Water treatment method for killing tendipes by utilizing ozone/hydrogen peroxide
A technology for hydrogen peroxide and chironomids larvae is applied in the field of killing chironomids larvae in water so that they can be effectively removed, and can solve the problems of drinking water safety impact, low inactivation rate, inability to completely remove chironomid larvae and the like
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specific Embodiment approach 1
[0005] Specific embodiment 1: The water treatment method of this embodiment using ozone / hydrogen peroxide to kill chironomid larvae is: adding ozone and hydrogen peroxide to the raw water before the conventional treatment, and the ozone input per liter of raw water is 1.6 ~2.2mg, the dosage of hydrogen peroxide is 4-10mg, and the residence time of ozone and hydrogen peroxide in the raw water is 15-25 minutes.
specific Embodiment approach 2
[0006] Embodiment 2: This embodiment is a test to verify the feasibility of the present invention, in which ozone and hydrogen peroxide are continuously or intermittently introduced into the raw water before the conventional treatment. Among them, raw water COD Mn 4.1mg / L, turbidity is 8.6NTU. Ozone is produced by an ozone generator and transported to the bottom of the reactor through a closed pipeline, and the air is distributed by the microporous filter plate at the bottom to form tiny bubbles and fully mixed with the raw water. Hydrogen peroxide is diluted to 0.1-0.2% with chemical agents, and is directly dosed through a peristaltic pump. The amount of ozone introduced per liter of raw water was 1.6mg, the amount of hydrogen peroxide added was 5mg, and the contact time was 20 minutes. After 20 minutes, it was observed that all the chironomid larvae in the raw water died, and the ozone / hydrogen peroxide killing rate Reach 100%.
specific Embodiment approach 3
[0007] Specific embodiment three: This embodiment is a comparative test conducted by using the method of the present invention and using chlorine to kill hair. The test site was a water plant in Shenzhen. The production test was conducted on the raw water from the water plant. The raw water quality conditions were: water temperature 28°C; turbidity 6.8NTU; COD Mn 4.8mg / L; pH value 6.98; the number of chironomid larvae is 12 / L. The inactivation effect of chironomid larvae in raw water using conventional pre-chlorination process is attached. figure 1 . Such as figure 1 As shown, within the test concentration range of chlorine gas (=10mg / L), the inactivation effect of chironomid larvae is not ideal. When the chlorine dosage is 10mg / L, the killing rate is only 33% (attached figure 1 ). The method of the present invention is used to kill the chironomid larvae. When the dosage of ozone is 1.6mg / L and the amount of hydrogen peroxide is 5mg, the raw water is tested after 20 minutes, ...
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