CN110668631A - High-concentration oily wastewater demulsification system and method based on tubular membrane - Google Patents
High-concentration oily wastewater demulsification system and method based on tubular membrane Download PDFInfo
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Abstract
The invention discloses a high-concentration oily wastewater demulsification system and method based on a tubular membrane. Aiming at the problems that the high-concentration oily wastewater has wide sources and the content of emulsified oil in the system is high, the treatment difficulty is high, the electrostatic spraying machine is used for dispersing the high-concentration oily wastewater into small-particle-size water-in-oil charged fog drops, the fog drops are fully and uniformly mixed with oxidizing gas containing ozone in a gas-liquid mixer, the mass transfer efficiency of the ozone can be increased by charging the surfaces of the water-in-oil drops, the oxidative decomposition rate of the ozone on an oil film on the surface of the liquid is improved, and the pre-emulsification effect is achieved. Meanwhile, the PVDF base membrane material with the membrane cut-off molecular weight less than or equal to 30 ten thousand is selected, and the emulsion breaking agent has the advantages of long service cycle, easiness in cleaning, good emulsion breaking effect and the like. In addition, a magnetization resonance mechanism is further arranged at the front end opening of each filter membrane tube, and oil-water molecules are orderly integrated by utilizing the synergistic effect of a permanent magnetic field and ultrasonic waves, so that the oil-water separation efficiency is further improved. In a word, the method has the advantages of high efficiency, good universality and the like, and has potential application prospects.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a high-concentration oily wastewater demulsification system and method based on a tubular membrane.
Background
In recent years, rapid development of the grease industry brings great convenience to people's lives. However, the generation of various kinds of oily wastewater, especially high-concentration oily wastewater, is gradually becoming one of the important components of urban domestic wastewater in our country. If the wastewater is directly discharged into a municipal sewage plant, oil-containing substances in the wastewater are easily wrapped on the outer layer of the filler, so that the mass transfer of oxygen is hindered, aerobic microorganisms are easily metabolized and flocculated, and the normal operation of the sewage plant is influenced. If the wastewater is directly discharged into a natural water body, the oily substances float on the surface of the water body, so that the reoxygenation and natural purification effects of the water body can be influenced, the original ecological balance is broken, and the ecological environment of the water body is damaged. Therefore, the development of the treatment work of the high-concentration oily wastewater has far-reaching significance for reducing the operation pressure of the municipal sewage treatment plant and protecting the ecological environment of the water body.
In a complex system of high-concentration oily wastewater, the interface film formed on the surface of emulsified oil consisting of fine oil droplets is charged, so that an electric double layer is easily formed on the outer layer of the oil droplets, the oil droplets are extremely difficult to mutually repel, and the difficulty in oil-water separation is greatly increased. This also makes the removal of emulsified oil a difficult and important point in the treatment process of oily wastewater. If the separation of emulsified oil and water is to be realized, emulsion breaking is firstly needed, namely, the interface of oil droplets is destroyed, so that the oil droplets approach each other and are gathered into large oil droplets, and the oil droplets float on the water surface. The traditional emulsion breaking method, such as chemical emulsion breaking, utilizes the emulsion molecules to permeate and adhere to the interface of emulsion droplets to destroy the surface film and release the dispersed phase, thereby achieving the purpose of emulsion breaking. However, the chemical demulsification method has poor universality, different demulsifiers are required to be adopted in different systems, and the addition amount of the demulsifier is increased when the method is applied to treat high-concentration oily wastewater, so that the treatment cost is increased. In addition, the method also needs to introduce the demulsifier into the water body, so that the risk of secondary pollution exists. These disadvantages limit the scope of application of chemical emulsion breaking to some extent. The membrane separation method is a novel method for realizing demulsification by utilizing affinity performance of membrane materials. Among a plurality of membrane materials, the tubular membrane has great advantages in the treatment process of the oily wastewater due to the advantages of small pressure loss of the components, high demulsification efficiency, strong anti-fouling performance, easy cleaning and the like, and is gradually paid attention to. Chinese patent CN205387508U discloses an oil-containing wastewater tubular membrane treatment device, which has the advantages of convenient separation of oil-water mixture, easy collection of filtered oil, long service life of used filter medium, no need of frequent replacement, etc. However, when the equipment is used for treating high-concentration oily wastewater, the membrane load is easily overlarge, so that the treatment efficiency is reduced, the membrane is damaged and the like, and the operation cost is undoubtedly increased. Therefore, aiming at the characteristics of high-concentration oily wastewater and combining the structural characteristics of the tubular membrane, the novel demulsification system and method based on the tubular membrane are provided, and have important significance for improving the treatment level of the high-concentration oily wastewater.
Disclosure of Invention
The invention provides a novel, universal and efficient demulsification system and method for high-concentration oily wastewater, which aim at the problems that the high-concentration oily wastewater is wide in source and the content of emulsified oil in the system is high and the processing difficulty is high, and by utilizing the structural characteristics of a tubular membrane and combining ozone oxidative decomposition, a permanent magnetic field and an ultrasonic wave synergistic technology. The technical scheme of the invention is as follows: a tubular membrane-based demulsification system for high-concentration oily wastewater, comprising: a raw water tank for containing high-concentration oily wastewater,
a filter connected to the raw water tank for removing solid particle impurities in the high-concentration oily wastewater,
an electrostatic sprayer connected to the filter for dispersing the filtered high-concentration oily wastewater into small-particle-size charged droplets,
a pre-demulsification device connected to the electrostatic sprayer and used for fully mixing the charged fog drops with the oxidizing gas for demulsification pre-treatment,
the tubular ultrafiltration membrane component connected to the pre-demulsification device comprises a plurality of filter membrane pipes with ultrafiltration membrane cores, elbow connecting pipes connected with the head end and the tail end of the two connected filter membrane pipes, and a magnetization resonance mechanism arranged at the water inlet of each filter membrane pipe and used for orderly integrating oil molecules and water molecules to realize oil-water separation,
a water producing tank for collecting clean water connected to the water producing port of each membrane tube, or a washing tank for washing the membrane tubes, and
and the circulating water tank is connected to a drain port of the last-stage filter membrane pipe and is used for intensively pumping the concentrated water to the filter and circulating in the whole demulsification system, and the concentrated water is transported outside after the concentrated water in the circulating water tank reaches a certain oil content.
Furthermore, the ultrafiltration membrane core is made of PVDF (polyvinylidene fluoride), the membrane cut-off molecular weight is less than or equal to 30 ten thousand, the pH application range is 4-10, and the ultrafiltration membrane core has the advantages of wide pH application range, good universality, long service cycle, easiness in cleaning, good demulsification effect, no secondary pollution and the like.
Furthermore, water pumps are arranged between the raw water tank and the filter, between the filter and the electrostatic sprayer, between the pre-demulsification device and the magnetic resonance mechanism arranged at the front end of the first section of filter membrane pipe, between the water producing port of each filter membrane pipe and the water producing tank, between the sewage discharging port of the last section of filter membrane pipe and the circulating water tank, between the circulating water tank and the filter, and between the water producing port of each filter membrane pipe and the cleaning water tank.
Further, the filter comprises a filter column and a filter pressing column, a first filtering water inlet connected with the raw water tank is formed in the bottom of the filter column, and a coarse grid net, a fine grid net and a PP (polypropylene) gauze screen are sequentially arranged in the filter column from bottom to top and used for filtering large-particle impurities in the wastewater; the top of filtering the post is equipped with the overflow mouth, and the overflow mouth links to each other with the setting at the filtration water import two of filter-pressing post lateral wall through communicating pipe, and the top of filter-pressing post is equipped with electric hydraulic cylinder, and electric hydraulic cylinder's push rod lower extreme is equipped with the piston, and there is nylon wire filter disc bottom of filter-pressing post through flange joint, and nylon wire filter disc below is equipped with the water storage chamber that has the drainage export. Because the aperture of the nylon wire mesh in the nylon wire mesh filter disc is relatively small, and the filtering time is long by the dead weight of the wastewater, tiny solid impurities in the wastewater are removed in a filter pressing mode, and the blockage of the spray head caused by the fact that the wastewater enters the electrostatic spraying machine can be effectively prevented.
Further, the electrostatic sprayer comprises a water storage tank and a control box connected to the bottom of the water storage tank, an electrode net is arranged at the bottom of the water storage tank, a liquid outlet funnel with a filter screen is arranged at the bottom of the water storage tank surrounded in the electrode net, the bottom of the liquid outlet funnel is connected with an atomizing pipe with an atomizing head at the tail end, a high-voltage electrostatic generator electrically connected with the electrode net, a diaphragm pump arranged on the atomizing pipe and a storage battery used for supplying power are arranged in the control box. The electrostatic sprayer can break the oily wastewater into water-in-oil fog drops with charged surfaces with small particle diameters, can increase the contact rate with the oxidizing gas, and improves the mass transfer efficiency of the oxidizing gas.
Furthermore, the pre-demulsification device comprises a gas-liquid mixer, the liquid inlet end of the gas-liquid mixer is connected with the atomizing spray head, and the gas inlet end of the gas-liquid mixer is used for introducing oxidizing gas to be in full contact with the electrified mist water-in-oil droplets, so that the pre-demulsification effect is improved. The spiral flow gathering pipe is connected below the outlet end of the gas-liquid mixer and used for gathering the mixed gas and liquid into liquid which flows into the water gathering tank below the spiral flow gathering pipe.
Further, the oxidizing gas is composed of ozone and air, wherein the content of ozone is 0.1-10%. Ozone content below 0.1% can affect the pre-demulsification effect, while a proportion above 10% can cause ozone waste and even escape of polluted air.
Further, the magnetization resonance mechanism includes the magnetization water tank, sets up a pair of permanent magnet at the magnetization water tank inside wall along the rivers direction to and set up the ultrasonic vibrator at the magnetization water tank lateral wall, the permanent magnet can carry out the ordering with random profit molecule, combines ultrasonic vibration to realize the water oil separating trend.
Furthermore, an infrared sewage oil content detector is arranged in the circulating water tank and used for detecting the oil content in the circulating water tank.
The invention also provides a method for treating high-concentration oily wastewater by using the system, which comprises the following steps:
s1: pumping high-concentration oily wastewater stored in a raw water tank into a filter by a water pump, filtering by a filter column to remove large-particle solid impurities, and filtering by a filter pressing column to remove micro-particle solid impurities;
s2: the high-concentration oily wastewater with impurities filtered out is pumped to an electrostatic sprayer by a water pump, the high-concentration oily wastewater is treated into small-particle-size water-in-oil charged droplets, and then is sprayed into a gas-liquid mixer of a pre-demulsification device by a spray head to carry out mixed flow hedging with mixed oxidizing gas which is oppositely sprayed and has the ozone content of 0.1-10%, the mass transfer efficiency of ozone is increased by utilizing the charged property of the surface of the small-particle-size water-in-oil droplets, organic pollutants are oxidized and broken to achieve a demulsification pretreatment effect, and demulsification pretreatment products are condensed and converged by a spiral flow-converging pipe and then are stored in a water-converging tank;
s3: the pre-demulsification wastewater in the water collection tank is pumped to the tubular ultrafiltration membrane component through a water pump, the pre-demulsification wastewater enters each section of filter membrane pipe for demulsification and filtration, the pre-demulsification wastewater sequentially integrates oil and water molecules under the synergistic action of a permanent magnetic field and ultrasonic waves to realize oil-water separation, clear water produced at a water production port of the filter membrane pipe of each section of filter membrane pipe is pumped to the water production tank through the water pump, and concentrated water is pumped to the circulating water tank through a drain port of the filter membrane pipe at the last section of filter membrane pipe;
s4: detecting whether the oil content is more than 15% by an infrared sewage oil content detector in the circulating water tank, if the batch treatment is finished, discharging concentrated water in the circulating water tank, and feeding next batch of wastewater in the raw water tank into a system; if not, pumping the concentrated water into the filter through a water pump to circulate in the whole demulsification system until the oil content is detected to be more than 15%, discharging the concentrated water outwards after the batch is finished, and feeding the next batch of wastewater in the original water tank into the system;
s5: and after the pressure difference of inlet and outlet water of the system rises by 1.5bar, cleaning water in the cleaning water tank is introduced from the water inlet of each filter membrane pipe by using a water pump, and the cleaning water is discharged from the drain outlet of the last filter membrane pipe to perform back flushing on the filter membrane pipes.
The invention has the beneficial effects that:
(1) according to the invention, the oil-containing wastewater is dispersed into water-in-oil fog drops with small particle size and charged surfaces through the electrostatic sprayer, and then the water-in-oil fog drops are fully and uniformly mixed with air containing ozone in the gas-liquid mixer, so that the mass transfer efficiency of the ozone can be increased due to the charged surfaces of the water-in-oil fog drops, the oxidative decomposition rate of the ozone on an oil film on the surface of the liquid is improved, and the pre-emulsification effect is achieved;
(2) the front end of each filter membrane tube is provided with the magnetization resonance mechanism, and oil and water molecules are orderly integrated by utilizing the synergistic effect of the permanent magnetic field and the ultrasonic wave, so that the water molecules can rapidly penetrate through the hydrophilic filter membrane material, and the demulsification efficiency is improved;
(3) aiming at the characteristics of high-concentration oily wastewater, the PVDF base membrane material with the membrane molecular weight cutoff of less than or equal to 30 ten thousand is selected as the ultrafiltration membrane core, and the demulsification agent has the advantages of good demulsification effect, wide pH application range, good universality, long service cycle, easiness in cleaning, no secondary pollution and the like.
Drawings
FIG. 1 is a system block diagram of the present invention;
fig. 2 is a schematic view of the internal structure of the electrostatic sprayer of the invention.
Wherein, 1-raw water tank, 2-filter, 21-filter column, 22-filter column, 23-filter water inlet I, 24-coarse grid net, 25-fine grid net, 26-PP gauze net, 27-overflow port, 28-communicating pipe, 29-filter water inlet II, 210-electric hydraulic cylinder, 211-piston, 212-nylon wire screen filter disc, 213-filter water outlet, 214-water storage cavity, 3-electrostatic sprayer, 31-water storage tank, 32-control box, 33-electrode net, 34-liquid outlet funnel, 35-spray head, 36-spray pipe, 37-high voltage electrostatic generator, 38-diaphragm pump, 39-accumulator, 4-emulsion breaking device, 41-gas-liquid mixer, 42-spiral flow gathering pipe, 43-water collecting tank, 5-tubular ultrafiltration membrane component, 51-filtration membrane tube, 52-elbow connection tube, 53-filtration membrane tube water inlet, 54-magnetization resonance mechanism, 541-magnetization water tank, 542-permanent magnet, 543-ultrasonic vibrator, 55-filtration membrane tube water production port, 56-end filtration membrane tube sewage discharge port, 6-water production tank, 7-cleaning water tank, 8-circulation water tank, 81-infrared sewage oil content detector, 9, 10, 11, 12, 13, 14 and 15-water pump.
Detailed Description
Example 1
The high-efficiency demulsification system for high-concentration oily wastewater based on the tubular membrane is shown in figure 1 and comprises a raw water tank 1 for containing the high-concentration oily wastewater,
a filter 2 connected to the raw water tank 1, and a water pump 9 arranged between the raw water tank 1 and the filter 2. The filter 2 comprises a filter column 21 and a filter-pressing column 22, the bottom of the filter column 21 is provided with a first filter water inlet 23 connected with the raw water tank 1, and a coarse grid net 24, a fine grid net 25 and a PP gauze net 26 are sequentially arranged in the filter column 21 from bottom to top and used for filtering large-particle impurities in the wastewater; the top of the filter column 21 is provided with an overflow port 27, the overflow port 27 is connected with a second filtered water inlet 29 arranged on the side wall of the filter pressing column 22 through a communicating pipe 28, the top of the filter pressing column 22 is provided with an electric hydraulic cylinder 210, the lower end of a push rod of the electric hydraulic cylinder 210 is provided with a piston 211, the bottom of the filter pressing column 22 is connected with a nylon wire mesh filter disc 212 through a flange, and a water storage cavity 214 with a filtered water outlet 213 is arranged below the nylon wire mesh filter disc 212. Because the aperture of the nylon wire mesh in the nylon wire mesh filter disc 212 is relatively small, and the filtering time is long by the dead weight of the wastewater, tiny solid impurities in the wastewater are removed in a filter pressing mode, and the blockage of the spray head 35 caused by the fact that the wastewater enters the electrostatic sprayer 3 can be effectively prevented.
An electrostatic sprayer 3 connected to the filter 2, and a water pump 10 is arranged between the filter 2 and the electrostatic sprayer 3. The electrostatic sprayer 3 comprises a water storage tank 31, a control box 32 connected to the bottom of the water storage tank 31, an electrode net 33 arranged at the bottom of the water storage tank 31, a liquid outlet funnel 34 with a filter screen arranged at the bottom of the water storage tank 31 enclosed in the electrode net 33, a spraying pipe 36 with a spraying head 35 at the tail end connected to the bottom of the liquid outlet funnel 34, a high-voltage electrostatic generator 37 electrically connected with the electrode net 33, a diaphragm pump 38 arranged on the spraying pipe 36 and a storage battery 39 used for supplying power. The electrostatic sprayer 3 can disperse the oily wastewater into small-particle-size charged droplets, so that the contact rate with the oxidizing gas can be increased, and the mass transfer efficiency of the oxidizing gas can be improved.
The pre-demulsification device 4 is connected to the electrostatic sprayer 3, the pre-demulsification device 4 comprises a gas-liquid mixer 41, the liquid inlet end of the gas-liquid mixer 41 is connected with the spray head 35, the gas inlet end of the gas-liquid mixer 41 is used for introducing oxidizing gas (the oxidizing gas consists of ozone and air, wherein the content of the ozone is 1%), and then the oxidizing gas is in full contact with the charged atomized water-in-oil droplets, so that the pre-demulsification effect is improved. A spiral flow gathering pipe 42 is connected below the outlet end of the gas-liquid mixer 41, and is used for gathering the mixed gas and liquid into liquid which flows into a water gathering tank 43 below the spiral flow gathering pipe 42, and is used for fully mixing the charged fog drops and the oxidizing gas for demulsification pretreatment.
The tubular ultrafiltration membrane component 5 connected to the pre-demulsification device 4 comprises a plurality of filter membrane tubes 51 containing ultrafiltration membrane cores, elbow connecting tubes 52 connected to the head end and the tail end of the two connected filter membrane tubes 51, and a magnetization resonance mechanism 54 arranged at a water inlet 53 of each filter membrane tube, wherein a water pump 11 is arranged between the magnetization resonance mechanism 54 arranged at the front end of the first filter membrane tube 51 and the pre-demulsification device 4. The magnetic resonance mechanism 54 includes a magnetic water tank 541, a pair of permanent magnets 542 disposed on an inner wall of the magnetic water tank 541 along a water flow direction, and an ultrasonic vibrator 543 disposed on an outer wall of the magnetic water tank 541, wherein the permanent magnets 542 can order irregular oil-water molecules, and combine ultrasonic vibration to realize an oil-water separation tendency.
The water producing port 55 connected to each filter membrane pipe is connected with a water producing tank 6 for collecting clean water through a water pump 12, or is connected with a cleaning water tank 7 for cleaning the filter membrane pipe through a water pump 15, and is connected with a circulating water tank 8 of a tail-end filter membrane pipe drainage port 56 through a water pump 13, and the circulating water tank is used for concentrating concentrated water, pumping the concentrated water to the filter 2 through a water pump 14 and circulating the concentrated water in the whole emulsion breaking system, and transporting the concentrated water outwards after the concentrated water in the circulating water tank 8 reaches a certain oil content. An infrared sewage oil content detector 81 is installed in the circulating water tank 8 and used for detecting the oil content in the circulating water tank 8.
The invention also provides a method for treating high-concentration oily wastewater by using the system, which comprises the following steps:
s1: pumping high-concentration oily wastewater stored in a raw water tank 1 into a filter 2 through a water pump 9, filtering by a filter column 21 to remove large-particle solid impurities, and performing filter pressing by a filter pressing column 22 to remove micro-particle solid impurities;
s2: the high-concentration oily wastewater filtered of impurities is pumped to an electrostatic sprayer 3 through a water pump 10, the high-concentration oily wastewater is treated into charged small-particle-size water-in-oil fog drops, the charged small-particle-size water-in-oil fog drops are sprayed into a gas-liquid mixer 41 of a pre-demulsification device 4 through a spray head 35 to be mixed and flushed with mixed oxidizing gas with the ozone content of 1% sprayed oppositely, the mass transfer efficiency of ozone is increased by utilizing the charged performance of the surface of the small-particle-size water-in-oil fog drops, organic pollutants are oxidized and broken to achieve a demulsification pretreatment effect, and demulsification pretreatment products are condensed and converged through a spiral flow-gathering pipe 42 and then stored in a water-gathering;
s3: the pre-demulsification wastewater in the water collecting tank 43 is pumped to the tubular ultrafiltration membrane component 5 through the water pump 11, the pre-demulsification wastewater firstly passes through the magnetization resonance mechanism 54 arranged at the front end when entering each section of the filter membrane pipe 51 for demulsification and filtration, oil and water molecules are orderly integrated under the synergistic action of the permanent magnetic field and the ultrasonic wave, so that oil and water separation is realized, clear water produced by a filter membrane pipe water producing port 55 of each section of the filter membrane pipe 51 is pumped to the water producing tank 6 through the water pump 12, and concentrated water is pumped to the circulating water tank 8 through the water pump 13 by the tail section of the filter membrane pipe sewage discharging port 56;
s4: detecting whether the oil content is more than 15% by an infrared sewage oil content detector 81 in the circulating water tank 8, if the batch processing is finished, discharging the concentrated water in the circulating water tank 8, and feeding the next batch of wastewater in the original water tank 1 into the system; if not, pumping the concentrated water into the filter 2 through the water pump 14, circulating in the whole demulsification system until the oil content is detected to be more than 15%, discharging the concentrated water outwards after the batch is finished, and feeding the next batch of wastewater in the original water tank 1 into the system;
s5: after the pressure difference of inlet water and outlet water of the system rises to 1.5bar, cleaning water in the cleaning water tank 7 is introduced from the water inlet 53 of each filter membrane pipe by using the water pump 15, the cleaning water is discharged from the drain outlet 56 of the last filter membrane pipe, and the filter membrane pipe 51 is backwashed.
Examples of the experiments
Comparative example 1: the electrostatic atomizer was changed to the ordinary atomizer, and the rest of the conditions were the same as in example 1.
Comparative example 2: the ozone-containing air was replaced with pure air, and the remaining conditions were the same as in example 1.
Comparative example 3: the magnetization resonance mechanism was removed, and the remaining conditions were the same as in example 1.
At 1m3Per h treatment engineering case for oily wastewater of emulsion: the oil content of inlet water is 30000ppm, COD is 80000ppm, the following four schemes are adopted for treatment, and the effects are compared as follows:
as can be seen from the above table, the overall effect shows the trend of example 1> comparative example 3> comparative example 1> comparative example 2, wherein in the comparative example 1, the electrostatic spraying machine in the example 1 is replaced by a common spraying machine, so that the electrostatic quantity of droplets is reduced, the mass transfer efficiency of ozone is reduced, the pre-demulsification effect is poor, the number of single-batch circulation times is large, and the effluent quality is also influenced to a certain extent; comparative example 2 is that the oxidation ability of the oxidizing gas is reduced by replacing the ozone-containing air in example 1 with pure air, so that the pre-demulsification effect is poor, and the water quality of the effluent is poor; comparative example 3 is that the magnetization resonance mechanism in example 1 is removed, so that the oil-water molecules are not subjected to primary separation before passing through the membrane, the number of single-batch circulation is increased, and the quality of effluent water is correspondingly deteriorated.
Claims (10)
1. A high concentration oil-containing wastewater demulsification system based on a tubular membrane is characterized by comprising:
a raw water tank (1) for containing high-concentration oily wastewater,
a filter (2) connected to the raw water tank (1) for removing solid particle impurities from the high-concentration oily wastewater,
an electrostatic sprayer (3) connected to the filter (2) for dispersing the filtered high-concentration oily wastewater into small-particle-size charged droplets,
a pre-demulsification device (4) connected to the electrostatic sprayer (3) and used for fully mixing the charged fog drops with the oxidizing gas for demulsification pre-treatment,
the tubular ultrafiltration membrane component (5) connected to the pre-demulsification device (4) comprises a plurality of filter membrane tubes (51) with ultrafiltration membrane cores, elbow connecting tubes (52) connected to the head end and the tail end of the two connected filter membrane tubes (51), and a magnetization resonance mechanism (54) arranged at a water inlet (53) of each filter membrane tube, and is used for orderly integrating oil-water molecules to realize oil-water separation,
a water production tank (6) connected to each membrane tube water production port (55) for collecting clean water, or a cleaning water tank (7) for cleaning the membrane tubes, and
and the circulating water tank (8) is connected to a drain outlet (56) of the last section of the filter membrane pipe and is used for intensively pumping the concentrated water to the filter (2) and circulating in the whole demulsification system, and when the concentrated water in the circulating water tank (8) reaches a certain oil content, the concentrated water is transported outwards.
2. The demulsification system for high-concentration oily wastewater based on a tubular membrane as claimed in claim 1, wherein the ultrafiltration membrane core is made of PVDF, the membrane cut-off molecular weight is less than or equal to 30 ten thousand, and the pH application range is 4-10.
3. The demulsification system for high-concentration oily wastewater based on a tubular membrane as claimed in claim 1, wherein water pumps (9, 10, 11, 12, 13, 14, 15) are arranged between the raw water tank (1) and the filter (2), between the filter (2) and the electrostatic sprayer (3), between the pre-demulsification device (4) and the magnetization resonance mechanism (54) arranged at the front end of the first section of the membrane filtering pipe (51), between the water producing port (55) of each membrane filtering pipe and the water producing tank (6), between the drain port (56) of the last section of the membrane filtering pipe and the circulating water tank (8), between the circulating water tank (8) and the filter (2), and between the water producing port (55) of each membrane filtering pipe and the cleaning water tank (7).
4. The high-concentration oily wastewater demulsification system based on the tubular membrane as claimed in claim 1, wherein the filter (2) comprises a filter column (21) and a filter-press column (22), the bottom of the filter column (21) is provided with a first filtering water inlet (23) connected with the raw water tank (1), the interior of the filter column (21) is sequentially provided with a coarse grid mesh (24), a fine grid mesh (25) and a PP (polypropylene) gauze mesh (26) from bottom to top, the top of the filter column (21) is provided with an overflow port (27), the overflow port (27) is connected with a second filtering water inlet (29) arranged on the side wall of the filter-press column (22) through a communicating pipe (28), the top of the filter-press column (22) is provided with an electric hydraulic cylinder (210), the lower end of a push rod of the electric hydraulic cylinder (210) is provided with a piston (211), the bottom of the filter-press column (22) is connected with a nylon wire mesh filter disc (212), a water storage cavity (214) with a filtered water outlet (213) is arranged below the nylon wire mesh filter disc (212).
5. The demulsification system for high-concentration oily wastewater based on a tubular membrane as claimed in claim 1, wherein the electrostatic sprayer (3) comprises a water storage tank (31), a control box (32) connected to the bottom of the water storage tank (31), an electrode net (33) is arranged at the bottom of the water storage tank (31), a liquid outlet funnel (34) with a filter screen is arranged at the bottom of the water storage tank (31) enclosed in the electrode net (33), a spray pipe (36) with a spray head (35) at the tail end is connected to the bottom of the liquid outlet funnel (34), a high-voltage electrostatic generator (37) electrically connected with the electrode net (33), a diaphragm pump (38) arranged on the spray pipe (36) and a storage battery (39) for supplying power are arranged in the control box (32).
6. The pipe membrane-based demulsification system for high-concentration oily wastewater as claimed in claim 1, wherein the pre-demulsification device (4) comprises a gas-liquid mixer (41), the liquid inlet end of the gas-liquid mixer (41) is connected with the atomizing spray head (35), the gas inlet end of the gas-liquid mixer (41) is used for introducing oxidizing gas, a spiral flow gathering pipe (42) is connected below the outlet end of the gas-liquid mixer (41), and a water gathering tank (43) is connected below the spiral flow gathering pipe (42).
7. The demulsification system for high-concentration oily wastewater based on a tubular membrane as claimed in claim 1, wherein the oxidizing gas consists of ozone and air, and the content of ozone is 0.1-10%.
8. The demulsification system for high-concentration oily wastewater based on a tubular membrane as claimed in claim 1, wherein the magnetization resonance mechanism (54) comprises a magnetization water tank (541), a pair of permanent magnets (542) arranged on the inner side wall of the magnetization water tank (541) along the water flow direction, and an ultrasonic vibrator (543) arranged on the outer side wall of the magnetization water tank (541).
9. The demulsification system for high-concentration oily wastewater based on a tubular membrane as claimed in claim 1, wherein an infrared wastewater oil content detector (81) is installed in the circulating water tank (8).
10. A method for treating high-concentration oily wastewater by using the system as claimed in any one of claims 1 to 9, characterized by comprising the steps of:
s1: pumping the high-concentration oily wastewater stored in the raw water tank (1) into the filter (2) through a water pump (9), filtering by the filter column (21) to remove large-particle solid impurities, and then performing pressure filtration by the pressure filtration column (22) to remove fine-particle solid impurities;
s2: the high-concentration oily wastewater filtered with impurities is pumped to the electrostatic sprayer (3) through a water pump (10), the high-concentration oily wastewater is treated into small-particle-size water-in-oil charged fog drops, the fog drops are sprayed into a gas-liquid mixer (41) of a pre-demulsification device (4) through the spray head (35) to be mixed and flushed with mixed oxidizing gas with the ozone content of 0.1-10% which is oppositely sprayed, the mass transfer efficiency of ozone is increased by utilizing the charged performance of the surface of the small-particle-size water-in-oil fog drops, organic pollutants are oxidized and broken to achieve a demulsification pretreatment effect, and demulsification pretreatment products are condensed and converged through the spiral flow-gathering pipe (42) and then stored in the water-gathering tank (43);
s3: pre-demulsification wastewater in a water collecting tank (43) is pumped to a tubular ultrafiltration membrane component (5) through a water pump (11), the pre-demulsification wastewater enters each section of filter membrane pipe (51) for demulsification and filtration, passes through a magnetic resonance mechanism (54) arranged at the front end, oil and water molecules are orderly integrated under the synergistic action of a permanent magnetic field and ultrasonic waves, oil and water separation is realized, clear water produced by a filter membrane pipe water producing port (55) of each section of filter membrane pipe (51) is pumped to a water producing tank (6) through a water pump (12), and concentrated water is pumped to a circulating water tank (8) through a water pump (13) by a tail section of filter membrane pipe drain port (56);
s4: detecting whether the oil content is more than 15% by an infrared sewage oil content detector (81) in the circulating water tank (8), if the batch processing is finished, discharging concentrated water in the circulating water tank (8) outwards, and feeding next batch of wastewater in the original water tank (1) into the system; if not, pumping the concentrated water into the filter (2) through the water pump (14) to circulate in the whole demulsification system until the oil content is detected to be more than 15%, discharging the concentrated water out after the batch is finished, and feeding the next batch of wastewater in the raw water tank (1) into the system;
s5: and after the pressure difference of inlet water and outlet water of the system rises to 1.5bar, cleaning water in the cleaning water tank (7) is introduced from a water inlet (53) of each filter membrane pipe by using a water pump (15), the cleaning water is discharged from a drain outlet (56) of the last filter membrane pipe, and the filter membrane pipes (51) are backwashed.
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Application publication date: 20200110 |