CN110183039A - A kind of oil gas field is drilled the combined treatment process and system of well complexity waste water - Google Patents
A kind of oil gas field is drilled the combined treatment process and system of well complexity waste water Download PDFInfo
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- CN110183039A CN110183039A CN201910437640.1A CN201910437640A CN110183039A CN 110183039 A CN110183039 A CN 110183039A CN 201910437640 A CN201910437640 A CN 201910437640A CN 110183039 A CN110183039 A CN 110183039A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000011282 treatment Methods 0.000 title claims abstract description 56
- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000001704 evaporation Methods 0.000 claims abstract description 36
- 238000010612 desalination reaction Methods 0.000 claims abstract description 35
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- 238000012545 processing Methods 0.000 claims abstract description 25
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- 238000004065 wastewater treatment Methods 0.000 claims abstract description 10
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000839 emulsion Substances 0.000 claims abstract description 7
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 7
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- 238000001223 reverse osmosis Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 10
- 238000005188 flotation Methods 0.000 claims description 9
- 239000008400 supply water Substances 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 6
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- 244000005700 microbiome Species 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
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- -1 Silt Substances 0.000 claims description 3
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical class Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 3
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 159000000007 calcium salts Chemical class 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000008235 industrial water Substances 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 159000000000 sodium salts Chemical class 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
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- 238000011284 combination treatment Methods 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000009835 boiling Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 47
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- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The present invention relates to the combined treatment process that a kind of oil gas field is drilled well complexity waste water, comprising the following steps: waste water is mixed well oil removal removal oil slick；Hardness caused by lime softening removal magnesium ion and calcium ion；Air-dissolving air-float removes oil emulsion and suspended solid in water removal；Air bearing water outlet enters evaporation desalination unit and is evaporated desalination；It evaporates desalination water outlet and enters MBR unit progress biochemical treatment, water outlet is discharged when reaching GB8978-1996 standard and GB18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one A standard.The present invention also provides the composite processing systems that oil gas field is drilled well complexity waste water.Combined treatment process of the present invention and system, which solve in using mechanical and heating power evaporation process more boiling point COD waste water water with high salt that give up, the COD of low boiling point (less than 95 DEG C) is difficult to the problem of being removed in waste water.
Description
Technical field
The invention belongs to petroleum to be drilled well Technology of Sewage field, in particular to a kind of oil gas field is drilled the group of well complexity waste water
Close treatment process and system.
Background technique
It is a kind of very special industry dirt generated in petroleum, gas exploitation course that oil gas field, which is drilled well waste water,
Water.The high organic content of such waste water, coloration is big, high salt, containing suspended material heavy metal etc., to environmental disruption degree pole
Greatly, and each developing zone is different, and the content fluctuation containing pollution factor greatly, is opened so that it becomes always restriction oil gas field
The problem that hair progress is blended with environment.Currently used such sewage disposal technology is to mix well oil removal+chemical oxidation+gas
Floating+reverse osmosis (SRO) group technology of super-pressure.The basic ideas of this technique, which include: 1, mix well oil removal technique plays stabilizing water quality
Tentatively remove oil slick in water removal；2, chemical oxidation process reduces COD in water；3, air-float technology mainly go water removal in oil emulsion and other
Suspended material；4, reverse osmosis (SRO) technique of super-pressure reduces salinity in water.The general idea of this technique is for main in waste water
Pollutant take first removal COD again desalination assist other facilities to remove other polluters such as oil-containing.This technique is whole
Thinking is that first removal COD removes desalination again for major pollutants selection in water.This technique has the disadvantage that: selection chemical method is thrown
Enter oxidating chemicals to aoxidize reducing substances in sewage, salt content in water is caused to increase considerably, increases subsequent except salt worker
The difficulty of skill consumes a large amount of medicament.Reverse osmosis (SRO) the technique desalination of super-pressure is selected, due to this technological basis sewage
The height of middle saliferous is targeted to reverse osmosis pressure design requirement, and such sewage salt content fluctuation is larger, causes to produce water water
It is unstable.In addition, the total system pipeline of this technique is easy to happen blocking, corrosion etc..
Summary of the invention
In view of this, the main purpose of the present invention is to provide the combined treatment works that a kind of oil gas field is drilled well complexity waste water
Skill and system, to effectively remove all kinds of pollution factors.
The object of the invention to solve the technical problems adopts the following technical solutions to realize.
A kind of oil gas field is drilled the combined treatment process of well complexity waste water, comprising the following steps:
1) waste water is mixed well oil removal removal oil slick；
2) lime softening removes hardness caused by magnesium ion and calcium ion；
3) air-dissolving air-float removes oil emulsion and suspended solid in water removal；
4) air bearing water outlet is evaporated desalination into evaporation desalination unit；
5) water outlet of evaporation desalination enters MBR unit progress biochemical treatment, and water outlet reaches the level-one mark of GB8978-1996 standard
Discharge or reuse when quasi- and GB18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one A standard.
Preferably, wherein the combined treatment process further includes insurance and reuse step, the guarantor after step 5)
Danger and reuse step are reverse osmosis treatment, may existing nothing when stopping abovementioned steps and system if there is failure system
Machine salt, so that effluent index is better than People's Republic of China (PRC) GB18918-2002 " urban wastewater treatment firm pollutant emission standard "
Level-one A standard.
Preferably, wherein in step 1), described to mix well oil removal and specifically include: sewage initially enters the equal Hengshui of equalization basin
Matter, residence time 10h；Enter oil separator later and remove oil slick, stops 2h.
Preferably, the oil slick includes alkane, cycloalkane and aromatic hydrocarbons wherein in step 1), relative density is less than
1.0。
Preferably, the lime softening is added using two steps wherein in step 2), calcium hydroxide is first added and removes magnesium ion
Caused hardness adds sodium carbonate and removes hardness caused by deliming, the final index≤500mg/l of hardness.
Preferably, the grain partial size of the oil emulsion is between 0.5-25 μm wherein in step 3).
Wherein in step 3), the suspended solid includes inorganic matter not soluble in water, organic matter, silt, clay and micro- life
Object.
Preferably, it is 10wt%- that the air-dissolving air-float, which is additionally added concentration in water inlet, wherein in step 3)
The technical grade polymeric aluminum chlorides solution of 20wt%, dosage 200-300ppm；The dissolved air water water of the air-dissolving air-float is dirt
The 20~30% of water, effluent index oil-containing≤20mg/l, suspended solid index≤10mg/l, the residence time 20 minutes.
Preferably, wherein in step 4), the water inlet pH value of the evaporation desalination unit is 6-9, hardness number≤
500mg/l, fluorine ion are less than 5ppm, oil≤20mg/l, suspended solid index≤10mg/l；Recirculated cooling water pressure of supply water >=
0.3Mpa, supply water temperature≤32 DEG C, industrial water pressure of supply water >=0.35Mpa, the power supply of the evaporation desalination unit is using low
Voltage source 380V ± 7%, AC three-phase five-wire system neutral-point solid ground, frequency 50HZ ± 0.5HZ；The evaporation desalination unit
Water outlet in addition to COD index other indexs reach outer draining GB8978-1996 standard primary standard；The salt includes sodium salt, calcium
Salt and sylvite.
Preferably, the dissolved oxygen of the anoxic zones of the MBR unit is 0.2-0.5mg/L wherein in step 5), it is good to support
The dissolved oxygen in region be 2-4mg/L, 32-36 DEG C of water temperature, pH value 6-9.
Preferably, wherein the operation of above-mentioned steps is controlled by PLC.
A kind of oil gas field is drilled the composite processing system of well complexity waste water, for implementing above-mentioned technique, including via pipe
Road sequential concatenation mixes well oil removal unit, except hardness unit, air flotation cell, evaporation desalination unit and MBR unit, and each unit is independent
It is integral to be fixed on shape on steel structure frame.
Preferably, wherein the composite processing system further includes the RO unit being connect by pipeline with MBR unit.
Preferably, wherein the composite processing system further include respectively with mix well oil removal unit, except hardness unit, air bearing
The PLC control unit that unit, evaporation desalination unit, MBR unit and RO unit are connected and be fixed on steel structure frame.
Preferably, mixing well oil removal unit described in wherein includes sequentially connected equalization basin and oil separator.
Preferably, wherein described except hardness unit is sofening treatment tank.
Preferably, wherein the air flotation cell is airfloat equipment.
Preferably, wherein the evaporation desalination unit is horizontal single-action forced-circulation evaporation enrichment facility.
Preferably, wherein the MBR unit is MBR device, the MBR device includes anoxic pond, and the anoxic pond is logical
It crosses its bottom to be connected to aerobic tank, microporous aeration disc is equipped in the aerobic tank, the aerobic tank is connected with membrane cisterna.
Preferably, wherein the RO unit is reverse osmosis unit.
Sewage treatment field copes with such waste water using first except desalination process after COD, the present invention is for main in water at present
Pollutant selects first desalination to remove COD again, desalination (evaporative crystallization) unit and be core procedure except COD unit is used as, and desalination (steams
Hair crystallization) unit is before except COD unit, using the thinking for removing COD after first desalination.
By above-mentioned technical proposal, the present invention is at least had the advantage that
1, combined treatment process of the present invention uses PLC program control, and high degree of automation, all units are all
It realizes skid and is turned into industry, can satisfy the requirement of the flexible operation of oil field environment-protection industry；
2, combined treatment process of the present invention, evaporation are improved and are steamed except salt treatment is by mechanical compression secondary steam
Stripping temperature is heated using the heat of steam generation to waste water in heating tube, and recycling heat energy greatly reduces system energy consumption；
3, combined treatment process of the present invention, by that will evaporate except salt treatment and MBR processing combine, due to steaming
Water is produced after hair at 40 DEG C or so, is conducive to control the temperature in anoxic pond and aerobic tank, is kept biological enzyme in optimum activity situation
Work, to improve treatment effeciency；
4, combined treatment process of the present invention, it is environmental-friendly, without adding a large amount of chemical agents；
5, combined treatment process of the present invention, water can carry out reuse and reach production and life requirement after processing.
6, to solve system front corruption easily occurs for composite processing system of the present invention except hardness unit by increasing
Lose scale problems；
7, composite processing system of the present invention, apparatus adaptability is strong, is adapted to the fluctuation of influent quality；
8, combined treatment process of the present invention and system, which solve with high salt using mechanical and heating power evaporation process
It gives up in more boiling point COD waste water water, the COD of low boiling point (less than 95 DEG C) is difficult to the problem of being removed in waste water.
Detailed description of the invention
Fig. 1 is the composite processing system connection signal that oil gas field described in present pre-ferred embodiments is drilled well complexity waste water
Figure.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
The materials, reagents and the like used in the following examples is commercially available.
Embodiment 1
As shown in Figure 1, the present invention also provides the combined treatment process that a kind of oil gas field is drilled well complexity waste water, it is specific to wrap
Include following steps:
Mix well oil removal: (pH value 5-8, coloration >=500 times, conductivity 40000-60000 μ s/cm mainly include sewage
Machine object, with high salt, suspended material, mineral oil and heavy metal etc., wherein concentration with high salt be 3000-6000mg/L, mineral oil it is dense
Degree is 50-100mg/L, and the concentration of suspended material is 500mg/L or so) initially enter the balanced water quality of equalization basin 11 (do not need plus
Enter any medicament, it is therefore an objective to uniform water quality), residence time 10h；Enter oil separator 12 later and removes oil slick (including alkane, ring
The complex mixture of a variety of hydro carbons such as alkane and aromatic hydrocarbons), relative density stops 2h less than 1.0), and such sewage can achieve
Except the purpose of oil slick, index reaches appearance without oil slick.
Lime softening removes hardness: in except hardness unit 2 (it is specially conventional sofening treatment tank in the present embodiment)
It carries out, sewage uses two steps to add except hardness, and hardness caused by calcium hydroxide removal magnesium ion is added, adds sodium carbonate and goes deliming
Caused hardness (according to hardness height adjustment dosage in raw water), the final index≤500mg/l of hardness.
Air-flotation process: it carries out, adopts in air-flotation process unit 3 (it is specially conventional airfloat equipment in the present embodiment)
The oil emulsion in water removal is gone (about to exist with non-rising noncondensed tiny elaioleucite, partial size existing for stable state with dissolved air flotation
Between 0.5-25 μm, to be filbert to dark brown liquid or semisolid) and suspended solid (SS, including not soluble in water inorganic
Object, organic matter, silt, clay, microorganism etc.)), the residence time 20 minutes；In addition, being to concentration can also be added in water inlet
The technical grade polymeric aluminum chlorides solution of 10wt%-20wt% adjusts dosage according to variation water quality situation at any time, such as with 200-
The dosage of 300ppm is added in sewage, and the control of dissolved air water water is the 20~30% of sewage quantity, and control effluent index is containing emulsification
Oil≤20mg/l, SS index≤10mg/l.
Evaporation desalination: air bearing water outlet enters evaporation desalination unit 4, and (it is specially that horizontal single-action pressure follows in the present embodiment
Ring evaporation concentration device) it is evaporated desalination (including the various inorganic salts of sodium salt, calcium salt, sylvite etc. and the combination of organic salt),
Control water inlet pH value is 6-9, hardness number≤500mg/l, index oil-containing≤20mg/l, SS index≤10mg/l；It is described horizontal
The setup parameter of single-action forced-circulation evaporation enrichment facility is as follows: recirculated cooling water pressure of supply water >=0.3Mpa, and supply water temperature≤
32 DEG C, industrial water pressure of supply water >=0.35Mpa；The power supply of the unit uses low-tension supply 380V ± 7%, five line of AC three-phase
Neutral-point solid ground processed, frequency 50HZ ± 0.5HZ；The contacting material of the horizontal single-action forced-circulation evaporation enrichment facility can
The main material of energy contacting material part is TA2 (commercial titanium, it is not easy to corrode, salt tolerant is relatively high).Using forced circulation technique,
So that material is kept high flow rate (2m/s), this is because high flow rate is not easy to deposit, forms disturbance stream in heat-transfer surface, can also wash away
Heat-transfer surface.The evaporation temperature difference of use is lower (10 DEG C or so), and wherein evaporating temperature control is effectively prevented from and finishes at 92 DEG C or so
The generation of dirt.The horizontal single-action forced-circulation evaporation enrichment facility is configured with online scale suppression device, and the online scale suppression device is with pulse skill
Based on art, the frequency of the signal is propagated by being covered on the pulse band of pipeline；Pulse band interacts two-by-two, forms frequency
The water flow of rate zone convection warp is handled, and special capacitive battery pulse changes the crystallization process of liquid calcium, loses scale attached
Put forth effort；The horizontal single-action forced-circulation evaporation enrichment facility interior design has online doser, by metering pump timing, it is quantitative
It is pumped into suitable antisludging agent (the dedicated barium-strontium antisludging agent in oil field, dosage are 50-100g/ tons of water) in device, inhibits calcium ions and magnesium ions
Enrichment.Automatic rinser group is equipped with inside the horizontal single-action forced-circulation evaporation enrichment facility, the cleaning of evaporator passes through certainly
Instrument automatic running is controlled, the cleaning solution after cleaning is evaporated as waste water, and cleaning residue is filtered out by filter.Configuration is online to be added
Acid adds alkali unit, to remove the fouling body remained in caused heat exchanger tube by calcium ion.Using Large Diameter Pipeline heat exchanger tube (38mm),
Large aperture makes heat exchanger tube be not easy to be blocked；Evaporator continuous operation (considers 8000 hours working times year or more, processing
Water considers that operating space increases the range of decrease 10%), water management other indexs in addition to COD index reach outer draining GB8978-1996 out
The primary standard of standard.
MBR (biomembrane) processing: the process of simulation nature microorganism purification sewage, it is mono- that evaporation desalination water outlet enters MBR
Member 5 carries out biochemical treatment, to decompose COD in water；The MBR unit 5 is specially MBR device in the present embodiment, the MBR dress
It sets and is divided into 3 modules according to function, anoxic pond is arrived in first water inlet first, and anoxic pond is connected to by bottom with aerobic tank, and aerobic tank is adopted
It is aerated with microporous aeration disc, aerobic tank is connected with membrane cisterna (that is, being divided into two different regions in a pond, respectively
Aerobic tank and membrane cisterna), when membrane stack operation in membrane cisterna, has individual aeration tube to be aerated membrane module.Wherein the water of membrane cisterna is logical
It crosses circulating pump and is constantly recycled toward anoxic pond, aerobic microbiological and anaerobe is allowed constantly to be replaced, first is that allowing
It keeps lasting activity, is unlikely to allow the continuous aging of microorganism；Second is that allowing circulating pump that can also play digestive juice reflux
Effect, promotes denitrification, the ammonia nitrogen in treatment fluid is made to resolve into nitrogen and water.In the process of running, suction pump is to film
Inner surface generates a suction, so that treatment fluid is constantly entered the inner surface of film, drains into water storage Huang tank again by suction pump.It is taking out
Film surface is progressively enriched with the higher treatment fluid of concentration during suction, therefore need to be aerated by the aeration tube of bottom first is that being led to
The treatment fluid of higher concentration around a part of diaphragm is taken away during the liter bottom-up for crossing bubble；Second is that diaphragm is caused to shake
It is dynamic, make to be attached to rise after the dirty aleatorium on diaphragm falls off with bubble during be carried over membrane stack.Anoxic zones control dissolution
Oxygen is 0.2-0.5mg/L, and aerobic region controls dissolved oxygen control 2-4mg/L, 32-36 DEG C of water temperature, pH6-9, uses ultrafiltration membrane later
Carry out mud-water separation.Water outlet Con trolling index reaches the primary standard and GB18918-2002 of outer draining GB8978-1996 standard
" urban wastewater treatment firm pollutant emission standard " level-one A standard, can discharge or reuse.
RO film process (reverse osmosis treatment): MBR water outlet can enter RO unit 6, and (it is specially reverse osmosis in the present embodiment
Device) in handled, security personnel and reuse unit using reverse osmosis units as whole system, guarantor of this step as system
Danger and reuse technology, may existing inorganic salts when stopping substance front technique and system if there is failure system.Specifically
Processing step are as follows: switch the valve for needing to run tank, start sand filtration intake pump, observe inlet gage (at sandfiltration pot pipeline)
To 2.5bar or more, start RO intake pump, starting RO system high pressure pump after delay 10 seconds adjusts concentrated water after delay 60 seconds and adjusts
Valve is adjusted to intake pressure to 13bar, into normal operating condition.Stopping process: slowly opening regulating valve and carry out system decompression,
It unloads to pressure to 3bar or so, be delayed 3 minutes stopping high-pressure pumps, and high-pressure pump be delayed 5 seconds stopping RO intake pumps after stopping, and is delayed 5
Second stops sand filtration intake pump, completes outage.Effluent index is better than People's Republic of China (PRC) GB18918-2002 " town sewage
Treatment plant's pollutant emission standard " level-one A standard.
In addition, the operation of present invention process above steps is controlled by PLC.
Firstly, automatic front and back hand-operated valve is shown in a fully open operation in inspection system.
Secondly, automatic start up system step are as follows: switch automatic gear and enter auto state → automatic starting sand filtration intake pump
→ automatic starting RO intake pump → starting RO system high pressure automatically after delay 10 seconds to pump → manually adjusts concentrated water tune after being delayed 60 seconds
Valve is saved, is adjusted to intake pressure to 13bar, into normal operating condition.
Furthermore outage are as follows: open regulating valve manually and carry out system decompression, after pressure is unloaded to 3bar or so, be delayed 3 points
Clock, which is automatically stopped to be delayed 5 seconds after high-pressure pump → high-pressure pump stops, being automatically stopped RO intake pump → stopping sand filtration intake pump of delay 5 seconds,
It completes to shut down.
Embodiment 2
As shown in Figure 1, the present invention provides the composite processing systems that a kind of oil gas field is drilled well complexity waste water, for implementing
Above-mentioned technique, the composite processing system include mixing well oil removal unit 1, except hardness unit 2, air bearing via pipeline sequential concatenation
Unit 3, evaporation desalination unit 4 and MBR unit 5, it is integral that each unit is independently fixed on shape on steel structure frame.It is described to mix well
Oil removal unit 1 includes sequentially connected equalization basin 11 and oil separator 12；The hardness unit 2 that removes is selected from the prior art, specific
Details are not described herein for structure, such as can be conventional sofening treatment tank；The air flotation cell 3 is selected from the prior art, specific
Details are not described herein for structure, such as can be conventional airfloat equipment；The evaporation desalination unit 4 is selected from the prior art, tool
Details are not described herein for body structure, such as can be horizontal single-action forced-circulation evaporation enrichment facility (purchased from the energy conservation of Qingdao Kang Jing brightness
Environmental Protection Technology Co., Ltd)；The MBR unit 5 is selected from the prior art, and details are not described herein for specific structure, such as can be
Conventional MBR device (being purchased from Chengdu Mei Fute film Science and Technology Ltd.), the MBR device may include anoxic pond, the anoxic
Pond can be connected to by its bottom with aerobic tank, and microporous aeration disc can be equipped in the aerobic tank, and the aerobic tank can be connected with film
Pond；Described to state composite processing system preferably and may include RO unit 6, the RO unit 6 is selected from the prior art, specific to tie
Details are not described herein for structure, such as can be for conventional reverse osmosis unit, security personnel and reuse unit as whole system, if
Because technological parameter or plant issue effluent index have small-scale fluctuation, which can guarantee whole the processing system of front
Body standard water discharge.The composite processing system further include respectively with mix well oil removal unit 1, except hardness unit 2, air flotation cell 3, steam
The PLC control unit 7 that hair desalination unit 4, MBR unit 5 and RO unit 6 are connected and be fixed on steel structure frame, to realize control
System automation.
The effect test of the treatment process of the present invention of embodiment 3 and system
In order to verify the effect for the treatment of process and system of the present invention, influent quality under the same conditions, we
It uses on November 1st, 2018 at Iraq's Ai Hadaibu oil field drilling, complete well sewage treatment scene with combination of the present invention
Treatment process and system have carried out test (being shown in Table 1) in one month by a definite date, it is desirable that reach after processing or better than Chinese people's republicanism
State GB18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one A standard, i.e. CODCrEqual to or less than 50mg/L,
Oil concentration is equal to or less than 2mg/L, and ss concentration is equal to or less than 10mg/L, and coloration is equal to or less than 30 times.Wherein, institute of the present invention
Q=4 ton/hours of the design treatment water for the treatment of process is stated, effective hydraulic detention time is 21 hours, remaining process conditions is the same as real
Example 1 is applied, water can be back to industrial process waters and greening after processing.
Table 1
As shown in table 1, by operation in one month, it was demonstrated that treatment process effect of the present invention is preferable, indices
Reach or better than primary standard and the People's Republic of China (PRC) for draining GB8978-1996 standard outside the People's Republic of China (PRC)
GB18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one A standard.And it is environmental-friendly, without adding big quantization
Learn medicament.Through waste water treatment plant's assay, one month by a definite date field test can be seen that influent CODCrAverage out to
5238.5mg/L, the water outlet COD of the treatment processCrAverage out to 12.5mg/L, removal rate 99.76%；Conductivity of intaking is average
For 49671 μ s/cm, the 45.2 μ s/cm of water outlet conductivity average out to of the treatment process；Removal rate is 99.91%；Water inlet oil concentration
Average out to 66mg/L, the water outlet oil concentration average out to 0.0041mg/L of the treatment process, removal rate 99.99%；Ss of intaking is dense
Spend average out to 515mg/L, the water outlet ss concentration average out to 3.23mg/L of the treatment process, removal rate 99.4%；Water inlet coloration
734 times of average out to, 2 times of the effluent color dilution average out to of the treatment process, removal rate 99.7%.
In addition, the effluent quality in above-mentioned 1 day November in 2018 also have passed through locality third party testing agency, Iraq (Al-
Rawabi Al-Khadra Company for Chemical and Environmental Services, Ltd) detection point
Analysis, is shown in Table 2.It can be seen that each detection index from the data of table 2 and be all better than People's Republic of China (PRC) GB18918-2002
" urban wastewater treatment firm pollutant emission standard " level-one A standard.
Table 2
| Index name | Water sample detection result |
| Suspended solid (SS) | — |
| pH | 7.0 |
| COD(Cr2O7) method mg/L | 10 |
| Chloride, Cl-mg/L | 13.6 |
| Sulfate, mg/L | 1.09 |
| Amide, mg/L | — |
| Lead, Pb mg/L | 0.0011 |
| Arsenic, As mg/L | 0.0015 |
| Mercury, Hg mg/L | 0.0013 |
| Chromium, Cr mg/L | 0.0005 |
| Cadmium, Cd mg/L | 0.0009 |
| Total organic matter and its derivative, mg/L | 0.00088 |
| Sulfide mg/L | — |
| Inorganic ammonia mg/L | — |
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (13)
1. the combined treatment process that a kind of oil gas field is drilled well complexity waste water, which comprises the following steps:
1) waste water is mixed well oil removal removal oil slick；
2) lime softening removes hardness caused by magnesium ion and calcium ion；
3) air-dissolving air-float removes oil emulsion and suspended solid in water removal；
4) air bearing water outlet is evaporated desalination into evaporation desalination unit；
5) evaporation desalination water outlet enters MBR unit and carries out biochemical treatment, water outlet reach the primary standard of GB8978-1996 standard with
And discharge or reuse when GB18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one A standard.
2. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that the combination
Treatment process further includes insurance and reuse step after step 5), and the insurance and reuse step are reverse osmosis treatment, to stop
When staying abovementioned steps and system if there is failure system may existing inorganic salts so that effluent index is better than the Chinese people
Republic GB18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one A standard.
3. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that step 1)
In, described to mix well oil removal and specifically include: sewage initially enters equalization basin equilibrium water quality, residence time 10h；Enter oil removal later
Pond removes oil slick, stops 2h.
4. the combined treatment process that oil gas field as claimed in claim 3 is drilled well complexity waste water, which is characterized in that step 1)
In, the oil slick includes alkane, cycloalkane and aromatic hydrocarbons, and relative density is less than 1.0.
5. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that step 2)
In, the lime softening is added using two steps, and hardness caused by calcium hydroxide removal magnesium ion is first added, adds sodium carbonate removal
Hardness caused by calcium, the final index≤500mg/l of hardness.
6. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that step 3)
In, the grain partial size of the oil emulsion is between 0.5-25 μm；The suspended solid include inorganic matter not soluble in water, organic matter,
Silt, clay and microorganism.
7. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that wherein step
3) in, the air-dissolving air-float is additionally added the technical grade polymeric aluminum chlorides solution that concentration is 10wt%-20wt% in water inlet, adds
Amount is 200-300ppm；The dissolved air water water of the air-dissolving air-float is the 20~30% of sewage quantity, effluent index oil-containing≤20mg/
L, suspended solid index≤10mg/l, the residence time 20 minutes.
8. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that step 4)
In, the water inlet pH value of the evaporation desalination unit is 6-9, and hardness number≤500mg/l, fluorine ion is less than 5ppm, oil≤20mg/
L, suspended solid index≤10mg/l；Recirculated cooling water pressure of supply water >=0.3Mpa, supply water temperature≤32 DEG C, industrial water supply water
The power supply of pressure >=0.35Mpa, the evaporation desalination unit uses low-tension supply 380V ± 7%, and AC three-phase five-wire system is neutral
Point is directly grounded, frequency 50HZ ± 0.5HZ；The water outlet of the evaporation desalination unit other indexs in addition to COD index reach outlet
The primary standard of water GB8978-1996 standard；The salt includes sodium salt, calcium salt and sylvite.
9. the combined treatment process that oil gas field as described in claim 1 is drilled well complexity waste water, which is characterized in that step 5)
In, the dissolved oxygen of the anoxic zones of the MBR unit is 0.2-0.5mg/L, and the dissolved oxygen for supporting region well is 2-4mg/L, water temperature
32-36 DEG C, pH value 6-9.
10. a kind of oil gas field is drilled the composite processing system of well complexity waste water, described in any item for implementing claim 1-9
Technique, which is characterized in that including mixing well oil removal unit, except hardness unit, air flotation cell, evaporation remove via pipeline sequential concatenation
Salt unit and MBR unit and RO unit, it is integral that each unit is independently fixed on shape on steel structure frame.
11. composite processing system as claimed in claim 10, which is characterized in that the composite processing system further includes passing through pipe
The RO unit that road is connect with MBR unit.
12. composite processing system as claimed in claim 10, which is characterized in that the composite processing system further include respectively with
Mix well oil removal unit, except hardness unit, air flotation cell, evaporation desalination unit, MBR unit and RO unit connect and are fixed on steel knot
PLC control unit on structure frame；The oil removal unit of mixing well includes sequentially connected equalization basin and oil separator；It is described to remove hardness
Unit is sofening treatment tank；The air flotation cell is airfloat equipment.
13. composite processing system as claimed in claim 10, which is characterized in that the evaporation desalination unit is that horizontal single-action is strong
Circulating and evaporating enrichment facility processed；The MBR unit is MBR device, and the MBR device includes anoxic pond, and the anoxic pond passes through
Its bottom is connected to aerobic tank, and microporous aeration disc is equipped in the aerobic tank, and the aerobic tank is connected with membrane cisterna；The RO unit
For reverse osmosis unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105366868A (en) * | 2015-12-14 | 2016-03-02 | 四川阳森石油技术有限公司 | Up-to-standard discharge treatment technology of drilling wastewater from oil and gas fields |
| CN210340611U (en) * | 2019-05-24 | 2020-04-17 | 安东环保技术有限公司 | Combined treatment system for complex wastewater of drilling and completion of oil and gas field |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105366868A (en) * | 2015-12-14 | 2016-03-02 | 四川阳森石油技术有限公司 | Up-to-standard discharge treatment technology of drilling wastewater from oil and gas fields |
| CN210340611U (en) * | 2019-05-24 | 2020-04-17 | 安东环保技术有限公司 | Combined treatment system for complex wastewater of drilling and completion of oil and gas field |
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