Process for removing urea micromolecules from reclaimed water in electronic industry

Abstract

The invention belongs to the technical field of multi-stage treatment of water, and particularly relates to a process for removing urea micromolecules from reclaimed water in the electronic industry, which comprises the following steps: pumping the reclaimed water into a pretreatment tank, and adding a coagulant and a coagulant aid to aggregate suspended solids and colloidal particles into larger flocs; then, organic matters and small-particle impurities in the water are adsorbed, and the turbidity is reduced; recycled water is conveyed into the pretreatment cylinder through a liquid inlet pipe; a flocculating agent and a coagulant aid are added, so that suspended solids and colloidal particles are gathered into large flocs; after the flocculation is completed, adsorbing macromolecules by using an activated carbon plate; the wastewater with organic matter removed flows downwards to the flow guide plate, the flow guide plate is used for reducing the downward flowing speed of the wastewater, light ultraviolet radiation is provided in the pretreatment stage through the first ultraviolet lamp tube, partial degradation of macromolecular organic matter, turbidity reduction and bacteriostasis are achieved, and multi-stage treatment of water, wastewater or sewage in the pretreatment stage is achieved.

Description

Technical Field

[0001] This invention belongs to the field of multi-stage water treatment technology, specifically a process for removing small molecules of urea from reclaimed water in the electronics industry. Background Technology

[0002] As a major water user, the electronics industry is developing a future direction for preparing and reusing recycled water. However, since small molecule organic matter such as urea cannot be effectively removed during the treatment of recycled water, the utilization rate of recycled water in the electronics industry is low. Therefore, multi-stage treatment of recycled water, wastewater or sewage in the electronics industry is required.

[0003] A Chinese patent with publication number CN217627963U discloses a system for removing small molecule organic matter from refined electronic reclaimed water. This system can effectively remove small molecule organic matter, including urea, thereby improving the utilization rate of electronic reclaimed water. It includes an inlet, a catalytic reaction system, and an outlet connected in sequence. An oxidant dosing system is provided between the inlet and the catalytic reaction system, including an ozone dosing port and a persulfate dosing port. The catalytic reaction system is equipped with staggered catalytic baffles and a baffle-type ultraviolet light source arranged along the flow direction of the liquid within the system. The catalytic baffles are coated with titanium dioxide. Ozone added through the ozone and persulfate dosing ports reacts with persulfate through the catalytic reaction system to simultaneously catalyze the ultraviolet light, generating hydroxyl radicals, sulfate radicals, and superoxide radicals. The synergistic effect of these multiple highly oxidizing free radicals enhances the removal of small molecule organic matter from the water.

[0004] In current technologies, reclaimed water contains large particulate impurities and colloids. When the reclaimed water flows through the catalytic baffle, it will deposit on the coating surface of the catalytic baffle, blocking the active sites and hindering the transmission of ultraviolet light and the generation of free radicals. In addition, some macromolecules in the reclaimed water will preferentially react with hydroxyl radicals and sulfate radicals if no pretreatment is performed, resulting in the waste of oxidant. Therefore, multi-stage treatment of water, wastewater or sewage is required.

[0005] Therefore, the present invention provides a process for removing small urea molecules from reclaimed water in the electronics industry. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: The process for removing small molecules of urea from reclaimed water in the electronics industry, as described in this invention, includes the following steps:

[0008] S1: the reclaimed water is pumped into the pretreatment tank, coagulant and coagulant aid are added to make suspended solids and colloidal particles aggregate into larger flocs; then the turbidity is reduced by adsorbing organic matter and small particle impurities in water;

[0009] S2: the filtered wastewater is subjected to preliminary degradation of macromolecular organic matter by ultraviolet light, so as to reduce the load of urea, and a pretreated solution is obtained;

[0010] S3: the pretreated solution is pumped into the oxidation tank, ozone and peroxymonosulfate are added respectively, and hydroxyl radicals, sulfate radicals and superoxide radicals are generated simultaneously under ultraviolet catalysis, so as to strengthen the oxidative decomposition of small molecular organic matter such as urea;

[0011] S4: the catalyzed solution needs to be subjected to adsorption to remove small molecules of urea;

[0012] S5: finally, the solution is pumped into the reduction tank, and deep purification is carried out by adding a reducing agent, so as to be used for multi-stage treatment of water, wastewater or sewage.

[0013] Preferably, the pretreatment tank adopts a pretreatment cylinder, a filter plate is fixedly connected to the inner wall of the pretreatment cylinder, and a cleaning mechanism is arranged on the filter plate; a discharge hopper is rotatably connected to the middle inner wall of the pretreatment cylinder through a bearing, and an activated carbon plate is fixedly connected to the bottom of the discharge hopper through four connecting rods; a plurality of guide plates are fixedly connected to the bottom end of the pretreatment cylinder, the guide plates are all arranged in an inclined manner, and the low end of each guide plate has a flow gap with the pretreatment cylinder; a plurality of first ultraviolet lamp tubes are installed on each guide plate; two feeding cylinders are installed on the top of the pretreatment cylinder, and flocculant and coagulant aid are respectively placed in the two feeding cylinders; a liquid inlet pipe is fixedly connected to the top of the pretreatment cylinder in communication, and a first liquid outlet pipe is fixedly connected to the bottom of the pretreatment cylinder in communication.

[0014] Preferably, the cleaning mechanism comprises a first rotating rod, a first motor is installed on the top of the pretreatment cylinder through a lifting mechanism, the first rotating rod is fixedly connected to the output shaft of the first motor, a plurality of stirring rods are installed on the first rotating rod, and a plurality of arc-shaped plates are slidably installed on the bottom end of the first rotating rod through two limiting rods; the bottom of each arc-shaped plate is attached to the top of the filter plate; a discharge bin is installed on the side wall of the pretreatment cylinder, and the bottom inner wall of the discharge bin is attached to the top of the filter plate.

[0015] Preferably, the lifting mechanism comprises a fixed frame fixedly connected to the top of the pretreatment cylinder, a first electric push rod is fixedly connected to the top of the fixed frame, an lifting plate is fixedly connected to the output end of the first electric push rod, the first motor is fixedly connected to the bottom of the lifting plate, two vertical rods are fixedly connected between the fixed frame and the pretreatment cylinder, and the lifting plate is slidably connected on the two vertical rods; a limiting block is fixedly connected to the bottom of the first rotating rod, a matching block is fixedly connected to the inner wall of the discharge hopper through a connecting frame, and the limiting block and the matching block are inserted and matched.

[0016] Preferably, the inside of the feeding cylinder is provided with spiral blades, the top end of the first rotating rod is fixedly connected with a plurality of partition plates, the top of the partition plate is attached to the bottom surface of the feeding cylinder; the bottom end of the feeding cylinder is provided with an electromagnetic valve.

[0017] Preferably, the side of the pretreatment cylinder is provided with an oxidation cylinder, one end of the first liquid discharge pipe is fixedly connected to the top end side wall of the oxidation cylinder, the top of the oxidation cylinder is fixedly connected with a feeding hopper, the top of the oxidation cylinder is fixedly connected with an L-shaped plate, the bottom of the L-shaped plate is fixedly connected with a second motor, the output shaft of the second motor is fixedly connected with a second rotating rod, the second rotating rod is rotatably connected to the oxidation cylinder through a bearing, a plurality of stirring blades are installed on the second rotating rod; a second ultraviolet lamp tube is attached and installed on the inner wall of the oxidation cylinder.

[0018] Preferably, the inside of the second rotating rod is embeddedly fixedly connected with an air inlet pipe, the top end of the air inlet pipe extends to the outside of the second rotating rod and is provided with a one-way valve, a plurality of through holes are formed in the second rotating rod, a plurality of air outlet ports are formed in the bottom end of the air inlet pipe, and the air outlet ports are in communication with the through holes.

[0019] Preferably, the top of the oxidation cylinder is fixedly connected with a second electric push rod, the output end of the second electric push rod is fixedly connected with a push plate, the side wall of the push plate is fixedly connected with a mounting pipe, the mounting pipe is sleeved with a butt joint pipe, and the butt joint pipe is externally connected with an ozone source; a second magnetic block is fixedly connected to the outer wall of the mounting pipe, and a first magnetic block is fixedly connected to the outer wall of the air inlet pipe; the mounting pipe and the air inlet pipe are cooperatively sleeved, and the first magnetic block and the second magnetic block are magnetically attracted.

[0020] Preferably, the side of the oxidation cylinder is provided with a reduction cylinder, the bottom of the oxidation cylinder is fixedly connected to the top end side wall of the reduction cylinder through a second liquid discharge pipe; the side wall of the reduction cylinder is fixedly connected with a feeding hopper; and a biological membrane is installed on the top end inner wall of the reduction cylinder.

[0021] Preferably, the bottom of the reduction cylinder is provided with a magnetic stirrer, a mounting bracket is fixedly connected to the inner wall of the reduction cylinder, a third rotating rod is rotatably connected to the mounting bracket through a bearing, and a plurality of stirring paddles are fixedly connected to the outer wall of the third rotating rod.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The process for removing urea small molecules from recycled water in the electronic industry, by the cooperation of the filter plate, activated carbon plate and first ultraviolet lamp, first, the recycled water is transported into the pretreatment cylinder through the liquid inlet pipe; then the flocculant and coagulant are respectively put into the feeding cylinder, the suspended solids and colloidal particles are aggregated into larger flocs by the reaction of flocculant and wastewater, and the flocculation is facilitated by the help of coagulant; after the flocculation is completed, the activated carbon plate is used for adsorbing macromolecules, avoiding the accumulation of by-products, and simplifying the subsequent advanced treatment; the wastewater after removing organic matter flows downward to the flow guide plate, the top of the flow guide plate is packaged with a plurality of first ultraviolet lamp tubes, the flow guide plate is used to slow down the downward flow speed of the wastewater, and the first ultraviolet lamp tube is used to provide light ultraviolet radiation in the pretreatment stage, realize the partial degradation of macromolecular organic matter, reduce turbidity and inhibit bacteria, and prepare for the subsequent advanced oxidation, realizing the multi-stage treatment of water, wastewater or sewage in the pretreatment stage.

[0024] 2. The process for removing urea small molecules from recycled water in the electronic industry, by setting the lifting mechanism, the filter plate and the activated carbon plate are respectively treated, when the activated carbon plate needs to be cleaned, the first electric push rod is opened, the first electric push rod drives the first motor to move downward through the output end of the first electric push rod, the first motor drives the first rotating rod to move downward, the first rotating rod drives the limiting block to move downward, the limiting block moves downward and contacts with the matching block to stop moving; then the first motor is opened, the first motor drives the first rotating rod to rotate through the output shaft of the first motor, the first rotating rod drives the limiting block to rotate, and the limiting block drives the matching block to rotate; when the activated carbon rotates, clean water is input into the delivery pipe through the delivery water pipe, the clean water is input into the fixed pipe through the delivery pipe, and then the clean water is sprayed out of the rotating spray head to perform backflushing on the activated carbon plate, and at the same time, the suction pump is opened, and the adsorbents and impurities are discharged from the discharge pipe.

[0025] 3. The process for removing urea small molecules from recycled water in the electronic industry, by setting the docking pipe and the air inlet pipe, the docking pipe is used for sleeving in the inside of the air inlet pipe, and the first magnetic block and the second magnetic block are magnetically attracted, so that the docking pipe and the air inlet pipe are installed tightly, the ozone is input into the air inlet pipe through the docking pipe, when the docking pipe is not working, the second electric push rod needs to be opened, the one-way valve is closed, the push plate is moved by the output end of the second electric push rod, the mounting pipe is moved by the push plate, the docking pipe is moved by the mounting pipe, the docking pipe is separated from the air inlet pipe, and the first magnetic block and the second magnetic block are no longer attached; so as not to hinder the rotation of the second rotating rod. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described below with reference to the drawings.

[0027] Figure 1 is the process flow chart of the application;

[0028] Figure 2is a perspective view of the present application;

[0029] Figure 3 is a sectional view in the present application;

[0030] Figure 4 is a structural schematic view of the pretreatment cylinder in the present application;

[0031] Figure 5 is a structural schematic view of the arc-shaped plate in the present application;

[0032] Figure 6 is a structural schematic view of the discharge hopper and the activated carbon plate in the present application;

[0033] Figure 7 is a structural schematic view of the partition plate in the present application;

[0034] Figure 8 is a structural schematic view of the oxidation cylinder in the present application;

[0035] Figure 9 is a structural schematic view of the second rotating rod in the present application;

[0036] Figure 10 is a structural schematic view of the butt joint pipe in the present application;

[0037] In the figure: 1, pretreatment cylinder; 11, feeding cylinder; 12, fixed frame; 121, first electric push rod; 122, lifting plate; 123, vertical rod; 124, first motor; 125, first rotating rod; 126, arc-shaped plate; 127, limiting block; 128, limiting rod; 129, partition plate; 13, liquid inlet pipe; 14, filter plate; 15, discharge bin; 16, discharge hopper; 161, connecting frame; 162, matching block; 163, connecting rod; 17, activated carbon plate; 171, discharge pipe; 172, conveying pipe; 173, fixed pipe; 18, flow guide plate; 181, first ultraviolet lamp; 19, first liquid discharge pipe; 2, oxidation cylinder; 21, L-shaped plate; 22, second motor; 23, second rotating rod; 231, through hole; 24, feeding hopper; 25, air inlet pipe; 251, one-way valve; 252, first magnetic block; 26, second electric push rod; 261, push plate; 262, mounting pipe; 263, butt joint pipe; 264, second magnetic block; 27, second liquid discharge pipe; 28, second ultraviolet lamp; 3, reduction cylinder; 31, feeding hopper; 32, biological membrane; 33, mounting frame; 34, third rotating rod; 35, stirring paddle; 36, magnetic stirrer. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0039] As Figure 1As shown, the process for removing small molecules of urea from reclaimed water in the electronic industry according to the embodiment of the present application comprises the following steps:

[0040] S1: Pump the reclaimed water into the pretreatment tank, add coagulant and coagulant aid, so that the suspended solids and colloidal particles are aggregated into larger flocs; then adsorb the organic matter and small particle impurities in the water to reduce turbidity;

[0041] S2: The filtered wastewater is preliminarily degraded by ultraviolet light to degrade macromolecular organic matter and reduce the load of urea, to obtain a pretreated solution;

[0042] S3: Pump the pretreated solution into the oxidation tank, and add ozone and peroxymonosulfate respectively, which synchronously generate hydroxyl radicals, sulfate radicals and superoxide radicals under ultraviolet catalysis, to strengthen the oxidative decomposition of small molecule organic matter such as urea;

[0043] S4: The catalyzed solution needs to be adsorbed to remove small molecules of urea;

[0044] S5: Finally, pump the solution into the reduction tank, and add a reducing agent for deep purification, to realize multi-stage treatment of water, wastewater or sewage.

[0045] Electronic industry is a major water user, and the preparation of reclaimed water for reuse has become the development direction in the future. However, due to the fact that small molecule organic matter such as urea cannot be effectively removed during the treatment of reclaimed water, the utilization rate of reclaimed water in the electronic industry is low, and therefore, multi-stage treatment of reclaimed water, wastewater or sewage in the electronic industry is needed. In the prior art, the reclaimed water contains large particle impurities and colloids, which will deposit on the surface of the plated layer of the catalytic folded plate when the reclaimed water flows through the catalytic folded plate, thereby blocking the active sites, hindering the transmission of ultraviolet light and the generation of free radicals, and causing waste of oxidizing agent if the macromolecules in the reclaimed water are not pretreated. The macromolecules will preferentially react with hydroxyl radicals and sulfate radicals. In the present application, when removing small molecules of urea, the reclaimed water is first pumped into the pretreatment tank, coagulant and coagulant aid are added, so that the suspended solids and colloidal particles are aggregated into larger flocs; then the organic matter and small particle impurities in the water are adsorbed to reduce turbidity; then the filtered wastewater is preliminarily degraded by ultraviolet light to degrade macromolecular organic matter and reduce the load of urea, to obtain a pretreated solution; then the pretreated solution is pumped into the oxidation tank, and ozone and peroxymonosulfate are added respectively, which synchronously generate hydroxyl radicals, sulfate radicals and superoxide radicals under ultraviolet catalysis, to strengthen the oxidative decomposition of small molecule organic matter such as urea; then the catalyzed solution needs to be adsorbed to remove small molecules of urea; finally, the solution is pumped into the reduction tank, and a reducing agent is added for deep purification, to realize multi-stage treatment of water, wastewater or sewage.

[0046] As Figures 3 to 6As shown, the pretreatment tank adopts a pretreatment cylinder 1, the inner wall of the pretreatment cylinder 1 is fixedly connected with a filter plate 14, the filter plate 14 is provided with a cleaning mechanism; the middle inner wall of the pretreatment cylinder 1 is rotatably connected with a discharge hopper 16 through a bearing, the bottom of the discharge hopper 16 is fixedly connected with an activated carbon plate 17 through four connecting rods 163; the bottom end of the pretreatment cylinder 1 is fixedly connected with a plurality of guide plates 18, the guide plates 18 are all arranged obliquely, and the low end of the guide plates 18 all has a flow gap with the pretreatment cylinder 1; the guide plates 18 are all installed with a plurality of first ultraviolet lamp tubes 181; the top of the pretreatment cylinder 1 is installed with two feeding cylinders 11, respectively containing a flocculating agent and a coagulant aid; the top of the pretreatment cylinder 1 is fixedly connected with a liquid inlet pipe 13 in communication, and the bottom of the pretreatment cylinder 1 is fixedly connected with a first liquid outlet pipe 19 in communication.

[0047] The pretreatment cylinder 1 provided by the application is used in the following way: firstly, the reclaimed water is delivered into the pretreatment cylinder 1 through the liquid inlet pipe 13; then the flocculating agent and the coagulant aid are respectively put into the feeding cylinders 11, the flocculating agent reacts with the wastewater to gather suspended solids and colloidal particles into larger flocs, and the coagulant aid helps to quickly flocculate, preventing the wastewater from flowing to the next process without being flocculated within a set time; after flocculation, the control valve at the bottom of the discharge hopper 16 is periodically opened, the flocculated wastewater flows onto the activated carbon plate 17 through the filter plate 14 and the discharge hopper 16, and is adsorbed by the activated carbon plate 17, since ozone and peroxodisulfate need to generate hydroxyl radicals and other strong oxidizing free radicals under ultraviolet catalysis to target decompose small-molecule organic matter such as urea; however, if large-molecule organic matter remains in the reclaimed water, it will preferentially react with the free radicals, causing a large amount of invalid consumption of the oxidant; the activated carbon adsorption can block this path, avoid the accumulation of by-products, and simplify the subsequent advanced treatment; the wastewater after removal of organic matter flows downward to the guide plates 18, the top of the guide plates 18 is packaged with a plurality of first ultraviolet lamp tubes 181, the guide plates 18 are used to slow down the downward flow of the wastewater, and the first ultraviolet lamp tubes 181 are used to provide light ultraviolet irradiation in the pretreatment stage, realize partial degradation of large-molecule organic matter, reduce turbidity and inhibit bacteria, and prepare for subsequent advanced oxidation, realizing multi-stage treatment of water, wastewater or sewage in the pretreatment stage.

[0048] As Figure 3 and Figure 5As shown, the cleaning mechanism comprises a first rotating rod 125, the top of the pretreatment cylinder 1 is provided with a first motor 124 through a lifting mechanism, the first rotating rod 125 is fixedly connected to the output shaft of the first motor 124, a plurality of stirring rods are installed on the first rotating rod 125, and the bottom end of the first rotating rod 125 is slidably provided with a plurality of arc-shaped plates 126 through two limiting rods 128; the bottom of the arc-shaped plate 126 is attached to the top of the filter plate 14; a discharge bin 15 is installed on the side wall of the pretreatment cylinder 1, and the bottom inner wall of the discharge bin 15 is attached to the top of the filter plate 14.

[0049] The cleaning mechanism provided by the present application can clean the flocculating material quickly. When the cleaning mechanism is used, after a period of time, there is more flocculating material on the filter plate 14. If the cleaning is not timely, the filter plate 14 may be blocked, and even under the impact of water flow, the subsequent process is finally carried out, causing the blockage of the subsequent equipment, and the more flocculating material in the pretreatment cylinder 1 affects the continuous filtration of wastewater. Therefore, the first motor 124 is started, the output shaft of the first motor 124 drives the first rotating rod 125 to rotate, the first rotating rod 125 drives the limiting rod 128 to rotate, the limiting rod 128 drives the arc-shaped plate 126 to rotate, and the arc-shaped plate 126 drives the flocculating material to rotate centrifugally, and finally the flocculating material is discharged from the discharge bin 15, realizing the function of quickly cleaning the flocculating material. The first rotating rod 125 drives the stirring rod to rotate when rotating, so as to promote the flocculation reaction of wastewater, flocculating agent and coagulant.

[0050] As shown in Figure 3 , Figure 5 and Figure 6 , the lifting mechanism comprises a fixed frame 12 fixedly connected to the top of the pretreatment cylinder 1, a first electric push rod 121 is fixedly connected to the top of the fixed frame 12, an lifting plate 122 is fixedly connected to the output end of the first electric push rod 121, the first motor 124 is fixedly connected to the bottom of the lifting plate 122, two vertical rods 123 are fixedly connected between the fixed frame 12 and the pretreatment cylinder 1, and the lifting plate 122 is slidably connected on the two vertical rods 123; the bottom of the first rotating rod 125 is fixedly connected with a limiting block 127, a matching block 162 is fixedly connected to the inner wall of the discharge hopper 16 through a connecting frame 161, and the limiting block 127 and the matching block 162 are inserted and matched.

[0051] The lifting mechanism is used for adjusting the height of the first rotating rod 125, facilitating cleaning of the filter plate 14 and the activated carbon plate 17, and when the activated carbon plate 17 needs to be cleaned, the first electric push rod 121 is turned on, the first electric motor 124 is driven to move downward by the output end of the first electric push rod 121, the first rotating rod 125 is driven to move downward by the first electric motor 124, the limiting block 127 is driven to move downward by the first rotating rod 125, the limiting block 127 is in contact with the matching block 162 and stops moving; then the first electric motor 124 is turned on, the first rotating rod 125 is driven to rotate by the output shaft of the first electric motor 124, the limiting block 127 is driven to rotate by the first rotating rod 125, and the matching block 162 is driven to rotate by the limiting block 127, wherein the limiting block 127 and the matching block 162 form a sector, the limiting block 127 drives the matching block 162 to rotate when rotating, the connecting frame 161 is driven to rotate by the matching block 162, the discharge hopper 16 is driven to rotate by the connecting frame 161, and the connecting rod 163 and the activated carbon plate 17 are driven to rotate by the discharge hopper 16; the discharge pipe 171 is communicated and fixed on one side wall of the pretreatment cylinder 1, the top of the activated carbon plate 17 is located at 1 / 3 of the height of the discharge pipe 171, and a suction pump is installed on the discharge pipe 171; the conveying pipe 172 is arranged on the other side wall of the pretreatment cylinder 1, the fixed pipe 173 is fixed on the inner wall of the pretreatment cylinder 1, one end of the conveying pipe 172 is communicated and fixed on the fixed pipe 173, a plurality of rotating nozzles are installed on the top of the fixed pipe 173, and a conveying water pipe is connected to the conveying pipe 172; when the activated carbon rotates, clean water is input into the conveying pipe 172 through the conveying water pipe, the clean water is input into the fixed pipe 173 through the conveying pipe 172, and then the clean water is sprayed out of the rotating nozzles, the activated carbon plate 17 is backflushed, and the suction pump is turned on at the same time, and the adsorbate and impurities are discharged from the discharge pipe 171; when the filter plate 14 needs to be cleaned, the first rotating rod 125 needs to be lifted upward, the cooperation between the limiting block 127 and the matching block 162 is released, and the discharge hopper 16 and the activated carbon plate 17 do not need to be rotated together.

[0052] As Figure 3 and Figure 7 shown, the inside of the feeding cylinder 11 is provided with spiral blades, the top end of the first rotating rod 125 is fixedly connected with a plurality of partition plates 129, the top of the partition plate 129 is attached to the bottom surface of the feeding cylinder 11, and the bottom end of the feeding cylinder 11 is provided with an electromagnetic valve.

[0053] The separation plate 129 is used for the gap feeding of the feeding cylinder 11 in use, when feeding is needed, the flocculating agent and the coagulant in the feeding cylinder 11 are discharged under the dredging of the spiral blades by opening the electromagnetic valve and the first motor 124, when discharging, the first motor 124 drives the first rotating rod 125 to rotate, the separation plate 129 is driven to rotate by the first rotating rod 125, the separation plate 129 intermittently blocks the feeding cylinder 11, so that the flocculating agent and the coagulant are intermittently discharged, and are fully mixed and stirred with the waste water.

[0054] As shown in Figure 2 and Figure 8 , one side of the pretreatment cylinder 1 is provided with an oxidation cylinder 2, one end of the first liquid discharge pipe 19 is communicated and fixed on the top end side wall of the oxidation cylinder 2, the top of the oxidation cylinder 2 is communicated and fixed with a feeding hopper 24, the top of the oxidation cylinder 2 is fixed with an L-shaped plate 21, the bottom of the L-shaped plate 21 is fixed with a second motor 22, the output shaft of the second motor 22 is fixed with a second rotating rod 23, the second rotating rod 23 is rotatably connected on the oxidation cylinder 2 through a bearing, a plurality of stirring blades are installed on the second rotating rod 23; a second ultraviolet lamp tube 28 is installed on the inner wall of the oxidation cylinder 2.

[0055] The oxidation cylinder 2 is used for catalyzing small molecules in waste water in use, the pretreated waste water is input into the oxidation cylinder 2 through the first liquid discharge pipe 19, then disulfate is added through the feeding hopper 24, the second motor 22 is opened, the second rotating rod 23 is driven to rotate by the second motor 22, the stirring blades are driven to rotate by the second rotating rod 23, the waste water and the disulfate are mixed and stirred by the stirring blades, at the same time, the second ultraviolet lamp tube 28 is opened, and ozone is added, the small molecule pollutants such as urea are removed by deep oxidation through catalysis, the UVC wave band emitted by the second ultraviolet lamp tube 28 can efficiently activate the disulfate to generate strong oxidizing sulfate radicals, at the same time, the ozone is also decomposed to generate more free radicals, the free radicals have a very high oxidation potential, can completely destroy the chemical bonds of small molecule organic matters such as urea, and mineralize them into harmless substances such as CO2, H2O and N2.

[0056] As shown in Figure 9 , the inside of the second rotating rod 23 is embedded and fixed with an air inlet pipe 25, the top end of the air inlet pipe 25 extends to the outside of the second rotating rod 23, and a one-way valve 251 is installed, a plurality of through holes 231 are formed in the second rotating rod 23, a plurality of air outlets are formed in the bottom end of the air inlet pipe 25, and the air outlets are communicated with the through holes 231.

[0057] The air inlet pipe 25 is used for the delivery of ozone in use, the ozone enters the bottom end of the air inlet pipe 25, is output to the bottom of the waste water through the air outlets and the through holes 231 in sequence, and is fully catalyzed.

[0058] As Figure 8 , Figure 9 and Figure 10 shown, the top of the oxidation cylinder 2 is fixed with a second electric push rod 26, the output end of the second electric push rod 26 is fixed with a push plate 261, the side wall of the push plate 261 is fixed with a mounting pipe 262, the mounting pipe 262 is sleeved with a docking pipe 263, the docking pipe 263 is externally connected with an ozone source; the outer wall of the mounting pipe 262 is fixed with a second magnetic block 264, the outer wall of the air inlet pipe 25 is fixed with a first magnetic block 252; the mounting pipe 262 is sleeved with the air inlet pipe 25, and the first magnetic block 252 and the second magnetic block 264 are magnetically attracted.

[0059] The docking pipe 263 provided by the application is used for sleeving in the inside of the air inlet pipe 25 when in use, and the first magnetic block 252 and the second magnetic block 264 are magnetically attracted, so that the docking pipe 263 and the air inlet pipe 25 are installed tightly, the ozone is conveniently input into the air inlet pipe 25 through the docking pipe 263, when the docking pipe 263 is not working, the second electric push rod 26 needs to be opened, the one-way valve 251 needs to be closed, the push plate 261 is driven to move through the output end of the second electric push rod 26, the mounting pipe 262 is driven to move through the push plate 261, the docking pipe 263 is driven to move through the mounting pipe 262, the docking pipe 263 is separated from the air inlet pipe 25, and the first magnetic block 252 and the second magnetic block 264 are no longer attached; so as not to hinder the rotation of the second rotating rod 23.

[0060] As Figure 3 shown, the side of the oxidation cylinder 2 is provided with a reduction cylinder 3, and the bottom of the oxidation cylinder 2 is communicated and fixed to the top side wall of the reduction cylinder 3 through a second liquid discharge pipe 27; the side wall of the reduction cylinder 3 is communicated and fixed with a feed hopper 31; and the top end inner wall of the reduction cylinder 3 is installed with a biological membrane 32.

[0061] The reduction cylinder 3 provided by the application is used for conveying the oxidized wastewater into the reduction cylinder 3 through the second liquid discharge pipe 27, then adsorbing small molecules through the biological membrane 32, so as to remove the urea small molecules.

[0062] As Figure 3 shown, the bottom of the reduction cylinder 3 is installed with a magnetic stirrer 36, the inner wall of the reduction cylinder 3 is fixed with a mounting bracket 33, the mounting bracket 33 is rotatably connected with a third rotating rod 34 through a bearing, and the outer wall of the third rotating rod 34 is fixed with a plurality of stirring paddles 35.

[0063] The stirring paddle 35 is used for the reaction of waste water and reducing agent in use, the reducing agent is added through the feeding hopper 31, the magnetic stirrer 36 is opened, the third rotating rod 34 is driven to rotate through the magnetic stirrer 36, the stirring paddle 35 is driven to rotate through the third rotating rod 34, and the treated waste water and the reducing agent are mixed and stirred through the stirring paddle 35, so that the excess oxidant in the treated waste water is removed, and the influence of the oxidant on subsequent equipment is prevented.

[0064] Working principle: firstly, the reclaimed water is transported into the pretreatment cylinder 1 through the liquid inlet pipe 13; then the flocculant and the coagulant aid are respectively added through the feeding cylinder 11, the flocculant reacts with the waste water to gather suspended solids and colloidal particles into larger flocs, and the coagulant aid is helpful to rapid flocculation and prevents the waste water from flowing to the next process without flocculation within a set time; after flocculation, the control valve at the bottom of the discharge hopper 16 is periodically opened at a fixed time, the flocculated waste water flows to the activated carbon plate 17 through the filter plate 14 and the discharge hopper 16, and the activated carbon plate 17 is used for adsorbing macromolecules; since ozone and peroxymonosulfate need to generate hydroxyl radicals and other strong oxidizing free radicals under the catalysis of ultraviolet, the small-molecule organic matter such as urea is targetedly decomposed; however, if the macromolecular organic matter remains in the reclaimed water, the free radicals are preferentially reacted with the macromolecular organic matter, so that the oxidant is consumed in large amount; the activated carbon adsorption can block this path, avoid the accumulation of by-products, and simplify subsequent advanced treatment; the waste water after removal of the organic matter flows downward to the flow guide plate 18, the top of the flow guide plate 18 is packaged with a plurality of first ultraviolet lamp tubes 181, the flow guide plate 18 is used for slowing down the downward flow speed of the waste water, and the first ultraviolet lamp tubes 181 are used for providing light ultraviolet irradiation in the pretreatment stage, realizing partial degradation of the macromolecular organic matter, reducing turbidity and inhibiting bacteria, and preparing for subsequent advanced oxidation, so that the multistage treatment of water, waste water or sewage in the pretreatment stage is realized.

[0065] The waste water after pretreatment is input into the oxidation cylinder 2 through the first liquid outlet pipe 19, then the disulfate is added through the feeding hopper 24, the second motor 22 is opened, the second rotating rod 23 is driven to rotate through the second motor 22, the stirring blade is driven to rotate through the second rotating rod 23, and the waste water and the disulfate are mixed and stirred through the stirring blade; at the same time, the second ultraviolet lamp tube 28 is opened, and ozone is added for catalysis; the UVC wave band emitted by the second ultraviolet lamp tube 28 can efficiently activate peroxymonosulfate to generate strong oxidizing sulfate radicals; at the same time, the ozone can also decompose to generate more free radicals; these free radicals have extremely high oxidation potential and can completely destroy the chemical bonds of small-molecule organic matter such as urea, so that the small-molecule pollutants such as urea are deeply oxidized and removed.

[0066] The oxidized wastewater is transported into the reduction cylinder 3 through the second discharge pipe 27, and then passes through the biological membrane 32 to adsorb small molecules, thereby removing the urea small molecules. The reducing agent is added through the feeding hopper 31, the magnetic stirrer 36 is started, the third rotating rod 34 is driven to rotate by the magnetic stirrer 36, the stirring paddle 35 is driven to rotate by the third rotating rod 34, and the treated wastewater and the reducing agent are mixed and stirred by the stirring paddle 35, so that the excess oxidizing agent in the treated wastewater is removed, thereby preventing the influence of the oxidizing agent on the subsequent equipment.

[0067] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. Process for the removal of small urea molecules from recycled water for the electronics industry, characterized by: It comprises the following steps: S1: pumping the reclaimed water into the pretreatment tank, adding coagulant and coagulant aid, and making the suspended solids and colloidal particles aggregate into larger flocs; then reducing turbidity by adsorbing organic matter and small particle impurities in water; S2: the filtered wastewater is preliminarily degraded by ultraviolet light to reduce the load of urea, and a pretreated solution is obtained; S3: pumping the pretreated solution into the oxidation tank, and adding ozone and peroxymonosulfate respectively, which synchronously generates hydroxyl radicals, sulfate radicals and superoxide radicals under ultraviolet catalysis, to strengthen the oxidative decomposition of small molecular organic matter such as urea; S4: the catalyzed solution needs to be adsorbed to remove small molecules of urea; S5: finally, the solution is pumped into the reduction tank for deep purification by adding a reducing agent, which is used for multi-stage treatment of water, wastewater or sewage.

2. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 1, characterized in that: The pretreatment tank adopts a pretreatment cylinder (1), the inner wall of the pretreatment cylinder (1) is fixedly connected with a filter plate (14), and the filter plate (14) is provided with a cleaning mechanism; a discharge hopper (16) is rotatably connected to the middle inner wall of the pretreatment cylinder (1) through a bearing, and the bottom of the discharge hopper (16) is fixedly connected with an activated carbon plate (17) through four connecting rods (163); a plurality of guide plates (18) are fixedly connected to the bottom end of the pretreatment cylinder (1), the guide plates (18) are all inclined, and the low end of the guide plates (18) all has a flow gap with the pretreatment cylinder (1); a plurality of first ultraviolet lamp tubes (181) are installed on the guide plates (18); two feeding cylinders (11) are installed on the top of the pretreatment cylinder (1); a liquid inlet pipe (13) is fixedly connected to the top of the pretreatment cylinder (1), and a first liquid outlet pipe (19) is fixedly connected to the bottom of the pretreatment cylinder (1).

3. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 2, characterized in that: The cleaning mechanism comprises a first rotating rod (125), a first motor (124) is installed on the top of the pretreatment cylinder (1) through a lifting mechanism, the first rotating rod (125) is fixedly connected to the output shaft of the first motor (124), a plurality of stirring rods are installed on the first rotating rod (125), and a plurality of arc-shaped plates (126) are slidably installed on the bottom end of the first rotating rod (125) through two limiting rods (128); the bottom of the arc-shaped plate (126) is attached to the top of the filter plate (14); a discharge bin (15) is installed on the side wall of the pretreatment cylinder (1), and the bottom inner wall of the discharge bin (15) is attached to the top of the filter plate (14).

4. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 3, characterized in that: The lifting mechanism comprises a fixing frame (12) fixed to the top of the pretreatment cylinder (1), the top of the fixing frame (12) is fixed with a first electric push rod (121), the output end of the first electric push rod (121) is fixed with a lifting plate (122), the first motor (124) is fixed to the bottom of the lifting plate (122), two vertical rods (123) are fixed between the fixing frame (12) and the pretreatment cylinder (1), and the lifting plate (122) is slidably connected on the two vertical rods (123); the bottom of the first rotating rod (125) is fixed with a limiting block (127), the inner wall of the discharge hopper (16) is fixed with a matching block (162) through a connecting frame (161), and the limiting block (127) is insertedly matched with the matching block (162).

5. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 3, characterized in that: The inside of the feeding cylinder (11) is provided with spiral blades, the top end of the first rotating rod (125) is fixed with a plurality of partition plates (129), and the top of each partition plate (129) is attached to the bottom surface of the feeding cylinder (11); and the bottom end of the feeding cylinder (11) is provided with an electromagnetic valve.

6. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 2, characterized in that: The pretreatment cylinder (1) is provided with an oxidation cylinder (2) on one side, one end of the first liquid discharge pipe (19) is fixedly connected to the top side wall of the oxidation cylinder (2), the top of the oxidation cylinder (2) is fixedly connected with a feeding hopper (24), the top of the oxidation cylinder (2) is fixed with an L-shaped plate (21), the bottom of the L-shaped plate (21) is fixed with a second motor (22), the output shaft of the second motor (22) is fixed with a second rotating rod (23), the second rotating rod (23) is rotatably connected to the oxidation cylinder (2) through a bearing, and a plurality of stirring blades are installed on the second rotating rod (23); and a second ultraviolet lamp tube (28) is attached and installed on the inner wall of the oxidation cylinder (2).

7. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 6, characterized in that: The inside of the second rotating rod (23) is embedded with an air inlet pipe (25), the top end of the air inlet pipe (25) extends to the outside of the second rotating rod (23) and is provided with a one-way valve (251), a plurality of through holes (231) are formed in the second rotating rod (23), and a plurality of air outlets are formed in the bottom end of the air inlet pipe (25) and are in communication with the through holes (231).

8. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 7, characterized in that: The top of the oxidation cylinder (2) is fixed with a second electric push rod (26), the output end of the second electric push rod (26) is fixed with a push plate (261), the side wall of the push plate (261) is fixed with a mounting pipe (262), the mounting pipe (262) is sleeved with a butt joint pipe (263), and the butt joint pipe (263) is externally connected with an ozone source; a second magnetic block (264) is fixed to the outer wall of the mounting pipe (262), a first magnetic block (252) is fixed to the outer wall of the air inlet pipe (25); the mounting pipe (262) and the air inlet pipe (25) are matched and sleeved, and the first magnetic block (252) and the second magnetic block (264) are magnetically attracted.

9. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 6, characterized in that: One side of the oxidation cylinder (2) is provided with a reduction cylinder (3), the bottom of the oxidation cylinder (2) is communicated and fixed on the top end side wall of the reduction cylinder (3) through a second liquid discharge pipe (27); the side wall of the reduction cylinder (3) is communicated and fixed with a feeding hopper (31); the top end inner wall of the reduction cylinder (3) is installed with a biological membrane (32).

10. The process for removal of small molecules of urea from recycled water for the electronic industry according to claim 9, characterized in that: The bottom of the reduction cylinder (3) is installed with a magnetic stirrer (36), the inner wall of the reduction cylinder (3) is fixed with a mounting bracket (33), the mounting bracket (33) is rotatably connected with a third rotating rod (34) through a bearing, and the outer wall of the third rotating rod (34) is fixed with a plurality of stirring paddles (35).

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