CN110862201B - Gas field water treatment system - Google Patents
Gas field water treatment system Download PDFInfo
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- CN110862201B CN110862201B CN201911403077.2A CN201911403077A CN110862201B CN 110862201 B CN110862201 B CN 110862201B CN 201911403077 A CN201911403077 A CN 201911403077A CN 110862201 B CN110862201 B CN 110862201B
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- 239000003672 gas field water Substances 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 160
- 238000006243 chemical reaction Methods 0.000 claims abstract description 67
- 230000000813 microbial effect Effects 0.000 claims abstract description 51
- 239000012528 membrane Substances 0.000 claims abstract description 29
- 238000005191 phase separation Methods 0.000 claims abstract description 20
- 244000005700 microbiome Species 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000010992 reflux Methods 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 6
- 238000005374 membrane filtration Methods 0.000 claims description 6
- 230000033116 oxidation-reduction process Effects 0.000 claims description 4
- 238000005276 aerator Methods 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000003814 drug Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 51
- 239000011499 joint compound Substances 0.000 description 12
- 239000010865 sewage Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 239000010802 sludge Substances 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000588986 Alcaligenes Species 0.000 description 1
- 244000063299 Bacillus subtilis Species 0.000 description 1
- 235000014469 Bacillus subtilis Nutrition 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000187654 Nocardia Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 241000589516 Pseudomonas Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
-
- 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
- C02F2209/04—Oxidation reduction potential [ORP]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a gas field water treatment system, which comprises an oil-mud-water three-phase separation device, a microbial reaction tank, a tubular membrane filtering device and a water outlet tank, wherein a water outlet of the oil-mud-water three-phase separation device is communicated with a water inlet of the microbial reaction tank through a middle pipeline, and a water outlet of the microbial reaction tank is communicated with the tubular membrane filtering device through a water outlet pipeline; the concentrated water outlet of the tubular membrane filter device is communicated with the microorganism reaction tank through a concentrated water pipeline, a concentrated water branch pipe is arranged on the concentrated water pipeline, the concentrated water branch pipe is communicated with the water outlet pipeline to form a reflux pipeline of the tubular membrane filter device, and the clear water outlet of the tubular membrane filter device is communicated with the water outlet tank through a clear water pipeline. The system of the invention omits the traditional filter, has no filter material replacement and dangerous waste treatment, the device system does not need adding medicine, the water quality is not modified, and the effluent water quality is stable and superior to the gas field water reinjection standard.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a gas field water treatment system.
Background
In the oil-containing gas basin, the water-containing rock system undergoes geological development changes such as deposition, shallow burying, deep burying, deterioration, leaching and the like, so that active ion exchange action between oil, water and gas occurs, the chemical property of reservoir water changes, and new water quality containing special chemical components is formed. It has high salt content, mineralization degree of tens of thousands to hundreds of thousands mg/L, some as high as millions mg/L. The water contains potassium, sodium, calcium, magnesium, etc. ions, iodine, boron, etc. Besides, the oil-water separator also contains a large amount of suspended matters, oil, sulfides, oilfield chemical additives and other organic matters. Such as drilling fluids, fracturing fluids, etc., that penetrate into the formation during drilling, and may also include some corrosive materials, such as those produced by corrosion of pipes, equipment, etc. Therefore, before entering the reinjection well, impurities in the stratum water need to be cleaned so as to keep the reinjection well clear and ensure reinjection performance.
Disclosure of Invention
The invention aims to provide a gas field water treatment system.
The invention has the innovation points that the system omits the traditional filter, has no filter material replacement and dangerous waste treatment, the device system does not need adding medicine, the water quality is not modified, and the outlet water quality is stable and superior to the gas field water reinjection standard.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a gas field water treatment system comprises an oil, mud and water three-phase separation device, a microbial reaction tank, a tubular membrane filtration device and a water outlet tank; the oil, mud and water three-phase separation device comprises a cylinder body, wherein three inner cylinder bodies are arranged in the cylinder body, and the three inner cylinder bodies are respectively a first inner cylinder body, a second inner cylinder body and a third inner cylinder body from outside to inside; the bottoms of the first inner cylinder, the second inner cylinder and the third inner cylinder are conical and are provided with openings at the bottoms; the outer wall of the upper part of the third inner cylinder body is wrapped with a fourth inner cylinder body, the first inner cylinder body and the second inner cylinder body share a top wall, the first inner cylinder body and the second inner cylinder body are higher than the third inner cylinder body in height and lower than the fourth inner cylinder body in height, the fourth inner cylinder body is higher than the third inner cylinder body in bottom and fixedly connected to the outer wall of the third inner cylinder body, a supporting rod is welded at the top of the fourth inner cylinder body, a supporting shaft is connected to the supporting rod and located at the center of the cylinder body, two conical hoppers are arranged on the supporting shaft, a ring-shaped guide plate bent inwards is arranged at the top edge of each conical hopper, the ring-shaped guide plate is obliquely arranged, the joint of each annular guide plate and each conical hopper is a low point, each conical hopper is divided into an upper conical hopper and a lower conical hopper, the bottom of each lower conical hopper is slightly higher than the bottom of the first inner cylinder body, a cannula inserted into the lower conical hopper is arranged at an opening of the bottom of the second inner cylinder body, and the bottom of each inner cylinder body is inserted into the upper conical hopper; the inner wall of the first inner cylinder body is provided with two circles of baffles which are divided into an upper baffle and a lower baffle, the height of the upper baffle is slightly higher than that of the upper conical hopper, the height of the lower baffle is slightly higher than that of the lower conical hopper, the inner diameter of the upper baffle is smaller than the maximum diameter of the upper conical hopper and slightly larger than the inner diameter of the annular guide plate of the upper conical hopper, and the inner diameter of the lower baffle is smaller than the maximum diameter of the lower conical hopper and slightly larger than the inner diameter of the annular guide plate of the upper conical hopper; the side wall of the cylinder body is provided with a water inlet, a water outlet and an oil drain opening, the highest point of the water inlet is higher than the top of the first inner cylinder body, the lowest point of the water inlet is lower than the top of the first inner cylinder body, the water outlet and the oil drain opening are slightly lower than the water inlet, the side wall of the bottom of the cylinder body is provided with a slag discharge opening, the side wall of the fourth inner cylinder body is provided with an inner water outlet, the side wall of the second inner cylinder body is provided with an inner oil drain opening, the height of the inner oil drain opening is higher than the height of the upper baffle, the water outlet is communicated with the inner water outlet through the first inner cylinder body and the second inner cylinder body, the oil drain pipe is communicated with the inner oil drain opening through the first inner cylinder body, the water drain pipe and the oil drain pipe are both fixed on the side wall of the cylinder body, the first inner cylinder body and the second inner cylinder body are supported by the water drain pipe and the oil drain pipe, a support bar is arranged above the third inner cylinder body, and the support bar is connected on the support shaft; a partition plate is arranged in the second inner cylinder body to divide the inner part of the second inner cylinder body into two cavities, namely a first cavity and a second cavity, the first cavity is communicated with an inner oil drain port, a first through hole is formed in the side wall of the upper part of the second inner cylinder body and is communicated with the first cavity, a second through hole is formed in the top wall of the second inner cylinder body and is communicated with the first cavity, and a third through hole is formed in the partition plate wall and is communicated with the first cavity and the second cavity; the water outlet of the oil, mud and water three-phase separation device is communicated with the water inlet of the microbial reaction tank through a middle pipeline, and the water outlet of the microbial reaction tank is communicated with the tubular membrane filtering device through a water outlet pipeline; the concentrated water outlet of the tubular membrane filter device is communicated with the microorganism reaction tank through a concentrated water pipeline, a concentrated water branch pipe is arranged on the concentrated water pipeline, the concentrated water branch pipe is communicated with the water outlet pipeline to form a reflux pipeline of the tubular membrane filter device, and the clear water outlet of the tubular membrane filter device is communicated with the water outlet tank through a clear water pipeline.
Further, a partition plate is arranged in the microbial reaction tank to divide the microbial reaction tank into a facultative zone, a primary aerobic microbial reaction zone, a secondary aerobic microbial reaction zone and a tertiary aerobic microbial reaction zone in sequence; the partition plate is provided with a water passing port which is used for sequentially communicating the facultative zone, the primary aerobic microbial reaction zone, the secondary aerobic microbial reaction zone and the tertiary aerobic microbial reaction zone, the water inlet of the microbial reaction tank is positioned at the facultative zone, the water outlet of the microbial reaction tank is positioned at the tertiary aerobic microbial reaction zone, and the concentrated water outlet of the tubular membrane filtering device is communicated with the primary aerobic microbial reaction zone of the microbial reaction tank through a concentrated water pipeline.
Further, the stirring device in the facultative zone. So that the water is fully mixed, and the excessive impact load is avoided.
Further, aeration devices are arranged in the primary aerobic microorganism reaction zone, the secondary aerobic microorganism reaction zone and the tertiary aerobic microorganism reaction zone, and the aeration devices are anti-blocking membrane aerators.
Further, the tubular membrane filtration device is an external MBR membrane. Is not easy to be blocked and has low cleaning frequency.
Further, the supporting shaft in the oil, mud and water three-phase separation device is a threaded rod, nuts used for being screwed on the supporting shaft are arranged at the bottoms of the upper conical hopper and the lower conical hopper, and the supporting bar is screwed on the supporting shaft.
Further, a slag blowing port is further arranged at the bottom of the cylinder body in the oil, mud and water three-phase separation device, and the slag blowing port is communicated with the bottom of the cone cylinder through a slag blowing pipe. The slag blowing port is in a normally closed state and is mainly used for pressurized sludge cleaning when the slag discharging pipe is blocked.
Further, the diameter of a slag blowing pipe in the oil, mud and water three-phase separation device is smaller than that of a slag discharging pipe.
Further, a sealing cover is arranged at the top of the third inner cylinder body, and the sealing cover is screwed with the supporting shaft through threads. The water yield can be adjusted by rotating the sealing cover and adjusting the distance between the sealing cover and the top of the third inner cylinder body, so that the purpose of controlling the water content in the oil discharge of the oil discharge pipe is achieved.
Further, an oxidation-reduction potentiometer is arranged in the facultative zone.
The beneficial effects of the invention are as follows:
1. The invention omits the traditional filter, has no filter material replacement and dangerous waste treatment problems, the device system does not need adding medicine, the water quality is not modified, and the outlet water quality is stable and superior to the gas field water reinjection standard.
2. The oil, mud and water three-phase separation device realizes multi-layer and multi-section separation in a limited space, greatly improves the water outlet quality and reduces the difficulty for the subsequent water treatment process. The water content of the produced oil is low, which provides favorable conditions for the subsequent recycling of crude oil and reduces the resource waste; and the internal structure is compact, and the occupied area is small. In the process of full static oil-water separation, no movable component is needed, no power device is needed, the energy is saved, and the investment and operation cost is low.
3. The invention has low energy consumption in operation and less sludge discharge.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of an oil, mud and water three-phase separation device;
fig. 3 is a schematic view of another angle structure of the oil, mud, water three-phase separation device.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Example 1: as shown in fig. 1,2 and 3, a gas field water treatment system comprises an oil, mud and water three-phase separation device a, a microbial reaction tank b, a tubular membrane filtration device c and a water outlet tank d; the tubular membrane filter device c is an external MBR membrane. The oil, mud and water three-phase separation device a comprises a cylinder body 1, wherein three inner cylinder bodies 2, two inner cylinder bodies 3 and three inner cylinder bodies 4 are arranged in the cylinder body 1 from outside to inside; the bottoms of the first inner cylinder body 2, the second inner cylinder body 3 and the third inner cylinder body 4 are conical and are provided with openings at the bottoms; the upper outer wall of the third inner cylinder 4 is wrapped with a fourth inner cylinder 5, the first inner cylinder 2 and the second inner cylinder 3 share a top wall, the first inner cylinder 2 and the second inner cylinder 3 are higher than the third inner cylinder 4 in height and lower than the fourth inner cylinder 5 in height, the bottom of the fourth inner cylinder 5 is higher than the bottom of the third inner cylinder 4 and is fixedly connected to the outer wall of the third inner cylinder 4, a supporting rod 6 is welded at the top of the fourth inner cylinder 5, a supporting shaft 7 is connected to the supporting shaft 6 and is positioned at the center of the cylinder 1, two conical hoppers 8 are arranged on the supporting shaft 7, a circle of annular guide plates 9 which are bent inwards are arranged at the top edge of each conical hopper 8, the annular guide plates 9 are obliquely arranged, the joint of each conical guide plate 9 and each conical hopper 8 is a low point, each conical hopper 8 is divided into an upper conical hopper and a lower conical hopper, the bottom of each conical hopper is slightly higher than the bottom of the first inner cylinder 2, a cannula 10 which is inserted into each lower conical hopper is arranged at an opening at the bottom of the second inner cylinder 3, and the bottom of the third inner cylinder 4 is inserted into each conical hopper; the inner wall of the first inner cylinder body 2 is provided with two circles of baffle plates 11 which are divided into an upper baffle plate and a lower baffle plate, the height of the upper baffle plate is slightly higher than that of the upper conical hopper, the height of the lower baffle plate is slightly higher than that of the lower conical hopper, the inner diameter of the upper baffle plate is smaller than the maximum diameter of the upper conical hopper and slightly larger than the inner diameter of the annular guide plate 9 of the upper conical hopper, and the inner diameter of the lower baffle plate is smaller than the maximum diameter of the lower conical hopper and slightly larger than the inner diameter of the annular guide plate 9 of the upper conical hopper; the side wall of the cylinder body 1 is provided with a water inlet 12, a water outlet 13 and an oil outlet 14, the highest point of the water inlet 12 is higher than the top of the first inner cylinder body 1, the lowest point of the water inlet 12 is lower than the top of the first inner cylinder body 1, the water outlet 12 and the oil outlet 14 are slightly lower than the water inlet 12, the side wall of the bottom of the cylinder body 1 is provided with a slag outlet 15, the side wall of the fourth inner cylinder body 5 is provided with an inner water outlet 16, the side wall of the second inner cylinder body 3 is provided with an inner oil outlet 17, the height of the inner oil outlet 17 is higher than that of an upper baffle, the water outlet 13 is communicated with the inner water outlet 16 through the first inner cylinder body 2 and the second inner cylinder body 3, the oil outlet 14 is communicated with the inner oil outlet 17 through the first inner cylinder body 2, the water outlet 18 and the oil outlet 19 are both fixed on the side wall of the cylinder body 1, the first inner cylinder body 2 and the second inner cylinder body 3 are supported by the water outlet 18 and the oil outlet 19, the third inner cylinder body 4 is provided with a support bar 20 above the support bar 20 which is connected on the support shaft 7, the third inner cylinder body 4 is connected with the support shaft 7 by the support bar 20 and the support bar 7, the top of the third inner cylinder body 4 is provided with a seal 32 and a seal cap 32 and a support shaft 7 screwed on the support shaft 7; the inside of the second inner cylinder body 3 is provided with a division plate 21, the inside of the second inner cylinder body 3 is divided into two cavities, namely a cavity 22 and a cavity 23, the cavity 22 is communicated with the inner oil drain 17, the side wall of the upper part of the second inner cylinder body 3 is provided with a through hole 24 and a cavity 22 which are communicated, the top wall of the second inner cylinder body 3 is provided with a through hole 25 and a cavity 22 which are communicated, and the wall of the division plate 21 is provided with a through hole 26 and a cavity 22 which are communicated with the cavity 23. The supporting shaft 7 is a threaded rod, nuts 27 used for being screwed on the supporting shaft are arranged at the bottoms of the upper conical hopper and the lower conical hopper, and the supporting bar 20 is screwed on the supporting shaft 7. The bottom of the cylinder body 1 is provided with a cone cylinder 28, a slag discharging port 15 is communicated with the bottom of the cone cylinder 28 through a slag discharging pipe 29, the bottom of the cylinder body 1 is also provided with a slag blowing port 30, the slag blowing port 30 is communicated with the bottom of the cone cylinder 28 through a slag blowing pipe 31, and the diameter of the slag blowing pipe 31 is smaller than that of the slag discharging pipe 29. The water outlet of the oil, mud and water three-phase separation device a is communicated with the water inlet 34 of the microbial reaction tank b through a middle pipeline 33, and the water outlet 35 of the microbial reaction tank b is communicated with the tubular membrane filtration device c through a water outlet pipeline 36; the concentrated water outlet 37 of the tubular membrane filter device c is communicated with the microbial reaction tank b through a concentrated water pipeline 38, a concentrated water branch pipe 39 is arranged on the concentrated water pipeline 38, the concentrated water branch pipe 39 is communicated with the water outlet pipeline 36 to form a reflux pipeline of the tubular membrane filter device, and the clear water outlet 40 of the tubular membrane filter device c is communicated with the water outlet tank d through a clear water pipeline 41. A division plate is arranged in the microbial reaction tank b to divide the microbial reaction tank b into a facultative zone 42, a primary aerobic microbial reaction zone 43, a secondary aerobic microbial reaction zone 44 and a tertiary aerobic microbial reaction zone 45 in sequence; the partition plate is provided with a water passing port which is used for sequentially communicating the facultative aerobe zone 42, the primary aerobe reaction zone 43, the secondary aerobe reaction zone 44 and the tertiary aerobe reaction zone 45 are internally provided with an aeration device 46, the aeration device 46 is an anti-blocking membrane aerator, the water inlet 35 of the microorganism reaction tank b is positioned at the facultative aerobe zone 42, the water outlet 35 of the microorganism reaction tank b is positioned at the tertiary aerobe reaction zone 45, the facultative aerobe zone 42 is internally provided with a stirring device, and the facultative aerobe zone is internally provided with an oxidation reduction potentiometer. The concentrated water outlet 37 of the tubular membrane filter device c is communicated with the primary aerobic microorganism reaction zone 44 of the microorganism reaction tank b through a concentrated water pipeline 38.
Working principle: when the device works, sewage is pumped in from the water inlet 12, enters the inner cylinder 2 from the bottom through an annular area between the cylinder 1 and the inner cylinder 2, and after the sewage enters the inner cylinder 2, under the action of gravity, mediums with different densities are gradually separated, fine oil drops are separated and accumulated and attached to the outer wall surface of the lower cone-shaped hopper due to the gravity and the density difference, and the oil drops continuously rise due to the fact that the oil drop density is smaller than that of a mixture, and the rising direction of the oil drops is changed and slowly rises along the outer wall surface of the second inner cylinder 3 due to the action of the annular guide plate 9 on the lower cone-shaped hopper; some oil drops attached to the inner wall surface of the first inner cylinder 2 slowly rise along the outer wall surface of the second inner cylinder 3 under the action of the lower baffle 11, enter the first cavity 22 from the first through hole 24 after rising, and finally are discharged from the oil discharge pipe 19. In the sewage rising process, the sewage is blocked by the lower baffle, most of sludge falls back to the bottom of the cylinder body 1 under the action of gravity because the density of the sludge is greater than that of water, and the rest of fine sludge particles also fall to the bottom of the cylinder body 1 or the lower cone-shaped hopper under the combined action of the annular guide plate 9 of the lower cone-shaped hopper and the lower baffle. Some tiny oil drops and particles can continue to flow into the cannula 10 along with the sewage flow, the oil drops and particles pass through the long and narrow channel until encountering the annular guide plate 9 of the upper conical hopper and the upper baffle are affected by gravity, and according to the density difference, the oil drops continue to flow upwards, enter the first cavity 22 through the third through hole 26 and finally are discharged from the oil discharge pipe 19. The particles are blocked and fall into the upper cone. The sewage after deoiling and precipitating continuously enters the third inner cylinder 4, overflows from the top of the third inner cylinder 4 under the action of water pressure and enters the fourth inner cylinder 5, and is discharged from the inner water outlet 16 at the fourth inner cylinder 5 into the water discharge pipe 18 to be discharged, the sealing cover 32 is rotated, the water yield can be adjusted by adjusting the distance between the sealing cover 32 and the top of the third inner cylinder 4, and the purpose of controlling the water content in the oil discharge of the oil discharge pipe is achieved. The oil between the first inner cylinder 2 and the cylinder 1 can also enter the first cavity 22 from the second through hole 25 and finally be discharged from the oil discharge pipe 19. The slag blowing port 30 is in a normally closed state and is mainly used for pressurized sludge cleaning when the slag discharging pipe 29 is blocked.
The water discharged from the water discharge pipe 18 enters the microbial reaction tank b, and firstly enters the facultative zone 42, and the facultative zone 42 mainly aims to further intercept undissolved substances and gradually convert the undissolved substances into dissolved substances, and simultaneously convert difficult biodegradable substances into easily biodegradable substances, so as to improve the biodegradability of the wastewater. Controlling the oxidation-reduction potential of the facultative zone 42 to be 0mV, the residence time to be 4-6 h, and the water ratio of the primary aerobic microbial reaction zone 43, the secondary aerobic microbial reaction zone 44 and the tertiary aerobic microbial reaction zone 45 to be (15-20): 1, a step of; the added strain is mainly nocardia, pseudomonas, bacillus subtilis and alcaligenes. The flora takes organic pollutants in sewage as a nutrition source, and converts complex organic matters into simple inorganic matters through oxidation, reduction and synthesis, so that the degradation of organic matters and oils in the sewage is completed, the aim of sewage purification is fulfilled, purified water is pressurized by a lifting pump and is sent into a tubular membrane filter device c, permeate water of the tubular membrane filter device c is collected into a water outlet tank d, a part of concentrate water flows back to a first-stage aerobic microorganism reaction zone 43 through a concentrate pipeline 38 to ensure the concentration of special microorganisms in a microorganism reaction tank, and a part of concentrate water flows to an inlet of the lifting pump through a concentrate water branch pipe 39 to ensure the cross flow velocity of 1-2m/s in the tubular membrane filter device c.
The described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (8)
1. The gas field water treatment system is characterized by comprising an oil, mud and water three-phase separation device, a microbial reaction tank, a tubular membrane filtration device and a water outlet tank; the oil, mud and water three-phase separation device comprises a cylinder body, wherein three inner cylinder bodies are arranged in the cylinder body, and the three inner cylinder bodies are respectively a first inner cylinder body, a second inner cylinder body and a third inner cylinder body from outside to inside; the bottoms of the first inner cylinder, the second inner cylinder and the third inner cylinder are conical and are provided with openings at the bottoms; the outer wall of the upper part of the third inner cylinder body is wrapped with a fourth inner cylinder body, the first inner cylinder body and the second inner cylinder body share a top wall, the first inner cylinder body and the second inner cylinder body are higher than the third inner cylinder body, the top of the second inner cylinder body is lower than the top of the fourth inner cylinder body, the bottom of the fourth inner cylinder body is higher than the bottom of the third inner cylinder body and is fixedly connected to the outer wall of the third inner cylinder body, a supporting rod is welded at the top of the fourth inner cylinder body, a supporting shaft is connected to the supporting rod and is positioned at the center of the cylinder body, two conical hoppers are arranged on the supporting shaft, the top edge of each conical hopper is provided with a circle of inwards bent annular guide plates, the annular guide plates are obliquely arranged, the joint of each annular guide plate and each conical hopper is a low point, each conical hopper is divided into an upper conical hopper and a lower conical hopper, the bottom of each lower conical hopper is higher than the bottom of the first inner cylinder body, an insertion pipe inserted into the lower conical hopper is arranged at the opening of the bottom of the second inner cylinder body, and the bottom of each upper conical hopper is inserted into the upper conical hopper. The inner wall of the first inner cylinder body is provided with two circles of baffles which are divided into an upper baffle and a lower baffle, the upper baffle is higher than the upper conical hopper, the lower baffle is higher than the lower conical hopper, the inner diameter of the upper baffle is smaller than the maximum diameter of the upper conical hopper and larger than the inner diameter of the annular guide plate of the upper conical hopper, and the inner diameter of the lower baffle is smaller than the maximum diameter of the lower conical hopper and larger than the inner diameter of the annular guide plate of the upper conical hopper; the side wall of the cylinder body is provided with a water inlet, a water outlet and an oil drain opening, the highest point of the water inlet is higher than the top of the first inner cylinder body, the lowest point of the water inlet is lower than the top of the first inner cylinder body, the water outlet and the oil drain opening are lower than the water inlet, the side wall of the bottom of the cylinder body is provided with a slag discharge opening, the side wall of the fourth inner cylinder body is provided with an inner water outlet, the side wall of the second inner cylinder body is provided with an inner oil drain opening, the height of the inner oil drain opening is higher than the height of the upper baffle, the water outlet is communicated with the inner water outlet through the first inner cylinder body and the second inner cylinder body, the oil drain opening is communicated with the inner oil drain opening through the first inner cylinder body, the water drain pipe and the second inner cylinder body are both fixed on the side wall of the cylinder body, the first inner cylinder body and the second inner cylinder body are supported by the water drain pipe and the oil drain pipe, support bars are arranged above the third inner cylinder body and connected on the support shaft; a partition plate is arranged in the second inner cylinder body to divide the inner part of the second inner cylinder body into two cavities, namely a first cavity and a second cavity, the first cavity is communicated with an inner oil drain port, a first through hole is formed in the side wall of the upper part of the second inner cylinder body and is communicated with the first cavity, a second through hole is formed in the top wall of the second inner cylinder body and is communicated with the first cavity, and a third through hole is formed in the partition plate wall and is communicated with the first cavity and the second cavity; the water outlet of the oil, mud and water three-phase separation device is communicated with the water inlet of the microbial reaction tank through a middle pipeline, and the water outlet of the microbial reaction tank is communicated with the tubular membrane filtering device through a water outlet pipeline; the concentrated water outlet of the tubular membrane filter device is communicated with the microorganism reaction tank through a concentrated water pipeline, a concentrated water branch pipe is arranged on the concentrated water pipeline, the concentrated water branch pipe is communicated with a water outlet pipeline to form a reflux pipeline of the tubular membrane filter device, and the clear water outlet of the tubular membrane filter device is communicated with the water outlet tank through a clear water pipeline; the bottom of the cylinder body is provided with a cone cylinder, and the slag discharging port is communicated with the bottom of the cone cylinder through a slag discharging pipe; the supporting shafts in the oil, mud and water three-phase separation device are threaded rods, nuts used for being screwed on the supporting shafts are arranged at the bottoms of the upper conical hopper and the lower conical hopper, and the supporting strips are screwed on the supporting shafts; the bottom of the cylinder body in the oil, mud and water three-phase separation device is also provided with a slag blowing port which is communicated with the bottom of the cone cylinder through a slag blowing pipe.
2. The gas field water treatment system according to claim 1, wherein a partition plate is arranged in the microbial reaction tank to divide the microbial reaction tank into a facultative zone, a primary aerobic microbial reaction zone, a secondary aerobic microbial reaction zone and a tertiary aerobic microbial reaction zone in sequence; the partition plate is provided with a water passing port which is used for sequentially communicating the facultative zone, the primary aerobic microbial reaction zone, the secondary aerobic microbial reaction zone and the tertiary aerobic microbial reaction zone, the water inlet of the microbial reaction tank is positioned at the facultative zone, the water outlet of the microbial reaction tank is positioned at the tertiary aerobic microbial reaction zone, and the concentrated water outlet of the tubular membrane filtering device is communicated with the primary aerobic microbial reaction zone of the microbial reaction tank through a concentrated water pipeline.
3. A gas field water treatment system according to claim 2, wherein the facultative zone is an in-zone agitation device.
4. The gas field water treatment system according to claim 2, wherein aeration devices are arranged in the primary aerobic microbial reaction zone, the secondary aerobic microbial reaction zone and the tertiary aerobic microbial reaction zone, and the aeration devices are anti-clogging membrane aerators.
5. The gas field water treatment system of claim 1, wherein the tubular membrane filtration device is an external MBR membrane.
6. The gas field water treatment system according to claim 1, wherein the diameter of the slag blowing pipe in the oil, mud and water three-phase separation device is smaller than the diameter of the slag discharging pipe.
7. The gas field water treatment system according to claim 1, wherein the top of the third inner cylinder is provided with a sealing cover, and the sealing cover is screwed with the supporting shaft.
8. A gas field water treatment system according to claim 2, wherein an oxidation-reduction potentiometer is provided in the facultative zone.
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