CN213738939U - Sewage treatment device capable of controlling product crystal size - Google Patents
Sewage treatment device capable of controlling product crystal size Download PDFInfo
- Publication number
- CN213738939U CN213738939U CN202022380421.5U CN202022380421U CN213738939U CN 213738939 U CN213738939 U CN 213738939U CN 202022380421 U CN202022380421 U CN 202022380421U CN 213738939 U CN213738939 U CN 213738939U
- Authority
- CN
- China
- Prior art keywords
- fluidized bed
- reflux
- zone
- bed main
- main part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
The utility model relates to a can control sewage treatment plant of product crystal size, a serial communication port, sewage treatment plant includes fluidized bed main part and reflux unit, the fluidized bed main part is equipped with settling zone, transition district and fluidization district by last to being equipped with in proper order down, reflux unit passes through the telescopic back flow and is connected with the fluidized bed main part, the one end of back flow is equipped with the backward flow mouth, and the position of backward flow mouth can change in the fluidized bed main part to the granularity of control crystal product. Through control the position of the return flow mouth in the fluidized bed main part combines the product granularity demand, adjusts the return flow depth of insertion, can regulate and control final product granularity in a flexible way, improves the product rate of recovery simultaneously.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment and resourceization, concretely relates to can control sewage treatment plant of product grain size.
Background
The fluidized bed crystallization is a common technology for wastewater treatment and recycling, and compared with the traditional stirring type reactor, the fluidized bed can realize continuous wastewater treatment and intermittent discharge of crystallized products, has good pollutant removal effect and strong impact resistance, and the obtained products have low water content, large granularity and low impurity content. Meanwhile, the system is easy to control automatically, and is widely concerned in the fields of pollutant removal and recovery (such as phosphorus recovery and fluorine removal), drinking water softening (calcium removal) and the like.
However, the existing fluidized bed crystallization technology generally has the problems of low recovery rate of crystal products, entrainment of water outlet microcrystals and the like. In order to prevent the influence of the microcrystals in the effluent of the fluidized bed on the effluent quality and subsequent treatment facilities, a settling tank or a solid-liquid separator is usually added at the rear end of the fluidized bed to improve the interception of the microcrystals by the system. In Chinese utility model patent CN103935974B, a method for recovering high-concentration ammonia nitrogen in sewage into high-purity large-granule struvite is disclosed, wherein a secondary sedimentation tank is additionally arranged behind a three-section type conical fluidized bed; the struvite production device disclosed in the chinese utility model CN201809171U also adopts a settling tank to intercept microcrystals carried by the fluidized bed effluent. The peripheral arrangement of the precipitation facilities inevitably prolongs the treatment process and increases the occupied area, and simultaneously, microcrystals intercepted by the precipitation facilities need to be additionally collected and treated, thereby increasing the operation and maintenance cost of the treatment system.
In addition, researchers have attempted to functionally compartmentalize the crystallization reactor by adding internals and directly trap the crystallites in the system by internal circulation. The device for removing phosphate in wastewater by a struvite particle crystallization method disclosed in Chinese utility model patent CN104529027B adopts a multi-cylinder nested design, and an impeller is arranged in the device to provide a driving force for internal circulation; similarly, chinese utility model patent CN104129769B provides a compact struvite recovery unit with high efficiency and low consumption, and it realizes the functional partition to add the internals as well, and flow the crystal mixture back to the bottom of the unit to realize the internal circulation. Although the internal circulation avoids the loss of microcrystals and saves subsequent precipitation, the existing internal circulation equipment cannot realize granulation of crystallized products, and is complex in design and high in operation management difficulty.
In summary, the above two conventional methods cannot simultaneously achieve the recovery of the crystallized product and the artificial control of the product granularity in a simple and efficient manner.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the high efficiency of the unable synchronous realization crystal dams and miniaturation among the current fluidized bed crystallization technology is overcome. The utility model provides a simple and easy, can improve the sewage treatment plant of crystallization product rate of recovery and control product granularity in step based on crystallization dynamics and hydrodynamics principle.
The utility model provides a can control product crystal grain size's sewage treatment plant, sewage treatment plant includes fluidized bed main part and reflux unit, the fluidized bed main part is equipped with settling zone, transition district and fluidization district by last to being equipped with in proper order down, reflux unit passes through the telescopic back flow and is connected with the fluidized bed main part, the one end of back flow is equipped with the backward flow mouth, and the position of backward flow mouth can change in the fluidized bed main part to the granularity of control crystal product.
The fluidized bed main part is equipped with sedimentation zone, transition district and fluidization region by last under to in proper order, the top in fluidization region links to each other with the transition district, the top in transition district links to each other with the sedimentation zone, the top in sedimentation zone is equipped with the overflow weir.
The bottom of fluidization region is equipped with discharge gate and at least one feed inlet, the feed inlet is located the top of discharge gate. Sewage enters from the bottom of the fluidized bed main body, water flows out from an overflow weir at the top after crystallization treatment, and inorganic particles formed by crystallization are discharged from the discharge hole.
Preferably, the fluidizing zone is provided with a plurality of feed ports and is evenly distributed around the circumference of the bottom of the fluidizing zone.
The pipe diameter ratio of the settling zone to the fluidizing zone is (3-5):1, the height ratio of the settling zone, the transition zone and the fluidizing zone is 1: (0.8-2): 1-4), the transition zone is connected between the settling zone and the fluidizing zone, and the axial cross section of the transition zone is in a trapezoid shape with a large top and a small bottom.
Reflux unit includes backward flow mouth, telescopic back flow and backwash pump, the one end of back flow is connected the bottom in fluidization region, the other end are equipped with the backward flow mouth, and follow the fluidized bed main part is inserted at the top in settling zone, the backwash pump is connected in the back flow for partly backward flow the settling zone or transition zone provide power for the feed liquid with fluidization region.
The retractable return pipe is capable of adjusting the position of the return port in the fluidized bed body, preferably, the position of the return port varies from the overflow liquid level at the top of the settling zone to the bottom of the transition zone, and more preferably, the position of the return port varies from 1/20-1/5 below the overflow liquid level at the top of the settling zone to the middle of the transition zone.
The backflow port is in a horn mouth shape, the included angle between the bottom opening and the horizontal plane is 30-45 degrees, and the opening radius is 1/4-1/2 of the radius of the settling zone.
The length adjusting mode of the telescopic backflow pipe is selected from hard connection or soft connection, preferably, the hard connection is PVC pipe movable connection, and the soft connection is metal hose or PVC corrugated pipe movable connection. Of course, other movable connection modes can be selected, and the invention does not limit the mode.
Preferably, the return pipe is provided with a pipeline filter for filtering small crystals entering the return pipe, so that the granulation speed of the product can be accelerated, and the particle size of the final product can be improved.
The reflux pump is a diaphragm pump or an impeller centrifugal pump, preferably, the reflux pump is a diaphragm pump, so that the crushing effect of hydraulic shearing on the tiny crystal aggregates entering the reflux pipe can be reduced, the granulation rate of the product is accelerated, and the granularity of the final product is improved.
The sewage treatment device also comprises a dosing box which is connected with the fluidized bed main body through a dosing pipe. The dosing pipe is inserted into the fluidized bed main body from one side of the settling zone through the dosing pump.
The utility model discloses still provide sewage treatment plant's application method can realize improving crystallization product rate of recovery and control product granularity in step, the method includes following step:
(1) the backflow port is arranged in the middle of the transition region by adjusting the insertion depth of the backflow pipe in the fluidized bed main body;
(2) inputting sewage into the fluidized bed main body from the feeding hole, and starting the reflux pump and the dosing pump to prepare microcrystals;
(3) after reacting for a period of time, adjusting the insertion depth of the reflux pipe, and placing the reflux port at a proper position in the fluidized bed main body;
(4) and opening the discharge hole to obtain a granular crystalline product.
The sewage in the step (2) is used as a raw material, the inorganic matter concentration range of the target crystal is 50-2000 mg/L, the pollutant concentration range is wide, and the method is suitable for various sewage treatment systems.
Preferably, in the step (3), the reflux port is lifted to a position 1/20-1/5 away from the overflow liquid level at the top of the settling zone by adjusting the insertion depth of the reflux pipe.
The sewage treatment device is suitable for various crystallization systems, such as struvite crystallization, calcium fluoride crystallization, calcium carbonate crystallization and calcium phosphate crystallization.
Compared with the prior art, the utility model has the following technical advantages:
(1) the space-time regulation of the granularity of the crystallized product is realized by adjusting the height of the reflux opening: preparing seed crystal in time, and then completing granulation; spatially effecting nucleation at the bottom of the fluidized bed, crystal growth and coalescence at the upper middle part of the fluidized bed, optionally, breaking in said return pipe;
(2) the fluidized bed main body can realize full product interception, and a sedimentation tank is not required to be additionally arranged subsequently;
(3) aiming at the established crystallization fluidized bed, the reflux device of the utility model can be additionally arranged in the existing fluidized bed, the structure of the original fluidized bed is not required to be changed, and the reconstruction cost is low;
(4) the whole device has simple structure and small maintenance and operation difficulty.
Drawings
Fig. 1 is a schematic structural view of the sewage treatment device according to the embodiment of the present invention.
In the drawing, 1-a fluidizing zone; 2-a transition zone; 3-a precipitation zone; 4, an overflow weir; 5-a return pipe; 6-a reflux port; 7-reflux pump; 8-double union ball valve; 9-a discharge hole; 10-the feed inlet.
Detailed Description
Example 1
The embodiment provides a sewage treatment plant that can control product crystal size, as shown in fig. 1, sewage treatment plant includes fluidized bed main part, reflux unit, and the fluidized bed main part is equipped with settling zone 3, transition zone 2 and fluidization region 1 by last to down in proper order, and reflux unit passes through telescopic back flow 5 and is connected with the fluidized bed main part, and the one end of back flow is equipped with backward flow mouth 6, and the position of backward flow mouth can change in the fluidized bed main part to the granularity of control crystal product.
The utility model discloses a to reflux unit's improvement, highly variable back flow 5 is creatively provided to crystal growth law and fluid flow characteristics in the make full use of fluidized bed main part, adjusts the granularity of crystal product in the sewage promptly through the high position of the backward flow mouth 6 that changes the back flow bottom in the fluidized bed. Crystal nucleation occurs mainly at the bottom of the fluidized bed, while crystal growth and coalescence are mainly located at the upper part of the fluidized bed, and the reflux liquid carries part of the microcrystals and flows back to the precipitation zone or transition zone of the fluidized bed to mix and interact with the part of growing and coalescence crystals, so as to change the final product granularity.
The top end of the fluidization area 1 is connected with the transition area 2, the top end of the transition area 2 is connected with the sedimentation area 3, and the top of the sedimentation area is provided with an overflow weir 4.
The bottom of the fluidization region is provided with a discharge port 9 and four feed ports 10, and the feed ports are positioned above the discharge port. Sewage enters from the bottom of the fluidized bed main body, water flows out from the overflow weir 4 at the top after crystallization treatment, and inorganic particles formed by crystallization are discharged from the discharge hole 9.
The pipe diameter ratio of the settling zone to the fluidizing zone is 3:1, the height ratio of the settling zone to the transition zone to the fluidizing zone is 1:0.8:1, the transition zone is connected between the settling zone and the fluidizing zone, and the axial cross section of the transition zone is in a trapezoid shape with a large top and a small bottom. Specifically, the fluidized bed treatment load was designed to be 12m3D, the pipe diameter of the fluidization area is 0.6m, the height of the fluidization area is 1.2m, the height of the transition area is 0.96m, and the pipe diameter of the sedimentation area is 1.8m and the height of the sedimentation area is 1.2 m.
Reflux unit includes backward flow mouth 6, telescopic back flow pipe 5 and backwash pump 7, and the bottom of fluidization district 1 is connected to the one end of back flow, and the other end is equipped with backward flow mouth 6 to insert the fluidized bed main part from the top of settling zone 3, the backwash pump is connected in the back flow pipe for with the feed liquid part reflux of fluidization district settling zone or transition region provide power, back flow 5 front portion be equipped with two by make ball valve 8.
The telescopic return pipe 5 allows to adjust the position of the return port in the fluidized bed body, preferably in a range between the overflow level at the top of the settling zone and the bottom of the transition zone.
The return port 6 is in a horn mouth shape, the included angle between the bottom opening and the horizontal plane is 45 degrees, and the opening radius is 1/4 of the radius of the settling zone.
The telescopic backflow pipe is movably connected with the PVC pipe in a length adjusting mode.
The reflux pipe is provided with a pipeline filter for filtering small crystals entering the reflux pipe, so that the granulation speed of the product can be accelerated, and the granularity of the final product can be improved.
The reflux pump is a diaphragm pump, which can reduce the crushing effect of hydraulic shearing on the tiny crystal aggregates entering the reflux pipe, accelerate the granulation speed of the product and improve the granularity of the final product.
The inventors have found that the extremely high concentration in the feed zone of the fluidising zone 1 inevitably leads to nucleation of crystallites, a phenomenon which is particularly pronounced in the treatment of high-concentration waste water. As the crystallization reaction proceeds, the degree of supersaturation within the fluidized bed decreases with increasing axial height, with lower degrees of supersaturation contributing to crystal growth and coalescence, with crystal nucleation occurring primarily at the bottom of the fluidized bed and crystal growth and coalescence being primarily in the upper portion of the fluidized bed. According to the nucleation, growth and coalescence phenomena of the crystals and the requirement of the product granularity, the insertion depth of the return pipe 5 is adjusted, the granularity of the final product can be flexibly regulated and controlled, and the product recovery rate is improved.
The sewage treatment device also comprises a dosing box which is connected with the fluidized bed main body through a dosing pipe. The dosing pipe is inserted into the fluidized bed main body from one side of the settling zone through the dosing pump.
The embodiment provides a use method of the sewage treatment device, which comprises the following steps:
(1) the backflow port is arranged in the middle of the transition region by adjusting the insertion depth of the backflow pipe in the fluidized bed main body;
(2) inputting production wastewater for treating the wood activated carbon from the feed inlet to the fluidized bed main body, wherein the concentration of phosphate in the wastewater is 1500mg/L, starting the reflux pump and the dosing pump, placing a dosing port in a fluidization area, preparing microcrystals, and operating parameters: the pH value is 8.5, the ascending flow rate of a fluidization region is 0.02m/s, the flow rate of a sedimentation region is 0.002m/s, a nitrogen source and a magnesium source are added, ammonium chloride or ammonia water is used as the nitrogen source, magnesium chloride, magnesium sulfate or bittern is used as the magnesium source, the N/P ratio is 1.0, the Mg/P ratio is 1.5, and the reflux ratio is 30;
(3) after 4 hours of reaction, the insertion depth of the return pipe is adjusted, the return port is lifted to a position 1/20 away from the top overflow liquid level, and the struvite product is completely intercepted during the operation period;
(4) setting the discharge period to be 4 days, and opening the discharge hole to obtain a struvite product.
The struvite obtained by the method has uniform granularity, and the mass percentage of particles with the particle size of 1.0-1.5mm is up to 95%.
Example 2
This example provides a wastewater treatment plant capable of controlling product crystal size, the pipe diameter ratio of the settling zone to the fluidizing zone is 5:1, the height ratio of the settling zone, the transition zone and the fluidizing zone is 1:2:4, and specifically, the fluidized bed treatment load is designed to be 50m3D, the pipe diameter of the fluidization area is 0.6m, the height of the fluidization area is 4.0m, the height of the transition area is 2.0m, and the pipe diameter of the sedimentation area is 3m and the height of the sedimentation area is 1.0 m.
The reflux pump is an impeller centrifugal pump. The telescopic return pipe 5 can adjust the position of the return port in the fluidized bed main body, and the position of the return port can be changed from 1/20-1/5 below the overflow liquid level at the top of the settling zone to the middle of the transition zone.
The return port 6 is in a horn mouth shape, the included angle between the bottom opening and the horizontal plane is 30 degrees, and the opening radius is 1/2 of the radius of the settling zone.
The other structure of the sewage treatment apparatus of this embodiment is the same as that of embodiment 1.
The embodiment provides a use method of the sewage treatment device, which comprises the following steps:
(1) the backflow port is arranged in the middle of the transition region by adjusting the insertion depth of the backflow pipe in the fluidized bed main body;
(2) follow the feed inlet to the fluidized bed main part input is handled beasts and birds and is bred waste water, and phosphate concentration is 100mg/L in the waste water, starts backwash pump and dosing pump, four branch pipes evenly set up in the high within range in fluidization region, and the dose of throwing is the same, preparation micrite, operating parameter: the pH value is 8.5, the ascending flow rate of a fluidization region is 0.04m/s, the flow rate of a sedimentation region is 0.002m/s, a nitrogen source and a magnesium source are added, ammonium chloride or ammonia water is used as the nitrogen source, magnesium chloride, magnesium sulfate or bittern is used as the magnesium source, the N/P ratio is 1.0, the Mg/P ratio is 1.5, and the reflux ratio is 20;
(3) after 24 hours of reaction, adjusting the insertion depth of the return pipe, lifting the return port to a position 1/5 away from the top overflow liquid level, and completely intercepting the struvite product during the operation period;
(4) setting the discharge period to be 10 days, and opening the discharge hole to obtain a struvite product.
The struvite obtained by the method has uniform granularity, and the mass percentage of particles with the particle size of 2.8-3.2mm is up to 85%.
Claims (9)
1. The utility model provides a can control product crystal size's sewage treatment plant, its characterized in that, sewage treatment plant includes fluidized bed main part and reflux unit, the fluidized bed main part is equipped with settling zone, transition district and fluidization region by last to being equipped with in proper order down, reflux unit passes through the telescopic back flow and is connected with the fluidized bed main part, the one end of back flow is equipped with the backward flow mouth, and the position of backward flow mouth can change in the fluidized bed main part to the granularity of control crystal product.
2. The wastewater treatment apparatus according to claim 1, wherein the reflux device comprises a reflux port, a retractable reflux pipe and a reflux pump, one end of the reflux pipe is connected with the bottom end of the fluidization region, the other end of the reflux pipe is provided with the reflux port, the reflux pump is inserted into the fluidized bed body from the top of the settling region, and the reflux pump is connected in the reflux pipe.
3. The wastewater treatment device of claim 2, wherein the return port is in the shape of a bell mouth, the angle between the bottom opening and the horizontal plane is 30-45 degrees, and the opening radius is 1/4-1/2 of the radius of the settling zone.
4. The wastewater treatment device according to claim 1, wherein the top end of the fluidization region is connected with a transition region, the top end of the transition region is connected with a sedimentation region, and the top of the sedimentation region is provided with an overflow weir.
5. The wastewater treatment device according to claim 4, wherein the bottom of the fluidization region is provided with a discharge port and at least one feed port, and the feed port is positioned above the discharge port.
6. The wastewater treatment device according to claim 5, wherein the pipe diameter ratio of the settling zone to the fluidizing zone is (3-5):1, and the transition zone is connected between the settling zone and the fluidizing zone and has a trapezoidal axial cross section with a large upper part and a small lower part.
7. The wastewater treatment device according to claim 6, wherein the height ratio of the settling zone, the transition zone and the fluidization zone is 1 (0.8-2) to (1-4).
8. The wastewater treatment plant of claim 2, wherein the position of the return port varies from 1/20-1/5 below the overflow level at the top of the settling zone to the middle of the transition zone.
9. The sewage treatment apparatus according to claim 1, further comprising a dosing tank connected to the fluidized bed main body through a dosing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022380421.5U CN213738939U (en) | 2020-10-23 | 2020-10-23 | Sewage treatment device capable of controlling product crystal size |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022380421.5U CN213738939U (en) | 2020-10-23 | 2020-10-23 | Sewage treatment device capable of controlling product crystal size |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213738939U true CN213738939U (en) | 2021-07-20 |
Family
ID=76852253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022380421.5U Active CN213738939U (en) | 2020-10-23 | 2020-10-23 | Sewage treatment device capable of controlling product crystal size |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213738939U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022083376A1 (en) * | 2020-10-23 | 2022-04-28 | 中国科学院城市环境研究所 | Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method |
-
2020
- 2020-10-23 CN CN202022380421.5U patent/CN213738939U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022083376A1 (en) * | 2020-10-23 | 2022-04-28 | 中国科学院城市环境研究所 | Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method |
| US11629077B2 (en) | 2020-10-23 | 2023-04-18 | Institute Of Urban Environment, Chinese Academy Of Sciences | Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2829113C (en) | Reactor for precipitating solutes from wastewater and associated methods | |
| EP3009408B1 (en) | Pulse wastewater injection and mixing device and wastewater injection method for anaerobic reactors | |
| CN103935974B (en) | A kind of method that sewage middle and high concentration ammonia nitrogen is recovered as high-purity big particle guanite | |
| CN112266062B (en) | Sewage treatment device and sewage treatment method capable of controlling product crystal size | |
| CN104129769B (en) | A kind of efficient low-consume compact type struvite retrieving arrangement | |
| CN102963970A (en) | Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage | |
| CN207632576U (en) | Multistage sloping plate coagulative precipitation device | |
| CN209242807U (en) | A kind of struvite crystallization method dephosphorizing reactor | |
| CN213950922U (en) | Continuous flowing water treatment reaction device for efficiently culturing aerobic granular sludge | |
| CN106512465A (en) | Integrated circulating fluidized bed for sewage nitrogen and phosphorus recycling | |
| CN106430506B (en) | Struvite fluidization crystallization device | |
| CN115340204B (en) | Continuous production type defluorination system based on fluidized bed | |
| CN213738939U (en) | Sewage treatment device capable of controlling product crystal size | |
| CN104529027B (en) | Guanite grain crystalline method removes the device of phosphate in waste water | |
| CN110550747B (en) | Method and device for removing hardness of high-hardness water | |
| CN206375714U (en) | A kind of guanite fluidized crystallization device | |
| CN204369629U (en) | A kind of particle phosphorus retrieving arrangement of Internal Circulating Fluidized Bed | |
| CN114671422A (en) | Method for preparing struvite by inducing low-concentration nitrogen and phosphorus in residual sludge supernatant through coconut shell charcoal | |
| CN106904791A (en) | A kind of monosodium glutamate wastewater treatment apparatus and method | |
| CN118289990B (en) | Device and method for recycling high-purity granular struvite from corn starch wastewater | |
| CN115403141B (en) | Method for rapidly culturing anaerobic ammonia oxidation granular sludge | |
| CN208814897U (en) | A kind of device of sludge water hot filtrate recycling phosphate fertilizer | |
| CN210974185U (en) | Advanced phosphorus removal and phosphorus recovery device for secondary effluent of sewage treatment plant | |
| CN218076524U (en) | Waste water recovery system based on MAP deposits method | |
| CN107522285B (en) | Aerobic activated sludge granulation device and method for treating high-concentration ammonia-nitrogen wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |