CN106007209B - A kind of oil refinery's sewage oil removing pretreating process - Google Patents

A kind of oil refinery's sewage oil removing pretreating process Download PDF

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Publication number
CN106007209B
CN106007209B CN201610534564.2A CN201610534564A CN106007209B CN 106007209 B CN106007209 B CN 106007209B CN 201610534564 A CN201610534564 A CN 201610534564A CN 106007209 B CN106007209 B CN 106007209B
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China
Prior art keywords
oil
tank
water
sewage
collecting
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CN106007209A (en
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殷叶龙
杨晓青
陆启亮
殷永政
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Jiangsu Zhongjiahua New Environmental Protection Technology Co., Ltd.
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NANJING RIJIA NEW ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36Nature 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
    • C02F2103/365Nature 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)
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a kind of oil refinery's sewage oil removing pretreating process to separate sandstone and sludge including the collecting-tank with grid;Three-phase rotary filter press floating oil collecting oil extraction adjusts the separation that tank realizes water, oil, slag;Spinning liquid coarse polymerization oil water separator is removed tiny elaioleucite;Demulsification and flocculation reaction occur for dissolved air flotation device, and bubble contacts adherency with the suspended matter in sewage and floats, and reach standard by scraping slag;Present invention process is simple; scientific structure; with " three-phase rotary filter press floating oil collecting oil extraction adjusts tank+spinning liquid coarse and polymerize oil water separator+dissolved air flotation device " for core processing scheme; utilize the density contrast of grease; using fluid dynamics basis mechanism; oily wastewater is pre-processed; physical method and chemical method collective effect; by oil content≤20mg/L in pretreated oily wastewater, reach standard, day output of the present invention is big; oil removal efficiency is high; the waste oil moisture content of recycling is 5% hereinafter, receiving oily significant effect, economic benefits.

Description

A kind of oil refinery's sewage oil removing pretreating process
Technical field
The invention belongs to water-treatment technology field, in particular to a kind of oil refinery's sewage oil removing pretreating process.
Background technique
Sewage after the oil exploitation work different mainly from drilling well, oil recovery, well-flushing, underground work and oil refining, chemical industry etc. Section, the pollutants such as petroleum-type, volatile phenol, sulfide, SS, oil content in the waste water of discharge are contained in the waste water of these workshop sections discharge Up to 10000mg/L or so, suspension content are up to 600mg/L or so, are had exceeded in SY/T5329-94 standard respectively The set quota of (oil-containing≤20-30mg/L, suspension content≤10mg/L), the oily substance in oily waste water swim in the water surface On, thin film is formed, the oxygen in air can be prevented to be dissolved in the water, reduce the dissolved oxygen in water, hinders to swim in water The photosynthesis of object, to influence the self-cleaning of water body.
Sewage treatment at present generally will first carry out pre- oil removing process, and the main processing ways that pre- oil removing is taken are general to wrap Containing physical treatment process and chemical method: chemical method is to be handled by the way of adding demulsifier, flocculant, but such technology cannot reach To ideal deoiling effect, and oil cannot recycle, and particularly with serious sewage is emulsified, only can not achieve by adding demulsifier Demulsification, not can solve root problem, and pre- oil removing does not reach requirement, also causes secondary pollution of water, road sewage after both increasing The processing cost of processing causes centainly to pollute, and causes the waste of resource to environment, physical method include absorption method, film filtering, The methods of electromagnetic adsorption, gas floatation process, Gravity Separation respectively possess some good points but cannot completely control oil content in sewage in 20mg/L Hereinafter, increasing cost and the time of later process, the existing pre- waste-oil scavenger of sewage has been unable to meet production needs, oily wastewater Pretreatment purpose is final emission compliance, there is a large amount of oily substances in sewage, and the raw water of process water is all desalted water, tool There is higher reuse to be worth, sewage and oil therein be recycled, in sewage suspended matter and silt remove, make dirt Water treatment station waste water displacement reaches required standard, meets oil field production needs, can not only save water resource, additionally it is possible to be enterprise Save the cost is improved benefit.
Summary of the invention
To solve the above problems, treated contains the invention discloses a kind of oil refinery's sewage oil removing pretreating process In oily water oil content in 20mg/L hereinafter, subsequent biochemical treatment process section can be directly entered, waste oil moisture content 5% hereinafter, Receive oily significant effect, economic benefits.
In order to achieve the above objectives, technical scheme is as follows:
A kind of oil refinery's sewage oil removing pretreating process, it is characterised in that: the following steps are included:
(1) oily wastewater enters the collecting-tank with grid, isolates sand-mix and sludge;
(2) oily wastewater enters three-phase rotary filter press floating oil collecting oil extraction and adjusts in tank, can adjust inflow, realizes The separation of water, oil, slag, the body refuse isolated in tank are discharged into sludge-tank, and oil slick is discharged into slop tank after collecting, remaining to contain greasy dirt Water enters spinning liquid coarse polymerization oil water separator;
(3) spinning liquid coarse polymerization oil water separator adjusts what tank cannot remove to three-phase rotary filter press floating oil collecting oil extraction Tiny elaioleucite is removed;
(4) oily wastewater enters the front end stirring area of dissolved air flotation device, adds demulsifier, flocculant, by stirring, makes Medicament comes into full contact with the oils in sewage, and demulsification and flocculation reaction occurs, and forms wadding body and is precipitated from water;After stirring Oily wastewater enters the rear end air flotation zone of dissolved air flotation device, and the bubble that release generates is contacted with the small suspended matter in sewage Adherency, under buoyancy, suspended matter floating is separated from water, and so that oil content of wastewater is reached standard by scraping slag;
(5) biochemical system through air-dissolving air-float treated sewage transport to sewage farm carries out biochemical treatment.
Oily wastewater after processing, the main Con trolling index of water quality are as follows: SS≤70mg/l;Petroleum-type≤20mg/l;PH:6-9.
Three-phase rotary filter press floating oil collecting oil extraction described in above-mentioned oil refinery's sewage oil removing pretreating process adjusts tank Outside is equipped with water inlet one, water outlet one, oil outlet one, sand export, and three-phase rotary filter press floating oil collecting oil extraction is adjusted inside tank Equipped with insulating space, three-phase rotary filter press floating oil collecting oil extraction adjusts and is equipped with interlayer between tank and insulating space, in insulating space It is fixed with displacement can, the one communicated drainage tank of water inlet, displacement can lower section is equipped with horn-like water outlet two, displacement can top Equipped with oil-collecting packet one, oil exit pipe is connected below oil-collecting packet one, the oil exit pipe passes through displacement can and connect with oil outlet one, displacement can Lower section is equipped with setting pot, and the setting pot is in inverted conical shape, and setting pot lowest point, which is equipped with, stays sand launder, described that sand launder connection is stayed to shake out Mouthful, the side of the insulating space is equipped with water outlet three, and the water outlet three is connected to the interlayer by exhalant canal, it is described out The height at the mouth of a river three is identical as the lower edge height of oil-collecting packet one.
It is equipped with water inlet two below the spinning liquid coarse polymerization oil water separator, spinning liquid coarse polymerize oil water separator Top is equipped with water outlet four and oil outlet two, and it is separate tank and tank, institute that spinning liquid coarse, which polymerize oil water separator inner part, Stating is separator below separate tank, is oil-removing area above separator, is staggeredly equipped with baffle plate, the baffle plate in the oil-removing area The top is equipped with oil-collecting packet two, and the water inlet two is connected to separator, and the oil-collecting packet two is arranged below oil outlet two, described Water outlet five is equipped between separate tank and tank, the height of the water outlet five and the lower edge height of oil-collecting packet two are identical, Water pump is equipped with below the tank, the water pump connects water outlet four by pipeline.
The dissolved air flotation device side is equipped with water inlet three, and stirring area, air flotation zone, molten is divided into inside dissolved air flotation device Gas tank, water inlet tee joint stirring area, stirring area top are equipped with demulsifier entrance, flocculant entrance, motor, the motor Agitating shaft is connected by transmission case, the agitating shaft is arranged in stirring area, and agitating shaft is equipped with stirring blade, the stirring area It is equipped with water outlet six between air flotation zone, slag-scraper is equipped with above air flotation zone, is equipped with air flue, the gas below the air flotation zone Road is connected to dissolving, and the air flue is equipped with semicircle release, and the release surface is equipped with several ventholes, air flue lower section Equipped with water outlet seven.
The water outlet one connects water inlet two by anti-corrosion pipe, and the water outlet four connects water inlet by anti-corrosion pipe Three.
As an improvement of the present invention, the water inlet one, oil outlet one, sand export, water inlet two, water inlet three, Water outlet seven is equipped with control valve.
As an improvement of the present invention, the three-phase rotary filter press floating oil collecting oil extraction, which is adjusted, enters on the outside of tank equipped with steam Mouthful, the height of the steam inlet is lower than the height of water outlet three.
As an improvement of the present invention, the oil outlet one, sand export be diagonally downward.
As an improvement of the present invention, the water inlet two, the quantity of separator are a for 1-3.
As an improvement of the present invention, the isolation board of vertical direction is equipped in the middle part of the tank bottom surface.
As an improvement of the present invention, the agitating shaft is equipped with two groups of stirring blades.
As an improvement of the present invention, it is poly- to adjust tank, spinning liquid coarse for the three-phase rotary filter press floating oil collecting oil extraction It closes in oil water separator, the inside of dissolved air flotation device and displacement can and is externally provided with erosion resistant coating.
As an improvement of the present invention, the diameter of the venthole is 10-15 μm.
As an improvement of the present invention, the slag-scraper other end is equipped with pressure slag device.
The beneficial effects of the present invention are:
A kind of oil refinery's sewage oil removing pretreating process of the present invention, using the density contrast of grease, using fluid Dynamics basis mechanism, with " three-phase rotary filter press floating oil collecting oil extraction adjusts tank+spinning liquid coarse and polymerize oil water separator+molten gas gas Floating device " is the processing scheme of core, is pre-processed to oily wastewater, and physical method and chemical method collective effect are passed through Oil content≤20mg/L in pretreated oily wastewater, suspension content≤10mg/L, sewage with oil index reach standard, can It is directly entered subsequent biochemical treatment process section, apparatus structure science, simple process, day output is up to 10000m3, oil removing effect Rate improves 70%, and the waste oil moisture content of recycling is 5% hereinafter, receiving oily significant effect, economic benefits.
Three-phase rotary filter press floating oil collecting oil extraction of the present invention adjusts tank, using the structure of tank in tank, to sewage into The preliminary oil removing of row, not only has the function of runoff investigation, but also slow down the impact force of water flow, enables water and oil in quiet environment In be thoroughly layered, realize water, oil, slag separation, with good automatic collecting oil, oil extraction, spoil disposal efficiency;It is isolated in tank Body refuse is discharged into sludge-tank, and oil slick is discharged into slop tank after collecting, and remaining sewage enters oil water separator.
Spinning liquid coarse polymerization oil water separator of the present invention is simple and reasonable, can be to three-phase rotary filter press oil slick The tiny elaioleucite that collecting oil extraction adjusting tank cannot remove is effectively removed, and treatment effeciency is not influenced by oil content variation, Continuous reliability service, spinning liquid coarse it can polymerize oil water separator water outlet stream for a long time and enter dissolved air flotation device.
Dissolved air flotation device of the present invention is directed to remaining a small amount of oil emulsion and dissolved oil in sewage, these oils It is difficult to remove by simple physics mode, demulsifier, flocculant need to be added in stirring area, by mechanical in dissolved air flotation device Stirring action comes into full contact with medicament with the oils in sewage, and demulsification and flocculation reaction occurs, and produces wadding body, is precipitated from water, Enter air flotation zone by the oily wastewater that dosing is reacted, the small suspended matter in a large amount of micro-bubbles and sewage that release generates Contact adherency is made suspended matter float and be separated from water, is cleared up by slag-scraper, sewage due to the buoyancy that micro-bubble generates It is purified, through air-dissolving air-float, treated that sewage meets biochemical system wants to petroleum-type index (petroleum-type≤20mg/L) It asks, the biochemical system that can be fed directly to on-site sewage farm carries out biochemical treatment.
Treatment effect analytical table
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is that three phase separation of the present invention adjusts tank schematic diagram.
Fig. 3 is oil water separator schematic diagram of the present invention.
Fig. 4 is reactor tank schematic diagram of the present invention.
Reference signs list:
1, the oil extraction of three-phase rotary filter press floating oil collecting adjusts tank, 2, spinning liquid coarse polymerization oil water separator, 3, molten gas gas Floating device, 4, displacement can, 5, stirring area, 6, air flotation zone, 7, dissolving, 8, water inlet one, 9, insulating space, 10, water inlet three, 11, oil-collecting packet one, 12, water outlet two, 13, oil exit pipe, 14, oil outlet one, 15, setting pot, 16, stay sand launder, 17, sand export, 18, water outlet three, 19, exhalant canal, 20, interlayer, 21, steam inlet, 22, fixed strip, 23, water outlet one, 24, separate tank, 25, tank, 26, water inlet two, 27, separator, 28, oil-removing area, 29, baffle plate, 30, oil-collecting packet two, 31, oil outlet two, 32, water outlet five, 33, water pump, 34, water outlet four, 35, isolation board, 36, motor, 37, agitating shaft, 38, stirring blade, 39, broken Emulsion entrance, 40, flocculant entrance, 41, water outlet six, 42, slag-scraper, 43, pressure slag device, 44, air flue, 45, release, 46, venthole, 47, water outlet seven, 48, control valve, 49, anti-corrosion pipe.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only For illustrating the present invention rather than limiting the scope of the invention.It should be noted that word " preceding " used in the following description, " rear ", "left", "right", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" refer respectively to direction or remote Direction from geometric center of specific component.
Present invention is generally directed to the oily wastewaters of refinery device discharge to be pre-processed, and the oil content in sewage is controlled In 20mg/L hereinafter, subsequent biochemical treatment process section can be directly entered, processing cost and the time of later process can be reduced, is reduced Cost improves efficiency.
A kind of oil refinery's sewage oil removing pretreating process of the present invention, comprising the following steps:
(1) oily wastewater enters the collecting-tank with grid, isolates sand-mix and sludge;
(2) oily wastewater enters three-phase rotary filter press floating oil collecting oil extraction and adjusts in tank, can adjust inflow, realizes The separation of water, oil, slag, the body refuse isolated in tank are discharged into sludge-tank, and oil slick is discharged into slop tank after collecting, remaining to contain greasy dirt Water enters spinning liquid coarse polymerization oil water separator;
(3) spinning liquid coarse polymerization oil water separator adjusts what tank cannot remove to three-phase rotary filter press floating oil collecting oil extraction Tiny elaioleucite is removed;
(4) oily wastewater enters the front end stirring area of dissolved air flotation device, adds demulsifier, flocculant, by stirring, makes Medicament comes into full contact with the oils in sewage, and demulsification and flocculation reaction occurs, and forms wadding body and is precipitated from water;After stirring Oily wastewater enters the rear end air flotation zone of dissolved air flotation device, and the bubble that release generates is contacted with the small suspended matter in sewage Adherency, under buoyancy, suspended matter floating is separated from water, and so that oil content of wastewater is reached standard by scraping slag;
(5) biochemical system through air-dissolving air-float treated sewage transport to sewage farm carries out biochemical treatment.
Wherein the three-phase rotary filter press floating oil collecting oil extraction adjust be equipped on the outside of tank 1 water inlet 1, water outlet 1, Oil outlet 1, sand export 17, three-phase rotary filter press floating oil collecting oil extraction, which is adjusted, is equipped with insulating space 9, three-phase spinning liquid inside tank 1 It separates floating oil collecting oil extraction to adjust equipped with interlayer 20 between tank 1 and insulating space 9, insulating space is interior to pass through the fixed row of fixed strip 22 Water pot 4, the one 8 communicated drainage tank 4 of water inlet are equipped with horn-like water outlet 2 12,4 top of displacement can below displacement can 4 Equipped with oil-collecting packet 1, one 11 lower section of oil-collecting packet connects oil exit pipe 13, and the oil exit pipe 13 passes through displacement can 4 and oil outlet 1 It connects, setting pot 15 is equipped with below displacement can 4, the setting pot 15 is in inverted conical shape, and 15 lowest point of setting pot is equipped with and stays sand launder 16, described that sand launder 16 is stayed to connect sand export 17, the side of the insulating space 9 is equipped with water outlet 3 18, the water outlet 3 18 The interlayer 20, the height and the lower edge height phase of oil-collecting packet 1 of the water outlet 3 18 are connected to by exhalant canal 19 Together.
Oily wastewater enters displacement can 4 from water inlet 1, is discharged from horn-like water outlet 2 12, utilizes centrifugal force Effect makes waterpower rotary filter press, and separating effect is tens times of settle and separate and inclined plate separation, can greatly improve adjusting tank Homogeneous regulating effect, oily wastewater, which enters in insulating space 9, can produce secondary rising liquid, using oil density it is small float to every Top from space 9, since the height of water outlet 3 18 and the lower edge height of oil-collecting packet 1 are identical, the oil slick of top is collected Oil packet 1 absorbs, and oil is drained into external sump oil collecting tank by oil exit pipe 13;Sewage passes through exhalant canal from water outlet 3 18 19 flow into interlayer 20, and three-phase rotary filter press floating oil collecting oil extraction of the present invention adjusts tank, using the structure of tank in tank, to dirt Water carries out preliminary oil removing, not only has the function of runoff investigation, but also slow down the impact force of water flow, enables water with oil quiet It is thoroughly layered in environment, realizes the separation of water, oil, slag, there is the efficiency of good automatic collecting oil, oil extraction, spoil disposal;Separation in tank Body refuse out is discharged into sludge-tank, and oil slick is discharged into slop tank after collecting, and remaining sewage enters spinning liquid coarse godied oil moisture From device, three-phase rotary filter press floating oil collecting oil extraction of the present invention adjusts tank 1 and collects oily wastewater adjusting, homogeneous and oil-water cyclone Separation, oil slick is collected automatically and the functions such as tapered shaped can bottom water power spoil disposal are integrated, instead of traditional wastewater processing, especially oil-containing The biggish homogeneous pond of land occupation of higher oil refining sewerage coagulation system and the sloping plate oil separation tank that oil removal efficiency is low are measured, not only It solves the face homogeneous Chi Chi and receives oily problem, simplify bottom of pond spoil disposal and the loaded down with trivial details operating procedure such as need whole pond stoppage in transit, water-break, empty, And preferably solve the problems, such as that sloping plate oil separation tank inclined plate body oil-resistant characteristic is poor, easily stains.
The solid formation (oily sludge, silt) to be settled down is deposited in the staying in sand launder 16 of 15 lowest point of setting pot, can Manual hand manipulation's valve can be discharged at any time using the effect of hydraulic pressure.(or by the automatic periodically discharge of control valve 48, Per tour is asked to open primary).
Three-phase rotary filter press floating oil collecting oil extraction, which is adjusted, is equipped with steam inlet 21, the height of the steam inlet 21 on the outside of tank 1 Degree is lower than the height of water outlet 3 18, can input hot steam at low temperature (winter), promote the layering of oily wastewater.
The present invention can be adjusted in three-phase rotary filter press floating oil collecting oil extraction adds grid pond, grid and water flow before tank 1 It is formed and is less than 45° angle, because of the formation of baffling, can be separated thickness is less than many dirts in grid gap;It is logical Grid integration salvaging, conveying are crossed, compression processing saves occupied area, additionally it is possible to reduce the subsequent processes expense of rubbish With.
Water inlet 2 26, the polymerization of spinning liquid coarse are equipped with below spinning liquid coarse polymerization oil water separator 2 of the present invention It is equipped with water outlet 4 34 and oil outlet 2 31 above oil water separator 2, is divided into point inside spinning liquid coarse polymerization oil water separator 2 It is separator 27 below the separate tank 24 from pond 24 and tank 25, is oil-removing area 28, the oil-removing area above separator 27 Baffle plate 29 is staggeredly equipped in 28,29 the top of baffle plate is equipped with oil-collecting packet 2 30, the connection of water inlet 2 26 separation Device 27, the oil-collecting packet 2 30 are arranged below oil outlet 2 31, and water outlet is equipped between the separate tank 24 and tank 25 5 32, the height of the water outlet 5 32 and the lower edge height of oil-collecting packet 2 30 are identical, and water is equipped with below the tank 25 Pump 33, the water pump 33 connect water outlet 4 34 by pipeline.
The present invention in order to guarantee liquid stream in equipment can water distribution uniformity, laminar flow, do not form liquid stream dead zone, intake from below, To ensure that waste water consistently forms laminar condition in equipment, the separator 27 uses the compounded coarse of multi-layer helical net It polymerize filter core element and fine coarse polymerize filter core element, adds baffle plate 29 and oil-collecting packet 2 30, it is (big to tiny elaioleucite In 20 μm) polymerize after separate again, do not influenced by suspended material obstruction in sewage, oil is siphoned away by oil-collecting packet 2 30, remaining Sewage by water outlet 5 32 flow into tank 25, in order to which elaioleucite is stayed in spinning liquid coarse godied oil moisture to greatest extent From in device 2, water pump 33 is arranged below tank 25, is as far as possible taken the sewage of not oil-containing away, baffle plate of the present invention The 29 stainless steel W type corrugated platings made of compacting, oily wastewater make liquid realize laminar flow after tortuous runner Achieve the purpose that water distribution uniformity simultaneously, increase drainage flow distance, shortens elaioleucite floating distance, increase the polymerization probability of oil droplet, Grease is accelerated to polymerize the isolated time, it can be ensured that the stabilization of later separation effect.
Superpressure automatic protection, temperature display is also mounted in spinning liquid coarse polymerization oil water separator 2, liquid level is shown automatically Show, safeguard protections valve and the instrument such as steam backwash, guarantee equipment can stable operation reliably and with long-term, realize unattended automatic Change.
3 side of reactor tank of the present invention is equipped with water inlet 3 10, and stirring area 5, air flotation zone 6, molten is divided into inside reactor tank Gas tank 7, the water inlet 3 10 are connected to stirring area 5, are equipped with demulsifier entrance 39, flocculant entrance 40, motor above stirring area 5 36, the motor 36 connects agitating shaft 37 by transmission case, and the agitating shaft 37 is arranged in stirring area 5, sets on agitating shaft 37 There is stirring blade 38, water outlet 6 41 be equipped between the stirring area 5 and air flotation zone 6, is equipped with slag-scraper 42 above air flotation zone, Air flue 44 is equipped with below the air flotation zone, the air flue is connected to dissolving 7, and the air flue is equipped with semicircle release 45, institute It states 45 surface of release and is equipped with several ventholes 46, be equipped with water outlet 7 47 below air flue 44.
Dissolved air flotation device 3 of the present invention is directed to remaining a small amount of oil emulsion and dissolved oil in sewage, these oil Class is difficult to remove by simple physics mode, is added demulsifier, flocculant in stirring area, is made by mechanical stirring in reactor tank With, come into full contact with medicament with the oils in sewage, occur demulsification and flocculation reaction, produce wadding body, be precipitated from water, by adding The oily wastewater of medicine reaction enters air flotation zone 6, and a large amount of micro-bubbles that release 45 generates connect with the small suspended matter in sewage Touching adherency is made suspended matter float and be separated from water, is cleared up by slag-scraper 42, sewage due to the buoyancy that micro-bubble generates It is purified, through air-dissolving air-float, treated that sewage meets biochemical system wants to petroleum-type index (petroleum-type≤20mg/L) It asks, the biochemical system that can be fed directly to on-site sewage farm carries out biochemical treatment.
Dissolved air flotation device 3 of the present invention uses microbubble generation, subsurface trapping, lamina flow principle, multistage sequence The technologies such as batch coagulation, dross circular flocculation, efficiently separate the suspended matter in sewage;Wherein molten gas, sewage, medicament three are in gas Floating region 6 generates and is suitble to " gas enclosure bubble wadding body " of the air bearing specific gravity less than 1, and under the action of buoyancy, " gas enclosure bubble wadding body " is risen to Liquid level forms dross and completes to be separated by solid-liquid separation.
It is atomized dissolved air from 46 high speed exit flow of venthole, flow velocity reaches 15m/s, and molten gas efficiency is up to 99%;Venthole Diameter be 10-15 μm, formed micro-bubble group, high-efficient, no blocking, easy to maintain;Release is made of plastic material, It is corrosion-resistant suitable for different sewage, long service life;Water outlet 1 of the present invention connects water inlet by anti-corrosion pipe 49 2 26, the water outlet 4 34 connects water inlet 3 10 by anti-corrosion pipe 49, extends service life, stable effluent quality.
Oil content is in 800mg/L before treatment for oily wastewater of the present invention, and oil content is 800mg/L after collecting-tank, Adjusting oil content after tank 1 is handled by three-phase rotary filter press floating oil collecting oil extraction is 200mg/L, by spinning liquid coarse godied oil Separator 2 processing after oil content be 50mg/L, by dissolved air flotation device 3 processing after oil content be 10-20mg/L, this hair Technologically advanced, process, treatment facility efficient operation are managed in daylight, and sewage effluent water stabilization reaches design requirement;Using dress Setting, closure and the higher equipment of the degree of automation simplify operating procedure, improve operating environment;And pollution control and useless Object comprehensive utilization combines, and utmostly waste oil recovery, reduction operating cost improve economical while cutting down pollutant emission Benefit.
Water inlet 1 of the present invention, oil outlet 1, sand export 17, water inlet 2 26, water inlet 3 10, water outlet 7 47 are equipped with control valve 48, can control flow as the case may be.
Diagonally downward, the angle with horizontal direction is 20-30 ° for oil outlet 1 of the present invention, sand export 17, fuel-displaced, Gravity and pressure are utilized when shaking out, discharge rapidly, reduces power output.
Water inlet 2 26 of the present invention, separator 27 quantity be 1-3, can accelerate to improve efficiency except speed oil.
It is equipped with the isolation board 35 of vertical direction in the middle part of 25 bottom surface of tank of the present invention, increases by one of oil-isolating device, and And slow down the trickling impact force of sewage, separate water preferably with oil.
Agitating shaft 37 of the present invention is equipped with two groups of stirring blades 38, improves the reaction speed of medicament and sewage.
Three-phase rotary filter press floating oil collecting oil extraction of the present invention adjusts tank 1, spinning liquid coarse polymerize oil water separator 2, It is externally provided with erosion resistant coating in the inside of dissolved air flotation device 3 and displacement can 4, extends service life, guarantees stable effluent quality.
42 other end of slag-scraper of the present invention is equipped with pressure slag device 43, and the dregs of fat and flocculate collection are put together, are convenient for It is delivered to down the processing place to process.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes Technical solution consisting of any combination of the above technical features.

Claims (8)

1. a kind of oil refinery's sewage oil removing pretreating process, it is characterised in that: the following steps are included:
(1) oily wastewater enters the collecting-tank with grid, isolates sand-mix and sludge;
(2) oily wastewater enters three-phase rotary filter press floating oil collecting oil extraction and adjusts in tank, can adjust inflow, realize water, oil, The separation of slag, the body refuse isolated in tank are discharged into sludge-tank, and oil slick is discharged into slop tank after collecting, and remaining oily wastewater enters Spinning liquid coarse polymerize oil water separator;
(3) spinning liquid coarse polymerization oil water separator cannot remove three-phase rotary filter press floating oil collecting oil extraction adjusting tank tiny Elaioleucite is removed;
(4) oily wastewater enters the front end stirring area of dissolved air flotation device, adds demulsifier, flocculant, by stirring, makes medicament It is come into full contact with the oils in sewage, demulsification and flocculation reaction occurs, formed wadding body and be precipitated from water;Oil-containing after stirring Sewage enters the rear end air flotation zone of dissolved air flotation device, and the bubble that release generates contacts viscous with the small suspended matter in sewage Attached, under buoyancy, suspended matter floating is separated from water, and so that oil content of wastewater is reached standard by scraping slag;
(5) biochemical system through air-dissolving air-float treated sewage transport to sewage farm carries out biochemical treatment;
Step (2) the three-phase rotary filter press floating oil collecting oil extraction, which is adjusted, is equipped with water inlet one, water outlet one, oil outlet on the outside of tank One, sand export, three-phase rotary filter press floating oil collecting oil extraction, which is adjusted, is equipped with insulating space, three-phase rotary filter press floating oil collecting inside tank Oil extraction adjusts and is equipped with interlayer between tank and insulating space, is fixed with displacement can, one communicated drainage of water inlet in insulating space Tank, displacement can lower section are equipped with horn-like water outlet two, oil-collecting packet one are equipped with above displacement can, connects oil extraction below oil-collecting packet one Pipe, the oil exit pipe pass through displacement can and connect with oil outlet one, and setting pot is equipped with below displacement can, and the setting pot is in inverted cone Shape, setting pot lowest point, which is equipped with, stays sand launder, described that sand launder is stayed to connect sand export, and the side of the insulating space is equipped with water outlet Three, the water outlet three is connected to the interlayer, the height of the water outlet three and the lower edge of oil-collecting packet one by exhalant canal It is highly identical;
Water inlet two, spinning liquid coarse godied oil moisture are equipped with below step (3) the spinning liquid coarse polymerization oil water separator From water outlet four and oil outlet two is equipped with above device, it is separate tank and water storage that spinning liquid coarse, which polymerize oil water separator inner part, Pond, the separate tank lower section are separator, are oil-removing area above separator, are interlocked in the oil-removing area equipped with baffle plate, described Baffle plate the top is equipped with oil-collecting packet two, and the water inlet two is connected to separator, and the oil-collecting packet two is arranged under oil outlet two Side, is equipped with water outlet five between the separate tank and tank, the height of the water outlet five and the lower edge of oil-collecting packet two are high It spends identical, water pump is equipped with below the tank, the water pump passes through pipeline connection water outlet four.
2. a kind of oil refinery's sewage oil removing pretreating process according to claim 1, it is characterised in that: the molten gas gas Floating device side is equipped with water inlet three, is divided into stirring area, air flotation zone, dissolving, the water inlet three inside dissolved air flotation device It is connected to stirring area, demulsifier entrance, flocculant entrance, motor are equipped with above stirring area, the motor is stirred by transmission case connection Axis is mixed, the agitating shaft is arranged in stirring area, and agitating shaft is equipped with stirring blade, is equipped between the stirring area and air flotation zone Water outlet six, air flotation zone top are equipped with slag-scraper, air flue are equipped with below the air flotation zone, and the air flue is connected to dissolving, institute It states air flue and is equipped with semicircle release, the release surface is equipped with several ventholes, is equipped with water outlet seven below air flue.
3. a kind of oil refinery's sewage oil removing pretreating process according to claim 1, it is characterised in that: the three-phase rotation Liquid separates floating oil collecting oil extraction and adjusts equipped with steam inlet on the outside of tank, and the height of the steam inlet is lower than the height of water outlet three Degree.
4. a kind of oil refinery's sewage oil removing pretreating process according to claim 1, it is characterised in that: the oil outlet One, sand export is diagonally downward.
5. a kind of oil refinery's sewage oil removing pretreating process according to claim 1, it is characterised in that: the tank The isolation board of vertical direction is equipped in the middle part of bottom surface.
6. a kind of oil refinery's sewage oil removing pretreating process according to claim 1, it is characterised in that: the three-phase rotation Liquid separates floating oil collecting oil extraction and adjusts tank, spinning liquid coarse polymerization oil water separator, the inside of dissolved air flotation device and draining Erosion resistant coating is externally provided in tank.
7. a kind of oil refinery's sewage oil removing pretreating process according to claim 2, it is characterised in that: the venthole Diameter be 10-15 μm.
8. a kind of oil refinery's sewage oil removing pretreating process according to claim 2, it is characterised in that: described to scrape slag dress It sets the other end and is equipped with pressure slag device.
CN201610534564.2A 2016-07-08 2016-07-08 A kind of oil refinery's sewage oil removing pretreating process Active CN106007209B (en)

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