CN103951133A - Oil well wastewater zero-discharge treatment process and device - Google Patents
Oil well wastewater zero-discharge treatment process and device Download PDFInfo
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- CN103951133A CN103951133A CN201410207178.3A CN201410207178A CN103951133A CN 103951133 A CN103951133 A CN 103951133A CN 201410207178 A CN201410207178 A CN 201410207178A CN 103951133 A CN103951133 A CN 103951133A
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- oil
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention belongs to the technical field of wastewater treatment, and particularly relates to an oil well wastewater zero-discharge treatment process and device. The oil well wastewater zero-discharge treatment process comprises the following steps: (a), discharging water from an oil well wastewater station; (b), carrying out electrical floatation treatment; (c), carrying out ultraviolet ozone treatment; (d), carrying out membrane filtration treatment; (e), recycling outlet water; and (f), evaporating membrane thick water, desalting and discharging. According to the process and device disclosed by the invention, deep purifying and recycling and zero discharge of oil well wastewater are realized to achieve the purpose of completely recycling the wastewater in low salt and clear water, so that only are powdered salt and mineral powder are discharged, and therefore, an oil well water consumption and discharge problem is solved radically.
Description
Technical field
The invention belongs to technical field of waste water processing, particularly a kind of oil-well wastewater Zero-discharge treating process and device.
Background technology
Oil is industrial blood, is one of most important strategic energy of country.In order to utilize better petroleum resources, improve production efficiency, oil production has been used a large amount of water resources consumptions, and water resources is occupied extremely important position equally in national economy, is the indispensable resource of social development and human survival.So oilfield exploitation inevitably can produce earth's surface oil-well wastewater, and if these arrive the oil-well wastewaters on earth's surfaces and are processed not in time, can be larger to the destruction of ecotope, its subsequent treatment cost will become geometric growth.No matter so each oilfield unit in charge of construction is from economic benefit or from the angle of environment protection, all oil-well wastewater has been proposed to corresponding processing and reuse requirement.
The each oil drilling platform of China is all provided with waste water station, 3000 ~ 30000 cubic metres/day of the water yields, after processing, waste water reinjection rate generally reaches 80% ~ 90%, discharge 300 ~ 3000 cubic metres/day of discharge waters simultaneously, but Three Difficult Issues are all run into: 1. re-injection water quality does not reach new standard requirement: China's oil-well wastewater is processed " coagulation-air supporting-filtration " the old three cover patterns of mostly continuing to use, in order to protect oil well, improve tar productivity and adapt to the reasons such as oil well is aging, each Petroleum Authority has all improved the water quality standard of re-injection water in recent years, the water quality that above-mentioned old three cover patterns are produced water does not reach new standard.2. discharge water quality does not reach local blowdown new standard: although re-injection rate can reach 90% after wastewater treatment, but always there is 10% waste water to arrange outward, like this, a drilling unit just has 300 ~ 3000T/d waste water to arrange outward, and each place has all been improved pollution exhaust criteria in recent years, comparatively general index is COD < 50ppm, petroleum-type < 3ppm, and this is than high ten times of re-injection water quality requirements.3. the difficulty that reuse water is processed is again increasing, in the water of processing, still contains a large amount of pollutents through old three covers.After 90% reuse, the accumulation repeatedly in infinite loop of salinity, mineralizer, day by day worsens water quality, also more difficult.
Therefore, China's oilfield waste water generally all needs the further degree of depth to process again.
Summary of the invention
The object of the invention is to provides a kind for the treatment of process and device that can carry out to oil-well wastewater deep purifying and industrial reuse for the deficiencies in the prior art.
The object of the present invention is achieved like this.
A kind of oil-well wastewater Zero-discharge treating process, it comprises following methods step successively:
(a) oil-well wastewater station discharge water or old three cover patterns are produced water;
(b) electro-flotation processing;
(c) UV-light ozonize;
(d) membrane filtration processing;
(e) effluent reuse;
(f) the dense water evaporation of film desalination discharge.
Wherein, in described step (a), can be the original waste water of the newly-built waste water station of oil well, or the defective product water in oil-well wastewater station, or qualified discharge water not.
Wherein, described step (b) electro-flotation comprises degree of depth oil removing, electric clarification, sulphide removal, deironing, softening water and germicidal treatment in processing.
Wherein, in described step (c) UV-light ozonize, be CO by the organic substance decomposing of oil-well wastewater
2and H
2o, makes COD < 50ppm.
Wherein, after described step (d) membrane filtration is processed, 90% low-solids water effluent reuse, 10% dense water, by the dense water evaporation of step (f) film desalination, is discharged with dry powder salt.
Wherein, the saltiness < 100ppm of described step (d) membrane filtration oil-well wastewater after treatment, COD < 10ppm.
Wherein, in described step (f), with three grades of evaporations, the recycling condensing water of the dense water 10% after evaporation process, discharges dry powder salt.
A kind of oil-well wastewater zero discharge treatment device, it comprises the dense water evaporation of the electric air floating device, UV-light ozone reactor, membrane filtration treatment unit, the film that set gradually desalination plant.
Wherein, in described electric air floating device, be provided with Ti-Fe-Al compound electrode and rectifier.
Wherein, in described electric air floating device, be provided with gas-solid-liquid triphase separator.
Further, it also comprises vehicle moving device, and electric air floating device, UV-light ozone reactor, membrane filtration treatment unit, the dense water evaporation of film desalination plant are set in turn in vehicle moving device.
beneficial effect of the present invention:the present invention realizes deep purifying reuse and the zero release of oil-well wastewater, reaches waste water 100% with less salt, peace and quiet water reuse, discharge be only powder salt powder, mineral dust, fundamentally solve oil well water and discharge a difficult problem.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of a kind of oil-well wastewater Zero-discharge treating process of embodiments of the invention 1.
Fig. 2 is the principle schematic of a kind of oil-well wastewater zero discharge treatment device of embodiments of the invention 2.
Embodiment
With the drawings and specific embodiments, the present invention is further illustrated below, but the present invention is not subject to the restriction of following embodiment.
embodiment 1.
As shown in Figure 1, a kind of oil-well wastewater Zero-discharge treating process, it comprises following methods step successively:
(a) oil-well wastewater station discharge water or old three cover patterns are produced water; (b) electro-flotation processing; (c) UV-light ozonize; (d) membrane filtration processing; (e) effluent reuse; (f) the dense water evaporation of film desalination discharge.
Wherein, in described step (a), can be the original waste water of the newly-built waste water station of oil well, or the defective product water in oil-well wastewater station, or qualified discharge water not.
Wherein, described step (b) electro-flotation comprises degree of depth oil removing, electric clarification, sulphide removal, deironing, softening water and germicidal treatment in processing.Electro-flotation processing is to use a tower equipment, and in-built electrical pole plate, passes into direct current, reaches following effect.
1. degree of depth oil removing: part water is produced O by electrolysis
2/ H
2bubble, diameter can carefully arrive nano level, and its oil removal by air bubbling ability far away higher than used pressurized dissolved air flotation machine on oil field, and does not have mechanical moving element, is atmospheric operation, and operation troubles is low.
2. electricity clarification: battery lead plate produces Fe/Al ion, can make dirty foreign material flocculate and clarify again in waste water, outclass used Tai-Ace S 150 on oil field, ferric sulfate chemical, without long-distance transport storage chemical difficulty.
3. sulphide removal: on oil field, now add air-blow method removal sulfides from wastewater with adding alkali, but the O that brine electrolysis produces
2just sulfides from wastewater can be oxidized to elemental sulfur and air supporting is removed, this has just exempted the atmospheric pollution of hydrogen sulfide to oil well district, saves again the danger of long-distance transport chemical.
4. deironing: on oil field, now remove iron in waste water with potassium permanganate, but the O that brine electrolysis produces
2just energy deironing, this is the most frequently used water quality air deironing principle, this has just removed this Hazardous Chemical Substances of long-distance transport potassium permanganate from.
5. softening water: existing with the softening waste water of lime-soda process on oil field, reduction waste water salinity, is beneficial to re-injection.But waste water is during by electrolysis, and negative electrode is alkalescence just can reduce hardness, has exempted long-distance transport soda ash, this large-tonnage industrial chemicals of lime.
6. sterilization: now making waste water sterilization with various sterilant on oil field, is all chloride hazardous substance, but just contains sodium-chlor in oil-well wastewater, and electrolysis just produces O
2and chlorine.And then becoming clorox, sterilizing rate can reach 99.99%, not only safety but also the chloride hazardous chemical of needn't transporting for long-distance.
Wherein, in described step (c) UV-light ozonize, be CO by the organic substance decomposing of oil-well wastewater
2and H
2o, makes COD < 50ppm.
UV-light ozonize is a built-in ultra-violet lamp energising of tower equipment, passes into dry air and produces ozone.(1) oil-well wastewater is high chroma, although waste water station You Ji road carbon filter, in water solvability band look contact scar thing still difficulty remove, but ozone can saboteur's structure in chromophoric group, this is the most effective decoloring method of waste water from dyestuff.(2) decomposing organic matter: oil-well wastewater new standard requires COD < 50ppm, ordinary method does not reach this index, that ozone can make these molecular breakdown become carbonic acid gas and water, makes waste water reach new standard because contaminant molecule is not decomposed.
Wherein, the saltiness < 100ppm of described step (d) membrane filtration oil-well wastewater after treatment, COD < 10ppm.Be equivalent to II level surface water, become high-quality re-injection water, 90% water yield reuse.
Wherein, in described step (e), the recycling condensing water of 10% dense water after evaporation process, discharges dry powder salt.Evaporation (MVR) feature is not need boiler, vacuumizes pressurized water steam simultaneously make it to heat up with compressor.Remaining 10% water yield evaporation of membrane concentration, in waste water, salt becomes dry salt powder.
embodiment 2.
As shown in Figure 2, a kind of oil-well wastewater zero discharge treatment device, it comprises the dense water evaporation of the electric air floating device, UV-light ozone reactor, membrane filtration treatment unit, the film that set gradually desalination plant.
Wherein, be provided with Ti-Fe-Al compound electrode in described electric air floating device, battery lead plate produces Fe/Al ion, can make dirty foreign material flocculate and clarify again in waste water, outclass used Tai-Ace S 150 on oil field, ferric sulfate chemical, without long-distance transport storage chemical difficulty.
In electric air floating device, be also provided with rectifier, gas-solid-liquid triphase separator, reach and remove dissolving oil and oil in water emulsion in sewage, removal polarity larger molecular organics, the organic object of degradation of small molecular; There is significant decolouring, sterilizing function.
The oil-well wastewater zero discharge treatment device of the present embodiment also comprises vehicle moving device, and electric air floating device, UV-light ozone reactor, membrane filtration treatment unit, the dense water evaporation of film desalination plant are set in turn in vehicle moving device.Vehicle moving device and electromechanical integration configuration; The oil-well wastewater zero discharge treatment device of the present embodiment is a set of 300T/d equipment, be contained on 40T flat-bed trailer just removable, on-the-spot under unloading after water flowing energising can use.Electromechanical integration configuration is all furnished with PLC chip controls, only need on touch-screen, input operation parameter can realize automated operation.
Application mode: 1. oil-well wastewater zero discharge treatment device of the present invention is contained in waste water station end, can improve reuse water quality, reaches new standard.2. the oil-well wastewater zero discharge treatment device of invention is contained in waste water station discharge mouth of a river end, can reach local discharge new standard.3. oil-well wastewater zero discharge treatment device of the present invention is contained in top, drinking station, can make brackish water salinity reduce, and water quality clarification is colourless aseptic, after film system, can quote, and extends the life-span for the treatment of unit.
Unaccounted feature in the present embodiment, adopts the explanation in embodiment 1, no longer repeats at this.
The above is only preferred embodiment of the present invention, and the equivalence of doing according to structure, feature and principle described in patent claim of the present invention therefore all changes or modifies, and is included in patent claim of the present invention.
Claims (10)
1. an oil-well wastewater Zero-discharge treating process, is characterized in that: it comprises following methods step successively:
(a) oil-well wastewater station discharge water;
(b) electro-flotation processing;
(c) UV-light ozonize;
(d) membrane filtration processing;
(e) effluent reuse;
(f) the dense water evaporation of film desalination discharge.
2. a kind of oil-well wastewater Zero-discharge treating process according to claim 1, is characterized in that: described step (b) electro-flotation comprises degree of depth oil removing, electric clarification, sulphide removal, deironing, softening water and germicidal treatment in processing.
3. a kind of oil-well wastewater Zero-discharge treating process according to claim 1, is characterized in that: in described step (c) UV-light ozonize, be CO by the organic substance decomposing of oil-well wastewater
2and H
2o, makes COD < 50ppm.
4. a kind of oil-well wastewater Zero-discharge treating process according to claim 1, is characterized in that: after described step (d) membrane filtration is processed, and 90% low-solids water effluent reuse, 10% dense water, by the dense water evaporation of step (f) film desalination, is discharged with dry powder salt.
5. a kind of oil-well wastewater Zero-discharge treating process according to claim 1, is characterized in that: the saltiness < 100ppm of described step (d) membrane filtration oil-well wastewater after treatment, COD < 10ppm.
6. a kind of oil-well wastewater Zero-discharge treating process according to claim 4, is characterized in that: in described step (f), the recycling condensing water of 10% dense water after evaporation process, discharges dry powder salt.
7. a kind of oil-well wastewater zero discharge treatment device described in claim 1 ~ 6 any one, is characterized in that: it comprises the dense water evaporation of the electric air floating device, UV-light ozone reactor, membrane filtration treatment unit, the film that set gradually desalination plant.
8. a kind of oil-well wastewater zero discharge treatment device according to claim 7, is characterized in that: in described electric air floating device, be provided with Ti-Fe-Al compound electrode and rectifier.
9. a kind of oil-well wastewater zero discharge treatment device according to claim 7, is characterized in that: in described electric air floating device, be provided with gas-solid-liquid triphase separator.
10. a kind of oil-well wastewater zero discharge treatment device according to claim 7, it is characterized in that: it also comprises vehicle moving device, electric air floating device, UV-light ozone reactor, membrane filtration treatment unit, the dense water evaporation of film desalination plant are set in turn in vehicle moving device.
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Patent Citations (9)
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|---|---|---|---|---|
| EP0754166B1 (en) * | 1993-11-26 | 1999-02-24 | Deheurles, Alain | Method for a waste water treatment plant |
| CN101269902A (en) * | 2008-04-01 | 2008-09-24 | 总装备部工程设计研究总院 | Purification method for wastewater of ammunition disassembly |
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Effective date of registration: 20151104 Address after: 523000 Guangdong Province, Dongguan City Dongcheng qiantou Shui Wo Street No. 8 Lane six Applicant after: Dongfuan Yingliu Water Purification Service Co., Ltd. Address before: 523050 Guangdong province Dongguan City Wanjiang Jane Shazhou commercial street two ranked No. 31 Applicant before: Dongguan Zhujiang Saline Water Desalination Institute |
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