CN114804499B - Oil-containing seawater treatment process - Google Patents
Oil-containing seawater treatment process Download PDFInfo
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- CN114804499B CN114804499B CN202210572668.8A CN202210572668A CN114804499B CN 114804499 B CN114804499 B CN 114804499B CN 202210572668 A CN202210572668 A CN 202210572668A CN 114804499 B CN114804499 B CN 114804499B
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- 238000000034 method Methods 0.000 title claims abstract description 113
- 239000013535 sea water Substances 0.000 title claims abstract description 54
- 239000002245 particle Substances 0.000 claims abstract description 67
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000001179 sorption measurement Methods 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 17
- 244000005700 microbiome Species 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 76
- 229910001018 Cast iron Inorganic materials 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 238000005868 electrolysis reaction Methods 0.000 claims description 12
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 9
- 238000011069 regeneration method Methods 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000007885 magnetic separation Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 3
- 238000007605 air drying Methods 0.000 claims 1
- 239000007864 aqueous solution Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 6
- 239000010865 sewage Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
Images
Classifications
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2103/08—Seawater, e.g. for desalination
Abstract
The invention discloses an oil-containing seawater treatment process, which comprises the following steps: the method comprises the following steps of (1) an oil removing process, (2) a mixing process, (3) a separation process, (4) a rotational flow process, (5) an adsorption process and (6) an ultraviolet process, wherein solid particles are added in the mixing process, the pollutants to be treated are rapidly adsorbed and decomposed by matching with an oxidation process, oil in the oily seawater to be treated can be rapidly removed, microorganisms and zooplankton in the seawater can be killed, and the discharge standard of the oily seawater can be met.
Description
Technical Field
The invention relates to the field of seawater treatment, in particular to an oil-containing seawater treatment process.
Background
In the fields of marine ship transportation industry and the like, the post-treatment of oily sewage, oily seawater and the like is often needed, so that oil stain residue and environmental pollution are avoided. At present, the methods for treating oily sewage at home and abroad mainly comprise the following three types: chemical treatment, physical treatment and biochemical treatment. The physical treatment method does not need additional substances, the equipment can be repeatedly used, the overall cost is low, and the method is a method with more use. Centrifugal separation is also frequently used for the treatment of large-scale oily sewage. However, in the prior art, there are still some disadvantages in terms of the overall consideration of separation efficiency, separation cost and separation effect when treating oil-containing sewage. Wherein, the ballast water is the most common oil-containing seawater in oil tanker transportation, wherein the oil content is about 2000mg/L, and the average oil content of the middle layer of the ballast water is about 25 mg/L.
In the prior art, the treatment of the ship oily wastewater by iron-carbon micro-electrolysis is investigated through single-factor and orthogonal experiments in the novel iron-carbon micro-electrolysis filler pretreatment ship oily ballast water, and the oil removal rate can reach more than 80%. However, the iron-carbon micro-electrolysis treatment of ballast water is long, the treatment speed is low, and the oil removal efficiency is not high, so that it is difficult to apply to ships for treating oily wastewater. In addition, when the iron-carbon filler is used for treatment, the problem of hardening of the iron-carbon filler in the treatment process can exist, and the oil removal efficiency is further influenced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
An object of the present invention is to provide a process for treating oily seawater, which can rapidly realize the treatment of an oily ballast water.
To achieve the above object, an embodiment of the present invention provides an oil-containing seawater treatment process, including:
(1) The oil removing process comprises the following steps: and (3) conveying the oil-containing seawater to an oil removal process for oil removal, wherein the oil content of the oil-containing seawater after oil removal is 15-50mg/L, and conveying the oil stain to an oil collecting pool for collection.
(2) The mixing process comprises the following steps: the oil-containing seawater treated by the oil removal process is conveyed to a mixing process, adsorption particles are added into the mixing process under the action of pneumatic stirring, the adsorption particles are porous cast iron particles and granular activated carbon, the adding amount of the porous cast iron particles is 50g-70g/L, the mass ratio of the porous cast iron particles to the granular activated carbon is 5-10, and the mixing time is 5-15min.
(3) The separation process comprises the following steps: and (2) carrying out magnetic separation and/or centrifugal separation on the mixed fluid in the mixing process, separating solid particles in the mixed fluid from the oil-containing seawater, and conveying the crushed and diluted solid particles to an oxidation process for treatment.
(4) And (3) a rotational flow process: and (4) conveying the water discharged from the separation process to a hydraulic cyclone separation process to remove organisms and particles with the particle size of more than 100 microns.
(5) An adsorption process: and conveying the effluent of the cyclone process to an activated carbon adsorption process, introducing ozone gas into the activated carbon adsorption process, removing residual particulate matters in the oil-containing seawater, killing microorganisms in the seawater and degrading COD (chemical oxygen demand) in the seawater, and introducing the ozone with the concentration of 5-50mg/L for 10-60min.
(6) An ultraviolet process: conveying the effluent of the adsorption process to an ultraviolet treatment process, wherein the ultraviolet ray adopted by the ultraviolet process is 240-270nm, and the retention time is 2-8min; and (4) discharging or back flushing the water discharged by the ultraviolet process after detecting the water quality.
Further, the method comprises a regeneration process, wherein solid-liquid separation is carried out after the oxidation process is finished, solid particles subjected to solid-liquid separation treatment are conveyed to the regeneration process, and the regeneration process is to convey the solid particles to a high-temperature process for high-temperature activation treatment;
further, hydrogen peroxide is added in the oxidation process, wherein the adding concentration of the hydrogen peroxide is 300-500mmol/L.
Furthermore, an electrode is arranged in the oxidation process, a ferroelectric plate is adopted as an anode, porous graphite is adopted as a cathode, the electrolysis voltage is 5V, and the electrolysis time is 10-25min.
Furthermore, the oxidation process comprises an ultrasonic process, and the ultrasonic sound intensity is 100-200W. The particle size of the active carbon particles is 0.5-2mm. The particle size of the porous cast iron particles is 1-3mm.
Further, the activated carbon particles are modified activated carbon, the modified activated carbon is prepared by soaking the activated carbon particles in 0.05-0.1mol/L NaOH alkali liquor to react for 60-120min under the action of ultrasound, taking out the activated carbon particles to clean and air-dry, and soaking the air-dried activated carbon particles in hexadecyl trimethyl ammonium bromide water solution, wherein the concentration of the hexadecyl trimethyl ammonium bromide is preferably 0.2-0.3mol/L;
further, the mass fraction of iron in the porous cast iron particles is 55-75, and the mass fraction of carbon is 25-30. The porous cast iron particles can also contain copper, and the mass portion of the copper is 3-10. The porosity of the porous cast iron particles can be 20-40%;
compared with the prior art, the invention has the beneficial effects that:
(1) According to the oil removing process disclosed by the embodiment of the invention, most of oil stains in the oil-containing seawater can be removed and conveyed to the oil collecting tank for collection, the oil-removed seawater (the oil content is reduced to 20-30 mg/L) enters a mixing process for treatment, wherein porous cast iron particles and particle activated carbon are arranged in the mixing process, the oil, microorganisms and zooplankton in the oil-containing seawater are mixed with the added porous cast iron particles and particle activated carbon and collide with each other in the mixing process, the oil is adsorbed by the porous cast iron particles and the particle activated carbon under the action of pneumatic stirring, the oil can adhere to the microorganisms and zooplankton, and the microorganisms, the oil, the zooplankton and the like in the seawater can be rapidly separated into solid particles through separation in a separation tank and a magnetic separation and/or centrifugal separation process due to particle collision;
(2) The cast iron particles are used as iron-carbon mixed metal to form a plurality of tiny primary batteries to play a role of micro-electrolysis, meanwhile, if the granular activated carbon is added, the activated carbon and the cast iron also play a role of micro-electrolysis, particularly when the granular activated carbon enters a separation tank, the micro-electrolysis is intensified, oil components can be rapidly decomposed, the parts which are difficult to degrade are primarily decomposed into smaller molecules, after the solid separated from the separation tank is crushed and diluted, the solid is conveyed to an oxidation tank, the oil components can be rapidly oxidized and removed, and microorganisms and zooplankton can also be inactivated under the oxidation effect;
(3) An ultrasonic device is arranged in the oxidation process, oil can be quickly subjected to oxidation reaction in the active carbon and the porous cast iron particles under the action of the ultrasonic and the oxidant, so that the desorption efficiency of the oil can be improved, the oil can be quickly degraded, and pollutants in seawater can be quickly removed;
(4) The oily seawater treated by the separation process sequentially enters the cyclone tank and the activated carbon tank, particles in the seawater can be further removed, the activated carbon tank is provided with a dosing port, the amount of ozone can be set according to the quality of effluent water of the activated carbon tank, the requirement of the effluent water of the seawater is finally met, the ultraviolet process can further sterilize and quickly decompose the ozone, and the high ozone content in the effluent water is prevented.
Drawings
Fig. 1 is a schematic view of a process for treating oil-containing seawater according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
The oil-containing ballast water to be treated for a certain oil tanker has an oil content of 2891mg/L.
As shown in fig. 1, a process for treating oil-containing seawater according to a preferred embodiment of the present invention comprises:
(1) The oil removing process comprises the following steps: conveying the oil-containing seawater to an oil removal process for oil removal, wherein the oil content of the oil-containing seawater after oil removal is 15-50mg/L, and conveying the oil stain to an oil collecting pool for collection;
(2) The mixing process comprises the following steps: conveying the oily seawater treated by the oil removal process to a mixing process, wherein in the mixing process, under the action of pneumatic stirring, adsorption particles are added, the adsorption particles are porous cast iron particles and granular activated carbon, the adding amount of the porous cast iron particles is 60g/L, the mass ratio of the porous cast iron particles to the granular activated carbon is 5:1, the mixing time is 10min, the mass part of iron in the porous cast iron particles is 60, and the mass part of carbon is 25;
(3) The separation process comprises the following steps: carrying out magnetic separation and centrifugal separation on the mixed fluid in the mixing process, separating solid particles in the mixed fluid from oil-containing seawater, crushing and diluting the solid particles, and then conveying the crushed and diluted solid particles to an oxidation process for treatment, wherein hydrogen peroxide is added in the oxidation process, the adding concentration of the hydrogen peroxide is 300-500mmol/L, and the oil content of the effluent of the separation process is reduced to 0.5mg/L;
(4) And (3) a rotational flow process: conveying the oil-containing seawater separated by the separation process to a hydrocyclone separation process to remove organisms and particles with the particle size of more than 100 mu m;
(5) An adsorption process: conveying effluent from the cyclone process to an activated carbon adsorption process, introducing ozone gas into the activated carbon adsorption process, removing residual particulate matters in the oil-containing seawater, killing microorganisms in the seawater and degrading COD (chemical oxygen demand) in the seawater, and introducing ozone with the concentration of 15mg/L for 30min;
(6) An ultraviolet process: conveying the effluent of the adsorption process to an ultraviolet treatment process, wherein the ultraviolet ray adopted by the ultraviolet process is 240-270nm, and the retention time is 2-8min; and (4) discharging or back flushing after the water quality of the water discharged by the ultraviolet process is detected.
Example 2
On the basis of the embodiment 1, the activated carbon particles adopt modified activated carbon, the modified activated carbon is obtained by soaking the activated carbon particles in 0.1mol/L NaOH alkali liquor to react for 120min under the action of ultrasound, taking out the activated carbon particles to clean and air-dry, and soaking the air-dried activated carbon particles in hexadecyl trimethyl ammonium bromide water solution, wherein the concentration of the hexadecyl trimethyl ammonium bromide is 0.25mol/L, and the soaking time is 90min. The oil content of the effluent of the separation tank is reduced to 0.1mg/L.
Example 3
On the basis of the embodiment 1, an electrode is arranged in an oxidation pond, a ferroelectric plate is adopted as an anode, porous graphite is adopted as a cathode, the electrolysis voltage is 5V, the electrolysis time is 15min, and the oil content of the effluent of the oxidation pond is not detected.
Example 4
On the basis of the embodiment 1, after the oxidation process is finished, solid-liquid separation is carried out, solid particles subjected to solid-liquid separation treatment are conveyed to the regeneration process, the regeneration process is high-temperature regeneration, the treatment temperature is 200-350 ℃, and the activation time is 20-30min.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (9)
1. A process for treating oil-containing seawater, comprising:
(1) The oil removing process comprises the following steps: conveying the oil-containing seawater to an oil removal process for oil removal, wherein the oil content of the oil-containing seawater after oil removal is 15-50mg/L, and conveying the oil stain to an oil collecting pool for collection;
(2) The mixing process comprises the following steps: conveying the oily seawater treated by the oil removal process to a mixing process, adding adsorption particles into the oily seawater under the action of pneumatic stirring, wherein the adsorption particles are porous cast iron particles and granular activated carbon, the adding amount of the porous cast iron particles is 50g-70g/L, the mass ratio of the porous cast iron particles to the granular activated carbon is 5-10, and the mixing time is 5-15min;
(3) The separation process comprises the following steps: carrying out magnetic separation and/or centrifugal separation on the mixed fluid in the mixing process, separating solid particles in the mixed fluid from oil-containing seawater, crushing and diluting the solid particles, and conveying the crushed and diluted solid particles to an oxidation process for treatment, wherein the oxidation process comprises an ultrasonic process;
(4) And (3) a rotational flow process: conveying the effluent of the separation process to a hydraulic cyclone separation process to remove organisms and particles with the particle size of more than 100 mu m;
(5) An adsorption process: conveying effluent of the cyclone process to an activated carbon adsorption process, introducing ozone gas into the activated carbon adsorption process, removing residual particulate matters in the oil-containing seawater, killing microorganisms in the seawater and degrading COD (chemical oxygen demand) in the seawater, and introducing ozone with the concentration of 5-50mg/L for 10-60min;
(6) An ultraviolet process: conveying the effluent of the adsorption process to an ultraviolet treatment process, wherein the ultraviolet ray adopted by the ultraviolet process is 240-270nm, and the retention time is 2-8min; and (3) discharging or back flushing after detecting the water quality by using the effluent of the ultraviolet process, wherein the oily seawater is oily ballast water.
2. The process for treating oil-containing seawater according to claim 1, further comprising a regeneration process, wherein after the oxidation process is finished, the mixture in the oxidation process is subjected to solid-liquid separation, the solid particles after the solid-liquid separation treatment are conveyed to the regeneration process, and the regeneration process is to convey the solid particles to a high-temperature process for high-temperature activation treatment.
3. The process for treating the oil-containing seawater as claimed in claim 1, wherein hydrogen peroxide is added in the oxidation process, and the adding concentration of the hydrogen peroxide is 300-500mmol/L.
4. The process of claim 1, wherein the oxidation process comprises disposing electrodes, the anode comprises a ferroelectric plate, the cathode comprises porous graphite, the electrolysis voltage is 5V, and the electrolysis time is 10-25min.
5. The process for treating oil-containing seawater of claim 1, wherein the granular activated carbon has a particle size of 0.5 to 2mm.
6. The process for treating oily seawater of claim 1, wherein the porous cast iron particles have a particle size of 1 to 3mm.
7. The process for treating oil-containing seawater according to claim 1, wherein the granular activated carbon is modified activated carbon, the modified activated carbon is prepared by soaking activated carbon granules in 0.05-0.1mol/L NaOH solution, reacting for 60-120min under the action of ultrasound, taking out the activated carbon granules, cleaning and air-drying, and soaking the air-dried activated carbon granules in 0.2-0.3mol/L cetyl trimethyl ammonium bromide aqueous solution.
8. The process for treating oily seawater according to claim 1, wherein the porous cast iron particles comprise 55 to 75 parts by weight of iron and 25 to 30 parts by weight of carbon.
9. The process for treating oily seawater of claim 8, wherein the porous cast iron particles further comprise copper in an amount of 3 to 10 parts by mass.
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