Water treatment method and device for catalytic ozone oxidation

Abstract

The invention provides a catalytic ozonation water treatment method and an apparatus thereof. The method comprises the following steps: adding a catalyst to wastewater to be treated, allowing the wastewater to enter an ozone reaction tower, and uniformly spraying the wastewater through a water distributing device to make the wastewater sequentially go through trays at different levels in the tower, reach a water outlet at the bottom of the tower and flow out of the tower; and allowing ozone to enter the reaction tower from a gas distributing tube at the bottom of the reaction tower and to contact and react with the wastewater and the catalyst through the holes or bell jars of the trays at different levels, discharging tail gas from the top of the tower after the reaction ends, processing residual ozone through a tail gas absorbing device arranged at the tail end of a gas discharging tube, and discharging the processed gas to air in order to complete the treatment process. The method and the apparatus greatly improve the organic wastewater and sewage purifying reaction rate of ozone, and improve the utilization rate of ozone.

Description

technical field

[0001] The invention relates to the technical field of ozone contact reaction treatment of sewage and waste water, in particular to a water treatment method and device for catalytic ozone oxidation. technical background

[0002] In recent years, with the development of industry, new problems have emerged in water treatment and water pollution control. In many cases, industrial wastewater must undergo pre-oxidation or tertiary advanced treatment to meet the requirements of water pollution control and wastewater reuse. As one of the effective wastewater pre-oxidation and advanced treatment methods, ozone has a series of advantages such as strong oxidation ability, fast reaction speed, convenient use, and no secondary pollution, so it has been valued by people.

[0003] Ozone is a strong oxidant, it can oxidize a variety of organic and inorganic substances, and remove poisons that are sensitive to the high oxidation activity of ozone, such as phenols, benzene r...

Examples

Embodiment 1

[0037] The printing and dyeing wastewater containing refractory organic matter orange G (OG) was passed into the reaction tower, the pH value of the wastewater was 3.0, the concentration of ozone in the reaction tower was 100 mg / L, the concentration of sodium sulfite was 500 mg / L, and the treatment time was 1 min. Compared with no catalyst, the removal rate of organic matter orange G increased from 10% to 99%.

[0038] figure 2 It is the removal effect diagram of printing and dyeing wastewater containing refractory organic matter orange G (OG) in this example. The left column in the figure shows the removal rate of organic matter without adding catalyst, and the right column shows the removal rate of organic matter when catalyst is added.

Embodiment 2

[0040] The pharmaceutical wastewater containing caffeine is passed into the reaction tower, and the pH value of the wastewater is 3.0. The concentration of ozone in the reaction tower was 100 mg / L, the concentration of potassium sulfite was 50 mg / L, and the treatment time was 0.02 min. Compared with that without catalyst, the removal rate of caffeine increased from 1% to 39%.

[0041] image 3 It is the picture of the removal effect of pharmaceutical wastewater containing caffeine in this example. The left column in the figure shows the removal rate of organic matter when no catalyst is added, and the right column shows the removal rate of organic matter when catalyst is added.

Embodiment 3

[0043] The coal chemical industry wastewater containing refractory organic matter phenol is passed into the reaction tower, and the pH value of the wastewater is 4.0. The concentration of ozone in the reaction tower was 50 mg / L, the concentration of sodium bisulfite was 10 mg / L, and the treatment time was 0.01 min. Compared with that without adding catalyst, the removal rate of organic phenol increased from 2% to 35%.

technical field

[0001] The invention relates to the technical field of ozone contact reaction treatment of sewage and waste water, in particular to a water treatment method and device for catalytic ozone oxidation. technical background

[0002] In recent years, with the development of industry, new problems have emerged in water treatment and water pollution control. In many cases, industrial wastewater must undergo pre-oxidation or tertiary advanced treatment to meet the requirements of water pollution control and wastewater reuse. As one of the effective wastewater pre-oxidation and advanced treatment methods, ozone has a series of advantages such as strong oxidation ability, fast reaction speed, convenient use, and no secondary pollution, so it has been valued by people.

[0003] Ozone is a strong oxidant, it can oxidize a variety of organic and inorganic substances, and remove poisons that are sensitive to the high oxidation activity of ozone, such as phenols, benzene r...

Examples

Embodiment 1

[0037] The printing and dyeing wastewater containing refractory organic matter orange G (OG) was passed into the reaction tower, the pH value of the wastewater was 3.0, the concentration of ozone in the reaction tower was 100 mg / L, the concentration of sodium sulfite was 500 mg / L, and the treatment time was 1 min. Compared with no catalyst, the removal rate of organic matter orange G increased from 10% to 99%.

[0038] figure 2 It is the removal effect diagram of printing and dyeing wastewater containing refractory organic matter orange G (OG) in this example. The left column in the figure shows the removal rate of organic matter without adding catalyst, and the right column shows the removal rate of organic matter when catalyst is added.

Embodiment 2

[0040] The pharmaceutical wastewater containing caffeine is passed into the reaction tower, and the pH value of the wastewater is 3.0. The concentration of ozone in the reaction tower was 100 mg / L, the concentration of potassium sulfite was 50 mg / L, and the treatment time was 0.02 min. Compared with that without catalyst, the removal rate of caffeine increased from 1% to 39%.

[0041] image 3 It is the picture of the removal effect of pharmaceutical wastewater containing caffeine in this example. The left column in the figure shows the removal rate of organic matter when no catalyst is added, and the right column shows the removal rate of organic matter when catalyst is added.

Embodiment 3

[0043] The coal chemical industry wastewater containing refractory organic matter phenol is passed into the reaction tower, and the pH value of the wastewater is 4.0. The concentration of ozone in the reaction tower was 50 mg / L, the concentration of sodium bisulfite was 10 mg / L, and the treatment time was 0.01 min. Compared with that without adding catalyst, the removal rate of organic phenol increased from 2% to 35%.

Images