CN113233660A - Treatment method of salt-containing organic wastewater in oilfield sewage - Google Patents
Treatment method of salt-containing organic wastewater in oilfield sewage Download PDFInfo
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- CN113233660A CN113233660A CN202110475357.5A CN202110475357A CN113233660A CN 113233660 A CN113233660 A CN 113233660A CN 202110475357 A CN202110475357 A CN 202110475357A CN 113233660 A CN113233660 A CN 113233660A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 50
- 150000003839 salts Chemical class 0.000 title claims abstract description 39
- 239000010865 sewage Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 16
- 238000005345 coagulation Methods 0.000 claims abstract description 15
- 230000015271 coagulation Effects 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000909 electrodialysis Methods 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 6
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000010457 zeolite Substances 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- 239000008394 flocculating agent Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000011033 desalting Methods 0.000 claims description 3
- 230000003311 flocculating effect Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 239000012528 membrane Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 13
- 239000010779 crude oil Substances 0.000 description 2
- 230000029219 regulation of pH Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
- C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
-
- 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
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)
- Water Treatment By Electricity Or Magnetism (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a method for treating salt-containing organic wastewater in oilfield sewage, which comprises a primary separation unit, a pH adjusting unit, a coagulation sedimentation unit, a filtering unit, an oxidizing unit and an electrodialysis unit, wherein the primary separation unit, the pH adjusting unit, the coagulation sedimentation unit, the filtering unit, the oxidizing unit and the electrodialysis unit are connected through special pipelines, and composite materials consisting of zeolite and activated carbon are filled in the special pipelines. The composite material can adsorb oil in wastewater and recover the oil. The retardation of petroleum substances on the pipeline is reduced. According to the invention, the pipeline used in the salt-containing organic wastewater treatment process is set to be a porous material containing adsorbed petroleum substances, so that the influence of the petroleum substances on the pipeline is reduced, the pipeline can be degraded to recover oil, a large amount of oil is prevented from being trapped on the inner wall of the pipeline in the wastewater treatment process, and the damage to the ion permeable membrane can be avoided.
Description
Technical Field
The invention relates to the technical field of salt-containing organic wastewater treatment, in particular to a method for treating salt-containing organic wastewater in oilfield sewage.
Background
At present, in the middle and later stages of oil exploitation in China, the water content of crude oil extracted from underground is gradually increased, the treatment capacity of oily sewage is also gradually increased, and particularly, the difficulty of oil-water separation of the oily sewage is further increased along with the improvement of the recovery ratio of the crude oil, so that the high oily sewage not only causes abnormal operation of ground facilities, stratum blockage and environmental pollution, but also causes a large amount of waste oil to be injected back to the underground again, and huge waste is caused.
Softening the oil field sewage to generate a large amount of high-temperature high-salt organic wastewater. At present, the treatment method of organic wastewater containing salt has the problems of long period and poor treatment effect, and oil in the organic wastewater containing salt is greatly intercepted on the inner wall of a pipeline in the pipeline transmission stage in the treatment process, so that the conveying capacity loss is caused, and the service life of the pipeline is limited for a long time. In addition, ion exchange membranes are easily damaged or clogged during desalination. Therefore, the invention provides a method for treating salt-containing organic wastewater in oilfield sewage, which aims to overcome the defects in the prior art.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for treating organic wastewater containing salt in oilfield sewage.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme.
A method for treating organic wastewater containing salt in oilfield sewage comprises the following steps:
step one, a primary separation unit: discharging the salt-containing organic wastewater in the sewage tank to an oil separation tank for primary separation;
step two, a pH adjusting unit: discharging the sewage after oil removal to a pH adjusting tank by using a special pipeline, adding a pH regulator into the pH adjusting tank, and adjusting the pH value of the salt-containing organic wastewater to be between 5.5 and 6.2;
step three, a coagulation sedimentation unit: discharging the organic wastewater containing salt and adjusted by the pH value to a coagulation sedimentation tank, then adding a flocculating agent of 100-500mg/L into the coagulation sedimentation tank, flocculating impurities in the organic wastewater containing salt, and then settling the flocculate to remove suspended matters;
step four, a filtering unit: discharging the settled salt-containing organic wastewater to a filtering unit for filtering treatment;
step five, an oxidation unit: adding a pH regulator into the filtered salt-containing organic wastewater again, regulating the pH value to be between 7.0 and 8.0, discharging the salt-containing organic wastewater into an oxygen aeration tank for oxidation treatment, and introducing 2-5mg of ozone into each liter of wastewater for 30-60 minutes;
step six, an electrodialysis unit: and (3) desalting the wastewater subjected to organic matter removal by the oxidation unit by using an electrodialyzer at a current of 1-1.5A and a voltage of 150V.
The primary separation unit, the pH adjusting unit, the coagulation sedimentation unit, the filtering unit, the oxidation unit and the electrodialysis unit are connected through special pipelines, composite materials composed of zeolite and activated carbon are filled in the special pipelines, and the composite materials are replaced periodically.
The composite material can adsorb oil in wastewater and recover the oil. The retardation of petroleum substances on the pipeline is reduced.
Further: the flocculating agent is any one of polyaluminum ferric chloride, polyaluminum sulfate, polyaluminum chloride, polyaluminum phosphate and polyaluminum silicate chloride.
According to the invention, the pipeline used in the salt-containing organic wastewater treatment process is set to be a porous material containing adsorbed petroleum substances, so that the influence of the petroleum substances on the pipeline is reduced, the pipeline can be degraded to recover oil, a large amount of oil is prevented from being trapped on the inner wall of the pipeline in the wastewater treatment process, and the service life of the pipeline can be prolonged. Before the electrodialysis unit, the damage to the ion permeable membrane in the electrodialysis unit is reduced by removing suspended matters and adsorbing oil by a special pipeline.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
The embodiment provides a treatment method of salt-containing organic wastewater in oilfield sewage, which comprises a primary separation unit, a pH regulation unit, a coagulation sedimentation unit, a filtration unit, an oxidation unit and an electrodialysis unit, wherein the primary separation unit, the pH regulation unit, the coagulation sedimentation unit, the filtration unit, the oxidation unit and the electrodialysis unit are connected through special pipelines, and composite materials composed of zeolite and activated carbon are filled in the special pipelines. The composite material consists of 20-40wt% of zeolite and 60-80wt% of activated carbon.
The indexes of the organic wastewater to be treated are as follows:
step one, a primary separation unit: discharging the salt-containing organic wastewater in the sewage tank to an oil separation tank for primary separation;
step two, a pH adjusting unit: discharging the sewage after oil removal to a pH adjusting tank by using a special pipeline, adding a pH regulator into the pH adjusting tank, and adjusting the pH value of the salt-containing organic wastewater to be between 5.5 and 6.2;
step three, a coagulation sedimentation unit: discharging the organic wastewater containing salt and adjusted by the pH value to a coagulation sedimentation tank, adding 300mg/L of flocculating agent polyaluminium sulfate into the coagulation sedimentation tank, flocculating impurities in the organic wastewater containing salt, and settling flocculates to remove suspended matters;
step four, a filtering unit: discharging the settled organic wastewater containing salt to a filter tank unit for filtering treatment to remove micro flocculates;
step five, an oxidation unit: and adding a pH regulator into the filtered salt-containing organic wastewater again, regulating the pH value to be between 7.0 and 8.0, discharging the salt-containing organic wastewater to an oxygen aeration tank for oxidation treatment, and introducing 4mg of ozone into each liter of wastewater for 30 to 60 minutes to further remove organic matters in the wastewater.
Step six, an electrodialysis unit: the wastewater which is subjected to organic matter removal by the oxidation unit is desalted by an electrodialyzer, the current is 1-1.5A, the voltage is 150v, the purification treatment of the organic wastewater containing salt is completed, the treated wastewater reaches the discharge standard of Integrated wastewater discharge Standard (GB8978-1996), and the desalting rate reaches 87%.
The indexes of the treated wastewater are as follows:
the foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A method for treating organic wastewater containing salt in oilfield sewage is characterized by comprising the following steps: the method comprises the following steps:
step one, a primary separation unit: discharging the salt-containing organic wastewater in the sewage tank to an oil separation tank for primary separation;
step two, a pH adjusting unit: discharging the sewage after oil removal to a pH adjusting tank by using a special pipeline, adding a pH regulator into the pH adjusting tank, and adjusting the pH value of the salt-containing organic wastewater to be between 5.5 and 6.2;
step three, a coagulation sedimentation unit: discharging the organic wastewater containing salt and adjusted by the pH value to a coagulation sedimentation tank, then adding a flocculating agent of 100-500mg/L into the coagulation sedimentation tank, flocculating impurities in the organic wastewater containing salt, and then settling the flocculate to remove suspended matters;
step four, a filtering unit: discharging the settled salt-containing organic wastewater to a filtering unit for filtering treatment;
step five, an oxidation unit: adding a pH regulator into the filtered salt-containing organic wastewater again, regulating the pH value to be between 7.0 and 8.0, discharging the salt-containing organic wastewater into an oxygen aeration tank for oxidation treatment, and introducing 2-5mg of ozone into each liter of wastewater for 30-60 minutes;
step six, an electrodialysis unit: and (3) desalting the wastewater subjected to organic matter removal by the oxidation unit by using an electrodialyzer at a current of 1-1.5A and a voltage of 150V.
2. The method for treating the organic wastewater containing salt in the oilfield sewage according to claim 1, which is characterized in that: the flocculating agent is any one of polyaluminum ferric chloride, polyaluminum sulfate, polyaluminum chloride, polyaluminum phosphate and polyaluminum silicate chloride.
3. The method for treating the organic wastewater containing salt in the oilfield sewage according to claim 1, which is characterized in that: the primary separation unit, the pH adjusting unit, the coagulation sedimentation unit, the filtering unit, the oxidation unit and the electrodialysis unit are connected through special pipelines, composite materials composed of zeolite and activated carbon are filled in the special pipelines, and the composite materials are replaced periodically.
4. The method for treating the organic wastewater containing salt in the oilfield sewage according to claim 3, wherein the method comprises the following steps: the composite material consists of 20-40wt% of zeolite and 60-80wt% of activated carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110475357.5A CN113233660A (en) | 2021-04-29 | 2021-04-29 | Treatment method of salt-containing organic wastewater in oilfield sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110475357.5A CN113233660A (en) | 2021-04-29 | 2021-04-29 | Treatment method of salt-containing organic wastewater in oilfield sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113233660A true CN113233660A (en) | 2021-08-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110475357.5A Pending CN113233660A (en) | 2021-04-29 | 2021-04-29 | Treatment method of salt-containing organic wastewater in oilfield sewage |
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| Country | Link |
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| CN (1) | CN113233660A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113754146A (en) * | 2021-09-13 | 2021-12-07 | 濮阳天地人环保科技股份有限公司 | Method for treating shallow bubble gas production wastewater by using electrochemistry and Fenton reagent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923878A (en) * | 2012-10-23 | 2013-02-13 | 西安建筑科技大学 | Equipment and process for modular treatment of oil field wastewater |
| CN105502728A (en) * | 2015-11-25 | 2016-04-20 | 克拉玛依市三达新技术股份有限公司 | Treatment method for high temperature and high salinity organic wastewater generated by oilfield sewage softening |
| CN106745945A (en) * | 2015-11-24 | 2017-05-31 | 中国石油天然气股份有限公司 | Oil sand washing water treatment method |
| CN207567004U (en) * | 2017-11-27 | 2018-07-03 | 钦州学院 | A kind of slope shape adsorption filtration pipeline oil-contained waste water treatment system |
-
2021
- 2021-04-29 CN CN202110475357.5A patent/CN113233660A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923878A (en) * | 2012-10-23 | 2013-02-13 | 西安建筑科技大学 | Equipment and process for modular treatment of oil field wastewater |
| CN106745945A (en) * | 2015-11-24 | 2017-05-31 | 中国石油天然气股份有限公司 | Oil sand washing water treatment method |
| CN105502728A (en) * | 2015-11-25 | 2016-04-20 | 克拉玛依市三达新技术股份有限公司 | Treatment method for high temperature and high salinity organic wastewater generated by oilfield sewage softening |
| CN207567004U (en) * | 2017-11-27 | 2018-07-03 | 钦州学院 | A kind of slope shape adsorption filtration pipeline oil-contained waste water treatment system |
Non-Patent Citations (1)
| Title |
|---|
| 马锐侠;刘发强;蔡庆辉;原野;: "含油废水综合处理技术研究", 石化技术与应用, vol. 25, no. 2, pages 168 - 170 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113754146A (en) * | 2021-09-13 | 2021-12-07 | 濮阳天地人环保科技股份有限公司 | Method for treating shallow bubble gas production wastewater by using electrochemistry and Fenton reagent |
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Application publication date: 20210810 |