CN1626449A

CN1626449A - Sterilization method and device for drinking water

Info

Publication number: CN1626449A
Application number: CN 200310111126
Authority: CN
Inventors: 江河
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-08
Filing date: 2003-12-08
Publication date: 2005-06-15

Abstract

A method for sterilizing the drinking water features that the non-toxic photocatalyst is contacted with the drinking water for killing bacteria under the action of light. Its apparatus is composed of a bactericiding pool, a transparent pipe in said pool, the non-toxic photocatalyst attached on the external surface of said transparent pipe, the light source in said transparent pipe, and a stirrer.

Description

Drinking water sterilization method and device

Technical Field

The invention relates to a water treatment method, in particular to a chlorine-free drinking water sterilization method and a device.

Background

The process for producing tap water (drinking water) generally comprises the steps of filtration, precipitation, sterilization and the like. In the sterilization step, liquid chlorine sterilization is a commonly used method at home and abroad. Namely, liquid chlorine is pumped into the sterilization pool to kill bacteria in the water. The method is not only high in cost, but also can generate secondary pollution. In particular, the chlorine reacts with trace methane in water to produce chloroform, which is carcinogenic and cannot be removed by filtration or adsorption.

With the development of science and technology, the production of nontoxic nanometer photocatalyst has become a mature prior art, and the application field is more and more extensive. The nanometer photocatalyst reacts with O under the action of light₂、H₂O function to generate superoxide negative oxygen ions and hydroxyl radicals, can kill various bacteria efficiently, and can kill various bacteriaThe organic matter is decomposed into water, carbon dioxide and other non-toxic substances. In particular to non-toxic nano photocatalyst TiO₂The prepared product is widely used in the fields of air cleaning and the like. However, the nano photocatalyst is used for disinfection and sterilization in the tap water industry, and has not been reported yet.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method and a device for sterilizing drinking water by using a non-toxic nano photocatalyst aiming at the defects of the prior art.

The invention solves the technical problem, adopts the technical scheme that the drinking water sterilization method comprises a sterilization step; in the sterilization step, a non-toxic nano photocatalyst is adopted to contact with water, and sterilization is carried out under the action of a light source.

A drinking water sterilizing device comprises a sterilizing pool; a transparent tube is arranged in the sterilization tank; the outer surface of the transparent tube is attached with a non-toxic nano photocatalyst; a light source is arranged in thetransparent tube.

The invention has the advantages of low cost, no toxicity, no pollution and good sterilization effect.

Drawings

FIG. 1 is a schematic view of a drinking water sterilizing apparatus

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

The drinking water sterilization method comprises a sterilization step, wherein in the sterilization step, a non-toxic nano photocatalyst is adopted to contact with water and is sterilized under the action of a light source; the optimized scheme is that in the sterilization step, the adopted nontoxic nano photocatalyst is TiO₂(ii) a The adopted light source is an ultraviolet lamp; further, in the sterilization step, the non-toxic nano photocatalyst adopted comprises TiO₂And a modified substance; the light source is a common light source;the modifier is ZnO or SiO₂、SnO₂Or mixtures thereof.

A drinking water sterilizing device, which comprises a sterilizing pool 1; a transparent tube 2 is arranged in the sterilization tank 1; the outer surface of the transparent tube 2 is attached with a non-toxic nano photocatalyst; a light source 4 is arranged in the transparent tube 2; the outer surface of the transparent tube 2 is uneven or roughened; preferably, a stirring device 3 is also arranged in the sterilizing tank 1; in a further scheme, the nontoxic nano photocatalyst is TiO₂(ii) a The light source 4 is an ultraviolet lamp; more practically, the non-toxic nano-photocatalyst comprises TiO₂And a modified substance; the light source 4 is a common light source; the modified substances are ZnO and SiO₂、SnO₂Or mixtures thereof.

The drinking water sterilizing method of the present invention utilizes photocatalyst to react with O in water under the action of light₂、OH^-Acting to generate superoxide negative oxygen ion (O)₂ ^-) And hydroxyl radical (OH)^·). With the usual photocatalyst TiO₂For example, the main reaction formula is as follows:

；

e-electron h⁺-cavities

Negative oxygen ion (O) in the above formula₂ ^-) And hydroxyl radical (OH)^·) They are strongly oxidizing and they decompose organic compounds in water into water and non-toxic substances such as carbon dioxide. The strong oxidation of the photocatalyst destroys the cell membrane of the microorganism, thereby achieving the effect of sterilization. Due to TiO₂The photocatalyst requires ultraviolet activation, and its application is limited. With TiO₂Adding appropriate modifier such as ZnO and SiO as main ingredient₂、SnO₂Or mixtures thereof, photocatalysts thus composed, usefulIn the field of ordinary light.

Examples

A device for implementing the drinking water sterilization method of the present invention is shown in fig. 1. In the device, the device is provided with a plurality of air outlets,the sterilizing tank 1 is provided with a transparent tube 2, and the transparent tube 2 can be made of high-temperature-resistant transparent materials such as glass, quartz and the like. The outer surface of the transparent tube 2 is coated with TiO₂High-temp sintering of photocatalyst to obtain TiO₂The photocatalyst is firmly attached to the outer surface of the transparent tube 2. The outer surface of the transparent tube 2 is made into unevenness or is roughened, so that more photocatalyst can be loaded, and the sterilization efficiency is improved. One end of the transparent tube 2 is closed, the closed end is inserted into water, and an ultraviolet lamp light source 4 is arranged in the tube. The sterilizing tank 1 is provided with a stirring device 3. The device has the function of providing power for the flow of water, so that the water is fully contacted with the photocatalyst, and the sterilization efficiency is further improved. The transparent tube 2 may also be made of plastic. The number of the transparent tubes 2 in the sterilization pool 1 is determined according to the size of the sterilization pool 1 and the water quality, and the length of the transparent tubes 2 is determined according to the depth of the water in the sterilization pool 1.

The following is experimental data for the tap water plant in Dazhou city, Sichuan:

TiO sterilized by liquid chlorine before water sterilization₂After the photocatalyst is sterilized

Iron 0.070.07 is less than 0.01

Fierce 0.050.05-

Copper 0.020.02 is less than 0.015

Zinc 0.080.08 is less than 0.01

Chroma<5-

Phenols<0.002-

Cation synthesis

Detergent 0.040.04 less than 0.02

Total bacteria (not detected) 10 CFU/ml-

"- - - - -" means undetectable.

As can be seen from the above experimental data, the use of TiO as the carrier₂The photocatalyst as main component is used in sterilizing drinking water, and can kill various kinds of bacteria, decompose trace amount of organic matter in water into water, carbon dioxide and other non-toxic matter and adsorb heavy metal ion in water. The sterilizing effect is better than that of liquid chlorine. Has the advantages of low cost, no toxicity and no pollution.

Claims

1. A drinking water sterilization method comprises a sterilization step and is characterized in that in the sterilization step, a non-toxic nano photocatalyst is adopted to contact with water and sterilize under the action of a light source.

2. The drinking water sterilization method according to claim 1, wherein the nontoxic nano photocatalyst adopted in the sterilization step is TiO₂(ii) a The light source is an ultraviolet lamp.

3. The drinking water sterilization method according to claim 1, wherein the nontoxic nano-photocatalyst used in the sterilization step comprises TiO₂And a modified substance; the light source is a common light source.

4. The drinking water sterilization method according to claim 3, wherein the modifier is ZnO or SiO₂、SnO₂Or mixtures thereof.

5. A drinking water sterilizing device comprises a sterilizing pool (1), and is characterized in that a transparent pipe (2) is arranged in the sterilizing pool (1); the outer surface of the transparent tube is attached with a non-toxic nano photocatalyst; and a light source (4) is arranged in the transparent tube.

6. The drinking water sterilization device according to claim 5, wherein the outer surface of the transparent tube (2) is rugged or roughened.

7. Drinking water sterilisation apparatus according to claim 5 or 6, characterised in that in the sterilisation tank (1) there is also provided stirring means (3).

8. The drinking water sterilizing device according to claim 5, 6 or 7, wherein the non-toxic nano photocatalyst is TiO₂(ii) a The light source (4) is an ultraviolet lamp.

9. The drinking water sterilization device of claims 5, 6, or 7, wherein the non-toxic nano-photocatalyst comprises TiO₂And a modified substance; the light source (4) is a common light source.

10. The drinking water sterilization device according to claim 9, wherein the modifier is ZnO or SiO₂、SnO₂Or mixtures thereof.