CN112551832A - Treatment method of high-concentration overhaul sewage - Google Patents
Treatment method of high-concentration overhaul sewage Download PDFInfo
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- CN112551832A CN112551832A CN202011602690.XA CN202011602690A CN112551832A CN 112551832 A CN112551832 A CN 112551832A CN 202011602690 A CN202011602690 A CN 202011602690A CN 112551832 A CN112551832 A CN 112551832A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a treatment method of high-concentration overhaul sewage, which comprises the following steps: introducing the overhaul sewage into a degassing tank and an acidic water storage tank for degassing and deoiling treatment; introducing the degassed and deoiled overhaul sewage into a stripping tower for stripping purification, so that most of organic pollutants reach a boiling point and are discharged into a sulfur recovery device from the top of the stripping tower; and introducing the maintenance sewage subjected to steam stripping purification into an aeration tank and a clarification tank for biochemical treatment, detecting the maintenance sewage subjected to biochemical treatment, discharging the maintenance sewage after the water quality reaches the standard, and otherwise introducing the maintenance sewage into the aeration tank for retreatment. The high-concentration maintenance sewage treatment system is designed by adopting the idea of steam stripping and biochemical treatment in a breakthrough manner, so that various pollutants in maintenance sewage can be effectively treated, harmless treatment is realized, the maintenance sewage is ensured to be discharged up to the standard, the high-concentration maintenance sewage treatment system has the advantages of simple structure, environmental protection, high efficiency, easiness in operation, safety, reliability and the like, and the treatment cost of the maintenance sewage is effectively saved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a treatment method of high-concentration overhaul sewage.
Background
The oil refining and chemical engineering integrated device is production equipment at the core of the petrochemical industry, and shutdown and large overhaul are needed if the equipment has large faults in the production process. During maintenance, operations such as boiling, steam purging, chemical cleaning (passivation) and the like performed on equipment and facilities such as towers, tanks, capacities, heat exchangers and the like are required to be performed in a closed manner, the produced chemical cleaning (passivation) wastewater, the produced steam purging discharge water, and various types of wastewater (hereinafter referred to as "maintenance wastewater") such as production process wastewater, equipment flushing water, device returning top water and the like generated in a shutdown stage have huge water volume, and the pollutant components are extremely complex, if the wastewater is directly discharged, serious environmental pollution is caused, so that the wastewater needs to be collected and treated in a centralized manner until the wastewater meets the discharge standard, and then is discharged and treated in a unified manner.
The detection shows that the water quality condition of the overhaul sewage of the oil refining and chemical engineering integrated device is shown in the following table:
TABLE 1 high concentration Overhaul wastewater quality conditions
| Analysis item | Maximum value | Minimum value | Mean value of |
| pH value | 11.6 | 9.8 | 11.0 |
| COD /mg/L | 10390.0 | 1185.0 | 3593.8 |
| Ammonia nitrogen/mg/L | 32.3 | 12.2 | 21.2 |
| sulfide/mg/L | 66.1 | 18.6 | 33.6 |
| benzene/mg/L | 398.5 | 59.7 | 140.1 |
| xylene/mg/L | 79.5 | 16.7 | 37.3 |
In the prior art, the high-concentration overhaul sewage is treated by adopting an air floatation and biochemical treatment process, and the specific treatment process comprises the following steps: firstly, discharging overhaul sewage into a sewage adjusting tank, and adding a proper amount of acid to control the pH value to realize demulsification; then, the overhaul sewage is discharged into a DAF air floatation tank and an EGFU high-efficiency air floatation tank in sequence, and proper PAC and PAM are added in sequence for air floatation treatment; then, discharging the overhaul sewage subjected to air floatation treatment into an aeration tank for aeration treatment, adding a proper amount of active carbon to adsorb benzene series, reducing the influence of a chemical cleaning agent on activated sludge, and adding a biological synergist to improve the activity of the sludge so as to improve the aeration effect; and finally, discharging the biochemically treated overhaul sewage into a clarification tank for precipitation, introducing the supernatant after precipitation into a monitoring tank for water quality detection, and discharging the effluent after the effluent meets the discharge standard.
The treatment process has the following defects: (1) although the treatment process can effectively treat easily degradable organic matters in high-concentration overhaul sewage, the treatment effect on the difficultly degradable harmful chemical substances is poor, the average value of the treatment amount is only 2t/h, and the efficiency is extremely low; (2) in order to demulsify, the pH value of the front end needs to be controlled between 4 and 5, but besides sewage maintenance, the treatment device also needs to treat other production wastewater in the petrochemical production process, and the pH value is difficult to control due to frequent fluctuation of the quality of the incoming water, so that the sewage pipeline is easy to perforate and corrode, and even leak; (3) due to the fact that the pH value of biochemical inflow water is low due to front-end demulsification, the adding amount of alkali liquor needs to be increased after sewage enters biochemistry, otherwise sludge can float upwards, and a large amount of PAC and PAM need to be added in an air floatation stage, the cost of the whole treatment process is high, economic burden is increased for petrochemical production enterprises, and the environment-friendly risk that water quality of a discharge port exceeds the standard also exists.
Based on the method, the high-concentration overhaul sewage treatment method which is environment-friendly, efficient, low in cost and easy to operate is provided.
Disclosure of Invention
The invention provides a treatment method of high-concentration overhaul sewage, and mainly aims to solve the problems.
The invention adopts the following technical scheme:
a treatment method of high-concentration overhaul sewage comprises the following steps:
(1) degassing: introducing the overhaul sewage into a degassing tank for degassing treatment, and discharging the removed oil gas into a conventional torch;
(2) oil removal: introducing the degassed overhaul sewage into an acidic water storage tank for static oil separation treatment, and discharging the removed sump oil into a sump oil tank;
(3) stripping: introducing the maintenance sewage subjected to oil removal treatment into a stripping tower for stripping purification, so that most of organic pollutants reach a boiling point and are discharged into a sulfur recovery device from the top of the stripping tower;
(4) and (3) biochemical treatment: introducing the maintenance sewage after steam stripping purification into an aeration tank for aeration treatment, and degrading residual organic pollutants by using microorganisms;
(5) and (3) precipitation: introducing the biochemically treated overhaul sewage into a clarification tank for flocculation and precipitation, so as to separate impurity particles from water;
(6) and (3) detection: and detecting the overhaul sewage after the precipitation treatment, discharging the overhaul sewage after the water quality reaches the standard, and otherwise introducing the overhaul sewage into an aeration tank for retreatment.
Further, in the step (3), the overhaul sewage from the acidic water storage tank enters the stripping tower from the 45-layer tower plate of the stripping tower for stripping treatment after the heat exchange of the overhaul sewage by the heat exchanger is carried out to 90-95 ℃.
Further, in the step (3), a proper amount of alkali liquor needs to be added into the stripping tower in the stripping process.
Further, in the step (3), the temperature of the top of the stripping column should be controlled to be 88-98 ℃, and the temperature of the bottom of the stripping column should be controlled to be 123-131 ℃.
Further, in the step (3), the overhead pressure of the stripping tower should be controlled to be 0.08-0.13MPa, and the overhead pressure of the stripping tower should be controlled to be 0.12-0.19 MPa.
Further, in the steps (3) and (4), the maintenance sewage after steam stripping purification is pumped out by a purified water pump at the bottom of the tower, and is introduced into an aeration tank for biochemical treatment after heat exchange and temperature reduction to 40-45 ℃ by a heat exchanger.
Further, in the step (4), the water quality standard of the inlet water of the aeration tank is as follows: pH: 7-8.5; the content of sulfide is less than or equal to 30 mg/L; COD is less than or equal to 500 mg/L; benzene is less than or equal to 0.1 mg/L; toluene is less than or equal to 0.1 mg/L; the petroleum is less than or equal to 20 mg/L.
Further, the effluent quality standard of the clarification tank is PH: 6-9; the sulfide is less than or equal to 1 mg/L; COD is less than or equal to 60 mg/L; benzene is less than or equal to 0.1 mg/L; toluene is less than or equal to 0.1 mg/L; the petroleum is less than or equal to 5 mg/L.
Further, in the step (4), a proper amount of PAM is required to be added into the tail part of the aeration tank in the aeration treatment process.
Further, in the step (3), under the stripping action of the stripping tower, benzene, xylene, methanol, ethanol, acetone, hexane, triethylamine, carbon tetrachloride, heptane, sulfur-containing and ammonia nitrogen-containing industrial sewage treatment agents, ferrous sulfide efficient passivators and refinery unit oil scale complete cleaning agents in the overhaul sewage can reach boiling points and are discharged from the top of the stripping tower.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the pollutant characteristics of the overhaul sewage, the high-concentration overhaul sewage treatment system is designed by adopting the idea of steam stripping and biochemical treatment in a breakthrough manner, so that various pollutants in the overhaul sewage can be effectively treated, the harmless treatment is realized, the standard discharge of the overhaul sewage is ensured, and the overhaul sewage treatment system has the advantages of simple structure, environmental protection, high efficiency, easiness in operation, safety, reliability and the like, and effectively saves the treatment cost of the overhaul sewage.
2. The method for treating the overhaul sewage provided by the invention provides a better way for treating the high-concentration overhaul sewage by using the sewage treatment device in the future, and provides a good reference significance for how to store and treat the high-concentration overhaul sewage generated in the overhaul period during the shutdown and large overhaul period of the oil refining and chemical device.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a sewage tank; 2. a sewage tank; 3. a high concentration sewage lift pump; 4. a conventional torch; 5. a degassing tank; 6. an acid water storage tank; 7; a sump oil tank; 8. a lift pump; 9. a stripping column; 10. a sulfur recovery unit; 11. alkali liquor; 12. a reboiler; 13. a condensation water tank; 14. purifying the water pump; 15. a blower; 16. an aeration tank; 17. a clarification tank; 18. a mud scraper; 19. a sludge reflux pump; 20. a water outlet; 21. a reboiler heat source; 22. condensing water; 23. a heat exchanger.
Detailed Description
The following describes specific embodiments of the present invention. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details.
Referring to fig. 1, a high concentration overhauls sewage treatment system, including stripping apparatus and biochemical treatment unit, the stripping apparatus includes stripping tower 9, heat exchanger 23 and purified water pump 14; the biochemical treatment device comprises an aeration tank 16 and a clarification tank 17 which are communicated with each other; the stripping tower 9 is connected with a sewage water source for overhauling through a heat exchanger 23 and is communicated with the aeration tank 16 through a purified water pump 14 and the heat exchanger 23, and the top of the stripping tower 9 is communicated with the sulfur recovery device 10 through a gas output pipeline. When the sewage is treated, firstly, the overhaul sewage is subjected to heat exchange through a heat exchanger 23 and heated to a specified temperature, then introduced into a stripping tower 9 for stripping treatment, so that organic matters which are difficult to degrade in the water reach a boiling point, and sent to a sulfur recovery device 10 from the top of the stripping tower 9 for incineration treatment, the overhaul sewage subjected to stripping purification is subjected to heat exchange through a heat exchanger 23 and cooled to a specified temperature through a purification water pump 14, and then discharged into an aeration tank 16 for aeration treatment, so that the residual organic matters in the water are decomposed by microorganisms, and COD is reduced; and the maintenance sewage after the aeration treatment can be discharged after reaching the standard through sedimentation treatment in a clarification tank. Therefore, the high-concentration overhaul sewage treatment system is designed according to the pollutant characteristics of the overhaul sewage by adopting the idea of steam stripping and biochemical treatment in a breakthrough manner, has the advantages of simple structure, high treatment efficiency, easiness in operation, safety, reliability and the like, and effectively saves the treatment cost of the overhaul sewage.
Referring to fig. 1, the treatment system further includes a pretreatment apparatus including a sewage tank 1, a degassing tank 5, and an acidic water storage tank 6, which are connected in sequence; the top of the degassing tank 5 is connected with a conventional torch 4 through a gas collection pipeline; the top of the acidic water storage tank 6 is connected with a sump oil tank 7 for collecting sump oil, and the acidic water storage tank 6 is communicated with the heat exchanger 23 through a lifting pump 8, so that a maintenance sewage source is provided for the stripping tower 9. The pretreatment device can play the effect of degassing and deoiling to the maintenance sewage, can preliminarily remove partial organic matters, and enables the maintenance sewage to be better stripped and purified and biochemically treated.
Referring to fig. 1, the pretreatment apparatus further includes a wastewater tank 2 and a high-concentration wastewater lift pump 3 disposed between the wastewater tank 1 and the degassing tank 5. Since the degassing tank 5, the acidic water storage tank 6, the stripping tower 9 and other equipment are usually installed in a designated plant and are far away from the effluent tank 1, the problem of the long distance between the effluent tank 1 and the degassing tank 5, the acidic water storage tank 6 and the stripping tower 9 can be effectively solved by installing the effluent tank 2, the high-concentration effluent lift pump 3 and the connecting pipe network.
Referring to fig. 1, the stripping apparatus further includes a reboiler 12, one end of the reboiler 12 is connected to the bottom of the stripping column 9, the other end is connected to the sidewall of the stripping column 9, and the reboiler 12 is connected to a reboiler heat source 21. Part of the stripped overhaul sewage is left to the reboiler 12 from the bottom of the stripping tower 9, is heated by the reboiler heat source 21 to be partially vaporized, and returns to the stripping tower 9 from the side wall of the stripping tower 9; the other part is discharged by the purified water pump 14, exchanges heat by the heat exchanger 23, is cooled and then is discharged to the aeration tank 16 for aeration treatment. Preferably, the reboiler heat source 21 of the stripping column is 0.9 to 1.0 MPa steam. Further, a condensate tank 13 for recovering steam is connected to the reboiler 12.
Referring to fig. 1, the side wall of the stripping tower 9 is provided with an alkali liquor feeding hole, and the solid ammonia nitrogen content in water can be reduced by adding alkali liquor 11 into the water through the alkali liquor feeding hole, so that the solid ammonia nitrogen can be discharged up to the standard.
Referring to fig. 1, as a preferred embodiment: the stripping tower 9 has plate-type tower in the 1-45 layers and packed tower in the top.
Referring to fig. 1, the bottom of the aeration tank 16 is provided with a microporous aeration pipe, and the oxygen provided to the aerobic microorganisms in the aeration tank 16 by the blower 15 has a high utilization rate, so that the aeration effect can be improved.
Referring to fig. 1, a sludge scraper is provided in the clarifier 17, and a sludge return pump 19 and a sludge return pipe for returning sludge to the aeration tank 16 are provided.
The following description of a specific method for treating high-concentration overhaul wastewater based on the above treatment system:
(1) degassing: introducing the overhaul sewage in the sewage pool 2 into a degassing tank 5 through a high-concentration sewage lifting pump 3 for degassing treatment, and discharging the removed oil gas into a conventional torch 4; in the process, the oil gas in the overhaul sewage can be primarily separated.
(2) Oil removal: and introducing the degassed maintenance sewage into an acidic water storage tank 6 for static oil separation treatment so as to separate dirty oil in the maintenance sewage, and discharging the removed dirty oil into a dirty oil tank 7. In the process, due to the difference of density, the dirty oil separated from the water is gradually gathered on the water surface, when the thickness of the dirty oil layer reaches the high alarm of the liquid level indication, the dirty oil is discharged from the tank and sent to the dirty oil tank 7, and the dirty oil is sent out by the dirty oil pump intermittently, so that the dirty oil in the dirty water is separated and overhauled.
(3) Stripping: and introducing the overhaul sewage subjected to the oil removal treatment into a stripping tower 9 for stripping and purification, so that most of organic pollutants reach a boiling point and are discharged from the top of the stripping tower 9 into a sulfur recovery device 10. In the process, the overhaul sewage in the acidic water storage tank 6 enters the stripping tower 9 from the 45-layer tower plate of the stripping tower 9 after being subjected to heat exchange to 95 ℃ by the lifting pump 8 through the heat exchanger 23, flows from top to bottom in the stripping tower 9, and is in contact with the steam generated by the reboiler 12 to be stripped, so that most of refractory organic matters in the overhaul sewage reach the boiling point and are discharged to the sulfur recovery device 10 from a gas output pipeline at the top of the tower for incineration treatment.
(4) And (3) biochemical treatment: the maintenance sewage after the steam stripping purification is introduced into an aeration tank 16 for aeration treatment, and the residual organic pollutants are degraded by microorganisms. In the process, most of the overhaul sewage subjected to stripping purification is discharged into the aeration tank 16 after being subjected to heat exchange and temperature reduction through the heat exchanger 23 from the bottom of the stripping tower 9 by the purification water pump 14, and organic pollutants are decomposed by the aid of aerobic microorganisms (mainly aerobic bacteria) under the condition of an aerobic state and a proper pH value, so that COD (chemical oxygen demand) in the overhaul sewage is reduced. In the aeration process, PAM with proper amount can be added at the tail part of the aeration tank according to the actual treated water quantity and water quality so as to improve the reaction effect.
(5) And (3) precipitation: the biochemically treated overhaul wastewater is introduced into a clarification tank 17 for flocculation and sedimentation, so that impurity particles are separated from the water. In the process, the sludge scraper 18 in the clarifier 17 is periodically operated to scrape off the settled sludge and transfer the sludge from the sludge-return pump 16 to the aeration tank 16 through the sludge-return pipe for reuse.
(7) And (3) detection: and detecting the overhaul sewage after the precipitation treatment, discharging the overhaul sewage after the water quality reaches the standard, and otherwise introducing the overhaul sewage into the aeration tank 16 for retreatment. In the process, the clarification tank 17 is provided with a water outlet 20, and the water quality of the water outlet only needs to be detected during detection.
Referring to fig. 1, specifically, in step (3), an appropriate amount of alkali liquor 11 needs to be added into the stripping tower 9 through an alkali liquor feeding port in the stripping process to reduce the content of solid ammonia nitrogen in water, so that the solid ammonia nitrogen can reach the discharge standard.
Referring to fig. 1, specifically, in steps (3) and (4), the stripped and purified overhaul sewage is pumped out by a purified water pump 14 at the bottom of the tower, and is introduced into an aeration tank 16 for biochemical treatment after being subjected to heat exchange and temperature reduction to 40 ℃ by a heat exchanger 23. In the actual treatment process, an air cooler can be additionally arranged at the rear end of the heat exchanger 23, the maintenance sewage after steam stripping purification is firstly subjected to heat exchange to 85-90 ℃ through the heat exchanger 23, then is cooled to 40 ℃ through the air cooler, and finally is introduced into the aeration tank 16.
Referring to FIG. 1, specifically, in step (3), the temperature of the top of the stripping column 9 should be controlled to be 88-98 ℃, the temperature of the bottom of the stripping column should be controlled to be 123-131 ℃, and the pressure of the top of the stripping column 9 should be controlled to be 0.08-0.13MPa, and the pressure of the top of the stripping column should be 0.12-0.19MPa, so as to ensure that most of the organic contaminants in the service wastewater can be effectively removed. More specifically, the boiling points of the organic contaminants in the service wastewater are shown in the following table:
TABLE 2 boiling point table for high concentration sewage organic pollutants
| Serial number | Name of principal Components | Boiling point/. degree. | Treatment method | |
| 1 | Benzene and its derivatives | 80.1 | Stripping | |
| 2 | Toluene | 110.6 | Stripping | |
| 3 | Methanol | 64.5 | Stripping | |
| 4 | Ethanol | 78.3 | Stripping | |
| 5 | Acetone (II) | 56.2 | Stripping | |
| 6 | Hexane | 68.7 | Stripping | |
| 7 | Triethylamine | 89.6 | Stripping | |
| 8 | Propiophenone | 216.5 | | |
| 9 | Carbon tetrachloride | 76.75 | Stripping | |
| 10 | Heptane (Heptane) | 98.4 | Stripping | |
| 11 | Sulfur-and ammonia-nitrogen-containing industrial sewage treatment agent/ZCJ-961 | 100 | Stripping | |
| 12 | High-efficiency ferrous sulfide passivator/FZC-1 | 100 | Stripping | |
| 13 | Oil dirt cleaning agent/RFC-2 for refining device | 72 | Stripping |
As can be seen from the above table, in the overhaul sewage, the boiling points of benzene, xylene, methanol, ethanol, acetone, hexane, triethylamine, carbon tetrachloride, heptane, sulfur-containing and ammonia nitrogen industrial sewage treatment agent/ZCJ-961, ferrous sulfide high-efficiency passivator/FZC-1 and oil scale complete cleaning agent/RFC-2 of a refining device are all lower than 111 ℃, so that the benzene, the xylene, the methanol, the ethanol, the acetone, the hexane, the triethylamine, the carbon tetrachloride, the heptane, the sulfur-containing and ammonia nitrogen industrial sewage treatment agent/ZCJ-961, the ferrous sulfide high-efficiency passivator/FZC-1 and the oil scale complete cleaning agent/RFC-. Although propiophenone cannot be removed in the stripper 9, it can be partially de-oiled in the sour water tank 6. The degassed sewage enters 5500m3The acid water storage tank 6 is kept still for degreasing, and the water-oil interface in the tank is maintained at about 13m so as to ensure that the retention time of the overhaul sewage in the tank exceeds 35 h. From water, due to differences in densityThe dirty oil separated from the sewage treatment tank is gradually gathered on the water surface, and when the thickness of the dirty oil layer reaches the high alarm indicated by the liquid level, the dirty oil layer is discharged from the tank and is sent to a dirty oil tank 7, and then the dirty oil is sent out intermittently by a dirty oil pump, so that the propiophenone and other dirty oil are effectively removed. In conclusion, most of the organic pollutants which are difficult to degrade in the overhaul sewage can be effectively removed in the pretreatment device and the stripping device, and part of the residual organic pollutants which are easy to degrade are quickly degraded in the biochemical treatment device, so that the high-concentration overhaul sewage is effectively treated, and the standard discharge is ensured.
Referring to fig. 1, specifically, in order to effectively control the effluent quality and ensure the discharge reaching the standard, in step (4), the standard of the influent quality of the aeration tank 16 (i.e., the effluent quality of the stripping tower 9) should be ensured as follows: pH: 7-8.5; the content of sulfide is less than or equal to 30 mg/L; COD is less than or equal to 500 mg/L; benzene is less than or equal to 0.1 mg/L; toluene is less than or equal to 0.1 mg/L; the petroleum is less than or equal to 20mg/L, and the effluent quality standard of the clarification tank 17 is ensured to be PH: 6-9; the sulfide is less than or equal to 1 mg/L; COD is less than or equal to 60 mg/L; benzene is less than or equal to 0.1 mg/L; toluene is less than or equal to 0.1 mg/L; the petroleum is less than or equal to 5 mg/L.
After the actual field detection, the treatment conditions of the overhaul sewage are shown in the following table:
TABLE 3 Overhaul wastewater treatment Water quality Condition
The analysis data in table 3 show that the removal rate of sulfide, COD, benzene and other characteristic pollutants in the overhaul sewage can reach more than 99% by adopting a steam stripping and biochemical treatment scheme, and the requirements of national standard 'emission standard of pollutants for petroleum refining industry' (GB 31570-2015) are met. Therefore, the invention can effectively treat various pollutants in the overhaul sewage and ensure that the pollutants reach the standard to be discharged, and has the advantages of simple method, high efficiency, environmental protection, safety and reliability.
The general design idea of the invention is as follows: according to the pollutant characteristic research of high-concentration overhaul sewage, the air floatation and biochemical treatment process in the background art is low in treatment efficiency and poor in effect, and certain functional groups of most of nondegradable organic pollutants in the overhaul sewage, such as aromatic hydrocarbon, azo and the like, are difficult to degrade by microorganisms, so that the process becomes a limiting step of biochemical reaction and is not suitable for direct biochemical treatment. However, researches show that the boiling points of most of refractory organic pollutants in the overhaul sewage, such as benzene, xylene, methanol, ethanol, acetone, hexane, triethylamine, carbon tetrachloride, heptane, sulfur-containing and ammonia nitrogen industrial sewage treatment agent/ZCJ-961, ferrous sulfide high-efficiency passivator/FZC-1 and refinery unit oil dirt full cleaning agent/RFC-2, are within the effective treatment range of the stripping tower, so that the invention breakthroughs in a stripping and biochemical treatment mode, firstly, high-concentration overhaul sewage is sent to the stripping tower to be discharged from the top of the stripping tower 9 by adopting a steam stripping method and heating through steam, the refractory organic pollutants reach the boiling points and are discharged from the top of the stripping tower, and the overhaul sewage after stripping purification is introduced into the biochemical treatment device from the bottom of the stripping tower to be further treated, thereby reducing the treatment pressure of the biochemical treatment device, avoid high concentration to overhaul sewage and cause the impact for biochemical treatment device.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. A treatment method of high-concentration overhaul sewage is characterized by comprising the following steps: the method comprises the following steps:
(1) degassing: introducing the overhaul sewage into a degassing tank for degassing treatment, and discharging the removed oil gas into a conventional torch;
(2) oil removal: introducing the degassed overhaul sewage into an acidic water storage tank for static oil separation treatment, and discharging the removed sump oil into a sump oil tank;
(3) stripping: introducing the maintenance sewage subjected to oil removal treatment into a stripping tower for stripping purification, so that most of organic pollutants reach a boiling point and are discharged into a sulfur recovery device from the top of the stripping tower;
(4) and (3) biochemical treatment: introducing the maintenance sewage after steam stripping purification into an aeration tank for aeration treatment, and degrading residual organic pollutants by using microorganisms;
(5) and (3) precipitation: introducing the biochemically treated overhaul sewage into a clarification tank for flocculation and precipitation, so as to separate impurity particles from water;
(6) and (3) detection: and detecting the overhaul sewage after the precipitation treatment, discharging the overhaul sewage after the water quality reaches the standard, and otherwise introducing the overhaul sewage into an aeration tank for retreatment.
2. The method of claim 1, further comprising the step of: in the step (3), the overhaul sewage from the acidic water storage tank enters the stripping tower from the 45-layer tower plate of the stripping tower after being subjected to heat exchange by the heat exchanger to 90-95 ℃ for stripping treatment.
3. The method of claim 1, further comprising the step of: in the step (3), a proper amount of alkali liquor needs to be added into the stripping tower in the stripping process.
4. The method of claim 1, further comprising the step of: in the step (3), the temperature of the top of the stripping tower is controlled to be 88-98 ℃, and the temperature of the bottom of the stripping tower is controlled to be 123-131 ℃.
5. The method of claim 1, further comprising the step of: in the step (3), the overhead pressure of the stripping tower is controlled to be 0.08-0.13MPa, and the overhead pressure of the stripping tower is controlled to be 0.12-0.19 MPa.
6. The method of claim 1, further comprising the step of: in the steps (3) and (4), the maintenance sewage after steam stripping purification is pumped out by a purification water pump at the bottom of the tower, and is introduced into an aeration tank for biochemical treatment after heat exchange and temperature reduction of 40-45 ℃ by a heat exchanger.
7. The method of claim 1, further comprising the step of: in the step (4), the water quality standard of the inlet water of the aeration tank is as follows: pH: 7-8.5; the content of sulfide is less than or equal to 30 mg/L; COD is less than or equal to 500 mg/L; benzene is less than or equal to 0.1 mg/L; toluene is less than or equal to 0.1 mg/L; the petroleum is less than or equal to 20 mg/L.
8. The method of claim 1, further comprising the step of: in the step (6), the effluent quality standard of the clarification tank is PH: 6-9; the sulfide is less than or equal to 1 mg/L; COD is less than or equal to 60 mg/L; benzene is less than or equal to 0.1 mg/L; toluene is less than or equal to 0.1 mg/L; the petroleum is less than or equal to 5 mg/L.
9. The method of claim 1, further comprising the step of: in the step (4), a proper amount of PAM is required to be added to the tail part of the aeration tank in the aeration treatment process.
10. The method of claim 1, further comprising the step of: in the step (3), under the stripping action of the stripping tower, benzene, xylene, methanol, ethanol, acetone, hexane, triethylamine, carbon tetrachloride, heptane, sulfur-containing and ammonia nitrogen-containing industrial sewage treatment agents, ferrous sulfide high-efficiency passivators and oil scale complete cleaning agents in the overhaul sewage can reach boiling points and are discharged from the top of the stripping tower.
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