Device for treating quaternary phosphorus salt-containing wastewater through biochemical and Fenton oxidation
By designing a continuous process flow including a hydrolytic acidification tank, a UASB reactor, an aerobic aeration tank and a Fenton oxidation tank, the problem of high operating costs when treating leather wastewater in the prior art is solved, and efficient removal of organic matter and phosphorus is achieved, and the amount of sludge and agents is reduced.
Patent Information
- Application Number
- CN202421645176.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-11
AI Technical Summary
When treating leather wastewater, the prior art is greatly affected by water fluctuations, and the proportion of agents needs to be frequently adjusted, resulting in a large amount of sludge, resulting in high operating costs.
A device for biochemical plus Fenton oxidation treatment of quaternary phosphorus salt wastewater is designed, including a hydrolytic acidification tank, UASB reactor, aerobic aeration tank and a Fenton oxidation tank. It is processed through a continuous process flow, including hydrolytic acidification, anaerobic treatment, aerobic aeration and Fenton oxidation, to achieve efficient treatment of wastewater.
Through this device, it is possible to significantly remove organic matter and phosphorus, reduce the use of sludge and pharmaceutical agents, reduce operating costs, meet environmental protection standards, and avoid the impact on the anaerobic system.
Smart Images
Figure CN222795365U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation. Background Art
[0002] The phosphorus in leather wastewater mainly comes from the tanning agent used in the leather making process, and exists mainly in the form of trihydroxymethylphosphine oxide (THPO) and tetrakishydroxymethylphosphonium sulfate (THPS), which are difficult to be biodegraded and have certain biological toxicity. Our company currently uses PAC (polyaluminium chloride) flocculation + Fenton oxidation to treat phosphorus tanning wastewater before entering the comprehensive water treatment system. After dilution and treatment of comprehensive water, the phosphorus in the outlet water can meet the discharge standard.
[0003] However, during daily operation, it was found that the process was greatly affected by water fluctuations, and the dosage ratio of ferrous iron and hydrogen peroxide needed to be continuously adjusted according to the phosphorus situation in the incoming water. At the same time, a large amount of sludge would be produced after the reaction through the input of a large amount of reagents. During the sludge filtration process, a large amount of phosphorus would also be released, and the phosphorus needed to continue to be treated, so the operating cost was very high.
[0004] Therefore, those skilled in the art are in urgent need of developing a device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation. Utility Model Content
[0005] The utility model aims to solve the shortcomings in the prior art and proposes a device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for treating quaternary phosphate-containing wastewater by biochemical plus Fenton oxidation, comprising a hydrolysis acidification tank, which is sequentially connected to a UASB reactor, an aerobic aeration tank, and a Fenton oxidation tank; a first sedimentation tank is arranged between the aerobic aeration tank and the Fenton oxidation tank, and both sides of the first sedimentation tank are respectively connected to the aerobic aeration tank and the Fenton oxidation tank, a second sedimentation tank is arranged on one side of the Fenton oxidation tank, and the second sedimentation tank is connected to the Fenton oxidation tank; a first sludge recovery tank is arranged on the side of the UASB reactor, a second sludge recovery tank is arranged on the side of the first sedimentation tank, and a third sludge recovery tank is arranged on the side of the second sedimentation tank.
[0007] Preferably, a first sludge return pipe is connected between the UASB reactor and the first sludge recovery tank, a second sludge return pipe is connected between the first sedimentation tank and the second sludge recovery tank, and a third sludge return pipe is connected between the second sedimentation tank and the third sludge recovery tank. The first sludge return pipe and the second sludge return pipe are both provided with sludge return pumps.
[0008] Preferably, a first stirring device is provided inside the hydrolysis acidification tank, and the first stirring device is connected to the inner wall of the hydrolysis acidification tank through a first stirring bracket.
[0009] Preferably, the Fenton oxidation tank comprises a first treatment chamber, a second treatment chamber and a third treatment chamber which are connected in sequence.
[0010] Preferably, a second stirring device is provided inside the first processing chamber, and the second stirring device is connected to the inner wall of the first processing chamber through a second stirring bracket.
[0011] Preferably, a wastewater treatment reflux pipe is provided between the hydrolysis acidification tank and the second sedimentation tank, and the wastewater treatment reflux pipe is provided with a wastewater reflux pump.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] 1. In the utility model, hydrolysis and acidification are carried out in a hydrolysis and acidification tank to convert insoluble organic matter into soluble organic matter. During the hydrolysis and acidification process, macromolecular organic matter is converted into small molecules through the action of microorganisms, thereby improving the biodegradability of wastewater. At the same time, a large amount of Fenton return water is neutralized to reduce the toxicity of the overall phosphate tanning wastewater, thereby creating a good operating environment for anaerobic operation and avoiding affecting the anaerobic commissioning operation.
[0014] 2. In the utility model, the total phosphorus content of the anaerobic inlet is guaranteed by controlling the return of the Fenton effluent in the front hydrolysis and acidification stage to ensure the normal operation of the anaerobic system. Under anaerobic conditions, polyphosphate bacteria hydrolyze some insoluble THPS through hydrolysis and acidification inside the UASB reactor, thereby reducing the use of reagents. The sludge generated during the reaction needs to be returned to the hydrolysis and acidification tank to maintain the sludge concentration in the hydrolysis and acidification tank.
[0015] 3. In the utility model, the aerobic aeration tank reduces the problem of part of the volatile acid or hydrogen sulfide produced by the anaerobic reaction entering the subsequent Fenton reaction, resulting in unnecessary consumption of reagents; at the same time, through rapid aerobic phosphorus polysorption, the absorption of phosphorus is improved, the orthophosphate converted in the anaerobic stage is removed, and the degradation of organic pollutants is promoted.
[0016] 4. The coherent process flow of the utility model ensures the efficient treatment of leather phosphorus-containing wastewater and achieves a substantial removal of organic matter and phosphorus. At the same time, the amount of sludge and the amount of added chemicals will also be reduced, which can meet environmental protection standards while reducing overall operating costs and reducing secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2This is the internal structure diagram of the hydrolysis acidification tank of the utility model;
[0019] Figure 3 This is a diagram of the internal structure of the Fenton oxidation tank described in the utility model.
[0020] In the figure: 1-hydrolysis acidification tank; 101-stirring device; 102-stirring support; 2-UASB reactor; 3-aerobic aeration tank; 4-first sedimentation tank; 5-Fenton oxidation tank; 51-first treatment chamber; 52-second treatment chamber; 53-third treatment chamber; 6-second sedimentation tank; 7-first sludge recovery tank; 8-second sludge recovery tank; 9-third sludge recovery tank. DETAILED DESCRIPTION
[0021] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.
[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0024] See also Figure 1-Figure 3The utility model provides an embodiment: a device for treating quaternary phosphate-containing wastewater by biochemical plus Fenton oxidation, comprising a hydrolysis acidification tank 1, which is sequentially connected to a UASB reactor 2, an aerobic aeration tank 3, and a Fenton oxidation tank 5; a first sedimentation tank 4 is provided between the aerobic aeration tank 3 and the Fenton oxidation tank 5, and both sides of the first sedimentation tank 4 are respectively connected to the aerobic aeration tank 3 and the Fenton oxidation tank 5; a second sedimentation tank 6 is provided on one side of the Fenton oxidation tank 5, and the second sedimentation tank 6 is connected to the Fenton oxidation tank 5; a first sludge recovery tank 7 is provided on the side of the UASB reactor 2, A second sludge recovery tank 8 is provided on the side of the first sedimentation tank 4, a third sludge recovery tank 9 is provided on the side of the second sedimentation tank 6, a first sludge return pipe is connected between the UASB reactor 2 and the first sludge recovery tank 7, a second sludge return pipe is connected between the first sedimentation tank 4 and the second sludge recovery tank 8, a third sludge return pipe is connected between the second sedimentation tank 6 and the third sludge recovery tank 9, sludge return pumps are provided on the first sludge return pipe and the second sludge return pipe, a wastewater treatment return pipe is provided between the hydrolysis acidification tank 1 and the second sedimentation tank 6, and the wastewater treatment return pipe is provided with a wastewater return pump.
[0025] Hydrolysis and acidification are carried out in the hydrolysis and acidification tank 1 to convert insoluble organic matter into soluble organic matter. During the hydrolysis and acidification process, macromolecular organic matter is converted into small molecules through the action of microorganisms, thereby improving the biodegradability of the wastewater. At the same time, the high redox potential (ORP) value in a large amount of Fenton return water is neutralized to reduce the toxicity of the overall phosphate tanning wastewater, create a good operating environment for anaerobic operation, and buffer the high redox potential (ORP) value and dissolved oxygen (DO) in the Fenton effluent when a large amount of Fenton is returned, which often affects the anaerobic operation, thereby avoiding the impact on the anaerobic commissioning operation.
[0026] A lifting pump is provided between the hydrolysis acidification tank 1 and the UASB reactor 2. The phosphorus-containing wastewater after hydrolysis acidification treatment enters the UASB reactor 2 through the lifting pump for anaerobic treatment. The main phosphorus-containing compounds in the phosphorus-containing wastewater are tetrakis(hydroxymethyl)phosphine sulfate (THPS) and tris(hydroxymethyl)phosphine oxide (THPO). However, the high content of tetrakis(hydroxymethyl)phosphine sulfate (THPS) and tris(hydroxymethyl)phosphine oxide (THPO) in the wastewater has a very obvious inhibitory effect on microorganisms.
[0027] To this end, we have conducted continuous experimental attempts, and the results show that when the phosphorus content is lower than 120 mg / L, the toxicity to anaerobic microorganisms is not very obvious. The total phosphorus in the anaerobic inlet is controlled by returning the Fenton effluent from the previous hydrolysis and acidification stage to ensure the normal operation of the anaerobic system.
[0028] Under anaerobic conditions, polyphosphate bacteria use the volatile organic acids produced in the hydrolysis and acidification stage as electron acceptors for anaerobic metabolism, converting some insoluble THPS into orthophosphate with a conversion efficiency of about 54%. At the same time, it also reduces most of the chemical oxygen demand (COD) with a removal efficiency of 63%.
[0029] The sludge generated in the UASB process needs to be returned to the hydrolysis acidification tank 1 to maintain the sludge concentration in the hydrolysis acidification tank 1, and the remaining sludge is discharged to the first sludge recovery tank 7.
[0030] The design of aerobic aeration tank 3 is mainly to increase DO and ORP in the water, reduce part of the volatile acid or hydrogen sulfide produced by anaerobic reaction from entering the subsequent Fenton reaction, and cause unnecessary consumption of reagents; at the same time, through rapid aerobic phosphorus polymerization, the absorption of phosphorus is improved, the orthophosphate converted in the anaerobic stage is removed, and sufficient oxygen and bubbles are provided to maintain the normal growth and metabolism of aerobic microorganisms, and promote the degradation of organic pollutants; the aeration duration of the aerobic stage must be accurately controlled in the short term to avoid excessive aeration or delayed aeration leading to the release of phosphorus and waste of electricity.
[0031] The first sedimentation tank 4 performs mud-water separation, and part of the sludge is returned to the aerobic aeration tank 3 in the aerobic stage to maintain the sludge concentration in the aerobic zone, while the remaining sludge is discharged to the second sludge recovery tank 8; the Fenton oxidation tank 5 further treats the organic phosphorus that is difficult to be biodegraded after aerobic treatment through the Fenton oxidation tank.
[0032] Furthermore, the Fenton oxidation tank 5 includes a first treatment chamber 51, a second treatment chamber 52 and a third treatment chamber 53 which are connected in sequence. Ferrous sulfate is added into the first treatment chamber 51 as a catalyst and stirred. At the same time, sulfuric acid is added to adjust the pH value of the influent to 3-4 to prepare conditions for the subsequent oxidation reaction. Hydrogen peroxide is added into the second treatment chamber 52. 2+ Under the catalytic action of , it decomposes to generate strong oxidant hydroxyl radicals. Hydroxyl radicals have extremely high oxidation potential and can non-selectively oxidize organic matter in the wastewater, converting difficult-to-degrade phosphorus-containing compounds into phosphates that are easy to precipitate. An aeration device is provided in the second treatment chamber 52. The role of aeration is to help improve the decomposition efficiency of hydrogen peroxide. Sodium hydroxide is added to the third treatment chamber 53 to adjust the pH value of the wastewater to near neutrality to meet the subsequent treatment requirements.
[0033] After Fenton oxidation, the phosphorus-containing wastewater enters the second sedimentation tank 6. Polyacrylamide (PAM) anions are added to the front end of the sedimentation tank for flocculation and precipitation. The Fenton removal efficiency of total phosphorus is about 70%, of which the COD removal efficiency is about 75%. This coherent process ensures the efficient treatment of leather phosphorus-containing wastewater and achieves a substantial removal of organic matter and phosphorus.
[0034] Furthermore, a first stirring device 101 is provided inside the hydrolysis acidification tank 1, and the first stirring device 101 is connected to the inner wall of the hydrolysis acidification tank 1 through a first stirring bracket 102. A second stirring device 54 is provided inside the first treatment chamber 51, and the second stirring device 54 is connected to the inner wall of the first treatment chamber 51 through a second stirring bracket 55. The first stirring device 101 and the second stirring device 54 are both paddle stirrers, and the paddle stirrers adopt existing technology, so they are not described in detail.
[0035] Working principle of the utility model: when the utility model is in use, the wastewater is firstly hydrolyzed and acidified by the hydrolysis acidification tank 1 to convert the insoluble organic matter into soluble organic matter; then the wastewater enters the UASB reactor 2 for anaerobic treatment to convert part of the insoluble THPS into orthophosphate; then the wastewater enters the aerobic aeration tank 3 to reduce part of the volatile acid or hydrogen sulfide produced by the anaerobic reaction from entering the subsequent Fenton reaction, resulting in unnecessary consumption of reagents; then the wastewater is further dephosphorized by the Fenton oxidation tank and the second sedimentation tank; a wastewater treatment reflux pipe is provided between the hydrolysis acidification tank 1 and the second sedimentation tank 6, so that the wastewater can be circulated and treated.
[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation, characterized in that: It comprises a hydrolysis acidification tank (1), wherein the hydrolysis acidification tank (1) is sequentially connected to a UASB reactor (2), an aerobic aeration tank (3), and a Fenton oxidation tank (5); A first sedimentation tank (4) is provided between the aerobic aeration tank (3) and the Fenton oxidation tank (5), and both sides of the first sedimentation tank (4) are respectively connected to the aerobic aeration tank (3) and the Fenton oxidation tank (5); a second sedimentation tank (6) is provided on one side of the Fenton oxidation tank (5), and the second sedimentation tank (6) is connected to the Fenton oxidation tank (5); A first sludge recovery tank (7) is provided on the side of the UASB reactor (2), a second sludge recovery tank (8) is provided on the side of the first sedimentation tank (4), and a third sludge recovery tank (9) is provided on the side of the second sedimentation tank (6).
2. A device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation according to claim 1, characterized in that: A first sludge return pipe is connected between the UASB reactor (2) and the first sludge recovery tank (7), a second sludge return pipe is connected between the first sedimentation tank (4) and the second sludge recovery tank (8), and a third sludge return pipe is connected between the second sedimentation tank (6) and the third sludge recovery tank (9). Both the first sludge return pipe and the second sludge return pipe are provided with sludge return pumps.
3. A device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation according to claim 1, characterized in that: A first stirring device (101) is provided inside the hydrolysis acidification tank (1), and the first stirring device (101) is connected to the inner wall of the hydrolysis acidification tank (1) via a first stirring support (102).
4. A device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation according to claim 1, characterized in that: The Fenton oxidation tank (5) comprises a first treatment chamber (51), a second treatment chamber (52) and a third treatment chamber (53) which are connected in sequence.
5. A device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation according to claim 4, characterized in that: A second stirring device (54) is provided inside the first processing chamber (51), and the second stirring device (54) is connected to the inner wall of the first processing chamber (51) via a second stirring support (55).
6. A device for treating wastewater containing quaternary phosphate salts by biochemical plus Fenton oxidation according to claim 1, characterized in that: A wastewater treatment reflux pipe is provided between the hydrolysis acidification tank (1) and the second sedimentation tank (6), and the wastewater treatment reflux pipe is provided with a wastewater reflux pump.