WO2008128471A1

WO2008128471A1 - Biphase separating membrane, its preparing method and method for treating high concentration ammonia nitrogen waste water using the biphase separating membrane

Info

Publication number: WO2008128471A1
Application number: PCT/CN2008/070747
Authority: WO
Inventors: Jun Ma; Shengli Sun; Xin Luo; Xiangchun Qi; Yumei Shi; He Huang; Zhongrong Zhao
Original assignee: Beijing Baicun Environmental Protection Technology Develops Ltd.
Priority date: 2007-04-23
Filing date: 2008-04-17
Publication date: 2008-10-30
Also published as: CN101037244A

Abstract

A biphase separating membrane, its preparing method and a method for treating high concentration ammonia nitrogen waste water using the biphase separating membrane are provided. The biphase separating membrane is prepared from 98-102 parts macromolecule polymeric materials, 0.001-5 parts titania fibre with 5-100 nm fibre length and 0.01-3.5 parts chemical fibre fabric according to the quality parts rate. The biphase separating membrane is prepared according to the following steps: mixing the macromolecule polymeric materials with the nano-titania fibre and the chemical fibre fabric; agitating the mixture under 160-240? and 500-3000 r/min for 0.5-8 h; drying and shaping to get the biphase separating membrane. The high concentration ammonia nitrogen waste water treatment method comprises: (1) the catalyst is added into the waste water which is then subjected to microwave irradiation; and (2) the waste water, after microwave irradiation, is flocculating settled and filtrated, and then the pH value of the waste water is adjusted to execute the biphase separation membranes treatment so as to obtain clear water.

Description

Biphase separation membrane, preparation method thereof and utilization of the same

High concentration ammonia nitrogen wastewater treatment method

[1] Technical field

[2] The present invention relates to a method for treating wastewater and a two-phase separation membrane and a preparation method thereof.

[3] Background Art

[4] The eutrophication of surface water bodies has caused the deterioration of water environment and the decline of drinking water quality. The red tide in the offshore waters has reached a very serious level. The key factor causing eutrophication of water bodies is the influx of large amounts of nutrients into the water bodies, and the discharge of high-concentration ammonia-nitrogen wastewater. It is the primary factor for eutrophication.

[5] Ammonia nitrogen is the main component of various industrial wastewaters, including coal chemical industry wastewater, chemical fertilizer industrial wastewater, tannery industrial wastewater, pesticide manufacturing wastewater, explosive manufacturing wastewater, and chemical wastewater. The concentration of ammonia nitrogen in these industrial wastewaters ranges from a few hundred mg/L to tens of thousands of mg/L, and the water often has high salt content and high concentration of organic matter, which is very difficult to handle. At present, the ammonia removal method used has biological processes (nitrification-denitrification, simultaneous nitrification-denitrification, short-cut nitrification-denitrification, anaerobic ammonium oxidation, aerobic denitrification, constructed wetland, algae culture, nitrogen-sulfur synergistic removal method, etc. ), chemical processes (ion exchange, stripping, chemical precipitation, electrodialysis, electrochemical treatment, wet catalytic oxidation, fluorination, etc.), physical processes (reverse osmosis, soil irrigation, etc.). Bio-process and physical processes are only suitable for the treatment of low-concentration (<500mg/L) ammonia-containing wastewater. At present, the treatment of high-concentration ammonia-nitrogen wastewater has the disadvantages of high water treatment cost, secondary pollution, or high energy consumption. . Although the existing membrane absorption technology can solve the problem of high energy consumption, there is a low ammonia nitrogen removal rate (only about 60%), low material strength, poor pressure resistance, easy clogging, and easy pollution, and it is difficult to be in large-scale water. Used in processing.

[6] Summary of the invention

[7] The object of the present invention is to solve the problems of low separation strength, poor pressure resistance, easy pollution, high treatment cost of high-concentration ammonia nitrogen wastewater, high energy consumption and secondary pollution. Treatment method of concentration ammonia nitrogen wastewater, dual phase separation membrane and preparation method thereof.

[8] The phase separation ratio of the two-phase separation membrane is 98~102 parts of polymer material, and the length of the fiber is 0.001~5 parts.

~100nm titanium dioxide fiber and 0.01~3.5 parts of chemical fiber fabric; wherein the polymer material is polypropylene or polyvinylidene fluoride; the chemical fiber fabric is polypropylene or acrylic. The biphasic separation membrane is prepared as follows: 98 to 102 parts of the polymer material, 0.001 to 5 parts of the titanium dioxide fiber having a fiber length of 5 to 100 nm, and 0.01 to 3.5 parts of the chemical fiber fabric are mixed according to the mass ratio, and then Stirring at 160~240 °C with stirring speed of 500~3000r/min for 0.5~8h, dry forming to obtain a two-phase separation membrane; wherein the polymer material is polypropylene or polyvinylidene fluoride; the chemical fiber fabric is polypropylene Or acrylic.

The high-concentration ammonia-nitrogen wastewater is treated as follows: (1) The catalyst is added in a ratio of 0.2-200 g per ton of high-concentration ammonia-nitrogen wastewater, and then subjected to microwave irradiation; (2) The microwave-treated wastewater is flocculated and filtered, and filtered. Adjusting the liquid _P H value for the biphasic separation membrane treatment, the water can be discharged; wherein the catalyst in the step (1) is composed of iron oxide, zirconium oxide, titanium dioxide, nickel oxide, aluminum oxide, silicon oxide, ferric chloride, polyferric chloride One or more of polyaluminum chloride, polyaluminum silicate, manganese dioxide; microwave irradiation frequency of step (1) is 2450MHz or 915MHz, microwave power is 5~30KW, microwave irradiation is diurnal For l~500s, the flow rate of the wastewater through the microwave field is 0.2~1.8m/s _; wherein the biphasic separation membrane in step (2) is the biphasic separation membrane described above; the biphasic separation in the step (2) The two sides of the membrane are raw material liquid and absorption liquid respectively. The temperature of the raw material liquid is 15~60 °C, the pH value is greater than 9, the absorption liquid is acidic solution, the p H value is less than 2, the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure is strong. The difference is 0.0 1~5Kg/cm2.

The biphasic separation membrane of the invention has high strength and high pressure resistance, can withstand a pressure difference of 5-6 Kg/cm2, and is added with a nano material, and the pollution resistance of the biphasic separation membrane is improved by 2 to 3 times, which is not easy to block, It is easier to clean and can be used for large-scale water treatment.

The preparation method of the biphasic separation membrane of the invention is simple and easy to handle.

The treatment method of the high-concentration ammonia-nitrogen wastewater of the invention utilizes the synergistic action of microwave and catalyst to treat the high-concentration ammonia-nitrogen wastewater, thereby realizing the enhanced flocculation of the high-concentration ammonia-nitrogen wastewater, greatly reducing the concentration of organic matter in the water body, and reducing the subsequent membrane pollution. The possibility of separating the ammonia nitrogen from the water by means of a two-phase separation membrane. The operating cost of the high-concentration ammonia nitrogen wastewater treatment method of the invention is 10-20 yuan/ton, which is only 1/5 of the current method for removing ammonia nitrogen. The treatment method of the high-concentration ammonia nitrogen wastewater of the invention can remove more than 99% of the ammonia nitrogen in the water body, not only greatly reduces the emission of ammonia nitrogen into the water environment, but also effectively recovers the ammonia nitrogen resource, and the acidic absorption liquid can be treated after being treated. Recycling, saving a lot of water resources, reducing production costs by 40% to 90%. The method for treating high-concentration ammonia nitrogen wastewater of the invention has small floor space, convenient operation and management, and is suitable for high-concentration ammonia nitrogen wastewater treatment of various scales. High concentration ammonia nitrogen wastewater of the invention The treatment method does not cause secondary pollution. The treatment method of the high-concentration ammonia nitrogen wastewater of the invention can treat the wastewater with the ammonia nitrogen concentration of 50,000 mg/L, and the daily treatment capacity is 50-6000 tons because the dual-phase separation membrane used has high strength, is not easy to be broken, and the treatment capacity is greatly improved.

[14] Specific implementation

[15] Embodiment 1: The biphasic separation membrane of the present embodiment comprises 98 to 102 parts of a polymer material, 0.001 to 5 parts of a titanium dioxide fiber having a fiber length of 5 to 100 nm, and 0.01 to 3.5 parts of a chemical fiber fabric. Made of; wherein the polymer material is polypropylene or polyvinylidene fluoride; the chemical fiber fabric is polypropylene or acrylic.

[16] The dual phase separation membrane of the present embodiment has high strength and high pressure resistance, and can withstand a pressure difference of 5 to 6 kg/cm2.

[17] Specific embodiment 2: The difference between this embodiment and the first embodiment is: the biphasic separation membrane is composed of 100 parts of the polymer material, 0.01 to 4.8 parts of titanium dioxide having a fiber length of 10 to 50 nm in mass parts ratio. Made of fiber and 0.1 to 3.4 parts of chemical fiber fabric. Others are the same as in the first embodiment.

[18] Specific Embodiment 3: The biphasic separation membrane of the present embodiment is prepared according to the following steps: 98 to 102 parts of polymer material, 0.001 to 5 parts of titanium dioxide fiber having a fiber length of 5 to 100 nm and 0.01 by mass fraction ~3. 5 chemical fiber fabrics are mixed, then stirred at 0~5~8h at 160~240°C and stirring speed of 500~3000r/min. After drying, a two-phase separation membrane is obtained. The polymer material is Polypropylene or polyvinylidene fluoride; chemical fiber fabric is polypropylene or acrylic.

[19] The two-phase separation membrane prepared in the present embodiment has high strength and high pressure resistance, and can withstand a pressure difference of 5 to 6 kg/cm 2 .

[20] Specific Embodiment 4: The difference between this embodiment and the third embodiment is: 100 parts of the polymer material, 0.01 to 4.8 parts of titanium dioxide fiber having a fiber length of 10 to 50 nm and 0.1 3.4 by mass fraction. A portion of the chemical fiber fabric is mixed. The other steps and parameters are the same as in the third embodiment.

[21] Specific Embodiment 5: The difference between the embodiment and the third embodiment is: mixing the polymer polymer material, the nano titanium dioxide fiber and the chemical fiber fabric at 180 to 230 ° C, and the stirring speed is 700 to 2500 r/m. In the case of in, stir for l~6h. The other steps and parameters are the same as in the third embodiment.

[22] Specific Embodiment 6: The high-concentration ammonia-nitrogen wastewater in the present embodiment is treated as follows: (1) adding a catalyst in a ratio of 0.2 to 200 g per ton of high-concentration ammonia-nitrogen wastewater, and then performing microwave irradiation; The microwave treated wastewater is flocculated and precipitated, filtered to adjust the liquid _P H value to be treated by a two-phase separation membrane, and the water can be discharged; wherein the catalyst in the step (1) is composed of iron oxide, zirconium oxide, titanium dioxide, nickel oxide, One or more of alumina, silica, ferric chloride, polyferric chloride, polyaluminum chloride, polyaluminum silicate, manganese dioxide; the microwave irradiation frequency in the step (1) is 2450 MHz or 915MHz, microwave power is 5~30KW, microwave irradiation is 1~500s, and the flow rate of wastewater through microwave field is 0.2~1.8m/s; wherein the dual phase separation membrane in step (2) is the first embodiment The two-phase separation membrane; in the step (2), the two-phase separation membrane is respectively a raw material liquid and an absorption liquid, and the temperature of the raw material liquid is 15 to 60 ° C, the pH value is greater than 9, and the absorption liquid is an acidic solution. The pH value is less than 2, and the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure difference is 0.01 to 5 kg/cm ² .

[23] In the synergistic action of the catalyst, the inorganic nitrogen in the wastewater is inorganicized by the advanced oxidation of the catalyst, and the same flocculation is produced by the same; the organic matter in the wastewater is strengthened and destabilized to form larger flocs and precipitates. And the filter is separated from it. In this embodiment, organic nitrogen in wastewater is converted into ammonia nitrogen, and organic matter is also efficiently removed by enhanced coagulation. The removal rate of macromolecular organic matter (molecular weight is 2000 to 60,000 Daltons) is over 95%, especially capable of interfering with membrane separation. And macromolecular organic matter that pollutes the membrane. The test proves that the stability of the macromolecular organic matter in water is greatly reduced, so that a large floc is easily separated from the water; the main components of the water body (more than 99%) are ammonia nitrogen, inorganic salts and small molecular organic substances. After the treatment by the two-phase separation membrane, water can be discharged.

[24] Ammonia nitrogen has a dissociation equilibrium in water. As the pH of the raw material liquid increases, the proportion of NH ₃ in the raw material liquid increases, at the temperature and pressure of the present embodiment (according to the chemical equilibrium movement principle, That is, L. Chadley (A丄丄E Chatelier) principle) The free ammonia NH ₄ + in the raw material liquid becomes ammonia molecule NH ₃ , and diffuses to the surface of the membrane through the side interface of the raw material liquid, under the action of the partial pressure difference of the membrane surface, Pass through the pores of the membrane, enter the absorption solution, and quickly react with the acidic solution to form an ammonium salt. The biphasic separation membrane used in the embodiment has a microporous structure on the surface made of a nano material, and the separation membrane has a small pore size and a low saturated vapor pressure; in the raw material liquid under the conditions of temperature, pressure and pH defined in the present embodiment. The ammonia nitrogen is rapidly vaporized to form a micro-vapor phase layer in the interfacial layer. The ammonia nitrogen in the gas phase is absorbed on the other side (absorbent side) of the two-phase separation membrane, and the gas-liquid equilibrium is broken, resulting in ammonia nitrogen in the raw material liquid. The ammonia liquid is continuously transferred to the side of the absorption liquid to separate the ammonia nitrogen from the water body. In the present embodiment, the absorption liquid on the side of the two-phase separation membrane can form an ammonium salt having a mass concentration of 20% to 30%, which can be used as a clean industrial raw material after purification, and the acidic absorption liquid can be recycled.

[25] In the present embodiment, the catalyst is composed of two or more components, and each component may be in any ratio. . In the present embodiment, the pH of the raw material liquid is adjusted with sodium hydroxide or potassium hydroxide, and the pH of the absorption liquid is adjusted with hydrochloric acid, nitric acid or sulfuric acid.

[26] Specific Embodiment 7: The difference between this embodiment and the specific embodiment 6 is: Step (2) Before the wastewater flocculates and precipitates, it flows through the electromagnetic emission device, and the frequency of the electromagnetic emission wave is 0.2 kHz to 10 MHz, and the power is 5 mW. ~500W. The other steps and parameters are the same as in the sixth embodiment.

[27] This embodiment can greatly reduce membrane fouling and prevent membrane fouling, and the service life of the two-phase separation membrane is prolonged.

[28] Specific Embodiment 8: The difference between this embodiment and the specific embodiment 6 is: Step (2) The wastewater after flocculation and sedimentation is sequentially filtered through a high-efficiency filter, a bag filter and a precision filter. The other steps and parameters are the same as in the sixth embodiment.

[9] Embodiment 9: The difference between this embodiment and Embodiment 8 is that the filtration rate of the wastewater in the high efficiency filter, the bag filter, and the precision filter is 5 to 40 m/h. The other steps and parameters are the same as in the eighth embodiment.

[30] This embodiment can effectively reduce the degree of contamination and clogging of the membrane and prolong the service life of the dual phase separation membrane.

[31] Specific Embodiment 10: The difference between this embodiment and the specific embodiment 6 is: Step (2) The flocculation sedimentation time is 5 to 50 minutes. The other steps and parameters are the same as in the sixth embodiment.

[32] Specific Embodiment 11: The difference between this embodiment and the specific embodiment 6 is: Step (2)

The 1~10 sets of biphasic separation membranes were treated in series for two-phase separation membrane treatment. There were 2 to 5 columns of biphasic separation membranes in each group, and the biphasic separation membranes in each group were operated in series or in parallel. The other steps and parameters are the same as in the sixth embodiment.

[33] In the present embodiment, a pressurizing pump and a pH adjusting pump are provided in front of each of the two-phase separation membranes to maintain the liquid pressure difference on both sides of the two-phase separation membrane and the pH of the raw material liquid.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Twelfth Embodiment] The difference between this embodiment and Embodiment 6 is: Step (2) The water treated by the two-phase separation membrane is subjected to biological nitrogen removal treatment. The other steps and parameters are the same as in the sixth embodiment.

[35] The ammonia nitrogen content in the effluent of the present embodiment is reduced to l~2 mg/L.

[36] Specific Embodiment 13: The waste water having an ammonia nitrogen concentration of 5000 mg/L in the present embodiment is treated as follows:

(1) Adding a catalyst to a ratio of 0.2 to 200 g per ton of ammonia-nitrogen wastewater, and then performing microwave irradiation;

(2) The microwave treated wastewater is flocculated and precipitated, and the pH of the liquid is adjusted after filtration to carry out the biphasic separation membrane. The effluent can be discharged; wherein the catalyst in the step (1) is iron oxide; in the step (1), the microwave irradiation frequency is 915 MHz, the microwave power is 15 KW, and the microwave irradiation is between 100 and 200 s, and the wastewater passes through the microwave. The flow rate of the field is l~1.8 m/s _; wherein the biphasic separation membrane in the step (2) is the biphasic separation membrane described in the first embodiment; the two phases of the biphasic separation membrane in the step (2) are respectively It is a raw material liquid and an absorption liquid. The temperature of the raw material liquid is 25 ° C, the pH value is 10, the absorption liquid is an acidic solution, the pH value is 1.7, the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure difference is 1 to 3 Kg/cm 2 . .

[37] In the present embodiment, the ammonia nitrogen content in the effluent is ≤5 mg/L, and the ammonia nitrogen removal rate is 99.9%. The recovered ammonia nitrogen can be used as a fertilizer, and the water resources can be recycled.

[38] Specific Embodiment 14: In this embodiment, the foaming agent industry wastewater with ammonia nitrogen concentration of 6800 mg/L is treated as follows: (1) The catalyst is added in a ratio of 1 to 100 g per ton of ammonia nitrogen wastewater, and then Microwave irradiation; (2) The microwave treated wastewater is first flocculated and precipitated, and then filtered through a high-efficiency filter, a bag filter and a precision filter, and then the liquid pH is adjusted for biphasic separation membrane treatment to obtain water; The catalyst in the step (1) is zirconia and titania; in the step (1), the microwave irradiation frequency is 2450 MHz, the microwave power is 20 KW, and the microwave irradiation time is 200-300 s, and the flow rate of the wastewater through the microwave field is 1.2~1.8m/s _; wherein the two-phase separation membrane in the step (2) is the two-phase separation membrane described in the first embodiment; in the step (2), the two-phase separation membrane is respectively a raw material liquid and The absorption liquid, the temperature of the raw material liquid is 25 ° C, the pH value is 11, the absorption liquid is an acidic solution, the pH value is 1.8, the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure difference is 1 to 2.5 Kg/cm 2 ; step B) Group 7 biphasic biphasic separation process for the separation membrane in series, each group has three to four biphasic separation membrane, the separation membrane in each group in series duplex operation.

[39] In the present embodiment, the ammonia nitrogen content in the effluent is ≤10 mg/L, and the ammonia nitrogen removal rate is 99% or more. The waste water treatment scale of the present embodiment is 100 to 5000 tons/day. The catalyst zirconium oxide and titanium dioxide of the present embodiment may be in any ratio.

[40] Embodiment 15: In the present embodiment, the wastewater of the rare earth processing industry having an ammonia nitrogen concentration of 3000 to 15000 mg/L is treated as follows: (1) The catalyst is added in a ratio of 10 to 50 g per ton of ammonia nitrogen wastewater, and then Microwave irradiation; (2) The microwave treated wastewater is first flocculated and precipitated, and then filtered through a high-efficiency filter, a bag filter and a precision filter, and then the liquid pH is adjusted for biphasic separation membrane treatment, and the water can be discharged. Wherein the catalyst in step (a) is silica, ferric chloride, polyferric chloride and Manganese dioxide; in the step (1), the microwave irradiation frequency is 2450MHz, the microwave power is 10~25KW, the microwave irradiation time is 200~500s, and the flow rate of the wastewater through the microwave field is 1.2~1.8m/s _; The two-phase separation membrane in the step (the two-phase separation membrane described in the first embodiment); in the step, the two-phase separation membrane is respectively a raw material liquid and an absorption liquid, and the temperature of the raw material liquid is 20 ° C, pH The value is 10, the absorption liquid is an acidic solution, the pH value is 1.8, the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure difference is 0.01 l~2 Kg/cm ² ; in the step (2), five sets of dual-phase separation membranes are connected in series. The two-phase separation membrane treatment was carried out, and there were ₃ to ₄ columns of biphasic separation membranes in each group, and the biphasic separation membranes in each group were operated in parallel.

[41] In the present embodiment, the ammonia nitrogen content in the effluent is ≤25 mg/L, and the ammonia nitrogen removal rate is 99% or more. The waste water treatment scale of the present embodiment is 100 to 6000 tons/day. The catalyst silica, iron chloride, polyferric chloride and manganese dioxide in the present embodiment may be in any ratio.

[42] Specific Embodiment 16: In this embodiment, the wastewater of the fertilizer plant with the ammonia nitrogen concentration of 10000~50000mg/L is treated as follows: (1) The catalyst is added in a ratio of 15-20g per ton of ammonia nitrogen wastewater, and then Microwave irradiation; (2) The microwave treated wastewater is first flocculated and precipitated, then filtered by microfiltration or ultrafiltration, and then the liquid pH is adjusted for biphasic separation membrane treatment to obtain water; wherein the catalyst in step (1) Is iron oxide, zirconium oxide, titanium dioxide, nickel oxide, aluminum oxide, silicon oxide, ferric chloride, polyferric chloride, polyaluminum chloride, polyaluminum silicate or manganese dioxide; microwave irradiation in the step (1) The frequency is 915MHz, the microwave power is 10~25KW, the microwave irradiation time is 100~400s, and the flow rate of wastewater through the microwave field is 1.2~1.6m/s _. The biphasic separation membrane in step (2) is the specific implementation method. The two-phase separation membrane described in the above; in the step (2), the two-phase separation membrane is respectively a raw material liquid and an absorption liquid, and the temperature of the raw material liquid is 30 ° C, the pH value is 12, and the absorption liquid is an acidic solution. , pH value 1.8, the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure difference is 0.01~3.5Kg/cm ² ; in the step (2), 6 sets of dual-phase separation membranes are serially processed by the double-phase separation membrane, and each group has 3~ Four columns of two-phase separation membranes, and the two-phase separation membranes in each group were operated in series.

[43] In the present embodiment, the ammonia nitrogen content in the effluent is ≤15 mg/L, and the ammonia nitrogen removal rate is 99% or more. The waste water treatment scale of this embodiment is 50 1,000 tons / day.

[44] BEST MODE FOR CARRYING OUT THE INVENTION Seventeenth: The difference between this embodiment and the specific embodiment 6 is: In step (2), the pressure difference between the raw material liquid and the absorption liquid is l~4Kg/cm2. The other steps and parameters are the same as in the sixth embodiment.

[45] Embodiment 18: The difference between this embodiment and the specific embodiment 6 is: Step (2) The pressure difference between the raw material liquid and the absorption liquid is 2 to 3 kg/cm 2 . The other steps and parameters are the same as in the sixth embodiment.

[19] Specific embodiment 19: The difference between this embodiment and the specific embodiment 6 is: The temperature of the raw material liquid in the step (2) is 20 to 55 °C. The other steps and parameters are the same as in the sixth embodiment.

[47] Embodiment 20: The difference between this embodiment and Embodiment 6 is as follows: In step (2), the temperature of the raw material liquid is 30 to 50 °C. The other steps and parameters are the same as in the sixth embodiment.

[48] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 21: The difference between this embodiment and the specific embodiment 6 is: Step (2), 1~3 sets of dual-phase separation membranes are processed in series for two-phase separation membrane treatment, and each group has 2~ Three columns of two-phase separation membranes, and the two-phase separation membranes in each group are operated in series or in parallel. The other steps and parameters are the same as in the sixth embodiment.

Claims

Claim

1. A two-phase separation membrane characterized in that the biphasic separation membrane is composed of 98 to 102 parts of a polymer material, 0.001 to 5 parts of a titanium dioxide fiber having a fiber length of 5 to 100 nm, and 0.01 to 3.5 parts of a chemical fiber fabric. The polymer material is polypropylene or polyvinylidene fluoride; the chemical fiber fabric is polypropylene or acrylic.

2. The biphasic separation membrane according to claim 1, wherein the biphasic separation membrane is composed of 100 parts by mass of the polymer material, 0.01 to 4.8 parts of titanium dioxide fiber having a fiber length of 10 to 50 nm, and 0.1 to 2 parts by mass. 3.4 parts made of chemical fiber fabric.

3. A method of preparing a dual phase separation membrane according to claim 1, wherein the dual phase separation membrane is prepared according to the following steps: 98 to 102 parts by weight of the polymer material, and 0.001 to 5 parts of fiber length. The 5~100nm titanium dioxide fiber is mixed with 0.01~3.5 parts of chemical fiber fabric, and then stirred at 160~240 °C for 500~3000r/min for 0.5~8h, and dried to form a biphasic separation film; The molecular polymeric material is polypropylene or polyvinylidene fluoride; the chemical fiber fabric is polypropylene or acrylic.

4. A method for treating high-concentration ammonia-nitrogen wastewater, characterized in that the high-concentration ammonia-nitrogen wastewater is treated according to the following steps: (1) adding a catalyst in a ratio of 0.2 to 200 g per ton of high-concentration ammonia-nitrogen wastewater, and then performing microwave irradiation. (2) The microwave treated wastewater is flocculated and precipitated, filtered to adjust the pH of the liquid to be treated by a two-phase separation membrane, and the water can be discharged; wherein the catalyst in the step (1) is composed of iron oxide, zirconium oxide, titanium dioxide, nickel oxide, One or more of alumina, silica, ferric chloride, polyferric chloride, polyaluminum chloride, polyaluminum silicate, manganese dioxide;

(1) The frequency of microwave irradiation is 2450MHz or 915MHz, the microwave power is 5~30KW, the microwave irradiation time is l~500s, and the flow rate of wastewater through microwave field is 0.2~1.8m/s _{; in} step (2) The two-phase separation membrane is the two-phase separation membrane according to claim 1; in the step (2), the two-phase separation membrane is respectively a raw material liquid and an absorption liquid, and the temperature of the raw material liquid is 15 to 60 ° C, The pH value is greater than 9, the absorption liquid is an acidic solution, the pH value is less than 2, the pressure of the raw material liquid is stronger than the pressure of the absorption liquid, and the pressure difference is 0.01 to 5 kg/cm ² .

The method for treating high-concentration ammonia nitrogen wastewater according to claim 4, characterized in that the wastewater after flocculation and precipitation in the step (2) is sequentially passed through a high-efficiency filter, a bag filter and a precision filter. The filter is completely filtered.

6. A method for treating high concentration ammonia nitrogen wastewater according to claim 5, wherein the waste water has a filtration rate of 5 to 40 m/h in the high efficiency filter, the bag filter and the precision filter.

The method for treating high-concentration ammonia nitrogen wastewater according to claim 4, characterized in that in the step (2), the flocculation and sedimentation time is 5 to 50 minutes.

The method for treating high-concentration ammonia-nitrogen wastewater according to claim 4, wherein in the step (2), 1 to 10 sets of dual-phase separation membranes are serially processed by a dual-phase separation membrane, and each group has 2 to 5 A column of biphasic separation membranes, the biphasic separation membranes in each group operating in series or in parallel.

A method for treating high-concentration ammonia nitrogen wastewater according to claim 4, wherein the water treated by the two-phase separation membrane in the step (2) is subjected to biological nitrogen removal treatment.

The method for treating high-concentration ammonia nitrogen wastewater according to claim 4, wherein the pressure difference between the raw material liquid and the absorption liquid in the step (2) is 1 to 4 Kg/cm ² .