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

Inactive Publication Date: 2010-01-27
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems of low inactivation rate and impact on the safety of drinking water existing in the existing method for killing chironomus larvae, thereby providing a safe water treatment method that can completely remove chironomus larvae
The present invention solves the problems of increasing disinfection by-products and inability to completely remove chironomus larvae existing in the removal of chironomus larvae in water by prechlorination process in the past. The present invention adopts the water treatment technology of pre-passing ozone and hydrogen peroxide, utilize The strong oxidative properties of ozone and hydrogen peroxide inactivate chironomus larvae, making them completely and effectively removed in the subsequent coagulation, sedimentation and filtration processes

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  • Water treatment method for killing tendipes by utilizing ozone/hydrogen peroxide
  • Water treatment method for killing tendipes by utilizing ozone/hydrogen peroxide

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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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Abstract

The invention provides a water treatment method for killing tendipes by utilizing ozone / hydrogen peroxide, relating to a water treatment method. The current water treatment method for killing tendipes by adopting prechlorination technology has maladies of not only affecting the safety of drinking water, but also being incapable of killing tendipes completely and effectively. The method in the invention is as follows: introducing ozone and hydrogen peroxide beforehand into the raw water before conventional processing, wherein, the introduction amount of ozone in each liter of raw water is 1.6-2.2 mg, the dosage of hydrogen peroxide is 5-10 mg, and the retention time of the ozone and hydrogen peroxide in raw water is 15-25 min. The invention can effectively control the tendipes in water to ensure the conformity of effluent water quality index; in addition, the technology has the characteristics of safe and convenient operation and high feasibility.

Description

Technical field: [0001] The invention relates to a water treatment method, in particular to a method for killing chironomid larvae in water so that they can be effectively removed. Background technique: [0002] The eutrophication of the water body provides a living space for the mass reproduction of chironomid larvae, and human over-fishing has become the driving force for the rapid growth of chironomid larvae. Chironomid larvae have been found in the clean water ponds of some large and medium-sized cities in my country and even in the water of the pipe network, and there have even been many accidents of the larvae of the pipe network. Practice has shown that the freshly hatched chironomid larvae have strong vitality, swimming, and easy to penetrate the filter. Its appearance in the water of users not only violates the requirements for sensory traits in the drinking water sanitation standards, but also brings bad sensory effects to users. More importantly, most of the chironomi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F1/50
Inventor 孙兴滨崔福义
Owner NORTHEAST FORESTRY UNIVERSITY
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