CN203568942U - A device for treating acid-containing heavy crude oil refinery salt water - Google Patents

Abstract

The utility model discloses a device for treating acid-containing heavy crude oil refinery and saline sewage. Flotation equipment (3), secondary air flotation equipment (4), biological aeration device (5), anaerobic hydrolysis acidification device (6), primary denitrification device, secondary denitrification device and ozone catalytic oxidation device (13 ). Utilize the equipment described in the utility model to treat the salty sewage produced in the refining process of high-acid heavy crude oil, and the treated water body can meet the requirements of CODcr≤60mg/L, petroleum ≤5mg/L, and ammonia nitrogen≤10mg/L , Total nitrogen ≤ 40mg/L requirements.

Description

A device for treating acid-containing heavy crude oil refinery salt water

technical field

The utility model belongs to the technical field of oil refinery sewage treatment, in particular to a device for treating acid-containing heavy crude oil refinery salt-containing sewage.

Background technique

Acid-containing heavy crude oil generally refers to crude oil with an acid value greater than 2.0 mgKOH/g and a relative density greater than 0.931 g/cm ³ . In addition to the common characteristics of heavy oil such as low API°, high specific gravity, high carbon residue, and high colloidal asphaltene content, acid-containing heavy crude oil generally also has the characteristics of high sulfur nitrogen, high salt content, and high acid value. Due to the decreasing global conventional oil reserves, the proportion of high-acid heavy crude oil in domestic imported crude oil is getting higher and higher. Most of the domestic newly-built refining and chemical enterprises use heavy crude oil with high acid content as the main raw material for processing design.

Acidic heavy crude oil processing units can be divided into primary processing units and secondary processing units, and all point source sewage discharged is divided into oily sewage series and saline sewage series according to the characteristics of pollutants. The oily sewage mainly comes from the secondary processing device, and the pollution degree is relatively light. After physicochemical-biochemical-advanced treatment, pure water can be produced for reuse in boilers. However, due to the high salt content, the saline sewage is not suitable for the production of pure water by reverse osmosis membrane technology, and is generally discharged after being treated up to the standard. Acidic heavy crude oil refinery saline wastewater is mainly produced from the dehydration of crude oil tanks and the desalination and dehydration process of primary processing units. Saline sewage has the pollution characteristics of high COD (>4000mg/L), high oil content (>1000mg/L), high ammonia nitrogen (>200mg/L), and high conductivity (>4000μs/cm) macroscopically. It has the pollution characteristics of high content of polar pollutants such as organic acids, esters, alcohols, and heterocyclic compounds. Therefore, saline sewage exhibits strong emulsification properties and weak biodegradation properties. As many provinces began to implement the first-level discharge standard requirements (CODcr≤60mg/L, petroleum ≤5mg/L, Ammonia nitrogen ≤ 10mg/L, total nitrogen ≤ 40mg/L), more stringent treatment requirements for salty sewage are put forward.

ZL200910081479.5 discloses a method for advanced treatment of super-heavy oily sewage, and discloses the corresponding device for realizing the method. - Primary hydrolytic acidification tank - circulating activated sludge method (CAST) tank - secondary hydrolysis acidification tank - biological aerated filter - coagulation tank - Lamera inclined plate sedimentation tank" device for all the processing of super heavy oil Point source salty sewage and oily sewage are treated in a centralized manner, and the effluent indicators meet the requirements of petroleum ≤ 10mg/L, CODcr ≤ 100mg/L, and ammonia nitrogen ≤ 15mg/L. Super-heavy oil is also a kind of heavy crude oil with high acid content. Although the above-mentioned patents use the corresponding equipment to treat the salty sewage of heavy crude oil with high acid content to a certain extent, there are still defects that the sewage water is difficult to meet the standard, and the effluent index is still Not enough to fully meet the first-level discharge standards (CODcr≤60mg/L, petroleum ≤5mg/L, ammonia nitrogen ≤10mg) in the local standard of Guangdong Province "Water Pollution Discharge Limits" (DB44/26-2001) (second period) /L, total nitrogen ≤40mg/L).

Utility model content

The purpose of this utility model is to overcome the above-mentioned defects of the prior art, reduce the CODcr value, petroleum content, ammonia nitrogen content and total nitrogen content of the water body after treatment, and provide a water body after treatment that can meet CODcr≤60mg/L, petroleum ≤5mg/L, ammonia nitrogen ≤10mg/L, and total nitrogen ≤40mg/L are required for the treatment of acid-containing heavy crude oil refining and saline wastewater.

In order to achieve the above purpose, the utility model provides a kind of equipment for treating salty wastewater from the refinery of acid-containing heavy crude oil, the equipment includes a gravity sedimentation degreasing device connected in sequence, an inclined plate sedimentation degreasing device, a first-stage air flotation Equipment, secondary air flotation equipment, biological aeration device, anaerobic hydrolysis acidification device, primary denitrification device, secondary denitrification device and ozone catalytic oxidation device.

Preferably, the gravity sedimentation oil removal device, inclined plate sedimentation oil removal device, primary air flotation equipment, secondary air flotation equipment, biological aeration device, anaerobic hydrolysis acidification device, primary denitrification device, secondary denitrification device The nitrogen device and the ozone catalytic oxidation device are sequentially connected through the sewage pipeline.

Preferably, the gravity sedimentation oil removal device is a homogeneous adjustment tank.

Preferably, the inclined plate sedimentation deoiler is an inclined plate degreaser.

Preferably, the primary air flotation device is a primary vortex concave air flotation device.

Preferably, the secondary air flotation device is a secondary dissolved air flotation device.

Preferably, the biological aeration device is an internal circulation biological aerated filter.

Preferably, the anaerobic hydrolysis acidification device is an anaerobic hydrolysis acidification tank.

Preferably, the primary denitrification device includes a primary A tank, a primary O tank, and an intermediate sedimentation tank connected in sequence.

Preferably, the secondary denitrification device includes a secondary A pool, a secondary O pool and an MBR pool connected in sequence.

Preferably, the ozone catalytic oxidation device is an ozone catalytic oxidation tower.

Utilizing the equipment for treating acid-containing heavy crude oil refinery saline sewage of the utility model to process the high organic load refractory saline sewage produced in the refining process of high-acid heavy crude oil can significantly reduce the waste water after treatment. CODcr value, petroleum content, ammonia nitrogen content and total nitrogen content, the treated water can meet the requirements of CODcr ≤ 60mg/L, petroleum ≤ 5mg/L, ammonia nitrogen ≤ 10mg/L, and total nitrogen ≤ 40mg/L. It solves the problem of wastewater compliance caused by the processing of heavy crude oil with high acid content in refineries.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

Fig. 1 is a schematic structural view of the equipment for treating acid-containing heavy crude oil refinery and saline sewage in a preferred embodiment of the present invention.

Explanation of reference signs

1. Gravity sedimentation oil removal device; 2. Inclined plate sedimentation oil removal device; 3. First-level air flotation equipment; 4. Second-level air flotation equipment; 5. Biological aeration device; 6. Anaerobic hydrolysis acidification device; Level O pool; 9 medium sedimentation pool; 10 secondary A pool; 11 secondary O pool; 12 MBR pool; 13 ozone catalytic oxidation device.

Detailed ways

The specific embodiment of the utility model will be described in detail below in conjunction with FIG. 1 . It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

As shown in Fig. 1, the utility model provides a kind of equipment for treating salty wastewater from refinery of acid-containing heavy crude oil. Air flotation equipment 3, secondary air flotation equipment 4, biological aeration device 5, anaerobic hydrolysis acidification device 6, primary denitrification device, secondary denitrification device and ozone catalytic oxidation device 13.

In the utility model, the gravity sedimentation degreasing device 1 can be various devices commonly used in the field capable of separating floating oil, large particle suspended solids (SS) and water bodies in the refining of acid-containing heavy crude oil and saline sewage, in order to More effectively remove non-dissolved pollutants such as petroleum and suspended solids (SS) in saline sewage. In a preferred case, the gravity sedimentation degreasing device 1 is a homogeneous adjustment tank.

It should be understood by those skilled in the art that after the salty sewage is treated by the gravity sedimentation oil removal device 1, the floating oil and large particle SS in the salty sewage are separated from the water body, and the floating oil floating to the top of the gravity sedimentation oil removal device 1 can be recovered. Oil, remove the large particle SS that settles to the bottom of the gravity sedimentation oil removal device 1, and input the water body into the next treatment device.

In the utility model, the slant plate sedimentation degreasing device 2 can be various devices commonly used in the art that can separate SS, oil droplets and water bodies in the saline sewage, in order to more effectively remove petroleum, oil, and water in the saline sewage For non-dissolved pollutants such as SS, in a preferred situation, the sloping plate precipitation degreasing device 2 is a sloping plate degreaser.

It should be understood by those skilled in the art that in the inclined plate sedimentation oil removal device 2, the dispersed oil in the water body can be coalesced to form larger oil droplets by using the inclined plate coalescence effect and the shallow pool sedimentation theory, and the small particles SS Coalesce to form larger particles of SS, separate the large particles of SS and oil droplets from the water body, recover the oil droplets that float up to the top of the inclined plate sedimentation degreasing device 2, remove the SS that settles to the bottom of the inclined plate sedimentation deoiling device 2, and separate the water body into the next processing unit.

Those skilled in the art should understand that, in the present utility model, slick oil refers to oil droplets floating on the surface of a water body with a particle size greater than 80 μm; dispersed oil refers to tiny oil droplets with a particle size of less than 10 μm, dispersed in water in a suspended state , unstable; emulsified oil means that due to the presence of surfactants, the oil is an emulsion in water, and it is easy to form O/W emulsified particles with a particle size of less than 1 μm. It is relatively stable in water and is not easy to float on the water surface.

In the utility model, the primary air flotation device 3 can be various air flotation devices commonly used in the field capable of removing emulsified oil and suspended solids in the water body, in order to more effectively remove non-dissolved pollution such as petroleum and SS in the water Preferably, the primary air flotation device 3 is a primary vortex concave air flotation device.

Those skilled in the art should understand that after the water body is treated by the primary air flotation device 3, the demulsified (colloidal) suspended matter and emulsified oil in the water body can be taken to the top of the primary air flotation device 3 for separation.

In the utility model, the secondary air flotation device 4 can be various air flotation devices commonly used in the field that can further remove emulsified oil and suspended matter in the water body. For pollutants, preferably, the secondary air flotation device 4 is a secondary dissolved air flotation device.

Those skilled in the art should understand that after the water body is treated by the secondary air flotation device 4, the emulsified oil and SS and other insoluble pollutants can float to the top of the secondary air flotation device 4 for deep separation.

In the utility model, "gravity sedimentation degreasing device 1-slope plate sedimentation degreasing device 2-first-stage air flotation equipment 3-secondary air flotation equipment 4" is a physical and chemical treatment unit. After the above physical and chemical treatment, acid-containing heavy The non-dissolved pollutants such as petroleum and SS in the salty sewage of crude oil refining are removed more thoroughly, and the corresponding organic pollution load is also reduced, which improves the water quality guarantee for the operation of the biochemical system.

In the present utility model, the biological aeration device 5 can be a variety of biological aeration devices commonly used in the field that can deeply degrade the biochemical oxygen demand (BOD) and greatly reduce the load of organic pollution. Preferably, the biological aeration device 5 Biological aerated filter for internal circulation. The water body treated by the secondary air flotation equipment 4 undergoes biochemical pretreatment in the internal circulation biological aerated filter. The internal circulation biological aerated filter preferably adopts a large circulation ratio and excessive aeration to strengthen the pollutant-oxygen- The mass transfer between microorganisms has the characteristics of a completely mixed reactor, which can withstand high organic pollution loads; at the same time, the tank is equipped with filter materials, and high-density microbial films can be formed on the surface of the filter materials, and sludge filter materials will form in the gaps between the filter materials. layer, making BOD degradation and suspended matter adsorption and filtration stronger.

In the utility model, the anaerobic hydrolysis and acidification device 6 can be various devices commonly used in the art that can convert the macromolecular refractory organic pollutants in the water body into small molecular easily degradable organic pollutants through anaerobic hydrolysis and acidification. The macromolecular refractory organic pollutants in the water body are better converted into small molecular easily degradable organic pollutants, further improving the biodegradability of the water body. Preferably, the anaerobic hydrolysis acidification device 6 is an anaerobic hydrolysis acidification tank.

It should be understood by those skilled in the art that the organic pollution load of the water body after the treatment of the biological aeration device 5 is reduced, and the biodegradation performance will also be greatly reduced; but after the treatment by the anaerobic hydrolysis acidification device 6, the biological Degradation performance was restored. That is to say, the water body treated by the biochemical pretreatment unit of "biological aeration device 5-anaerobic hydrolysis acidification device 6" can simultaneously achieve the water quality control goals of reducing organic pollution load and improving biodegradation performance.

In the present utility model, the first-stage denitrification device 7 can be a denitrification device commonly used in the field that can reduce chemical oxygen demand (COD) and greatly remove inorganic pollutants such as ammonia nitrogen and total nitrogen. In order to control COD more effectively , ammonia nitrogen, and total nitrogen indicators, preferably, the first-level denitrification device includes a first-level anoxic pool (first-level A pool) 7, a first-level aerobic pool (first-level O pool) 8, and a middle sedimentation pool 9 , that is to say, the primary denitrification device is preferably a primary A/O/settling tank.

Those skilled in the art should understand that in the primary A pool 7, the nitrate nitrogen in the primary O pool 8 reflux nitrification liquid is denitrified, COD in the influent is partially removed by denitrifying bacteria, and hydrolysis occurs at the same time Acidification improves biodegradability; in the primary O pool 8, ammonia nitrogen is nitrified into nitrate nitrogen, and COD is aerobically biochemically degraded.

In the utility model, the secondary denitrification device can be a conventional denitrification device in the field capable of deeply removing pollutants such as COD, ammonia nitrogen, and total nitrogen. In order to more effectively control COD, ammonia nitrogen, and total nitrogen indicators, preferably, The secondary denitrification device includes a secondary anoxic pool (secondary A pool) 10, a secondary aerobic pool (secondary O pool) 11, and a membrane bioreactor (MBR pool) 12 connected in sequence, that is, two The first-stage denitrification device is preferably a second-stage A/O/MBR pool.

Those skilled in the art should understand that in the secondary A pool 10, the nitrate nitrogen is denitrified to reduce the total nitrogen content and reduce the COD simultaneously; in the secondary O pool 11, the ammonia nitrogen is nitrified to generate nitrate nitrogen, and the COD is reduced Aerobic biochemical degradation; in the MBR pool 12, the hydraulic retention time of refractory organic pollutants is long enough, which is also conducive to the interception, growth and reproduction of autotrophic nitrifying bacteria, ammonia nitrogen continues to be nitrified in the MBR pool 12 to generate nitrate nitrogen, and COD is Continuous degradation.

Those skilled in the art should understand that the water body treated by the main biochemical unit of the "primary denitrification device-secondary denitrification device" can deeply remove pollutants such as COD, ammonia nitrogen, and total nitrogen.

In the utility model, in order to further degrade and mineralize the COD and refractory organic pollutants in the water body, preferably, the ozone catalytic oxidation device 13 is an ozone catalytic oxidation tower. In the ozone catalytic oxidation tower, the water body is treated under the synergistic effect of ozone/heterogeneous catalyst.

The ozone catalytic oxidation device 13 is a guarantee treatment unit, and the water body treated by the ozone catalytic oxidation device 13 can meet the requirements of CODcr≤60mg/L, petroleum ≤5mg/L, ammonia nitrogen≤10mg/L, and total nitrogen≤40mg/L .

In the utility model, for the gravity sedimentation oil removal device (1), the inclined plate sedimentation oil removal device (2), the primary air flotation equipment (3), the secondary air flotation equipment (4), and the biological aeration device (5) , the anaerobic hydrolysis acidification device (6), the primary denitrification device, the secondary denitrification device and the ozone catalytic oxidation device (13) have no special requirements for the connection mode, as long as the water body treated by the previous device can be input In the next device, for example, gravity sedimentation oil removal device (1), inclined plate sedimentation oil removal device (2), primary air flotation equipment (3), secondary air flotation equipment (4), biological aeration device (5), the anaerobic hydrolysis acidification device (6), the primary denitrification device, the secondary denitrification device and the ozone catalytic oxidation device (13) can be sequentially connected through sewage pipes.

Preferably, homogeneous adjustment tank, inclined plate degreaser, primary vortex air flotation equipment, secondary dissolved air flotation equipment, internal circulation biological aerated filter, anaerobic hydrolysis acidification tank, primary A pool 7 , the primary O pool 8, the intermediate sedimentation pool 9, the secondary A pool 10, the secondary O pool 11, the MBR pool 12 and the ozone catalytic oxidation tower are sequentially connected through sewage pipes.

In a preferred embodiment, as shown in Figure 1, the equipment for treating acid-containing heavy crude oil refinery saline sewage of the present invention includes a gravity sedimentation deoiling device 1 and an inclined plate sedimentation deoiling device 2 connected in sequence , primary air flotation equipment 3, secondary air flotation equipment 4, biological aeration device 5, anaerobic hydrolysis acidification device 6, primary denitrification device, secondary denitrification device and ozone catalytic oxidation device 13, wherein the gravity settling The oil removal device 1 is a homogeneous adjustment tank, the inclined plate sedimentation oil removal device 2 is an inclined plate oil remover, the first-level air flotation device 3 is a first-level vortex air flotation device, and the second-level air flotation device 4 is a second-level dissolved air Air flotation equipment, the biological aeration device 5 is an internal circulation aerated biological filter, the anaerobic hydrolysis acidification device 6 is an anaerobic hydrolysis acidification tank, and the primary denitrification device includes a primary A pool 7, a primary O pool 8 and a middle Settling tank 9, secondary denitrification device includes secondary A pool 10, secondary O pool 11 and MBR pool 12, ozone catalytic oxidation device 13 is an ozone catalytic oxidation tower; homogeneous adjustment tank, inclined plate degreaser, primary Vortex concave air flotation equipment, secondary dissolved air flotation equipment, internal circulation biological aerated filter, anaerobic hydrolysis acidification tank, primary A pool 7, primary O pool 8, intermediate sedimentation pool 9, secondary A pool 10 , the secondary O pool 11, the MBR pool 12 and the ozone catalytic oxidation tower are sequentially connected through sewage pipes.

Specifically, the acid-containing heavy crude oil refining saline sewage is input into the homogeneous adjustment tank for treatment, the oil slick and large particle SS in the saline sewage are separated from the water body, and the oil slick that floats up to the top of the homogeneous adjustment tank is recovered. Remove the large particles of SS that have settled to the bottom of the homogeneous adjustment tank, and input the water treated by the homogeneous adjustment tank into the inclined plate degreaser for treatment; in the inclined plate degreaser, the recovery floats to the inclined plate degreaser The oil droplets on the top remove the SS that has settled to the bottom of the inclined plate degreaser, and the water treated by the inclined plate degreaser is mixed with coagulant and coagulant and then input into the first-stage vortex concave air flotation equipment for treatment ; In the first-level vortex air flotation equipment, the suspended matter and emulsified oil on the top of the first-level vortex air flotation equipment are removed, and the water treated by the first-level vortex air flotation equipment is mixed with coagulant and coagulant After mixing, enter the secondary dissolved air flotation equipment for treatment; in the secondary dissolved air flotation equipment, the emulsified oil and suspended solids on the top of the secondary dissolved air flotation equipment are removed, and will be processed by the secondary dissolved air flotation equipment The final water body is input into the internal circulation biological aerated filter for treatment; the water body is treated in the internal circulation biological aerated filter (the filter material is installed in the pool, and a high-density microbial film is formed on the surface of the filter material, and a sludge filter layer is formed between the gaps of the filter material ) for biochemical pretreatment, the internal circulation biological aerated filter adopts a large circulation ratio and excessive aeration, deeply degrades BOD and absorbs and filters suspended solids, and the water treated by the internal circulation biological aerated filter is input into anaerobic hydrolysis acidification treatment in the tank; the anaerobic hydrolysis acidification tank converts the macromolecular refractory organic pollutants in the water body into small molecular easily degradable organic pollutants, and improves the biodegradability of the water body, and the water body treated by the anaerobic hydrolysis acidification tank is input The treatment is carried out in the first-level A/O/intermediate sedimentation tank (the first-level A pool 7, the first-level O pool 8, and the intermediate sedimentation tank 9 connected in sequence); the water body treated by the first-level A/O/intermediate sedimentation tank can be Reduce COD, and at the same time greatly remove inorganic pollutants such as ammonia nitrogen and total nitrogen, and input the water treated by the first-level A/O/ middle sedimentation tank into the second-level A/O/MBR pool (the second-level A pool connected in sequence 10, Secondary O pool 11 and MBR pool 12) for treatment; the water body treated by the secondary A/O/MBR pool can deeply remove pollutants such as COD, ammonia nitrogen, and total nitrogen, and will pass through the secondary A/O/MBR pool The water body treated in the pool is input into the ozone catalytic oxidation tower for treatment; in the ozone catalytic oxidation tower, the water body is treated under the synergistic action of ozone/multi-phase catalyst, and the treated water body can meet the requirements of CODcr≤60mg/L and petroleum ≤5mg /L, ammonia nitrogen ≤ 10mg/L, total nitrogen ≤ 40mg/L.

The preferred embodiment of the utility model has been described in detail above, but the utility model is not limited to the specific details in the above embodiment, and within the scope of the technical concept of the utility model, various simple modifications can be made to the technical solution of the utility model , these simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be explained separately.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (11)

1. An equipment for treating acid-containing heavy crude oil refinery and saline sewage, characterized in that the equipment includes a gravity sedimentation degreasing device (1), an inclined plate sedimentation degreasing device (2), a first-stage Air flotation equipment (3), secondary air flotation equipment (4), biological aeration device (5), anaerobic hydrolysis acidification device (6), primary denitrification device, secondary denitrification device and ozone catalytic oxidation device ( 13). 2. The equipment according to claim 1, characterized in that, the gravity sedimentation oil removal device (1), inclined plate sedimentation oil removal device (2), primary air flotation equipment (3), and secondary air flotation equipment (4), the biological aeration device (5), the anaerobic hydrolysis acidification device (6), the primary denitrification device, the secondary denitrification device and the ozone catalytic oxidation device (13) are sequentially connected through sewage pipes. 3. The equipment according to claim 1 or 2, characterized in that the gravity sedimentation oil removal device (1) is a homogeneous adjustment tank. 4. The equipment according to claim 1 or 2, characterized in that, the sloping plate sedimentation degreasing device (2) is a sloping plate degreaser. 5. The device according to claim 1 or 2, characterized in that the first-stage air flotation device (3) is a first-stage vortex-concave air flotation device. 6. The equipment according to claim 1 or 2, characterized in that the secondary air flotation equipment (4) is a secondary dissolved air flotation equipment. 7. The equipment according to claim 1 or 2, characterized in that the biological aeration device (5) is an internal circulation biological aerated filter. 8. The equipment according to claim 1 or 2, characterized in that the anaerobic hydrolysis acidification device (6) is an anaerobic hydrolysis acidification tank. 9. The equipment according to claim 1 or 2, characterized in that the primary denitrification device includes a primary A pool (7), a primary O pool (8) and an intermediate sedimentation pool (9) connected in sequence . 10. The equipment according to claim 1 or 2, characterized in that the secondary denitrification device comprises a secondary A pool (10), a secondary O pool (11) and an MBR pool (12) connected in sequence. 11. The equipment according to claim 1 or 2, characterized in that the ozone catalytic oxidation device (13) is an ozone catalytic oxidation tower.

Images