阅读说明：本技术 一种悬浮催化剂催化氧化煤化工废水的装置 (Device for catalytic oxidation of coal chemical wastewater by using suspension catalyst ) 是由 徐春艳 朱昊 韩洪军 于 2019-10-25 设计创作，主要内容包括：一种悬浮催化剂催化氧化煤化工废水的装置,涉及一种催化氧化煤化工废水的装置。本发明是要解决目前高级氧化技术在处理煤化工废水时催化剂固定在催化氧化塔内,固定催化剂在水体中较难分离的技术问题。本发明是由催化剂储存罐、进水泵、催化氧化塔、臭氧发生器、气水分布器、纳米挡网、臭氧尾气破坏器、电磁线圈、循环泵和进催化剂泵组成。本发明的催化氧化塔内的催化剂呈悬浮状态,增加了臭氧与催化剂的碰撞几率,大幅提高了煤化工废水中污染物的去除效能；本发明采用电磁型圈对催化氧化塔内的磁性臭氧催化剂进行回收,该过程操作简单且无二次污染。(A device for catalytic oxidation of coal chemical wastewater by using a suspension catalyst relates to a device for catalytic oxidation of coal chemical wastewater. The invention aims to solve the technical problem that a catalyst is fixed in a catalytic oxidation tower when the coal chemical industry wastewater is treated by the prior advanced oxidation technology, and the fixed catalyst is difficult to separate in a water body. The invention is composed of a catalyst storage tank, a water inlet pump, a catalytic oxidation tower, an ozone generator, a gas-water distributor, a nanometer blocking net, an ozone tail gas destructor, an electromagnetic coil, a circulating pump and a catalyst inlet pump. The catalyst in the catalytic oxidation tower is in a suspension state, so that the collision probability of ozone and the catalyst is increased, and the removal efficiency of pollutants in the coal chemical wastewater is greatly improved; the invention adopts the electromagnetic ring to recover the magnetic ozone catalyst in the catalytic oxidation tower, and the process is simple to operate and has no secondary pollution.)

1. A device for catalytic oxidation of coal chemical wastewater by using a suspended catalyst is characterized by consisting of a catalyst storage tank (1), a water inlet pump (2), a catalytic oxidation tower (3), an ozone generator (4), a gas-water distributor (5), a nanometer blocking net (6), an ozone tail gas destructor (7), an electromagnetic coil (8), a circulating pump (9) and a catalyst inlet pump (10);

the liquid outlet of the catalyst storage tank (1) is communicated with the liquid inlet of the catalyst inlet pump (10), the liquid outlet of the catalyst inlet pump (10) is communicated with the liquid inlet of the catalytic oxidation tower (3), and the liquid inlet of the catalytic oxidation tower (3) is arranged in the middle of the side wall of the catalytic oxidation tower (3); a water outlet of the water inlet pump (2) is communicated with a first water inlet of the catalytic oxidation tower (3), and the first water inlet is arranged at the bottom of the catalytic oxidation tower (3); the top of the catalytic oxidation tower (3) is provided with a small cover body (3-1); the upper part of the side wall of the catalytic oxidation tower (3) is provided with a nanometer blocking net (6); a stirring device is arranged in the catalyst storage tank (1); the catalyst in the catalyst storage tank (1) is a mixed solution of Fe/sludge-based activated carbon and water, the particle size of the Fe/sludge-based activated carbon is 0.05-0.06 mm, and the concentration of the Fe/sludge-based activated carbon in the mixed solution of the Fe/sludge-based activated carbon and water is 1-1.5 g/L;

the gas-water distributor (5) consists of a main gas inlet pipe (5-1), a support plate (5-2), a plurality of branch gas inlet pipes (5-3) and a plurality of gas outlet pipes (5-4); the plurality of branch air inlet pipes (5-3) are fixed on the upper surface of the support plate (5-2); a plurality of water inlet holes (5-5) are uniformly distributed on the supporting disc (5-2); the air outlet of the main air inlet pipe (5-1) is respectively communicated with the air inlets of all the branch air inlet pipes (5-3), and each branch air inlet pipe (5-3) is provided with a plurality of air outlet pipes (5-4) which are vertically upward; the side wall of the support disc (5-2) is fixed at the middle lower part of the inner wall of the catalytic oxidation tower (3), the main air inlet pipe (5-1) and the branch air inlet pipes (5-3) are on the same horizontal plane, and the main air inlet pipe (5-1) penetrates through the side wall of the catalytic oxidation tower (3) and is sealed with the side wall of the catalytic oxidation tower (3); the aperture of the water inlet (5-5) is smaller than the grain diameter of Fe/sludge-based activated carbon in the catalyst storage tank (1);

the air outlet of the ozone generator (4) is communicated with a main air inlet pipe (5-1) of the air and water distributor (5); an air outlet at the top of the catalytic oxidation tower (3) is communicated with an air inlet of the ozone tail gas destructor (7); a water outlet is arranged at the position of the nanometer blocking net (6) on the side wall of the catalytic oxidation tower (3), one part of the outlet water of the water outlet is discharged out of the device, the other part of the outlet water is communicated with a water inlet of a circulating pump (9), the water outlet of the circulating pump (9) is communicated with a second water inlet of the catalytic oxidation tower (3), and the second water inlet is arranged at the middle lower part of the side wall of the catalytic oxidation tower (3) and below the gas-water distributor (5); the electromagnetic coil (8) is arranged outside the catalytic oxidation tower (3).

2. The device for catalytic oxidation of coal chemical industry wastewater by using suspended catalyst according to claim 1, wherein the water inlet pump (2) is a peristaltic pump.

3. The device for catalytic oxidation of coal chemical industry wastewater by using a suspended catalyst according to claim 1, wherein the diameter of the nanometer blocking net (6) is 50 nm.

4. The apparatus for catalytic oxidation of coal chemical industry wastewater by using suspended catalyst according to claim 1, wherein the plurality of branched inlet pipes (5-3) are fixed on the upper surface of the support plate (5-2) by welding and are uniformly distributed.

5. The device for catalytic oxidation of coal chemical industry wastewater by using the suspended catalyst as claimed in claim 1, wherein the preparation method of the Fe/sludge-based activated carbon comprises the following steps: completely soaking the residual sludge in the secondary sedimentation tank into 1mol/L ferric nitrate aqueous solution, stirring for 24 hours at room temperature by using a stirrer under the condition that the rotating speed is 150rpm, placing the precipitate in a constant-temperature drying box, and drying at 105 ℃; placing the dried sample in a muffle furnace which is continuously filled with high-purity nitrogen and is isolated from air, calcining for 2h at 500 ℃, cleaning impurities of the calcined sample by using ultrapure water, finally grinding to the particle size of 0.05mm, and drying to obtain Fe/sludge-based activated carbon; the mass of the residual sludge in the secondary sedimentation tank is equal to that of 1mol/L ferric nitrate aqueous solution.

Technical Field

The invention relates to a device for catalytic oxidation of coal chemical wastewater.

Background

After pretreatment and biological treatment, toxic and non-biodegradable pollutants still exist in secondary effluent of coal chemical wastewater, so that the wastewater cannot reach the discharge standard, and the advanced treatment is necessary to meet increasingly strict discharge standards.

At present, researchers use a plurality of means to deeply treat secondary effluent of coal chemical wastewater, such as a coagulation method, an adsorption method, biological treatment, advanced oxidation and the like. Although the coagulation method can effectively reduce the chroma and turbidity of the wastewater, the coagulant has certain corrosivity to a water treatment pipeline, the adding amount of the coagulant needs to be strictly controlled, the treatment is improper, even secondary pollution is caused, and in addition, a large amount of sludge is generated in the coagulation and precipitation process. The adsorption method can simply and efficiently adsorb pollutants in the wastewater, but the problems of high regeneration cost, secondary pollution and the like of the adsorbent limit the large-scale application of the adsorbent in the advanced treatment of the wastewater in the coal chemical industry. Biological treatment is economically viable, but the presence of nonbiodegradable contaminants in the secondary effluent of coal chemical wastewater tends to inhibit the growth of microorganisms. The secondary sedimentation tank has high sludge treatment cost, and the large accumulation of the sludge not only occupies land resources, but also pollutes the atmosphere, water bodies and soil. Therefore, the method has important practical significance for zero discharge of the coal chemical wastewater by exploring an efficient, economic and stable advanced treatment technology.

The advanced oxidation technology has great progress in treating toxic and nonbiodegradable wastewater, has simple and rapid operation and no secondary pollution, can generate OH with strong oxidizing capability, and has more efficient treatment effect. With the progress of research, it was found that the catalytic ozonation technology can generate a large amount of free radicals. However, most devices fix the catalyst in the catalytic oxidation tower, so that the catalytic function of the catalyst is not fully exerted, and the fixed catalyst is difficult to separate in a water body.

Disclosure of Invention

The invention provides a device for catalytic oxidation of coal chemical wastewater by using a suspended catalyst, and aims to solve the technical problems that the catalytic function of the catalyst is not fully exerted and the fixed catalyst is difficult to separate in a water body because the catalyst is fixed in a catalytic oxidation tower when the coal chemical wastewater is treated by the prior advanced oxidation technology.

The device for catalytic oxidation of coal chemical wastewater by using a suspended catalyst comprises a catalyst storage tank 1, a water inlet pump 2, a catalytic oxidation tower 3, an ozone generator 4, a gas-water distributor 5, a nanometer blocking net 6, an ozone tail gas destructor 7, an electromagnetic coil 8, a circulating pump 9 and a catalyst inlet pump 10;

the liquid outlet of the catalyst storage tank 1 is communicated with the liquid inlet of a catalyst inlet pump 10, the liquid outlet of the catalyst inlet pump 10 is communicated with the liquid inlet of a catalytic oxidation tower 3, and the liquid inlet of the catalytic oxidation tower 3 is arranged in the middle of the side wall of the catalytic oxidation tower 3; the water outlet of the water inlet pump 2 is communicated with a first water inlet of the catalytic oxidation tower 3, and the first water inlet is arranged at the bottom of the catalytic oxidation tower 3; a small cover body 3-1 is arranged at the top of the catalytic oxidation tower 3; the upper part of the side wall of the catalytic oxidation tower 3 is provided with a nanometer blocking net 6; a stirring device is arranged in the catalyst storage tank 1; the catalyst in the catalyst storage tank 1 is a mixed solution of Fe/sludge-based activated carbon and water, the particle size of the Fe/sludge-based activated carbon is 0.05-0.06 mm, and the concentration of the Fe/sludge-based activated carbon in the mixed solution of the Fe/sludge-based activated carbon and water is 1-1.5 g/L;

the gas-water distributor 5 consists of a main gas inlet pipe 5-1, a support plate 5-2, a plurality of branch gas inlet pipes 5-3 and a plurality of gas outlet pipes 5-4; the plurality of branch air inlet pipes 5-3 are fixed on the upper surface of the support plate 5-2; a plurality of water inlet holes 5-5 are uniformly distributed on the supporting disc 5-2; the air outlet of the main air inlet pipe 5-1 is respectively communicated with the air inlets of all the branch air inlet pipes 5-3, and each branch air inlet pipe 5-3 is provided with a plurality of air outlet pipes 5-4 which are vertically upward; the side wall of the support disc 5-2 is fixed at the middle lower part of the inner wall of the catalytic oxidation tower 3, the main air inlet pipe 5-1 and the branch air inlet pipe 5-3 are on the same horizontal plane, and the main air inlet pipe 5-1 penetrates through the side wall of the catalytic oxidation tower 3 and is sealed with the side wall of the catalytic oxidation tower 3; the aperture of the water inlet 5-5 is smaller than the grain diameter of Fe/sludge-based activated carbon in the catalyst storage tank 1;

the air outlet of the ozone generator 4 is communicated with a main air inlet pipe 5-1 of the air and water distributor 5; an air outlet at the top of the catalytic oxidation tower 3 is communicated with an air inlet of the ozone tail gas destructor 7; a water outlet is arranged at the position of the nanometer blocking net 6 on the side wall of the catalytic oxidation tower 3, part of the outlet water of the water outlet is discharged out of the device, the other part of the outlet water is communicated with a water inlet of a circulating pump 9, the water outlet of the circulating pump 9 is communicated with a second water inlet of the catalytic oxidation tower 3, and the second water inlet is arranged at the middle lower part of the side wall of the chemical oxidation tower 3 and below the gas-water distributor 5; the electromagnetic coil 8 is arranged outside the catalytic oxidation tower 3.

The use method of the device for catalytic oxidation of coal chemical wastewater by using the suspension catalyst comprises the following steps: closing a small cover body 3-1 at the top of the catalytic oxidation tower 3, enabling the top of the catalytic oxidation tower 3 to be in a closed state, starting a stirring device in a catalyst storage tank 1 to enable the catalyst to be in a suspension state, starting a catalyst feeding pump 10 to add the catalyst into the catalytic oxidation tower 3, when the concentration of Fe/sludge activated carbon in the catalytic oxidation tower 3 reaches 0.5g/L, simultaneously starting an ozone generator 4 and a water inlet pump 2, feeding coal chemical industry wastewater 12 into a catalytic oxidation tower 3 through a plurality of water inlet holes 5-5 of a gas-water distributor 5, feeding ozone into the catalytic oxidation tower 3 through a plurality of branch air inlet pipes 5-3 and a plurality of air outlet pipes 5-4 of the gas-water distributor 5 in sequence to react with the coal chemical industry wastewater 12, and discharging redundant ozone into the air under the action of an ozone tail gas destructor 7 outside the top of the catalytic oxidation tower 3; after the catalytic oxidation tower 3 is filled with water, starting a circulating pump 9 to participate in circulating reflux to the catalytic oxidation tower 3, controlling the reflux ratio of effluent to be 100 percent, and discharging the rest effluent 11 up to the standard (COD is less than 50 mg/L); after the coal chemical industry wastewater 12 is treated, a catalyst inlet pump 10, a circulating pump 9, an ozone generator 4 and a water inlet pump 2 are closed, a small cover body 3-1 at the top of a catalytic oxidation tower 3 is opened, an electromagnetic coil 8 extends into the water in the catalytic oxidation tower 3, and the electromagnetic coil 8 is opened to adsorb and recover a suspended catalyst Fe/sludge-based activated carbon in the wastewater by utilizing the magnetic effect of the electromagnetic coil.

The invention has the beneficial effects that:

(1) the catalyst effectively utilizes the residual sludge in the waste secondary sedimentation tank in the sewage plant, and realizes the aim of treating waste by waste;

(2) the catalyst in the catalytic oxidation tower 3 is in a suspension state under the combined action of the ozone gas emitted upwards from the gas-water distributor 5 and the density and particle size of the catalyst, so that the collision probability of the ozone and the catalyst is increased, the removal efficiency of pollutants in the coal chemical industry wastewater is greatly improved, and the COD is less than 50 mg/L;

(3) the invention adopts the electromagnetic ring 8 to recover the magnetic ozone catalyst in the catalytic oxidation tower 3, and the process has simple operation and no secondary pollution.

Drawings

FIG. 1 is a schematic diagram of an apparatus for catalytic oxidation of coal chemical wastewater by a suspended catalyst according to a first embodiment;

fig. 2 is a plan view of the air-water distributor 5 in fig. 1.

Detailed Description