CN111252970A - Oil-water separation method for oily sewage of ship - Google Patents
Oil-water separation method for oily sewage of ship Download PDFInfo
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- CN111252970A CN111252970A CN202010090730.0A CN202010090730A CN111252970A CN 111252970 A CN111252970 A CN 111252970A CN 202010090730 A CN202010090730 A CN 202010090730A CN 111252970 A CN111252970 A CN 111252970A
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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
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
- C02F2101/325—Emulsions
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/001—Build in apparatus for autonomous on board water supply and wastewater treatment (e.g. for aircrafts, cruiseships, oil drilling platforms, railway trains, space stations)
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- 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)
- Physical Water Treatments (AREA)
Abstract
The invention provides an oil-water separation method for oily sewage of a ship, which comprises the following steps: adjusting and heating the oily sewage of the ship to ensure that the water quality and the water quantity of the oily sewage are homogenized and equalized, and the water temperature is increased to 35-45 ℃; mixing the regulated effluent with an auxiliary demulsifier to perform ultrasonic demulsification treatment so as to destabilize and separate out emulsified oil in the sewage; performing oil-water separation treatment on the effluent subjected to ultrasonic demulsification treatment to separate oil and sewage; and carrying out deep dehydration treatment on the separated oil to obtain recovered oil, and completing oil-water separation treatment on the oily sewage of the ship. The water content of the treated recovered oil is less than 2 percent; the water temperature of the sewage separated after the treatment is 35 ℃, the pH value is 6-9, the oil content is less than or equal to 100mg/L, the COD is less than or equal to 3000mg/L, and the suspended matter is less than or equal to 100 mg/L.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an oil-water separation method for oily sewage of ships.
Background
For coastal oil refining enterprises, the transportation of finished oil and crude oil mainly takes ships as main parts, oily sewage generated by the ships comprises ship oil tank ballast water, oil ship tank washing water, engine room oily bilge water and high-concentration oily salt-containing sewage and the like which are collected in emergency in an oil spill accident of marine ships, the sewage belongs to the high-concentration oily salt-containing sewage and mainly contains floating oil, dispersed oil, emulsified oil, dissolved oil, suspended matters and other soluble pollutants, and the method has the characteristics of high oil content, high concentration of the soluble pollutants, large fluctuation and the like, if the method cannot be effectively treated, resources are wasted or the resource value is reduced, and the sewage treatment system is greatly influenced.
The existing oil-containing sewage oil-water separation method for ships has high oil pollutant content and contains a part of solid impurities. Most of the contained oil is oil slick, dispersed oil, emulsified oil and a small amount of dissolved oil, the oil slick and the dispersed oil are easy to treat, and the oil slick and the dispersed oil can be removed by a conventional oil-water separation method. However, emulsified oil in sewage exists in a colloidal state, and demulsification of oily sewage is important to achieve a desired oil-water separation effect. The existing demulsification method is mainly realized by heating and adding a demulsifier, the oily sewage is heated to 70-80 ℃ by steam, a large amount of organic demulsifier is added, and after oil-water separation, the obtained oil has high water content and poor quality and is treated as dirty oil; the separated sewage has high temperature and bad water quality, and subsequent biochemical treatment is carried out only by cooling again. The existing method has the problems of high energy consumption, poor effect, difficult subsequent treatment and the like, so that the development of an oil-water method which has low energy consumption and good quality of recovered oil and is beneficial to the subsequent treatment of sewage is necessary.
Disclosure of Invention
The invention aims to provide an oil-water separation method for ship oily sewage, which can obviously remove the oil content in the sewage, improve the biodegradability of the sewage and ensure the stable operation when the sewage is mixed with other sewage for treatment.
In order to achieve the technical purpose, the invention provides an oil-water separation method of oily sewage of a ship, which comprises the following steps:
s1, adjusting the oily sewage of the ship by adjusting the treatment equipment to ensure that the water quality and the water quantity of the oily sewage of the ship reach homogeneity and average quantity, the water temperature is controlled to be 35-45 ℃, and the time for adjusting treatment is 5-30 min; the adjusting treatment has an oil collecting function and is used for collecting upper oil of oily sewage of the ship;
step S2, adding an auxiliary demulsifying agent by using a medicament dosing device, mixing the adjusted effluent with the auxiliary demulsifying agent, and then performing ultrasonic demulsifying treatment by using an ultrasonic demulsifying device to destabilize, agglomerate and separate out emulsified oil in the sewage, so as to remove the emulsified oil in the sewage;
s3, performing oil-water separation treatment on the effluent subjected to ultrasonic demulsification treatment by using an oil-water separator to separate oil and sewage, wherein the pH value of the separated sewage is 6-9, the oil content is less than or equal to 100mg/L, the COD (chemical oxygen demand) is less than or equal to 3000mg/L, the suspended matters are less than or equal to 100mg/L, and the water content in the oil is reduced;
and step S4, carrying out deep dehydration treatment on the oil separated after oil-water separation treatment through a dehydrator to finish oil-water separation treatment on the oily sewage of the ship, wherein the water content of the obtained recovered oil is less than 2%.
Further, in the step S1, the hydraulic retention time of the sewage after the adjustment treatment is 24h-72 h.
Further, in the step S2, the auxiliary demulsifier is an inorganic electrolyte or an organic compound, the inorganic electrolyte includes aluminum chloride, aluminum sulfate and polyaluminum chloride, and the organic compound includes sodium benzenesulfonate and cationic polyacrylamide with a molecular weight of 700-; the content of the inorganic electrolyte is 50-200 mg/L; the content of the organic compound is 2-20mg/L, so that sewage and oil can be better separated.
Further, in the step S2, the hydraulic retention time of the ultrasonic demulsification treatment is 10min to 50 min; the ultrasonic frequency of the ultrasonic demulsification treatment is 30KHz-100 KHz.
Further, in the step S3, the oil-water separation treatment includes a standing separation process; the time of the standing separation treatment is 1h-4h, so as to better reduce the water content in the oil.
Further, in the step S4, the deep dehydration treatment of the oil includes a process of storing and standing the oil in a storage tank, wherein the storage and standing time is 24h-72 h.
Compared with the prior art:
the ship oily sewage is treated by the separation method, the upper oil of the ship oily sewage is collected, the emulsified oil in the sewage is unstably condensed and separated out, and the emulsified oil in the sewage is removed; the water content in the oil is reduced; so that the main water quality index of the outlet water meets the water inlet requirement of the comprehensive sewage farm: the pH value is 6-9, the oil content is less than or equal to 100mg/L, the COD is less than or equal to 3000mg/L, the suspended matters are less than or equal to 100mg/L, the method is economic and effective, only a small amount of auxiliary demulsifier is needed, the electric energy is used as the main energy consumption, the operation cost is low, the treatment effect is good, and the method is more green and environment-friendly.
Drawings
FIG. 1 is a flow chart of a method for separating oil from water in oily sewage of a ship in an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides an oil-water separation method for oily sewage of a ship, which comprises the following steps:
examples
Referring to FIG. 1, the treatment method of the present invention is directed to oily wastewater from ships. The specific parameters of the oily sewage of the ship are as follows: the pH value is 9, the oil content is 2500mg/L, the COD is 3000mg/L, and the suspended matter is 232 mg/L.
S1, adjusting the oily sewage of the ship through adjusting treatment equipment, wherein the adjusting treatment equipment adopts oil removal and air floatation integrated equipment which is provided with a mixing adjusting area, a heating area and an oil removal area, so that the water quality and the water quantity of the oily sewage of the ship are homogenized and equalized, and the treatment scale of the oil removal and air floatation integrated equipment is set to be 29m3The water temperature is set to be 35 ℃, and the adjusting time of the mixing adjusting area is 10 min; under the action of the heating area and the oil removing area, the floating oil of the oily sewage of the ship is recovered.
Preferably, in the step S1, the hydraulic retention time of the sewage is set to 30 h.
And step S2, adding an auxiliary demulsifier through a medicament dosing device, wherein the medicament dosing device is used for preparing, storing and adding medicaments, mixing the regulated effluent with the auxiliary demulsifier, and then performing ultrasonic demulsification treatment through an ultrasonic demulsification device, wherein the demulsification device is provided with a mixing reaction area and an ultrasonic reaction area, so that emulsified oil in the sewage is destabilized, condensed and precipitated, and the emulsified oil in the sewage is removed.
Preferably, in the step S2, the auxiliary demulsifier is an inorganic electrolyte or an organic compound, the inorganic electrolyte includes aluminum chloride, aluminum sulfate and polyaluminum chloride, and the organic compound includes sodium benzenesulfonate and cationic polyacrylamide with molecular weight of 700-; the content of the inorganic electrolyte is 120 mg/L; the content of the organic compound is 2mg/L for better separation of sewage and oil.
Preferably, in the step S2, the hydraulic retention time of the ultrasonic demulsification treatment is 40 min; the ultrasonic frequency of the ultrasonic demulsification treatment is 30KHz-100 KHz.
Step S3, performing oil-water separation treatment on the effluent subjected to ultrasonic demulsification treatment by using an oil-water separator, wherein the oil-water separator is provided with a heating region, a separation region, an oil collection region and a mud collection region, and is used for separating oil and sewage, and preferably, the oil-water separation treatment comprises a standing separation process; the time for standing separation treatment is 1.5h, so that the water content in the oil is better reduced. The pH value of the separated sewage is 8, the oil content is 100mg/L, the COD is 3000mg/L, and the suspended matters are 100mg/L, so that the water content in the oil is reduced;
and step S4, carrying out deep dehydration treatment on the oil separated after the oil-water separation treatment through a dehydrator to finish the oil-water separation treatment on the oily sewage of the ship, and preferably, the deep dehydration treatment of the oil comprises the process of storing and standing the oil in a storage tank, wherein the storage and standing time is 24 hours. The water content of the recovered oil was 1.9%.
In conclusion, the method is economic and effective, low in cost and good in treatment effect due to the addition of a small amount of auxiliary demulsifier, and is more environment-friendly. After the oily sewage of the ship is treated by the separation method, the main water quality index of the outlet water meets the water inlet requirement of a comprehensive sewage farm: the pH value is 6-9, the oil content is less than or equal to 100mg/L, the COD is less than or equal to 3000mg/L, and the suspended matter is less than or equal to 100 mg/L; high oil recovery rate and low water content.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. An oil-water separation method for oily sewage of ships is characterized by comprising the following steps:
s1, adjusting the ship oily sewage through adjusting treatment equipment to ensure that the quality and the quantity of the ship oily sewage reach homogeneity and average quantity, the water temperature is 35-45 ℃, and the time is 5-30 min;
s2, adding an auxiliary demulsifying agent by using a medicament dosing device, mixing the adjusted effluent with the auxiliary demulsifying agent, and performing ultrasonic demulsifying treatment by using an ultrasonic demulsifying device to destabilize and separate emulsified oil in the sewage;
s3, performing oil-water separation treatment on the effluent subjected to ultrasonic demulsification treatment by using an oil-water separator to separate oil and sewage, wherein the pH value of the separated sewage is 6-9, the oil content is less than or equal to 100mg/L, the COD (chemical oxygen demand) is less than or equal to 3000mg/L, and the suspended matter is less than or equal to 100 mg/L;
s4, carrying out deep dehydration treatment on the oil separated after oil-water separation treatment to finish oil-water separation treatment on the oily sewage of the ship, wherein the water content of the obtained recovered oil is less than 2%.
2. The method for separating oil from water in marine oily sewage according to claim 1, wherein in the step S1, the hydraulic retention time of the sewage subjected to the conditioning treatment is 24 to 72 hours.
3. The method for oil-water separation of marine oily sewage according to claim 2, wherein in the step S2, the auxiliary demulsifier is an inorganic electrolyte or an organic compound, the inorganic electrolyte comprises aluminum chloride, aluminum sulfate and polyaluminum chloride, and the organic compound comprises sodium benzenesulfonate and cationic polyacrylamide with molecular weight of 700- "1200 ten thousand"; the content of the inorganic electrolyte is 50-200 mg/L; the content of the organic compound is 2-20 mg/L.
4. The method for oil-water separation of marine oily sewage according to claim 3, wherein in the step S2, the hydraulic retention time of the ultrasonic demulsification treatment is 10min to 50 min; the ultrasonic frequency of the ultrasonic demulsification treatment is 30KHz-100 KHz.
5. The method for separating oil from water in marine oily sewage according to claim 4, wherein the oil-water separation treatment in step S3 includes a standing separation process; the time of standing separation treatment is 1-4 h.
6. The method for oil-water separation of marine oily sewage according to claim 5, wherein the deep dehydration treatment of oil in step S4 includes a process of storing and standing oil in a storage tank for 24-72 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010090730.0A CN111252970A (en) | 2020-02-13 | 2020-02-13 | Oil-water separation method for oily sewage of ship |
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| CN202010090730.0A CN111252970A (en) | 2020-02-13 | 2020-02-13 | Oil-water separation method for oily sewage of ship |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113415937A (en) * | 2021-06-15 | 2021-09-21 | 盐城海德能水处理环保工程有限公司 | Oil field exploitation wastewater treatment equipment and method |
| CN116639850A (en) * | 2023-07-25 | 2023-08-25 | 北京石油化工学院 | Electric field enhanced demulsification and oil removal device and process for oily sewage with high emulsifying degree |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113415937A (en) * | 2021-06-15 | 2021-09-21 | 盐城海德能水处理环保工程有限公司 | Oil field exploitation wastewater treatment equipment and method |
| CN116639850A (en) * | 2023-07-25 | 2023-08-25 | 北京石油化工学院 | Electric field enhanced demulsification and oil removal device and process for oily sewage with high emulsifying degree |
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Application publication date: 20200609 |