CN101343095A - Ship bilge sewage treatment plant - Google Patents

Abstract

A ship bilge sewage treatment device belongs to the technical field of ship pollution prevention. Including coarse filter, centrifugal pump, oil-water separator, two-way flow ultrafiltration membrane separation module, heating cabinet, intermediate filter, fine filter, reciprocating pump, electromagnetic flowmeter, oil alarm monitoring recorder, clean water tank, chemical agent tank, control Units, check valves, 2/2 and 3/2 solenoid valves. When there is less emulsified oil in the bilge water, the device will make the water quality meet the standard through mechanical separation and filter filtration. When the bilge sewage contains a lot of emulsified oil, the device adds membrane separation components to filter on the basis of mechanical separation, so that the water quality meets the discharge standards. At the same time, measures such as pre-membrane water preheating, sewage flow control, clean water and chemical agent backwashing are adopted to reduce membrane pollution, ensure the operation of sewage treatment work, and prolong the service life of the membrane. It has significant economic and social benefits.

Description

Ship bilge sewage treatment plant

Technical field

The invention relates to a sewage treatment device, in particular to a ship bilge sewage treatment device, which belongs to the technical field of ship pollution prevention.

Background technique

In the traditional ship bilge water separation device, the separated permeate can meet the requirement that the oil concentration is lower than 15ppm. In the case of bilge sewage treatment, the traditional separation device can no longer meet the requirements. Among the existing oily water treatment technologies, there is no complete and simple device that can be economically and conveniently adapted to bilge water treatment in different situations. Among the existing technologies, the application number is 200420033137.9, and the utility model patent named "Inland River Ship Sewage Treatment Equipment" integrates sewage anaerobic treatment technology and sewage biological phosphorus and nitrogen removal technology. The solid waste storage room, the outlet pipe is connected to the UASB-Fe reaction chamber, and the pipeline is equipped with anoxic reaction chamber, aeration chamber, and sedimentation chamber, which occupy a large space, complex technology, and poor economy. Therefore, this device is not suitable for ship bilges Treatment of sewage, especially small ship bilge water. At present, the biochemical treatment equipment on the market generally has problems such as large volume, high infrastructure costs, and high operating costs: the application number is 200420031118.2, and the utility model patent named "membrane biochemical membrane sewage treatment equipment" is used to improve the treatment efficiency of sewage treatment equipment. method to realize the practicality of the device. But this device does not consider two problems: 1, the fouling problem of membrane. The price of the membrane is high, and the problem of membrane fouling is serious in long-term use. Certain measures must be taken to reduce membrane fouling. 2. When the emulsified oil component in the bilge water is less, only simple mechanical treatment is needed to meet the discharge requirements. If membrane filtration is still used at this time, it is obviously less economical, so this device is not suitable for modern ships, especially small ships Bilge water treatment; the application number is 200720072910.6, and the utility model patent named "Ultrafiltration Membrane Separation Device for Ship Oil-Water Separator" is mainly to add a set of ultrafiltration membrane device to the traditional mechanical separation, which can realize the separate membrane module , parallel, and series operation, but the device only uses clean water backwashing to reduce membrane fouling in the use of membranes. In the long-term use of the membrane, due to the irreversibility of membrane fouling, the colloid cannot be removed by relying on clean water backwashing, and chemical flushing must be used to restore the membrane flux, so this device has certain shortcomings.

Contents of the invention

In order to overcome the deficiencies and defects of the prior art, the present invention provides a ship bilge water treatment device. The device has two working states. When the emulsified oil component in the bilge water is less, the bilge water only needs simple mechanical separation and filter filtration to meet the discharge standard. When there are many emulsified oil components in the bilge water, after the bilge water is mechanically separated and filtered by a filter, membrane module filtration treatment is required to make the water quality meet the standard. In the use of the membrane, the device adopts measures such as heating pretreatment, pulsating input flow generated by the reciprocating pump, and sewage flow control to greatly reduce membrane pollution. benefit. In the use of the membrane, this device also adopts two measures of clean water and chemical agent backwash to restore the membrane flux. When the clean water backwash cannot fundamentally restore the membrane flux, chemical agent flushing is used to ensure the sewage treatment. of normal operation.

The present invention is achieved through the following technical solutions: the present invention includes a coarse filter, a first centrifugal pump, a second centrifugal pump, a third centrifugal pump, a first two-position three-way solenoid valve, and a second two-position three-way solenoid valve , the third two-position three-way solenoid valve, the fourth two-position three-way solenoid valve, the fifth two-position three-way solenoid valve, the sixth two-position three-way solenoid valve, the seventh two-position three-way solenoid valve, the eighth two-position solenoid valve Three-way solenoid valve, ninth two-position three-way solenoid valve, heater, temperature sensor, liquid level sensor, oil-water separator, intermediate filter, fine filter, first electromagnetic flowmeter, second electromagnetic flowmeter, heating cabinet, two-way Flow ultrafiltration membrane separation components, oil alarm monitoring recorder, clean water tank, chemical agent tank, two-position two-way solenoid valve, reciprocating pump, first one-way valve, second one-way valve, control unit. The inlet of the fine filter communicates with the bilge, and the outlet connects with port a of the first two-position three-way solenoid valve; port b of the first two-position three-way solenoid valve communicates with the lower inlet of the heating cabinet through the first centrifugal pump. The heating cabinet is equipped with heater, temperature sensor and liquid level sensor. The heating cabinet is provided with a sewage high point, an oil reservoir low point, and a sewage low point. The upper outlet of the oil layer low point of the heating cabinet communicates with the dirty oil tank through the second centrifugal pump and the two-position two-way electromagnetic valve. The inlet of the oil-water separator is connected to the outlet at the lower end of the heating cabinet through the second one-way valve, and at the same time, the inlet of the oil-water separator is connected to the c port of the first two-position three-way solenoid valve, and the outlet of the oil-water separator passes through an intermediate filter and a reciprocating pump , The fine filter is connected to port a of the second two-position three-way solenoid valve. Port b of the second two-position three-way solenoid valve is connected to port b of the sixth two-position three-way solenoid valve, and port c is connected to port a of the third two-position three-way solenoid valve through the first electromagnetic flowmeter. The upper port of the two-way flow ultrafiltration membrane separation module is respectively connected to the b port of the third two-position three-way solenoid valve and the b-port of the fifth two-position three-way solenoid valve, and the lower port of the two-way flow ultrafiltration membrane separation component is connected to the third two-way three-way solenoid valve. The c-port of the one-position three-way solenoid valve is connected to the c-port of the fifth two-position three-way solenoid valve. Port b and port c of the fourth two-position three-way solenoid valve are respectively connected to the upper and lower outlets of the two-way flow ultrafiltration membrane separation module, and port a is connected to port b of the seventh two-position three-way solenoid valve. Port a of the seventh two-position three-way solenoid valve is connected to port b of the eighth two-position three-way solenoid valve through the third centrifugal pump, and port c is connected to port a of the sixth two-position three-way solenoid valve. The c-port and a-port of the eighth two-position three-way solenoid valve are respectively connected with the outlets of the clean water tank and the chemical agent tank. The c-port of the sixth two-two three-way solenoid valve is connected to the b-port of the ninth two-two-three-way solenoid valve through the oil alarm monitoring recorder, and the c-port of the ninth two-two three-way solenoid valve is connected to the The sea is connected. Port a of the fifth two-position three-way solenoid valve is connected to the inlet at the lower end of the heating cabinet through the first one-way valve and the port a of the ninth two-position three-way solenoid valve. The input terminal of the control unit is electrically connected with the output terminals of the first electromagnetic flowmeter, the second electromagnetic flowmeter, the temperature sensor and the liquid level sensor, and the output terminals of the control unit are all connected with two-position two-way solenoid valves, reciprocating pumps, nine two-position The three-way electromagnetic valve and the control terminals of the three centrifugal pumps are electrically connected.

Under the action of the control unit, the bilge sewage is firstly filtered through the coarse filter, then mechanically separated into the oil-water separator, and then filtered through the intermediate filter and the fine filter. The filtered liquid is detected by the oil monitoring alarm recorder. If it meets the national discharge standard are discharged into the sea. If the discharge standard is not met, the liquid will be discharged into the heating cabinet, and the liquid flowing out of the coarse filter will be pumped into the heating cabinet to be heated by the heater to 50 degrees Celsius, and the oil floating in the heating cabinet will be discharged into the dirty oil tank, and the remaining oil in the heating cabinet After the sewage is mechanically separated by the oil-water separator, filtered by the intermediate filter and the fine filter, then filtered by the two-way flow ultrafiltration membrane separation module, and then enters the oil alarm monitoring recorder for detection. If it meets the discharge standard, it will be discharged into the sea, otherwise it will be discharged into the sea. Heating cabinet. After the membrane has been filtered for a period of time, it must be backwashed with clean water to reduce membrane fouling and restore membrane flux. When it is found that the backwashing effect of clear water is not good, use chemical backwashing.

The beneficial effects of the present invention are: adopting the ship bilge water treatment device, when the emulsified oil component is less, the discharge requirement can only be met through mechanical separation and filter filtration. When the emulsified oil has more components, the filtration of the two-way flow ultrafiltration membrane separation module is added on the basis of mechanical separation and filter filtration. The pollution of the membrane is reduced through heating pretreatment of sewage, pulsating flow generated by the reciprocating pump and other measures, and the heating pretreatment also enables the recovery and utilization of slick oil. Due to the use of chemical flushing in the case of poor backwashing effect of clean water, the recovery of membrane flux is ensured and the normal operation of sewage treatment is maintained. The device has a simple structure and a small volume, can be adapted to the treatment of bilge sewage of various ships, and has high economic and social benefits.

Description of drawings

Fig. 1 is a structural schematic diagram of a ship bilge sewage treatment device of the present invention.

In the figure: 1. Coarse filter, 2. The first centrifugal pump, 3. The second centrifugal pump, 4. The third centrifugal pump, 5. The first two-position three-way solenoid valve, 6. The second two-position three-way solenoid valve , 7. The third two-position three-way solenoid valve, 8. The fourth two-position three-way solenoid valve, 9. The fifth two-position three-way solenoid valve, 10. The sixth two-position three-way solenoid valve, 11. The seventh two-way solenoid valve Three-position solenoid valve, 12. Eighth two-position three-way solenoid valve, 13. Ninth two-position three-way solenoid valve, 14. Heater, 15. Temperature sensor, 16. Liquid level sensor, 17. Oil-water separator, 18. Intermediate filter, 19. Fine filter, 20. First electromagnetic flowmeter, 21. Second electromagnetic flowmeter, 22. Heating cabinet, 23. Two-way flow ultrafiltration membrane separation component, 24. Oil alarm monitoring recorder, 25. Clean water tank, 26. Chemical agent tank, 27. Two-position two-way solenoid valve, 28. Reciprocating pump, 29. First one-way valve, 30. Second one-way valve, 31. Control unit.

Detailed ways

The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the present invention includes a coarse filter 1, a first centrifugal pump 2, a second centrifugal pump 3, a third centrifugal pump 4, a first two-position three-way solenoid valve 5, and a second two-position three-way solenoid valve 6 , The third two-position three-way solenoid valve 7, the fourth two-position three-way solenoid valve 8, the fifth two-position three-way solenoid valve 9, the sixth two-position three-way solenoid valve 10, the seventh two-position three-way solenoid valve 11 , the eighth two-position three-way solenoid valve 12, the ninth two-position three-way solenoid valve 13, the heater 14, the temperature sensor 15, the liquid level sensor 16, the oil-water separator 17, the intermediate filter 18, the fine filter 19, the first electromagnetic Flow meter 20, second electromagnetic flow meter 21, heating cabinet 22, two-way flow ultrafiltration membrane separation module 23, oil alarm monitoring recorder 24, clean water tank 25, chemical agent tank 26, two-position two-way solenoid valve 27, reciprocating Pump 28 , first one-way valve 29 , second one-way valve 30 , control unit 31 . The inlet of the fine filter 1 communicates with the bilge, the outlet is connected to the a port of the first two-position three-way solenoid valve 5, and the b-port of the first two-position three-way solenoid valve 5 passes through the lower end of the first centrifugal pump 2 and the heating cabinet 22 Imports are interlinked. The heating cabinet 22 is equipped with a heater 14 , a temperature sensor 15 and a liquid level sensor 16 . The heating cabinet 22 is provided with a sewage high point, an oil reservoir low point, and a sewage low point. The upper outlet of the oil layer low point of the heating cabinet 22 communicates with the dirty oil tank through the second centrifugal pump 3 and the two-position two-way solenoid valve 27. The inlet of the oil-water separator 17 communicates with the outlet of the lower end of the heating cabinet 22 through the second one-way valve 30. Intermediate filter 18, reciprocating pump 28, fine filter 19 are connected to port a of the second two-position three-way valve 6, port b of the second two-position three-way valve 6 is connected to port b of the sixth two-position three-way valve 10, Port c is connected to port a of the third two-position three-way solenoid valve 7 through the first electromagnetic flowmeter 20 . The upper port of the two-way flow ultrafiltration membrane separation assembly 23 is connected with the b port of the third two-position three-way electromagnetic valve 7 and the b port of the fifth two-position three-way electromagnetic valve 9 respectively, and the lower port of the two-way flow ultrafiltration membrane separation assembly 23 It is connected with the c-port of the third two-position three-way solenoid valve 7 and the c-port of the fifth two-position three-way solenoid valve 9 . Port b and port c of the fourth two-position three-way solenoid valve 8 are respectively connected to the upper and lower outlets of the bidirectional flow ultrafiltration membrane separation module 23 , and port a is connected to port b of the seventh two-position three-way solenoid valve 11 . Port a of the seventh two-position three-way solenoid valve 11 is connected to port b of the eighth two-position three-way solenoid valve 12 through the third centrifugal pump 4, and port c is connected to port a of the sixth two-position three-way solenoid valve 10 . The c-port and a-port of the eighth two-position three-way solenoid valve 12 are respectively connected with the outlets of the clean water tank 25 and the chemical agent tank 26 . The c-port of the sixth two-position three-way solenoid valve 10 is connected to the b-port of the ninth two-position three-way solenoid valve 13 through the oil alarm monitoring recorder 24, and the c-port of the ninth two-position three-way solenoid valve 13 is connected through the second The electromagnetic flowmeter communicates with the sea. The a port of the fifth two-position three-way solenoid valve (9) is connected with the lower end inlet of the heating cabinet (22) through the first one-way valve (29) and the a-port of the ninth two-position three-way solenoid valve (13). The input end of the control unit 31 is electrically connected to the output ends of the first electromagnetic flowmeter 20, the second electromagnetic flowmeter 21, the temperature sensor 15 and the liquid level sensor 16, and the output end of the control unit 31 is connected to the two-position two-way solenoid valve 27, the reciprocating The control terminals of the pump 28, nine two-position three-way solenoid valves, and three centrifugal pumps are electrically connected.

When there is less emulsified oil in the bilge water, the device enters the first working state at this moment. Bilge water only needs to be mechanically separated and filtered to meet the standard. At this time, the control unit 31 controls the connection between port a and port c of the first two-position three-way valve 5, the connection between port a and port b of the second two-position three-way solenoid valve 6, and the connection between the port a and port b of the sixth two-position three-way solenoid valve 10. The port b and port c are connected and the reciprocating pump 28 is started. After the bilge water passes through the coarse filter 1, it enters the oil-water separator 17 for mechanical separation. Alarm monitoring recorder 24 detects. If the discharge standard is met, the controller 31 controls the port b and port c of the ninth two-position three-way solenoid valve 13 to be connected, and the detected liquid is discharged into the sea through the second electromagnetic flowmeter 21 . If the detection does not meet the discharge standard, the control unit 31 controls the b port and a port of the ninth two-position three-way solenoid valve 13 to be connected, and the detected liquid enters the heating cabinet 22 . Now enter the second working state of the device.

When there are many emulsified oil components in the bilge water, the requirements cannot be met only through mechanical separation and filter filtration, and the device enters the second working state. At this time, the control unit 31 controls the operation of the first centrifugal pump 2 , the port a and port b of the first two-position three-way solenoid valve 5 are connected, and the liquid filtered by the coarse filter 1 enters the heating cabinet 22 . When the liquid level sensor 16 shows that the liquid level reaches the high point of sewage in the heating cabinet 22, the control unit 31 controls the first centrifugal pump 2 to stop working, and the heater 14 works, and the sewage is heated in the heating cabinet 22 at this time. When the temperature sensor 15 shows that the temperature reaches 50 degrees Celsius, the control unit 31 controls the heater 14 to stop heating, controls the two-position two-way solenoid valve 27 to connect, and the second centrifugal pump 3 starts. At this time, the oil layer floating in the heating cabinet 22 enters the sewage. in the oil tank. When the liquid level sensor 16 shows that the liquid level of the heating cabinet 22 has dropped to the set low point of the oil layer, the control unit 31 controls the second centrifugal pump 3 to stop working, and the a port and the c port of the second two-position three-way solenoid valve 6 are connected. port a and port b of the third two-position three-way solenoid valve 7 are connected, port a and port c of the fourth two-position three-way solenoid valve 8 are connected, port b and port b of the seventh two-position three-way solenoid valve are connected Port c is connected, port a and port c of the sixth two-position three-way solenoid valve 10 are connected, port c and port a of the fifth two-position three-way solenoid valve 9 are connected. Driven by the reciprocating pump 28, the lower outlet of the heating cabinet 22 passes through the oil-water separator 17, the intermediate filter 18, the fine filter 19, and the first electromagnetic flowmeter 20 enters the upper inlet of the two-way flow ultrafiltration membrane separation module 23, and the permeate flows from the two-way The lower end of the ultrafiltration membrane separation module 23 exits and enters the oil alarm monitoring recorder 24 for detection. The concentrated liquid enters the heating cabinet 22 from the lower port of the two-way flow ultrafiltration membrane separation module 23 for further treatment. If the permeate is detected by the oil alarm monitoring recorder 24 and meets the discharge standard, the controller 31 controls the b port and the c port of the ninth two-position three-way solenoid valve 13, and the permeate is discharged into the sea through the second electromagnetic flowmeter 21. Otherwise, the control unit 31 controls the port b of the ninth two-position three-way solenoid valve 13 to communicate with the port a, and the permeate enters the heating cabinet 22 for further processing. After the two-way flow ultrafiltration membrane separation assembly 23 runs for a period of time, the controller 31 controls the a port and the c port of the third two-position three-way solenoid valve 7 to be connected, and the a port and the b port of the fourth two-position three-way solenoid valve 8 are connected. The port is connected, and the b port and a port of the fifth two-position three-way solenoid valve 9 are connected. Sewage coming in from the fine filter 19 enters the lower port of the two-way flow ultrafiltration membrane module 23, and the permeate enters the oil alarm monitoring recorder 24 from the upper outlet of the two-way flow ultrafiltration membrane separation module 23 for detection. The concentrated liquid enters the heating cabinet 22 through the upper port of the two-way flow ultrafiltration membrane module 23 .

When the liquid level sensor 16 shows that the sewage in the heating cabinet 22 is lowered to the low point of the sewage in the heating cabinet 22, the control unit 31 controls the reciprocating pump 28 to stop working. If there is still bilge water to be treated, then the bilge water is pumped into the heating cabinet 22 again for heat treatment, and the above-mentioned second state working process is repeated; otherwise, stop working.

Regarding flow control. When using the two-way flow ultrafiltration membrane separation module 23, the reciprocating pump 28 will be controlled by the control unit 31 so that the first electromagnetic flowmeter 20 shows that the sewage flow is maintained at 1/2 of the critical flux of the selected membrane material to reduce Membrane fouling.

Regarding temperature control. When the two-way flow ultrafiltration membrane separation assembly 23 is working, when the temperature sensor 15 shows that the sewage temperature in the heating cabinet 22 drops to 45 degrees Celsius, the control unit 31 controls the heater 14 to work, and when the temperature sensor 15 shows that the sewage temperature rises to 50 degrees Celsius When, the control unit 31 controls the heater 14 to stop working,

Regarding membrane flushing. Membrane flushing includes water flushing and chemical agent flushing.

When the use time of the membrane module reaches 30 minutes or the oil alarm monitoring recorder 24 alarms or the second electromagnetic flowmeter 21 shows that the flow rate drops by 15% of the predetermined permeate flow rate, clean water backwashing is performed. When the sewage enters from the upper port of the two-way flow ultrafiltration membrane separation module 23 and needs to be backwashed, the control unit 31 controls the c port and the b port of the eighth two-position three-way solenoid valve 12 to be connected, and the seventh two-position three-way solenoid valve 11 Port a and port b of the fourth two-position three-way solenoid valve 8 are connected, port a and port c of the fourth two-position three-way solenoid valve 8 are connected, port b and port a of the fifth two-position three-way solenoid valve 9 are connected, and the third centrifugal pump 4 start up. Driven by the third centrifugal pump 4 , the clean water in the clean water tank 25 enters the two-way flow film assembly 23 from the lower port of the two-way flow film assembly 23 for backwashing, and the flushed sewage enters the heating cabinet 22 . When the sewage enters from the lower port of the two-way flow ultrafiltration membrane separation module 23 and needs to be backwashed, the control unit 31 controls the c port and the b port of the eighth two-position three-way solenoid valve 12 to be connected, and the seventh two-position three-way solenoid valve 11 port a and port b of the fourth two-position three-way solenoid valve 8 are connected, port a and port b of the fourth two-position three-way solenoid valve 8 are connected, and port c and port a of the fifth two-position three-way solenoid valve 9 are connected. The clean water in the clean water tank 25 is driven by the third centrifugal pump 4 and enters the two-way flow ultrafiltration membrane separation module 23 for backwashing, and the washed liquid enters the heating cabinet through the c port and a port of the fifth two-position three-way solenoid valve 9 twenty two.

When the alarm time interval of the oil alarm monitoring recorder 24 is reduced by 1/3 than the set value or the timer of the second electromagnetic flowmeter 21 shows that the flow rate is reduced by 15%, the time interval is reduced by 1/3, and chemical flushing is adopted. The control unit 31 controls port a and port b of the eighth two-position three-way solenoid valve to communicate, and the rest of the backwash path is the same as the clear water backwash path.

The two-way flow ultrafiltration membrane separation module 23 adopts the MT series UIF910-AP-a type two-way flow hollow fiber ultrafiltration membrane module anti-pollution ultrafiltration membrane produced by Tianjin Gongda Membrane Group; the oil alarm monitoring recorder 24 adopts Jiujiang The XOC-0115ppm bilge water alarm device of Gongchuang Machinery Equipment Co., Ltd.; the chemical solvent in the chemical agent box is hydrochloric acid, citric acid, potassium hydroxide or sodium hydroxide.

Claims (2)

1. device for treating waste water at watercraft bilge, comprise strainer (1), first impeller pump (2), second impeller pump (3), the 3rd impeller pump (4), the first two-bit triplet magnetic valve (5), the second two-bit triplet magnetic valve (6), the 3rd two-bit triplet magnetic valve (7), the 4th two-bit triplet magnetic valve (8), the 5th two-bit triplet magnetic valve (9), the 6th two-bit triplet magnetic valve (10), the 7th two-bit triplet magnetic valve (11), the 8th two-bit triplet magnetic valve (12), the 9th two-bit triplet magnetic valve (13), well heater (14), temperature sensor (15), liquid level sensor (16), water-and-oil separator (17), middle filter (18), secondary filter (19), first magnetic flow meter (20), second magnetic flow meter (21), heating cabinet (22), bidirectional flow ultra-filtration membrane separation assembly (23), oil content alert detecting registering instrument (24), filtered water tank (25), chemical agent case (26), 2/2-way magnetic valve (27), reciprocation pump (28), first check valve (29), second check valve (30), control unit (31), the import that it is characterized in that secondary filter (1) communicates with the bilge, and outlet is connected with a port of the first two-bit triplet magnetic valve (5); The b port of the first two-bit triplet magnetic valve (5) is connected with the lower end import of heating cabinet (22) by first impeller pump (2); Heating cabinet (22) is furnished with well heater (14), temperature sensor (15) and liquid level sensor (16); Heating cabinet (22) is provided with a high site of sewage, an oil reservoir low points, a sewage low points, and the top outlet of the oil reservoir low points of heating cabinet (22) communicates with wiper tank by second impeller pump (3), 2/2-way magnetic valve (27); The import of water-and-oil separator (17) is connected with the lower end outlet of heating cabinet (22) by second check valve (30), the import of water-and-oil separator (17) and the c port of the first two-bit triplet magnetic valve (5) are connected simultaneously, and the outlet of water-and-oil separator (17) is connected with a port of the second two-bit triplet magnetic valve (6) by middle filter (18), reciprocation pump (28), secondary filter (19); The b port of the second two-bit triplet magnetic valve (6) is connected with the b port of the 6th two-bit triplet magnetic valve (10), and the c port is connected with a port of the 3rd two-bit triplet magnetic valve (7) by first magnetic flow meter (20); The upper port of bidirectional flow ultra-filtration membrane separation assembly (23) is connected with the b port of the 3rd two-bit triplet magnetic valve (7) and the b port of the 5th two-bit triplet magnetic valve (9) respectively, and bidirectional flow ultra-filtration membrane separation assembly (23) lower port is connected with the c port of the 3rd two-bit triplet magnetic valve (7) and the c port of the 5th two-bit triplet magnetic valve (9) respectively; The b port of the 4th two-bit triplet magnetic valve (8) is connected with the outlet up and down of bidirectional flow ultra-filtration membrane separation assembly (23) respectively with the c port, and a port is connected with the 7th two-bit triplet magnetic valve (11) b port; The 7th two-bit triplet magnetic valve (11) a port is connected with the b port of the 8th two-bit triplet magnetic valve 12 by the 3rd impeller pump (4), and the c port is connected with a port of the 6th two-bit triplet magnetic valve (10); The c port of the 8th two-bit triplet magnetic valve (12) is connected with the outlet of filtered water tank (25) with chemical agent case (26) respectively with a port; The c port of the 6th two-bit triplet magnetic valve (10) is connected with the b port of the 9th two-bit triplet magnetic valve (13) by oil content alert detecting registering instrument (24); The c port of the 9th two-bit triplet magnetic valve (13) communicates with the sea by second magnetic flow meter; The a port of the 5th two-bit triplet magnetic valve (9) all is connected with heating cabinet (22) lower end import by a port of first check valve (29) and the 9th two-bit triplet magnetic valve (13); The input terminus of control unit (31) is electrically connected with the output terminal of first magnetic flow meter (20), second magnetic flow meter (21), temperature sensor (15), liquid level sensor (16) respectively, and control unit (31) output terminal is electrically connected with the control end of 2/2-way magnetic valve (27), reciprocation pump (28), 9 two-bit triplet magnetic valves, 3 impeller pumps respectively.

2. device for treating waste water at watercraft bilge according to claim 1 is characterized in that described bidirectional flow ultra-filtration membrane separation assembly (23) is the MT series UIF910-AP-a type bidirectional flow polysulfone hollow fiber ultrafiltration membrane system antipollution type ultra-filtration membrane that adopts the big film of Tianjin worker sky film group to produce; Oil content alert detecting registering instrument (24) is the limber water warning device that adopts the XOC-0115ppm type of Jiujiang Gongchuang Machinery ﹠ Equipment Co., Ltd.'s production.

3, according to the device for treating waste water at watercraft bilge under the claim 1, it is characterized in that the chemical solvents in the described chemical agent case (26) is to adopt hydrochloric acid, citric acid, potassium hydroxide or sodium hydroxide.

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