CN111499027A - Closed oily sewage treatment system - Google Patents
Closed oily sewage treatment system Download PDFInfo
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- CN111499027A CN111499027A CN202010494789.6A CN202010494789A CN111499027A CN 111499027 A CN111499027 A CN 111499027A CN 202010494789 A CN202010494789 A CN 202010494789A CN 111499027 A CN111499027 A CN 111499027A
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- tank
- oil
- sewage
- lifting
- sludge
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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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
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to a closed oily sewage treatment system, which comprises a closed horizontal sewage lifting tank, an equal-regulation oil tank, a sludge lifting tank, an air flotation tank and a dirty oil lifting tank, wherein the sewage lifting tank conveys collected sewage into the equal-regulation oil tank; the oil tank is uniformly adjusted to send the treated sewage into the air flotation tank, the collected sump oil is sent into the sump oil lifting tank, and the collected sludge is sent into the sludge lifting tank; the oil tank is adjusted to pump out sewage from a water pumping port at the lower part of the oil tank through a circulating pump, and then the sewage is sent into a water inlet at the upper part of the oil tank to realize liquid level circulating water distribution. The invention adopts a complete and closed solution for treating oily sewage by lifting, homogenizing, adjusting and deoiling, thus avoiding air pollution, eradicating continuous oil-gas release sources and reducing explosion danger areas.
Description
Technical Field
The invention relates to the field of sewage treatment in petrochemical industry, in particular to a closed oily sewage treatment system.
Background
In the production, processing, storage and transportation processes of petrochemical enterprises, sewage containing oil, flammable, explosive and toxic media (hereinafter, collectively referred to as oil-containing sewage) is widely existed. At present, a system for collecting, transmitting and deoiling oily sewage is mainly composed of a sewage tank, a lift pump, a homogenizing tank, an adjusting tank, an oil separation tank, air floatation and the like, and has the following characteristics: the collecting facilities are basically open type water collecting ponds, and even a cover plate is additionally arranged, the collecting facilities are still not closed systems; the transmission process usually adopts pump pressure transmission; the system belongs to an open system, a large number of tank facilities cannot be completely closed, and dangerous environments such as oil gas pollution, fire hazard, explosion and the like exist.
The existing sewage collecting systems are mostly underground, are limited by the traveling distance and freezing prevention, have generally low water level and have more problems in pump selection and system design, and 1) the pump is in an explosion dangerous environment and needs to consider mechanical and electrical explosion prevention; 2) due to the influence of the characteristics of the pump, the sewage in the sewage tank is difficult to drain, so that residual sewage oil accumulates for a long time to form an explosion danger environment, the danger coefficient of operation is increased, and the environment is influenced; 3) the impeller is rotated at a high speed, so that oily sewage is emulsified, the oil removal difficulty of a subsequent working section is increased, noise pollution is caused, and discomfort is caused to a human body; 4) the pump selection is difficult when the water level is too low, and matched facilities such as a pump room and the like need to be additionally arranged under most conditions, so that the investment cost is increased.
The main facility of the existing oil-containing sewage oil removal treatment system is an oil separation tank. The prior oil separation tank has the following problems when sewage treatment is carried out: sludge is deposited and easy to block, a lower sludge tank is required for low-level sludge discharge, and construction and discharge are difficult; floating oil is accumulated, an oil scraper is needed, a lower-level sump oil pool is needed for low-level oil discharge, and construction and discharge are difficult; the oil separation tank is a self-flowing fixed liquid level oil removal process, is greatly influenced by fluctuation of water volume, is unstable in hydraulic state and is poor in oil removal effect.
Disclosure of Invention
The invention aims to provide a closed oily sewage treatment system, which can avoid air pollution, eliminate continuous oil-gas release sources and reduce the existence of explosion danger areas by lifting, homogenizing, adjusting, deoiling and the like of oily sewage in a fully-closed environment.
The object of the present invention and the technical problem to be solved are achieved by the following technical means. The closed oily sewage treatment system comprises a closed horizontal sewage lifting tank, an equal-regulation oil tank, a sludge lifting tank, an air flotation tank and a dirty oil lifting tank, wherein the sewage lifting tank conveys collected sewage into the equal-regulation oil tank; the oil tank is uniformly adjusted to send the treated sewage into the air flotation tank, the collected sump oil is sent into the sump oil lifting tank, and the collected sludge is sent into the sludge lifting tank; the uniform-adjustment oil tank pumps the sewage out of a water pumping port at the lower part of the uniform-adjustment oil tank through a circulating pump, and then the sewage is mixed with water in the horizontal sewage lifting tank through a water inlet at the upper part of the uniform-adjustment oil tank, and the liquid level circulation water distribution is realized through the annular water distribution device arranged on the liquid level.
The object of the present invention and the solution to the technical problems can be further achieved by the following technical measures.
In the closed oily sewage treatment system, the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank all use compressed gas input from the top of the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank as power to discharge the sewage/dirty oil/sludge in the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank from the bottom.
The closed oily sewage treatment system is characterized in that the top of each of the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank is provided with an exhaust port, and waste gas is discharged to a waste gas treatment facility through the exhaust ports.
In the closed oily sewage treatment system, the liquid level in the uniformly-adjusted oil removal tank is provided with a floating circulation oil collector, dirty oil collected by the oil collector automatically flows into the dirty oil lifting tank under the action of gravity, sewage after uniform oil removal in the uniformly-adjusted oil removal tank automatically flows into the air flotation tank from a liquid discharge port at the lower part of the storage tank, and sludge settled and accumulated at the bottom of the uniformly-adjusted oil removal tank automatically flows into the sludge lifting tank from a sludge discharge port at the bottom.
In the closed oily sewage treatment system, the sewage lifting tank is internally provided with a liquid level controller for detecting the liquid level of the sewage, and the liquid level controller controls the opening and closing of the air inlet valve on the compressed gas input pipeline and the air outlet valve on the air outlet pipeline on the top of the sludge lifting tank.
In the closed oily sewage treatment system, the oil tanks are all adjusted to have the function of temporarily storing sewage to adjust the capacity of the sewage lifting tank.
In the closed oily sewage treatment system, the compressed gas is air or nitrogen.
In the closed oily sewage treatment system, the uniform regulating oil tank is provided with a water distributor which uniformly sprays input sewage on the inner liquid surface of the uniform regulating oil tank.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the invention can achieve considerable technical progress and practicability, has wide industrial utilization value and at least has the following advantages: the invention is a complete and closed solution for treating oily sewage by lifting, homogenizing, adjusting and deoiling, thus avoiding air pollution, eradicating continuous oil-gas release sources and reducing explosion danger areas.
The lifting mode of a sewage pump is replaced by air pressure lifting of compressed gas (such as air or nitrogen) in the transmission process, the compressed gas can be compressed gas, compressed nitrogen and the like, and in petrochemical enterprises, factory systems can be used for providing the compressed gas, and air compression equipment can be provided for the compressed gas; the used waste gas is treated in a centralized way and can be used for downstream air floatation and biochemical facilities, so that the atmospheric pollution is avoided. The compressed gas (or a set of fan is provided) is used for replacing a plurality of sets of pumps, so that the energy efficiency is improved (a small sewage pump is started and stopped intermittently, the working condition of liquid level is changed, the efficiency is more than 60 percent, and the operation efficiency is favorably improved and the energy consumption is reduced by utilizing the factory compressed gas). The homogenizing and adjusting tank is transformed into the uniformly-adjusted oil removal tank, so that the occupied area is greatly reduced (the tank is replaced by a container, the explosion danger area is reduced, the fireproof space is reduced, an oil separation tank is omitted, a pump room is not needed, and the like), the investment is correspondingly reduced (a plurality of pumps, oil separation tanks and pump rooms are omitted, and the cost of the container is also reduced compared with that of the tank); the oil tanks are uniformly adjusted and mixed in a circulating mode of circulating pump water outlet backflow, so that the purpose of homogenization is achieved, and the homogenization is realized.
The system can be buried underground, beautifies the ground environment, adapts to the low-level design of a self-flowing sewer system, particularly in cold areas, cancels a sewage pump and a corresponding pump room, utilizes the uniformly-adjusted oil removal tank which is internally provided with a floating circulation oil collector, increases the functions of oil removal and sludge discharge by proper modification, replaces a sewage adjusting tank and an oil separation tank, and has the oil content of 150 mg/L in the outlet water of the oil separation tank, and the outlet water of the uniformly-adjusted oil removal tank is generally within 100 mg/L, thereby completely meeting the requirements of downstream air floatation water inlet.
The system of the invention is self-controlled, and is automatically interlocked with the air inlet valve and the exhaust valve through the liquid level, thereby being convenient for management.
Drawings
FIG. 1 is an overall schematic view of a closed oily sewage treatment system of the present invention;
FIG. 2 is a schematic view of sewage of the closed oily sewage treatment system of the present invention;
FIG. 3 is a schematic view of the closed oily sewage treatment system of the present invention for regulating oil.
[ description of main element symbols ]
1: sewage lifting tank
2: uniformly-adjusted oil tank
3, sludge lifting tank
4: air-float tank
5, dirty oil lifting tank
6: compressed gas
7: oily sewage
8: waste gas centralized treatment facility or air flotation/biochemical facility
9: oil-free treatment facility
10: lower stage sewage treatment process
11: sludge treatment facility
12: liquid level controller
13: circulating pump
14: water distributor
15: oil collecting device
16: oil delivery hose
OD oil-containing sewage
WO contaminated oil
And OS: sludge treatment
CA: compressed gas
TG: tail gas
XV-01: air inlet valve
XV-02: air exhaust valve
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made on the specific implementation, structure, features and effects of the closed oily sewage treatment system according to the present invention with reference to the accompanying drawings and preferred embodiments.
Please refer to fig. 1-3, which are schematic structural diagrams of parts of the closed oily sewage treatment system of the present invention, the system includes a closed sewage lift tank 1 for collecting and transporting oily sewage, a water outlet at the bottom of the sewage lift tank is connected to a water inlet of a water distributor 14 on the closed oil uniform-adjustment tank 2 through a pipeline, the oil uniform-adjustment tank 2 transports dirty oil to a dirty oil lift tank 5 through a dirty oil transport pipeline connected to a dirty oil outlet at the upper part of one side of the oil uniform-adjustment tank, the oily sewage is transported to an air flotation tank 4 through an oily sewage transport pipeline connected to the lower part of one side of the oil uniform-adjustment tank, a sludge discharge port is further provided at the bottom of the oil uniform-adjustment tank 2, and the sludge is transported to the sludge lift tank 3 through a sludge transport pipeline connected to the sludge.
The oily sewage lifting tank 1, the sludge lifting tank 3 and the dirty oil lifting tank 5 all provide power for conveying substances to the next stage through compressed gas. Namely, the oily sewage stored in the sewage lifting tank 1 dispersedly arranged in the factory is lifted to the uniform regulating oil tank under the action of the compressed gas input from the top of the sewage lifting tank 1, the dirty oil collected by the oil collector in the uniform regulating oil tank 2 automatically flows into the dirty oil lifting tank 5 under the action of gravity from the dirty oil discharge port, and the dirty oil in the dirty oil lifting tank is lifted to the dirty oil treatment facility 9 under the action of the compressed gas input from the upper part of the dirty oil lifting tank. The oily sewage which is regulated, homogenized and deoiled in the oil tank 2 is automatically flowed into the air floating tank 4 under the action of gravity, and the oily sewage in the air floating tank 4 is lifted to a next-stage sewage treatment process 10 under the action of compressed gas input from the tank top after being subjected to air floating treatment.
The waste gas in the sewage lifting tank 1, the sludge lifting tank 3, the air flotation tank 4 and the dirty oil lifting tank 5 is discharged to a waste gas centralized treatment facility or an air flotation/biochemical facility 8.
In the embodiment of the invention, the sewage lifting tank 2 controls the input of compressed gas and the discharge of lifting waste gas through the liquid level controller 12, namely the liquid level controller for monitoring the liquid level in the sewage lifting tank 2 is also respectively connected with an air inlet valve on a compressed gas input pipeline and an air outlet valve on an air outlet pipeline of the sewage lifting tank 2 and controls the opening and closing states of the air inlet valve and the air outlet valve, when the air outlet valve XV-02 is in an opening state, oil-containing sewage automatically flows into a closed container (sewage lifting tank), when the liquid level is increased to a high level (H), the air outlet valve is closed, the air inlet valve XV-01 is opened, and the oil-containing sewage is pressed and lifted to an even regulating oil tank through the water outlet pressure, when the liquid level in the sewage lifting tank is reduced to a low liquid level (L), the air inlet valve XV-01 is closed, the air outlet valve XV-02 is opened.
In the embodiment of the invention, the dirty oil lifting tank, the air flotation tank and the sludge lifting tank are also internally provided with a liquid level controller for monitoring the liquid level in the tanks, and the liquid level controller is automatically interlocked with an air inlet valve on a compressed gas input pipeline on the top of the tank and an air outlet valve on an air outlet pipeline to control the opening and the closing of the air inlet valve and the air outlet valve.
In the embodiment of the invention, the water distributor in the uniformly-adjusted oil tank 2 uniformly sprays the oily sewage entering the uniformly-adjusted oil tank on the liquid level of the uniformly-adjusted oil tank. The lower portion of the oil tank is also provided with a water pumping port, sewage at the lower portion of the oil tank is pumped out through the water pumping port by the circulating pump 13 and is sent into the oil tank again through the water inlet above the oil tank, circulation water distribution of the liquid level is achieved, and the settling speed and settling effect of the sewage are enhanced. In the embodiment of the invention, a floating circulation oil collector 15 is arranged on the liquid level of the oil tank 2, and the circulation oil collector 15 conveys the dirty oil received by the circulation oil collector to a dirty oil outlet on the oil tank 2 through a hose 16, and the dirty oil is discharged to a dirty oil lifting tank from the dirty oil outlet. According to the invention, the homogeneous capacity (GB50747-2012 & lt petrochemical industry wastewater treatment design Specification) of 8-12 hours is utilized, the water is distributed by liquid surface circulation, and water is collected (discharged) at the bottom, so that the water forms a uniform downward slow flow state, and the hydraulic state is kept stable. The invention has the advantages that the sinking flow rate is within 0.3mm/s, the oil particles float to the liquid level by utilizing the small specific gravity of the oil particles and the floating speed which is higher than the sinking speed of the water body, the oil removal is finished, and an adjusting tank and an oil separation tank are replaced.
In the embodiment of the invention, the speeds of the discharged liquid and the conveyed liquid in the uniformly adjusted oil tank 2 are consistent, namely, the liquid level in the uniformly adjusted oil tank is basically unchanged.
The oil tank can be temporarily used as an adjusting tank, the lower part of the oil tank is the homogenizing capacity meeting the homogenizing function, the upper part of the oil tank is the adjusting capacity meeting the adjusting function, when the water inflow is greater than the water outflow, the liquid level in the oil tank gradually rises to realize the adjusting function, and the oil tank can meet the capacity adjusting requirement within 12-24 hours.
The compressed gas is air or nitrogen.
The air pressure lifting mode adopted by the invention is particularly suitable for lifting the closed pressure of the sewage of each device (the emission standard of pollutants in petroleum refining industry (GB30570-2015) and the closed sewage pressure conveying requirement in the design specification of petrochemical engineering environmental protection (SH/T3024-2017)), and actually forms a system solution for closed pressure conveying of the oil-containing sewage of the whole plant.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a closed oily sewage treatment system which characterized in that: the system comprises a closed horizontal sewage lifting tank, an equal-regulation oil removal tank, a sludge lifting tank, an air flotation tank and a dirty oil lifting tank, wherein the horizontal sewage lifting tank conveys collected sewage into the equal-regulation oil removal tank; the oil tank is uniformly adjusted to send the treated sewage into the air flotation tank, the collected sump oil is sent into the sump oil lifting tank, and the collected sludge is sent into the sludge lifting tank; the uniform oil adjusting tank pumps the sewage out from a water pumping port at the lower part of the uniform oil adjusting tank through a circulating pump, and the uniform oil adjusting tank is mixed with the water from the horizontal sewage lifting tank through a water inlet at the upper part of the uniform oil adjusting tank, so that the circular water distribution of the liquid surface is realized through an annular water distribution device arranged above the liquid surface of the uniform oil adjusting tank.
2. The closed oily sewage treatment system according to claim 1, characterized in that: the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank all use compressed gas input from the tops of the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank as power to discharge sewage/dirty oil/sludge in the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank from the bottoms.
3. The closed oily sewage treatment system according to claim 2, characterized in that: the top of the horizontal sewage lifting tank, the sludge lifting tank, the air flotation tank and the dirty oil lifting tank are respectively provided with an exhaust port, and waste gas is discharged to a waste gas treatment facility or conveyed to the air flotation facility for secondary utilization through the exhaust ports.
4. The closed oily sewage treatment system according to claim 2, characterized in that: the device comprises an oil collecting device, an oil storage tank, an air flotation tank, a bottom sludge discharge port, an oil collecting device, a floating circulation oil collecting device, an oil collecting device, a sludge lifting tank, a sludge settling tank and a sludge discharging port, wherein the floating circulation oil collecting device is arranged on the liquid level in the oil collecting device, sump oil collected by the oil collecting device automatically flows into the sump oil lifting tank under the action of gravity, sewage after the oil is uniformly removed from the oil collecting tank automatically flows into the air flotation tank from the liquid discharge port at the lower part of the storage tank, and sludge settled.
5. The closed oily sewage treatment system according to claim 3, wherein: wherein the sewage lifting tank, the dirty oil lifting tank, the air flotation tank and the sludge lifting tank are internally provided with liquid level controllers for monitoring the liquid level in the sewage lifting tank, and the liquid level controllers are used for controlling the opening and closing of an air inlet valve on a compressed gas input pipeline at the top of the tank and an exhaust valve on an exhaust pipeline.
6. The closed oily sewage treatment system according to claim 2, characterized in that: the upper part of the uniformly-adjusted oil tank is the adjusting capacity meeting the adjusting function, and the lower part of the uniformly-adjusted oil tank is the homogenizing capacity meeting the homogenizing function, so that the liquid level height in the tank is the same as the water inlet flow and the water outlet flow when the homogenizing function is realized; when the adjusting function is realized, the liquid level in the tank is gradually increased when the inflow is larger than the outflow.
7. The closed oily sewage treatment system according to claim 2, characterized in that: wherein the compressed gas is air or nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010494789.6A CN111499027A (en) | 2020-06-03 | 2020-06-03 | Closed oily sewage treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010494789.6A CN111499027A (en) | 2020-06-03 | 2020-06-03 | Closed oily sewage treatment system |
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| Publication Number | Publication Date |
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| CN111499027A true CN111499027A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010494789.6A Pending CN111499027A (en) | 2020-06-03 | 2020-06-03 | Closed oily sewage treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230003572A1 (en) * | 2021-06-30 | 2023-01-05 | Endress+Hauser Conducta Gmbh+Co. Kg | Interface sensor and operating method of an interface sensor |
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2020
- 2020-06-03 CN CN202010494789.6A patent/CN111499027A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230003572A1 (en) * | 2021-06-30 | 2023-01-05 | Endress+Hauser Conducta Gmbh+Co. Kg | Interface sensor and operating method of an interface sensor |
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