CN110835209A - Centralized treatment method and system for oily sewage of ship - Google Patents
Centralized treatment method and system for oily sewage of ship Download PDFInfo
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- CN110835209A CN110835209A CN201911305261.3A CN201911305261A CN110835209A CN 110835209 A CN110835209 A CN 110835209A CN 201911305261 A CN201911305261 A CN 201911305261A CN 110835209 A CN110835209 A CN 110835209A
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a centralized treatment method of oily sewage of ships, which comprises the steps of conveying ship wastewater to a demulsification pool, adding a demulsifier, performing demulsification reaction at a certain temperature, and removing floating oil; then sending the wastewater into a dissolved air flotation machine, wherein the dissolved air flotation machine generates a large amount of micro bubbles in water, adsorbs unseparated and clean dispersed oil drops in the wastewater, and floats to sleep to further realize oil-water separation; and the wastewater sequentially enters a facultative tank, an IC anaerobic tower, an aerobic tank and an aeration biological filter for biochemical treatment, and is finally treated by an ultrafiltration system and a nanofiltration system, so that the water quality reaches the standard and is recycled. The biochemical system consisting of the facultative tank, the IC anaerobic tower, the aerobic tank and the aeration biological filter tank has the removal rate of organic matters in the wastewater of more than 82 percent, which is far higher than that of the traditional biochemical system, and the process realizes zero discharge of the wastewater.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a centralized treatment method and system for oily sewage of ships.
Background
The oily sewage of the ship refers to sewage containing crude oil, fuel oil, lubricating oil and other various petroleum products and residues thereof generated in the operation process of the ship, and comprises oily sewage at a machine place and sewage containing cargo oil residues, which mainly come from ship tank washing water, ship ballast water and ship tank bottom water. The water quantity of the ship tank washing water is counted to be about 20% of the ship load capacity, the components of the ship tank washing water are oil, mud, rust, trace phenol and the like, and the oil content is one percent to three percent. When the tank is washed, high-pressure hot water is needed for washing, and a detergent is also used, so that oil and water are fully mixed, and the emulsification degree is high. The water quantity of the cabin bottom is related to the freshness, the maintenance, the berthing and the like of a ship, the water quantity generated every year is generally about 10% of the loading capacity of the ship, the water content of the ship bottom is extremely complex, and the ship contains various oil and mechanical impurities. China is a shipping big country, and the random discharge of oily sewage of ships without treatment can cause serious pollution to inland rivers or coastal sea areas, and seriously affect the survival of marine organisms and the balance of marine ecology. In view of the harmfulness of such oily sewage, it is listed in "records of hazardous waste" HW08 in China.
The ship oily sewage contains a large amount of water and a large amount of compounds such as petroleum in the water, and typical pollutants in the sewage comprise fuel oil, a cleaning agent, a water-containing film, a foaming agent and the like. At present, the method for treating oily sewage of ships mainly combines physicochemical and biological treatment technologies, and has the following main problems:
(1) the oil in the oily sewage cannot be recycled;
(2) the oily sewage is difficult to treat, the produced water is difficult to reach the standard, and the treated wastewater cannot be recycled;
(3) the activated sludge method has low efficiency and poor treatment effect in directly treating the oily sewage, needs a secondary sedimentation tank and occupies large area;
(4) the conventional membrane treatment of oily sewage easily causes the problems of membrane blockage and concentrated water treatment.
In order to respond to the national policy of energy conservation and emission reduction, an oil-containing sewage centralized treatment system is urgently needed to be designed, and the problems and the defects of the existing oil-containing sewage treatment process are solved.
Disclosure of Invention
The invention aims to provide a centralized treatment method and a centralized treatment system for oily sewage of ships, which solve the problems that oil and produced water cannot be recovered, the treatment effect of activated sludge is poor, the occupation area of a secondary sedimentation tank is large, membranes are blocked, concentrated water is treated and the like in the conventional treatment process.
In order to solve the problems, the invention adopts the following technical scheme:
a centralized treatment method for oily sewage of ships comprises the following steps:
(1) conveying the ship wastewater to a demulsification pool, adding a demulsifier, performing demulsification reaction at a certain temperature, and removing floating oil;
(2) sending the wastewater obtained by the step (1) into a dissolved air flotation machine, wherein the dissolved air flotation machine generates a large amount of micro-bubbles in the water, adsorbing unseparated and clean dispersed oil drops in the wastewater, and floating to sleep to further realize oil-water separation;
(3) the wastewater treated by the dissolved air floatation machine sequentially enters a facultative tank, an IC anaerobic tower, an aerobic tank and an aeration biological filter for biochemical treatment, and an organic matter in the wastewater can be effectively removed by a biochemical system constructed by the facultative tank, the IC anaerobic tower, the aerobic tank and the aeration biological filter;
(4) collecting the effluent of the biological aerated filter, and conveying the effluent to an ultrafiltration system for removing particulate matters;
(5) and conveying the produced water of the ultrafiltration system to a nanofiltration system for further advanced treatment, and finally enabling the quality of the effluent to reach the standard to realize recycling.
(6) In the process, concentrated water obtained by the ultrafiltration system and the nanofiltration system in the step (5) is conveyed to a facultative tank for circular treatment, so that zero discharge of wastewater is realized.
A centralized treatment system for oily sewage of ships comprises a demulsification tank, a dissolved air floatation machine, an oil recovery tank, a facultative tank, an IC anaerobic tower, a biogas collection tank, an aerobic tank, an aeration biological filter, a water production tank, an ultrafiltration system and a nanofiltration system; the water outlet of the demulsification pool is communicated with the water inlet of the dissolved air flotation machine, the oil recovery pool is arranged on one side of the demulsification pool, the oil outlet at the top of the dissolved air flotation machine is communicated with the oil recovery pool, the water outlet of the dissolved air flotation machine is communicated with the water inlet at the upper part of the facultative tank, the water outlet of the facultative tank is communicated with the water inlet at the bottom of the IC anaerobic tower, the water outlet at the upper part of the IC anaerobic tower is connected with the water production pool through an aerobic pool and an aeration biological filter in sequence, and the gas; the water outlet of the water producing tank is communicated with the water inlet of the ultrafiltration system, the water producing port of the ultrafiltration system is communicated with the water inlet of the nanofiltration system, the water producing port of the nanofiltration system is communicated with the reuse water tank, and the concentrated water ports of the ultrafiltration system and the nanofiltration system are communicated with the facultative tank.
Furthermore, a heating cavity is arranged at the outer side of the bottom of the demulsification pool, a burner is arranged in the heating cavity, a biogas collection tank is communicated with a burner pipeline in the heating cavity through a biogas purification device, and a flue gas pipe is arranged at the upper side of the heating cavity.
Compared with the prior art, the invention has the following advantages: (1) recovering the oil in the oily sewage to realize resource utilization; (2) the ultrafiltration-nanofiltration system has large water yield and good water quality and can be reused in plants; (3) and collecting methane generated by the IC anaerobic tower as clean energy, and heating the demulsification pool. (4) The aeration biological filter is adopted, so that a secondary sedimentation tank is omitted, the treatment effect is good, the occupied area is small, and the capital cost is reduced; (5) the automation is easy to realize, and the operation is simple and convenient; (6) the biochemical system consisting of the facultative tank, the IC anaerobic tower, the aerobic tank and the aeration biological filter tank has the removal rate of organic matters in the wastewater of more than 82 percent, which is far higher than that of the traditional biochemical system, and the process realizes zero discharge of the wastewater.
Drawings
FIG. 1 is a schematic view of a centralized treatment system for oily sewage of a ship in example 1.
Fig. 2 is a schematic structural diagram of the breast breaking pool in example 1.
Detailed Description
The invention is further illustrated by the following specific examples and the accompanying drawings.
Example 1:
as shown in fig. 1, a centralized treatment system for oily sewage of ships comprises a demulsification tank 1, a dissolved air flotation machine 2, an oil recovery tank 3, a facultative tank 4, an IC anaerobic tower 5, a biogas collection tank 6, an aerobic tank 7, an aeration biological filter tank 8, a water production tank 9, an ultrafiltration system 10, a nanofiltration system 11 and a reuse water tank 12; the water outlet of the demulsification tank 1 is communicated with the water inlet of the dissolved air flotation machine 2, the oil recovery tank 3 is arranged on one side of the demulsification tank 1, the oil outlet at the top of the dissolved air flotation machine 2 is communicated with the oil recovery tank 3, the water outlet of the dissolved air flotation machine 2 is communicated with the water inlet at the upper part of the facultative tank 4, the water outlet of the facultative tank 4 is communicated with the water inlet at the bottom of the IC anaerobic tower 5, the water outlet at the upper part of the IC anaerobic tower is connected with the water production tank 9 through the aerobic tank 7 and the aeration biological filter 8 in sequence, and the gas outlet at the top of the IC; the water outlet of the water producing tank 9 is communicated with the water inlet of the ultrafiltration system 10, the water producing port of the ultrafiltration system 10 is communicated with the water inlet of the nanofiltration system 11, the water producing port of the nanofiltration system 11 is communicated with the reuse water tank 12, and the concentrated water port of the nanofiltration system is communicated with the facultative tank, so that the cyclic treatment of the concentrated water is realized.
Further, as shown in fig. 2, a heating cavity 13 is arranged at the outer side of the bottom of the emulsion breaking tank 1, a burner 14 is arranged in the heating cavity 14, the biogas collection tank 6 is communicated with the burner 12 in the heating cavity 13 through a biogas purification device, and a flue gas pipe 15 is arranged at the upper side of the heating cavity 13 and used for discharging generated flue gas. And the marsh gas collected in the marsh gas collecting tank 6 is purified and then is conveyed into a combustor to heat the wastewater in the demulsification pool 1, so as to promote the demulsification reaction. In addition, at demulsification pond 1 internal fixation stirring device 17, set up delivery port 20 in demulsification pond bottom, delivery port 20 one side upper portion sets up the oil-out 19 with oil recovery pond 3 intercommunication, demulsification pond 1 upper portion water inlet sets up the oil skimmer, the oil skimmer includes L shape scraper blade 16 and horizontal pull rod 17, L shape scraper blade 16 is connected with horizontal pull rod 17, under the drive of horizontal pull rod 17, L shape scraper blade 16 moves along demulsification pond length direction, with the oil reservoir of demulsification pond upper surface through the oil-out entering oil recovery pond 3 in.
The ship oily sewage centralized treatment system comprises the following specific application processes: the method comprises the following steps of (1) enabling ship sewage to enter a demulsification tank from an upper water inlet, adding a demulsifier when the ship sewage is heated to 40-60 ℃, starting a stirring device to stir slowly in the adding process, fully mixing, fully standing for 24 hours until oil-water separation is realized, and then sending upper-layer floating oil into an oil recovery tank by using an oil skimmer; the sewage from which the upper-layer floating oil is skimmed enters a dissolved air flotation machine, an air flotation system of the dissolved air flotation machine generates a large amount of micro bubbles in water, so that air is attached to dispersed oil particles in a highly dispersed micro bubble form to cause a state that the density is smaller than that of the water, the remaining dispersed oil particles float on the water surface by utilizing a buoyancy principle, oil-water separation is further realized, the floating oil enters an oil recovery tank, and the sewage flows into a facultative tank, so that the change of the survival environment of anaerobic bacteria caused by directly entering an IC anaerobic tower can be avoided; secondly, in the facultative tank, a part of organic matters in the sewage are decomposed by facultative anaerobes, meanwhile, macromolecular organic matters are partially decomposed into micromolecular organic matters, effluent enters an IC anaerobic tower, the anaerobes further decompose the organic matters, a large amount of biogas is generated in the process, and the biogas is collected into a biogas collection tank through the top of the IC anaerobic tower; the effluent of the IC anaerobic tower enters an aerobic tank, oxygen is continuously provided for the respiration of microorganisms at the bottom of the tank body through an aeration fan, and organic matters are further degraded and consumed in the process; aerobic tank effluent enters a biological aerated filter, sewage is purified through the filtering material interception and the biological flocculation of a surface microbial membrane, particulate matters are filtered, the effluent turbidity is reduced, the effluent quality is good, after being collected by a production tank, the effluent enters an ultrafiltration system and a nanofiltration system in sequence to carry out a depth system, the sewage is subjected to double purification and filtration through the ultrafiltration membrane and the nanofiltration membrane, most organic matters, particulate matters and other impurities in the sewage are intercepted, the system produced water quality is good, the system produced water is collected and recycled through a recycling tank, the system concentrated water contains organic matters, the impurity content of salts, particulate matters and the like is high, the part of concentrated water flows back to a facultative tank, is mixed with the effluent of a dissolved air flotation machine, and is continuously treated.
Example 2
A centralized treatment method for oily sewage of ships comprises the following steps:
(1) conveying the ship wastewater to a demulsification pool, adding a demulsifier, performing demulsification reaction at a certain temperature, and removing floating oil;
(2) sending the wastewater obtained by the step (1) into a dissolved air flotation machine, wherein the dissolved air flotation machine generates a large amount of micro-bubbles in the water, adsorbing unseparated and clean dispersed oil drops in the wastewater, and floating to sleep to further realize oil-water separation;
(3) the wastewater treated by the dissolved air floatation machine sequentially enters a facultative tank, an IC anaerobic tower, an aerobic tank and an aeration biological filter for biochemical treatment, and an organic matter in the wastewater can be effectively removed by a biochemical system constructed by the facultative tank, the IC anaerobic tower, the aerobic tank and the aeration biological filter;
(4) collecting the effluent of the biological aerated filter, and conveying the effluent to an ultrafiltration system for removing particulate matters;
(5) and conveying the produced water of the ultrafiltration system to a nanofiltration system for further advanced treatment, and finally enabling the quality of the effluent to reach the standard to realize recycling.
(6) In the process, concentrated water obtained by the ultrafiltration system and the nanofiltration system in the step (5) is conveyed to a facultative tank for circular treatment, so that zero discharge of wastewater is realized. The following table shows COD of wastewater in each stage of the centralized treatment method of the oily sewage of the ship.
Claims (3)
1. A centralized treatment method for oily sewage of ships is characterized by comprising the following steps:
(1) conveying the ship wastewater to a demulsification pool, adding a demulsifier, performing demulsification reaction at a certain temperature, and removing floating oil;
(2) sending the wastewater obtained by the step (1) into a dissolved air flotation machine, wherein the dissolved air flotation machine generates a large amount of micro-bubbles in the water, adsorbing unseparated and clean dispersed oil drops in the wastewater, and floating to sleep to further realize oil-water separation;
(3) the wastewater treated by the dissolved air floatation machine sequentially enters a facultative tank, an IC anaerobic tower, an aerobic tank and an aeration biological filter for biochemical treatment, and an organic matter in the wastewater can be effectively removed by a biochemical system constructed by the facultative tank, the IC anaerobic tower, the aerobic tank and the aeration biological filter;
(4) collecting the effluent of the biological aerated filter, and conveying the effluent to an ultrafiltration system for removing particulate matters;
(5) and conveying the produced water of the ultrafiltration system to a nanofiltration system for further advanced treatment, and finally enabling the quality of the effluent to reach the standard to realize recycling.
(6) In the process, concentrated water obtained by the ultrafiltration system and the nanofiltration system in the step (5) is conveyed to a facultative tank for circular treatment, so that zero discharge of wastewater is realized.
2. A centralized treatment system for oily sewage of ships is characterized by comprising an emulsion breaking tank, a dissolved air floatation machine, an oil recovery tank, a facultative tank, an IC anaerobic tower, a methane collection tank, an aerobic tank, an aeration biological filter, a water production tank, an ultrafiltration system and a nanofiltration system; the water outlet of the demulsification pool is communicated with the water inlet of the dissolved air flotation machine, the oil recovery pool is arranged on one side of the demulsification pool, the oil outlet at the top of the dissolved air flotation machine is communicated with the oil recovery pool, the water outlet of the dissolved air flotation machine is communicated with the water inlet at the upper part of the facultative tank, the water outlet of the facultative tank is communicated with the water inlet at the bottom of the IC anaerobic tower, the water outlet at the upper part of the IC anaerobic tower is connected with the water production pool through an aerobic pool and an aeration biological filter in sequence, and the gas; the water outlet of the water producing tank is communicated with the water inlet of the ultrafiltration system, the water producing port of the ultrafiltration system is communicated with the water inlet of the nanofiltration system, the water producing port of the nanofiltration system is communicated with the reuse water tank, and the concentrated water ports of the ultrafiltration system and the nanofiltration system are communicated with the facultative tank.
3. The centralized treatment system for oily sewage of ships according to claim 1, wherein a heating chamber is arranged outside the bottom of the demulsification pool, a burner is arranged in the heating chamber, a biogas collection tank is communicated with a burner pipeline in the heating chamber through a biogas purification device, and a flue gas pipe is arranged on the upper side of the heating chamber.
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| CN201911305261.3A CN110835209A (en) | 2019-12-18 | 2019-12-18 | Centralized treatment method and system for oily sewage of ship |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111547908A (en) * | 2020-05-20 | 2020-08-18 | 中国石油工程建设有限公司 | Method and device for recycling, treating and regenerating saline produced water of super-heavy oil |
| CN112387658A (en) * | 2020-11-26 | 2021-02-23 | 合肥毅行科技有限公司 | Automobile engine spare part clearance stores integration equipment |
| CN113045145A (en) * | 2021-05-07 | 2021-06-29 | 辰铭善川(重庆)科技发展有限公司 | Sequencing batch aeration sewage treatment system and method for ship |
| CN113264632A (en) * | 2021-04-16 | 2021-08-17 | 山东交通学院 | Treatment system and process for treating oil stain at bottom of cabin by using bionic fish gills |
-
2019
- 2019-12-18 CN CN201911305261.3A patent/CN110835209A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111547908A (en) * | 2020-05-20 | 2020-08-18 | 中国石油工程建设有限公司 | Method and device for recycling, treating and regenerating saline produced water of super-heavy oil |
| CN112387658A (en) * | 2020-11-26 | 2021-02-23 | 合肥毅行科技有限公司 | Automobile engine spare part clearance stores integration equipment |
| CN112387658B (en) * | 2020-11-26 | 2022-09-30 | 蔚蓝计划(北京)科技有限公司 | Automobile engine spare part clearance stores integration equipment |
| CN113264632A (en) * | 2021-04-16 | 2021-08-17 | 山东交通学院 | Treatment system and process for treating oil stain at bottom of cabin by using bionic fish gills |
| CN113264632B (en) * | 2021-04-16 | 2022-12-02 | 山东交通学院 | Treatment system and process for treating oil stain at bottom of cabin by using bionic fish gills |
| CN113045145A (en) * | 2021-05-07 | 2021-06-29 | 辰铭善川(重庆)科技发展有限公司 | Sequencing batch aeration sewage treatment system and method for ship |
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