectively remove, and in the disinfection process in water plants, such as chlorination disinfection, a large number of toxic and harmful disinfection by-products are produced, which has a huge negative impact on human survival and health
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specific Embodiment approach 1
[0026] This embodiment is based on the combination of ultraviolet light and free chlorine to remove micro-pollutants in water according to the following method: add chlorine to water containing micro-pollutants, and fully stir, and then perform light irradiation to complete the removal of micro-pollutants in water . Among them, chlorine is hypochlorous acid (sodium, potassium, calcium, magnesium) or chlorine gas. The dosage of chlorine depends on the water quality conditions and the concentration of pollutants in the water. The molar ratio of chlorine to micro-pollutants in water is 1:1~100 : 1 add.
[0027] In this embodiment, light irradiation can use sunlight, low-pressure mercury lamp, medium-pressure mercury lamp, high-pressure mercury lamp, amalgam ultraviolet lamp, and halogen lamp to meet the conditions of use, and can also use xenon lamp, black lamp, vacuum ultraviolet lamp, One of X-rays, alpha rays, or gamma rays.
[0028] In this embodiment, the chlorine dosing m...
specific Embodiment approach 2
[0030] The difference between this embodiment and the specific embodiment 1 is that the chlorine dosing method adopts the solution method, the light irradiation adopts the immersion method, and the outer wall of the ultraviolet light source needs to be protected by a nested quartz tube.
specific Embodiment approach 3
[0032] The difference between this embodiment and specific embodiment 1 is that chlorine is directly added in the form of chlorine gas, and the light irradiation adopts surface irradiation, and the ultraviolet light source does not need to be protected by nesting quartz tubes.
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Abstract
The invention discloses a method for removing micro-pollutants in water via combination of ultraviolet light and free chlorine. The pollutants removed by the method are various pernicious micro-pollutants in water, such as pharmaceuticals and personal care products (PPCPs), algal toxin and refractory organics. The method specifically comprises the following steps: adding free chlorine into water containing the micro-pollutants, then performing light irradiation, generating a large amount of hydroxyl radicals and helium atom to attack the micro-pollutants and degrade the micro-pollutants, wherein the feeding amount of the chlorine is determined by the water quality condition and the concentration of the pollutants; the chlorine is fed according to a mole ratio of the chlorine to the pollutants in water being 1:1-100:1; the free chlorine is pypocholoride or chlorine. The method, disclosed by the invention, is simple to operate, obvious in effect and safe to use; the fed chlorine also can be used for the subsequent disinfection; after being processed via the method, the micro-pollutants in water can be completely removed; meanwhile, through the method, other pollutants can be removed synchronously; the synergy of the combination of ultraviolet light and free chlorine for disinfection can be played.
Description
[0001] technical field [0002] The present invention relates to the technical field of control of toxic and harmful micro-pollutants in water, more specifically, to a method for removing micro-pollutants in water by combining ultraviolet light and free chlorine, which is suitable for drinking water treatment, advanced sewage treatment, regenerated water treatment, Groundwater treatment, etc. [0003] Background technique [0004] In recent years, with the rapid development of industry and agriculture and the continuous improvement of people's living standards, more than 90% of drinking water sources in my country have been seriously polluted. A large number of toxic and harmful organic pollutants, such as: pharmaceuticals and personal care products (PPCPs), persistent organic pollutants (POPs), pesticides, petroleum organic pollutants, chemical products and other types of man-made chemicals are discharged into natural water bodies; At the same time, algal or bacterial ...
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