Process for treating high-salinity wastewater based on membrane filtration and ionization oxidation

Abstract

The invention discloses a process for treating high-salinity wastewater based on membrane filtration and ionization oxidation, and belongs to the technical field of wastewater treatment.The process comprises the steps that S1, large-particle suspended solids and insoluble suspended solids in the high-salinity wastewater are sequentially intercepted through a filter screen and a solid-liquid separation channel; s2, oxidizing organic matters in the high-salinity wastewater through ionization oxidation, settling inorganic suspended matters generated by ionization oxidation through a flocculating agent, and then intercepting precipitates through an ionization channel; s3, inorganic salt is separated out through evaporative crystallization; s4, inorganic salt crystals and the high-salinity wastewater are separated through an ultrafiltration membrane filter, and the separated high-salinity wastewater is subjected to evaporative crystallization again. The high-salinity wastewater is subjected to repeated evaporative crystallization, so that the recovery efficiency of inorganic salt in the high-salinity wastewater is improved, meanwhile, the wastewater is purified and recovered, water resources can be effectively saved, and environmental pollution is reduced. The economic benefit of high-salinity wastewater treatment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a process for treating high-salt wastewater based on membrane filtration and ionization oxidation. Background Art

[0002] High-salinity wastewater refers to wastewater with a total salt content of at least 3.5wt%, which mainly comes from industrial production processes such as chemical plants, oil and gas collection and processing. This type of wastewater contains a variety of substances, including salt, oil, organic heavy metals and radioactive substances. Due to its high salt content, it poses a serious threat to the environment and ecology. Therefore, the treatment of high-salinity wastewater has become an important issue in environmental protection and sustainable resource utilization.

[0003] The main salt substances in high-salinity wastewater include Cl - 、SO4 2- 、Na + , Ca 2+ Although these ions are beneficial to the growth of microorganisms at a certain concentration, they will inhibit and toxicize the microorganisms when the concentration is too high, affecting their treatment efficiency. In addition, there are many types of organic matter in high-salinity wastewater, which is difficult to biochemically treat, and traditional biological treatment methods are often ineffective.

[0004] Existing high-salt wastewater treatment processes mostly use evaporation crystallization and membrane filtration technology to precipitate inorganic salts and then perform solid-liquid separation. However, the organic matter content in the wastewater is high and difficult to treat, and the precipitated inorganic salts are contaminated, and the economic value of recovering the inorganic salts decreases. The existing treatment of high-salt wastewater often requires rotation and retention in multiple equipment, and the high-salt wastewater cannot be continuously treated, resulting in low treatment efficiency of high-salt wastewater. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a process for treating high-salinity wastewater based on membrane filtration and ionization oxidation.

[0006] The technical solution of the present invention is: a process for treating high-salinity wastewater based on membrane filtration and ionization oxidation, comprising the following steps:

[0007] S1. Preprocessing:

[0008] The high-salt wastewater is passed into a pretreatment device and filtered through a filter screen, wherein the mesh number of the filter screen is 10-14 meshes, and then the filtered high-salt wastewater is passed through a solid-liquid separation channel in the pretreatment device to remove suspended particles in the high-salt wastewater, wherein the flow rate of the wastewater in the solid-liquid separation channel is 4.5-6L / min, to obtain pretreated high-salt wastewater;

[0009] S2, ionization oxidation:

[0010] The pretreated high-salt wastewater is passed from the pretreatment equipment into multiple ionization precipitation equipment for ionization oxidation treatment, and a flocculant is added in the ionization channel 21, and the amount of the flocculant added is 50 mg / L. Then, the precipitate and the wastewater are separated into solid and liquid through the ionization channel in the ionization precipitation equipment. The width of the ionization channel is 5-10 cm, the anode in the ionization channel is a carbon plate, the cathode is a stainless steel plate, the ionization voltage is 5 V, and the current density is 50-80 A / m 2 , the flow rate of the pretreated high-salinity wastewater in the ionization channel is 4.5-6L / min to obtain oxidized wastewater;

[0011] S3, evaporation crystallization:

[0012] The oxidized wastewater is passed into the evaporation channels in multiple evaporation and crystallization equipment for evaporation, the evaporation temperature is 50-60°C, the evaporation time is 20-30min, the flow rate of the evaporation channel is 4.5-6L / min, after the water molecules in the wastewater evaporate, the inorganic salts are precipitated to form crystals and form crystalline salt wastewater with the remaining wastewater;

[0013] S4, membrane filtration:

[0014] The crystallized salt wastewater is passed through an ultrafiltration membrane filter for filtration. After the filtration is completed, the inorganic salt crystals are recovered. The average pore size of the ultrafiltration membrane is 5-10nm. The high-salt wastewater filtered through the ultrafiltration membrane filter is evaporated twice in an evaporation crystallization device.

[0015] Furthermore, the equipment used in the process for treating high-salt wastewater based on membrane filtration and ionization oxidation includes pretreatment equipment, ionization precipitation equipment, evaporation crystallization equipment, and ultrafiltration membrane filter. The pretreatment equipment includes a filter tank, a filter screen is fixedly connected to the filter tank, a plurality of solid-liquid separation channels are fixedly connected to the right side of the filter tank, a plurality of sedimentation tanks are fixedly connected below the solid-liquid separation channels, a valve is fixedly connected to the bottom of the sedimentation tank, and the right ends of the plurality of solid-liquid separation channels are connected to a temporary storage tank.

[0016] Description: The large suspended solids in the high-salt wastewater are filtered through the filter net, and then the insoluble suspended solids in the high-salt wastewater are intercepted through the sedimentation tank.

[0017] Furthermore, the ionization precipitation equipment includes an ionization channel, the front inner wall and the rear inner wall of the ionization channel are fixedly connected with an anode plate and a cathode plate respectively, a flocculant feeder is fixedly connected to the upper left end of the ionization channel, a plurality of sedimentation tanks 2 are fixedly connected to the bottom of the ionization channel, a valve 2 is fixedly connected to the bottom of the sedimentation tank 2, the right side of the ionization channel is fixedly connected to a temporary storage tank 2, the interior of the temporary storage tank 2 is fixedly connected with a liquid pump, and the water outlet of the liquid pump is fixedly connected to a water pump pipe for connecting to the evaporation crystallization equipment.

[0018] Description: The organic matter in the high-salt wastewater is ionized and oxidized through the ionization channel, and the insoluble inorganic precipitates produced by the ionization oxidation are intercepted by the second sedimentation tank.

[0019] Furthermore, the flocculant feeder comprises a silo, the interior of the silo is rotatably connected to a spiral feed rod, and the top of the silo is fixedly connected to a feed motor for driving the spiral feed rod to rotate.

[0020] Note: The flocculant is automatically added through the feeding motor, and the feeding speed can be changed by adjusting the speed of the feeding motor.

[0021] Furthermore, a battery panel 1 for supplying power to the anode plate and the cathode plate and a solar power generation panel 1 for charging the battery panel 1 are fixedly connected to the top of the ionization channel.

[0022] Description: The solar panel provides electrical energy to the anode and cathode plates in a pair of ionization channels, forming an electric field between the anode and cathode plates, thereby causing the organic matter to undergo oxidation reaction at the anode and reduction reaction at the cathode.

[0023] Furthermore, the evaporation crystallization equipment includes an evaporation channel, the top of the evaporation channel is fixedly connected to a condensation channel, the inner bottom of the evaporation channel is fixedly connected to an electric heating plate, the top of the condensation channel is fixedly connected to a second battery panel for powering the electric heating plate and a second solar power generation panel for charging the second battery panel, the inside of the evaporation channel is fixedly connected to a condensate channel, the right side of the condensate channel is fixedly connected to a condensation tank, and the right side of the evaporation channel is fixedly connected to the ultrafiltration membrane filter.

[0024] Description: Use solar energy to provide electricity to heat wastewater, increase the evaporation of wastewater, reduce the electricity used for wastewater treatment, and reduce the cost of wastewater treatment.

[0025] Furthermore, the condensation channel includes a middle channel, the left side of the middle channel is fixedly connected to the pumping pipe, the front and rear sides of the middle channel are fixedly connected with a reflux channel, the right end of the reflux channel is connected to the middle channel, and the left end of the reflux channel discharges the waste water into the evaporation channel.

[0026] Description: The evaporated water encounters the condensation channel, transfers the heat to the wastewater in the condensation channel, and then condenses and falls into the condensate channel, which can enhance the condensation effect and recycle the heat of the evaporated water.

[0027] Furthermore, the ultrafiltration membrane filter includes a filtrate pool, a filter frame is fixedly connected to the filtrate pool, a plurality of branch pipes are fixedly connected to the filter frame, the left ends of the plurality of branch pipes are fixedly connected to a connecting pipe, the right ends of the plurality of branch pipes are fixedly connected to a main pipe, the main pipe is fixedly connected to a suction pump, the water outlet of the suction pump is fixedly connected to a reflux pipe, the reflux pipe is fixedly connected to the pumping pipe, and an ultrafiltration membrane assembly is fixedly connected below the branch pipe.

[0028] Description: The wastewater is filtered again through an ultrafiltration membrane filter, the precipitated inorganic salts are recovered, and the obtained high-salt wastewater is evaporated and crystallized again, which increases the salt recovery efficiency in the high-salt wastewater and improves the economic benefits of high-salt wastewater treatment.

[0029] Furthermore, the ultrafiltration membrane assembly comprises a connection cover, a plurality of ultrafiltration membrane tubes are fixedly connected to the lower end of the connection cover, and the upper part of the connection cover is threadedly connected to the branch pipe.

[0030] Note: The connection cover is convenient for replacing the ultrafiltration membrane tube and for maintenance.

[0031] Furthermore, the flocculant is composed of the following components in percentage by mass: 25.1-30.2% of polyferric sulfate, 15.4-23.5% of sodium polyacrylate, 13.6-18.7% of ferrous sulfate, 11.2-15.5% of powdered activated carbon, and the remainder of water-soluble starch.

[0032] Description: The above flocculants have good flocculation effect and can effectively remove suspended matter in oxidized wastewater and increase the cleanliness of salt after evaporation and crystallization.

[0033] The beneficial effects of the present invention are:

[0034] (1) The present invention filters suspended matter and large suspended matter contained in high-salt wastewater through pretreatment, then oxidizes organic matter in the high-salt wastewater through ionization oxidation technology, and then flocculates and precipitates suspended matter produced by ionization oxidation, and finally precipitates inorganic salts through evaporation and crystallization. The evaporated water is recycled and reused, and the inorganic salts and high-salt wastewater are separated by an ultrafiltration membrane filter. By repeatedly evaporating and crystallizing the high-salt wastewater, the recovery efficiency of the inorganic salt in the high-salt wastewater is increased. At the same time, the wastewater is purified and recycled, which can effectively save water resources and increase the economic benefits of high-salt wastewater treatment.

[0035] (2) The ionization oxidation equipment and the evaporation crystallization equipment in the present invention both use solar panels to provide electricity, which can effectively reduce the treatment cost of high-salt wastewater. The present invention can continuously treat high-salt wastewater through solid-liquid separation channels, ionization channels and evaporation crystallization channels, avoiding the time required for static sedimentation and the time required for static ionization, thereby improving the efficiency of high-salt wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the process of the present invention.

[0037] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0038] Figure 3 It is a front view of the pretreatment equipment of the present invention.

[0039] Figure 4 It is a front view of the ionization precipitation device of the present invention.

[0040] Figure 5 yes Figure 4 Cross-sectional view at AA in .

[0041] Figure 6 It is a front view of the evaporation crystallization equipment and the ultrafiltration membrane filter of the present invention.

[0042] Figure 7 It is a top view of the condensation channel of the present invention.

[0043] Figure 8 It is a cross-sectional view of the condensation channel of the present invention.

[0044] Fig. 9 It is a front view of the ultrafiltration membrane assembly of the present invention.

[0045] Among them, 1-pretreatment equipment, 2-ionization precipitation equipment, 3-evaporation crystallization equipment, 4-ultrafiltration membrane filter, 11-filtration tank, 12-filter screen, 13-solid-liquid separation channel, 14-precipitation tank one, 15-valve one, 16-temporary storage tank one, 21-ionization channel, 22-anode plate, 23-cathode plate, 24-feeder, 25-precipitation tank two, 26-valve two, 27-temporary storage tank two, 28-liquid pump, 29-water pump, 241-silo, 242-screw discharge rod, 243-discharge Motor, 211-solar panel 1, 212-solar power generation panel 1, 31-evaporation channel, 32-condensation channel, 33-electric heating plate, 34-solar panel 2, 35-solar power generation panel 2, 36-condensate channel, 37-condensation tank, 321-middle channel, 322-reflux channel, 41-filtrate tank, 42-filter frame, 43-branch pipe, 44-connecting pipe, 45-main pipe, 46-reflux pipe, 47-ultrafiltration membrane assembly, 48-liquid suction pump, 471-connecting cover, 472-ultrafiltration membrane tube. DETAILED DESCRIPTION

[0046] Embodiment 1:

[0047] The high-salinity wastewater in the present invention refers to wastewater with a salt content greater than 3.5wt%. The main salt substances in the high-salinity wastewater include Cl- 、SO4 2- 、Na + , Ca 2+ , mainly comes from wastewater generated in industrial production processes such as chemical plants, oil and natural gas collection and processing.

[0048] like Figure 1 As shown, a process for treating high-salinity wastewater based on membrane filtration and ionization oxidation comprises the following steps:

[0049] S1. Preprocessing:

[0050] The high-salt wastewater is passed into the pretreatment device 1 and filtered through the filter screen 12, the mesh number of the filter screen 12 is 10 meshes, and then the filtered high-salt wastewater is passed through the solid-liquid separation channel 13 in the pretreatment device 1 to remove suspended particles in the high-salt wastewater, and the flow rate of the wastewater in the solid-liquid separation channel 13 is 4.5L / min, to obtain pretreated high-salt wastewater;

[0051] S2, ionization oxidation:

[0052] The pretreated high-salt wastewater is passed from the pretreatment device 1 to multiple ionization precipitation devices 2 for ionization oxidation treatment. A flocculant is added in the ionization channel, and the amount of the flocculant added is 50 mg / L. Then, the precipitate and the wastewater are separated into solid and liquid through the ionization channel 21 in the ionization precipitation device 2. The width of the ionization channel 21 is 5 cm. The anode in the ionization channel 21 is a carbon plate, and the cathode is a stainless steel plate. The ionization voltage is 5 V and the current density is 50 A / m 2 , the flow rate of the pretreated high-salinity wastewater in the ionization channel 21 is 4.5 L / min, and oxidized wastewater is obtained;

[0053] The flocculant is composed of the following components in percentage by mass: 25.1% polyferric sulfate, 15.4% sodium polyacrylate, 13.6% ferrous sulfate, 11.2% powdered activated carbon, and the balance is water-soluble starch;

[0054] S3, evaporation crystallization:

[0055] The oxidized wastewater is passed into the evaporation channels 31 in the multiple evaporation and crystallization devices 3 for evaporation, the evaporation temperature is 50°C, the evaporation time is 20 minutes, the flow rate of the evaporation channel 31 is 4.5L / min, after the water molecules in the wastewater evaporate, the inorganic salts are precipitated to form crystals and form crystalline salt wastewater with the remaining wastewater;

[0056] S4, membrane filtration:

[0057] The crystallized salt wastewater is passed through the ultrafiltration membrane filter 4 for filtration. After the filtration is completed, the inorganic salt crystals are recovered. The average pore size of the ultrafiltration membrane is 5 nm. The high-salt wastewater filtered through the ultrafiltration membrane filter 4 is evaporated twice in the evaporation crystallization equipment 3.

[0058] Embodiment 2:

[0059] A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation comprises the following steps:

[0060] S1. Preprocessing:

[0061] The high-salt wastewater is passed into the pretreatment device 1 and filtered through the filter screen 12, the mesh number of the filter screen 12 is 12 meshes, and then the filtered high-salt wastewater is passed through the solid-liquid separation channel 13 in the pretreatment device 1 to remove suspended particles in the high-salt wastewater, the flow rate of the wastewater in the solid-liquid separation channel 13 is 5L / min, and the pretreated high-salt wastewater is obtained;

[0062] S2, ionization oxidation:

[0063] The pretreated high-salt wastewater is passed from the pretreatment device 1 to multiple ionization precipitation devices 2 for ionization oxidation treatment. A flocculant is added in the ionization channel, and the amount of the flocculant added is 50 mg / L. Then, the precipitate and the wastewater are separated into solid and liquid through the ionization channel 21 in the ionization precipitation device 2. The width of the ionization channel 21 is 8 cm. The anode in the ionization channel 21 is a carbon plate, and the cathode is a stainless steel plate. The ionization voltage is 5 V and the current density is 77 A / m 2 , the flow rate of the pretreated high-salinity wastewater in the ionization channel 21 is 5 L / min, and oxidized wastewater is obtained;

[0064] The flocculant is composed of the following components in percentage by mass: 28.2% of polyferric sulfate, 20.4% of sodium polyacrylate, 15.3% of ferrous sulfate, 12.5% ​​of powdered activated carbon, and the balance of water-soluble starch;

[0065] S3, evaporation crystallization:

[0066] The oxidized wastewater is passed into the evaporation channels 31 in the multiple evaporation and crystallization devices 3 for evaporation, the evaporation temperature is 55°C, the evaporation time is 25 minutes, the flow rate of the evaporation channel 31 is 56L / min, after the water molecules in the wastewater evaporate, the inorganic salts are precipitated to form crystals and form crystalline salt wastewater with the remaining wastewater;

[0067] S4, membrane filtration:

[0068] The crystallized salt wastewater is passed through the ultrafiltration membrane filter 4 for filtration. After the filtration is completed, the inorganic salt crystals are recovered. The average pore size of the ultrafiltration membrane is 8 nm. The high-salt wastewater filtered through the ultrafiltration membrane filter 4 is evaporated twice in the evaporation crystallization equipment 3.

[0069] Embodiment 3:

[0070] A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation comprises the following steps:

[0071] S1. Preprocessing:

[0072] The high-salt wastewater is passed into the pretreatment device 1 and filtered through the filter screen 12, the mesh number of the filter screen 12 is 14 meshes, and then the filtered high-salt wastewater is passed through the solid-liquid separation channel 13 in the pretreatment device 1 to remove suspended particles in the high-salt wastewater, the flow rate of the wastewater in the solid-liquid separation channel 13 is 6L / min, and the pretreated high-salt wastewater is obtained;

[0073] S2, ionization oxidation:

[0074] The pretreated high-salt wastewater is passed from the pretreatment device 1 to multiple ionization precipitation devices 2 for ionization oxidation treatment. A flocculant is added in the ionization channel, and the amount of the flocculant added is 50 mg / L. Then, the precipitate and the wastewater are separated into solid and liquid through the ionization channel 21 in the ionization precipitation device 2. The width of the ionization channel 21 is 10 cm. The anode in the ionization channel 21 is a carbon plate, and the cathode is a stainless steel plate. The ionization voltage is 5 V and the current density is 80 A / m 2 , the flow rate of the pretreated high-salinity wastewater in the ionization channel 21 is 6 L / min, and oxidized wastewater is obtained;

[0075] The flocculant is composed of the following components in percentage by mass: 30.2% polyferric sulfate, 23.5% sodium polyacrylate, 18.7% ferrous sulfate, 15.5% powdered activated carbon, and the balance is water-soluble starch;

[0076] S3, evaporation crystallization:

[0077] The oxidized wastewater is passed into the evaporation channels 31 in the multiple evaporation and crystallization devices 3 for evaporation, the evaporation temperature is 60°C, the evaporation time is 30 minutes, the flow rate of the evaporation channel 31 is 6L / min, after the water molecules in the wastewater evaporate, the inorganic salts are precipitated to form crystals and form crystalline salt wastewater with the remaining wastewater;

[0078] S4, membrane filtration:

[0079] The crystallized salt wastewater is passed through an ultrafiltration membrane filter 4 for filtration. After the filtration is completed, the inorganic salt crystals are recovered. The average pore size of the ultrafiltration membrane is 10 nm. The high-salt wastewater filtered through the ultrafiltration membrane filter 4 is evaporated twice in the evaporation crystallization equipment 3.

[0080] Comparing Examples 1 to 3, Example 3 has the highest recovery efficiency for high-salt wastewater, so Example 3 is the best example.

[0081] Embodiment 4:

[0082] This embodiment records the equipment used in the process of treating high-salinity wastewater based on membrane filtration and ionization oxidation of embodiment 3, including pretreatment equipment 1, ionization precipitation equipment 2, evaporation crystallization equipment 3, ultrafiltration membrane filter 4, such as Figure 3 As shown, the pretreatment equipment 1 includes a filter tank 11, a filter screen 12 is fixedly connected to the filter tank 11, a plurality of solid-liquid separation channels 13 are fixedly connected to the right side of the filter tank 11, a plurality of sedimentation tanks 14 are fixedly connected below the solid-liquid separation channels 13, a valve 15 is fixedly connected to the bottom of the sedimentation tank 14, and a temporary storage tank 16 is connected to the right end of the plurality of solid-liquid separation channels 13. The large suspended matter in the high-salinity wastewater is filtered through the filter screen 11, and then the insoluble suspended matter in the high-salinity wastewater is intercepted through the sedimentation tank 14.

[0083] Among them, the ionization precipitation equipment 2, the evaporation crystallization equipment 3, and the ultrafiltration membrane filter 4 in this embodiment are products of the prior art.

[0084] Embodiment 5:

[0085] The difference between this embodiment and embodiment 4 is that Figure 4 , Figure 5 As shown, the ionization precipitation equipment 2 includes an ionization channel 21, and the front inner wall and the rear inner wall of the ionization channel 21 are fixedly connected with an anode plate 22 and a cathode plate 23 respectively, a flocculant feeder 24 is fixedly connected to the upper left end of the ionization channel 21, a plurality of sedimentation tanks 25 are fixedly connected to the bottom of the ionization channel 21, a valve 26 is fixedly connected to the bottom of the sedimentation tank 25, the right side of the ionization channel 21 is fixedly connected to a temporary storage tank 27, the interior of the temporary storage tank 27 is fixedly connected with a liquid pump 28, and the water outlet of the liquid pump 28 is fixedly connected to a water pump 29 for connecting with the evaporation crystallization equipment 3.

[0086] The flocculant feeder 24 comprises a silo 241 , the interior of which is rotatably connected to a spiral feed rod 242 , and the top of the silo 241 is fixedly connected to a feed motor 243 for driving the spiral feed rod 242 to rotate.

[0087] A battery panel 211 for supplying power to the anode plate 22 and the cathode plate 23 and a solar power generation panel 212 for charging the battery panel 211 are fixedly connected to the top of the ionization channel 21 .

[0088] Compared with Example 4, in Example 5, the solar panel 1 212 provides electric energy to the anode plate 22 and the cathode plate 23 in the ionization channel, so that an electric field is formed between the anode plate 22 and the cathode plate 23, thereby causing the organic matter to undergo an oxidation reaction at the anode and a reduction reaction at the cathode. The flocculant is automatically added through the feeding motor 243, and the feeding speed can be changed by adjusting the speed of the feeding motor 243. The organic matter in the high-salt wastewater is ionized and oxidized through the ionization channel 21, and the insoluble inorganic precipitate produced by the ionization oxidation is intercepted by the sedimentation tank 2 25.

[0089] Embodiment 6:

[0090] The difference between this embodiment and embodiment 5 is that Figure 7 , Figure 8 As shown, the evaporation crystallization equipment 3 includes an evaporation channel 31, the top of the evaporation channel 31 is fixedly connected to a condensation channel 32, the inner bottom of the evaporation channel 31 is fixedly connected to an electric heating plate 33, the top of the condensation channel 32 is fixedly connected to a battery panel 34 for powering the electric heating plate 33 and a solar panel 35 for charging the battery panel 34, the inside of the evaporation channel 31 is fixedly connected to a condensate channel 36, the right side of the condensate channel 36 is fixedly connected to a condensation tank 37, and the right side of the evaporation channel 31 is fixedly connected to the ultrafiltration membrane filter 4.

[0091] The condensation channel 32 includes a middle channel 321, the left side of the middle channel 321 is fixedly connected to the pumping pipe 29, the front and rear sides of the middle channel 321 are fixedly connected with a reflux channel 322, the right end of the reflux channel 322 is connected to the middle channel 321, and the left end of the reflux channel 322 discharges the waste water into the evaporation channel 31.

[0092] Compared with Example 5, Example 6 uses solar energy to provide electric energy to heat wastewater, increase the evaporation of wastewater, reduce the electric energy used for wastewater treatment, and reduce the cost of wastewater treatment. The evaporated water encounters the condensation channel 32, transfers heat to the wastewater in the condensation channel 32, and then condenses and falls into the condensate channel 36, which can enhance the condensation effect and recycle the heat of the evaporated water.

[0093] Embodiment 7:

[0094] The difference between this embodiment and embodiment 6 is that Figure 2 , Figure 6 , Fig. 9As shown, the ultrafiltration membrane filter 4 includes a filtrate pool 41, a filter frame 42 is fixedly connected in the filtrate pool 41, a plurality of branch pipes 43 are fixedly connected to the filter frame 42, the left ends of the plurality of branch pipes 43 are fixedly connected to a connecting pipe 44, the right ends of the plurality of branch pipes 43 are fixedly connected to a main pipe 45, the main pipe 45 is fixedly connected to a suction pump 48, the water outlet of the suction pump 48 is fixedly connected to a reflux pipe 46, the reflux pipe 46 is fixedly connected to the pumping pipe 29, and an ultrafiltration membrane assembly 47 is fixedly connected below the branch pipe 43.

[0095] The ultrafiltration membrane assembly 47 includes a connection cover 471 , a plurality of ultrafiltration membrane tubes 472 are fixedly connected to the lower end of the connection cover 471 , and the upper end of the connection cover 471 is threadedly connected to the branch pipe 43 .

[0096] Compared with Example 6, in Example 7, the wastewater is filtered again by the ultrafiltration membrane filter 4, the precipitated inorganic salt is recovered, and the obtained high-salt wastewater is evaporated and crystallized again, thereby increasing the recovery efficiency of salt in the high-salt wastewater and increasing the economic benefits of high-salt wastewater treatment. The connection cover 471 facilitates the replacement of the ultrafiltration membrane tube 472 and facilitates maintenance.

[0097] The unloading motor 243, the liquid extraction pump 28, the liquid suction pump 48, the battery panel 1 211, the solar power generation panel 1 212, the electrolytic heating plate 33, the battery panel 2 34, and the solar power generation panel 2 212 used in the above embodiments are all commercially available products. As long as they can achieve the functions of the present invention, those skilled in the art can choose to use them according to common sense, and no special limitations are made here.

Claims

1. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation, characterized in that: The following steps are involved: S1. Preprocessing: The high-salt wastewater is passed into a pretreatment device (1) and filtered through a filter screen (12), wherein the mesh size of the filter screen (12) is 10-14 meshes, and then the filtered high-salt wastewater is passed through a solid-liquid separation channel (13) in the pretreatment device (1) to remove suspended particles in the high-salt wastewater, wherein the flow rate of the wastewater in the solid-liquid separation channel (13) is 4.5-6 L / min, thereby obtaining pretreated high-salt wastewater; S2, ionization oxidation: The pretreated high-salinity wastewater is passed from the pretreatment device (1) into a plurality of ionization precipitation devices (2) for ionization oxidation treatment, a flocculant is added into the ionization channel (21), the amount of the flocculant added is 50 mg / L, and then the precipitate and the wastewater are separated into solid and liquid through the ionization channel (21) in the ionization precipitation device (2), the width of the ionization channel (21) is 5-10 cm, the anode in the ionization channel (21) is a carbon plate, the cathode is a stainless steel plate, the ionization voltage is 5 V, and the current density is 50-80 A / m 2 , the flow rate of the pretreated high-salinity wastewater in the ionization channel (21) is 4.5-6 L / min to obtain oxidized wastewater; S3, evaporation crystallization: Passing the oxidized wastewater into the evaporation channels (31) in the plurality of evaporation and crystallization devices (3) for evaporation, the evaporation temperature is 50-60° C., the evaporation time is 20-30 min, the flow rate of the evaporation channel (31) is 4.5-6 L / min, after the water molecules in the wastewater evaporate, the inorganic salts are precipitated to form crystals and form crystalline salt wastewater with the remaining wastewater; S4, membrane filtration: The crystallized salt wastewater is passed through an ultrafiltration membrane filter (4) for filtration. After the filtration is completed, the inorganic salt crystals are recovered. The average pore size of the ultrafiltration membrane is 5-10 nm. The high-salt wastewater filtered through the ultrafiltration membrane filter (4) is evaporated again in an evaporation crystallization device (3).

2. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 1, characterized in that: The equipment used in the process for treating high-salinity wastewater based on membrane filtration and ionization oxidation comprises a pretreatment device (1), an ionization precipitation device (2), an evaporation crystallization device (3), and an ultrafiltration membrane filter (4). The pretreatment device (1) comprises a filter tank (11), a filter screen (12) is fixedly connected to the filter tank (11), a plurality of solid-liquid separation channels (13) are fixedly connected to the right side of the filter tank (11), a plurality of sedimentation tanks (14) are fixedly connected below the solid-liquid separation channels (13), a valve (15) is fixedly connected to the bottom of the sedimentation tank (14), and the right ends of the plurality of solid-liquid separation channels (13) are connected to a temporary storage tank (16).

3. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 2, characterized in that: The ionization precipitation device (2) comprises an ionization channel (21), the front inner wall and the rear inner wall of the ionization channel (21) are fixedly connected to an anode plate (22) and a cathode plate (23), respectively; a flocculant feeder (24) is fixedly connected to the upper left end of the ionization channel (21); a plurality of second precipitation tanks (25) are fixedly connected to the bottom of the ionization channel (21); a valve (26) is fixedly connected to the bottom of the second precipitation tank (25); the right side of the ionization channel (21) is fixedly connected to a second temporary storage tank (27); a liquid pump (28) is fixedly connected to the interior of the second temporary storage tank (27); and a water outlet of the liquid pump (28) is fixedly connected to a water pump (29) for connecting to the evaporation crystallization device (3).

4. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 3, characterized in that: The flocculant feeder (24) comprises a silo (241), the interior of the silo (241) is rotatably connected to a spiral feed rod (242), and the top of the silo (241) is fixedly connected to a feed motor (243) for driving the spiral feed rod (242) to rotate.

5. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 3, characterized in that: A battery panel (211) for supplying power to the anode plate (22) and the cathode plate (23) and a solar power generation panel (212) for charging the battery panel (211) are fixedly connected to the top of the ionization channel (21).

6. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 3, characterized in that: The evaporation crystallization device (3) comprises an evaporation channel (31), the top of the evaporation channel (31) is fixedly connected to a condensation channel (32), the inner bottom of the evaporation channel (31) is fixedly connected to an electric heating plate (33), the top of the condensation channel (32) is fixedly connected to a second battery panel (34) for supplying power to the electric heating plate (33) and a second solar power generation panel (35) for charging the second battery panel (34), the interior of the evaporation channel (31) is fixedly connected to a condensate channel (36), the right side of the condensate channel (36) is fixedly connected to a condensation pool (37), and the right side of the evaporation channel (31) is fixedly connected to the ultrafiltration membrane filter (4).

7. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 6, characterized in that: The condensation channel (32) comprises a middle channel (321), the left side of the middle channel (321) is fixedly connected to the water pumping pipe (29), the front and rear sides of the middle channel (321) are fixedly connected to a reflux channel (322), the right end of the reflux channel (322) is connected to the middle channel (321), and the left end of the reflux channel (322) discharges waste water into the evaporation channel (31).

8. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 2, characterized in that: The ultrafiltration membrane filter (4) comprises a filtrate pool (41), a filter frame (42) is fixedly connected inside the filtrate pool (41), a plurality of branch pipes (43) are fixedly connected to the filter frame (42), the left ends of the plurality of branch pipes (43) are fixedly connected to a connecting pipe (44), the right ends of the plurality of branch pipes (43) are fixedly connected to a main pipe (45), the main pipe (45) is fixedly connected to a suction pump (48), the water outlet of the suction pump (48) is fixedly connected to a return pipe (46), the return pipe (46) is fixedly connected to the water pump (29), and an ultrafiltration membrane assembly (47) is fixedly connected below the branch pipe (43).

9. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 8, characterized in that: The ultrafiltration membrane assembly (47) comprises a connection cover (471), a plurality of ultrafiltration membrane tubes (472) are fixedly connected to the lower end of the connection cover (471), and the upper end of the connection cover (471) is threadedly connected to the branch pipe (43).

10. A process for treating high-salinity wastewater based on membrane filtration and ionization oxidation as claimed in claim 1, characterized in that: The ultrafiltration membrane assembly (47) comprises a connection cover (471), and a plurality of ultrafiltration membrane tubes (472) are fixedly connected to the lower end of the connection cover (471).

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