Integrated fluorine-containing wastewater treatment system

Abstract

The utility model discloses an integrated fluorine-containing wastewater treatment system which comprises a fluorine-containing wastewater homogenizing tank, an emergency tank, a sludge thickening tank and a filter press, the fluorine-containing wastewater homogenizing tank is communicated with the emergency tank, and two groups of treatment systems A and B are arranged between the fluorine-containing wastewater homogenizing tank and the sludge thickening tank; the system comprises a fluorine-containing reaction tank 1, a fluorine-containing reaction tank 2, a fluorine-containing coagulation tank, a fluorine-containing flocculation tank, a fluorine-containing sedimentation tank and a fluorine-containing clarification tank which are sequentially communicated, the fluorine-containing reaction tank 1 is further communicated with a fluorine-containing wastewater homogenizing tank, the fluorine-containing sedimentation tank is communicated with a sludge concentration tank, H2SO4, NaOH and CaCl2 are added into the fluorine-containing reaction tank 1A, the fluorine-containing reaction tank 2A, the fluorine-containing reaction tank 1B and the fluorine-containing reaction tank 2B, and the fluorine-containing wastewater homogenizing tank is communicated with the fluorine-containing clarification tank. PAC and CaCl2 are added into the fluorine-containing coagulating basin A and the fluorine-containing coagulating basin B respectively. The device has six treatment modes, and the operation mode can be flexibly adjusted according to the actual water inflow, water quality, system treatment conditions and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an integrated fluorine-containing wastewater treatment system. Background Art

[0002] At present, a large amount of fluoride-containing wastewater is generated in the industrial production process of some industries, and the main pollutants are fluoride, pH, COD, SS, etc. The fluoride ion content can reach 60-2000 mg / L, with an average of about 1000 mg / L. The treatment method for fluoride-containing wastewater is usually calcium salt precipitation defluoridation, that is, adding calcium hydroxide or calcium chloride and other agents to the wastewater to form calcium fluoride precipitation to remove fluoride in the wastewater.

[0003] The existing wastewater treatment system cannot flexibly adjust its operating mode according to changes in the influent water volume and water quality, which makes the overall treatment process long and the operating costs high.

[0004] Therefore, we propose an integrated fluoride-containing wastewater treatment system to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated fluorine-containing wastewater treatment system to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: an integrated fluorine-containing wastewater treatment system, comprising: a fluorine-containing wastewater equalization tank, an emergency tank, a sludge concentration tank and a filter press, wherein the fluorine-containing wastewater equalization tank is connected to the emergency tank;

[0007] Two treatment systems, A and B, are arranged between the fluorine-containing wastewater homogenization tank and the sludge concentration tank;

[0008] The treatment system A comprises a fluorine-containing reaction tank 1A and a fluorine-containing reaction tank 2A, a fluorine-containing coagulation tank A, a fluorine-containing flocculation tank A, a fluorine-containing sedimentation tank A and a fluorine-containing clarification tank A which are connected in sequence, wherein the fluorine-containing reaction tank 1A is also connected to a fluorine-containing wastewater homogenization tank, and the fluorine-containing sedimentation tank A is connected to a sludge thickening tank;

[0009] The B treatment system comprises a fluorine-containing reaction tank 1B and a fluorine-containing reaction tank 2B, a fluorine-containing coagulation tank B, a fluorine-containing flocculation tank B, a fluorine-containing sedimentation tank B and a fluorine-containing clarification tank B which are connected in sequence, wherein the fluorine-containing reaction tank 1B is also connected to a fluorine-containing wastewater homogenization tank, and the fluorine-containing sedimentation tank B is connected to a sludge thickening tank;

[0010] H2SO4, NaOH and CaCl2 are added to the fluorine-containing reaction pool 1A, the fluorine-containing reaction pool 2A, the fluorine-containing reaction pool 1B and the fluorine-containing reaction pool 2B;

[0011] PAC and CaCl2 are added into the fluorine-containing coagulation tank A and the fluorine-containing coagulation tank B.

[0012] Preferably, the fluorine-containing reaction tanks 1A, 1B, fluorine-containing reaction tanks 2A, 2B, and fluorine-containing coagulation tanks A, B are all equipped with online pH meters and F ion detectors.

[0013] Preferably, the dosing pipes for H2SO4, NaOH and CaCl2 adopt a loop design.

[0014] The integrated fluorine-containing wastewater treatment process based on the above system includes six modes, among which the steps of mode 1 for the A treatment system to operate alone are as follows:

[0015] S1, fluoride-containing wastewater enters the fluoride-containing wastewater equalization tank;

[0016] S2, the fluorine-containing wastewater and the fluorine-containing wastewater in the pool enter the fluorine-containing reaction pool 1A for reaction;

[0017] S3, the fluorine-containing wastewater after the reaction enters the fluorine-containing reaction tank 2A ​​for reaction;

[0018] S4, the fluorine-containing wastewater after the reaction enters the fluorine-containing coagulation tank A for coagulation;

[0019] S5, the fluorine-containing wastewater after coagulation enters the fluorine-containing flocculation tank A for flocculation;

[0020] S6, the fluorine-containing wastewater after flocculation enters the fluorine-containing sedimentation tank A for sedimentation;

[0021] S7. The fluoride-containing water after precipitation enters the fluoride-containing clarification tank A for clarification. The qualified clarified water enters the subsequent treatment, and the unqualified water returns to the emergency tank and then enters the fluoride-containing wastewater balancing tank to enter the treatment system for treatment again;

[0022] S8. The sludge produced by fluoride precipitation enters the sludge thickening tank, is pressed into mud cake by the filter press and transported out, the filtrate backwash liquid produced is returned to the sludge thickening tank, and the supernatant produced by the sludge thickening tank is returned to the fluoride wastewater equalization tank and enters the treatment system for treatment again.

[0023] Preferably, the mode two is that the B processing system runs alone, and its operation process is the same as that of mode one.

[0024] Preferably, the mode three is that the A and B processing systems operate in parallel, that is, the mode one and the mode two operate synchronously.

[0025] Preferably, the mode four is the series operation of the A treatment system to the B treatment system, that is, the A treatment system is operated first, and the unqualified water generated passes through the emergency pool and the fluorine-containing wastewater equalization pool and then enters the B treatment system for further treatment.

[0026] Preferably, the mode five is the series operation of the B treatment system to the A treatment system, that is, the B treatment system is operated first, and the unqualified water generated passes through the emergency pool and the fluorine-containing wastewater uniforming pool and enters the A treatment system for further treatment.

[0027] Preferably, the mode six is ​​an emergency mode, and the fluorine-containing wastewater is discharged into an emergency pool for temporary storage.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] 1. Centralized pretreatment of wastewater with a fluoride ion content of 60-2000 mg / L and an average of about 1000 mg / L can simplify the process, save layout space, and save costs. After treatment, the fluoride content in the wastewater can be reduced to below 10 mg / L;

[0030] 2. There are six processing modes, and the operation mode can be flexibly adjusted according to the actual water inflow, water quality, system processing conditions, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] See also Figure 1 The utility model provides a technical solution: an integrated fluorine-containing wastewater treatment system, including: a fluorine-containing wastewater equalization tank, an emergency tank, a sludge concentration tank and a filter press, and the fluorine-containing wastewater equalization tank is connected to the emergency tank;

[0034] Two treatment systems, A and B, are set up between the fluoride-containing wastewater equalization tank and the sludge thickening tank;

[0035] The treatment system A comprises a fluorine-containing reaction tank 1A and a fluorine-containing reaction tank 2A, a fluorine-containing coagulation tank A, a fluorine-containing flocculation tank A, a fluorine-containing sedimentation tank A and a fluorine-containing clarification tank A which are connected in sequence, wherein the fluorine-containing reaction tank 1A is also connected to a fluorine-containing wastewater homogenization tank, and the fluorine-containing sedimentation tank A is connected to a sludge thickening tank;

[0036] The B treatment system comprises a fluorine-containing reaction tank 1B and a fluorine-containing reaction tank 2B, a fluorine-containing coagulation tank B, a fluorine-containing flocculation tank B, a fluorine-containing sedimentation tank B and a fluorine-containing clarification tank B which are connected in sequence, wherein the fluorine-containing reaction tank 1B is also connected to a fluorine-containing wastewater homogenization tank, and the fluorine-containing sedimentation tank B is connected to a sludge thickening tank;

[0037] H2SO4, NaOH and CaCl2 are added to the fluorine-containing reaction pool 1A, the fluorine-containing reaction pool 2A, the fluorine-containing reaction pool 1B and the fluorine-containing reaction pool 2B;

[0038] PAC and CaCl2 were added to both fluoride coagulation tank A and fluoride coagulation tank B;

[0039] There are three dosing points for CaCl2 in the process, the purpose is to add the drug step by step and save the dosage;

[0040] PAM was added to both fluorine-containing flocculation tank A and fluorine-containing flocculation tank B;

[0041] Fluorine-containing reaction tanks 1A, 1B, fluorine-containing reaction tanks 2A, 2B, and fluorine-containing coagulation tanks A, B are equipped with online pH meters and F ion detectors to detect the data in the wastewater at any time. The dosing pipelines of H2SO4, NaOH and CaCl2 adopt a loop design, which can not only ensure the uniformity of chemicals, but also facilitate the control of the automatic valves on the dosing pipelines, and timely adjust the dosing amount according to the data of the online instruments;

[0042] The pH values ​​of fluorine-containing reaction tanks 1A, 1B, 2A, 2B are kept weakly alkaline. Both reaction tanks are equipped with H2SO4 and NaOH dosing pipes. When the amount of alkali added is too much, H2SO4 is added in appropriate amount to neutralize it.

[0043] According to the above structure, six treatment modes of fluoride-containing wastewater are formed as follows:

[0044] Mode 1 is that the A processing system runs alone:

[0045] Step 1: Fluorine-containing wastewater is pumped into a fluorine-containing wastewater equalization tank by a lifting pump;

[0046] Step 2: The fluorine-containing wastewater in the fluorine-containing wastewater pool enters the fluorine-containing reaction pool 1A for reaction, and calcium chloride that is insoluble in water is generated by adjusting the pH value and adding calcium chloride and chloride ions in the water;

[0047] Step 3: The fluorine-containing wastewater after the reaction enters the fluorine-containing reaction tank 2A ​​for reaction, and calcium chloride that is insoluble in water is generated by adjusting the pH value and adding calcium chloride and chloride ions in the water;

[0048] Step 4: The fluorine-containing wastewater after the reaction enters the fluorine-containing coagulation tank A and PAC is added to cause coagulation reaction;

[0049] Step 5: The fluorine-containing wastewater after coagulation enters the fluorine-containing flocculation tank A, and PAM is added to precipitate and flocculate small particles in the wastewater into large particles;

[0050] Step 6: The fluorine-containing wastewater after flocculation enters the fluorine-containing sedimentation tank A to precipitate and remove large flocculated particles;

[0051] Step 7: The fluoride-containing water after precipitation enters the fluoride-containing clarification tank A for clarification. The qualified clarified water enters the subsequent treatment, and the unqualified water returns to the emergency tank and then enters the fluoride-containing wastewater averaging tank to enter the treatment system for treatment again;

[0052] Step 8: The sludge produced by the fluorine-containing precipitation enters the sludge thickening tank, is pressed into mud cakes by the filter press and transported out, the filtrate backwash liquid produced returns to the sludge thickening tank, and the supernatant produced by the sludge thickening tank returns to the fluorine-containing wastewater equalization tank and enters the treatment system for treatment again;

[0053] Mode 2 is that the B processing system operates alone, and its operation process is the same as that of Mode 1;

[0054] Mode 3 is the parallel operation of the A and B processing systems, that is, the synchronous operation of Mode 1 and Mode 2;

[0055] Mode 4 is the series operation of treatment system A to treatment system B, that is, the treatment system A is operated first, and the unqualified water generated passes through the emergency pool and the fluoride-containing wastewater equalization pool and then enters the treatment system B for further treatment;

[0056] Mode 5 is the series operation of the B treatment system to the A treatment system, that is, the B treatment system is operated first, and the unqualified water generated passes through the emergency pool and the fluoride-containing wastewater balancing pool and enters the A treatment system for further treatment;

[0057] Mode six is ​​the emergency mode, and fluoride-containing wastewater is discharged into the emergency pool for temporary storage.

[0058] The sewage treatment data using this integrated fluorine-containing wastewater treatment system are shown in the following table:

[0059]

[0060] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated fluorine-containing wastewater treatment system, characterized in that: include: Fluoride-containing wastewater equalization tank, emergency tank, sludge thickening tank and filter press. The fluoride-containing wastewater equalization tank is connected to the emergency tank; Two treatment systems, A and B, are arranged between the fluorine-containing wastewater homogenization tank and the sludge concentration tank; The treatment system A comprises a fluorine-containing reaction tank 1A and a fluorine-containing reaction tank 2A, a fluorine-containing coagulation tank A, a fluorine-containing flocculation tank A, a fluorine-containing sedimentation tank A and a fluorine-containing clarification tank A which are connected in sequence, wherein the fluorine-containing reaction tank 1A is also connected to a fluorine-containing wastewater homogenization tank, and the fluorine-containing sedimentation tank A is connected to a sludge thickening tank; The B treatment system comprises a fluorine-containing reaction tank 1B and a fluorine-containing reaction tank 2B, a fluorine-containing coagulation tank B, a fluorine-containing flocculation tank B, a fluorine-containing sedimentation tank B and a fluorine-containing clarification tank B which are connected in sequence, wherein the fluorine-containing reaction tank 1B is also connected to a fluorine-containing wastewater homogenization tank, and the fluorine-containing sedimentation tank B is connected to a sludge thickening tank; H2SO4, NaOH and CaCl2 are added to the fluorine-containing reaction pool 1A, the fluorine-containing reaction pool 2A, the fluorine-containing reaction pool 1B and the fluorine-containing reaction pool 2B; PAC and CaCl2 are added into the fluorine-containing coagulation tank A and the fluorine-containing coagulation tank B.

2. The integrated fluorine-containing wastewater treatment system according to claim 1, characterized in that: The fluorine-containing reaction tanks 1A, 1B, fluorine-containing reaction tanks 2A, 2B, and fluorine-containing coagulation tanks A, B are all equipped with online pH meters and F ion detectors.

3. The integrated fluorine-containing wastewater treatment system according to claim 1, characterized in that: The dosing pipes for H2SO4, NaOH and CaCl2 are designed in a loop.

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