CN214693615U - System for reducing scaling in softening treatment of reverse osmosis concentrated brine caustic soda/lime soda ash - Google Patents
System for reducing scaling in softening treatment of reverse osmosis concentrated brine caustic soda/lime soda ash Download PDFInfo
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- CN214693615U CN214693615U CN202023128393.4U CN202023128393U CN214693615U CN 214693615 U CN214693615 U CN 214693615U CN 202023128393 U CN202023128393 U CN 202023128393U CN 214693615 U CN214693615 U CN 214693615U
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Abstract
The utility model relates to a reduce reverse osmosis strong brine caustic soda/lime soda ash softening treatment scale deposit system belongs to industrial wastewater treatment technical field, throw with device, mud including dissolving dispensing device, dosing pump, RO dense water installation, mud and throw with pump, one-level reaction tank, second grade reaction tank, tertiary reaction tank, preliminary sedimentation tank, sludge discharge pump, air compressor, storage tank, valve, soda throw with pump, soda throws with device and PAM charge device. The utility model discloses a system for reducing Reverse Osmosis (RO) strong brine caustic soda/lime soda ash softening scale deposit adds the aquatic suspended solid through introducing light sludge and throwing to the multistage chemical softening reaction tank of RO dense water, provides carrier and counter weight for the calcium carbonate crystallization, gets rid of the aquatic hardness, has the lime of throwing to add to remove hard if the front end, then the utility model discloses an aspect can also reduce RO dense water concentration or the lime of evaporative crystallization preliminary treatment and throw the volume, has solved lime soda simultaneously and has removed when hard that the suspended solid is low, the not good scheduling problem of precipitation effect; on the other hand, the problem of scaling of the tank wall and the pipeline equipment is mainly delayed and solved.
Description
Technical Field
The utility model relates to a reduce reverse osmosis strong brine caustic soda/lime soda ash and soften processing scale deposit system belongs to environmental protection water treatment technical field.
Background
The industrial sewage and wastewater has complex components, and besides conventional chemical pollutants, various trace toxic and harmful chemical pollutants and color and odor causing substances also exist. The reverse osmosis system has good removal effect on organic matters, pathogenic microorganisms, nitrate nitrogen and refractory organic matters in the sewage, and is gradually popularized and utilized in the field of sewage recycling. The reverse osmosis system can produce high-quality regenerated water and byproduct RO concentrated water at the same time. The water amount of the RO concentrated water usually accounts for 25-50% of the water inflow, and is determined by the recovery rate of the RO system.
Some sewage treatment projects adopt reverse osmosis concentrated water to further concentrate RO concentrated water through seawater desalination reverse osmosis and brackish water desalination reverse osmosis, so that the reuse rate of sewage is improved, the discharge of concentrated brine is reduced, the concentrated brine subjected to concentration is subjected to evaporation crystallization to realize resource utilization, however, substances such as calcium, magnesium and the like in the concentrated brine can cause scaling of reverse osmosis, an evaporator and the like, and therefore, before RO concentrated water is further concentrated, softening is needed to remove hardness in water.
Hardness is an important water quality indicator and has attracted considerable attention in drinking water and industrial water. Generally, calcium ions and magnesium ions are the main reasons for generating hardness, and the water can be soft water, light hard water, medium hard water and hard water, and the corresponding mass concentration of the calcium ions is 0-17, 17-60, 60-120 and 120-180 mg/L respectively. Excessive hardness in water can cause problems in municipal and industrial water processes.
Common softening and hardness removal methods include a scale inhibitor method, a lime softening method, a lime soda softening method, a coagulating sedimentation method, a zeolite method and an alumina method; for strong brines with high hardness (especially those with high permanent hardness), the caustic/lime-soda softening process is the most economical and has many engineering cases in industrial applications.
The basic principle of softening and removing water by using caustic soda/lime-soda ash is to generate calcium carbonate and magnesium hydroxide precipitates through chemical reaction, and to remove the total hardness of calcium and magnesium in water through precipitation.
MgSO4+2NaOH＝Mg(OH)2↓+Na2SO4
CaCl2+Na2CO3＝CaCO3↓+2NaCl
In recent years, a reverse osmosis strong brine softening treatment process is widely applied in the industry, and a published granted patent CN10592815A discloses a method for crystallizing reverse osmosis membrane strong brine and the like to recycle the strong brine and sulfate, wherein the strong brine is softened.
The CN106186550A patent discloses a sewage zero discharge device and method, pretreating and softening reverse osmosis strong brine, finally evaporating and crystallizing to obtain sulfate, and simultaneously recycling the strong brine to realize zero discharge, wherein the softening part also adopts a caustic soda/lime-soda softening process.
However, in the RO concentrated water further reduction treatment or concentrated water zero discharge process, when the caustic soda/lime soda softening method is used for hardness removal, although the method is economical, has good effect and wide application, the biggest problem is that the scale formation of tank walls, pipelines, stirrers and the like is serious, equipment is damaged, the operation is influenced, meanwhile, sludge deposition pipelines are formed, manual cleaning is needed at regular intervals (1-3 months), adverse effects are brought to operation and maintenance, and the maintenance cost is greatly increased.
Therefore, the technical method and the system for reducing the scale formation in the softening process of the caustic soda/lime-soda ash are provided, so that the softening and hardness removal operation of RO concentrated water is safer and more stable, and the technical problem which needs to be solved urgently in the technical field is solved.
SUMMERY OF THE UTILITY MODEL
One of the objectives of the utility model is to provide a reduce Reverse Osmosis (RO) strong brine caustic soda/lime soda ash softening scale deposit system, throw in the multistage chemical softening reaction tank of RO dense water through introducing light sludge, increase the aquatic suspended solid, provide carrier and counter weight for the calcium carbonate crystallization, get rid of the aquatic hardness, if there is lime added in the front end to remove hard, then the utility model discloses an aspect can also reduce RO dense water concentration or evaporation crystallization preliminary treatment's lime throw volume, solved lime soda simultaneously when removing hard that the suspended solid is low, precipitation effect is not good scheduling problem; on the other hand, the problem of scaling of the tank wall and the pipeline equipment is mainly delayed and solved.
The above object of the utility model is achieved through the following technical scheme:
a system for reducing scale formation in softening treatment of reverse osmosis strong brine caustic soda/lime soda ash comprises a dissolving and dispensing device, a dosing pump, an RO (reverse osmosis) concentrated water device, a sludge dosing pump, a primary reaction tank, a secondary reaction tank, a tertiary reaction tank, a pre-settling tank, a sedimentation tank, a sludge discharge pump, an air compressor, a storage tank, a valve, a soda feeding pump, a soda feeding device and a PAM (polyacrylamide) dosing device; the device comprises a dissolving and dispensing device, a first-stage reaction tank, a RO concentrated water device, a sludge feeding device, a first-stage reaction tank, a second-stage reaction tank, a sedimentation tank, a second-stage reaction tank, a third-stage reaction tank, a pre-sedimentation tank, a sedimentation tank and a control device, wherein the dissolving and dispensing device is connected with the first-stage reaction tank through a chemical feeding pump and a chemical distributing pipeline; the soda feeding device is connected with the secondary reaction tank through a soda feeding pump and a pipeline, the PAM feeding device is connected with the tertiary reaction tank through a pump and a pipeline, the air compressor is connected with the storage tank, and the storage tank is respectively connected with the secondary reaction tank, the tertiary reaction tank and the pre-settling tank through a valve and a gas distribution pipeline.
Preferably, the dissolving and dispensing device comprises a dissolving and dispensing pool, wherein a stirrer is arranged in the dissolving and dispensing pool.
Preferably, the primary reaction tank is provided with a stirrer.
Preferably, the secondary reaction tank is provided with a stirrer.
Preferably, the third-stage reaction tank is provided with a stirrer.
Preferably, the secondary reaction tank is provided with openings at intervals of 10-15cm on the cover, and the openings are uniformly added on the stirring diameter of the stirrer.
Preferably, the feeding pipes of the dissolving and dispensing device are all transversely suspended on the water surface of the reaction tank of the primary reaction tank.
Preferably, the adding pipes of the soda adding device are all horizontally suspended on the water surface of the reaction tank of the secondary reaction tank.
Preferably, the feeding pipes for feeding PAM are all transversely suspended on the water surface of the reaction tank of the third-stage reaction tank.
Preferably, the feeding pipes of the compressed air fed into the second-stage reaction tank, the third-stage reaction tank and the pre-settling tank are stainless steel pipes with the diameter DN 8.
Preferably, the aeration feeding point is positioned 10-20cm away from the bottom of the secondary reaction tank, the tertiary reaction tank and the pre-settling tank.
Preferably, the gas distribution pipeline is provided with 1 feeding point at the interval of 0.3-0.5m in the pre-settling tank, and aeration plug flow is carried out to avoid sludge deposition.
Another objective of the present invention is to provide a method for reducing scaling in the softening treatment of Reverse Osmosis (RO) strong brine lime/caustic soda, which adds suspended solids in water by introducing light sludge into a RO strong brine multistage chemical softening reaction tank, provides a carrier and a counterweight for calcium carbonate crystallization, and removes hardness in water, if lime is added to the front end to remove hardness, the present invention can also reduce the lime adding amount of RO strong brine concentration or evaporation crystallization pretreatment, and solve the problems of low suspended solids, poor precipitation effect, etc. when RO strong brine is softened and removed hardness; on the other hand, the problem of scaling of the tank wall and the pipeline equipment is mainly delayed and solved.
The above object of the utility model is achieved through the following technical scheme:
a method for reducing scaling in softening treatment of Reverse Osmosis (RO) strong brine lime soda ash comprises the following steps:
(1) preparing a hydrated lime solution with the concentration of 1-5% or a caustic soda solution with the concentration of 1-10%, adding the hydrated lime solution or the caustic soda solution into a first-stage softening tank (a first-stage reaction tank) through a dosing pump, and raising the pH value of RO concentrated water to 9.5-11, wherein the optimal pH range is usually 10-10.5;
(2) preparing a soda solution with the concentration of 3-10%, adding a proper amount of soda solution, and feeding the soda solution into a second-stage reaction tank (a reaction tank of the second-stage reaction tank), wherein the specific adding amount is calculated by the calcium hardness of the RO concentrated water to be removed, and usually 0.5-1.2 times of the calcium hardness (in molar weight) is taken;
(3) preparing 0.1-0.4% Polyacrylamide (PAM), and adding into a reaction tank of a third-stage reaction tank;
(4) adding returned light sludge into a reaction tank of a primary reaction tank through a sludge adding device, wherein the concentration of the returned light sludge is 1-2% (the water content is 98-99%);
(5) aeration pipes are added in the overflow area (the second-stage reaction tank), the stirring dead area (the third-stage reaction tank) and the pre-settling tank for aeration, so as to prevent sludge deposition.
Preferably, in the steps (1) and (2), the caustic soda/lime-soda ash is added at multiple points, so that the uniform and rapid mixing of the added chemicals is ensured.
Preferably, in the step (1), the lime/caustic soda is added in a multipoint way and is uniformly added on the water inlet section of the first-stage reaction zone (first-stage reaction tank).
Preferably, in the step (2), the soda ash is added by a tubular drilling method, openings are formed at intervals of 10-15cm, and the soda ash is uniformly added on the stirring diameter of the stirrer.
Preferably, in the step (1), the step (2) and the step (3), the adding pipes are respectively suspended on the water surfaces of the reaction tanks of the first-stage reaction tank, the second-stage reaction tank and the third-stage reaction tank in a transversely-arranged mode and are not in direct contact with the RO concentrated water during adding.
Preferably, in the step (5), the compressed air is added into the secondary reaction tank, the tertiary reaction tank and the pre-settling tank through storage tanks, and the adding pipes of the secondary reaction tank, the tertiary reaction tank and the pre-settling tank are stainless steel pipes with the diameter DN 8.
Preferably, in the step (5), the aeration feeding point is positioned 10-20cm away from the bottom of the secondary reaction tank, the tertiary reaction tank and the pre-settling tank.
Preferably, in the step (5), 1 feeding point is arranged on the compressed air pipe at the interval of 0.3-0.5m in the pre-sedimentation tank, and the sludge sedimentation is avoided by aeration plug flow.
Preferably, in the step (1), the TDS of the RO concentrated water in the RO concentrated water device is 12000mg/L at 2000-.
Has the advantages that:
the utility model discloses a system and method for reducing Reverse Osmosis (RO) strong brine lime/soda ash softening scale deposit, through introducing light mud and throwing to the multistage chemical softening reaction pond of RO dense water and increasing the suspended solid in the aquatic, provide carrier and counter weight for the calcium carbonate crystallization, get rid of the aquatic hardness, if the front end has throwing lime to remove hard, then the utility model discloses an aspect can also reduce RO dense water concentration or evaporation crystallization preliminary treatment's lime throw volume, and the suspended solid is low when having solved lime soda simultaneously and removing hard, and the precipitation effect scheduling problem not good; on the other hand, the problem of scaling of the tank wall and the pipeline equipment is mainly delayed and solved.
The invention is further illustrated by the accompanying drawings and the detailed description, which are not meant to limit the scope of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a system for reducing scale in the softening treatment of Reverse Osmosis (RO) strong brine lime and soda ash of the present invention.
Description of the main reference numerals:
1 dissolve dispensing device 2 dosing pumps
3 RO dense water device 4 sludge feeding device
5 sludge feeding pump 6 first-stage reaction tank
7 soda adding device 8 second-stage reaction tank
9 three-stage reaction tank 10 pre-settling tank
11 sedimentation tank 12 sludge discharge pump
13 air compressor 14 storage tank
15 valve 16 soda adding pump
17 PAM charge device
Detailed Description
The components and the like in the following embodiments are, unless otherwise specified, conventional ones, and unless otherwise specified, all the components and the like used in the present invention are commercially available. Unless otherwise specified, the concentrations in the following examples are given in weight percent.
Example 1
As shown in fig. 1, it is a schematic structural diagram of a system for reducing scale formation in the softening treatment of Reverse Osmosis (RO) concentrated brine lime soda ash of the present invention; wherein, 1 is a dissolving and dispensing device, 2 is a dosing pump, 3 is an RO concentrated water device, 4 is a sludge feeding device, 5 is a sludge feeding pump, 6 is a primary reaction tank, 7 is a soda feeding device, 8 is a secondary reaction tank, 9 is a tertiary reaction tank, 10 is a pre-settling tank, 11 is a settling tank, 12 is a sludge discharge pump, 13 is an air compressor, 14 is a storage tank, 15 is a valve, 16 is a soda feeding pump, and 17 is a PAM dosing device; the utility model discloses a reduce Reverse Osmosis (RO) strong brine lime soda softening scale deposit system includes dissolving medicine dispensing device 1, dosing pump 2, RO dense water installation 3, mud feeder 4, mud throw with pump 5, first order reaction tank 6, soda feeder 7, second order reaction tank 8, tertiary reaction tank 9, preliminary sedimentation tank 10, sedimentation tank 11, mud delivery pump 12, air compressor 13, storage tank 14, valve 15, soda throw with pump 16, PAM dosing device 17; the device for dissolving and dispensing the drug 1 is connected with a first-stage reaction tank 6 through a drug pump 2 and a drug distribution pipeline, an RO concentrated water device 3 is connected with the first-stage reaction tank 6 through a water inlet pump (not marked in the figure) and a water distribution pipeline, a sludge feeding device 4 is connected with the first-stage reaction tank 6 through a sludge feeding pump 5 and a sludge distribution pipeline, the first-stage reaction tank 6 is connected with a second-stage reaction tank 8 through a tank top overflow, the second-stage reaction tank 8 is adjacent to the third-stage reaction tank 9 and is communicated through an adjacent wall middle pipeline, a PAM drug feeding device 17 is positioned above the third-stage reaction tank 9, the third-stage reaction tank 9 is communicated with a pre-settling tank 10 through an opening in the middle of the adjacent wall, the pre-settling tank 10 is adjacent to a settling tank 11, an overflow weir is arranged in the middle, the settling tank 11 discharges sludge outwards through a sludge discharge pump 12, and the sludge is concentrated and filter-pressed; the soda adding device 7 is connected with the secondary reaction tank 8 through a soda adding pump 16 and a pipeline, the air compressor 13 is connected with the storage tank 14, and the storage tank 14 is respectively connected with the secondary reaction tank 8, the tertiary reaction tank 9 and the pre-settling tank 10 through a valve 15 and a gas distribution pipeline; dissolve dispensing device 1 including dissolving the dispensing pond, wherein be equipped with the agitator, one-level reaction tank 6 includes one-level chemical reaction pond, wherein is equipped with the agitator, and second grade reaction tank 8 includes second grade chemical reaction pond, wherein is equipped with the agitator, and tertiary reaction tank 9 includes tertiary chemical reaction pond, wherein is equipped with the agitator.
Wherein, the adding pipes of the dissolving and dispensing device 1 and the soda adding device 7 are horizontally suspended on the water surfaces of the reaction tanks of the primary reaction tank 6 and the secondary reaction tank 8; and the feeding pipe of the PAM feeding device 17 is suspended on the water surface of the reaction tank of the third-stage reaction tank 9.
Wherein, the feeding pipes of the storage tank 14, the second-stage reaction tank 8, the third-stage reaction tank 9 and the pre-settling tank 10 are stainless steel pipes with the diameter DN 8; the aeration feeding point (namely an air distribution pipeline or an aeration pipe) is positioned 10-20cm away from the bottom of the secondary reaction tank 8, the tertiary reaction tank 9 and the pre-settling tank 10.
The utility model discloses a reduce Reverse Osmosis (RO) strong brine lime soda ash and soften processing scale deposit system: RO dense water is put into pump, medicine dispensing tank through mud through water pump, sludge tank and is connected with multistage reaction tank through pipelines such as lime dosing pump, all is equipped with the valve on the pipeline, steerable regulating pondage, mud volume and dosing etc. and mud after the reaction discharges to concentrated pond through the dredge pump, and the part also can flow back first order reaction tank reuse.
The sludge feeding device adopts newly precipitated light sludge which can be provided by a front end regulating tank or a sedimentation tank, and sludge with the concentration of 1-2% is stirred and uniformly mixed by a stirrer and then pumped into the front end of a first-stage reaction area of the multistage reaction tank to be mixed and reacted with RO concentrated water and lime/caustic soda liquid medicine; the total solid concentration of the first-stage reaction zone after adding lime and sludge is 1-1.5 g/L.
The amount of sludge added into the first reaction tank is about 8-15% of the total water inlet flow, a valve is arranged on the pipeline to adjust and control the flow, and a cleaning water gap is reserved for flushing the pipeline.
And blowing air to the second and third reaction tanks and the preliminary sedimentation tank of the multistage reaction tank through a compressed air branch pipe by using 0.2-0.5MPa of compressed air, wherein the aeration flow rate is 0.5-2 m/s.
And finally, the sludge is precipitated in a sedimentation tank and discharged through a sludge discharge pump, and the turbidity of the discharged water is less than 5 NTU.
The utility model discloses a reduce Reverse Osmosis (RO) strong brine lime/caustic soda ash and soften the characteristics of handling scale deposit system and include: the multistage reaction tank and the dispensing tank are both provided with stirring equipment; the sludge feeding device adopts a screw pump or a slurry centrifugal pump, the sludge is pumped into the first reaction tank, and the feeding point is positioned below the water surface at the front end of the first reaction tank; lime is added at multiple points through a medicine distribution pipeline after being dissolved.
The utility model discloses a reduce Reverse Osmosis (RO) strong brine lime/caustic soda ash softening treatment scale deposit method, include following step:
(1) preparing a hydrated lime solution with the concentration of 1-5% or a caustic soda solution with the concentration of 1-10%, adding the hydrated lime solution or the caustic soda solution into a first-stage softening tank (a first-stage reaction tank 6) through a dosing pump, and raising the pH value of RO concentrated water to 9.5-11, wherein the optimal pH range is usually 10-10.5;
(2) preparing a soda solution with the concentration of 3-10%, adding a proper amount of soda solution into a second-stage reaction tank (a second-stage reaction tank 8) through a soda adding device 7, wherein the specific adding amount is calculated according to the calcium hardness of the RO concentrated water to be removed, and is usually calculated according to the calcium hardness (in molar quantity) of 0.5-1.2 times;
(3) preparing 0.1-0.4% Polyacrylamide (PAM), and adding the PAM into a third-stage reaction tank (a third-stage reaction tank 9) through a PAM dosing device 17;
(4) adding returned light sludge into a reaction tank of a primary reaction tank 6 through a sludge adding device 4, wherein the concentration is 1-2% (the water content is 98-99%);
(5) the caustic soda/lime-soda ash is added at multiple points, so that the uniform and rapid mixing of the added chemicals is ensured;
(6) aeration pipes are added in the overflowing area (the second-stage reaction tank 8), the stirring dead area (the third-stage reaction tank 9) and the pre-settling tank for aeration, so that sludge deposition is prevented.
Wherein, the soda is added by a tubular drilling, openings are arranged at intervals of 10-15cm (the openings are arranged on the cover of the secondary reaction tank 8 at intervals), and are uniformly added on the stirring diameter of the stirrer; the lime/caustic soda is added in a multipoint way and is uniformly added on the water inlet section of a first-stage reaction zone (a first-stage reaction tank 6); the adding pipes (dosing pipes) are horizontally suspended on the water surfaces of the reaction tanks of the first-stage reaction tank 6, the second-stage reaction tank 8 and the third-stage reaction tank 9 and are not in direct contact with RO concentrated water during dosing; compressed air is fed into the feeding pipes of the second-stage reaction tank 8, the third-stage reaction tank 9 and the pre-settling tank 10 through the storage tank 14, the feeding pipes are stainless steel pipes with the diameter DN8, and the aeration feeding points are positioned at the positions 10-20cm away from the bottoms of the second-stage reaction tank 8, the third-stage reaction tank 9 and the pre-settling tank 10; 1 feeding point is arranged on the compressed air pipe at intervals of 0.3-0.5m in the pre-settling tank 10, and sludge sedimentation is avoided by aeration plug flow; the TDS of the RO concentrated water in the RO concentrated water device 3 is 2000-12000mg/L, and the total hardness is 1000-4000 mg/L; calcium hardness is 500-2000 mg/l.
The utility model discloses an introduce light mud, increase the suspended solid of the dense water of RO, for the calcium carbonate crystallization provides carrier and counter weight, avoid overflowing department at pipeline, agitator etc. and appear the scale deposit, the siltation blocks up the pipeline, damages agitated vessel etc..
Application example 1
A certain iron and steel plant, it carries out furthest's processing retrieval and utilization to synthesize waste water of sewage treatment plant in to the factory, divide into the preliminary treatment unit (high-efficient sedimentation tank + V type filtering pond), advanced treatment unit (ultrafiltration reverse osmosis) to and strong brine unit, wherein strong brine unit carries out further concentrated decrement to the thick water of RO, adopts traditional lime-soda softening process to soften the thick water of RO and removes hard, the following problem appears in the operation process: the scale formation is serious, the sedimentation tank is often blocked, and the stirrer is damaged due to scale formation, so that the tank body needs to be cleaned after about 1 month of operation.
Specific data are shown in table 1 below:
TABLE 1 conventional apparatus and Process
The problems are as follows: the whole winter operation condition is that the first reaction tank and the soda addition reaction tank are seriously scaled, the blade of the stirrer is seriously scaled (the thickness is about 10cm), the eccentric swing is large during the operation, the variable speed motor leaks oil, the aeration stirring is used instead of the stirring when the stirring is stopped, the operation lasts for about 1 month, the tank wall is about 15-20cm scaled, the overflow pipe is also scaled and blocked, the multistage reaction tank cannot operate, and a large amount of sludge is deposited in a pre-precipitation area and a flocculation area during drainage inspection.
Reform transform this technology, adopt the utility model discloses a system and method that reduces Reverse Osmosis (RO) strong brine lime soda ash softening scale deposit produces the operation, and the result is as following table 2:
TABLE 2 systems and methods of the present invention
After the sludge in the front-end efficient sedimentation tank is introduced, the operation lasts for about 3 months, only a thin layer of scale is formed on the wall of the tank, and only a thin layer (1-3mm) of scale is formed on the hanging piece of the soda tank after 3 months. The method has the advantages that the sludge in the efficient sedimentation tank with the pretreated front end is introduced, the pH value of the lime tank is increased by 10.0-10.5, and the ideal effect is obtained after the soda is added with the chemicals, so that the scaling of the multistage reaction tank is greatly delayed, the water quality of the effluent is also guaranteed, the sludge sedimentation problem is solved by introducing aeration, the sedimentation tank is changed from the original 1-month shutdown cleaning maintenance into 1-year 1 maintenance, the operation period is prolonged, and the stability of the production operation is guaranteed.
Application example 2
Certain industry garden sewage treatment plant, adopt high-efficient sedimentation tank + V type filtering pond + ultrafiltration + reverse osmosis process to carry out the advanced treatment retrieval and utilization to the interior waste water of garden, the thick water of RO gets into the strong brine unit and carries out further concentration decrement, adopt traditional caustic soda-soda softening process to soften the unhardened to the thick water of RO, the pencil that adds appears in the operation process, the agitator, the pool wall scale deposit is serious, soda reaction tank is often stifled, the agitator damages scheduling problem because of the scale deposit, about 30 ~ 50 days of continuous operation need clear up the cell body promptly, sedimentation zone effect is not good simultaneously, the floc is lighter.
Specific data are shown in table 3 below:
TABLE 3 conventional apparatus and Process
The problems are as follows: the operation condition in the whole autumn and winter is that the scale of the soda feeding reaction tank is serious, the operation lasts for about 40 days, the wall of the tank has about 15-20cm scale, the overflow pipe is also scaled and blocked, the strong brine softening reaction tank cannot operate, and simultaneously the effluent turbidity
Reform transform this technology, adopt the utility model discloses a system and method that reduces Reverse Osmosis (RO) strong brine lime/caustic soda ash softening treatment scale deposit produce the operation, and the result is as following table 4:
table 4 the system and method of the present invention
By adopting the utility model, the sludge in the front-end high-efficiency sedimentation tank runs for about 3 months, only a thin layer of scale is on the tank wall, and only a thin layer of scale (1-3mm) is on the sodium carbonate tank hanging piece for 3 months. The efficient sedimentation tank sludge pre-treated at the front end is introduced, the pH value of the first reaction tank is increased to 10.5, the good effect is obtained after the chemical addition of the soda ash is improved, the scaling of the soda ash softening reaction tank is delayed, the problem of poor sedimentation effect of the sedimentation tank is solved, the aeration (deposition prevention) is introduced into the flocculation area, the sedimentation tank is stopped for cleaning and maintenance within 30-40 days, the maintenance is changed into the maintenance within 8-10 months, and the stable production of the system is ensured.
The utility model discloses a reduce device that Reverse Osmosis (RO) strong brine lime/caustic soda ash softened and handled the scale deposit, throw with equipment such as feeder apparatus, multistage reaction tank, charge device and aeration equipment including mud. The utility model discloses longer to operating duration, pond wall pipeline and agitator etc. receive the scale deposit to influence serious water treatment process facility, have fine reduction scale deposit trend effect.
The utility model discloses a system and method for reducing Reverse Osmosis (RO) strong brine lime/caustic soda ash softening scale formation can add front end light sludge to the RO concentrated water multistage chemical softening reaction tank for hardness removal, if the front end has lime added for hardness removal, then the utility model discloses an aspect can also reduce RO concentrated water concentration or evaporation crystallization pretreatment lime adding amount, has solved RO concentrated water and has softened the low suspended solid when removing hardness simultaneously, precipitation effect scheduling problem not good; on the other hand, the problem of scaling of the tank wall and the pipeline equipment is mainly delayed and solved.
The above description is only the specific implementation manner of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the design of the present invention within the technical scope of the present invention.
Claims (6)
1. The utility model provides a reduce reverse osmosis strong brine caustic soda/lime soda ash and soften processing scale deposit system which characterized in that: comprises a dissolving and dispensing device, a dosing pump, an RO concentrated water device, a sludge dosing pump, a primary reaction tank, a secondary reaction tank, a tertiary reaction tank, a pre-settling tank, a sedimentation tank, a sludge discharge pump, an air compressor, a storage tank, a valve, a soda dosing pump, a soda dosing device and a PAM dosing device; the device comprises a dissolving and dispensing device, a first-stage reaction tank, a RO concentrated water device, a sludge feeding device, a first-stage reaction tank, a second-stage reaction tank, a sedimentation tank, a second-stage reaction tank, a third-stage reaction tank, a pre-sedimentation tank, a sedimentation tank and a control device, wherein the dissolving and dispensing device is connected with the first-stage reaction tank through a chemical feeding pump and a chemical distributing pipeline; the system comprises a soda feeding device, a PAM feeding device, an air compressor, a storage tank, a valve, a gas distribution pipeline, a secondary reaction tank, a tertiary reaction tank and a pre-settling tank, wherein the soda feeding device is connected with the secondary reaction tank through a soda feeding pump and the pipeline; the dissolving and dispensing device comprises a dissolving and dispensing pool, wherein a stirrer is arranged in the dissolving and dispensing pool; the primary reaction tank is provided with a stirrer; the secondary reaction tank is provided with a stirrer; and the third-stage reaction tank is provided with a stirrer.
2. The system for reducing scaling in a reverse osmosis concentrated brine caustic soda/lime soda softening process of claim 1, wherein: holes are formed in the cover of the secondary reaction tank at intervals, and the interval between the holes is 10-15 cm.
3. The system for reducing scaling in a reverse osmosis concentrated brine caustic soda/lime soda softening process of claim 2, wherein: the feeding pipes of the dissolving and dispensing device, the soda feeding device and the PAM feeding device are respectively suspended on the water surfaces of the reaction tanks of the first-stage reaction tank, the second-stage reaction tank and the third-stage reaction tank in a horizontal mode.
4. The system for reducing scaling in a reverse osmosis concentrated brine caustic soda/lime soda softening process of claim 3, wherein: and the feeding pipes of the storage tank, the second-stage reaction tank, the third-stage reaction tank and the pre-settling tank are stainless steel pipes with the diameter DN 8.
5. The system for reducing scaling in a reverse osmosis concentrated brine caustic soda/lime soda softening process of claim 4, wherein: the gas distribution pipeline is positioned 10-20cm away from the bottoms of the second-stage reaction tank, the third-stage reaction tank and the pre-settling tank.
6. The system for reducing scaling in a reverse osmosis concentrated brine caustic soda/lime soda softening process of claim 5, wherein: the gas distribution pipeline is provided with 1 feeding point at the interval of 0.3-0.5m in the pre-settling tank.
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| CN202023128393.4U CN214693615U (en) | 2020-12-23 | 2020-12-23 | System for reducing scaling in softening treatment of reverse osmosis concentrated brine caustic soda/lime soda ash |
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| CN202023128393.4U CN214693615U (en) | 2020-12-23 | 2020-12-23 | System for reducing scaling in softening treatment of reverse osmosis concentrated brine caustic soda/lime soda ash |
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