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Method for removing pollutants in water through stepwise catalytic oxidation-biological activated carbon-ultraviolet (UV) combination

A biological activated carbon and catalytic oxidation technology, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, light water/sewage treatment, etc., can solve the problems such as difficult to eliminate inorganic salts, and improve the utilization efficiency and removal efficiency of ozone , Reduce the effect of destroying the structure of natural organic matter

Active Publication Date: 2012-03-21
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that it is difficult to eliminate some polyhalides and high-valence inorganic salts in micro-polluted water source water by the combined process of advanced oxidation and biological activated carbon, and provides a method for removing pollutants in water by combining cascade catalytic oxidation-biological activated carbon-UV

Method used

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  • Method for removing pollutants in water through stepwise catalytic oxidation-biological activated carbon-ultraviolet (UV) combination
  • Method for removing pollutants in water through stepwise catalytic oxidation-biological activated carbon-ultraviolet (UV) combination

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specific Embodiment approach 1

[0014] Specific embodiment one: the method for the combined use of cascade catalytic oxidation-bioactivated carbon-UV in this embodiment to remove pollutants in water is carried out according to the following steps: 1. Make the water to be treated flow into the cascade catalytic oxidation reactor to carry out cascade catalytic oxidation, water flow The speed is 1~20m·h -1 ; Two, water flows out from the cascade catalytic oxidation reactor, and then flows into the biological activated carbon reactor, and the residence time in the biological activated carbon reactor is 5 to 240min; Three, the water flows out from the biological activated carbon reactor, and nitrogen is introduced into the water, and then Make water flow into the UV reactor and irradiate with ultraviolet light for 1 to 60 minutes to complete the cascade catalytic oxidation-biological activated carbon-UV combination to remove pollutants in water.

[0015] The schematic flow chart of the method of this embodiment i...

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the process of stepwise catalytic oxidation described in step one is: a, when the content of bromide ion in the water to be treated is no more than 0.2mg / L, divide into two processes The first process is to inject ozone into the water to be treated and treat it with catalyst A for 5-10 minutes. The second process is to inject ozone into the water treated in the first process and add catalyst B to react for 5-10 minutes; The mass ratio of catalyst A to catalyst B is 1:0.2-5, and the total dosage of ozone is 0.1-30mg L -1 , the ratio of the total moles of catalyst A and catalyst B to the moles of ozone is 1:0.001~1; b, when the bromide ion content in the water to be treated exceeds 0.2mg / L, it is carried out in three processes, the first process It is to pass ozone into the water to be treated and add catalyst A for 5-8 minutes. The second process is to pass ozone into the trea...

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the gas source of the ozone generator in step one adopts the oxygen separated by the air separator. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for removing pollutants in water through stepwise catalytic oxidation-biological activated carbon-ultraviolet (UV) combination. The method aims at solving the problem that the existing advanced oxidation-biological activated carbon combination technology is difficult to eliminate a few polyhalogenated substances and high-valence inorganic salts in water with micropollutants. The method comprises the following steps that 1, water needing to be treated enters into a stepwise catalytic oxidation reactor and is subjected to stepwise catalytic oxidation; 2, the water treated by the step 1 flows out from the stepwise catalytic oxidation reactor and flows into a biological activated carbon reactor; and 3, the water treated by the step 2 flows out from the biological activated carbon reactor; nitrogen is fed into the water; and the water with nitrogen is fed into an ultraviolet reactor and is subjected to ultraviolet light irradiation so that it is finished that pollutants in the water are removed through stepwise catalytic oxidation-biological activated carbon-UV combination. Through the method, removal rates of extremely refractory organic matters such as polyhalogenated substances and the like can reach 55%; and removal rates of perchlorates and periodates can reach 62%. The method is utilized for treatment on water with micropollutants.

Description

technical field [0001] The invention relates to a method for removing pollutants in water by combining cascade catalytic oxidation-biological activated carbon-UV. Background technique [0002] The problem of trace organic pollution in drinking water sources is becoming more and more prominent, and the traditional water treatment process of the water supply plant "coagulation-sedimentation-filtration-disinfection" is mainly used to remove turbidity, color and bacteria in water, and to macromolecules and colloids. The removal effect of substances is better, but the removal effect of trace organic pollutants is poor, usually 20% to 30%. Therefore, at present, the combined process of ozone oxidation and biological activated carbon is widely used in the world to remove trace organic pollutants in water source water, that is, the water containing trace organic pollutants is firstly treated by ozone oxidation, and then further purified by biological activated carbon. However, the ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/32C02F1/78
Inventor 马军刘正乾李旭春
Owner HARBIN INST OF TECH
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