CN201901624U - Ultra-thick oil refining sewage treatment device - Google Patents

Abstract

The utility model discloses an ultra-heavy oil refinery sewage treatment device, which comprises: a hydrolysis acidification reaction device, an aerobic reaction device of an activated sludge method, an aerobic reaction device of a biofilm method, a precipitation reaction device, a quartz sand filter device and an ozone biological Activated carbon reaction device, wherein the hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device, quartz sand filter device and ozone biological activated carbon reaction device are sequentially connected through pipelines. After adopting the ultra-heavy oil refinery sewage treatment device in the utility model, the water quality of the refinery sewage treatment effluent can be fundamentally improved, the latest environmental protection discharge standard can be ensured, good raw water quality conditions can be established for subsequent sewage reuse projects, and the investment in reclaimed water can be reduced. The operating cost has the advantages of convenient operation and low cost.

Description

Ultra-heavy oil refinery sewage treatment plant

technical field

The utility model relates to a kind of sewage treatment equipment; more specifically, it relates to an advanced treatment device for ultra-heavy oil refinery sewage.

Background technique

At present, the effluent water quality index of domestic oil refinery sewage treatment plants generally stays between 60-80mg/L, and some old equipment still stays between 80-120mg/L. (such as Jinxi Petrochemical Company) or with oxidation pond conditions for a residence time of more than 2 months (such as Yanshan Petrochemical, Daqing Petrochemical) can reach a level below 60mg/L. The biochemical section of the "old three sets" process belongs to a typical aerobic biochemical process. Even the design and actual operation of the A section of the A/O process can only meet the working conditions of the anoxic pool. According to the water quality characteristics of the oil refining wastewater and domestic The actual operation results of each typical refinery sewage treatment device show that the COD of the "old three sets" process effluent can only ensure the control standard of 80mg/L or more, compared with the local standard of sewage general discharge implemented in some areas in China (COD≤50mg/L) However, there is still a large achievement gap.

In addition, according to the country's specific requirements for water conservation and emission reduction of major water discharge units, and considering the actual needs of enterprises for water conservation, efficiency enhancement, and active construction of sewage reuse projects, the oil refinery sewage treatment plant as a source of reused water, its The quality of effluent directly determines the process route and investment scale of subsequent sewage reuse. As an important assessment standard for reclaimed water reuse, the COD index is one of the main targets for the design of domestic reclaimed water installations. However, the remaining COD of the oil refinery wastewater that has been fully treated in the previous aerobic biochemical process is refractory or non-biodegradable organic matter. , its water quality is extremely poor in biodegradability, and the BOD index is close to zero. In the design of the reclaimed water process route, it is difficult to obtain the ideal treatment effect by conventional anaerobic or aerobic biochemical treatment. For example, the use of activated carbon adsorption or advanced oxidation technology also has problems such as high operating costs.

Therefore, making full use of the water quality conditions of the coexistence of easily degradable organic matter and refractory organic matter in raw oil refinery sewage, on the basis of the existing "three old" aerobic biochemical units, add anaerobic hydrolysis process unit and ozone biological activated carbon treatment unit to form an "anaerobic biochemical unit". Oxygen biochemistry - aerobic biochemistry - ozone biological activated carbon" process design guideline for the advanced treatment of super heavy oil refinery wastewater, using raw sewage to cultivate easily degradable organic matter and maintain the anaerobic hydrolysis reaction environment of anaerobic microorganisms, fully treat refractory organic matter The hydrolysis of macromolecules, non-polar, cyclic and other refractory organic substances is decomposed into small molecular organic substances that are easy to be absorbed and utilized, which improves the biodegradability of water quality as a whole and improves the COD removal efficiency of aerobic biochemical processes. It is the most economical and effective technical solution to fundamentally improve the effluent quality of oil refinery sewage treatment, ensure the latest environmental protection discharge standards, establish good raw water quality conditions for subsequent sewage reuse projects, and reduce reclaimed water investment and operating costs.

Utility model content

The purpose of the utility model is to provide a device that can further treat the water discharged from the ultra-heavy oil refinery sewage after the pretreatment of the oil separation and air flotation combined process, so as to meet the re-use requirements of the refinery.

The ultra-heavy oil refinery sewage treatment device provided by the utility model includes: hydrolysis acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device, quartz sand filter device and ozone biological activated carbon reaction device device, wherein the hydrolytic acidification reaction device, the activated sludge method aerobic reaction device, the biofilm method aerobic reaction device, the precipitation reaction device, the quartz sand filter device and the ozone biological activated carbon reaction device are sequentially connected through pipelines.

Further, the above-mentioned ultra-heavy oil refinery sewage treatment device also includes an intermediate pool connected to the water inlet of the quartz sand filter device through a pipeline.

Further, the above-mentioned ultra-heavy oil refinery sewage treatment device also includes a backwashing device for cleaning the quartz sand filter device and the ozone biological activated carbon reaction device and connected thereto.

Further, the above-mentioned ultra-heavy oil refinery sewage treatment device also includes: via pipeline and hydrolysis acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device, ozone biological activated carbon reaction device and backwashing The device is connected and can treat the sludge produced by the hydrolysis acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device, ozone biological activated carbon reaction device and backwashing device Sludge treatment plant.

Further, the above-mentioned ultra-heavy oil refinery sewage treatment device also includes a clear water tank communicated with the ozone biological activated carbon reaction device through pipelines.

Further, the above-mentioned ultra-heavy oil refinery sewage treatment device also includes more than one device for feeding the hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device and ozone biological activated carbon reaction device A blower device that blows air in to promote biochemical reactions.

Preferably, the above-mentioned precipitation reaction device is respectively connected with the hydrolysis acidification reaction device and the activated sludge process aerobic reaction device through pipelines.

Preferably, the hydrolytic acidification reaction device includes: a biological selector, a stirring device, a microporous aeration device and a sludge selector arranged at the front end of the hydrolytic acidification device.

Preferably, the aerobic reaction device of the activated sludge method includes a sludge selector.

Preferably, the above-mentioned ozone bioactivated carbon reaction device comprises:

A water injector is connected with the quartz sand filter device through a pipeline;

The ozone contact reaction device is connected with the water injector through a pipeline;

An ozone generating system is connected with the ozone contact reaction device through a pipeline;

A biological activated carbon device is a reaction device for contacting the ozone through a pipeline.

In oil refinery sewage treatment, the use of the ultra-heavy oil refinery sewage treatment device in the utility model can fundamentally improve the effluent water quality of oil refinery sewage treatment, ensure that the latest discharge standards for environmental protection are met, and establish good raw water quality conditions for subsequent sewage reuse projects. Reclaimed water investment and operating costs are reduced, and all the devices used in this utility model are existing commercially available mature products. After combined use, the treated sewage can be discharged up to the standard, and with the use of the control device, it has the advantages of operation Advantages of convenience and low cost.

Description of drawings

Fig. 1 is the structural representation of the super heavy oil refinery wastewater advanced treatment device in the utility model;

Fig. 2 is a flow chart of the advanced treatment process of super heavy oil refinery sewage treatment in the utility model.

Explanation of reference signs

1. Biological selector; 2. Hydrolysis and acidification reaction device;

3. Stirring device; 4. Microporous aeration device;

5. Activated sludge method aerobic reaction device; 6. Biofilm method aerobic reaction device;

7. Ozone biological activated carbon reaction device 8. Precipitation reaction device;

9. Intermediate pool; 10. Quartz sand filter device;

11. Blowing device; 12. Water ejector;

13. Ozone generation system; 14. Ozone contact reaction device;

15. Biological activated carbon reaction device; 16. Clear water pool;

17. Sludge selector; 18. Backwashing device;

19. Sludge treatment device.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the ultra-heavy oil refinery sewage treatment device in the utility model includes a hydrolytic acidification reaction device 2, an activated sludge method aerobic reaction device 5, and a biofilm method aerobic reaction device 6 connected in sequence through pipelines , precipitation reaction device 8, intermediate pool 9, quartz sand filter device 10, ozone biological activated carbon reaction device 7, clear water tank 16, wherein:

The hydrolytic acidification reaction device 2 includes a biological selector 1 , a stirring device 3 , a microporous aeration device 4 and a sludge selector 17 . The ultra-heavy oil refinery sewage treated by pretreatment measures such as oil separation and air flotation first enters the bioselector 1, and is fully mixed with the high-concentration sludge returned from the biochemical system in the bioselector 1, which can prevent and alleviate Bulking of activated sludge. The role of the stirring device 3 is to make the activated sludge fully contact with the sewage and improve the treatment efficiency of the biological treatment system. The sludge selector 17 can select activated sludge with reduced activity, discharge the sludge from the hydrolysis acidification reaction device 2 and discharge it into the sewage treatment plant (station) via the sludge pump or the sludge discharge pipeline provided in the sludge selector The pool is regularly sent to the sludge treatment system. The sludge selector 17 also has the function of a sludge thickening tank, which can save the sludge thickening tank.

The activated sludge method aerobic reaction device 5 can adopt any process (such as AO, SBR, etc.) in the activated sludge method for treating sewage, and can be selected and determined according to the situation of sewage. The activated sludge method aerobic reaction device 5 includes a sludge selector 17 . The sludge selector 17 can select the activated sludge with reduced activity, discharge the activated sludge method aerobic reaction device 5 and discharge it into the sewage treatment plant (station ) to the sludge tank, which is regularly sent to the sludge treatment system. The sludge selector 17 also has the function of a sludge thickening tank, which can save the sludge thickening tank.

The biofilm aerobic reaction device 6 can adopt any process in the biofilm sewage treatment process (for example: biological aerated filter, contact oxidation method, etc.), and is selected and determined according to the incoming water of the sewage.

The precipitation reaction device 8 is used for sedimentation treatment of incoming water. In addition to communicating with the intermediate pool 9 and the aerobic reaction device 6 of the biofilm method, it is also connected to the front end of the hydrolysis acidification reaction device and the aerobic reaction of the activated sludge method through pipelines. The front end of the device 5 is connected so that the sludge obtained in the precipitation reaction device is returned to the hydrolysis acidification reaction device for reuse.

The ozone biological activated carbon reaction device 7 comprises an ozone generation system 13, a water injector 12, an ozone contact reaction device 14 and a biological activated carbon device 15, wherein:

The function of the water ejector 12 is to suck the ozone generated by the ozone generating system 13 into the pipeline through the lifting of the lift pump and the negative pressure generated by the water ejector 12, and the mixture of ozone and water enters the ozone contact reaction device 14. The effluent from the ozone contact reaction device 14 flows into the biological activated carbon reaction device 15 .

The ultra-heavy oil refining sewage treatment device in the utility model also includes:

Sludge treatment device 19 is communicated with hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device and ozone biological activated carbon reaction device through pipeline, and can react to described hydrolysis acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device and ozone biological activated carbon reaction device for sludge treatment.

The backwashing device communicates with the quartz sand filter device 10 and the biological activated carbon device 15 and is used for cleaning the quartz sand filter device 10 and the biological activated carbon device 15 .

The air blowing device is used to blow air into the hydrolytic acidification reaction device, the activated sludge method aerobic reaction device, the biofilm method aerobic reaction device, the precipitation reaction device and the ozone biological activated carbon reaction device to promote the biochemical reaction.

Utilizing the above-mentioned device, the advanced treatment process of ultra-heavy oil refinery sewage in the utility model includes the following steps:

1) After the pretreatment measures such as oil separation and air flotation combined process, the water enters the hydrolytic acidification reaction device 2, and the macromolecular organic matter in the sewage is decomposed into Small molecular organic matter improves the biodegradability of sewage;

2) The water treated by the hydrolytic acidification reaction device 2 enters the activated sludge method aerobic reaction device 5, and utilizes the microorganisms in the activated sludge method aerobic reaction device 5 to perform biodegradation treatment on the incoming water;

3) The water treated by the activated sludge method aerobic reaction device 5 enters the biofilm method aerobic reaction device 6, and the biofilm in the biofilm method aerobic reaction device 6 is used to further biodegrade the incoming water;

4) The water treated by the biofilm method aerobic reaction device 6 enters the precipitation reaction device 8, and the incoming water is subjected to precipitation treatment by the precipitation reaction device 8;

5) The water treated by the precipitation reaction device 8 enters the quartz sand filter device 10, and the incoming water is filtered by the quartz sand filter device 10, and the suspended matter in the incoming water is intercepted;

6) The water treated by the quartz sand filter device 10 enters the ozone biological activated carbon device, and the ozone biological activated carbon reaction device 7 is used to remove most of the organic matter and suspended matter in the incoming water. source of water.

In order to further ensure the normal operation of each device and ensure the water quality of the output, the more specific process of using the device of the present utility model is as follows: as shown in Figure 2

1. Hydrolytic acidification

In the ultra-heavy oil refinery sewage treatment device, a bioselector 1 is arranged at the front end of the hydrolysis acidification reaction device 2, and the volume of the bioselector 1 is 0.65%-1% of the daily treated water volume. Prevent and alleviate activated sludge bulking.

In this ultra-heavy oil refinery sewage advanced treatment device, a sludge selector 17 is arranged in the hydrolysis acidification tank of the hydrolysis acidification reaction device 2, and the volume of the sludge selector 17 is 0.15%-1% of the daily treatment water volume. Device 17 adopts the voluntary selection form of the upper shutter, and does not need power. The shutter width is 200-800mm, and the height is 800-2000mm. The shutters can be made of steel for anticorrosion, or corrosion-resistant materials such as PVC, UPVC, and PP can also be used. The sludge selector 17 uses the principle that the specific gravity of the activated sludge after the adsorption of petroleum hydrocarbons becomes smaller and it is easy to float, selects the activated sludge with reduced activity and discharges it from the hydrolysis acidification reaction device 2, and the sludge set in the sludge selector 17 The pump or the sludge discharge pipe are discharged into the sludge pond of the sewage treatment plant (station), and the sludge treatment device 19 is regularly sent. The sludge selector 17 also has the function of a sludge thickening tank, which can save the sludge thickening tank.

In the ultra-heavy oil refinery sewage treatment device, the hydrolysis acidification reaction device 2 is provided with a stirring device 3, that is, an underwater agitator, which promotes sufficient contact between the activated sludge and the sewage. Improve the treatment efficiency of the biological treatment system.

In this ultra-heavy oil refinery sewage treatment device, an underwater microporous aerator 4 is arranged in the hydrolysis acidification reaction device 2, and the air blower 11 supplies oxygen to the hydrolysis acidification tank of the hydrolysis acidification reaction device 2 to maintain dissolved oxygen. Control at 0-0.2 mg/L to ensure the high activity of facultative microorganisms and improve the treatment efficiency of the hydrolytic acidification reaction device 2.

2. Activated sludge process aerobic reaction

The sewage after hydrolysis and acidification enters the activated sludge aerobic reaction device 5, which can adopt any process (such as AO, SBR, etc.) Make selection OK. . The activated sludge method aerobic reaction device 5 includes a sludge selector 17 . The sludge selector 17 can select the activated sludge with reduced activity, discharge the activated sludge method aerobic reaction device 5 and discharge it into the sewage treatment plant (station ) to the sludge tank, which is regularly sent to the sludge treatment system. The sludge selector 17 also has the function of a sludge thickening tank, which can save the sludge thickening tank.

3. Biofilm aerobic reaction

The sewage treated by the activated sludge aerobic reaction enters the biofilm aerobic reaction device 6, which can adopt any process in the biofilm treatment sewage process (for example: biological aerated filter, contact oxidation method, etc.) The incoming water is further treated, and the process method is selected and determined according to the situation of the sewage incoming water.

4. Precipitation

The sewage treated by the biofilm aerobic reaction enters the precipitation reaction device 8, which settles the effluent after the above-mentioned biochemical treatment, and returns the sludge generated by the sedimentation to the front-end hydrolysis acidification reaction device 2 and the activated sludge process. The aerobic reaction device 5 is removed to ensure the concentration of activated sludge and enhance the efficiency of biochemical treatment.

5. Quartz sand filter

The precipitated sewage enters the quartz sand filter device 10, which is used as a pretreatment measure for the influent of the ozone biological activated carbon device to reduce the content of suspended solids and oily substances in the sewage, reduce ozone consumption, and increase the service life of activated carbon.

6. Ozone biological activated carbon

The sewage filtered by quartz sand enters the ozone biological activated carbon device, which includes an ozone generating system 13, a water injector 12, an ozone contact reaction device 14 and a biological activated carbon reaction device 15, wherein:

The function of the water ejector 12 is to suck the ozone generated by the ozone generating system 13 into the pipeline through the lifting of the lift pump and the negative pressure generated by the water ejector 12, and the mixture of ozone and water enters the ozone contact reaction device 14. The effluent from the ozone contact reaction device 14 flows into the biological activated carbon reaction device 15 .

Ozone decomposes in water to produce new ecological oxygen atoms with strong electrophilic or proton, and forms hydroxyl radicals·OH with strong oxidizing effect in water. HO·(E0=2.8V) has high potential, strong reaction ability and fast speed, which can trigger chain reaction and completely degrade many organic substances.

Ozonation increases H+ ions in water, forms more hydrogen bonds on the surface of activated carbon to neutralize electronegativity, greatly reduces the resistance of anions passing through the pores of activated carbon, reduces the diffusion resistance when pollutants are adsorbed, and improves the adsorption capacity of activated carbon.

The ozonated water contains residual ozone and sufficient oxygen, which makes the activated carbon filter column in an oxygen-enriched state, causing the bacteria to grow on the surface of the activated carbon. Through biosorption and oxidative degradation, the ability of the activated carbon to remove organic matter is significantly improved, and the service life is extended. life. The biodegradation process can decompose soluble organic matter into CO ₂ and H ₂ O or non-dissolved organic matter, forming a virtuous cycle of adsorption-desorption, and improving the adsorption capacity in disguise. Operation practice has proved that the use of biological oxidation characteristics to improve and stabilize water quality has increased the service life of activated carbon (more than 5 times) and reduced treatment costs.

7. Blast (aeration)

Most of the microorganisms participating in the reaction need to be carried out under oxygen-enriched conditions. The ultra-heavy oil refinery sewage treatment device also includes more than one blower device 11 for sending air to the hydrolysis acidification reaction device 2, the activated sludge method aerobic reaction device 5, and the biofilm Air is blown into the aerobic reaction device 6, the precipitation reaction device 8 and the ozone bioactivated carbon reaction device 7 to promote the biochemical reaction.

8. Sludge treatment

As the sewage treatment proceeds, the sludge in the hydrolytic acidification reaction device, the activated sludge method aerobic reaction device, the biofilm method aerobic reaction device, the precipitation reaction device and the ozone biological activated carbon reaction device continues to accumulate, and the sludge in these devices If the amount is too much, it will affect the quality of the effluent. When sludge appears in the effluent of the device, it is necessary to treat the sludge in the above device. Sludge treatment device 19 is communicated with hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device and ozone biological activated carbon reaction device through pipeline, and can be connected to described hydrolysis acidification reaction device , Activated sludge method aerobic reaction device, biofilm method aerobic reaction device, sedimentation reaction device and ozone biological activated carbon reaction device for the treatment of sludge.

9. Backwash

In order to keep the efficiency of filtering or adsorption reaction, the quartz sand filter device 10 and the biological activated carbon device 15 are regularly cleaned, and the backwash device 18 is communicated with it for cleaning the quartz sand filter device 10 and the biological activated carbon device 15, and the waste after backwashing is discharged into the sludge treatment plant 19 for treatment.

The sewage treated by the ultra-heavy oil refinery sewage treatment device of the utility model is discharged into the clear water pool 16 . The sewage treated by the ultra-heavy oil refinery sewage treatment device of the utility model has a COD≤50mg/L after measurement, which reaches the local standard for sewage general discharge (COD≤50mg/L) implemented in some areas in China, and has the advantages of convenient operation and easy operation. Advantages of low cost.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present utility model are all within the protection scope of the present utility model. The scope of protection of the utility model shall be determined by the claims.

Claims (10)

1. A super-heavy oil refinery wastewater treatment device, characterized in that it comprises: hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device, quartz sand filter device and ozone Biological activated carbon reaction device, wherein, the hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, precipitation reaction device, quartz sand filter device and ozone biological activated carbon reaction device are sequentially connected through pipelines . 2. The super-heavy oil refinery wastewater treatment device according to claim 1, further comprising an intermediate pool connected to the water inlet of the quartz sand filter device through a pipeline. 3. The advanced treatment device for ultra-heavy oil refinery sewage according to claim 1, further comprising a backwashing device for cleaning the quartz sand filter device and the ozone biological activated carbon reaction device and connected thereto. 4. The ultra-heavy oil refinery wastewater treatment device according to claim 3, further comprising: through pipelines and hydrolysis acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device, sedimentation The reaction device, the ozone biological activated carbon reaction device and the backwashing device are connected, and can be used for the hydrolysis and acidification reaction device, the activated sludge method aerobic reaction device, the biofilm method aerobic reaction device, the precipitation reaction device, and the ozone biological activated carbon reaction device A sludge treatment device that treats the sludge generated by the backwashing device. 5. The super-heavy oil refinery wastewater treatment device according to claim 1, further comprising a clear water tank communicated with the ozone biological activated carbon reaction device through pipelines. 6. The super-heavy oil sewage treatment device according to claim 1, characterized in that, it also includes more than one for the hydrolytic acidification reaction device, activated sludge method aerobic reaction device, biofilm method aerobic reaction device , Precipitation reaction device and ozone biological activated carbon reaction device to blow air into the air blowing device to promote biochemical reactions. 7. The super-heavy oil refinery sewage treatment device according to claim 1, characterized in that, the precipitation reaction device is respectively connected to the hydrolysis acidification reaction device and the activated sludge process aerobic reaction device through pipelines. 8. The super-heavy oil sewage treatment device according to claim 1, wherein the hydrolytic acidification reaction device comprises: a biological selector arranged at the front end of the hydrolytic acidification device, a stirring device, a microporous aeration device and Sludge selector. 9. The super-heavy oil refinery wastewater treatment device according to claim 1, characterized in that, the activated sludge process aerobic reaction device includes a sludge selector. 10. The ultra-heavy oil refinery sewage advanced treatment device according to claim 1, characterized in that, the ozone biological activated carbon reaction device comprises: A water injector is connected with the quartz sand filter device through a pipeline; The ozone contact reaction device is connected with the water injector through a pipeline; An ozone generating system is connected with the ozone contact reaction device through a pipeline; A biological activated carbon device is a reaction device for contacting the ozone through a pipeline.

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