CN103193295B - Immersed dissolved gas vacuum membrane distillation water processing method - Google Patents
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Abstract
The invention relates to an immersed dissolved gas vacuum membrane distillation water processing method. The method comprises the following steps: immersing a distillation membrane distillation assembly in a heating water box, dissolving a gas in inlet water through adopting a gas dissolving pump, and effectively removing pollutants in the inlet water through vacuum membrane distillation in order to realize the separation and concentration of the pollutants in the inlet water. The method has the advantages of simple required equipment, uniform gas-liquid mixing, low energy consumption and cost, simple operation, good membrane pollution resistance and long running period. The method can effectively remove a large amount of salts, a small amount of COD and other pollutants in the wastewater, reduce the sewage discharge amount and realize the efficient utilization of a water resource when the method is used for processing reverse osmosis concentrated water of wastewater generated in the production of an olefin polymerization catalyst.
Description
Technical field
The present invention relates to water treatment and technical field of membrane separation, specifically, the present invention relates to a kind of immersion air-dissolved vacuum membrane distillation treatment process of reverse osmosis concentrated water, more particularly, the present invention relates to a kind of air-dissolved vacuum membrane distillation treatment for reuse method of reverse osmosis concentrated water of petrochemical enterprises.
Background technology
In recent years, in order to respond the call that national energy-saving reduces discharging, the two membrane process of petroleum chemical enterprise's waste water many employings ultrafiltration/reverse osmosis carries out reuse after advanced treatment, substantially meets the water demand of upstream production process.But consequent reverse osmosis concentrated water becomes a process difficult problem, this strand of waste water can not discharge can not reuse, brings great puzzlement to each enterprise.
Membrane distillation is paid attention to owing to can removing the salinity of greater concn and higher ratio of desalinization and being subject to various countries expert gradually and expands extensive research, and it can desalting efficiency is the highest up to now at last membrane technique, and ratio of desalinization is up to more than 99%.Membrane distillation is the eighties in last century is the hydrophobic membrane technology that sea water desalinization is researched and developed, and it adopts microporous hydrophobic membrane, a kind of Aspect of some new membrane processes being motivating force with film both sides steam pressure difference.
Membrane distillation film used is not by the dewatering microporous film of pending solution-wet, and namely only have steam to enter fenestra, liquid can not through fenestra.According to the difference of vapor diffusion to film cold side condensing mode, membrane distillation generally can be divided into Four types: direct contact membrane distillation (DCMD), gap field orientation (AGMD), vacuum type membrane distillation (VMD), sweep gas membrane disillation (SGMD).Wherein VMD is the membrane process of constant temperature, and film is through side vacuum pump evacuation, and with the steam pressure difference causing film both sides larger, Volatile Colstituent draws rear condensation from cold side, and the heat conduction loss of this membrane distillation process is less, substantially can ignore.
In the feeding liquid of VMD process, entrained gas is the method that this area is more concerned in recent years.Patent CN 101659451A relates to a kind of method for treating high-salt water by air stripping type membrane distillation, the method adopts the direct contact membrane distillation of hollow fiber film assembly, the air that sewage produces through hydrothermal circulation pump and air compressor machine or blower fan after raw water box heating forms biphase gas and liquid flow and enters film high-temp. side, membrane permeation side adopts recycle pump to circulate water of condensation and will be transported to product water tank through the steam of film and condensation of gas, not through the concentrate recirculation of film to raw water box.Plenum system is stop ram charging by the standard width of a room in an old-style house between magnetic valve, adopts the shortcoming of ram charging to be, comparatively large to the impact of film itself, and cause mixing wastewater with air inequality and stripping effect discontinuous, the operation of inlet side is also impacted.
Patent CN 101664642A and document " research of air-blowing vacuum membrane still-process " (water technology, 2009,35 (12), 34 ~ 37) a kind of air-blowing vacuum membrane distillation apparatus and method are also related to, these apparatus and method adopt the vacuum membrane distillation of hollow fiber film assembly, the mode of vacuumizing is that inner pressed and tube side vacuumize, and sewage is walked in tubular fibre fenestra.The method also blasts low-pressure compressed air and sewage forms biphase gas and liquid flow in hollow fiber film assembly ingress, and former water does not comprise wastewater from chemical industry, and does not limit operational condition.
In addition, patent CN1526650 relates to a kind of film distilling seawater desalination system of high-efficiency and low-cost, this patent connects the comparatively complicated frothing machine of a structure raising water loop, as micro bubble gasifying device, gas under pressure supply was provided with before this device, the preheating gas under pressure that this device provides becomes the working liquid with high temperature with sea water mixing, this working liquid carries out size degradation emulsification by micro bubble gasifying device, water molecules wherein becomes miniaturization because of a large amount of aeration, and the relative quantity of steam produced increases.This patent need be more with equipment, and structure is comparatively complicated, and operating process is complicated, and production cost is higher, and energy consumption is comparatively large, and the mould material pore size adopted is 0.001 ~ 0.005 μm.Further, the membrane distillation system for handling that patent CN1526650 provides is seawater.
What above-mentioned film distillation technology adopted is chlamydate hollow-fibre membrane, and be external placed type operation, although membrane distillation type is different, sewage is all walked in tubular fibre fenestra, and the shell side of membrane module forms vacuum or condensation system.The shortcoming of this kind of mode is because film silk is comparatively thin, and easily cause dirty stifled in membrane module ingress and film silk, concentration polarization impact is comparatively large, easily forms fouling membrane, and the membrane module not easy cleaning after polluting.In addition, owing to adopting external placed type operation, heat is partial loss in Pipeline transport process, and heat utilization ratio is low, and excessive tolerance easily causes the reduction of per-meate side vacuum tightness, increases energy consumption.Above-mentioned patent all adopts air compressor machine or blower fan to blast air, the bubble that air compressor machine or blower fan produce is comparatively large, enters membrane module after mixing with sewage in pipeline, due to pipeline restriction, the dispersiveness of gas in water may be caused bad, and air water mixes the problems such as uneven.
What membrane distillation adopted is microporous hydrophobic membrane, and based on the mass transport mechanism of microporous hydrophobic membrane, the contamination resistance of membrane distillation is comparatively strong, but also inevitably forms fouling membrane, and the pollution of membrane distillation microporous hydrophobic membrane used is mainly film surface pollution, and fenestra internal contamination is relatively less.Handled by membrane distillation, be generally the lower high salt sewage of suspension content, as systems such as reverse osmosis concentrated waters, therefore, the fouling membrane of membrane distillation process is mainly salt-pepper noise that concentration polarization causes, fouling and Organic pollutants.So in membrane distillation process, concentration polarization is a very important influence factor, avoid or reduce as far as possible.
Therefore, for current Problems existing, need to develop a kind of required equipment simple, gas-liquid mixed is even, and in operational process, heat conduction loss is few, energy consumption is low, easy and simple to handle, both can well preventing membrane pollution, film can be reduced again and soak, reduce impact, the cycle of operation of membrane component and prolong and the reverse osmosis concentrated water membrane distillation treatment technology in work-ing life of concentration polarization and temperature difference polarization.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of immersion molten gas vacuum membrane distillation water treatment method.Membrane component is immersed in heating water tank by the method, adopts air dissolved pump to dissolve in gas simultaneously in feeding side waste water, effectively removes the pollutent in dense water, realize the isolation and identification of dense water pollutant by vacuum membrane distillation.The method required equipment is simple, and gas-liquid mixed is even, energy consumption and cost lower, easy and simple to handle, preventing membrane pollution performance is good, and the cycle of operation is long.For the treatment of the reverse osmosis concentrated water of method of wastewater in olefin polymerization catalyst production, effectively can remove a large amount of salinities in waste water, a small amount of COD and other pollutent, reduce quantity of wastewater effluent, achieve the efficiency utilization of water resources.
For this reason, the invention provides a kind of immersion molten gas vacuum membrane distillation water treatment method, comprising:
Steps A, water inlet and gas and vapor permeation form influent gas liquid mixture;
Step B, influent gas liquid mixture enters heating water tank, is heated to the influent gas liquid mixture that preset temperature obtains preset temperature;
Step C, vacuumizes formation negative pressure in membrane component through side;
Step D, through under the vacuum action of side, the fenestra of the gas in the influent gas liquid mixture of preset temperature, steam permeable membrane distillation assembly, and produce water forming membrane distillation through side condensation;
Wherein, gas is dissolved in into water formation influent gas liquid mixture by air dissolved pump by steps A.
According to the inventive method, gas described in steps A is one in nitrogen, oxygen or air or two kinds; In described influent gas liquid mixture, the volume ratio of gas and liquid is 0.01: 1 ~ 0.5: 1.In preferred described influent gas liquid mixture, the volume ratio of gas and liquid is 0.08: 1 ~ 0.2: 1.
According to the inventive method, water inlet described in steps A comprises from the reverse osmosis concentrated water of reverse osmosis system, high salt sewage, seawater etc., and described inlet flow-patterm is 6.5 ~ 8.5, and preferred described inlet flow-patterm is 7 ~ 8.
According to the inventive method, the liquid mixture of influent gas described in step B enters heating water tank by air dissolved pump.
According to the inventive method, the preset temperature of intaking described in step B is 45 ~ 95 DEG C.The preset temperature of preferred described water inlet is 65 ~ 85 DEG C.
According to the inventive method, described in step C, membrane component is immersed in heating water tank.Membrane component described in step C comprises hollow fiber curtain type membrane component or plate and frame module.The mould material of described membrane component is polyvinylidene difluoride (PVDF), tetrafluoroethylene or polypropylene microporous mould material.Wherein, the pore diameter range of described microporous membrane material is 0.1 ~ 0.5 μm, and the pore diameter range of preferred described microporous membrane material is 0.15 ~ 0.22 μm.
According to the inventive method, in step C, membrane component is-0.01 ~-0.1MPa through wall pressure.Preferred described membrane component be-0.085 ~-0.1MPa through wall pressure.
According to the inventive method, after the fenestra of the gas in the liquid mixture of influent gas described in step D, steam permeable membrane distillation assembly, condensation forms membrane distillation and produces water under through side condenser effect.
According to the inventive method, the dense water periodic exhaustion of the membrane distillation that the process of membrane distillation described in step D produces focuses on.
In the present invention, the thermal source of membrane distillation system can adopt factory's low-temperature waste heat, exhaust steam to heat or electrically heated, or in order to reduce energy consumption, makes full use of periphery used heat.According to the present invention, the cycles of concentration of described vacuum membrane distillation system controls at about 5 ~ 7 times.Adopt according to the immersion of the inventive method molten gas vacuum membrane distillation system process reverse osmosis concentrated water, the operating flux scope of membrane distillation is 5 ~ 25L/m
2h, membrane distillation ratio of desalinization is higher than 99%.
The essential distinction of the present invention and prior art is, the present invention relates to a kind of immersion molten gas vacuum membrane distillation water treatment method.Different from immersion ultra-filtration process, the fouling membrane of ultra-filtration process is mainly the cake layer pollution, colloid pollution etc. that the macromole such as suspended substance or large particulate matter cause.Therefore, immersion ultrafiltration is polluted to remove or prevent the macromole of suspended substance, colloid etc., and the aeration rate of requirement is comparatively large, and this just easily causes the fracture of wire phenomenon of membrane module in immersion ultra-filtration process.And be generally the lower high salt sewage of suspension content handled by membrane distillation process, as systems such as reverse osmosis concentrated waters, the fouling membrane of membrane distillation process is mainly salt-pepper noise that concentration polarization causes, fouling and Organic pollutants.Therefore, submerged membrane still-process mainly in order to avoid or the concentration polarization that reduces in sewage and temperature difference polarization, tolerance needed for it is less than immersion ultrafiltration, and the present invention is referred to as molten gas, the fracture of wire phenomenon that lower tolerance suppresses or decreases in submerged membrane still-process; Meanwhile, less tolerance is not easy the reduction causing per-meate side vacuum tightness, therefore can reduce energy consumption.
Compared with conventional external vacuum membrane distillation, enter water and air in immersion vacuum membrane distillation process fully to mix in heating water tank, gas-liquid mixed is more even, along with constantly concentrating of membrane distillation process, water inlet can fully be mixed in time, reduces the impact of concentration polarization and temperature difference polarization, decrease fouling membrane, meanwhile, immersion vacuum membrane distillation is low to water inlet pre-processing requirements, and can reduce the calorific loss in Pipeline transport process.
Compared with conventional vacuum membrane distillation, molten gas vacuum membrane distillation dissolves in gas in vacuum membrane distillation hot side water inlet, reduce steam partial pressure, be conducive to removing more impurity with less transmembrane pressure, and make hot film surface more easily form one deck air film, reduce water and organic solvent to the wetting impact of hydrophobic membrane, decrease fouling membrane, and enhance into the perturbation action in water, decrease the condensation of steam in fenestra simultaneously, extend the cycle of operation of membrane module, improve the operating flux of film.
The present invention compares with patent CN 101659451A, and the present invention adopts vacuum membrane distillation, and flux of membrane distillation is higher, and heat conduction loss is less, with patent CN 101659451A, CN101664642A and document " research of air-blowing vacuum membrane still-process " (water technology, 2009, 35 (12)) compare, the present invention adopts air dissolved pump to dissolve in micro-bubble in water inlet, compared with the air produced with air compressor machine or blower fan, the present invention adopts air dissolved pump to provide gas, can be formed less, evenly bubble, the micro bubble particle diameter that air dissolved pump produces is about 20 ~ 40 μm, gas and liquid dissolves efficiency are up to 80 ~ 100%, the more fully contact of gas-liquid two-phase improves flux of membrane distillation, reduce the impact of concentration polarization and temperature difference polarization, decrease fouling membrane, improve membrane distillation system recoveries rate, extend cleaning interval and the work-ing life of film.
Adopt the inventive method to carry out the process of degree of depth membrane distillation to reverse osmosis concentrated water, can make full use of the low grade heat energy of system periphery, the height realizing reverse osmosis concentrated water is recycled, recycle-water resource to greatest extent; Therefore, particularly preferred, the handling object of the inventive method is mainly as reverse osmosis concentrated water of petrochemical enterprises, and this waste water saltiness is high, and its concrete water quality situation is in table 1.
Table 1 reverse osmosis concentrated water of petrochemical enterprises water quality
Reverse osmosis concentrated water after the inventive method process, membrane distillation produces water power and leads≤3 μ S/cm, produces water COD
mn< 3mg/L, Water Sproading rate is higher than 80%, and membrane distillation produces water and can be used as production technique water or de-salted water, achieves the recycling of high salt sewage.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Fig. 1 is the process flow diagram of embodiment 1 ~ 5
Fig. 2 is the process flow diagram of comparative example 1
Fig. 3 is the process flow diagram of comparative example 2
In Fig. 1 and Fig. 2, the implication of Reference numeral is as follows: 1 immersion molten gas vacuum membrane distillation system; The non-molten gas vacuum membrane distillation system of 1 ' immersion; 2 liquid meters; 3 gas meters; 4 air dissolved pumps; 4 ' fresh feed pump; 5 heating water tank; 6 membrane component; 8 membrane component are through side; 9 condensers; 10 gas-liquid separators; 11 surge tanks; 12 vacuum pumps; 13 produce water pot; 14 water inlets; 15 gases; 16 influent gas liquid mixtures; The influent gas liquid mixture of 17 preset temperatures; The water inlet of 17 ' preset temperature; 18 water vapors and other gases; 19 membrane distillations produce water; The dense water of 20 membrane distillation.
" the non-molten gas vacuum membrane distillation system of external placed type that in Fig. 3, the implication of Reference numeral is as follows: 1; 2 liquid meters; 4 " fresh feed pumps; 5 heating water tank; 6 membrane component; The 7 hot sides of membrane component; 8 membrane component are through side; 9 condensers; 10 gas-liquid separators; 11 surge tanks; 12 vacuum pumps; 13 produce water pot; 14 water inlets; 17 " water inlet of preset temperature; 18 water vapors and other gases; 19 membrane distillations produce water; The dense water of 20 membrane distillation.
Embodiment
Describe the present invention in detail below in conjunction with embodiment and accompanying drawing, these embodiments and accompanying drawing only play illustrative effect, are not limited to range of application of the present invention.
In Fig. 1, pH be 6.5 ~ 8.5 water inlet 14 through liquid meter 2 measure after with measure through gas meter 3 after gas 15 by air dissolved pump 4 with 0.01: 1 ~ 0.5: 1 volume ratio be mixed to form influent gas liquid mixture 16, enter heating water tank 5 and be heated to preset temperature, the preset temperature obtained is that the influent gas liquid mixture 17 of 45 ~ 95 DEG C enters the membrane component 6 be immersed in heating water tank 5, membrane component 6 through side 8 by vacuum pump 12 via condenser 9, gas-liquid separator 10 and surge tank 11 vacuumize the negative pressure forming-0.01 ~-0.1MPa, through under the vacuum action of side 8, preset temperature is the gas in the influent gas liquid mixture 17 of 45 ~ 95 DEG C, the fenestra of steam permeable membrane distillation assembly 6 is forming water vapor and other gases 18 through side 8, water vapor and other gas 18 are by condenser 9 condensation, and through gas-liquid separator 10 formed membrane distillation produce water 19 enter produce water pot 13, then go with water spot, membrane distillation dense water 20 periodic exhaustion focuses on.
In Fig. 2, pH be 6.5 ~ 8.5 water inlet 14 enter heating water tank 5 by fresh feed pump 4 ' and be heated to preset temperature after liquid meter 2 measures, the preset temperature obtained is that the water inlet 17 ' of 45 ~ 95 DEG C enters the membrane component 6 be immersed in heating water tank 5, membrane component 6 through side 8 by vacuum pump 12 via condenser 9, gas-liquid separator 10 and surge tank 11 vacuumize the negative pressure forming-0.01 ~-0.1MPa, through under the vacuum action of side 8, preset temperature is the gas in the water inlet 17 ' of 45 ~ 95 DEG C, the fenestra of steam permeable membrane distillation assembly 6 is forming water vapor and other gases 18 through side 8, water vapor and other gas 18 are by condenser 9 condensation, and through gas-liquid separator 10 formed membrane distillation produce water 19 enter produce water pot 13, then go with water spot, membrane distillation dense water 20 periodic exhaustion focuses on.
In Fig. 3, pH be 6.5 ~ 8.5 water inlet 14 enter heating water tank 5 and be heated to preset temperature, the preset temperature obtained is that the water inlet 17 " by fresh feed pump 4 after liquid meter 2 measures " of 45 ~ 95 DEG C enters membrane component 6 from the hot side 7 of membrane component 6, membrane component 6 through side 8 by vacuum pump 12 via condenser 9, gas-liquid separator 10 and surge tank 11 vacuumize the negative pressure forming-0.01 ~-0.1MPa, through under the vacuum action of side 8, the water inlet 17 that preset temperature is 45 ~ 95 DEG C " in gas, the fenestra of steam permeable membrane distillation assembly 6 is forming water vapor and other gases 18 through side 8, water vapor and other gas 18 are by condenser 9 condensation, and through gas-liquid separator 10 formed membrane distillation produce water 19 enter produce water pot 13, then go with water spot, heating water tank 5 can be circulated back to or periodic exhaustion focuses on as a part for water inlet after the dense water 20 of membrane distillation leaves membrane component 6.
Embodiment
Embodiment 1:
The reverse osmosis concentrated water of certain petroleum chemical enterprise, main water quality characteristic is: sewage pH 8, conductance 25mS/cm, COD
cr242mg/L, Ca
2+214mg/L, Mg
2+227mg/L, Na
+5078mg/L, Cl
-8407mg/L, molten silicon 36mg/L, NH
4-N 2mg/L, turbidity 2NTU.Process flow diagram is shown in Fig. 1.
Membrane component used is tetrafluoroethylene plate and frame hydrophobic membrane assembly, and membrane pore size is 0.2 μm.
Flow process is as follows: first, and dissolve in by air dissolved pump the air formation influent gas liquid mixture that gas-liquid volume ratio is 0.08: 1 as in the reverse osmosis concentrated water of the pH 8 of water inlet, water inlet is measured respectively by liquid meter and gas meter with the amount of air; Influent gas liquid mixture enters heating water tank under air dissolved pump effect, enters the membrane component be immersed in heating water tank and carry out membrane distillation after being heated to preset temperature 75 DEG C; By vacuum pump via condenser, gas-liquid separator and the surge tank negative pressure vacuumizing formation-0.1MPa through side to membrane component; Then, under the effect vacuumized through side, the fenestra of the gas in influent gas liquid mixture, steam permeable membrane distillation assembly, by condenser condenses, and enters product water pot through gas-liquid separator formation membrane distillation product water, then goes with water spot; The dense water periodic exhaustion of membrane distillation in heating water tank centrally disposes.
Under this operational condition, the membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
Embodiment 2:
The main water quality characteristic of reverse osmosis concentrated water of certain petroleum chemical enterprise is with embodiment 1.Process flow diagram is shown in Fig. 1.
Embodiment 2 membrane distillation process is as different from Example 1: the pH as water inlet be in the reverse osmosis concentrated water of 8 by air dissolved pump dissolve in gas-liquid volume ratio be 0.12: 1 air form influent gas liquid mixture, other membrane distillation treatment condition are identical with embodiment 1.
The membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
Embodiment 3:
The main water quality characteristic of reverse osmosis concentrated water of certain petroleum chemical enterprise is with embodiment 1.Process flow diagram is shown in Fig. 1.
Embodiment 3 membrane component used is polypropylene hollow fiber curtain hydrophobic membrane assembly, and membrane pore size is 0.2 μm.Its membrane distillation process is as different from Example 1: as in the reverse osmosis concentrated water of water inlet by air dissolved pump dissolve in gas-liquid volume ratio be 0.12: 1 air form influent gas liquid mixture, to the negative pressure vacuumizing formation-0.1MPa through side (in hollow fiber film assembly fenestra) of membrane component, other membrane distillation treatment condition are identical with embodiment 1.
The membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
Embodiment 4:
The main water quality characteristic of reverse osmosis concentrated water of certain petroleum chemical enterprise is with embodiment 1.Process flow diagram is shown in Fig. 1.
Embodiment 4 membrane component used is polypropylene hollow fiber curtain hydrophobic membrane assembly, and membrane pore size is 0.15 μm.Its membrane distillation process is as different from Example 1: the pH as water inlet be in the reverse osmosis concentrated water of 8 by air dissolved pump dissolve in gas-liquid volume ratio be 0.2: 1 air form influent gas liquid mixture, to the negative pressure vacuumizing formation-0.1MPa through side (in hollow fiber film assembly fenestra) of membrane component, other membrane distillation treatment condition are identical with embodiment 1.
The membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
Embodiment 5:
The main water quality characteristic of reverse osmosis concentrated water of certain petroleum chemical enterprise is with embodiment 1.Process flow diagram is shown in Fig. 1.
Embodiment 5 membrane distillation process is as different from Example 1: as in the reverse osmosis concentrated water of water inlet by air dissolved pump dissolve in gas-liquid volume ratio be 0.12: 1 air form influent gas liquid mixture, to the negative pressure vacuumizing formation-0.085MPa through side of membrane component, other membrane distillation treatment condition are identical with embodiment 1.
The membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
Comparative example 1:
The main water quality characteristic of reverse osmosis concentrated water of certain petroleum chemical enterprise is with embodiment 1.Process flow diagram is shown in Fig. 2.
Comparative example 1 membrane distillation process is as different from Example 1: after being measured by liquid meter as the reverse osmosis concentrated water of water inlet, directly enter heating water tank, enter the membrane component be immersed in heating water tank and carry out membrane distillation after being heated to preset temperature 75 DEG C; Other membrane distillation treatment condition are identical with embodiment 1.
The membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
Embodiment 1,2 and 5 and comparative example 1 are the immersion vacuum membrane distillation adopting tetrafluoroethylene plate and frame hydrophobic membrane assembly, and both are in difference, and embodiment 1,2 and 5 has carried out molten gas, and comparative example 1 does not carry out molten gas.Compared with comparative example 1, under identical cycles of concentration, the flux of membrane distillation of embodiment 1,2 and 5 and the cycle of operation, the fouling membrane of comparative example 1 was very fast all higher than comparative example 1, the cleaning frequency of comparative example 1 is higher than embodiment 1,2 and 5, and cleaning will cause film shortening in work-ing life continually.
Comparative example 2:
The main water quality characteristic of reverse osmosis concentrated water of certain petroleum chemical enterprise is with embodiment 1.Process flow diagram is shown in Fig. 3.
Comparative example 2 membrane component used is polypropylene hollow fiber hydrophobic membrane assembly, and membrane pore size is 0.2 μm.Its membrane distillation process is as different from Example 1: the reverse osmosis concentrated water as water inlet directly enters heating water tank and is heated to preset temperature 75 DEG C, after liquid meter metering, enter membrane component by fresh feed pump and carry out membrane distillation, the flow velocity of water inlet is 0.6m/s; To the negative pressure vacuumizing formation-0.1MPa through side (in hollow fiber film assembly fenestra) of membrane component, other membrane distillation treatment condition are identical with embodiment 1.
The membrane distillation treatment effect of reverse osmosis concentrated water is in table 2.
The membrane distillation treatment effect of table 2 reverse osmosis concentrated water
Embodiment 3 is with 4 compared with comparative example 2, and embodiment 3 and 4 adopts immersion molten gas tubular fibre membrane distillation, and comparative example 2 adopts external placed type tubular fibre membrane distillation, and comparative example 2 does not carry out molten gas, and both vacuumize mode and are in hollow-fibre membrane fiber holes and vacuumize.Compared with comparative example 2, under identical cycles of concentration, the flux of membrane distillation of embodiment 3 and 4 and the cycle of operation, visible molten gas reduced fouling membrane, decreases the cleaning of membrane module all higher than comparative example 2.Further, immersion operation is adopted to decrease the thermosteresis of pipeline.
Claims (10)
1. an immersion molten gas vacuum membrane distillation water treatment method, comprising:
Steps A, water inlet and gas and vapor permeation form influent gas liquid mixture;
Step B, influent gas liquid mixture enters heating water tank, is heated to the influent gas liquid mixture that preset temperature obtains preset temperature;
Step C, vacuumizes formation negative pressure in membrane component through side;
Step D, through under the vacuum action of side, the fenestra of the gas in the influent gas liquid mixture of preset temperature, steam permeable membrane distillation assembly, and produce water forming membrane distillation through side condensation;
Wherein, gas dissolves in into water formation influent gas liquid mixture by air dissolved pump by steps A;
The micro bubble particle diameter that described air dissolved pump produces is 20 ~ 40 μm, and gas and liquid dissolves efficiency are up to 80 ~ 100%;
In described influent gas liquid mixture, the volume ratio of gas and liquid is 0.08:1 ~ 0.2:1;
Water inlet described in steps A is the reverse osmosis concentrated water from reverse osmosis system;
The operating flux scope of described membrane distillation is 5 ~ 25L/m
2h;
Described reverse osmosis concentrated water is reverse osmosis concentrated water of petrochemical enterprises, and its water quality situation is as follows:
Described membrane distillation produces water conductivity≤3 μ S/cm, and described membrane distillation produces water COD
mn<3mg/L.
2. method according to claim 1, is characterized in that: gas described in steps A is one in nitrogen, oxygen or air or two kinds.
3. method according to claim 1, is characterized in that: the liquid mixture of influent gas described in step B enters heating water tank by air dissolved pump.
4. method according to claim 1, is characterized in that: the preset temperature of intaking described in step B is 45 ~ 95 DEG C.
5. method according to claim 4, is characterized in that: the preset temperature of described water inlet is 65 ~ 85 DEG C.
6. method according to claim 1, is characterized in that: described in step C, membrane component is immersed in heating water tank.
7. method according to claim 1, is characterized in that: membrane component described in step C comprises hollow fiber curtain type membrane component or plate and frame module; The mould material of described membrane component is polyvinylidene difluoride (PVDF), tetrafluoroethylene or polypropylene microporous mould material; Wherein, the pore diameter range of described microporous membrane material is 0.1 ~ 0.5 μm.
8. method according to claim 7, is characterized in that: the pore diameter range of described microporous membrane material is 0.15 ~ 0.22 μm.
9. method according to claim 1, is characterized in that: membrane component described in step C be-0.01 ~-0.1MPa through wall pressure.
10. method according to claim 9, is characterized in that: described membrane component be-0.085 ~-0.1MPa through wall pressure.
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| CN103803669A (en) * | 2013-12-26 | 2014-05-21 | 许昌学院 | Desalination device and desalination method for brackish water and seawater through air purging and vacuum membrane distillation |
| CN111285431A (en) * | 2020-03-27 | 2020-06-16 | 中国华能集团清洁能源技术研究院有限公司 | Ultrasonic-assisted membrane distillation water treatment system and method |
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| CN101327407A (en) * | 2007-06-20 | 2008-12-24 | 天津工业大学 | Apparatus and method for evaporating and concentrating liquid |
| CN101664642A (en) * | 2008-09-04 | 2010-03-10 | 天津工业大学 | Device and method for air-blowing vacuum membrane distillation |
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