CN211847497U

CN211847497U - Fluoride waste water treatment system

Info

Publication number: CN211847497U
Application number: CN202020336758.3U
Authority: CN
Inventors: 张亚明; 杨汉军; 黄文凤; 向迎洪; 雷成; 章慧; 唐彤; 赵君科; 孙冬; 蒲柳; 郑庆生
Original assignee: Sichuan Entech Environment Technology Co ltd
Current assignee: Sichuan Entech Environment Technology Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-11-03
Anticipated expiration: 2030-03-17

Abstract

The utility model discloses a fluoride waste water treatment system, processing system include module parts such as pH regulating part, one-level reaction portion, one-level precipitate, second grade reaction portion, second grade precipitate and filter house, and second grade reaction portion and second grade precipitate are similar basically with one-level reaction portion and one-level precipitate structure and function. This practicality utilizes step processing mode to guarantee that the fluorinion and all the other suspended pollutants in the sewage are by abundant desorption through setting up coincident reaction portion and precipitation portion, processing system simple structure in this practicality, the processing water yield is big, the treatment cost is low, and defluorination ability reinforce can effectively solve the problem that the system among the prior art can not effectively remove fluorinion in the sewage.

Description

Fluoride waste water treatment system

Technical Field

The utility model belongs to the technical field of sewage treatment, concretely relates to fluoride waste water treatment system.

Background

Fluorine is an active non-metallic element with extreme properties, and mainly exists in the forms of fluorite, cryolite and calcium fluorophosphate in nature. The fluorine-containing wastewater is used as common industrial wastewater, relates to a plurality of chemical fields such as solar energy, semiconductors, coal chemical industry, pharmacy and the like, and causes increasingly serious environmental pollution due to discharge. Fluorine-containing wastewater is extremely harmful to human bodies, and poisoning can occur during inhalation, so that the metabolism of human substances is influenced, and then various organs of the human bodies are damaged, and finally death is caused.

At present, the methods for treating fluorine-containing industrial wastewater at home and abroad include a chemical precipitation method, a coagulation sedimentation method, an adsorption method, an electrocoagulation method, a reverse osmosis method, an ion exchange method, an electrodialysis method, a membrane separation method and the like. WhileChemical precipitation, flocculation precipitation and adsorption are mainly used industrially. The chemical precipitation method is based on the principle that CaF is generated by adding calcium-containing compounds such as lime, calcium chloride and the like to react with fluoride₂The fluoride ion is removed in a precipitation form, and the method has the disadvantages that a large amount of calcium salt is required, the sludge yield is increased, the defluorination effect is poor, the fluorine content in the treated wastewater is still kept above 20.0mg/L, and the national discharge standard is difficult to achieve. The principle of the flocculation precipitation method is to form a series of polymers through precipitation hydrolysis-flocculation reaction, and finally remove fluorine-containing colloids and suspended particles in wastewater in a flocculent precipitation mode. Meanwhile, the method has the advantages of high treatment cost, large dosage, more interference factors for removal effect, unstable effluent quality, incomplete fluorine removal and potential safety hazard because the water also contains dissolved fluorine-containing complex.

In conclusion, it is necessary to develop a novel fluorine-containing wastewater advanced treatment device with low cost, large scale and ultra-clean discharge.

SUMMERY OF THE UTILITY MODEL

To the above prior art, the utility model provides a fluoride waste water treatment system to the equipment that solves among the prior art can not the problem of deep treatment get rid of aquatic fluorinion.

In order to achieve the above purpose, the utility model adopts the technical scheme that: providing a fluorine-containing wastewater treatment system, which comprises a pH adjusting part, a primary reaction part, a primary precipitation part, a secondary reaction part, a secondary precipitation part and a filtering part; wherein:

the pH adjusting part comprises a pH adjusting tank and a pH adjusting reagent storage tank, and the pH adjusting reagent storage tank is connected with the pH adjusting tank;

the first-stage reaction part comprises a first reaction tank and a first storage tank connected with the first reaction tank, an inlet of the first reaction tank is connected with an outlet of the pH adjusting tank, and a calcium salt solution is stored in the first storage tank;

the primary sedimentation part comprises a first PAC contact tank, a first PAM contact tank and a first sedimentation tank which are connected in sequence, wherein the inlet of the first PAC contact tank is connected with the outlet of the first reaction tank, and the first PAC contact tank and the first PAM contact tank are respectively connected with a PAC storage tank and a PAM storage tank; the upper end and the lower end of the side wall of the first sedimentation tank are respectively provided with a water outlet and a sludge discharge port;

the second-stage reaction part comprises a second reaction tank and a second storage tank connected with the second reaction tank, the second reaction tank is connected with the water outlet of the first sedimentation tank, and a defluorination agent is stored in the second storage tank;

the secondary sedimentation part comprises a second PAC contact tank, a second PAM contact tank and a second sedimentation tank which are connected in sequence, wherein the inlet of the second PAC contact tank is connected with the outlet of the second reaction tank, and the second PAC contact tank and the second PAM contact tank are respectively connected with a PAC storage tank and a PAM storage tank; the upper end and the lower end of the side wall of the second sedimentation tank are respectively provided with a water outlet and a sludge discharge port;

the filtering part comprises a temporary sludge storage tank and a sludge treatment device; the side wall upper end in the pond is kept in to mud is provided with into mud mouth and outlet, and the lower extreme is provided with the mud mouth, and the mud mouth of first sedimentation tank and second sedimentation tank is connected with the mud mouth that advances in the pond is kept in to mud, and sludge treatment device is connected with the mud mouth of the pond is kept in to mud, and the outlet in the pond is kept in to mud and sludge treatment device's delivery port are connected with the pH equalizing basin through the circulating pipe.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, be provided with the online detector of pH in the pH adjusting tank, be provided with online fluorine ion probe in first reaction tank and the second reaction tank, the export of pH adjusting reagent storage tank, first storage tank, second storage tank, PAC storage tank and PAM storage tank all is provided with solenoid valve, pH online detector, fluorine ion probe and solenoid valve and PLC controller communication connection.

Further, two cavities are formed in the pH adjusting reagent storage tank, and an acidic adjusting agent and an alkaline adjusting agent are stored in the cavities respectively; the two cavities are connected with a pH adjusting tank through a pipeline provided with an electromagnetic valve.

Further, the sludge treatment device is a plate-and-frame filter press, a belt filter press, a horizontal screw centrifuge, a stacked screw dehydrator or a vacuum belt dehydrator.

Further, the bottom of the pH adjusting tank, the first reaction tank, the first PAC contact tank, the first PAM contact tank, the second reaction tank, the second PAC contact tank and the second PAM contact tank is provided with a stirring paddle.

The utility model has the advantages that:

1. the system in the utility model is provided with two sets of reaction portions and the precipitate portion that the step was handled, and first order reaction portion and precipitate portion guarantee that the fluorine content in the waste water reduces to 8 ~ 10mg/L, and the fluorine ion content that the second grade reaction portion can guarantee in the sewage falls to 1mg/L and below, and other suspended pollutants are fully desorption simultaneously, and the sewage after the process of the utility model discloses the system handles can reach "drinking water health standard" (GB 5749-2006).

2. The working process of the treatment system in the utility model is controlled by the controller, so that the treatment efficiency and the treatment precision of the sewage are greatly improved.

3. The utility model provides a sludge treatment device among the processing system can extrude the moisture that contains in mud and make it get into processing system and carry out circulation treatment, and mud then stores and transports with the form of filter cake.

Drawings

FIG. 1 is a schematic view showing the connection relationship between the components of the present invention;

FIG. 2 is a schematic diagram of the connection of the on-line detection component to the controller;

wherein, 1, a pH adjusting tank; 2. a pH adjusting reagent storage tank; 3. a first reaction tank; 4. a first storage tank; 5. a first PAC contact cell; 6. a PAC storage tank; 7. a first PAM contact tank; 8. a PAM storage tank; 9. a first sedimentation tank; 10. a second reaction tank; 11. a second storage tank; 12. a second PAC contact cell; 13. a second PAM contact tank; 14. a second sedimentation tank; 15. a sludge temporary storage tank; 16. a sludge treatment device; 17. a circulation pipe; 18. a PLC controller; 19. a pH on-line detector; 20. an online fluoride ion probe; 21. an electromagnetic valve.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

The embodiment of the utility model provides an in, as shown in fig. 1 ~ 2, provide a fluoride waste water treatment system, the processing system in the utility model includes pH regulation portion, one-level reaction portion, one-level precipitation portion, second grade reaction portion, second grade precipitation portion and filter house. The structure and connection relationship of each module part are shown in fig. 1, and specifically as follows:

the pH adjusting part comprises a pH adjusting tank 1 and a pH adjusting reagent storage tank 2, and a water inlet of the pH adjusting tank 1 is connected with a sewage source. The pH adjusting reagent storage tank 2 is filled with a pH adjusting reagent which is communicated with the pH adjusting tank 1 through a pipeline with a valve; and fluorine-containing sewage's a great variety, its pH value is acid mostly, but also has some fluorine-containing sewage to be alkaline, in order to can both adjust the sewage of different pH values, pH adjusting reagent storage tank 2 in the utility model is inside to be provided with two cavitys, stores respectively in these two cavitys acidic conditioning agent (hydrochloric acid solution etc. of suitable concentration) and alkaline conditioning agent (sodium hydroxide solution etc. of suitable concentration) to two cavitys are all connected with pH equalizing basin 1 through the pipeline that is provided with the valve. In addition, in order to accurately detect the pH value of the sewage entering the pH adjusting tank 1, a pH online detector 19 is arranged on the inner wall of the pH adjusting tank 1, and the pH online detector 19 is a common pH detection probe in the prior art, such as an MIK-PH 3.0 type pH online detector and the like; moreover, in order to precisely adjust the pH value of the sewage, the addition amount of the pH adjusting agent should be controlled, so in the present invention, the valve disposed on the pipeline connecting the pH adjusting agent storage tank 2 and the pH adjusting tank 1 is preferably an electromagnetic valve 21, and the electromagnetic valve 21 and the pH online detector 19 are both in communication connection with the external PLC controller 18, the pH online detector 19 transmits the detected pH value of the sewage to the PLC controller 18, and the PLC controller 18 controls the opening and closing of the electromagnetic valve 21 to add the appropriate amount of the pH adjusting agent.

The first-stage reaction part comprises a first reaction tank 3 and a first storage tank 4 connected with the first reaction tank 3, and an inlet of the first reaction tank 3 is connected with an outlet of the pH adjusting tank 1. A calcium salt solution is stored in the first storage tank 4, the solutes of the calcium salt solution are calcium hydroxide and calcium chloride, and the mass concentration ratio of the calcium hydroxide to the calcium chloride in the solution is 1.5: 0.5; the calcium salt solution enters the first reaction tank 3 and then is mixed with sewageThe fluoride ions react to generate calcium fluoride precipitate, so as to achieve the purpose of primarily removing the fluoride ions in the sewage. The first storage tank 4 is communicated with the first reaction tank 3 through a pipeline provided with a valve; in order to accurately detect the content of fluorine ions in the sewage entering the first reaction tank 3, an online fluorine ion probe 20 is arranged on the inner wall of the first reaction tank 3, and the online fluorine ion probe 20 is a common fluorine ion detection probe in the prior art, such as a PF2085 type online fluorine ion probe; in addition, in order to control the addition amount of the calcium salt solution, the valve arranged on the pipeline connecting the first storage tank 4 and the first reaction tank 3 is preferably an electromagnetic valve 21, the electromagnetic valve 21 and the online fluorine ion probe 20 are both in communication connection with an external PLC 18, the online fluorine ion probe 20 transmits the detected fluorine ion content value of the sewage to the PLC 18, and the PLC 18 controls the opening and closing of the electromagnetic valve 21 to add an appropriate amount of the calcium salt solution, so that Ca in the sewage is added²⁺And F^-The content of (A) is about 1:1, so that the fluorine ions in the sewage are removed to the maximum extent.

The primary settling part comprises a first PAC contact tank 5, a first PAM contact tank 7 and a first settling tank 9 which are connected in sequence. The inlet of the first PAC contact tank 5 is connected with the outlet of the first reaction tank 3, and the first PAC contact tank 5 and the first PAM contact tank 7 are respectively connected with a PAC storage tank 6 and a PAM storage tank 8 through pipelines provided with valves. The sewage after the primary defluorination in the first reaction tank 3 enters a first PAC contact tank 5, a PAC storage tank 6 mixes a flocculating agent PAC into the sewage, then the sewage enters a first PAM contact tank 7, and a PAM storage tank 8 mixes a flocculating agent PAM into the sewage. Also, in order to control the amount of flocculant to be added, the valves on the piping connecting the PAC storage tank 6 and the PAM storage tank 8 to the first PAC contact tank 5 and the first PAM contact tank 7 are preferably solenoid valves 21, and the solenoid valves 21 are also communicatively connected to the PLC controller 18. After the flocculant is added, the sewage enters a first sedimentation tank 9 for sedimentation. The upper end of the side wall of the first sedimentation tank 9 is provided with a water inlet and a water outlet respectively, the lower end of the side wall is provided with a sludge discharge port, the water inlet of the first sedimentation tank 9 is connected with the water outlet of the first PAM contact tank 7, the water outlet is connected with a subsequent cleaning component, and the sludge discharge port is connected with a sludge temporary storage tank 15.

A secondary reaction part and a secondary sedimentation part are arranged at the downstream of the first sedimentation tank 9. The second-stage reaction part comprises a second reaction tank 10 and a second storage tank 11 connected with the second reaction tank 10, and the second reaction tank 10 is connected with a water outlet of the first sedimentation tank 9 through a pipeline provided with a valve. The second reservoir 11 stores a defluorination agent, which may be a new agent capable of precipitating fluoride ions, as in the case of the agent stored in the first reservoir 4. The inner wall of the second reaction tank 10 is also provided with an online fluorine ion probe 20, and the second storage tank 11 and the second reaction tank 10 are connected in the same way as the first storage tank 4 and the first reaction tank 3. The secondary sedimentation part comprises a second PAC contact tank 12, a second PAM contact tank 13 and a second sedimentation tank 14 which are connected in sequence; the inlet of the second PAC contact tank 12 is connected with the outlet of the second reaction tank 10, and the second PAC contact tank 12 and the second PAM contact tank 13 are respectively connected with a PAC storage tank and a PAM storage tank through pipelines provided with electromagnetic valves 21. The upper end of the side wall of the second sedimentation tank 14 is respectively provided with a water inlet and a water outlet, and the lower end is provided with a sludge discharge port; the water inlet of the second sedimentation tank 14 is connected with the water outlet of the second PAM contact tank 13, the water outlet is used for discharging the treated water reaching the standard, and the sludge discharge port is connected with the sludge temporary storage tank 15.

The filtering part comprises a sludge temporary storage tank 15 and a sludge treatment device 16. The upper end of the side wall of the sludge temporary storage pool 15 is provided with a sludge inlet and a water outlet, and the lower end is provided with a sludge outlet; the sludge discharge ports of the first sedimentation tank 9 and the second sedimentation tank 14 are connected with the sludge inlet of the temporary sludge storage tank 15 through a pipeline provided with a sludge pump, and the sludge treatment device 16 is connected with the sludge discharge port of the temporary sludge storage tank 15. The sludge temporary storage tank 15 is used for storing sludge from the first sedimentation tank 9 and the second sedimentation tank 14, the sludge is further kept still and precipitated in the sludge temporary storage tank 15, the precipitated upper-layer sewage is discharged from the water outlet, the water outlet of the sludge temporary storage tank 15 is connected with the pH adjusting tank through the circulating pipe 17, and the supernatant liquid after the sludge is kept still and precipitated enters the treatment system for retreatment. The sludge treatment device 16 is used for treating sludge, and the sludge is convenient to store and transport after being treated by the sludge treatment device 16, so that secondary pollution to the environment is avoided; in the invention, the sludge treatment device 16 is preferably a filter press, the sludge discharge port of the temporary sludge storage tank 15 is connected with the inlet of the filter press, the sewage contained in the sludge after filter pressing is pressed out, the pressed water is connected with the pH adjusting tank through the circulating pipe 17, and the part of the sewage enters the treatment system for treatment again.

In the utility model discloses an in the system, for making the reagent that adds more even with sewage mixture, can set up the stirring part in corresponding position, if be provided with the stirring rake in the bottom of pH equalizing basin 1, first reaction tank 3, first PAC contact tank 5, first PAM contact tank 7, second reaction tank 10, second PAC contact tank 12 and second PAM contact tank 13, the stirring rake is driven by the peripheral hardware motor.

The utility model provides a processing system is at the during operation, and sewage gets into pH equalizing basin 1 from the import of pH equalizing basin 1, and pH on-line measuring appearance 19 detects the pH value of sewage and gives PLC controller 18, and PLC controller 18 is according to the switching of testing result control pH adjusting reagent storage tank 2, puts into pH equalizing basin 1 with the pH adjusting reagent of suitable volume to adjust the pH value of sewage to suitable scope. Then sewage enters the first reaction tank 3, the concentration of the fluorine ions in the sewage is detected by the online fluorine ion probe 20, the result is transmitted to the PLC 18, the PLC 18 controls the opening and closing of the first storage tank 4 according to the detection result, and calcium salt solution with proper dosage is put into the first reaction tank 3 so as to achieve the purpose of primary fluorine removal. Then the sewage enters a first PAC contact tank 5 and a first PAM contact tank 7 in sequence, and flocculating agents PAC and PAM are mixed into the sewage; then the sewage mixed with the flocculating agent enters a first sedimentation tank 9 for flocculation sedimentation. After the flocculation and precipitation, the upper layer sewage flows into the second-stage reaction part to continue the subsequent treatment, and the lower layer bottom sludge enters the sludge temporary storage tank 15 through the sludge discharge port to be subjected to further flocculation and precipitation. The process flow of the secondary reaction part and the secondary precipitation part is similar to that of the primary reaction part and the primary precipitation part. After the treatment of the second-stage reaction part and the second-stage sedimentation part, the sewage reaches the discharge standard, the water reaching the standard is discharged through a water outlet of the second sedimentation tank 14, and the bottom sludge in the second sedimentation tank 14 enters the temporary sludge storage tank 15 for further standing sedimentation. Supernatant liquor after sludge precipitation in the sludge temporary storage tank 15 returns to the pH adjusting tank 1 through a circulating pipe 17 for continuous treatment, and bottom sludge enters a sludge treatment device 16 for further treatment. The sludge treatment device 16 is used for squeezing the sludge, the moisture contained in the sludge is squeezed out, the part of water is directly from the sludge, and the fluorine content can not reach the standard and is discharged, so that the water needs to be further treated, in the utility model, the water outlet of the sludge treatment device 16 is connected with the pH adjusting tank 1 through the circulating pipe 17, namely, after the sludge is treated by the sludge treatment device 16, the moisture in the sludge returns to the treatment system to be continuously treated until the treatment standard is reached. The solid of the sludge processed by the sludge processing device 16 is pressed into filter cakes, which is convenient for outsourcing processing.

While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims

1. The utility model provides a fluoride waste water treatment system which characterized in that: comprises a pH adjusting part, a first-stage reaction part, a first-stage precipitation part, a second-stage reaction part, a second-stage precipitation part and a filtering part; wherein:

the pH adjusting part comprises a pH adjusting tank (1) and a pH adjusting reagent storage tank (2), and the pH adjusting reagent storage tank (2) is connected with the pH adjusting tank (1);

the primary reaction part comprises a first reaction tank (3) and a first storage tank (4) connected with the first reaction tank (3), the inlet of the first reaction tank (3) is connected with the outlet of the pH adjusting tank (1), and a calcium salt solution is stored in the first storage tank (4);

the primary sedimentation part comprises a first PAC contact tank (5), a first PAM contact tank (7) and a first sedimentation tank (9) which are connected in sequence, wherein the inlet of the first PAC contact tank (5) is connected with the outlet of the first reaction tank (3), and the first PAC contact tank (5) and the first PAM contact tank (7) are respectively connected with a PAC storage tank (6) and a PAM storage tank (8); the upper end and the lower end of the side wall of the first sedimentation tank (9) are respectively provided with a water outlet and a sludge discharge port;

the secondary reaction part comprises a second reaction tank (10) and a second storage tank (11) connected with the second reaction tank (10), the second reaction tank (10) is connected with a water outlet of the first sedimentation tank (9), and a defluorination agent is stored in the second storage tank (11);

the secondary sedimentation part comprises a second PAC contact tank (12), a second PAM contact tank (13) and a second sedimentation tank (14) which are connected in sequence, wherein the inlet of the second PAC contact tank (12) is connected with the outlet of the second reaction tank (10), and the second PAC contact tank (12) and the second PAM contact tank (13) are respectively connected with the PAC storage tank (6) and the PAM storage tank (8); the upper end and the lower end of the side wall of the second sedimentation tank (14) are respectively provided with a water outlet and a sludge discharge port;

the filtering part comprises a temporary sludge storage tank (15) and a sludge treatment device (16); the lateral wall upper end of mud pond (15) of keeping in is provided with into mud mouth and outlet, and the lower extreme is provided with the mud discharging mouth, the mud discharging mouth of first sedimentation tank (9) and second sedimentation tank (14) with the mud feeding mouth of pond (15) is kept in to mud is connected, sludge treatment device (16) with the mud discharging mouth of pond (15) is kept in to mud is connected, the outlet of pond (15) is kept in to mud and the delivery port of sludge treatment device (16) pass through circulating pipe (17) with pH equalizing basin (1) is connected.

2. The fluorine-containing wastewater treatment system according to claim 1, wherein: be provided with online detector of pH (19) in pH equalizing basin (1), be provided with online fluorine ion probe (20) in first reaction tank (3) and second reaction tank (10), the export of pH adjusting reagent storage tank (2), first storage tank (4), second storage tank (11), PAC storage tank (6) and PAM storage tank (8) all is provided with solenoid valve (21), online detector of pH (19), online fluorine ion probe (20) and solenoid valve (21) and PLC controller (18) communication connection.

3. The fluorine-containing wastewater treatment system according to claim 2, characterized in that: the pH adjusting reagent storage tank (2) is internally provided with two cavities which respectively store an acidic adjusting agent and an alkaline adjusting agent; the two cavities are connected with the pH adjusting tank (1) through a pipeline provided with an electromagnetic valve (21).

4. The fluorine-containing wastewater treatment system according to claim 1, wherein: the sludge treatment device (16) is a plate-and-frame filter press, a belt filter press, a horizontal screw centrifuge, a stacked screw dehydrator or a vacuum belt dehydrator.

5. The fluorine-containing wastewater treatment system according to claim 1, wherein: and stirring paddles are arranged at the bottoms of the pH adjusting tank (1), the first reaction tank (3), the first PAC contact tank (5), the first PAM contact tank (7), the second reaction tank (10), the second PAC contact tank (12) and the second PAM contact tank (13).