Treatment system for fluorine-containing electronic industrial wastewater

Abstract

The utility model discloses a fluorine-containing electronic industrial wastewater treatment system, belongs to the field of wastewater treatment, and solves the problems of unstable effluent quality and secondary pollution of the existing fluorine-containing wastewater treatment method. The system comprises an adjusting tank, a sedimentation tank, an anaerobic sludge blanket reaction tank, a biological treatment tank, a first-stage filter tank, an AOP advanced oxidation tank, a post-sedimentation tank, a second-stage filter tank, a fluorine removal resin device, a disinfection tank and an ecological wetland which are connected in sequence. According to the utility model, fluorine-containing electronic industrial wastewater in industrial production drainage is subjected to targeted treatment, multiple treatment systems such as multi-stage precipitation, multi-stage filtration, biological treatment, resin exchange and the like are combined, the effluent quality is stable, and high-standard discharge or reuse is taken as a target; the device has the advantages of stable and reliable operation, small occupied area, convenience in operation and maintenance, energy conservation, good treatment effect and the like, and secondary pollution is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of wastewater treatment, and in particular relates to a treatment system for fluorine-containing electronic industrial wastewater. Background Art

[0002] Electronic wastewater has different components, and the types and contents of pollutants it contains also vary. They basically contain cyanide, some acidic substances, alkaline substances, and heavy metals such as chromium, copper, nickel, cadmium, zinc, lead, and mercury. The wastewater is mainly composed of grinding wastewater, organic wastewater, fluoride-containing wastewater, and comprehensive wastewater, accounting for 60% to 95% of the wastewater volume.

[0003] In view of the fact that COD in this type of wastewater is difficult to biodegrade and has high treatment and emission standards, it is essential to strengthen the pretreatment before biological treatment, while also ensuring that COD is stably discharged in compliance with emission standards.

[0004] For fluoride-containing wastewater, chemical precipitation, reverse osmosis, ion exchange, co-distillation, electrocoagulation and other methods are currently mainly used for treatment at home and abroad. However, the water quality of the effluent from these treatment methods is unstable and there is a problem of secondary pollution. Utility Model Content

[0005] The utility model aims to provide a treatment system for fluorine-containing electronic industrial wastewater, so as to solve the problems of unstable effluent quality and secondary pollution in the existing fluorine-containing wastewater treatment method.

[0006] The technical scheme of the utility model is: a treatment system for fluorine-containing electronic industrial wastewater, comprising a regulating tank, a sedimentation tank, an anaerobic sludge bed reaction tank, a biological treatment tank, a level I filter, an AOP advanced oxidation tank, a post-sedimentation tank, a level II filter, a fluorine removal resin device, a disinfection tank and an ecological wetland which are connected in sequence.

[0007] As a further improvement of the utility model, an override pipe is provided between the biological treatment tank and the AOP advanced oxidation tank, and an override valve is provided on the override pipe.

[0008] As a further improvement of the utility model, two sedimentation tanks are provided and connected in series.

[0009] As a further improvement of the utility model, the anaerobic sludge bed reaction tank adopts an upflow hydrolysis acidification tank.

[0010] As a further improvement of the utility model, the biological treatment pool is composed of a front-end AO process treatment pool and a rear-end MBR membrane pool connected in series.

[0011] As a further improvement of the utility model, the first-level filter tank adopts an activated carbon filter tank, and the second-level filter tank adopts an aerated biological filter tank.

[0012] As a further improvement of the utility model, the disinfection pool adopts an ultraviolet disinfection pool.

[0013] The beneficial effects of the utility model are as follows: the utility model carries out targeted treatment of fluorine-containing electronic industrial wastewater in industrial production drainage, combines multiple treatment systems such as multi-stage sedimentation, multi-stage filtration, biological treatment, resin exchange, etc., and the effluent water quality is stable, with high-standard discharge or reuse as the goal, and has the advantages of stable and reliable operation, small footprint, convenient operation and maintenance, energy saving and good treatment effect, and no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a process flow chart of the utility model.

[0016] In the figure: 1- regulating tank; 2- sedimentation tank; 3- anaerobic sludge bed reaction tank; 4- biological treatment tank; 41- AO process treatment tank; 42- MBR membrane tank; 5- I-level filter tank; 6- AOP advanced oxidation tank; 7- post-sedimentation tank; 8- II-level filter tank; 9- fluorine removal resin device; 10- disinfection tank; 11- ecological wetland; 12- transcendence pipe. DETAILED DESCRIPTION

[0017] The utility model is described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a treatment system for fluorine-containing electronic industrial wastewater includes a regulating tank 1, a sedimentation tank 2, an anaerobic sludge bed reaction tank 3, a biological treatment tank 4, a first-level filter 5, an AOP advanced oxidation tank 6, a post-sedimentation tank 7, a second-level filter 8, a fluorine removal resin device 9, a disinfection tank 10 and an ecological wetland 11, which are connected in sequence.

[0019] An override pipe 12 is provided between the biological treatment tank 4 and the AOP advanced oxidation tank 6 , and an override valve is provided on the override pipe 12 .

[0020] Two sedimentation tanks 2 are provided and connected in series.

[0021] The anaerobic sludge blanket reaction tank 3 adopts an upflow hydrolysis acidification tank.

[0022] The biological treatment tank 4 is composed of a front AO process treatment tank 41 and a rear MBR membrane tank 42 connected in series. The MBR membrane tank 42 is connected to a flushing pump. When the MBR membrane tank 42 is blocked, the MBR membrane tank 42 is flushed by the flushing pump.

[0023] The first-level filter 5 adopts an activated carbon filter, and the second-level filter 8 adopts an aerated biological filter.

[0024] The disinfection pool 10 adopts an ultraviolet disinfection pool and also has the function of reoxygenation so as to better connect to the back-end ecological wetland 11 for ecological treatment.

[0025] Both the sedimentation tank 2 and the post-sedimentation tank 7 are high-efficiency sedimentation tanks.

[0026] Figure 2 The processing process of the utility model is shown, which is as follows:

[0027] A. Fluorine-containing electronic industrial wastewater first enters regulating tank 1, where the amount and quality of incoming water are adjusted to ensure that the incoming water enters the next level of process evenly;

[0028] B. After being regulated in regulating tank 1, the wastewater enters the two subsequent sedimentation tanks 2 in sequence, and chemical precipitation and coagulation precipitation are carried out in sequence. Through two-stage high-efficiency precipitation, metal ions such as calcium ions and copper ions are mainly removed, part of fluoride is removed, and COD caused by colloids and suspended matter is removed. Cr ;

[0029] C. After the wastewater has been subjected to two high-efficiency sedimentations, it is mixed with the introduced municipal domestic sewage and sent to the anaerobic sludge bed reaction tank 3 (upflow composite hydrolysis acidification tank). Through the hydrolysis of the upflow composite hydrolysis acidification tank, the macromolecular organic matter is degraded into small molecular organic matter, so as to improve the carbon-nitrogen ratio in the influent of the subsequent biological treatment process, promote the acclimatization of microorganisms, and ensure the normal operation of the subsequent biological treatment tank 4;

[0030] D. The wastewater treated in step C is sent to the biological treatment pool 4. The biological treatment pool 4 is composed of an AO process treatment pool 41 and an MBR membrane pool 42. The AO process treatment pool 41 includes an anoxic section (section A), an aerobic section (section O) and a nitrification liquid reflux system. The wastewater passes through the anoxic section (section A), the aerobic section (section O) and the nitrification liquid reflux system in sequence to remove COD in the influent. Cr , SS, ammonia nitrogen, TN and TP and other conventional pollutant indicators. The MBR membrane pool 42 is connected to the AO process treatment pool 41. After the MBR membrane interception effect, the COD in the effluent indicators of the MBR membrane pool 42 is removed. Cr Except for the excessive fluoride, the other indicators meet the relevant emission requirements; in order to improve the removal rate of phosphorus, synchronous chemical phosphorus removal can be used in the MBR membrane pool 42 according to the phosphorus concentration of the influent; and mud and water separation is carried out in the MBR membrane treatment system, which can ensure a high concentration of activated sludge in the biological pool and ensure the effluent water quality;

[0031] E. After the wastewater is treated by biological treatment process, it is oxidized by ozone (O3) and sent to the first-level filter 5. The filter material of the first-level filter 5 is granular activated carbon; the strong oxidant (O3) destroys the original stable structure of organic pollutants and breaks the chain to form easily degradable organic matter, so as to enhance the removal of COD Cr; Activated carbon filter is mainly used to remove COD in emergency situations Cr and pollutants such as petroleum, etc., can be operated through the overriding pipe 12 under normal circumstances;

[0032] F. Send the effluent from the first-stage filter 5 or the effluent from the biological treatment tank 4 (under the condition of overrunning) to the AOP advanced oxidation tank 6, and use the Fenton advanced oxidation process to convert the difficult-to-degrade COD Cr Converted into small molecular organic matter for further processing;

[0033] G. The wastewater treated by the Fenton advanced oxidation process is then sent to the post-sedimentation tank 7, the main function of which is to enhance the removal of fluoride;

[0034] H. Sending the effluent from the post-sedimentation tank 7 to the II-stage filter 8, which is an aerated biological filter, to further enhance the removal of ammonia nitrogen, and further remove the organic matter decomposed by the Fenton advanced oxidation process on the basis of decomposing the refractory organic matter by the Fenton advanced oxidation process;

[0035] I. The wastewater treated by the II-level filter 8 is sent to the fluorine removal resin device 9 for treatment. Finally, the fluoride is reduced to the discharge standard through the exchange of the fluorine removal resin. Finally, after disinfection (reoxygenation) in the disinfection tank 10, it is sent to the artificial ecological wetland 11 for further treatment and reuse or discharge in compliance with the standards.

[0036] The defluorination resin is repeatedly used after being treated in the resin regeneration storage tank, and the regeneration liquid flows back to the regulating tank 1.

Claims

1. A treatment system for fluorine-containing electronic industrial wastewater, characterized in that: The system comprises a regulating tank (1), a sedimentation tank (2), an anaerobic sludge bed reaction tank (3), a biological treatment tank (4), a first-stage filter (5), an AOP advanced oxidation tank (6), a post-sedimentation tank (7), a second-stage filter (8), a fluorine removal resin device (9), a disinfection tank (10) and an ecological wetland (11) which are connected in sequence.

2. A treatment system for fluorine-containing electronic industrial wastewater according to claim 1, characterized in that: An override pipe (12) is provided between the biological treatment tank (4) and the AOP advanced oxidation tank (6), and an override valve is provided on the override pipe (12).

3. A treatment system for fluorine-containing electronic industrial wastewater according to claim 1 or 2, characterized in that: The sedimentation tanks (2) are provided with two and are connected in series.

4. A treatment system for fluorine-containing electronic industrial wastewater according to claim 1 or 2, characterized in that: The anaerobic sludge bed reaction tank (3) adopts an upflow hydrolysis acidification tank.

5. A treatment system for fluorine-containing electronic industrial wastewater according to claim 1 or 2, characterized in that: The biological treatment tank (4) is composed of an AO process treatment tank (41) at the front end and an MBR membrane tank (42) at the rear end connected in series.

6. A treatment system for fluorine-containing electronic industrial wastewater according to claim 1 or 2, characterized in that: The first-level filter (5) is an activated carbon filter, and the second-level filter (8) is an aerated biological filter.

7. A treatment system for fluorine-containing electronic industrial wastewater according to claim 1 or 2, characterized in that: The disinfection pool (10) is an ultraviolet disinfection pool.

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