CN112142234A - Efficient treatment and recycling system and method for oily wastewater of thermal power plant - Google Patents
Efficient treatment and recycling system and method for oily wastewater of thermal power plant Download PDFInfo
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- CN112142234A CN112142234A CN202011140342.5A CN202011140342A CN112142234A CN 112142234 A CN112142234 A CN 112142234A CN 202011140342 A CN202011140342 A CN 202011140342A CN 112142234 A CN112142234 A CN 112142234A
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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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
Abstract
The invention discloses a system and a method for efficiently treating and recycling oily wastewater of a thermal power plant, wherein a water outlet of an incoming water pipe of the oily wastewater is communicated with an inlet of an oil separation tank, an overwater buoy is arranged in the oil separation tank, an outlet of an oil collecting pipe of the overwater buoy is communicated with an inlet of an oil floating collector, an oil liquid discharge port at the upper part of the oil floating collector is communicated with an inlet of a recovery oil tank, and a wastewater discharge port at the bottom of the oil floating collector is connected with a water inlet of the oil separation tank; the system and the method can realize the high-efficiency treatment and reuse of the oily wastewater of the thermal power plant, and have the characteristics of small floor area, low cost and difficult blockage.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and relates to a system and a method for efficiently treating and recycling oily wastewater of a thermal power plant.
Background
The method mainly comprises the following steps that firstly, the oil tank needs to be sprayed with water for cooling in a high-temperature season, and the part of sprayed water is generated only in summer; secondly, the oil tank can be dehydrated due to gravity separation when stored for a long time, so that the sewage needs to be discharged from the bottom of the oil tank regularly, and the oil-containing waste water is small in quantity and belongs to non-frequent waste water; thirdly, flushing water from an oil unloading platform, a turbine room oil operation area, an oil extraction machine room and the like is used, the water quantity of the flushing water is small, and the water quantity is about 2-3 m3D; fourth is oil laden rain from the tank area.
The existing forms of oil in the wastewater comprise floating oil, dispersed oil, emulsified oil and dissolved oil. At present, the mainstream treatment process of the oily wastewater of the thermal power plant comprises two major types, wherein the first type is that the oily wastewater is simply treated by an oil separation tank and then discharged outside, but the oil separation tank can only remove floating oil and dispersed oil with larger particle size, and has no removal capability on emulsified oil and dissolved oil; the second type is that the air flotation method is adopted to treat the oily wastewater, in order to improve the efficiency of air flotation oil removal, a coagulant is generally added, and the commonly adopted treatment process flow is 'oily wastewater → coagulation → air flotation tank → filtration'. The air flotation technology for treating the oily wastewater has some problems. Firstly, the water content of the oily wastewater of the thermal power plant is small, and the average water content is about 5-10 m3However, the air floatation process has more supporting equipment, including an air floatation tank, a dissolved air releaser, a pressure dissolved air tank, an air compressor, a slag scraper and the like, which results in large occupied area and high equipment investment and operating cost. Secondly, there is a releaser clogging problem, which is not desirable despite the many anti-clogging measures that existing releasers are designed with. In addition, the design of the slag scraper cannot well solve the problem of floating slag rising and accumulating. Therefore, a suitable oily wastewater treatment system needs to be explored to realize wastewater reuse.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for efficiently treating and recycling the oily wastewater of a thermal power plant.
In order to achieve the aim, the efficient treatment and recycling system for the oily wastewater of the thermal power plant comprises an oily wastewater inlet pipe, an oil separation tank, a floating oil collector, a recovery oil tank, a vacuum gravity separation chamber, an oil collection chamber, a coalescence separation chamber, a recovery oil tank and a recycling water tank;
the water outlet of the oily wastewater inlet pipe is communicated with the inlet of the oil separation pool, an overwater buoy is arranged in the oil separation pool, the outlet of an oil collecting pipe of the overwater buoy is communicated with the inlet of the floating oil collector, an oil liquid discharge port at the upper part of the floating oil collector is communicated with the inlet of the recovery oil tank, and a wastewater discharge port at the bottom of the floating oil collector is connected with the water inlet of the oil separation pool;
the water outlet of the oil separation tank is communicated with the water inlet of the vacuum gravity separation chamber, the oil outlet of the vacuum gravity separation chamber is communicated with the inlet of the oil collection chamber, the water outlet of the vacuum gravity separation chamber is communicated with the inlet of the coalescence separation chamber, the oil outlet at the top of the coalescence separation chamber is communicated with the inlet of the oil collection chamber, and the outlet of the oil collection chamber is communicated with the inlet of the recovery oil tank;
the bottom water outlet of the coalescence-separation chamber is connected with the inlet of the reuse water tank.
The outlet of the oil collecting pipe of the floating pontoon is communicated with the inlet of the floating oil collector through the oil transfer pump.
The water outlet of the oil separation tank is communicated with the water inlet of the vacuum gravity separation chamber through a lift pump.
The outlet of the oil collecting chamber is communicated with the inlet of the recovery oil tank through the recovery oil pump.
The water outlet at the bottom of the coalescence-separation chamber is connected with the inlet of the reuse water tank through a clean water pump.
The efficient treatment and reuse method of the oily wastewater of the thermal power plant comprises the following steps:
oily wastewater output by an oily wastewater inlet pipe enters an oil separation tank, floating oil is collected through an overwater buoy and then sent into a floating oil collector, oil liquid discharged from the top of the floating oil collector enters a recovery oil tank, and wastewater discharged from the bottom of the floating oil collector enters the oil separation tank;
the water output from the bottom of the oil separation pool enters a vacuum gravity separation chamber for separation, wherein the separated oil enters an oil collection chamber, the separated water enters a coalescence separation chamber for secondary separation and purification, the oil separated from the coalescence separation chamber enters the oil collection chamber, the oil output from the oil collection chamber is sent into a recovery oil tank, and the water separated from the coalescence separation chamber enters a reuse water tank.
The invention has the following beneficial effects:
the system and the method for efficiently treating and recycling the oily wastewater of the thermal power plant have the advantages that when the specific operation is carried out, firstly, the floating oil with the grain diameter of more than or equal to 150 mu m in the oily wastewater is removed by the oil separation tank, floating oil with the density smaller than that of water and larger grain diameter in the oil separation tank floats to the water surface and is collected into a floating oil collector, the impurities with the density higher than that of water are deposited at the bottom of the oil separation tank, the oil separation tank not only has good effect of removing floating oil, but also can remove mechanical impurities with larger grain size in water, then a vacuum gravity separation chamber and a coalescence separation chamber are adopted to remove dispersed oil and emulsified oil with smaller particle size in the oily wastewater, wherein the separated dispersed oil and emulsified oil enter an oil collecting chamber, the oil liquid in the oil collecting chamber enters a recycling oil tank, the separated water enters a recycling water tank, the device realizes the efficient treatment and recycling of the oily wastewater of the thermal power plant, and has the characteristics of small occupied area, low cost and difficult blockage. According to the invention, oily wastewater is subjected to three-stage treatment through the oil separation tank, the vacuum gravity separation chamber and the coalescence separation chamber, the treatment effect of the oily wastewater is effectively improved, the effluent completely meets the requirements specified in the national standard GB8978, the oil content of the effluent is within 2-5 mg/L, the suspended matter is less than or equal to 30mg/L, the effluent meets the water use requirements of systems for coal conveying, ash residue, desulfurization and the like of a power plant, the collected waste oil can be recycled, the system energy consumption is low, the investment and operation cost is low, the treatment effect is stable, the structure is compact, the occupied area is small, and the system has good environmental protection and economic benefits.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is an oil separation tank, 2 is an overwater buoy, 3 is an oil transfer pump, 4 is a floating oil collector, 5 is a lift pump, 6 is a vacuum gravity separation chamber, 7 is an oil collection chamber, 8 is a coalescence separation chamber, 9 is a clean water pump, 10 is a recycling water tank, 11 is a recycling oil pump, and 12 is a recycling oil tank.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for efficiently treating and recycling the oily wastewater of the thermal power plant comprises an incoming pipe of the oily wastewater, an oil separation tank 1, a floating oil collector 4, a vacuum gravity separation chamber 6, an oil collection chamber 7, a coalescence separation chamber 8, a recycling water tank 10 and a recycling oil tank 12; the water outlet of the oily wastewater inlet pipe is communicated with the inlet of the oil separation tank 1, the water floating pontoon 2 is arranged in the oil separation tank 1, the floating oil in the oily wastewater is collected by the water floating pontoon 2, the outlet of the oil collecting pipe of the water floating pontoon 2 is communicated with the inlet of the oil transfer pump 3, the outlet of the oil transfer pump 3 is communicated with the inlet of the floating oil collector 4, the oil liquid discharge port at the upper part of the floating oil collector 4 is communicated with the inlet of the recovery oil tank 12, and the wastewater discharge port at the bottom of the floating oil collector 4 is connected with the water inlet of the oil separation tank 1.
The water outlet of the oil separation tank 1 is communicated with the water inlet of a vacuum gravity separation chamber 6 through a lift pump 5, the oil outlet of the vacuum gravity separation chamber 6 is communicated with the inlet of an oil collection chamber 7, the water outlet of the vacuum gravity separation chamber 6 is communicated with the inlet of a coalescence separation chamber 8, the oil discharge port at the top of the coalescence separation chamber 8 is communicated with the inlet of the oil collection chamber 7, and the outlet of the oil collection chamber 7 is communicated with the inlet of a recovery oil tank 12 through a recovery oil pump 11.
The bottom water outlet of the coalescence separation chamber 8 is connected with the inlet of a reuse water tank 10 through a clean water pump 9, and the outlet water of the reuse water tank 10 is reused to a coal conveying system to be used as the flushing water of spraying and trestle bridges of a coal plant.
The method for efficiently treating and recycling the oily wastewater of the thermal power plant comprises the following steps:
oily waste water that oily waste water inlet pipe exported enters into oil interceptor 1, oil interceptor 1 mainly is used for getting rid of the oil globule that the particle size is more than 150 mu m, the horizontal flow rate control is 2 ~ 5mm/s, the great oil slick of particle size that density is less than water floats to the surface of water, collect the oil slick through buoy 2 on water, send into oil slick collector 4 through petroleum pump 3 again, oil liquid that the oil slick collector 4 upper portion discharged enters into recovery oil tank 12, the waste water that the oil slick collector 4 bottom discharged enters into oil interceptor 1, the oil interceptor section of oil interceptor 1 changes the water flow direction through addding the baffle, thereby improve the effect of getting rid of oil slick.
The water output from the bottom of the oil separation tank 1 enters a vacuum gravity separation chamber 6 through a lift pump 5 for separation, and the vacuum gravity separation chamber 6 mainly adopts the vacuum film theory to break off part of emulsified oil in the wastewater in a vacuum state and accelerate the collection of oil in the oily wastewater to separate the oil from the water. Through set up the high-efficient specific surface separation board subassembly that is formed by the combination of the multi-disc non-stick oil polypropylene buckled plate in vacuum gravity separation chamber 6, under vacuum state, separate the dispersed oil in the oily waste water, explain the separation with the dissolved oil in aqueous simultaneously, the oil that separates gets into oil collecting chamber 7, separates once more in the water that separates gets into coalescence-separation chamber 8 and purifies.
The annular cylinder coalescence filter element formed by improving polymer fiber materials is arranged in the coalescence separation chamber 8, the filter element has good oil-blocking and water-repellent performance, and simultaneously the filter element also plays a certain filtering role for mechanical impurities in water, after the filtration of the filter element, the oil content in the wastewater is less than 5mg/L, and the suspended matters are less than 30 mg/L. When the oily wastewater passes through the coalescence separation chamber 8, tiny oil drops in the water are adsorbed and coalesced on the surface of the filter element and are gradually coalesced into larger oil drops, the oil drops float up to the top of the coalescence separation chamber 8 under the action of gravity and then enter the oil collection chamber 7, the oil output from the oil collection chamber 7 is sent into a recovery oil tank 12 through a recovery oil pump 11, the water discharged from the bottom of the coalescence separation chamber 8 enters a reuse water tank 10 through a clean water pump 9, and the water outlet of the reuse water tank 10 is reused in a coal conveying system and used as the flushing water of a spray and a trestle of a coal plant.
It should be noted that, by adopting the invention, through the three-stage treatment process of the oil separation tank 1, the vacuum gravity separation chamber 6 and the coalescence separation chamber 8, the floating oil, the dispersed oil and the emulsified oil in the oily wastewater can be removed, the treatment effect of the oily wastewater is effectively improved, the adaptability to the fluctuation of the quality of the inlet water is strong, when the oil content of the inlet water is 500-1000 mg/L, the oil content of the outlet water can be controlled within 2-5 mg/L, and the outlet water completely meets the requirements specified in the national standard GB 8978. And suspended impurities in the oily wastewater can be separated in the oil separation tank 1 and the coalescence separation chamber 8, so that the suspended matters in the effluent are ensured to be less than or equal to 30mg/L, and the effluent meets the water requirement of systems for coal conveying, ash residue, desulfurization and the like of a power plant.
The above description is only an example of the implementation steps of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A high-efficiency treatment and recycling system for oily wastewater of a thermal power plant is characterized by comprising an oily wastewater inlet pipe, an oil separation pool (1), a floating oil collector (4), a vacuum gravity separation chamber (6), an oil collection chamber (7), a coalescence separation chamber (8), a recovery oil tank (12) and a recycling water tank (10);
the water outlet of the oily wastewater inlet pipe is communicated with the inlet of the oil separation tank (1), an overwater buoy (2) is arranged in the oil separation tank (1), the outlet of an oil collecting pipe of the overwater buoy (2) is communicated with the inlet of the floating oil collector (4), an oil liquid discharge port at the upper part of the floating oil collector (4) is communicated with the inlet of the recovery oil tank (12), and a wastewater discharge port at the bottom of the floating oil collector (4) is connected with the water inlet of the oil separation tank (1);
the water outlet of the oil separation tank (1) is communicated with the water inlet of the vacuum gravity separation chamber (6), the oil outlet of the vacuum gravity separation chamber (6) is communicated with the inlet of the oil collection chamber (7), the water outlet of the vacuum gravity separation chamber (6) is communicated with the inlet of the coalescence separation chamber (8), the oil discharge port at the top of the coalescence separation chamber (8) is communicated with the inlet of the oil collection chamber (7), and the outlet of the oil collection chamber (7) is communicated with the inlet of the recovery oil tank (12);
the bottom water outlet of the coalescence-separation chamber (8) is connected with the inlet of a reuse water tank (10).
2. The system for efficiently treating and recycling the oily wastewater in the thermal power plant as claimed in claim 1, wherein the outlet of the oil collecting pipe of the water floating pontoon (2) is communicated with the inlet of the floating oil collector (4) through the oil transfer pump (3).
3. The system for efficiently treating and recycling the oily wastewater in the thermal power plant according to claim 1, wherein a water outlet of the oil separation tank (1) is communicated with a water inlet of the vacuum gravity separation chamber (6) through a lift pump (5).
4. The system for efficiently treating and recycling the oily wastewater in the thermal power plant as claimed in claim 1, wherein the outlet of the oil collecting chamber (7) is communicated with the inlet of the recovery oil tank (12) through a recovery oil pump (11).
5. The system for efficiently treating and recycling the oily wastewater in the thermal power plant as claimed in claim 1, wherein a water outlet at the bottom of the coalescence-separation chamber (8) is connected with an inlet of a recycling water tank (10) through a clean water pump (9).
6. A method for efficiently treating and recycling oil-containing wastewater of a thermal power plant is characterized by comprising the following steps:
oily wastewater output by an oily wastewater inlet pipe enters an oil separation tank (1), floating oil is collected through an overwater buoy (2) and then sent into a floating oil collector (4), oil discharged from the top of the floating oil collector (4) enters a recovery oil tank (12), and wastewater discharged from the bottom of the floating oil collector (4) enters the oil separation tank (1);
the water output from the bottom of the oil separation pool (1) enters a vacuum gravity separation chamber (6) for separation, wherein the separated oil enters an oil collection chamber (7), the separated water enters a coalescence separation chamber (8) for secondary separation and purification, the oil separated from the coalescence separation chamber (8) enters the oil collection chamber (7), the oil output from the oil collection chamber (7) is sent into a recovery oil tank (12), and the water separated from the coalescence separation chamber (8) enters a reuse water tank (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011140342.5A CN112142234A (en) | 2020-10-22 | 2020-10-22 | Efficient treatment and recycling system and method for oily wastewater of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011140342.5A CN112142234A (en) | 2020-10-22 | 2020-10-22 | Efficient treatment and recycling system and method for oily wastewater of thermal power plant |
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| CN112142234A true CN112142234A (en) | 2020-12-29 |
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| CN202011140342.5A Pending CN112142234A (en) | 2020-10-22 | 2020-10-22 | Efficient treatment and recycling system and method for oily wastewater of thermal power plant |
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| CN213680158U (en) * | 2020-10-22 | 2021-07-13 | 西安西热水务环保有限公司 | Efficient treatment and recycling system for oily wastewater of thermal power plant |
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2020
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| CN101823798A (en) * | 2010-05-11 | 2010-09-08 | 江苏元宏科技发展有限公司 | Oily water treatment system of hydropower station |
| CN202390263U (en) * | 2011-12-22 | 2012-08-22 | 南京海益环保工程有限公司 | Pressure-type oil-water separator |
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