Disinfection method of recycled water

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 ...

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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

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