Disinfection method of recycled water

A disinfection method and reclaimed water technology, applied in the direction of light water/sewage treatment, sterilization/microdynamic water/sewage treatment, etc., can solve the problem that ultraviolet disinfection technology cannot provide continuous disinfection ability, chlorine dioxide is easy to explode, and disinfection costs increase, etc. problems, to achieve the effect of inhibiting photoreactivation, improving bactericidal ability, and enhancing disinfection ability

Inactive Publication Date: 2014-11-12
徐州市城区水资源管理处(徐州市城市节约用水办公室)
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Problems solved by technology

[0006] 1. The liquid chlorine disinfection method has good disinfection effect and continuous disinfection ability. So far, in the urban water supply and drainage treatment system, liquid chlorine disinfection is still the most economical and widely used disinfection method, but liquid chlorine disinfection cannot kill hidden Microorganisms such as sporozoites and giardia, and their disinfection by-products such as chloroform compounds have carcinogenic effects;
[0007] 2. Ultraviolet rays can kill microorganisms in water in a short period of time. After disinfection, no disinfection by-products are produced, no secondary pollution, and the equipment is easy to install and operate. However, ultraviolet disinfection technology cannot provide continuous disinfection capabilities, that is, when the water body leaves After the unit is disinfected, some microorganisms in the water body will be revived, which will affect the safety of water use;
[0008] 3. Ozone disinfection is efficient, fast, does not produce secondary pollution and disinfection by-products, and the sterilization speed of ozone is 600 times faster than chlorine, but the dosage is 1 / 40000 of chlorine, but in the process of water treatment and disinfection, ozone Production energy consumption is high, equipment investment is large, and operating cost is high;
[0009] 4. Chlorine dioxide disinfection has the characteristics of broad-spectrum, high efficiency, fast response, no disinfection by-products, and no harm to humans and animals. However, chlorine dioxide is prone to explosion, difficult to transport and store, and excessive dosage There is a potential risk of hypochlorite ions in the water body after disinfection, which will increase the cost of disinfection

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: Ultraviolet radiation dose test.

[0039] The irradiation intensity of the test is 7.76, 13.18, 17.03, 22.28, 28.5mw / cm 2 , the UV dose is 8, 16, 24, 32, 40, 48, 56, 64, 90mJ / cm 2 The disinfection effect of ultraviolet rays on the number of fecal coliforms and the total number of bacteria in water was tested under certain conditions.

[0040] The test water quality is as follows:

[0041]

[0042] The removal rate of ultraviolet rays on the number of fecal coliforms is as follows: figure 2 As shown, the inactivation rate of ultraviolet rays to fecal coliform bacteria in water increases with the increase of ultraviolet dose. When reaching the maximum value of 4.67log, the inactivation rate exceeds 99.99%, almost all the fecal coliform bacteria in the water body are killed, and the level of fecal coliform bacteria in the disinfected water is low.

[0043] When the irradiation dose is the same, the higher the intensity of ultraviolet irradiation, the ...

Embodiment 2

[0047] Embodiment 2: Chlorine dioxide dosing reaction time test.

[0048] The test uses the static beaker experiment to study the reaction time. Take 6 250ml beakers, pour 200ml water samples into the test, and number the beakers accordingly, and add 2, 3, 4 mg / L to the 5 beakers in turn. Add a certain amount of stable chlorine dioxide disinfection solution, and place it under the mixer to stir at a constant speed. During the test, the decontaminated water samples were tested for the number of fecal coliform bacteria when the reaction time was 2, 5, 10, 15, 20, 25, 30, and 35 minutes respectively.

[0049] The test water quality is as follows:

[0050]

[0051] Sufficiently long reaction time can ensure that the reaction of chlorine dioxide to kill living microorganisms is more thorough. When the concentration of chlorine dioxide is high, the inactivation effect can be achieved in a short period of time; low-concentration chlorine dioxide disinfection can also be achieved ...

Embodiment 3

[0055] Embodiment 3: Chlorine dioxide dosage test.

[0056] The test uses a static beaker test to study the disinfection effect of chlorine dioxide. Use a sterilized 250ml beaker to take several cups of test water samples of 100ml, and the dosage of chlorine dioxide is 1, 2, 3, 4, 5, 6, and 7mg respectively. / L, and the reaction time was 30 minutes, and the bactericidal effect of chlorine dioxide was studied. After 15 minutes, each water sample was taken immediately for microbial index detection.

[0057] Test water quality is the same as embodiment 2, and dosage is to the bactericidal effect of microorganism in water sample as follows: Figure 5 As shown, under the condition of constant reaction time, the inactivation rate of chlorine dioxide on the total number of bacteria and fecal coliform bacteria increases with the increase of the dosage of disinfectant. When the dosage continues to increase, the inactivation rate tends to be Stablize.

[0058] When the dosage is 3mg / L...

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Abstract

The invention discloses a disinfection method of recycled water, which is used for remote combined disinfection by using ultraviolet rays and chlorine dioxide. The disinfection method comprises the following steps: disinfecting recycled water with ultraviolet rays at first and then remotely disinfecting the ultraviolet-disinfected recycled water by using chlorine dioxide. According to the disinfection method, an ultraviolet disinfection method is combined with a chlorine dioxide disinfection method, so that the sterilizing capability is improved, the defects of independent ultraviolet disinfection are overcome, the dosage of a chlorine dioxide chemical preparation is reduced, and the potential risk of chlorine dioxide disinfection is lowered; due to use of the chlorine dioxide disinfection, the defect that the ultraviolet disinfection cannot realize continuous disinfection is overcome, and thus the disinfection capability of the system is further improved; moreover, fecal coliforms in a disinfected water body nearly cannot be photo-reactivated within 48 hours and are gradually reduced as time goes by, and the inactivation rate of the fecal coliforms and total bacteria in the recycled water is increased, so that the water quality safety of the recycled water in a recycling process can be ensured.

Description

technical field [0001] The invention relates to a disinfection method, in particular to a disinfection method for reclaimed water, belonging to the field of reclaimed water treatment. Background technique [0002] With the rapid development of my country's national economy and the acceleration of industrialization, the contradiction between the shortage of urban water resources and urban development has become increasingly serious, water pollution has become increasingly serious, and the cost of water resource development and sewage treatment has been increasing. The main idea of ​​these contradictions. [0003] The World Health Organization lists the bacteriological indicators of water bodies as water quality control indicators. The bacteriological indicators cover a wide range and are of various types. Some pathogenic microorganisms can cause illness and death of a large number of people at the same time. New pathogenic microorganisms such as Jia Water pollution accidents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/50
Inventor 王晓刘喜坤李晗杰陈红娟潘晓悦杨雅银刘倩张双圣
Owner 徐州市城区水资源管理处(徐州市城市节约用水办公室)
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