Ultraviolet-chlorination agent sequentially disinfecting technology for reclaimed water

A technology of reused water and ultraviolet light, applied in the field of water treatment, can solve the problems of inability to guarantee the safety of reused water, threats to urban residents, etc., and achieve the effects of reducing protection, saving operating costs, and efficiently inactivating viruses

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Problems solved by technology

In recent years, water-borne diseases have occurred frequently in various parts of the world and in some domestic regions. If the safety of reused water cannot be guaranteed, it will pose a huge threat to urban residents.

Method used

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  • Ultraviolet-chlorination agent sequentially disinfecting technology for reclaimed water

Examples

Experimental program
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Effect test

Embodiment 1

[0036]Treat the reused water with the secondary effluent of urban sewage as the source water, and use a low-pressure mercury lamp to generate ultraviolet light to disinfect the reused water with a dose of 10mJ / cm 2 . Dosing sodium hypochlorite (NaClO) solution at the outlet of the ultraviolet light disinfection equipment, the dosage is 7mg / L [with Cl 2 (i.e. available chlorine, the same below)], the disinfection time is 15 minutes.

Embodiment 2

[0038] Treat the recycled water with the secondary effluent of urban sewage as the source water, and use high-pressure mercury lamps to generate ultraviolet light to disinfect the recycled water with a dose of 20mJ / cm 2 . Dosing chloramine solution at the outlet of the ultraviolet light disinfection equipment, the dosage is 3mg / L (as Cl 2 count), ready to use.

Embodiment 3

[0040] Treat the recycled water with the secondary effluent of urban sewage as the source water, add liquid chlorine 3mg / L to the recycled water, mix it well, and pass the water through the low-pressure mercury lamp ultraviolet disinfection equipment, and the ultraviolet radiation dose is 12mJ / cm 2 . Leave the water for 10 minutes before use.

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Abstract

A reuse-water disinfection method combining Ultraviolet with chlorination disinfectant is provided. The invention relates to a regenerated reuse-water purifying treatment technology after the municipal wastewater treatment. The method is implemented through combining the ultraviolet irradiation disinfection on the reuse-water with adding the chlorine-containing disinfectant in water, wherein, the dosage of the ultraviolet irradiation is 2-100mJ/cm<2>, and the amount of the added chlorine-containing disinfectant is 1-20mg/L in the chlorine containing amount. The synergistic effect caused by the combination of the two greatly improves the virus inactivation rate. The reuse-water can be ensured to be disinfected thoroughly and the quality safety of the reuse-water is improved.

Description

technical field [0001] The invention belongs to the water treatment technology, in particular to the purification treatment technology for the reclaimed water after urban sewage treatment. Background technique [0002] In the case of increasingly tense water resources, an effective way to solve the problem of urban water shortage is to regenerate and reuse urban sewage after treatment. Several five-year plans in my country in recent years have taken sewage reuse as a major research topic. Since 2001, sewage reuse has entered the start-up stage in an all-round way, and has become one of the necessary and inevitable directions for the development of my country's water industry. The purified urban sewage can be reused mainly as municipal greening, landscape water, industrial water and household flushing water. Different processes are required for different use requirements, and advanced treatment processes are required for higher water quality requirements. Although most path...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/50C02F1/32
Inventor 刘伟梁咏梅
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