CN111807501A - A continuous high-concentration ozone oxidation treatment sewage device and sewage treatment method thereof - Google Patents

Abstract

The invention relates to a sewage treatment device and a sewage treatment method by continuous high-concentration ozone oxidation, which consists of an ozone adding and recycling system, a hydraulic circulating system and a closed reaction tank; the ozone adding and recycling system comprises an ozone generator, a gas storage box, an air inlet valve, a gas flowmeter and a gas return pipeline; the hydraulic circulating system comprises a circulating pipeline, a water inlet valve, a circulating water pump, a liquid flowmeter, a reflux control valve, a pressure gauge, a Venturi tube, a water outlet valve and an aeration head; the top of the closed reaction tank is provided with a safety valve, a water adding valve and a pressure gauge; the ozone generator, the gas storage tank, the air inlet valve and the gas flowmeter are sequentially connected through a pipeline, the gas storage tank and the safety valve are connected through a gas return pipeline, and the gas flowmeter is connected with the Venturi tube through a pipeline. The invention depends on the power of the circulating water pump, is energy-saving and environment-friendly, is simple to operate, and can be widely applied to the oxidation treatment of the production sewage in small and medium-sized factories.

Description

A continuous high-concentration ozone oxidation treatment sewage device and sewage treatment method thereof

technical field

The invention relates to a continuous high-concentration ozone oxidation treatment sewage treatment device and a sewage treatment method thereof, which are used to improve the biodegradability of refractory industrial wastewater, and are also suitable for centralized oxidation treatment of urban industrial sewage, belonging to the technical field of organic wastewater oxidation treatment .

Background technique

Ozone is often used in industrial sewage treatment because of its good oxidation effect, no secondary pollution and high treatment efficiency. It can decompose macromolecules in organic wastewater into small molecular substances and improve the biodegradability of wastewater. The ability of ozone to oxidize organic wastewater is related to factors such as ozone concentration in water, temperature, pH value, contact area and reaction time. When the temperature and pH of water are constant, ozone concentration in water and its contact area with water are the most important factors affecting its oxidation ability. major factor.

There are two main methods of traditional ozone dosing, one is to directly aerate the water under normal pressure, and the other is to use the high-speed rotation of the impeller of the gas-liquid mixing pump to simultaneously inhale liquid and gas. The advantage of direct aeration is that ozone is less affected by the characteristics of the gas itself and has relatively strong resistance to decomposition. However, the ozone bubble diameter is large, the rising speed is fast, the residence time is short, the contact area with water is small, and the oxidation effect is poor. Into the water, because the gas-liquid mixing pump method can generate micro-nano bubbles, the gas can exist in the water for a long time, and the mass transfer efficiency is increased. At the same time, the micro-nano bubbles can promote the generation of hydroxyl radicals and further enhance the treatment effect. The disadvantage is that the amount of ozone absorbed by the mixing pump is small, and the ozone concentration in the water is still low. In addition, the gas-liquid mixing pump cycle has a process of atmospheric pressure release, which cannot continuously maintain a high-concentration ozone state, which affects the oxidation effect.

The chemical properties of ozone are lively. It can decompose by itself at normal temperature and pressure to generate oxygen. The half-life is about 15-30min, and it decomposes faster under high temperature conditions. Using an air compressor or an air pump to pressurize, the temperature of ozone rises rapidly after compression, and the residence time in the gas storage tank is long, resulting in violent decomposition, which reduces the ozone concentration in the gas source and loses the meaning of pressurized aeration.

According to Henry's law, when the temperature is constant, the solubility of gas in water is proportional to the equilibrium partial pressure, that is, the greater the pressure of the gas phase, the greater the solubility of the gas. Obviously, aeration of ozone in a pressurized state can improve its solubility in water. , thereby increasing the ozone concentration in the water. When the dissolved gas pressure reaches about 0.3Mpa, the gas (including ozone) will exist in the water in the form of micro-nano bubbles, and the contact area with water will also increase significantly. In addition, ozone is more soluble than other types of gases in the gas source (13 times that of oxygen), and other gases are more likely to escape during pressurized aeration, which increases the proportion of ozone in the gas dissolved in water. The cavitation effect of the micro-nano bubbles during the release can promote the generation of hydroxyl radicals and further enhance their oxidative ability. It can be seen that ozone pressurized aeration has the functions of increasing the ozone concentration in water, increasing the ozone contact area, and strengthening the oxidation of micro-nano bubbles.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the deficiencies of the prior art, and to provide a continuous high-concentration ozone oxidation treatment sewage device and a sewage treatment method thereof.

The object of the present invention is achieved in this way, a continuous high-concentration ozone oxidation treatment sewage device is characterized in that it is composed of an ozone dosing and recycling system, a hydraulic circulation system, and a closed reaction tank;

The ozone dosing and recycling system includes an ozone generator, a gas storage box, an intake valve, a gas flow meter, and a gas return pipeline;

The hydraulic circulation system includes a circulation pipeline, a water inlet valve, a circulating water pump, a liquid flow meter, a backflow control valve, a pressure gauge, a venturi pipe, a water outlet valve, and an aeration head;

The top of the closed reaction tank is provided with a safety valve, a water adding valve and a pressure gauge, and the bottom of the closed reaction tank is provided with a drain valve;

The ozone generator, the gas storage box, the intake valve, and the gas flowmeter are connected through the pipeline in turn, and the gas storage box and the safety valve are connected through the gas return pipeline, and the gas flowmeter is connected with the Venturi tube through the pipeline;

The water inlet of the circulation pipeline in the hydraulic circulation system is connected to the side wall of the closed reaction tank, and the water inlet of the circulation pipeline is connected with the closed reaction tank, and the water outlet of the circulation pipeline extends into the closed reaction tank , and the water outlet of the circulating pipeline extending to the closed reaction tank is provided with an aeration head that is throughly connected to the circulating pipeline; the water inlet valve, circulating water pump, liquid flow meter, return control valve, pressure gauge, venturi The pipe and the water outlet valve are installed on the circulating pipeline in turn, and are arranged along the water inlet of the circulating pipeline to the direction of the aeration head;

There is also a backflow control valve pipeline, the water outlet of the backflow control valve pipeline is connected to the circulation pipeline on one side of the circulating water pump, and the water inlet of the backflow control valve pipeline is connected to the circulating pipeline on the other side of the circulating water pump, and the return flow The water inlet of the control valve pipeline is connected to the circulating pipeline between the circulating water pump and the liquid flow meter; the backflow control valve is installed on the backflow control valve pipeline.

The upper and lower sides of the closed reaction tank are sealed with flanges.

The water inlet of the circulation pipeline is connected to the middle of the side wall of the closed reaction tank.

The safety valve is a constant pressure slow release valve.

Turn on the ozone generator, the ozone generated by the ozone generator enters the gas storage tank, and the ozone is stored in the gas storage tank; at the same time, close the water inlet valve, the water outlet valve and the drain valve, open the water filling valve, and add the sewage to be treated in the closed reaction tank , keep the liquid level of the sewage to be treated submerged the water inlet of the circulating pipeline, and close the water filling valve;

Open the water inlet valve and the water outlet valve, start the circulating water pump, the waste water to be treated in the closed reaction tank is sucked through the water inlet of the circulating pipeline, and then discharged to the aeration head through the circulating water pump, liquid flow meter, pressure gauge, Venturi tube, and water outlet valve. And return to the closed reaction tank through the aeration head;

By adjusting the return flow control valve, the return flow is controlled and measured by the liquid flow meter. The pressure on the circulation pipeline is displayed by the pressure gauge. The Venturi tube works through the hydraulic circulation. of ozone;

The venturi tube inhales ozone from the gas storage tank, and the ozone and the wastewater to be treated form a water vapor mixture in the venturi tube, which is discharged to the aeration head through the water outlet valve, and is aerated through the aeration head, and the air bubbles rise to the water surface in the closed reaction tank Above, with the continuous operation of the circulating water pump, the gas volume in the upper part of the closed reaction tank increases, and the pressure increases. When the set pressure is reached, the safety valve starts to exhaust, and the exhausted ozone tail gas enters the gas storage tank through the gas return line. Recycling; after that, the pressure in the closed reaction tank is stable, realizing continuous pressure-stabilized ozone aeration and strengthening the ozone oxidation capacity.

Open the drain valve to drain the water after sewage treatment in the closed reaction tank.

The present invention has reasonable structure and advanced and scientific methods. Through the present invention, a continuous high-concentration ozone oxidation treatment sewage treatment device and sewage treatment method thereof are provided. Tank composition, ozone dosing and recycling system includes ozone generator, gas storage tank, gas flow meter, recycling pipeline; hydraulic circulation system includes circulating water pump, return adjustment, liquid flow meter, pressure gauge, Venturi tube and valve; the bottom of the closed reaction tank is equipped with an aeration head and a drain valve, and the upper part is equipped with a pressure gauge, a water inlet valve and a safety valve; the upper and lower parts of the closed reaction tank are sealed with flanges. The water inlet of the hydraulic circulation system is in the middle of the closed reaction tank, and the water outlet is at the bottom of the closed reaction tank. The closed reaction tank is provided with an aeration head for enhancing gas-water mixing. The safety valve set at the top of the closed reaction tank is a constant pressure slow release valve.

Working principle: First, add the waste water to be treated into the closed reaction tank to keep the liquid level submerged in the water inlet pipe. Close the water inlet valve, start the ozone generation system, the generated ozone enters the air storage tank, and then start the circulating water pump, the venturi meter inhales ozone from the air storage tank to form a water-vapor mixture, which is aerated by the aeration head, and the bubbles rise above the water surface. With the continuous operation of the circulating pump, the gas volume in the upper part of the closed reaction tank increases, and the pressure increases. When the set pressure is reached, the constant pressure slow-release valve starts to exhaust, and the exhausted ozone tail gas enters the gas storage tank for recycling. After that, the pressure in the closed reaction tank is stable, realizing continuous pressure-stabilized ozone aeration and strengthening the ozone oxidation capacity.

The present invention has the following innovations and features:

1. Ozone is added to the wastewater in real time without compression, and the ozone concentration of the gas source is attenuated little, realizing continuous pressure-stabilizing and circulating aeration, which can greatly increase the ozone concentration in the water and increase the contact area between ozone and wastewater.

2. The circulating water pump pumps and discharges water in a closed reaction tank. The pressure head at the inlet and outlet is equal. The circulation process only needs to overcome the local head loss, with low lift and low energy consumption, which improves the processing capacity.

3. The ozone tail gas enters the gas storage tank and is recycled, which improves the ozone utilization efficiency.

According to Henry's law, when the temperature is constant, the solubility of gas in water is proportional to the equilibrium partial pressure, that is, the greater the pressure of the gas phase, the greater the solubility of the gas. Obviously, aeration of ozone in a pressurized state can improve its solubility in water. , thereby increasing the ozone concentration in the water. When the dissolved gas pressure reaches about 0.3Mpa, the gas (including ozone) will exist in the water in the form of micro-nano bubbles, and the contact area with water will also increase significantly. In addition, ozone is more soluble than other types of gases in the gas source (13 times that of oxygen), and other gases are more likely to escape during pressurized aeration, which increases the proportion of ozone in the gas dissolved in water. The cavitation effect of the micro-nano bubbles during the release can promote the generation of hydroxyl radicals and further enhance their oxidative ability. It can be seen that ozone pressurized aeration has the functions of increasing the ozone concentration in water, increasing the ozone contact area, and strengthening the oxidation of micro-nano bubbles. A circulating water pump is used to inhale ozone into the venturi tube, and the gas is added to the waste water in real time without compression. The ozone concentration of the gas source is attenuated little, and the continuous pressure-stabilizing and circulating aeration can be realized, which can greatly increase the ozone concentration in the water and increase the ozone and waste water. Contact area. Use the gas recovery pipeline to recycle the exhaust gas to reduce pollution.

The power of the device for continuously maintaining high-concentration ozone oxidation treatment of sewage is the circulating water pump, which is energy-saving, environmentally friendly and simple to operate, and can be widely used in the oxidation treatment of production sewage in small and medium-sized factories to improve its biodegradability. Advanced treatment provides good working conditions and has great practicability and social and economic benefits.

Description of drawings

Fig. 1 is the structural representation of the present invention;

In the picture: 1 inlet valve, 2 circulating water pump, 3 liquid flow meter, 4 return control valve, 5 pressure gauge, 6 venturi tube, 7 outlet valve, 8 aeration head, 9 closed reaction tank, 10 safety valve, 11 water adding valve, 12 pressure gauge, 13 ozone generator, 14 gas storage tank, 15 inlet valve, 16 gas flow meter, 17 drain valve, 18 gas return pipeline.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and the description of the accompanying drawings.

A continuous high-concentration ozone oxidation treatment sewage device is composed of an ozone dosing and recycling system, a hydraulic circulation system, and a closed reaction tank 9; the ozone dosing and recycling system includes an ozone generator 13, a gas storage tank 14, an inlet Gas valve 15, gas flow meter 16, gas return pipeline 18; hydraulic circulation system includes circulation pipeline, water inlet valve 1, circulating water pump 2, liquid flow meter 3, return control valve 4, pressure gauge 5, Venturi tube 6 , a water outlet valve 7, aeration head 8; the top of the closed reaction tank 9 is provided with a safety valve 10, a water valve 11, and a pressure gauge 12, and the bottom of the closed reaction tank 9 is provided with a drain valve 17.

The ozone generator 13, the gas storage box 14, the intake valve 15, and the gas flow meter 16 are connected through the pipeline in turn, and the gas storage box 14 and the safety valve 10 are connected through the gas return pipeline 18, and the gas flow meter 16 is connected with the venturi through the pipeline. The inner pipe 6 is connected; the water inlet of the circulation pipe in the hydraulic circulation system is connected to the side wall of the closed reaction tank 9, and the water inlet of the circulation pipe is connected with the closed reaction tank 9, and the water outlet of the circulation pipe extends to Inside the closed reaction tank 9, and the water outlet extending from the circulation pipeline to the closed type reaction tank 9 is provided with an aeration head 8 that is throughly connected to the circulation pipeline; a water inlet valve 1, a circulating water pump 2, a liquid flow meter 3, The backflow control valve 4, the pressure gauge 5, the venturi tube 6, and the water outlet valve 7 are installed on the circulation pipeline in turn, and are arranged along the water inlet of the circulation pipeline toward the aeration head 8; The water outlet of the control valve pipeline is connected to the circulating pipeline on one side of the circulating water pump 2, the water inlet of the return control valve pipeline is connected to the circulating pipeline on the other side of the circulating water pump 2, and the water inlet of the return control valve pipeline is connected On the circulating pipeline between the circulating water pump 2 and the liquid flow meter 3; the backflow control valve 4 is installed on the backflow control valve pipeline.

Further, the closed reaction tank 9 is sealed with flanges up and down. The water inlet of the circulation pipeline is connected to the middle of the side wall of the closed reaction tank 9 . The safety valve 10 is a constant pressure slow release valve.

When in use, open the ozone generator 13, the ozone generated by the ozone generator 13 enters the gas storage tank 14, and the ozone is stored in the gas storage tank 14; at the same time, close the water inlet valve 1, the water outlet valve 7 and the drain valve 17, and open the water filling valve 11. , add the sewage to be treated in the closed reaction tank 9, keep the liquid level of the sewage to be treated submerged the water inlet of the circulation pipeline, and close the water adding valve 11.

Open the water inlet valve 1 and the water outlet valve 7, start the circulating water pump 2, the waste water to be treated in the closed reaction tank 9 is sucked through the water inlet of the circulating pipeline and passed through the circulating water pump 2, liquid flow meter 3, pressure gauge 5, Venturi tube 6, The water outlet valve 7 is discharged to the aeration head 8, and is returned to the closed reaction tank 9 through the aeration head 8; by adjusting the return flow control valve 4, the return flow is controlled, and measured by the liquid flow meter 3, the pressure on the circulation pipeline It is shown by the pressure gauge 5 that the Venturi tube 6 works through the hydraulic cycle, and the Venturi tube 6 absorbs the ozone generated by the ozone generator 13 in the gas storage tank 14; the venturi tube 6 inhales ozone from the gas storage box 14, and the ozone and The treated wastewater forms a water-vapor mixture in the venturi tube 6, and is discharged to the aeration head 8 through the water outlet valve 7, and is aerated through the aeration head 8, and the air bubbles rise above the water surface in the closed reaction tank 9. Continuous operation, the gas volume in the upper part of the closed reaction tank 9 increases, and the pressure increases. When the set pressure is reached, the safety valve 10 starts to exhaust, and the exhausted ozone tail gas enters the gas storage tank 14 through the gas return line 18, and is recycled; After that, the pressure in the closed reaction tank 9 is stabilized, so that continuous pressure-stabilized ozone aeration is realized, and the ozone oxidation ability is strengthened. The treated water in the closed reaction tank 9 can be discharged by opening the drain valve 17 .

As shown in Figure 1, this sustainable high-concentration ozone oxidation treatment sewage treatment device, the ozone dosing and recycling system includes an ozone generator 13, a gas storage tank 14, an intake valve 15, a gas flow meter 16 and the like. A gas return pipeline 18 is provided between the gas storage tank 14 and the safety valve 10; the hydraulic circulation system includes a water inlet valve 1, a circulating water pump 2, a liquid flow meter 3, a return control valve 4, a pressure gauge 5, and a venturi tube. 6. The water outlet valve 7 and the aeration head 8; the closed reaction tank 9 is provided with a safety valve 10, a water addition valve 11, and a pressure gauge 12; the bottom end of the reaction column 9 is provided with a drain valve 17.

The working principle of the sewage treatment device for sustainably maintaining high-concentration ozone oxidation treatment: open the ozone generator 13, store ozone in the gas storage tank 14, close the water inlet valve 1, the water outlet valve 7 and the drain valve 17 at the same time, and open the water filling valve 11. The sewage to be treated is added to the closed reaction tank 9, and the water adding valve 11 is closed after adding an appropriate amount of sewage. Open the water inlet valve 1 and outlet valve 7 of the hydraulic circulation pipeline, start the circulating water pump 2, control the return flow by adjusting the backflow control valve 4, and measure it through the liquid flow meter 3, the pressure on the pipeline is displayed by the pressure gauge 5, The Venturi tube 6 is operated by the hydraulic circulation, and the ozone generated by the ozone generator 13 in the gas storage tank 14 is absorbed. The intake valve 15 adjusts the flow rate, and the gas flow meter 16 measures the value. The valve 10 is discharged; the discharged ozone is re-entered into the gas storage tank 14 through the gas return line 18; the aeration head 8 can enhance the water-gas contact area during the water-gas mixing process; keep the circulating water pump 2 working continuously, and after a period of time the gas is dissolved, The drain valve 18 can be opened to discharge.

In the present invention, high-concentration ozone is continuously added to the closed reaction tank, and at the same time, the safety valve discharges the floating excess gas, a certain pressure is maintained in the closed reaction tank, and the sewage and ozone are fully contacted for a period of time to degrade the substances in the sewage. Ozone is added to the wastewater in real time without compression, and the ozone concentration of the gas source is attenuated little, realizing continuous pressure-stabilizing and circulating aeration, which can greatly increase the ozone concentration in the water and increase the contact area between ozone and wastewater. Ozone achieves the effect of dissolving gas in the closed reaction tank, and can generate micro-nano bubbles after being released. The circulating water pump 2 is used to circulate the sewage, the venturi tube 4 is used to inhale the ozone, and the aeration head is used to release the ozone. The upper part of the closed reaction tank is provided with a safety valve 10, which can be adjusted according to the set pressure. When the pressure is higher than the set value, the safety valve can discharge the excess floating gas, and the gas is recovered to the gas storage tank through the gas return line in reuse.

Claims (6)

1. A continuous high-concentration ozone oxidation treatment sewage device is characterized in that, it is composed of an ozone dosing and recycling system, a hydraulic circulation system, and a closed reaction tank (9); The ozone dosing and recycling system includes an ozone generator (13), a gas storage tank (14), an intake valve (15), a gas flow meter (16), and a gas return line (18); The hydraulic circulation system comprises a circulation pipeline, a water inlet valve (1), a circulating water pump (2), a liquid flow meter (3), a backflow control valve (4), a pressure gauge (5), a venturi pipe (6), Outlet valve (7), aeration head (8); The top of the closed reaction tank (9) is provided with a safety valve (10), a water adding valve (11), a pressure gauge (12), and the bottom of the closed reaction tank (9) is provided with a drain valve (17); The ozone generator (13), the gas storage box (14), the air inlet valve (15), and the gas flow meter (16) are connected through the pipeline in turn, and the gas storage box (14) and the safety valve (10) are connected through the gas The return pipeline (18) is connected, and the gas flow meter (16) is connected with the venturi tube (6) through the pipeline; The water inlet of the circulation pipeline in the hydraulic circulation system is connected to the side wall of the closed reaction tank (9), and the water inlet of the circulation pipeline is connected with the closed reaction tank (9), and the water outlet of the circulation pipeline extends into the closed reaction tank (9), and the water outlet of the circulation pipeline extending to the closed reaction tank (9) is provided with an aeration head (8) that is throughly connected to the circulation pipeline; the water inlet valve (1 ), circulating water pump (2), liquid flow meter (3), backflow control valve (4), pressure gauge (5), venturi tube (6), and water outlet valve (7) are installed on the circulating pipeline in sequence, and are installed along the The water inlet of the circulation pipeline is arranged in the direction of the aeration head (8); There is also a backflow control valve pipeline, the water outlet of the backflow control valve pipeline is connected with the circulating pipeline on one side of the circulating water pump (2), and the water inlet of the backflow control valve pipeline is connected with the circulating pipeline on the other side of the circulating water pump (2). and the water inlet of the backflow control valve pipeline is connected to the circulating pipeline between the circulating water pump (2) and the liquid flow meter (3); the backflow control valve (4) is installed on the backflow control valve pipeline. 2 . The continuous high-concentration ozone oxidation treatment sewage treatment device according to claim 1 , wherein the closed reaction tank ( 9 ) is sealed with flanges up and down. 3 . 3 . A continuous high-concentration ozone oxidation treatment device for sewage according to claim 1 , wherein the water inlet of the circulation pipeline is connected to the middle of the side wall of the closed reaction tank ( 9 ). 4 . 4 . The continuous high-concentration ozone oxidation treatment sewage treatment device according to claim 1 , wherein the safety valve ( 10 ) is a constant-pressure slow-release valve. 5 . 5. The sewage treatment method using a continuous high-concentration ozone oxidation treatment sewage treatment device according to any one of claims 1-4, wherein the ozone generator (13) is turned on, and the ozone generator (13) generates The ozone enters the gas storage tank (14), and the ozone is stored in the gas storage tank (14). The sewage to be treated is added into the closed reaction tank (9), the liquid level of the sewage to be treated is kept to submerge the water inlet of the circulation pipeline, and the water adding valve (11) is closed; Open the water inlet valve (1) and the water outlet valve (7), start the circulating water pump (2), the waste water to be treated in the closed reaction tank (9) is sucked into the circulating water pump (2), the liquid flow meter ( 3) The pressure gauge (5), the venturi tube (6), and the water outlet valve (7) are discharged to the aeration head (8), and are returned to the closed reaction tank (9) through the aeration head (8); By adjusting the return control valve (4), the return flow is controlled and measured by the liquid flow meter (3), the pressure on the circulation pipeline is displayed by the pressure gauge (5), and the Venturi tube (6) is made to work through the hydraulic circulation, the venturi The inner pipe (6) absorbs the ozone generated by the ozone generator (13) in the air storage box (14); The venturi tube (6) inhales ozone from the gas storage tank (14), and the ozone and the waste water to be treated form a water-air mixture in the venturi tube (6), which is discharged to the aeration head (8) through the water outlet valve (7), and the After aeration by the aeration head (8), the air bubbles rise above the water surface in the closed reaction tank (9). With the continuous operation of the circulating water pump (2), the gas volume in the upper part of the closed reaction tank (9) increases, and the pressure increases. When the set pressure is reached, the safety valve (10) begins to exhaust, and the exhausted ozone tail gas enters the gas storage tank (14) through the gas return line (18) for recycling; after that, the closed reaction tank (9) The pressure is stable, and the continuous pressure-stabilized ozone aeration is realized, and the ozone oxidation ability is strengthened. 6 . The method according to claim 5 , wherein the treated water in the closed reaction tank ( 9 ) can be discharged by opening the drain valve ( 17 ). 7 .

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