Process and device for removing trace organic matter from wastewater and self-rotating regeneration of adsorbent by cyclone

Abstract

The application discloses a process and device for removing trace organic matters in wastewater and self-rotating regeneration of adsorbent by cyclone, which comprises the following steps: firstly, the wastewater enters a boiling bed separator to remove suspended matters in the wastewater; the wastewater after removal of the suspended matters enters a first adsorption tower or a second adsorption tower, and the organic matters in the wastewater are adsorbed by the adsorbent built-in the first adsorption tower or the second adsorption tower; the saturated adsorbent from the first adsorption tower or the second adsorption tower is transported into a self-rotating regeneration tower by alkali liquor, and the desorption and regeneration of the adsorbent are realized by using the self-rotation and revolution coupling motion of the saturated adsorbent in the cyclone field; the COD concentrated liquid obtained after the desorption of the adsorbent is transported to a COD advanced treatment device, the organic matters in the COD concentrated liquid are removed by oxidation, and the regenerated adsorbent is fed back into the first adsorption tower or the second adsorption tower for recycling. The process is simple and convenient to operate, no secondary pollution is caused, no waste liquid is generated, the regeneration process of the adsorbent is simple, and the regeneration effect is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of petrochemical industry and environmental protection, and particularly relates to a process and device for removing trace organic matters in wastewater and rotating adsorbent cyclone. BACKGROUND

[0002] The increasingly serious water pollution not only reduces the use function of water body, but also further aggravates the shortage of water resources, and threatens the safety of drinking water of residents. Organic pollutants are one of the most important pollutants, and with the development of industry, the types of organic pollutants entering water bodies through various channels are also increasing, and part of the organic matters are difficult to biodegrade.

[0003] The removal of organic matters in industrial wastewater is carried out by effective biological, physical and chemical technologies for separation and degradation removal. The essence of the removal of trace organic matters is a combined process of enrichment, separation and removal. According to the size and molecular species of trace organic matters, the organic matters are concentrated, and then the concentrated organic matters are removed by suitable biological, physical or chemical methods, so as to ultimately achieve the removal of trace components in wastewater. The removal of trace organic matters in industrial wastewater mainly includes biochemical method, flocculation method, oxidation method and membrane filtration method. However, the practical application shows that the above methods have certain disadvantages, such as:

[0004] Membrane filtration method can well remove macromolecular organic matters, but it is prone to membrane pollution. The combination of fouling substances and organic matters in water body aggravates the degree of membrane pollution, which rapidly reduces the flux of membrane and increases the difficulty of membrane cleaning in a short time, greatly reducing the service life of the membrane. The deficiency of flocculation method is that its efficiency is low, and in the case of low concentration, the effective collision rate in the flocculation process is too low, so it cannot effectively remove trace organic matters in industrial wastewater. Oxidation method can also achieve the degradation of organic matters in industrial wastewater, but for trace organic matters, the contact reaction probability of oxidants and organic matters is too low, resulting in high treatment cost, which is not suitable for the removal of trace organic matters.

[0005] Compared with traditional methods, adsorption method, as a low-energy solid extraction technology, has incomparable advantages in the treatment of trace organic matters in industrial wastewater. Adsorption method relies on the dense pores, large specific surface area on the adsorbent, or the multiple forces between the functional groups on the surface and the molecules of the adsorbed substances, to achieve the purpose of selectively enriching organic matters. The advantage of adsorption method is that it has good removal effect on refractory organic matters and trace organic matters, and the most commonly used adsorbents mainly include activated carbon and ion exchange resin. When the adsorbent adsorbs trace organic matters in industrial wastewater for a period of time, it will reach a saturation state, and needs to be regenerated.

[0006] Scholars have carried out a lot of research work on the removal of trace organic matters in industrial wastewater through experimental methods.

[0007] CN 1018483729A discloses a process for removing organic matter from reverse osmosis concentrated water. The process mineralizes organic matter in reverse osmosis concentrated water through ozone catalytic oxidation, improves its biodegradability, then adsorbs the organic matter by activated carbon, and degrades the organic matter adsorbed by activated carbon by biochemical method. Although this process can achieve low-cost removal of organic matter, it is difficult to biodegrade organic matter in high-salinity wastewater, so this process is not suitable for adsorption and desorption of organic matter in high-salinity wastewater, and activated carbon is not easy to be biologically regenerated.

[0008] CN 108178364A discloses a method for treating organic matter in high-salinity industrial wastewater. The main implementation steps are: adjusting the pH value of the wastewater to be acidic, then sending it to an activated carbon adsorption column for adsorption, sending the effluent to an ozone reaction device, and passing ozone for more than 20 minutes to remove organic matter in industrial wastewater. This application uses an adsorption-oxidation series process to remove organic matter in high-salinity industrial wastewater, which reduces the amount of ozone used, but the activated carbon is not regenerated after saturation, the utilization rate of ozone is low, the operation cost is high, and the activated carbon adsorbed with organic matter is not treated centrally, which will cause secondary pollution. This process is limited for removing trace organic matter in industrial wastewater.

[0009] CN 108854965A discloses a wastewater treatment activated carbon regeneration device. The main implementation steps are: saturated activated carbon in the hopper is sent to the regeneration furnace cavity by the screw conveyor, natural gas is injected into the regeneration furnace through the burner, hot air heats the activated carbon in the regeneration furnace, the organic matter adsorbed in the activated carbon volatilizes after heating, and is discharged from the top of the regeneration furnace with hot air. The air discharged from the regeneration furnace is sent into the combustion furnace as the air supply of the natural gas burner and is burned, the organic matter is completely burned, the flue gas after heating the air is discharged from the flue gas outlet, and then is dusted by the bag filter before being discharged. Although this device realizes the regeneration of activated carbon, the mechanical strength of activated carbon will decrease after thermal regeneration, the amount of carbon powder will increase during the adsorption process, which will affect the membrane process unit of the downstream water system, and the desorption tail gas treatment process is complex, which needs to use a combustion furnace for complete combustion, and the operation difficulty is large.

[0010] In summary, the current method for removing trace organic matter in industrial wastewater has the problems of incomplete treatment, secondary pollution of adsorbent, long process flow, poor regeneration effect of adsorbent, and the like. The trace organic matter in industrial wastewater cannot be effectively removed, which not only increases the operating cost of the entire system, but also affects the stability of the process system. In addition, the concentration of organic matter also enters the downstream process, which finally causes certain harm to the environment, thereby hindering the development of green industry. Poor regeneration effect of the adsorbent and complicated regeneration process operation also lead to increased energy consumption and production cost. Therefore, there is an urgent need in the art to develop a technical method for removing trace organic matter in industrial wastewater and desorption and regeneration of adsorbent, to improve the operating stability of the system device, and to meet the social goal of environmental friendliness and resource conservation. SUMMARY

[0011] To solve the above problems in the prior art, the present application provides a process and device for removing trace organic matter in wastewater and regenerating adsorbent by cyclone self-rotation,

[0012] The technical solution adopted by the present application is as follows:

[0013] The first aspect of the present application is to provide a process for removing trace organic matter in wastewater and regenerating adsorbent by cyclone self-rotation, which comprises the following steps:

[0014] S1: The wastewater enters a boiling bed separator, and the suspended solids in the wastewater are removed by the filter material of the fixed particle bed layer arranged inside the boiling bed separator;

[0015] S2: The wastewater after removal of suspended solids enters a first adsorption tower or a second adsorption tower, and the organic matter in the wastewater is adsorbed by the adsorbent built-in the first adsorption tower or the second adsorption tower;

[0016] S3: The saturated adsorbent from the first adsorption tower or the second adsorption tower is transported into a cyclone self-rotation regeneration tower by alkali liquor, and the desorption and regeneration of the adsorbent are realized by the coupling motion of the self-rotation and revolution of the saturated adsorbent in the cyclone field;

[0017] S4: The COD concentrate obtained after desorption of the adsorbent is transported to a COD advanced treatment device, and the high-concentration organic matter in the COD concentrate is removed by oxidation, so as to realize the removal of trace organic matter in wastewater. The regenerated adsorbent is supplemented into the first adsorption tower or the second adsorption tower, and is recycled.

[0018] In the embodiment of the present application, the first adsorption tower or the second adsorption tower is used alternately, specifically, when the first adsorption tower is saturated, the wastewater is switched to the second adsorption tower for adsorption, and the saturated adsorbent in the first adsorption tower is transported with the lye to the cyclone self-rotation regeneration tower for desorption and regeneration; when the second adsorption tower is saturated, the wastewater is switched back to the first adsorption tower for adsorption, and the saturated adsorbent in the second adsorption tower is transported with the lye to the cyclone self-rotation regeneration tower for desorption and regeneration, and the above process is repeated alternately.

[0019] In the embodiment of the present application, TOC analyzers are arranged on the water inlet pipes and water outlet pipes of the first adsorption tower and the second adsorption tower respectively to detect the content of TOC in the pipes, when one of the adsorption towers is running and the TOC value in the water outlet pipe reaches 50% of the TOC value in the water inlet pipe, the adsorption tower is directly switched to the other adsorption tower for continuous running, and the continuous adsorption of organic matter in the wastewater is realized.

[0020] In the embodiment of the present application, in the step S2, when the COD content at the outlet of the first adsorption tower or the second adsorption tower is higher than 50% of the COD content at the inlet, the saturated adsorbent in the adsorption tower is transported to the cyclone self-rotation regeneration tower for desorption and regeneration.

[0021] In the embodiment of the present application, in the step S3, the self-rotation speed of the adsorbent in the cyclone field of the cyclone self-rotation regeneration tower ranges from 2000 to 6000 revolutions per second, and the residence time is 2-10 seconds.

[0022] In the embodiment of the present application, in the step S4, the oxidation technology adopted by the COD deep treatment device is one or more of persulfate oxidation, hydrogen peroxide oxidation and supercritical oxidation; the waste liquid after the oxidation treatment is pumped into the first adsorption tower again for adsorption of trace organic matter, and then enters the subsequent treatment process.

[0023] The second aspect of the present application provides a device for removing trace organic matter in wastewater and regenerating adsorbent by cyclone self-rotation, comprising:

[0024] The boiling bed separator is used to remove suspended solids in the wastewater by the filter material of the fixed particle bed arranged inside;

[0025] The first adsorption tower and the second adsorption tower are connected with the boiling bed separator respectively, and are used to adsorb trace organic matter in the wastewater from the boiling bed separator by the adsorbent arranged inside;

[0026] The cyclone self-rotation regeneration tower is connected with the first adsorption tower and the second adsorption tower respectively, and is used to desorb and regenerate the saturated adsorbent from the first adsorption tower or the second adsorption tower by the micro-cyclone group arranged at the top of the tower;

[0027] COD deep treatment device: connected with the cyclone self-rotation regeneration tower, used for oxidizing treatment of the COD concentrate from the cyclone self-rotation regeneration tower to remove organic matter.

[0028] In the embodiment of the application, the microcyclone group of the cyclone self-rotation regeneration tower is composed of a plurality of microcyclones arranged in a U-U type and connected in parallel; the microcyclone comprises a cyclone cavity, a tangential inlet, an overflow outlet and a underflow outlet located at the upper part, the top end and the bottom end of the cyclone cavity respectively, and the tangential inlet, the overflow outlet and the underflow outlet of each microcyclone are connected through pipelines.

[0029] In the embodiment of the application, the saturated adsorbent outlet pipeline of the first adsorption tower or the second adsorption tower is connected with the lye pipeline in the plant; the adsorbent is selected from one or more of activated carbon, resin, walnut shell, activated coke and molecular sieve.

[0030] In the embodiment of the application, the bed filler of the boiling bed separator is selected from filter material with a particle size of 0.5-2.4 mm; one or more cyclone separators are installed at the top of the boiling bed separator; the first adsorption tower and the second adsorption tower are one or a plurality of towers connected in series.

[0031] The application has the following beneficial effects:

[0032] 1. Simple process, easy to operate. The application uses adsorption and cyclone self-rotation regeneration to remove trace organic matter in industrial wastewater, saturated adsorbent enters the cyclone self-rotation regeneration tower to realize regeneration of the adsorbent through cyclone desorption, and the regenerated adsorbent is supplemented into the adsorption tower to realize purification of organic matter in industrial wastewater; only the water inlet pipe and the water outlet pipe of the adsorption tower are provided with a TOC instrument (total organic carbon analyzer) for monitoring, and the saturated adsorbent is directly switched to the adsorption tower, which realizes continuous removal of trace organic matter in industrial wastewater and recycling of the adsorbent.

[0033] 2. No secondary pollution. The application relies on the coupling motion of the self-rotation and revolution of the adsorbent particles in the microcyclone field, uses the self-rotation of the adsorbent to strengthen the centrifugal desorption of the high-concentration organic matter liquid in the particle, and uses the periodic shock centrifugal force generated by the revolution to complete the enrichment and separation of liquid and solid, thereby realizing the regeneration of the adsorbent. The whole process does not produce VOC s and other secondary pollutants.

[0034] 3. No waste liquid is produced. The COD concentrate generated by the cyclone self-rotation regeneration tower enters the COD deep treatment device, and the COD content in the concentrate is reduced to a low level through oxidation, and the waste liquid after oxidation treatment is pumped into the adsorption tower for trace organic matter adsorption and enters the subsequent treatment process.

[0035] 4、The regeneration process is simple and has good regeneration effect. In the application, the adsorbent particles can reach a self-rotation speed of 2000-6000 revolutions per second in the cyclone field, which can provide a large enough centrifugal force to strengthen the removal of organic matters in the alkali liquor; the short time of the cyclone self-rotation process effectively improves the treatment efficiency, reduces the energy consumption and treatment cost. Compared with the conventional adsorbent regeneration methods such as heat regeneration method, ultrasonic regeneration method, electrochemical regeneration method, biological regeneration method and wet oxidation regeneration method, the service life of the adsorbent regenerated by the cyclone desorption of the application is prolonged by 50%. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic diagram of the industrial wastewater trace organic matter removal and adsorbent cyclone self-rotation regeneration device of the application.

[0037] Figure 2 is a schematic diagram of the structure of the top of the cyclone self-rotation regeneration tower.

[0038] Figure 3 is a schematic diagram of the structure of the micro-cyclone group.

[0039] Figure 4 is a schematic diagram of the structure of the micro-cyclone.

[0040] Figure 5 is a principle diagram of the desorption and separation of saturated adsorbent in the micro-cyclone.

[0041] 1-boiling bed separator; 2-first adsorption tower; 3-second adsorption tower; 4-cyclone self-rotation regeneration tower; 5-COD advanced treatment device; 41-micro-cyclone group; 42-micro-cyclone; 43-tangential inlet; 44-overflow port; 45-underflow port; 46-cyclone cavity. DETAILED DESCRIPTION

[0042] The technical solutions of the application will be described in further detail below in combination with specific embodiments, and it should be understood that the following embodiments are only used to illustrate the application and not used to limit the scope of the application.

[0043] Example 1, wastewater trace organic matter removal and adsorbent cyclone self-rotation regeneration process and device

[0044] As shown in Figures 1-2 , a wastewater trace organic matter removal and adsorbent cyclone self-rotation regeneration device, the device comprises:

[0045] Boiling bed separator 1: used for removing suspended solids in wastewater by the filter material of the fixed particle bed layer arranged inside;

[0046] The first adsorption tower 2 and the second adsorption tower 3 are connected in parallel: The first adsorption tower 2 and the second adsorption tower 3 are respectively connected to the fluidized bed separator 1 and are used to adsorb trace organic matter in the wastewater from the fluidized bed separator 1 through the built-in adsorbent.

[0047] Cyclone self-rotating regeneration tower 4: connected to the first adsorption tower 2 and the second adsorption tower 3 respectively, used to desorb and regenerate the saturated adsorbent from the first adsorption tower 2 or the second adsorption tower 3 through the micro cyclone group 41 built in the top of the tower;

[0048] COD deep treatment device 5: connected to the cyclone rotation regeneration tower 4, used to oxidize the COD concentrate from the cyclone rotation regeneration tower 4 to remove organic matter.

[0049] Furthermore, such as Figure 3 As shown, the microcyclone group 41 in the cyclone self-rotating regeneration tower 4 is composed of several microcyclones 42 arranged in parallel in a UU-shape, combined with... Figure 4 As shown, the microcyclone 42 includes a cyclone cavity 46, and a tangential inlet 43, an overflow port 44, and a bottom outlet 45 located at the upper, top, and bottom ends of the cyclone cavity 46, respectively. The tangential inlet 43, overflow port 44, and bottom outlet 45 of each microcyclone 42 are connected through pipelines.

[0050] The number of microcyclones 42 depends on the diameter of the cyclone self-rotating regeneration tower 4 and the processing requirements. For example, a cyclone self-rotating regeneration tower 4 with a diameter of 2 meters can be equipped with 238 microcyclones 42 with a column diameter of 25 mm.

[0051] Furthermore, the saturated adsorbent outlet pipeline of the first adsorption tower 2 or the second adsorption tower 3 is connected to the alkaline solution pipeline in the plant (not shown in the figure), and the saturated adsorbent discharged from the first adsorption tower 2 or the second adsorption tower 3 is transported to the cyclone self-rotating regeneration tower 4 with alkaline solution (sodium hydroxide solution) as the carrier.

[0052] like Figure 3 and Figure 4 As shown, the saturated adsorbent discharged from the first adsorption tower 2 or the second adsorption tower 3 enters the tower from the bottom of the cyclone regeneration tower 4. After rising to a certain liquid level, it enters laterally into the tangential inlet 43 at the upper end of the microcyclone 42. Within the cyclone cavity 46, the centrifugal force generated by the high-speed rotation of the saturated adsorbent (rotation speed: 2000-6000 rpm) due to the flow field characteristics overcomes the capillary resistance of the adsorbate in the pores, achieving high-efficiency and low-energy removal of the adsorbate from the adsorbent surface and pores. Simultaneously, the rapid oscillation generated by the coupled rotation and revolution of the saturated adsorbent within the microcyclone 42 alters the properties of the micro-interface between the adsorbent surface and the aqueous phase, enhancing the dehydration process.

[0053] The regenerated adsorbent and the COD concentrated liquid (i.e. saturated sodium hydroxide solution containing high concentration of COD) generated after the desorption of the saturated adsorbent in the cyclone are discharged from the bottom flow port 45 at the bottom and the overflow port 44 at the top of the micro-cyclone 42, respectively. The COD concentrated liquid is transported to the COD advanced treatment device 5 for oxidation treatment, and the regenerated adsorbent is fed back to the first adsorption tower 2 and the second adsorption tower 3 for recycling.

[0054] Further, the adsorbent is selected from one of activated carbon, resin, walnut shell, activated coke and molecular sieve.

[0055] Further, the bed filler of the boiling bed separator 1 is selected to be filter material with a particle size of 0.5-2.4 mm; one or more cyclone separators are installed at the top of the boiling bed separator 1, and the regeneration of the filter material is achieved by the coupling of the self-rotation and revolution of particles in the cyclone separator during backwashing, and the backwashing concentrated liquid is discharged from the top of the boiling bed separator 1.

[0056] Further, the bottom of the first adsorption tower 2 and the second adsorption tower 3 is provided with an adsorbent support plate (not shown in the figure), and a liquid distribution plate is arranged on the adsorbent support plate to prevent the flow deviation during the adsorption of industrial wastewater, thereby increasing the adsorption time.

[0057] Further, the first adsorption tower 2 and the second adsorption tower 3 in the device are one or multiple in series, and the specific number is determined according to the actual working conditions.

[0058] A process for removing trace organic matter from wastewater and regenerating adsorbent by cyclone self-rotation, the process comprising the following steps:

[0059] S1: the wastewater enters the boiling bed separator 1, and the suspended solids in the wastewater are removed by the filter material with fixed particle bed arranged inside the boiling bed separator 1;

[0060] S2: the wastewater after removal of suspended solids enters the first adsorption tower 2 or the second adsorption tower 3, and the organic matter in the wastewater is adsorbed by the adsorbent built-in the first adsorption tower 2 or the second adsorption tower 3;

[0061] S3: the saturated adsorbent from the first adsorption tower 2 or the second adsorption tower 3 is transported into the cyclone self-rotation regeneration tower 4 by alkali (NaOH solution), and the desorption and regeneration of the adsorbent are achieved by the coupling motion of the self-rotation and revolution of the saturated adsorbent in the cyclone field;

[0062] S4: the COD concentrated liquid obtained after the desorption of the adsorbent is transported to the COD advanced treatment device 5, and the high concentration of organic matter in the COD concentrated liquid is removed by oxidation, thereby achieving the removal of trace organic matter from wastewater; the regenerated adsorbent is fed back to the first adsorption tower 2 or the second adsorption tower 3 for recycling.

[0063] Further, the first adsorption tower 2 or the second adsorption tower 3 is used alternately, specifically, when the first adsorption tower 2 is saturated, the wastewater is switched to the second adsorption tower 3 for adsorption, and the saturated adsorbent in the first adsorption tower 2 is transported with the lye to the cyclone self-rotation regeneration tower 4 for desorption and regeneration; when the second adsorption tower 3 is saturated, the wastewater is switched to the first adsorption tower 2 for adsorption, and the saturated adsorbent in the second adsorption tower 3 is transported with the lye to the cyclone self-rotation regeneration tower 4 for desorption and regeneration, and the above process is repeated alternately.

[0064] Further, the water inlet pipe and the water outlet pipe of the first adsorption tower 2 and the second adsorption tower 3 are respectively provided with a total organic carbon analyzer (TOC analyzer) to detect the content of total organic carbon (TOC) in the pipe, when one of the adsorption towers is running, the TOC value in the water outlet pipe reaches 50% of the TOC value in the water inlet pipe, and the other adsorption tower is switched to continue running, so as to realize continuous adsorption of organic matter in the wastewater.

[0065] Further, in the step S2, when the COD content at the outlet of the first adsorption tower 2 or the second adsorption tower 3 is higher than 50% of the COD content at the inlet, the saturated adsorbent in the adsorption tower is transported to the cyclone self-rotation regeneration tower 4 for desorption and regeneration.

[0066] Further, in the step S3, the adsorbent is in a coupling motion of cyclone revolution and particle self-rotation in the cyclone field of the cyclone self-rotation regeneration tower 4, the self-rotation speed ranges from 2000 to 6000 revolutions per second, and the residence time is 2-10 seconds.

[0067] Further, in the step S4, the oxidation technology adopted by the COD deep treatment device 5 is one of persulfate oxidation, hydrogen peroxide oxidation and supercritical oxidation; after treatment, the COD concentration is reduced from 1500-2000 mg / L to below 100 mg / L, and the waste liquid after oxidation treatment is pumped into the adsorption tower again for trace organic matter adsorption, and then enters the subsequent treatment process.

[0068] Further, in the step S2, the wastewater from the boiling bed separator 1 is adsorbed by the first adsorption tower 2 or the second adsorption tower 3 to remove COD, and then enters the next desalination process.

[0069] In the embodiment, when the concentration of suspended solids in the wastewater entering the boiling bed separator 1 is not higher than 5000 mg / L, the step S1 can effectively remove the suspended solids in the wastewater, and the concentration of suspended solids in the wastewater is reduced to below 50 mg / L.

[0070] In this embodiment, when the COD concentration in the wastewater entering the first adsorption tower 2 is not higher than 200 mg / L, after step S2, the COD concentration in the wastewater drops to below 40 mg / L; if the COD concentration in the wastewater is still higher than 200 mg / L after step S2, one or more first adsorption towers 2 or second adsorption towers 3 are connected in series to continue adsorption until the COD concentration in the wastewater drops to below 30 mg / L.

[0071] like Figure 5 As shown, the separation principle of the saturated adsorbent in the microcyclone 42 is as follows:

[0072] Figure 5 In the diagram, the red curve represents the flow curve of the adsorbent solution, the black curve represents the flow curve of the COD concentrate, the green dots represent the adsorbent, and the black dots represent organic matter.

[0073] After the sodium hydroxide solution carries the saturated adsorbent particles into the swirling chamber 46 of the microcyclone 42 through the tangential inlet 43, the particle's migration motion changes from radial migration to helical curvilinear motion. Because the density of the saturated adsorbent particles is much greater than that of the sodium hydroxide aqueous solution, the particles quickly migrate radially to the vicinity of the wall of the microcyclone 42 under the strong centrifugal force. In the strong shear flow of the boundary layer and the collision with the wall, the saturated adsorbent particles undergo high-speed rotation. This high-speed rotation creates periodically varying stress-enhancing regions on the surface of the saturated adsorbent particles, and also subjectes the organic matter adsorbed in the internal pores of the adsorbent particles to periodically varying coupled centrifugal forces. Simultaneously, the sodium hydroxide solution increases the surface energy of the adsorbent, promoting chemical reactions of the organic matter enriched on the adsorbent surface and in the pores. Under the influence of these three factors, the organic matter on the surface and in the internal pores of the saturated adsorbent can be effectively removed.

[0074] After the organic matter on the adsorbent is removed, it dissolves in the sodium hydroxide solution (forming a liquid phase). In the swirling flow field, there are actually two phases: a liquid phase and adsorbent particles. Under the centrifugal separation effect of the swirling flow field, the less dense liquid phase enters the inner swirling flow and is eventually discharged from the overflow port 43; while the denser, regenerated adsorbent particles are discharged from the underflow port 45 of the micro-swirler 42 with the outer swirling flow. Ultimately, the removal of organic matter from the adsorbent and the high-speed separation of the liquid and solid phases are simultaneously achieved in the swirling flow field.

[0075] Example 2, Application Example

[0076] Engineering examples based on the apparatus and method of Embodiment 1 above:

[0077] For 10m 3The process for treating trace organic matter in coal chemical industry high-salinity wastewater with a capacity of 10 m

[0078] 1. The water quality conditions of the incoming water are shown in Table 1 below:

[0079] Table 1

[0080]

[0081]

[0082] 2. Implementation process and effects

[0083] The coal chemical industry high-salinity wastewater with a capacity of 10 m 3 / h is pumped into the boiling bed separator 1 to remove suspended solids, and the SS is reduced to less than 5 mg / L. Then the wastewater is pumped into the first adsorption tower 2, and the COD is reduced to 30 mg / L. The saturated adsorbent in the first adsorption tower 2 is transported into the cyclonic self-rotation regeneration tower 5 by means of an alkaline solution (NaOH solution). The adsorbent in the cyclonic self-rotation regeneration tower 5 has a coupling motion of self-rotation and revolution in the cyclonic field. The self-rotation of the adsorbent intensifies the centrifugal desorption of the high-concentration organic matter liquid in the particles, and the periodic shock centrifugal force generated by the revolution of the adsorbent completes the enrichment and separation of the liquid and solid. The COD content in the COD concentrate after centrifugal separation is 2000 mg / L. The COD concentrate is pumped into the COD advanced treatment device 5, and the peroxysulfate is used to oxidize the COD. The COD in the coal chemical industry wastewater after oxidation treatment is less than 200 mg / L, which is pumped into the first adsorption tower 2 for trace organic matter adsorption, and then into the subsequent system for further treatment.

[0084] The novel process of the application has stable treatment effect on suspended solids and trace organic matters, can effectively remove trace organic matters in wastewater, can prolong the service life of reverse osmosis membrane and shorten the chemical cleaning frequency of the reverse osmosis membrane when the coal chemical wastewater from which COD is removed is subjected to desalination process, simultaneously lays a foundation for the purification of industrial salt in the rear end, and the oxidation device in the COD deep treatment device 5 does not introduce other impurity components into the whole coal chemical wastewater treatment system.

[0085] Under the same influent water quality conditions, the adsorption capacity of the adsorbent after cyclone enhanced regeneration is basically the same as that of fresh adsorbent, and the adsorption performance of the same batch of adsorbent begins to decline only after 200 times of "adsorption-saturation-regeneration". Compared with conventional adsorbent regeneration methods such as heat regeneration method, ultrasonic regeneration method, electrochemical regeneration method, biological regeneration method and wet oxidation regeneration method, the service life of the adsorbent regenerated by the cyclone desorption regeneration method of the application is prolonged by 50%. In summary, the process of the application effectively removes trace organic matter in wastewater, realizes efficient regeneration and recycling of the adsorbent, and saves production cost.

[0086] The above listed embodiments are only the preferred embodiments of the application, and are not intended to limit the scope of the application. Any equivalent changes and modifications made according to the content of the patent application scope of the application should be within the technical scope of the application.

[0087] All the documents mentioned in the application are applied as reference in the application, just as each document is individually cited as reference. In addition, it should be understood that after reading the above teaching content of the application, those skilled in the art can make various substitutions or modifications to the application, and these equivalent forms also fall within the scope defined by the claims attached to the application.

Claims

1. A process for removing trace organic matter from wastewater and regenerating the adsorbent via cyclone rotation, characterized in that, Includes the following steps: S1: Wastewater enters the fluidized bed separator, where suspended solids are removed by the filter media of the fixed granular bed inside; after filtration, the concentration of suspended solids in the wastewater is less than 5 mg / L; S2: The wastewater after removing suspended solids enters the first adsorption tower or the second adsorption tower, where the organic matter in the wastewater is adsorbed by the adsorbent built into the first adsorption tower or the second adsorption tower; the adsorbent is selected from one or more of activated carbon, resin, walnut shell, activated coke and molecular sieve. S3: The saturated adsorbent from the first or second adsorption tower is transported into the cyclone regeneration tower via alkaline solution. The top of the cyclone regeneration tower is equipped with a microcyclone group consisting of several microcyclones arranged in parallel in a U-U pattern. The adsorbent is desorbed and regenerated by utilizing the coupled rotation and revolution of the saturated adsorbent in the cyclone field. The rotation speed of the adsorbent in the cyclone regeneration tower ranges from 2000 to 6000 rpm, and the residence time is 2 to 10 seconds. S4: The COD concentrate obtained after adsorbent desorption is transported to the COD deep treatment unit, where high-concentration organic matter in the COD concentrate is removed by oxidation, thereby achieving the removal of trace organic matter in the wastewater; the regenerated adsorbent is fed back into the first adsorption tower or the second adsorption tower for recycling.

2. The process for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation according to claim 1, characterized in that, The first adsorption tower or the second adsorption tower is used alternately. Specifically, when the first adsorption tower is saturated, the wastewater is switched to the second adsorption tower for adsorption, and the saturated adsorbent in the first adsorption tower is transported with the alkaline solution to the cyclone self-rotating regeneration tower for desorption and regeneration. When the second adsorption tower is saturated, the wastewater is switched back to the first adsorption tower for adsorption, and the saturated adsorbent in the second adsorption tower is transported with the alkaline solution to the cyclone self-rotating regeneration tower for desorption and regeneration. This cycle is repeated.

3. The process for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation according to claim 1, characterized in that, The first and second adsorption towers are equipped with TOC analyzers on their inlet and outlet pipes to detect the TOC content in the pipes. When one adsorption tower is running, if the TOC value in its outlet pipe reaches 50% of the TOC value in its inlet pipe, it will be switched to the other adsorption tower to continue running, thus achieving continuous adsorption of organic matter in the wastewater.

4. The process for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation according to claim 1, characterized in that, In step S2, when the COD content at the outlet of the first adsorption tower or the second adsorption tower is higher than 50% of the COD content at its inlet, the saturated adsorbent in the adsorption tower is transported to the cyclone self-rotating regeneration tower for desorption and regeneration.

5. The process for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation according to claim 1, characterized in that, In step S4, the oxidation technology used in the COD deep treatment device is one or more of persulfate oxidation, hydrogen peroxide oxidation, and supercritical oxidation; after the oxidation treatment is completed, the waste liquid is pumped back into the first adsorption tower for the adsorption of trace organic matter, and then enters the subsequent treatment process.

6. A device for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation, characterized in that, The device includes: Fluidized bed separator: Used to remove suspended solids from wastewater through a filter media with an internal fixed granular bed; the concentration of suspended solids after passing through the fluidized bed separator is less than 5 mg / L; The first and second adsorption towers are connected in parallel: The first and second adsorption towers are respectively connected to the fluidized bed separator and are used to adsorb trace organic matter in the wastewater from the fluidized bed separator through the built-in adsorbent. Cyclone Rotation Regeneration Tower: Connected to the first adsorption tower and the second adsorption tower respectively, it is used to desorb and regenerate the saturated adsorbent from the first adsorption tower or the second adsorption tower through a microcyclone array built into the top of the tower; the microcyclone array of the cyclone rotation regeneration tower is composed of several microcyclones arranged in parallel in a UU-shaped configuration; each microcyclone includes a cyclone chamber, and tangential inlet, overflow port and underflow port located at the upper, top and bottom of the cyclone chamber respectively, and the tangential inlet, overflow port and underflow port of each microcyclone are connected through pipelines; COD deep treatment device: connected to the cyclone regeneration tower, used to oxidize the COD concentrate from the cyclone regeneration tower to remove organic matter; The spin speed of the adsorbent in the swirling field of the swirl regeneration tower ranges from 2000 to 6000 revolutions per second, and the residence time is 2 to 10 seconds.

7. The apparatus for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation according to claim 6, characterized in that, The saturated adsorbent outlet pipeline of the first or second adsorption tower is connected to the alkaline solution pipeline in the plant; the adsorbent is selected from one or more of activated carbon, resin, walnut shell, activated coke and molecular sieve.

8. The apparatus for removing trace organic matter from wastewater and regenerating the adsorbent by cyclone rotation according to claim 6, characterized in that, The bed packing material of the fluidized bed separator is selected from filter media with a particle size of 0.5-2.4 mm; one or more hydrocyclones are installed on the top of the fluidized bed separator; the first adsorption tower and the second adsorption tower are one or more in series.

Images