CN117735748A

CN117735748A - Method for treating phenol-ammonia wastewater in short process

Info

Publication number: CN117735748A
Application number: CN202311632691.2A
Authority: CN
Inventors: 段文龙; 阮文权; 阮鹿凡
Original assignee: Jiangsu Masheng Biotechnology Co ltd
Current assignee: Jiangsu Masheng Biotechnology Co ltd
Priority date: 2023-12-01
Filing date: 2023-12-01
Publication date: 2024-03-22

Abstract

The invention discloses a method for treating phenol-ammonia wastewater in a short process, which comprises the following steps: s1: the phenolic ammonia wastewater enters a natural sedimentation tank for natural sedimentation; s2: s1, enabling clear liquid effluent in the middle to enter a cyclone separation tank for cyclone separation; s3: s2, the clear liquid effluent in the middle enters an oil removal filter; s4: s3, the filtered water at the bottom of the S3 enters a negative pressure deamination tower for deamination after the pH value is regulated; s5: the deamination effluent enters a multi-effect evaporator for evaporation after the pH value is regulated; s6: delivering the multi-effect evaporation effluent to a membrane system, wherein the water yield of the membrane system is more than 92%, and the concentrated water returns to a multi-effect evaporator to be evaporated; s7: and conveying the evaporation concentrate to a scraper evaporator for evaporation, wherein the evaporation water is more than 95%, the evaporation water returns to the multi-effect evaporator for evaporation, and the evaporated crystal liquid is centrifuged to obtain crude phenol sodium salt crystals. The method for treating the phenol-ammonia wastewater in a short process provided by the invention has the advantages that the produced water of a membrane system is more than 92%, and the content of each pollutant in the produced water is greatly reduced.

Description

Method for treating phenol-ammonia wastewater in short process

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a method for treating phenol-ammonia wastewater in a short process.

Background

The phenol-ammonia wastewater is organic wastewater with high COD, high ammonia nitrogen and high phenol degradation resistance and toxicity, which is generated in the production process of semi-coke, in the coal chemical industry, the wastewater has extremely strong inhibition and toxicity effects on biochemical bacteria, the biochemical treatment difficulty is extremely high, and the wastewater treatment is extremely focused and encouraged in the current environmental protection field.

At present, oil removal, deamination, extraction and biochemistry are mainly adopted for treating phenolic ammonia wastewater, wherein most enterprises or researchers focus on biochemistry after reducing ammonia nitrogen and phenol content in wastewater or adopt a multi-stage oxidation mode to solve the biochemistry problem, but a plurality of methods focus on biochemistry have the problems of long flow, high biochemical treatment requirement, high difficulty and high cost, are extremely easy to be influenced by water quality change and outside air temperature, and have the problems of unqualified water outlet, reduced performance, reduced water yield and reduced water quality of produced water after a membrane system is used for a long time.

Disclosure of Invention

In view of this, the invention provides a method for the short-process treatment of phenol-ammonia wastewater.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

a method for treating phenol-ammonia wastewater in a short process comprises the following steps:

s1: the phenolic ammonia wastewater generated in the production process enters a natural sedimentation tank for natural sedimentation, the natural sedimentation tank is arranged in series in multiple stages, the temperature is controlled to be 35-40 ℃, the retention time is 7-10 d, and water is discharged from the middle;

s2: in the step S1, the final-stage middle clear liquid effluent enters a cyclone separating tank for cyclone separation, the cyclone separating tank is arranged in parallel in multiple stages, the temperature is controlled to be 40-50 ℃, the residence time is controlled to be 2-3 d, and the middle effluent is discharged;

S3: in the step S2, the middle clear liquid effluent enters an oil removal filter, the oil removal filters are arranged in parallel in multiple stages, the bottom is filtered to obtain effluent, and the petroleum in the filtered effluent is less than or equal to 10mg/L;

s4: the filtered water at the bottom in the step S3 enters a negative pressure deamination tower for deamination after pH adjustment and preheating, and ammonia nitrogen in the deamination water is less than or equal to 8mg/L;

s5: the deamination effluent in the step S4 enters a multi-effect evaporator for evaporation after the pH value is regulated, COD in the evaporation effluent is less than or equal to 50mg/L, and volatile phenol is less than or equal to 10mg/L;

s6: delivering the multi-effect evaporation effluent in the step S5 to a membrane system, wherein the produced water of the membrane system is more than 92%, COD (chemical oxygen demand) in the produced water is less than or equal to 50mg/L, volatile phenol is less than or equal to 0.3mg/L, petroleum is less than or equal to 2.5mg/L, ammonia nitrogen is less than or equal to 8mg/L, and returning the concentrated water to the multi-effect evaporator in the step S5 for evaporation;

s7: and (5) conveying the evaporation concentrate in the step (S5) to a scraper evaporator for evaporation, wherein more than 95% of evaporation water is discharged, returning the evaporation water to the step (S5) for evaporation in the multi-effect evaporator, and centrifuging the evaporation crystal liquid to obtain crude phenol sodium salt crystals.

Preferably, the oil removing filter in the step S3 is a walnut skin filter or a fiber cotton filter; the fiber cotton in the fiber cotton filter is a prefilming modified polypropylene material, and the oil absorption is 1.89g/L.

Preferably, in the step S4, the negative pressure of the negative pressure deamination tower is controlled to be between-0.07 MPa and-0.08 MPa.

Preferably, in the step S4, the pH of the filtered water is adjusted to be 12 before entering the tower, or to be 12 in the middle of the deamination tower; in the step S5, the deamination effluent is adjusted to pH 12 to 12.5.

Preferably, in the step S5, the multiple-effect evaporator is a two-effect evaporator or a three-effect evaporator, and the concentration multiple of the multiple-effect evaporator is 10-20 times.

Preferably, the multi-effect evaporator is a two-effect evaporator, wherein the temperature of the one-effect evaporator is less than or equal to 60 ℃, the negative pressure is less than or equal to-0.08 MPa, the evaporation intensity is less than or equal to 20L/square meter h, the temperature of the two-effect evaporator is less than or equal to 41.5 ℃, the negative pressure is less than or equal to-0.092 MPa, and the evaporation intensity is less than or equal to 12.5L/square meter h.

Preferably, in the step S6, the membrane system is an RO membrane, the working temperature is less than or equal to 50 ℃, and the working pressure is 4.5MPa.

Preferably, in the step S7, the concentration multiple of the scraper evaporator is 15-30 times.

The invention also provides a phenol-ammonia wastewater short-process treatment system which comprises three multistage natural settling tanks, three cyclone separation tanks, two oil removal filters, a preheater, a negative pressure deamination tower, a condenser, a recycling concentration device, an adjusting preheater, a deamination water outlet tank, a condensation tank, a one-effect heater, a one-effect separator, a two-effect heater, a two-effect separator, a two-effect condenser, a condensation water tank, two vacuum units, a condensation liquid tank, a scraper thickener, a scraper condenser, a scraper condensation tank, a kettle residue liquid tank, an evaporation water outlet tank, a membrane system and a concentrate tank;

The phenol-ammonia wastewater flows into a first multi-stage natural settling tank through a pipeline, wherein the middle clear liquid of the first multi-stage natural settling tank is connected with a second multi-stage natural settling tank through a pipeline, and the middle clear liquid of the second multi-stage natural settling tank is connected with a third multi-stage natural settling tank through a pipeline; the upper layer floating oil of the three multi-stage natural settling tanks is collected, and the lower layer sediment of the three multi-stage natural settling tanks is collected;

the middle clear liquid of the third multistage natural settling tank is respectively connected with the three cyclone separation tanks through pipelines; the middle clear liquid of the three cyclone separating tanks is respectively connected with two oil removing filters through pipelines; the upper layer floating oil of the three cyclone separating tanks is collected, and the lower layer sediment of the three cyclone separating tanks is collected;

the oil removal filtered water obtained by filtering the two oil removal filters is respectively connected with the preheater through a pipeline; the preheater is connected with the negative pressure deamination tower through a pipeline;

the ammonia-containing steam of the negative pressure deamination tower is connected with the condenser through a pipeline, the negative pressure deamination tower is filled with steam through a pipeline, and deamination effluent of the negative pressure deamination tower is connected with the deamination effluent tank through a pipeline; ammonia gas of the ammonia-containing steam of the negative pressure deamination tower is connected with the recovery concentration device through a pipeline after passing through the condenser, condensed liquid of the ammonia-containing steam enters the condensation tank, and the condensed liquid in the condensation tank is connected with the negative pressure deamination tower through the pipeline; the recovery concentration device discharges ammonia water;

The deamination effluent tank is connected with the regulating preheater through a pipeline; the deamination effluent of the regulating preheater is connected with an effective heater through a pipeline; one side inlet of the primary heater is communicated with steam through a pipeline, one side outlet of the primary heater is used for discharging steam condensate through a pipeline, and the other side outlet of the primary heater is used for conveying primary secondary steam into the primary separator through a pipeline; the top outlet of the first-effect separator is used for conveying the first-effect secondary steam into the second-effect heater through a pipeline; the outlet at the upper end of the other side of the two-effect heater is used for conveying the two-effect secondary steam into the two-effect separator, and the outlet at the lower end of the other side is used for conveying the one-effect condensate water into the two-effect separator; the top end outlet of the secondary separator conveys secondary steam to a secondary condenser; the bottom outlet of the first-effect separator is used for conveying the first-effect concentrated solution to the first-effect heater and the second-effect heater respectively through pipelines; the bottom outlet of the secondary separator is used for conveying the secondary concentrated solution to the secondary heater through a pipeline; the two-effect separator conveys the evaporated concentrated solution into the concentrated solution tank through a pipeline;

the double-effect condenser conveys noncondensable gas to a vacuum unit through a pipeline; the double-effect condenser conveys double-effect condensed water into a condensed water tank through a pipeline; the condensate water tank conveys the evaporated water to the evaporation water tank through a pipeline; the evaporation water outlet tank conveys evaporation water to the membrane system through a pipeline; the membrane system discharges final produced water through a pipeline; the membrane system conveys the concentrated water into a concentrated water tank through a pipeline; the concentrated water tank conveys concentrated water into the deamination water outlet tank through a pipeline;

The concentrated solution tank conveys the evaporated concentrated solution to the scraper concentrator through a pipeline; light component steam in the operation process of the scraper concentrator is conveyed into the scraper condenser through a pipeline, and heavy component evaporation crystallization liquid in the operation process of the scraper concentrator is conveyed into a kettle residual liquid tank through a pipeline; the scraper condenser conveys non-condensable gas into the vacuum unit through a pipeline, and the scraper condenser conveys scraper condensate into the scraper condensing tank through a pipeline; the scraper condensing tank conveys scraper condensate to the deamination water outlet tank through a pipeline;

preferably, the membrane system comprises a bag filter and a membrane device; the evaporation outlet water of the evaporation water tank is connected with the bag filter through a first pipeline, and a feed pump is arranged on the first pipeline; the bag filter is connected with the membrane device through a second pipeline, and a booster pump is arranged on the second pipeline;

the membrane device comprises an outer shell, a central tube, a first inner shell, a second inner shell, an annular first extension shell, an annular second extension shell, a water purification baffle, a cleaning fluid baffle, a driving assembly, an evaporation water outlet inlet tube, a waste liquid outlet tube, a cleaning fluid inlet tube, a cleaning fluid outlet tube and an RO membrane; the central tube, the first inner shell, the second inner shell and the outer shell are sequentially arranged from inside to outside, and a water purifying space, a cleaning liquid space and an RO membrane installation space are respectively formed between the central tube and the first inner shell, between the first inner shell and the second inner shell and between the first inner shell and the outer shell;

A plurality of RO membranes are uniformly arranged in the RO membrane space along the inner circumferential surface of the shell, and a second installation space is reserved between every two adjacent RO membranes;

the center tube is provided with a first inner shell outside; the first inner shell is composed of an annular first main shell and a plurality of U-shaped first extension shells which are uniformly and outwards projected on the circumferential surface of the annular first main shell; the top end and the bottom end of each U-shaped first extension shell are provided with a first top sealing plate and a first bottom sealing plate; a first installation space is formed between the outer parts of every two adjacent U-shaped first extension shells, the inner part of each U-shaped first extension shell is communicated with the water purification space, and each first installation space is communicated with the second installation space to form a cleaning liquid passing space; the outer circumferential surfaces of the plurality of U-shaped first extension shells are respectively adhered to the RO membranes; the end surfaces of the U-shaped first extension shells, which are attached to the RO membrane, are respectively provided with a plurality of water purifying through holes;

the second inner shell is composed of a plurality of second main shells, a U-shaped second extension shell which is arranged on each second main shell in an outward protruding mode, and an annular bottom shell arranged at the lower end of each second main shell; the top end and the bottom end of each U-shaped second extension shell are provided with a second top sealing plate and a second bottom sealing plate; in each cleaning liquid passing space, the second main shell is matched and attached with the first installation space, the U-shaped second extension shell is matched and attached with the second installation space, and the annular bottom shell is attached with the bottom ends of a plurality of RO membranes; a plurality of first cleaning solution through holes are respectively formed in the end face of one side of the U-shaped second extension shell, which is attached to the RO membrane; the annular bottom shell is an annular shell with a plurality of wastewater through grooves along the circumferential direction, and the wastewater through grooves correspond to the RO membranes respectively; the inside of the annular bottom shell is hollow, a cleaning solution passing groove communicated with the inside of the annular bottom shell is formed in the inner side of the upper plate of the annular bottom shell corresponding to the first installation space, a plurality of rows of second cleaning solution through holes are formed in the outer side of the upper plate of the annular bottom shell corresponding to the RO membrane positions respectively, and the rows of second cleaning solution through holes and the wastewater passing grooves are distributed in a staggered mode;

The upper end of the first main shell is provided with an annular first extension shell, and a plurality of first arc-shaped baffle through grooves are uniformly formed in the annular first extension shell along the side circumferential surface direction of the annular first extension shell; the upper end of the second main shell is provided with an annular second extension shell, a plurality of second arc-shaped baffle grooves are uniformly formed in the annular second extension shell along the side circumferential surface direction of the annular second extension shell, a blocking baffle is arranged at the position, corresponding to the second arc-shaped baffle grooves, of the upper end of the annular second extension shell, and the blocking baffle completely covers the plurality of second arc-shaped baffle grooves;

the top end of the shell is provided with a shell top cover plate, the bottom end of the shell is provided with a shell bottom plate, and the shell top cover plate is provided with a central hole; a liquid inlet space is reserved between the RO membranes and the top cover plate of the shell, and a liquid outlet space is reserved between the bottom plate of the shell and the annular bottom shell;

the central tube, the annular first extension shell and the annular second extension shell extend out of the central hole, and the outer wall of the annular second extension shell is attached to the inner wall of the central hole; the top ends of the central pipe and the annular first extension shell are respectively provided with a central pipe top cover plate and an annular first extension shell top cover plate; the space between the annular first extending shell and the annular second extending shell is a cleaning liquid entering space, and a cleaning liquid top cover plate is arranged at the top end of the cleaning liquid entering space; the lower end of the first main shell is provided with an annular third extension shell, the inner wall and the outer wall of the annular bottom shell are respectively connected with the outer wall of the annular third extension shell and the inner wall of the shell, and the inner wall of the shell bottom plate is connected with the outer wall of the annular third extension shell; the heights of the annular first extension shell top cover plates are higher than the heights of the central tube top cover plates and the cleaning liquid top cover plates; the height of the cleaning fluid top cover plate is higher than that of the shell top cover plate; the first top sealing plates are connected with the annular first extension shell, and the first bottom sealing plates are connected with the annular third extension shell; the plurality of second top sealing plates are connected with the annular second extension shell, and the plurality of second bottom sealing plates are connected with the annular bottom shell;

The cleaning liquid baffle comprises a first annular baffle, a second annular baffle, a cleaning liquid side baffle, a third annular baffle and a cleaning liquid bottom baffle; the central tube top cover plate is uniformly provided with a plurality of first annular baffles along the outer circumferential direction of the central tube top cover plate, and the first annular baffles respectively penetrate through the first arc-shaped baffle through grooves and are connected with the plugging baffles; the side ends of the plurality of first cleaning liquid through holes on each U-shaped second extension shell are plugged with a cleaning liquid side baffle; a certain interval is reserved between the top ends of the cleaning liquid side baffles and the second top sealing plate, and a certain interval is reserved between the bottom ends of the cleaning liquid side baffles and the second bottom sealing plate; the upper end of each cleaning liquid side baffle is provided with a second annular baffle respectively; the second annular baffles respectively penetrate through the second arc-shaped baffle grooves and are connected with the blocking baffle; the lower ends of the cleaning liquid side baffles are provided with third annular baffles which penetrate through the cleaning liquid passing grooves, and a plurality of cleaning liquid bottom baffles are respectively and closely blocked on the outer circumferential surface of the third annular baffles corresponding to the plurality of rows of second cleaning liquid through holes;

the water purifying baffles are respectively and uniformly arranged on the outer circumferential surface of the central tube; the water purifying baffles are respectively penetrated into the U-shaped first extending shells and are adhered to the inner end surfaces of the U-shaped first extending shells, and each water purifying baffle is distributed with the water purifying through holes on the inner end surfaces of the U-shaped first extending shells in a staggered manner; a certain interval is reserved between the top ends of the water purifying baffles and the first top sealing plate, and a certain interval is reserved between the bottom ends of the water purifying baffles and the first bottom sealing plate;

The driving component is a driving motor; the driving motor is arranged on the annular first extension shell top cover plate; a motor shaft of the driving motor penetrates through the annular first extension shell top cover plate and is connected with the central tube top cover plate;

when a motor shaft of a driving motor drives a plurality of water purifying baffles to rotate in a U-shaped first extending shell to completely block all water purifying through holes in the U-shaped first extending shell, the cleaning liquid baffles also rotate by the same angle, a plurality of first annular baffles rotate in a plurality of first arc baffle through grooves respectively, the blocking baffles rotate at the upper end of an annular second extending shell, a plurality of second annular baffles rotate in a plurality of second arc baffle grooves respectively, a plurality of cleaning liquid side baffles rotate in a plurality of U-shaped second extending shells respectively and a plurality of cleaning liquid side baffles do not block a plurality of first cleaning liquid through holes respectively, a third annular baffle rotates by the same angle, a plurality of cleaning liquid bottom baffles rotate in an annular bottom shell respectively and a plurality of cleaning liquid bottom baffles do not block a plurality of second cleaning liquid through holes;

the bottom opening of the annular third extension shell forms a purified water outlet; an evaporation water inlet pipe communicated with the liquid inlet space is arranged on the top cover plate of the shell, and the evaporation water inlet pipe is connected with a second pipeline; a waste liquid outlet pipe communicated with the liquid outlet space is arranged on the bottom plate of the shell; the top cover plate and the bottom plate of the shell are jointly provided with a cleaning liquid outlet pipe communicated with the liquid inlet space and the liquid outlet space; the waste liquid outlet pipe and the cleaning liquid outlet pipe are respectively provided with a discharge pump; a cleaning solution inlet pipe communicated with the cleaning solution inlet space is arranged on the cleaning solution top cover plate, and a booster pump is arranged on the cleaning solution inlet pipe; valves are arranged on the evaporation water inlet pipe, the waste liquid outlet pipe, the cleaning liquid inlet pipe and the cleaning liquid outlet pipe.

Compared with the prior art, the invention has the beneficial effects that:

(1) The physical method and equipment are adopted, the flow is shorter, biochemistry is not needed, the influence of water quality change and outside air temperature is avoided, the yielding water is stable and reaches the standard, a novel back cleaning system is arranged in the membrane system, the membrane system still has good performance after long-term use, the water yield is normal, the quality of the yielding water reaches the standard, COD in the final yielding water is less than or equal to 50mg/L, volatile phenol is less than or equal to 0.3mg/L, petroleum is less than or equal to 2.5mg/L, ammonia nitrogen is less than or equal to 8mg/L, and the emission requirement of the emission standard of pollutants in coking chemical industry is met;

(2) The phenol sodium salt crystal product is recovered, and the recycling recovery of phenol is realized;

(3) No biochemical sludge is generated, so that the treatment problem of the biochemical sludge is solved;

(4) The hazardous chemicals such as sulfuric acid, ozone and the like are not needed, so that the dangers of operation and management are reduced, and the burden of enterprises is reduced;

(5) The full process chain treatment of the phenol-ammonia wastewater is realized, and the end treatment problems of concentrated solution, hazardous sludge and the like are avoided.

Drawings

FIG. 1 is a schematic diagram of the overall flow of a phenolic ammonia wastewater short-flow treatment system of the invention;

FIG. 2 is a schematic view of the overall structure of the membrane system of the present invention;

FIG. 3 is a schematic view of the overall perspective structure of the membrane device of the present invention;

Fig. 4 is an enlarged view of a portion a in fig. 3;

FIG. 5 is an overall top view of the membrane device of the present invention;

FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5;

FIG. 7 is a schematic view of the overall exploded structure of the membrane device of the present invention; the method comprises the steps of carrying out a first treatment on the surface of the

Fig. 8 is an enlarged view of a portion B in fig. 7;

fig. 9 is an enlarged view of a portion C in fig. 7;

FIG. 10 is a schematic view of the overall exploded construction of the membrane device of the present invention;

fig. 11 is an enlarged view of a portion D in fig. 10;

FIG. 12 is a schematic view of the center tube and first inner shell of the present invention;

FIG. 13 is a schematic view of the construction of a second inner shell and RO membrane of the present invention;

FIG. 14 is a schematic view of a cleaning liquid baffle structure according to the present invention;

FIG. 15 is a schematic view of the structure of the center tube, the first inner shell, the second inner shell, the RO membrane and the outer shell of the present invention;

fig. 16 is a schematic view of a second inner shell structure according to the present invention.

In the figure: 1. a bag filter; 2. a first pipe; 3. a feed pump; 4. a second pipe; 5. a booster pump; 6. a housing; 7. a central tube; 8. a first inner housing; 81. an annular first main housing; 82. a U-shaped first extension housing; 9. a second inner case; 91. a second main casing; 92. a U-shaped second extension housing; 93. an annular bottom housing; 10. an annular first extension housing; 11. an annular second extension housing; 12. a water purifying baffle; 13. a driving motor; 14. evaporating water out of the inlet pipe; 15. a waste liquid outlet pipe; 16. a cleaning liquid inlet pipe; 17. a cleaning liquid outlet pipe; 18. RO membrane; 19. a first top closure plate; 20. a first bottom closure plate; 21. a water purifying through hole; 22. a second top closure plate; 23. a second bottom closure plate; 24. a first cleaning liquid through hole; 25. the waste water is communicated with the tank; 26. a cleaning liquid passing groove; 27. a second cleaning liquid through hole; 28. the first arc baffle plate is communicated with the groove; 29. a second arcuate baffle slot; 30. plugging baffles; 31. a housing top cover plate; 32. a housing floor; 33. a center tube top cover plate; 34. an annular first extension housing top cover plate; 35. a cleaning solution top cover plate; 36. an annular third extension housing; 37. a first circumferential baffle; 38. a second circumferential baffle; 39. a cleaning liquid side baffle; 40. a third annular baffle; 41. a cleaning liquid bottom baffle; 42. a liquid inlet space; 43. the liquid outlet space.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like refer to an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Examples

s1: the phenol-ammonia wastewater generated in the semi-coke production process enters a natural sedimentation tank for natural sedimentation, the natural sedimentation tank is arranged in series in multiple stages, the temperature is controlled to 35 ℃, the residence time is 10d, and water is discharged from the middle;

s2: in the step S1, the final-stage middle clear liquid outlet water enters a cyclone separating tank for cyclone separation, the cyclone separating tank is arranged in parallel in multiple stages, the temperature is controlled to be 45 ℃, the retention time is 3d, and the middle clear liquid outlet water is discharged;

when the oil removing filter is a fiber cotton filter, the fiber cotton in the fiber cotton filter is a prefilming modified polypropylene material, and the oil absorption is 1.89g/L.

the negative pressure of the negative pressure deamination tower is controlled at minus 0.072MPa and the temperature is 68 ℃.

The pH of the filtered effluent is adjusted to be 12 before entering the tower, or the pH of the middle part of the deamination tower is adjusted to be 12; the deamination effluent was adjusted to pH 12.2.

The multi-effect evaporator is a two-effect evaporator or a three-effect evaporator, and the concentration multiple of the multi-effect evaporator is 13 times. The multi-effect evaporator is optimally a two-effect evaporator, wherein the temperature of the one-effect evaporator is 50.8 ℃, the negative pressure is-0.072 MPa, the evaporation intensity is less than or equal to 20L/-square meter.h, the temperature of the two-effect evaporator is 24.8 ℃ (about 878KPa of local atmospheric pressure), the negative pressure is-0.084 MP, and the evaporation intensity is less than or equal to 12.5L/-square meter.h;

the membrane system is RO membrane, the working temperature is 50 ℃, and the working pressure is 4.5MPa.

S7: the evaporation concentrate in the step S5 is conveyed into a scraper evaporator to be evaporated, more than 95% of evaporation water is discharged, the evaporation water returns to the step S5 multi-effect evaporator to be evaporated, and the evaporation crystal liquid is centrifuged to obtain crude phenol sodium salt crystals;

the working pressure of the scraper evaporator is-0.083 MPa, the temperature is 25.2 ℃ (about 878KPa of local atmospheric pressure), and the concentration multiple of the scraper evaporator is 20 times.

As shown in figure 1, the phenol-ammonia wastewater short-process treatment system comprises three multi-stage natural settling tanks, three cyclone separation tanks, two oil removal filters, a preheater, a negative pressure deamination tower, a condenser, a recycling concentration device, a regulating preheater, a deamination water outlet tank, a condensation tank, a one-effect heater, a one-effect separator, a two-effect heater, a two-effect separator, a two-effect condenser, a condensation water tank, two vacuum units, a condensation liquid tank, a scraper thickener, a scraper condenser, a scraper condensation tank, a kettle residue liquid tank, an evaporation water outlet tank, a membrane system and a concentrate tank.

10 m/h phenolic ammonia wastewater generated in the semi-coke production process flows into a first multi-stage natural settling tank through a pipeline, wherein the middle clear liquid of the first multi-stage natural settling tank is connected with a second multi-stage natural settling tank through a pipeline, and the middle clear liquid of the second multi-stage natural settling tank is connected with a third multi-stage natural settling tank through a pipeline; the upper layer floating oil of the three multi-stage natural settling tanks is collected, and the lower layer sediment of the three multi-stage natural settling tanks is collected.

The middle clear liquid of the third multistage natural settling tank is 10 m/h in length and is respectively connected with the three cyclone separation tanks through pipelines; the middle clear liquid 10 m/h of the three cyclone separating tanks is respectively connected with two oil removing filters through pipelines; the upper layer floating oil of the three cyclone separating tanks is collected, and the lower layer sediment of the three cyclone separating tanks is collected.

The oil removal filtered water obtained by filtering the two oil removal filters is respectively connected with the preheater through a pipeline; the waste water in the preheater is 10 m/h and passes through the pipeline and the upper part of the negative pressure deamination tower.

The ammonia-containing steam of the negative pressure deamination tower is connected with a condenser through a pipeline, the negative pressure deamination tower is filled with steam through a pipeline, deamination effluent of 10 m/h at the bottom of the negative pressure deamination tower is connected with a deamination effluent tank through a pipeline; ammonia gas of the ammonia-containing steam of the negative pressure deamination tower is connected with the recovery concentration device through a pipeline after passing through the condenser, condensed liquid of the ammonia gas enters the condensing tank, and the condensed liquid in the condensing tank is connected with the negative pressure deamination tower through the pipeline; the recovery concentration device discharges ammonia water.

The 10 m/h waste water in the deamination water outlet tank is connected with the regulating preheater through a pipeline; the deamination effluent of the regulating preheater is connected with an effective heater through a pipeline; one side inlet of the primary heater is communicated with steam through a pipeline, one side outlet of the primary heater is used for discharging steam condensate through a pipeline, and the other side outlet of the primary heater is used for conveying primary secondary steam into the primary separator through a pipeline; the top outlet of the first-effect separator is used for conveying the first-effect secondary steam into the second-effect heater through a pipeline; the outlet at the upper end of the other side of the two-effect heater conveys the two-effect secondary steam into the two-effect separator, and the outlet at the lower end of the other side conveys the one-effect condensate water into the two-effect separator; the top end outlet of the secondary effect separator conveys the secondary effect steam to the secondary effect condenser; the outlet at the bottom end of the first-effect separator is used for respectively conveying the first-effect concentrated solution into the first-effect heater and the second-effect heater through pipelines; the bottom outlet of the secondary separator is used for conveying the secondary concentrated solution to the secondary heater through a pipeline; the two-effect separator conveys the 1m thick evaporation liquid to the concentrated liquid tank through a pipeline.

The double-effect condenser conveys noncondensable gas to a vacuum unit through a pipeline; the double-effect condenser conveys 10 m/h double-effect condensed water to a condensed water tank through a pipeline; the condensate water tank conveys the evaporated water to the evaporation water tank through a pipeline; the evaporation water tank conveys 10m of evaporation water per hour to the membrane system through a pipeline; the membrane system discharges 9.5m of final produced water per hour through a pipeline; the membrane system conveys the concentrated water into the concentrated water tank through a pipeline; the concentrated water tank is used for conveying 0.5 m/h of concentrated water into the deamination water outlet tank through a pipeline.

The concentrated solution tank conveys the evaporated concentrated solution with the concentration of 1 m/h to the scraper concentrator through a pipeline; conveying light component steam in the operation process of the scraper concentrator into the scraper condenser through a pipeline, and conveying 0.1m evaporation crystallization liquid in the operation process of the scraper concentrator into a kettle residual liquid tank through a pipeline; the scraper condenser conveys non-condensable gas into the vacuum unit through a pipeline, and the scraper condenser conveys scraper condensate into the scraper condensing tank through a pipeline; the scraper condensing tank conveys 0.9 m/h of scraper condensate to the deamination water outlet tank through a pipeline.

Pumps can be arranged on each pipe of the phenol-ammonia wastewater short-process treatment system to convey materials.

As shown in fig. 2-16, the membrane system comprises a bag filter 1 and a membrane device; the evaporated water of the evaporated water tank is connected with the bag filter 1 through a first pipeline 2, and a feed pump 3 is arranged on the first pipeline 2; the bag filter 1 is connected with the membrane device through a second pipeline 4, and a booster pump 5 is arranged on the second pipeline 4.

The membrane device comprises an outer shell 6, a central tube 7, a first inner shell 8, a second inner shell 9, an annular first extension shell 10, an annular second extension shell 11, a water purification baffle 12, a cleaning liquid baffle, a driving assembly, an evaporation water inlet tube 14, a waste liquid outlet tube 15, a cleaning liquid inlet tube 16, a cleaning liquid outlet tube 17 and an RO membrane 18. The central tube 7, the first inner shell 8, the second inner shell 9 and the outer shell 6 are sequentially arranged from inside to outside, and a water purifying space, a cleaning liquid space and an RO membrane 18 installing space are respectively formed between the central tube 7 and the first inner shell 8, between the first inner shell 8 and the second inner shell 9 and between the first inner shell 8 and the outer shell 6.

A plurality of RO membranes 18 are uniformly arranged in the RO membrane 18 space along the inner circumferential surface of the shell 6, and a second installation space is reserved between every two adjacent RO membranes 18.

The central tube 7 is externally provided with a first inner shell 8; the first inner shell 8 is formed by an annular first main shell 81 and a plurality of U-shaped first extension shells 82 which are uniformly and outwardly protruded on the circumferential surface of the annular first main shell 81; the top end and the bottom end of each U-shaped first extension shell 82 are provided with a first top sealing plate 19 and a first bottom sealing plate 20; a first installation space is formed between the outer parts of every two adjacent U-shaped first extension shells 82, the inner part of each U-shaped first extension shell 82 is communicated with the water purification space, and each first installation space is communicated with the second installation space to form a cleaning liquid passing space; the outer circumferential surfaces of the plurality of U-shaped first extension cases 82 are respectively attached to the RO membranes 18; the end surfaces of the U-shaped first extension shells 82, which are attached to the RO membranes 18, are respectively provided with a plurality of water purifying through holes 21.

The second inner shell 9 is composed of a plurality of second main shells 91, a U-shaped second extension shell 92 protruding outwards on each second main shell 91, and a plurality of annular bottom shells 93 arranged at the lower ends of the second main shells 91; the top end and the bottom end of each U-shaped second extension shell 92 are provided with a second top sealing plate 22 and a second bottom sealing plate 23; in each cleaning solution passing space, the second main shell 91 is matched and attached with the first installation space, the U-shaped second extension shell 92 is matched and attached with the second installation space, and the annular bottom shell 93 is attached with the bottom ends of the RO membranes 18; a plurality of first cleaning liquid through holes 24 are respectively formed in the end face of one side, which is attached to the RO membrane 18, of the plurality of U-shaped second extension shells 92; the annular bottom shell 93 is an annular shell with a plurality of wastewater through grooves 25 along the circumferential direction thereof, and the positions of the wastewater through grooves 25 respectively correspond to the RO membranes 18; the annular bottom shell 93 is hollow, the cleaning solution passing groove 26 communicated with the inside of the annular bottom shell 93 is formed in the inner side of the upper plate of the annular bottom shell 93 corresponding to the first installation space, a plurality of rows of second cleaning solution through holes 27 are formed in the outer side of the upper plate of the annular bottom shell 93 corresponding to the RO membranes 18, and the rows of second cleaning solution through holes 27 and the wastewater passing grooves 25 are distributed in a staggered mode.

The upper end of the first main shell is provided with an annular first extension shell 10, and the annular first extension shell 10 is uniformly provided with a plurality of first arc baffle through grooves 28 along the side circumferential surface direction; the upper end of the second main casing 91 is provided with an annular second extension casing 11, a plurality of second arc-shaped baffle grooves 29 are uniformly formed in the annular second extension casing 11 along the side circumferential direction of the annular second extension casing 11, a blocking baffle 30 is placed at the position, corresponding to the second arc-shaped baffle grooves 29, of the upper end of the annular second extension casing 11, and the blocking baffle 30 completely covers the plurality of second arc-shaped baffle grooves 29.

The top end of the shell 6 is provided with a shell top cover plate 31, the bottom end of the shell 6 is provided with a shell bottom plate 32, and the shell top cover plate 31 is provided with a central hole; a liquid inlet space 42 is reserved between the RO membranes 18 and the top cover plate 31 of the shell, and a liquid outlet space 43 is reserved between the bottom plate 32 of the shell and the annular bottom shell 93.

The central tube 7, the annular first extension shell 10 and the annular second extension shell 11 extend out of the central hole, and the outer wall of the annular second extension shell 11 is attached to the inner wall of the central hole; the top ends of the central pipe 7 and the annular first extension shell 10 are respectively provided with a central pipe top cover plate 33 and an annular first extension shell top cover plate 34; the space between the annular first extension shell 10 and the annular second extension shell 11 is a cleaning liquid entering space, and a cleaning liquid top cover plate 35 is arranged at the top end of the cleaning liquid entering space; the lower end of the first main shell is provided with an annular third extension shell 36, the inner wall and the outer wall of the annular bottom shell 93 are respectively connected with the outer wall of the annular third extension shell 36 and the inner wall of the shell 6, and the inner wall of the shell bottom plate 32 is connected with the outer wall of the annular third extension shell 36; the height of the annular first extension shell top cover plate 34 is higher than the height of the central tube top cover plate 33 and the height of the cleaning liquid top cover plate 35; the cleaning liquid top cover plate 35 is higher than the housing top cover plate 31; a plurality of first top sealing plates 19 are connected with the annular first extension shell 10, and a plurality of first bottom sealing plates 20 are connected with the annular third extension shell 36; a plurality of second top sealing plates 22 are connected with the annular second extension shell 11, and a plurality of second bottom sealing plates 23 are connected with the annular bottom shell 93;

The cleaning liquid baffle includes a first annular baffle 37, a second annular baffle 38, a cleaning liquid side baffle 39, a third annular baffle 40, and a cleaning liquid bottom baffle 41. The central tube top cover plate 33 is uniformly provided with a plurality of first annular baffles 37 along the outer circumferential direction thereof, and the plurality of first annular baffles 37 respectively penetrate through the plurality of first arc-shaped baffle through grooves 28 and are connected with the plugging baffle 30; the side ends of the plurality of first cleaning liquid through holes 24 on each U-shaped second extension shell 92 are plugged with a cleaning liquid side baffle 39; a certain interval is reserved between the top ends of the cleaning liquid side baffles 39 and the second top sealing plate 22, and a certain interval is reserved between the bottom ends of the cleaning liquid side baffles and the second bottom sealing plate 23; the upper end of each cleaning liquid side baffle 39 is respectively provided with a second annular baffle 38; the second annular baffles 38 respectively penetrate through the second arc-shaped baffle grooves 29 and are connected with the blocking baffle 30; the lower ends of the cleaning liquid side baffles 39 are provided with third annular baffles 40, the third annular baffles 40 penetrate through the cleaning liquid passing grooves 26, and a plurality of cleaning liquid bottom baffles 41 are respectively plugged and plugged at positions corresponding to the plurality of rows of second cleaning liquid through holes 27 on the outer circumferential surface of the third annular baffles 40.

A plurality of water purifying baffles 12 are respectively and uniformly arranged on the outer circumferential surface of the central tube 7; the water purifying baffles 12 are respectively penetrated into the U-shaped first extension shells 82, the water purifying baffles 12 are attached to the inner end surfaces of the U-shaped first extension shells 82, and each water purifying baffle 12 is distributed in a staggered manner with the water purifying through holes 21 on the inner end surfaces of the U-shaped first extension shells 82; a certain interval is reserved between the top ends of the water purifying baffles 12 and the first top sealing plate 19, and a certain interval is reserved between the bottom ends of the water purifying baffles and the first bottom sealing plate 20.

The driving component is a driving motor 13; the driving motor 13 is arranged on the annular first extension shell top cover plate 34; the motor shaft of the driving motor 13 passes through the annular first extension housing top cover plate 34 and is connected with the central tube top cover plate 33. The upper end of the annular first extension shell 10 is fixedly provided with an annular baffle plate, the outer wall of the central tube 7 is attached to the inner wall of the annular baffle plate, the central tube 7 can rotate along the annular baffle plate, and the annular baffle plate plays a role in preventing purified water from entering the driving motor 13.

The bottom opening of the annular third extension casing 36 forms a purified water outlet; the top cover plate 31 of the shell is provided with an evaporation water inlet pipe 14 communicated with the liquid inlet space 42, and the evaporation water inlet pipe 14 is connected with the second pipeline 4; the bottom plate 32 of the shell is provided with a waste liquid outlet pipe 15 communicated with the liquid outlet space 43; the top cover plate 31 and the bottom plate 32 of the shell are jointly provided with a cleaning liquid outlet pipe 17 communicated with a liquid inlet space 42 and a liquid outlet space 43; the waste liquid outlet pipe 15 and the cleaning liquid outlet pipe 17 are respectively provided with a discharge pump; a cleaning solution inlet pipe 16 communicated with the cleaning solution inlet space is arranged on the cleaning solution top cover plate 35, and a booster pump 5 is arranged on the cleaning solution inlet pipe 16; valves (valves and partial pumps are not shown in the figure) are arranged on the evaporation water inlet pipe 14, the waste liquid outlet pipe 15, the cleaning liquid inlet pipe 16 and the cleaning liquid outlet pipe 17, the valves and the pumps in the scheme adopt conventional valves and pumps, and the mounting mode of the valves and the pumps on the pipes is the same as that of the market disclosure, and the description is omitted.

The working principle of the membrane system is as follows:

when the reverse osmosis process is carried out, the evaporated water of the evaporated water tank is output to the bag filter 1 through the first pipeline 2, impurities are filtered by the bag filter 1, and the feeding pump 3 is driven; the filtered evaporated water is output to an evaporated water inlet pipe 14 through a second pipeline 4, and a booster pump 5 plays roles in driving and boosting and has the working pressure of 4.5MPa;

in this state, the membrane device is in a reverse osmosis working state, the valves on the cleaning solution inlet pipe 16 and the cleaning solution outlet pipe 17 are closed, the valves on the evaporation water inlet pipe 14 and the waste liquid outlet pipe 15 are opened, each water purifying baffle 12 is distributed in a dislocation manner with a plurality of water purifying through holes 21 on the inner end face of the U-shaped first extension shell 82, a cleaning solution side baffle 39 is plugged at the side end of a plurality of first cleaning solution through holes 24 on each U-shaped second extension shell 92, a plurality of cleaning solution bottom baffles 41 are respectively plugged at a plurality of rows of second cleaning solution through holes 27, therefore, when evaporation water passes through a plurality of RO membranes 18, under a certain pressure, water molecules enter a water purifying space between the central pipe 7 and the first inner shell 8 through the RO membranes 18, and are discharged from the bottom end of the annular third extension shell 36, and the discharged water purifying water is the final produced water; impurities such as organic matters remained in the evaporated effluent can not pass through the RO membrane 18 and can be desalted, so that the sewage is directly discharged through the waste liquid outlet pipe 15, and part of the sewage, namely concentrated water, is further returned to the deamination water outlet tank for recycling treatment, and the permeable purified water and the impermeable concentrated water are strictly distinguished;

When the short-flow treatment process of the whole phenol-ammonia wastewater is finished, the membrane device can enter a back-washing working state, valves on the washing liquid inlet pipe 16 and the washing liquid outlet pipe 17 are opened, valves on the evaporation water inlet pipe 14 and the waste liquid outlet pipe 15 are closed, the driving motor 13 works for a period of time, a motor shaft of the driving motor 13 drives a plurality of water purifying baffles 12 to rotate inside the U-shaped first extension shell 82 until all water purifying through holes 21 in the U-shaped first extension shell 82 are completely blocked respectively, and the driving motor 13 stops working; the cleaning liquid baffles also rotate by the same angle, the first annular baffles 37 respectively rotate in the first arc baffle through grooves 28, the plugging baffles 30 rotate at the upper end of the annular second extension housing 11, the second annular baffles 38 respectively rotate in the second arc baffle grooves 29, the cleaning liquid side baffles 39 respectively rotate in the U-shaped second extension housing 92 and the cleaning liquid side baffles 39 respectively do not plug the first cleaning liquid through holes 24, the third annular baffles 40 rotate by the same angle, the cleaning liquid bottom baffles 41 respectively rotate in the annular bottom housing 93 and the cleaning liquid bottom baffles 41 do not plug the second cleaning liquid through holes 27; the cleaning solution adopts the conventional RO membrane 18 cleaning solution, the cleaning solution enters the cleaning solution entering space and the cleaning solution space and is discharged through a plurality of first cleaning solution through holes 24 and a plurality of second cleaning solution through holes 27, so that the cleaning solution backwashing can be carried out on the side and the upper part of each RO membrane 18; the cleaning solution after cleaning the RO membrane 18 is discharged through a cleaning solution outlet pipe 17 until the whole RO membrane 18 is completely cleaned, and then valves on the cleaning solution inlet pipe 16 and the cleaning solution outlet pipe 17 are closed;

Generally, the RO filter element in the market is formed by winding a plurality of layers of materials, the RO reverse osmosis membrane has high filtering precision, and gray stains can be seen when the RO filter element is opened, and the RO filter element is sticky. One of the existing markets is to disassemble the membrane and manually scrub dirt on the surface of the membrane, and the RO membrane 18 cleaning method is complex, time-consuming and labor-consuming, and complex in membrane reinstallation. The RO membrane 18 is immersed by introducing cleaning liquid into the RO membrane 18, and discharging the cleaning liquid after a period of time, and the immersed cleaning mode is that the RO filter element is formed by winding a plurality of layers of materials, so that the cleaning liquid still cannot thoroughly enter the RO filter element in the middle, and dirt on the RO filter element at the inner side cannot be well removed, and the cleaning effect of the RO membrane 18 filter element is effective;

in the RO membrane 18 cleaning solution in the scheme, the RO on the outer side and the inner side can be conveniently cleaned from top to bottom at the side of each RO membrane 18 through the plurality of first cleaning solution through holes 24, in particular, the RO is conveniently and thoroughly cleaned by the cleaning solution without being disassembled in the RO membrane 18 on the inner side, and meanwhile, the RO on the outer side and the inner side can be conveniently cleaned by the plurality of rows of second cleaning solution through holes 27 under each RO membrane 18, the RO is conveniently and thoroughly cleaned by the cleaning solution without being disassembled in the RO membrane 18 on the inner side;

The RO membrane 18 is cleaned thoroughly at regular intervals (generally several months depending on the cleaning degree of the RO membrane 18 of the membrane system) and simply, so that the performance degradation of the membrane system after long-term use can be avoided, the normal water yield is ensured, and the water quality of the produced water reaches the standard.

After the phenol-ammonia wastewater short-process treatment method and the phenol-ammonia wastewater short-process treatment system are adopted, the content of each pollutant in the phenol-ammonia wastewater is greatly reduced, and the specific content is shown in the table 1;

table 1 content of contaminants in phenolic ammonia wastewater:

；

the present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.

Claims

1. The method for treating the phenol-ammonia wastewater in a short process is characterized by comprising the following steps of:

2. The method for short-process treatment of phenol-ammonia wastewater according to claim 1, wherein the oil removal filter in the step S3 is a walnut skin filter or a fiber cotton filter; the fiber cotton in the fiber cotton filter is a prefilming modified polypropylene material, and the oil absorption is 1.89g/L.

3. The method for short-process treatment of phenol-ammonia wastewater according to claim 1, wherein in the step S4, the negative pressure of the negative pressure deamination tower is controlled to be-0.07 MPa to-0.08 MPa.

4. The method for short-process treatment of phenol-ammonia wastewater according to claim 1, wherein in the step S4, the pH of the filtered effluent is adjusted to 12 before entering the tower, or to 12 in the middle of the deamination tower; in the step S5, the deamination effluent is adjusted to pH 12 to 12.5.

5. The method for short-process treatment of phenol-ammonia wastewater according to claim 1, wherein in the step S5, the multiple-effect evaporator is a two-effect evaporator or a three-effect evaporator, and the concentration multiple of the multiple-effect evaporator is 10-20 times.

6. The method for short-process treatment of phenol-ammonia wastewater according to claim 5, wherein the multi-effect evaporator is a two-effect evaporator, wherein the temperature of the one-effect evaporator is less than or equal to 60 ℃, the negative pressure is less than or equal to-0.08 MPa, the evaporation intensity is less than or equal to 20L/. Multidot.h, the temperature of the two-effect evaporator is less than or equal to 41.5 ℃, the negative pressure is less than or equal to-0.092 MPa, and the evaporation intensity is less than or equal to 12.5L/. Multidot.h.

7. The method for short-process treatment of phenol-ammonia wastewater according to claim 1, wherein in the step S6, the membrane system is an RO membrane (18), the working temperature is less than or equal to 50 ℃, and the working pressure is 4.5MPa.

8. The method for short-process treatment of phenol-ammonia wastewater according to claim 1, wherein in the step S7, the concentration factor of the scraper evaporator is 15-30 times.

9. The phenolic ammonia wastewater short-process treatment system of any one of claims 1-8, comprising three multi-stage natural settling tanks, three cyclone separation tanks, two deoiling filters, a preheater, a negative pressure deamination tower, a condenser, a recovery concentration device, a regulating preheater, a deamination water outlet tank, a condensation tank, a first effect heater, a first effect separator, a second effect heater, a second effect separator, a second effect condenser, a condensation water tank, two vacuum units, a concentrate tank, a scraper concentrator, a scraper condenser, a scraper condensation tank, a tank residue tank, an evaporation water outlet tank, a membrane system, and a concentrate tank;

the concentrated solution tank conveys the evaporated concentrated solution to the scraper concentrator through a pipeline; light component steam in the operation process of the scraper concentrator is conveyed into the scraper condenser through a pipeline, and heavy component evaporation crystallization liquid in the operation process of the scraper concentrator is conveyed into a kettle residual liquid tank through a pipeline; the scraper condenser conveys non-condensable gas into the vacuum unit through a pipeline, and the scraper condenser conveys scraper condensate into the scraper condensing tank through a pipeline; the scraper condensing tank conveys scraper condensate to the deamination water outlet tank through a pipeline.

10. A phenolic ammonia waste water short-flow treatment system according to claim 9, characterized in that the membrane system comprises a bag filter (1) and a membrane device; the evaporation outlet water of the evaporation water tank is connected with the bag filter (1) through a first pipeline (2), and a feed pump (3) is arranged on the first pipeline (2); the bag filter (1) is connected with the membrane device through a second pipeline (4), and a booster pump (5) is arranged on the second pipeline (4);

The membrane device comprises an outer shell (6), a central tube (7), a first inner shell (8), a second inner shell (9), an annular first extension shell (10), an annular second extension shell (11), a water purification baffle (12), a cleaning fluid baffle, a driving assembly, an evaporation water outlet inlet tube (14), a waste liquid outlet tube (15), a cleaning fluid inlet tube (16), a cleaning fluid outlet tube (17) and an RO membrane (18); the central tube (7), the first inner shell (8), the second inner shell (9) and the outer shell (6) are sequentially arranged from inside to outside, and a water purifying space, a cleaning liquid space and an RO membrane (18) installation space are respectively formed between the central tube (7) and the first inner shell (8), between the first inner shell (8) and the second inner shell (9) and between the first inner shell (8) and the outer shell (6);

a plurality of RO membranes (18) are uniformly arranged in the RO membrane (18) space along the inner circumferential surface of the shell (6), and a second installation space is reserved between every two adjacent RO membranes (18);

the central tube (7) is externally provided with a first inner shell (8); the first inner shell (8) is composed of an annular first main shell (81) and a plurality of U-shaped first extension shells (82) which are uniformly and outwards arranged on the circumferential surface of the annular first main shell (81) in a protruding mode; the top end and the bottom end of each U-shaped first extension shell (82) are provided with a first top sealing plate (19) and a first bottom sealing plate (20); a first installation space is formed between the outer parts of every two adjacent U-shaped first extension shells (82), the inner part of each U-shaped first extension shell (82) is communicated with the water purification space, and each first installation space is communicated with the second installation space to form a cleaning liquid passing space; the outer circumferential surfaces of the U-shaped first extension shells (82) are respectively attached to the RO membranes (18); the end surfaces of the U-shaped first extension shells (82) attached to the RO membranes (18) are respectively provided with a plurality of water purifying through holes (21);

The second inner shell (9) is composed of a plurality of second main shells (91), a U-shaped second extension shell (92) which is arranged on each second main shell (91) in an outward protruding mode, and an annular bottom shell (93) which is arranged at the lower end of each second main shell (91); the top end and the bottom end of each U-shaped second extension shell (92) are provided with a second top sealing plate (22) and a second bottom sealing plate (23); in each cleaning solution passing space, the second main shell (91) is matched and attached with the first installation space, the U-shaped second extension shell (92) is matched and attached with the second installation space, and the annular bottom shell (93) is attached with the bottom ends of a plurality of RO membranes (18); a plurality of first cleaning liquid through holes (24) are respectively formed in the end face of one side, which is attached to the RO membrane (18), of the plurality of U-shaped second extension shells (92); the annular bottom shell (93) is an annular shell with a plurality of wastewater through grooves (25) along the circumferential direction, and the positions of the wastewater through grooves (25) respectively correspond to the positions of the RO membranes (18); the inside of the annular bottom shell (93) is hollow, a cleaning liquid passing groove (26) communicated with the inside of the annular bottom shell (93) is formed in the inner side of the upper plate of the annular bottom shell (93) corresponding to the first installation space position, a plurality of rows of second cleaning liquid through holes (27) are respectively formed in the outer side of the upper plate of the annular bottom shell (93) corresponding to the RO membranes (18), and the rows of second cleaning liquid through holes (27) and the wastewater through grooves (25) are distributed in a staggered mode;

The upper end of the first main shell is provided with an annular first extension shell (10), and a plurality of first arc baffle through grooves (28) are uniformly formed in the annular first extension shell (10) along the side circumferential surface direction of the annular first extension shell; the upper end of the second main shell (91) is provided with an annular second extension shell (11), the annular second extension shell (11) is uniformly provided with a plurality of second arc-shaped baffle grooves (29) along the side circumferential surface direction of the annular second extension shell, a blocking baffle (30) is arranged at the position, corresponding to the second arc-shaped baffle grooves (29), of the upper end of the annular second extension shell (11), and the blocking baffle (30) completely covers the plurality of second arc-shaped baffle grooves (29);

the top end of the shell (6) is provided with a shell (6) top cover plate, the bottom end of the shell (6) is provided with a shell (6) bottom plate, and the shell (6) top cover plate is provided with a central hole; a liquid inlet space (42) is reserved between the RO membranes (18) and the top cover plate of the shell (6), and a liquid outlet space (43) is reserved between the bottom plate of the shell (6) and the annular bottom shell (93);

the central tube (7), the annular first extension shell (10) and the annular second extension shell (11) extend out of the central hole, and the outer wall of the annular second extension shell (11) is attached to the inner wall of the central hole; the top ends of the central tube (7) and the annular first extension shell (10) are respectively provided with a top cover plate of the central tube (7) and a top cover plate of the annular first extension shell (10); the space between the annular first extension shell (10) and the annular second extension shell (11) is a cleaning liquid entering space, and a cleaning liquid top cover plate (35) is arranged at the top end of the cleaning liquid entering space; the lower end of the first main shell is provided with an annular third extension shell (36), the inner wall and the outer wall of the annular bottom shell (93) are respectively connected with the outer wall of the annular third extension shell (36) and the inner wall of the shell (6), and the inner wall of the bottom plate of the shell (6) is connected with the outer wall of the annular third extension shell (36); the heights of the top cover plates of the annular first extension shell (10) are higher than the heights of the top cover plates of the central tube (7) and the cleaning liquid top cover plates (35); the height of the cleaning liquid top cover plate (35) is higher than that of the top cover plate of the shell (6); a plurality of first top sealing plates (19) are connected with the annular first extension shell (10), and a plurality of first bottom sealing plates (20) are connected with the annular third extension shell (36); a plurality of second top sealing plates (22) are connected with the annular second extension shell (11), and a plurality of second bottom sealing plates (23) are connected with the annular bottom shell (93);

The cleaning liquid baffle comprises a first annular baffle (37), a second annular baffle (38), a cleaning liquid side baffle (39), a third annular baffle (40) and a cleaning liquid bottom baffle (41); a plurality of first annular baffles (37) are uniformly arranged on the top cover plate of the central tube (7) along the direction of the outer circumferential surface of the top cover plate, and the plurality of first annular baffles (37) are respectively connected with the plugging baffle (30) by penetrating through the plurality of first arc-shaped baffle through grooves (28); the side ends of a plurality of first cleaning liquid through holes (24) on each U-shaped second extension shell (92) are plugged with a cleaning liquid side baffle (39); a certain interval is reserved between the top ends of the cleaning liquid side baffles (39) and the second top sealing plate (22), and a certain interval is reserved between the bottom ends of the cleaning liquid side baffles and the second bottom sealing plate (23); the upper end of each cleaning liquid side baffle (39) is respectively provided with a second annular baffle (38); the second annular baffles (38) respectively penetrate through the second arc baffle grooves (29) to be connected with the blocking baffle (30); the lower ends of the cleaning liquid side baffles (39) are provided with third annular baffles (40), the third annular baffles (40) penetrate through the cleaning liquid passing grooves (26), and a plurality of cleaning liquid bottom baffles (41) are respectively and closely blocked at positions corresponding to the plurality of rows of second cleaning liquid through holes (27) on the outer circumferential surface of the third annular baffles (40);

A plurality of water purifying baffles (12) are respectively and uniformly arranged on the outer circumferential surface of the central tube (7); the water purification baffles (12) are respectively penetrated into the U-shaped first extension shells (82), the water purification baffles (12) are attached to the inner end surfaces of the U-shaped first extension shells (82), and each water purification baffle (12) is distributed in a staggered manner with the water purification through holes (21) on the inner end surfaces of the U-shaped first extension shells (82); a certain interval is reserved between the top ends of the water purifying baffles (12) and the first top sealing plate (19), and a certain interval is reserved between the bottom ends of the water purifying baffles and the first bottom sealing plate (20);

the driving component is a driving motor (13); the driving motor (13) is arranged on the top cover plate of the annular first extension shell (10); a motor shaft of the driving motor (13) penetrates through the top cover plate of the annular first extension shell (10) and is connected with the top cover plate of the central tube (7);

when a motor shaft of a driving motor (13) drives a plurality of water purifying baffles (12) to rotate in a U-shaped first extending shell (82) to completely block all water purifying through holes (21) in the U-shaped first extending shell (82) respectively, the cleaning liquid baffles also rotate by the same angle, a plurality of first annular baffles (37) rotate in a plurality of first arc baffle through grooves (28) respectively, a blocking baffle (30) rotates at the upper end of an annular second extending shell (11), a plurality of second annular baffles (38) rotate in a plurality of second arc baffle grooves (29) respectively, a plurality of cleaning liquid side baffles (39) rotate in a plurality of U-shaped second extending shells (92) respectively and a plurality of cleaning liquid side baffles (39) do not block a plurality of first cleaning liquid through holes (24) respectively, a plurality of cleaning liquid bottom baffles (41) rotate in an annular bottom shell (93) respectively and a plurality of bottom cleaning liquid baffles (41) do not block a plurality of second cleaning liquid through holes (27) any more;

The bottom opening of the annular third extension shell (36) forms a purified water outlet; an evaporation water inlet pipe (14) communicated with the liquid inlet space (42) is arranged on the top cover plate of the shell (6), and the evaporation water inlet pipe (14) is connected with the second pipeline (4); a waste liquid outlet pipe (15) communicated with the liquid outlet space (43) is arranged on the bottom plate of the shell (6); a cleaning solution outlet pipe (17) communicated with the liquid inlet space (42) and the liquid outlet space (43) is arranged on the top cover plate of the shell (6) and the bottom plate of the shell (6); the waste liquid outlet pipe (15) and the cleaning liquid outlet pipe (17) are respectively provided with a discharge pump; a cleaning solution inlet pipe (16) communicated with the cleaning solution inlet space is arranged on the cleaning solution top cover plate (35), and a booster pump (5) is arranged on the cleaning solution inlet pipe (16); valves are arranged on the evaporation water inlet pipe (14), the waste liquid outlet pipe (15), the cleaning liquid inlet pipe (16) and the cleaning liquid outlet pipe (17).