Steam stripping oxidation tank suitable for removing organic matters in high-salt organic wastewater

Abstract

The utility model relates to a steam stripping oxidation tank suitable for removing organic matters in high-salt organic wastewater, and belongs to the technical field of environmental protection equipment. A steam stripping oxidation tank body is composed of a cylinder body, an upper sealing head and a lower sealing head, the interior of the upper sealing head is a steam stripping area after demisting and defoaming, the interior of the cylinder body is a steam stripping, adsorption and oxidation reaction area, organic matter removal of high-salinity organic wastewater is achieved in the area, and the interior of the lower sealing head is a temporary storage area of the high-salinity wastewater after organic matter removal. The device disclosed by the utility model is simple in structure, is integrally of a detachable structure, is convenient to inspect and maintain, and realizes high-efficiency removal of organic pollutants in high-salt organic wastewater by an integrated process of oxidation, adsorption and steam stripping technologies.

Description

TECHNICAL FIELD

[0001] The utility model relates to a stripping oxidation tank suitable for organic matter removal in high-salt organic wastewater, and belongs to the technical field of environmental protection equipment. BACKGROUND

[0002] High-salt organic wastewater refers to wastewater containing organic matter and at least 3.5% total dissolved solids. In addition to containing organic pollutants, these wastewaters also contain a large amount of inorganic salts. High-salt organic wastewater mainly comes from the production processes of petrochemical industry, food industry, pharmaceutical industry, etc. Due to the characteristics of high organic matter and high salt content, the treatment of such wastewater is difficult.

[0003] Due to the characteristics of high salt and high organic matter, if the salt content in the wastewater is to be recycled as a resource, the organic matter in the wastewater must be removed first. The commonly used methods for removing organic matter in wastewater can be divided into advanced oxidation method, biochemical method, adsorption method, etc. Since the high salt content of high-salt organic wastewater inhibits the growth of microorganisms, biochemical method cannot be used; due to the complexity of high-salt organic wastewater, adsorption method cannot guarantee the removal efficiency of organic matter in the effluent, and at present, the process mainly used for removing organic matter in high-salt organic wastewater is still the advanced oxidation method.

[0004] Advanced oxidation technology mainly includes Fenton oxidation method, electro-catalytic oxidation method and wet oxidation method. Fenton oxidation method cannot be applied to the removal of organic matter in high-salt organic wastewater because a large amount of iron-containing sludge is generated during the treatment process, which prevents the resource recycling of salt content in high-salt organic wastewater; electro-catalytic oxidation method is suitable for removing organic matter in high-salt organic wastewater, but its electrode material is expensive, which greatly limits its use; traditional wet oxidation method requires high temperature and high pressure conditions, and its residence time requirement is long, which requires strict requirements for temperature resistance, pressure resistance and corrosion resistance under high temperature and high pressure conditions, resulting in large equipment investment and limiting its use.

[0005] With the complication of high-salt high-organic matter wastewater composition and the severity of sewage treatment situation, a single treatment technology cannot meet the requirements for removing organic matter in high-salt organic wastewater, and the optimization and integration of multiple advanced treatment technologies and equipment will become the development trend of high-salt organic wastewater treatment. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a stripping oxidation tank suitable for removing organic matter in high-salt organic wastewater, which has the functions of stripping, adsorption and oxidation.

[0007] The purpose of the utility model can be achieved by the following technical solutions:

[0008] The utility model discloses a stripping oxidation tank suitable for the removal of organic matters in high-salt organic wastewater, which comprises a cylinder, an upper head and a lower head.

[0009] In the technical scheme of the utility model, the demisting and demisting device is fixed in the cylinder through a demisting and demisting device support ring, and the demisting and demisting device support ring is welded to the inner wall of the cylinder.

[0010] In the technical scheme of the utility model, the wastewater inlet pipe is fixedly connected to the cylinder, and the wastewater inlet pipe is connected to the wastewater distribution pipe.

[0011] In the technical scheme of the utility model, the upper sieve plate is fixedly connected to an upper sieve plate support ring, and the upper sieve plate support ring is fixedly connected to the inner wall of the cylinder 1.

[0012] In the technical scheme of the utility model, the steam inlet pipe is fixedly connected to the cylinder, and the steam inlet pipe is connected to the steam distribution pipe.

[0013] In the technical scheme of the utility model, the oxidant inlet pipe is connected to the steam inlet pipe and located outside the wall of the stripping oxidation tank.

[0014] In the technical scheme of the utility model, the upper head is provided with a stripping steam outlet pipe.

[0015] In the technical scheme of the utility model, the lower head is provided with a treated wastewater outlet pipe.

[0016] In some specific technical schemes, the technical scheme of the utility model comprises the following contents:

[0017] The utility model discloses a stripping oxidation tank suitable for the removal of organic matters in high-salt organic wastewater, which comprises a cylinder, an upper head and a lower head.

[0018] The cylinder is provided with the following functional components from top to bottom: a demisting and demisting device, a demisting and demisting device support ring, a wastewater inlet pipe and a wastewater distribution pipe, an upper sieve plate, an upper sieve plate support ring, adsorption filler, a steam inlet pipe and a steam distribution pipe, a lower sieve plate and a lower sieve plate support ring, so as to realize the adsorption, oxidation degradation and stripping removal of organic matters in high-salt organic wastewater.

[0019] The stripping oxidation tank cylinder is connected with the upper head and the lower head by flanges, the demister is connected with the demister support ring by bolts, the wastewater inlet pipe is connected with the wastewater distribution pipe by flanges, the upper sieve plate is connected with the upper sieve plate support ring by bolts, the steam inlet pipe is connected with the steam distribution pipe by flanges, and the lower sieve plate is connected with the lower sieve plate support ring by bolts, so that the whole is realized as a detachable structure, and is convenient for inspection and maintenance.

[0020] The demister is arranged in the cylinder for removing mist entrained by the stripping steam.

[0021] The upper sieve plate and the lower sieve plate are both composed of support grids and perforated sieve plates, the adsorption filler is fixed between the upper sieve plate and the lower sieve plate, the perforated sieve plates of the upper sieve plate and the lower sieve plate are both arranged on the side of the adsorption filler, the support grids ensure the overall rigidity, and the perforated sieve plates are used for ensuring the perforated hole diameter and the perforated rate, the perforated hole diameter is smaller than the size of the adsorption filler, and is preferably 1 / 2 of the size of the adsorption filler.

[0022] The steam distribution pipe is fixed above the lower sieve plate by a fixing piece and is buried in the adsorption filler, and the oxidant inlet pipe is connected to the steam inlet pipe and is close to the outside of the wall of the stripping oxidation tank, so that the oxidant and the steam are mixed.

[0023] The lower head is provided with a treated wastewater outlet pipe for discharging high-salt wastewater after removal of organic matter, the pipe is extended into the inside of the lower head by 50-100 mm, and a filter cap is arranged on the upper part of the extended pipe to prevent impurities from entering the subsequent treatment facilities through the treated wastewater outlet pipe.

[0024] The stripping oxidation tank is made of steel lined with ceramic or corrosion-resistant metal, the inner member is made of corrosion-resistant metal or silicon carbide, and the adsorption filler is a porous medium, which can be zeolite or activated carbon or the like.

[0025] The lower head is connected with the cylinder by flanges, the lower head is provided with a treated wastewater outlet pipe for discharging high-salt wastewater after removal of organic matter, the pipe is extended into the inside of the lower head, and a filter cap is arranged on the upper part of the extended pipe to prevent impurities from entering the subsequent treatment facilities through the treated wastewater outlet pipe.

[0026] The stripping oxidation tank can be supported by ears or legs, if the ears are used, the ears are fixed to the cylinder section, and if the legs are used, the legs are fixed to the lower head.

[0027] High-salt organic wastewater is homogenized, filtered and heated, and then distributed on the upper liquid surface of the stripping oxidation tank through the wastewater distribution pipe, and the oxidant and steam are distributed on the lower liquid surface of the stripping oxidation tank through the steam distribution pipe, the oxidant steam rises along the packing surface gap to the upper liquid surface, and the high-salt organic wastewater runs along the packing surface gap to the tank bottom, and meets the countercurrent flow on the surface gap of the adsorption packing, in this process, the adsorption packing adsorbs the organic matter in the high-salt wastewater, and the oxidant oxidizes and degrades the macromolecular organic matter adsorbed in the adsorption packing and the high-salt organic wastewater into inorganic matter and small-molecular organic matter, and the small-molecular organic matter is stripped into the steam phase in the stripping oxidation tank due to the low boiling point, the stripping steam carrying the small-molecular organic matter is transported to the subsequent treatment facility through the stripping steam outlet pipe, and the high-salt wastewater after removing the organic matter is transported to the subsequent treatment facility through the treated wastewater outlet pipe.

[0028] The beneficial effects of the utility model are as follows:

[0029] The utility model discloses simple structure, the whole is detachable structure, and it is convenient for inspection and maintenance, and the equipment realizes the efficient removal of organic pollutants in high-salt organic wastewater through the integration of oxidation, adsorption and stripping technology.

[0030] In the stripping oxidation tank, high-concentration organic matter reacts with low-concentration oxidant in the upper part of the adsorption packing layer, realizing efficient utilization of the oxidant, and low-concentration organic matter reacts with high-concentration oxidant in the lower part of the adsorption packing layer, realizing efficient removal of the organic matter. Meanwhile, under the action of the adsorbent and steam in the stripping oxidation tank, the organic matter in the high-salt organic wastewater is removed more efficiently. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the structure schematic diagram of the utility model.

[0032] In the drawing, 1 is a cylinder, 2 is an upper head, 3 is a lower head, 4 is a stripping steam outlet pipe, 5 is a wastewater inlet pipe, 6 is a steam inlet pipe, 7 is a treated wastewater outlet pipe, 8 is a demister, 9 is an upper sieve plate, 10 is a wastewater distribution pipe, 11 is adsorption packing, 12 is a steam distribution pipe, 13 is a lower sieve plate, 14 is a demister support ring, 15 is an upper sieve plate support ring, 16 is a lower sieve plate support ring, and 17 is an oxidant inlet pipe. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solutions, the utility model will be described in detail below with specific implementation methods, but the protection scope of the utility model is not limited to this:

[0034] For example, Figure 1As shown, a stripping oxidation tank suitable for removing organic matter in high-salt organic wastewater, the stripping oxidation tank tank body is composed of a cylinder 1, an upper head 2 and a lower head 3, the inside of the upper head is a stripping steam area after demisting and defoaming, the inside of the cylinder is a stripping, adsorption and oxidation reaction area, in which the removal of organic matter in high-salt organic wastewater is realized, and the inside of the lower head is a high-salt wastewater storage area after the removal of organic matter.

[0035] The inside of the cylinder 1 is provided with a demisting and defoaming device 8, a demisting and defoaming device support ring 14, a wastewater inlet pipe 5 and a wastewater distribution pipe 9, an upper sieve plate 10, an upper sieve plate support ring 15, an adsorption filler 11, a steam inlet pipe 6 and a steam distribution pipe 12, a lower sieve plate 13 and a lower sieve plate support ring 16 from top to bottom.

[0036] The demisting and defoaming device 8 is placed on the upper part of the demisting and defoaming device support ring 14 and is fixed by bolt connection on the upper part of the support ring, and the demisting and defoaming device support ring 14 is welded and fixed on the inner wall of the cylinder 1.

[0037] The wastewater inlet pipe 5 is composed of a connecting short pipe, an external flange and an internal flange which are welded together, the connecting short pipe is fixed to the cylinder 1 by full welding on the inside and outside, the external flange is used to connect the external wastewater inlet pipe, and the internal flange is used to connect the wastewater distribution pipe 9.

[0038] The upper sieve plate 10 is placed on the upper part of the upper sieve plate support ring 15 and is fixed by bolt connection on the upper part of the support ring, and the upper sieve plate support ring 15 is welded and fixed on the inner wall of the cylinder 1. The upper sieve plate 10 is composed of a support grid and an open sieve plate, so as to ensure the overall rigidity and the number of open holes.

[0039] The steam inlet pipe 6 is composed of a connecting short pipe, an external flange and an internal flange which are welded together, the connecting short pipe is fixed to the cylinder 1 by full welding on the inside and outside, the external flange is used to connect the external steam inlet pipe, and the internal flange is used to connect the steam distribution pipe 12.

[0040] The oxidant inlet pipe 17 is connected to the connecting short pipe of the steam inlet pipe 6 and is close to the outside of the stripping oxidation tank wall, so as to realize the mixing of the oxidant and the steam.

[0041] The lower sieve plate 13 is placed on the upper part of the lower sieve plate support ring 16 and is fixed by bolt connection on the upper part of the support ring, and the lower sieve plate support ring 16 is welded and fixed on the inner wall of the cylinder 1. The lower sieve plate 13 is composed of a support grid and an open sieve plate, so as to ensure the overall rigidity and the number of open holes.

[0042] The upper head 2 is preferably in the form of a disc-shaped pressure-bearing head, the upper head is connected with the flange of the cylinder 1 through the flange surface, and the upper head is provided with a stripping steam outlet pipe 4 on the top.

[0043] The lower head 3 is preferably in the form of a dished pressure head, and is connected to the flange of the cylinder 1 through a flange surface. A treated wastewater outlet pipe 7 is arranged at the bottom of the head, and is used for discharging high-salt wastewater after removal of organic matter. The pipe extends into the inside of the lower head 3 by 50-100 mm, and a filter cap is arranged at the upper portion of the pipe to prevent impurities from entering the subsequent treatment facilities through the treated wastewater outlet pipe 7.

[0044] The working principle of the utility model is as follows:

[0045] After being homogenized, filtered and heated, the high-salt organic wastewater with a salt content of greater than 3.5% is uniformly distributed in the upper liquid surface of the stripping oxidation tank through the wastewater distribution pipe 9. Due to the continuous discharge of the treated wastewater, the high-salt organic wastewater entering the stripping oxidation tank passes through the liquid holding section of the adsorption filler 11 from top to bottom. The oxidizing agent and the heating steam are uniformly distributed in the lower liquid surface of the stripping oxidation tank through the steam distribution pipe 12, and due to the difference in steam and liquid density, the steam carrying the oxidizing agent passes through the liquid holding section of the adsorption filler 11 from bottom to top. The oxidizing agent steam rises along the gap between the filler surfaces to the upper liquid surface, and the high-salt organic wastewater runs along the gap between the filler surfaces to the tank bottom, and the countercurrent meets at the gap between the filler surfaces of the adsorption filler 11. In this process, the adsorption filler adsorbs the organic matter in the high-salt wastewater, and the oxidizing agent oxidizes and degrades the macromolecular organic matter adsorbed in the adsorption filler 11 and the high-salt organic wastewater into inorganic matter and small-molecular organic matter. Due to the lower boiling point, the small-molecular organic matter is stripped into the steam phase in the stripping oxidation tank, and the stripping steam carrying the small-molecular organic matter is transported to the subsequent treatment facilities through the stripping steam outlet pipe 4. The high-salt wastewater after removal of the organic matter is transported to the subsequent treatment facilities through the treated wastewater outlet pipe 7.

[0046] Preferably, the operating temperature of the stripping oxidation tank is 100-150°C, and the operating pressure is 0.1-0.5 MPa. The specific operating temperature and pressure are determined according to the oxidation and degradation difficulty and content of the organic matter in the wastewater.

[0047] Preferably, the oxidizing agent inlet pipe 17 is connected to the steam inlet pipe 6, and a mixing device is arranged in the pipe to better mix the oxidizing agent and the steam.

[0048] Preferably, the adsorption filler in the stripping oxidation tank is a porous medium with the performance of adsorbing organic matter, which can be zeolite or activated carbon or the like or a mixture thereof, and the adsorption filler is preferably used as a carrier material of the catalytic oxidation active substance, so as to further enhance the oxidation performance of the oxidizing agent and ensure the oxidation and degradation rate of the organic matter.

[0049] Embodiment:

[0050] The high-salt wastewater containing aniline in a certain petrochemical enterprise is treated. The wastewater flow is 6 t / h, the salt content in the wastewater is 10%-12.5%, and the organic matter in the wastewater is CODcr characterization, COD cr The content of the high-salinity wastewater is 2000 mg / L to 3000 mg / L, and the pH value is 6 to 7. The stripping oxidation tank is made of carbon steel with a titanium explosion composite plate, the diameter of the tank body is 1.5 m, the height of the tank body is 3.5 m, the height of the cylinder is 2.5 m, the aperture of the upper and lower screens is 5 mm, the screen aperture rate is 30%, the distance between the screens is 1.2 m, the adsorption filler is porous zeolite, the stripping steam is 0.2 MPa, 120°C saturated steam, the oxidant is oxygen, and the operating pressure of the stripping oxidation tank is 0.16 MPa. After the stripping oxidation tank is put into operation, the data during the operation process is monitored, the stripping steam consumption is 200 kg / h, the oxygen consumption is 20 kg / h, the organic content of the treated high-salinity wastewater is less than 200 mg / L, and the organic removal rate is more than 90%.

Claims

1. A stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater, characterized by, The stripping oxidation tank comprises a cylinder (1), an upper head (2) and a lower head (3), the cylinder (1) is sequentially provided with a demister (8), an upper sieve plate (10), a wastewater distribution pipe (9), an adsorption filler (11), a steam distribution pipe (12) and a lower sieve plate (13) from top to bottom.

2. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, The demister (8) is fixed in the cylinder (1) through a demister support ring (14), and the demister support ring (14) is welded to the inner wall of the cylinder (1).

3. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, A wastewater inlet pipe (5) is fixedly connected with the cylinder (1), and the wastewater inlet pipe (5) is connected with the wastewater distribution pipe (9).

4. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, The upper sieve plate (10) is fixedly connected with an upper sieve plate support ring (15), and the upper sieve plate support ring (15) is fixedly connected with the inner wall of the cylinder (1).

5. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, A steam inlet pipe (6) is fixedly connected with the cylinder (1), and the steam inlet pipe (6) is connected with the steam distribution pipe (12).

6. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, An oxidant inlet pipe (17) is connected with the steam inlet pipe (6) and located outside the wall of the stripping oxidation tank.

7. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, The upper head (2) is provided with a stripping steam outlet pipe (4).

8. The stripping oxidation tank suitable for removal of organic matter in high-salinity organic wastewater according to claim 1, characterized in that, The lower head (3) is provided with a treated wastewater discharge outlet pipe (7).

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