CN115432882A - Short-process closed treatment method for oil refining sewage - Google Patents
Short-process closed treatment method for oil refining sewage Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
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- C02F2209/16—Total nitrogen (tkN-N)
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/302—Nitrification and denitrification treatment
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Abstract
A short-flow closed treatment method for oil refining sewage comprises the steps that oil refining sewage is sequentially subjected to oil removal through an oil separation tank and a cyclone flotation device; the sewage treated by the cyclone floating device enters an anoxic tank, and the sewage, nitrate-state liquid refluxed by the aerobic tank, activated sludge refluxed by a settling tank, microorganisms and a carbon source are treated in the anoxic tank; the sewage treated by the anoxic tank enters an aerobic tank, and the sewage, the activated sludge, the microorganisms and the alkaline solution which flow back through the sedimentation tank are treated in the aerobic tank; one part of the sewage treated by the aerobic tank flows back to the anoxic tank to generate nitration and denitrification coupling reaction, and the other part of the sewage enters the sedimentation tank; and (3) the water treated by the settling tank enters the next unit for discharging, part of the separated activated sludge respectively flows back to the anoxic tank and the aerobic tank, and the other part flows to the sludge concentration tank to wait for sludge treatment. The invention can realize the device, the sealing and the high efficiency of the whole sewage treatment, and save the occupied area and the operation cost.
Description
Technical Field
The invention relates to the technical field of biochemical treatment of sewage, in particular to a short-flow closed treatment method for oil refining sewage.
Background
Oily sewage is generated in the raw oil processing process of a refining enterprise, pollutants of the oily sewage mainly comprise oil, sulfide, volatile phenol, ammonia nitrogen and other toxic substances, the COD content is high, the quantity of difficultly-degradable substances is large, the biodegradability is poor, and the pH change of the sewage is large. At present, three old sewage treatment processes of 'oil separation tank → air flotation tank → biochemical treatment' are widely adopted in sewage treatment plants of domestic refining and chemical enterprises, and the traditional three old sewage treatment processes have the disadvantages of large capital construction and equipment investment, high operation and maintenance cost, long hydraulic retention time or treatment time, large flow floor area and poor load impact resistance. Meanwhile, the oil separation tank, the air flotation tank and the biological aeration tank of each refining enterprise are all non-closed structures, and malodorous gas can be drifted out in the operation process, so that unorganized gas emission is caused. The existing improvement measures are mainly to add a glass fiber reinforced plastic gas collection sealing cover, collect and treat the waste gas in an open pool by an exhaust fan, and uniformly enter an odor treatment system for treatment. On one hand, the oil separation tank, the air flotation tank and the biological aeration tank are easy to break down due to the addition of the sealing cover, so that the workload of operators is increased, and the stable and efficient operation of the sewage treatment device is influenced; on the other hand, the added deodorization system often has the problems of unstable operation, low removal rate and the like, and the stable operation of the system has to be ensured by measures such as optimizing the outlet flow of the fan, increasing the nutrient solution of the biological section and the like, so that the operation, maintenance and management cost is increased to a certain extent. Therefore, it is necessary to realize the installation, sealing and high efficiency of the refinery sewage treatment.
Chinese patent CN103102040A discloses a method for treating organic matter in oil refining sewage, which is mainly characterized in that oil substances in the sewage difficult to biodegrade are fully separated by adopting the traditional oil separation and flotation treatment process, the sewage enters a primary biochemical tank after being deoiled to remove organic matter capable of being biodegraded in the sewage, the remaining organic matter difficult to biodegrade adopts a chemical oxidation technology to rapidly decompose macromolecular organic matter difficult to biodegrade into organic matter capable of being biodegraded, and the organic matter difficult to biodegrade in the sewage is removed through chemical oxidation to improve the biodegradability of the sewage. And finally, removing the biodegradable organic matters which are converted from the organic matters difficult to be degraded by microorganisms by adopting a secondary biochemical tank. The invention is convenient for collecting and treating the waste gas of the device through the device and the sealing of the treatment tank, and can reduce the influence on the environment in the oil refining sewage treatment process.
Chinese patent CN106915863A discloses an oil refining sewage biological treatment device, it includes: the system comprises a hydrolysis acidification tank, an aeration tank, a primary sedimentation tank, a LINPOR tank and a final sedimentation tank, wherein sewage enters from the bottom of the hydrolysis acidification tank and rises and then passes through a sludge bed, and the sludge bed intercepts and adsorbs granular substances and colloidal substances flowing into the sewage; and pure oxygen is introduced into the aeration tank. The invention can shorten the sewage treatment process, save the occupied area and improve the treatment efficiency.
Chinese patent CN106007209A discloses a petroleum refining sewage oil-removing pretreatment process, which mainly comprises a hydrocyclone coarse-grained polymerized oil-water separator for removing fine oil grains which cannot be removed by a three-phase hydrocyclone separation floating oil collecting and oil discharging adjusting tank; then the oily sewage enters a front-end stirring area of a dissolved air floatation device, a demulsifier and a flocculant are added, and the agent is fully contacted with oil in the sewage through stirring to generate demulsification and flocculation reactions, so that floc is separated out from water; the stirred oily sewage enters a rear-end air floating area of the dissolved air floating device, bubbles generated by a releaser contact and adhere to tiny suspended matters in the sewage, the suspended matters float upwards and are separated from water under the action of buoyancy, and the oil content of the sewage reaches the standard by scraping residues; and conveying the sewage subjected to dissolved air floatation treatment to a biochemical system of a sewage treatment field for biochemical treatment. The invention can shorten the oil removing process, save the dosage of the medicament and reduce the operation cost by the cyclone floating oil removing device.
According to the prior art disclosed above, the problems of the installation, the sealing and the short flow of the whole oil refining sewage treatment process are not solved at the same time while the installation, the sealing and the short flow of the sewage treatment are studied respectively.
Disclosure of Invention
The invention aims to solve the problems of installation, sealing and high efficiency of the conventional oil refining sewage treatment, and provides a short-flow sealing treatment method for oil refining sewage, which can realize installation, sealing and high efficiency of the whole sewage treatment, obviously improve the removal efficiency and the impact resistance, facilitate the collection of waste gas, avoid secondary pollution and save the occupied area and the operation cost.
In order to achieve the purpose, the invention provides the following technical scheme: a short-flow closed treatment method for oil refining sewage comprises the steps that oil refining sewage is sequentially subjected to oil removal through an oil separation tank and a cyclone flotation device;
the sewage treated by the cyclone floating device enters an anoxic tank, microorganisms used for denitrification reaction and biological carriers capable of being attached by the microorganisms are put into the anoxic tank, meanwhile, carbon sources used for denitrification reaction are continuously or discontinuously put into the anoxic tank, and the sewage, nitrate state liquid flowing back through the aerobic tank, activated sludge flowing back through a settling tank, the microorganisms and the carbon sources are treated in the anoxic tank;
the sewage treated by the anoxic tank enters an aerobic tank, microorganisms used for nitration reaction and biological carriers capable of being attached by the microorganisms are put into the aerobic tank, meanwhile, alkaline solution is continuously or discontinuously put into the aerobic tank, and the sewage and the activated sludge, the microorganisms and the alkaline solution which are refluxed by a settling tank are treated in the aerobic tank;
one part of the sewage treated by the aerobic tank flows back to the anoxic tank to generate nitration and denitrification coupling reaction, and the other part of the sewage enters the sedimentation tank;
and (3) the water treated by the settling tank enters the next unit for discharging, part of the separated activated sludge respectively flows back to the anoxic tank and the aerobic tank, and the other part flows to the sludge concentration tank to wait for sludge treatment.
The oil refining sewage short-flow closed treatment method is further optimized as follows: the oil refining sewage meets the conditions that the pH is 6-9, the COD is 500-1000mg/L and the NH content is 3 -N =20-60mg/L, TN =40-80mg/L, and petroleum =50-120 mg/L.
The oil refining sewage short-flow closed treatment method is further optimized as follows: the petroleum content of the sewage treated by the oil separation tank is 100-300 mg/L, and the hydraulic retention time of the cyclone floating device is not more than 10min.
The oil refining sewage short-flow closed treatment method is further optimized as follows: the water quality of the inlet water of the anoxic tank meets the conditions that the pH is = 6-9, the COD is less than or equal to 700mg/L, and NH is generated 3 N is less than or equal to 80mg/L, TN is less than or equal to 100mg/L, and petroleum is less than or equal to 30mg/L.
The short-process closed treatment method for the oil refining wastewater provided by the invention is further optimized as follows: the hydraulic retention time in the anoxic tank is 4h.
The oil refining sewage short-flow closed treatment method is further optimized as follows: the biological carrier in the aerobic tank is an MBBR filler composite carrier.
The oil refining sewage short-flow closed treatment method is further optimized as follows: the hydraulic retention time in the aerobic tank is 10h.
The short-process closed treatment method for the oil refining wastewater provided by the invention is further optimized as follows: the settling tank adopts a tree flow inclined plate settling tank, and the settling time is 1.5 hours.
The oil refining sewage short-flow closed treatment method is further optimized as follows: and the sewage treated by the aerobic tank completely enters a degassing tank for treatment, one part of the water treated by the degassing tank flows back to the anoxic tank, and the other part of the water enters a settling tank for treatment.
The oil refining sewage short-flow closed treatment method is further optimized as follows: the reflux ratio of the nitrate liquid refluxed to the anoxic tank is controlled to be between 1.5 and 4.5.
The invention has the following beneficial effects:
1. the short-flow closed treatment method for oil refining sewage, disclosed by the invention, adopts a combined device of air flotation oil removal and an A/O fluidized bed, realizes the device formation, has high oil refining sewage treatment efficiency, short hydraulic retention time and strong water impact resistance, and can replace an oil separation tank, a primary air flotation tank, a secondary air flotation tank, a primary biochemical tank, a secondary biochemical tank, an ozone catalytic oxidation tank and an aeration biological filter tank in the sewage treatment plant of the existing refinery enterprises compared with the traditional process, realize the short-flow treatment and low-cost treatment of the oil refining sewage, reduce the floor area and save the cost and the operating cost. Meanwhile, the whole process can realize the sealing of the device, the device can stably and efficiently operate, the waste gas generated in the sewage treatment process is convenient to collect so as to facilitate the subsequent treatment of the waste gas, and the pollution of the waste gas to the environment is reduced.
2. Compared with the traditional oil removal measures, the cyclone floating oil removal method has the advantages of good treatment effect, high treatment efficiency, short hydraulic retention time, less addition of the agent and small occupied area, and creates favorable conditions for subsequent procedures.
3. Compared with the traditional A/O process, the invention adopts three-phase separation and flow type suspension filler to strengthen mass transfer, improves the treatment efficiency, greatly shortens the hydraulic retention time, simultaneously realizes aeration reduction, greatly reduces the exhaust emission and can realize the centralized collection and treatment of the exhaust.
Drawings
FIG. 1 is a flow chart of a short-flow closed treatment method for oil refining wastewater;
FIG. 2 is a schematic structural diagram of an air flotation device;
FIG. 3 is a schematic diagram of the construction of an anoxic tank;
FIG. 4 is a schematic structural view of an aerobic tank;
the mark in the figure is: 1. the device comprises a cyclone flotation device, 11, an inner cylinder, 12, a sewage inlet, 13, a micro-bubble generator, 14, a sewage outlet, 15, an oil residue outlet, 2, an anoxic tank, 21, a water distributor, 22, a first guide cylinder, 23, a flow impeller, 3, an aerobic tank, 31, a three-phase separation device, 32, a second guide cylinder, 33, a biological carrier, 34 and an aerator.
Detailed Description
The following detailed description of the preferred embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1: a short-flow closed treatment method for oil refining sewage comprises the following steps:
oil refining sewage first passes through oil removal tank and air flotation device 1 in proper order and degreases, and air flotation device 1 adopts the mode that microbubble and cyclone separation combined together. The structure of the air flotation device 1 is shown in fig. 2, and specific reference can be made to the mature prior art. Sewage enters a pipeline of the micro-bubble generator 13 through a sewage pump to form gas-water mixed liquid, then enters the cyclonic floating device 1 to form micro-rotational flow in the cyclonic floating device 1, oil and suspended matters are discharged from the top of the cyclonic floating device 1, and the treated sewage is discharged from the bottom of the cyclonic floating device 1 and enters a subsequent treatment process.
The cyclone floating oil removal device can reduce the hydraulic retention time, improve the shock resistance of the system, improve the oil removal efficiency and realize that the oil removal rate reaches 90 percent. In the cyclone floating oil removal process, the removal rate of soluble BOD and COD is low, but the cyclone floating oil removal removes oil which is difficult to be biochemically degraded in sewage, directly improves the biodegradability of the sewage, and prevents oil drops from wrapping the periphery of sludge in biochemical reaction to influence the biochemical reaction; meanwhile, the cyclone floating device 1 can remove suspended matters, solid scum and the like in the sewage together, so that the influence of the suspended matters, the solid scum and the like on the sludge activity in the subsequent biochemical reaction is prevented, the biodegradability of the sewage is further improved, and favorable conditions are created for the subsequent biological fluidized bed pretreatment process.
Under the condition that the petroleum content of the sewage treated by the oil separation tank is 100-300 mg/L, the content of the processed water-petroleum oil is lower than 30mg/L, and the hydraulic retention time of the single stage of the cyclone floating oil removal is not more than 10min.
The sewage treated by the cyclone floating device 1 enters the anoxic tank 2, the anoxic tank 2 is filled with the microorganism used for denitrification reaction and the biological carrier 33 capable of being attached by the microorganism, and simultaneously, the anoxic tank 2 is filled with carbon source used for denitrification reaction continuously or discontinuously. Wherein the microorganism is selected from anaerobe and facultative aerobe, and the carbon source is selected from methanol carbon source. The sewage treated by the cyclone floating device 1, the nitrate liquid refluxed by the aerobic tank 3, the activated sludge refluxed by the settling tank, the microorganism and the methanol carbon source are treated in the anoxic tank 2.
The anoxic tank 2 may be provided therein with a first draft tube 22, a flow impeller 23 and a water distributor 21, and the structure of the anoxic tank 2 is shown in fig. 3, which refers to the mature prior art. The first guide cylinder 22 has a guiding function on one hand for sewage and can play a wear-resisting role on the other hand to protect the anoxic tank 2. The flow pusher 23 can prevent sludge in sewage from precipitating, play a role in stirring uniformly, reduce the impact of incoming water and improve the mass transfer efficiency. The water distributor 21 is mainly used for distributing water uniformly, so that sewage can stably enter a treatment system, and the influence on the microbial treatment effect due to large water inlet fluctuation is prevented. Through the optimization to internals such as water-locator 21, first draft tube 22, propeller in the oxygen deficiency jar 2, can realize that the device does not shut down and overhauls, the hydraulic power dwell time is 4h in the oxygen deficiency jar 2, and hydraulic power dwell time shortens by a wide margin.
The sewage treated by the anoxic tank 2 enters the aerobic tank 3, the biological carriers 33 containing the microorganisms for nitration and capable of being attached by the microorganisms are put into the aerobic tank 3, and meanwhile, the alkaline solution is continuously or discontinuously put into the aerobic tank 3. The sewage treated by the anoxic tank 2 and the activated sludge, the microorganisms and the alkaline solution which are returned by the sedimentation tank are treated in the aerobic tank 3. Wherein, the microorganism selects anaerobic bacteria and facultative bacteria, the biological carrier 33 adopts MBBR filler composite carrier, which improves the mass transfer efficiency in the aerobic tank 3 by more than 10%.
The alkaline solution is Na 2 CO 3 The solution is used for increasing the alkalinity in the aerobic tank 3 so as to meet the requirement of the nitrification reaction in the aerobic tank 3. The structure of the aerobic tank 3 is shown in figure 4, and the mature prior art can be referred to. The aerobic tank 3 adopts a disc type micropore gas distributor, so that the particle size of bubbles can be greatly reduced. Meanwhile, the aerobic tank 3 strengthens three-phase mass transfer, and can improve the mass transfer efficiency by more than 20 percent. The top of the aerobic tank 3 adopts a three-phase separation device 31, which is convenient for the separation of gas, liquid and solid and prevents the loss of the filler. The aerobic tank 3 is internally provided with a second guide cylinder 32 which plays a role in guiding sewage. In order to provide sufficient oxygen required for the reaction in the aerobic tank 3, the bottom of the aerobic tank 3 is provided with an aerator 34, and the fan simultaneously provides required power for the biological carriers 33 in the aerobic tank 3 to form a fluidized state through the aerator 34, so that the aeration amount required by the aerobic tank 3 is reduced by about 80 percent compared with the conventional aeration amount, and the cost is further reduced. The hydraulic retention time in the aerobic tank 3 is 10h, and the hydraulic retention time is greatly shortened.
One part of the sewage treated by the aerobic tank 3 flows back to the anoxic tank 2 to generate nitration and denitrification coupling reaction, and the other part enters the sedimentation tank.
Part of the nitrate liquid in the aerobic tank 3 flows back to the anoxic tank 2, and the total nitrogen removal rate is improved by about 20 percent through the coupling of aerobic nitrification and anoxic denitrification. The water treated by the aerobic tank 3 flows back to the anoxic tank 2 through the nitrate liquid reflux pump, and the reflux ratio can be adjusted according to actual conditions and is generally controlled to be 1.5-4.5.
And the sewage treated by the sedimentation tank enters the next unit for discharging, one part of the separated activated sludge respectively flows back to the anoxic tank 2 and the aerobic tank 3, and the other part of the separated activated sludge flows to a sludge concentration tank to wait for sludge treatment.
Wherein, the settling tank adopts a tree flow inclined plate settling tank, and the settling time is 1.5 hours. The supernatant of the settling tank is treated effluent, and flows to the next tank by gravity for discharging. The sludge settled at the bottom of the settling tank flows back to the anoxic tank 2 through the sludge reflux pump, and the reflux ratio can be adjusted according to actual conditions. The outlet pipe of the sludge reflux pump is provided with a branch pipe, and residual sludge is intermittently or continuously discharged to the sludge concentration tank.
The device of the biological fluidized bed technology mainly comprises an anoxic tank 2, an aerobic tank 3 and a settling tank, and can simultaneously remove organic matters, nitrogen, phosphorus and other pollutants in sewage. The anoxic tank 2, the aerobic tank 3 and the settling tank all belong to closed devices, waste gas generated in the reaction process is easy to collect, and the waste gas is easy to treat.
The water quality of the inlet water of the anoxic tank 2 meets the conditions that the pH is = 6-9, the COD is less than or equal to 700mg/L, and NH is added 3 Under the conditions that-N is less than or equal to 80mg/L, TN is less than or equal to 100mg/L and petroleum is less than or equal to 30mg/L, the effluent index reaches pH = 6-9, COD is less than or equal to 50mg/L and NH is treated by a fluidized bed 3 the-N is less than or equal to 8mg/L, and the TN is less than or equal to 20 mg/L.
Because the content of dissolved oxygen in the water treated by the aerobic tank 3 is high, part of nitrate liquid with high content of dissolved oxygen flows back to the anoxic tank 2, and the anoxic tank 2 needs very low content of dissolved oxygen, the reaction rate of microorganisms in the anoxic tank 2 can be reduced, and the hydraulic retention time is prolonged. In order to solve this problem, a degassing tank is provided between the aerobic tank 3 and the settling tank, and a part of the sewage treated by the degassing tank is returned to the anoxic tank 2, and the other part is introduced into the settling tank. Namely, a degassing tank is arranged behind the aerobic tank 3, a sedimentation tank is arranged, and the nitrate liquid treated by the degassing tank flows back to the anoxic tank 2. The degassing tank can remove the content of dissolved oxygen in the effluent of the aerobic tank 3, so that nitrate liquid can conveniently flow back to the anoxic tank 2 for denitrification reaction to remove total nitrogen.
The field test shows that:
the quality of oil refining sewage, namely system inlet water meets the conditions that the pH is 6-9, the COD is 500-1000mg/L and NH is added 3 Under the conditions of-N =20-60mg/L, TN =40-80mg/L and petroleum =50-120mg/L, after the treatment of the air flotation and A/O biological fluidized bed, the effluent index reaches pH = 6-9, COD is less than or equal to 40mg/L, NH 3 N is less than or equal to 8mg/L, TN is less than or equal to 15mg/L, and the effluent quality is superior to the direct discharge standard of the emission standard of pollutants for petroleum refining industry (GB 31570-2015).
Compared with the traditional sewage treatment method, the method has the advantages that the occupied area is reduced by about 1/2, the waste gas is reduced by about 80%, the excess sludge is reduced by about 30%, and the operation cost is saved by about 30%.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (10)
1. A short-flow closed treatment method for oil refining sewage is characterized by comprising the following steps:
oil refining sewage sequentially passes through an oil separation tank and an air floatation device to be subjected to oil removal;
the sewage treated by the cyclone floating device enters an anoxic tank, a biological carrier containing microorganisms for denitrification reaction and capable of being attached by the microorganisms is thrown into the anoxic tank, a carbon source for denitrification reaction is continuously or discontinuously thrown into the anoxic tank, and the sewage, nitrate liquid refluxed by an aerobic tank, activated sludge refluxed by a settling tank, the microorganisms and the carbon source are treated in the anoxic tank;
the sewage treated by the anoxic tank enters an aerobic tank, microorganisms used for nitration reaction and biological carriers capable of being attached by the microorganisms are put into the aerobic tank, meanwhile, alkaline solution is continuously or discontinuously put into the aerobic tank, and the sewage and the activated sludge, the microorganisms and the alkaline solution which are refluxed by a settling tank are treated in the aerobic tank;
one part of the sewage treated by the aerobic tank flows back to the anoxic tank to perform nitrification and denitrification coupling reaction, and the other part of the sewage enters the sedimentation tank;
and (3) the water treated by the settling tank enters the next unit for discharging, one part of the separated activated sludge respectively flows back to the anoxic tank and the aerobic tank, and the other part of the separated activated sludge flows to a sludge concentration tank to wait for sludge treatment.
2. The short-flow closed treatment method for oil refining wastewater as claimed in claim 1, which is characterized in that: the oil refining sewage meets the condition that the pH is = 6-9＝500～1000mg/L，NH 3 -N =20-60mg/L, TN =40-80mg/L, and petroleum =50-120 mg/L.
3. The short-flow closed treatment method for oil refining wastewater as claimed in claim 1, which is characterized in that: the petroleum content of the sewage treated by the oil separation tank is 100-300 mg/L, and the hydraulic retention time of the cyclone floating device is not more than 10min.
4. The short-process closed treatment method for oil refining wastewater according to claim 1, characterized by comprising the following steps: the water quality of the inlet water of the anoxic tank meets the conditions that the pH is = 6-9, the COD is less than or equal to 700mg/L, and NH is generated 3 N is less than or equal to 80mg/L, TN is less than or equal to 100mg/L, and petroleum is less than or equal to 30mg/L.
5. The short-process closed treatment method for oil refining wastewater according to claim 1, characterized by comprising the following steps: the hydraulic retention time in the anoxic tank is 4h.
6. The short-process closed treatment method for oil refining wastewater according to claim 1, characterized by comprising the following steps: the biological carrier in the aerobic tank is an MBBR filler composite carrier.
7. The short-flow closed treatment method for oil refining wastewater as claimed in claim 1, which is characterized in that: the hydraulic retention time in the aerobic tank is 10h.
8. The short-process closed treatment method for oil refining wastewater according to claim 1, characterized by comprising the following steps: the settling tank adopts a tree flow inclined plate settling tank, and the settling time is 1.5 hours.
9. The short-process closed treatment method for oil refining wastewater according to claim 1, characterized by comprising the following steps: and the sewage treated by the aerobic tank completely enters a degassing tank for treatment, one part of the water treated by the degassing tank flows back to the anoxic tank, and the other part of the water enters a settling tank for treatment.
10. The short-flow closed treatment method for oil refining wastewater according to claim 1 or 9, which is characterized in that: the reflux ratio of the nitrate liquid refluxed to the anoxic tank is controlled to be between 1.5 and 4.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210884174.3A CN115432882A (en) | 2022-07-26 | 2022-07-26 | Short-process closed treatment method for oil refining sewage |
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| CN202210884174.3A CN115432882A (en) | 2022-07-26 | 2022-07-26 | Short-process closed treatment method for oil refining sewage |
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