A device for treating waste water from the production of flame retardants
By employing steps such as Fenton oxidation, biochemical treatment, flocculation, microbial treatment, and RO treatment, the problems of high biotoxicity and poor biodegradability of wastewater from the production of tetramethylolphosphine flame retardant have been solved, achieving efficient wastewater treatment and compliance with discharge standards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SICHUAN HANSHEN ENVIRONMENTAL ENG CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-05-29
AI Technical Summary
The wastewater from the production of tetramethylolphosphine flame retardants is difficult to treat directly due to its high biotoxicity and poor biodegradability. Furthermore, the treatment equipment must include a complete process of sedimentation, biochemical treatment, RO treatment, and evaporation to ensure the effectiveness.
The wastewater is initially treated using a Fenton oxidation system, followed by biochemical treatment, flocculation treatment, and microbial treatment, combined with RO treatment, vacuum water intake, and evaporation concentration. This ensures that Fe2+ and H2O2 are fully mixed with the wastewater, breaking down recalcitrant organic matter. The neutralization mixing tank adjusts the acidity, the flocculation mixing tank removes suspended particulate matter, the microbial mixing tank degrades organic matter, the filter plate completes the filtration, the RO treatment system intercepts pollutants, the vacuum water intake removes air, and the evaporation concentration system achieves salt crystallization and separation.
It effectively reduces wastewater toxicity, enhances microbial activity, ensures wastewater meets discharge standards, achieves full-process treatment effects, solves the problems of high biological toxicity and poor biodegradability, and guarantees treatment results.
Smart Images
Figure CN122102448A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wastewater treatment technology, and in particular to a treatment device for wastewater from flame retardant production. Background Technology
[0002] The flame retardant is tetramethylolphosphine sulfate. The wastewater from the production of tetramethylolphosphine sulfate needs to undergo pretreatment → oxidation → biochemical treatment → deep treatment → concentration and reduction to ensure the treatment effect.
[0003] A wastewater treatment device for processing phosphorus-based flame retardants, authorized by announcement number CN112209556A, includes an inlet pipe, a first water tank fixedly connected inside the main body and located below the inlet pipe, a functional box fixedly connected inside the main body, a motor fixedly connected inside the functional box, a plurality of stirring rods rotatably connected inside the first water tank, the stirring rods being connected together by pulley sleeves, the output shaft end of the motor being fixedly connected to one of the stirring rods, a fixing rod fixedly connected inside the main body, a placement rod fixedly connected inside the fixing rod, and the outer wall of the placement rod having a hollow design. The storage rod is located in the first water tank. By treating the wastewater multiple times, the quality of wastewater treatment is improved, and the non-toxic liquid is separated and not treated together with the wastewater, thus improving environmental protection. Existing wastewater treatment devices for tetramethylol phosphate flame retardant production have high biological toxicity and poor biodegradability, making direct biological treatment difficult. Since tetramethylol phosphate has a strong bactericidal effect on microorganisms, direct entry into the biological system will inhibit microbial activity. At the same time, the treatment device for flame retardant production wastewater should comprehensively include the entire process of sedimentation, biological treatment, RO treatment, and evaporation to ensure treatment effect.
[0004] To address the aforementioned problems, a treatment device for wastewater from flame retardant production is proposed. Summary of the Invention
[0005] The purpose of this invention is to provide a treatment device for wastewater from flame retardant production, which solves the problem that existing treatment devices for tetramethylol phosphate flame retardant production wastewater in the background art have high biotoxicity and poor biodegradability, making direct biochemical treatment difficult. Since tetramethylol phosphate has a strong bactericidal effect on microorganisms, direct entry into the biochemical system will inhibit microbial activity. At the same time, the treatment device for flame retardant production wastewater should comprehensively include the entire process of sedimentation, biochemical treatment, RO treatment, and evaporation to ensure the treatment effect.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a treatment device for flame retardant production wastewater, comprising a Fenton oxidation mechanism, a biochemical treatment mechanism connected to one side of the Fenton oxidation mechanism, an RO treatment mechanism connected to one side of the biochemical treatment mechanism, a vacuum water intake mechanism connected to one side of the RO treatment mechanism, an evaporation and concentration mechanism fixedly installed on one side of the vacuum water intake mechanism, the Fenton oxidation mechanism including a Fenton oxidation tank, the biochemical treatment mechanism including a neutralization and stirring tank connected to the Fenton oxidation tank, a flocculation and stirring tank installed on one side of the neutralization and stirring tank, a microbial stirring tank installed on one side of the flocculation and stirring tank, a filter plate installed on one side of the microbial stirring tank, the RO treatment mechanism connected to the filter output end of the filter plate, the treated water output by the RO treatment mechanism being evaporated by the vacuum water intake mechanism, and the treated water output from the vacuum water intake mechanism being evaporated and concentrated by the evaporation and concentration mechanism before being output.
[0007] Furthermore, the Fenton oxidation mechanism also includes a wastewater pipe fixed to one side of the Fenton oxidation tank, and the output end of the Fenton oxidation tank is connected to a first water outlet pipe, on which a first water pump is fixedly installed.
[0008] Furthermore, the biochemical treatment mechanism also includes a biochemical treatment tank, wherein the neutralization stirring tank, the flocculation stirring tank and the microbial stirring tank are continuously located on one side of the biochemical treatment tank, and the filter plates are fixed side by side in the biochemical treatment tank.
[0009] Furthermore, a central trough is provided at the lower end of the biochemical treatment tank corresponding to the filter plate, and a second water outlet pipe is fixedly provided at the output end of the central trough, with two sets of the second water outlet pipe.
[0010] Furthermore, the RO treatment mechanism includes a basket filter connected to one end of the second outlet pipe, and a second water pump is connected to one side of the basket filter.
[0011] Furthermore, the output end of the second water pump is connected to an RO membrane tube, and multiple sets of RO membrane tubes are arranged in parallel. The product water outlet of the RO membrane tube, i.e. the permeate output end, is connected to a water permeate membrane tube.
[0012] Furthermore, the RO membrane tube concentrate outlet, i.e. the concentrate output end, is connected to a waste pipe.
[0013] Furthermore, the vacuum water intake mechanism includes a third water pump connected to the output end of the water permeable membrane tube, and a vacuum tank is connected to one side of the third water pump.
[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides a treatment device for flame retardant production wastewater, which performs preliminary treatment of the flame retardant through Fenton oxidation, followed by biochemical treatment. The biochemical treatment is carried out in the following order: neutralization, flocculation, microbial treatment, and filtration, ensuring the optimal treatment efficiency. 2+ H2O2 is thoroughly mixed with wastewater to break down recalcitrant organic matter and reduce toxicity. The wastewater, after treatment in the Fenton oxidation tank, is then fed into the biochemical treatment unit. Due to the Fenton oxidation tank treatment, the wastewater is acidic at this stage. A neutralization mixing tank neutralizes the acidic wastewater, preventing strong acid from directly damaging the microbial cell membranes and creating a stable acid-base environment for subsequent biological treatment. This also prevents the acidic conditions from affecting the flocculant's effectiveness. The flocculation mixing tank is connected to the neutralization mixing tank. Flocculants are added to the flocculation mixing tank to remove suspended particulate matter, oxidation residues from pretreatment, and some inorganic phosphorus precipitates from the wastewater. The output end of the flocculation mixing tank is located on the upper side, ensuring that the wastewater entering the microbial mixing tank has undergone preliminary sedimentation treatment. The microorganisms in the microbial mixing tank focus on degrading residual organic matter and pollutants, avoiding the impact of impurities and pH levels in the early stages. The fluctuations inhibit the activity of the microbial community, improve the degradation efficiency, and the wastewater output from the microbial mixing tank is filtered through a filter plate. Subsequently, the pollutants are intercepted by the RO treatment unit, producing water that meets the standards. This solves the problem that the wastewater from the production of tetramethylol phosphate flame retardant is difficult to treat directly due to its high biotoxicity and poor biodegradability. Also, since tetramethylol phosphate has a strong bactericidal effect on microorganisms, directly entering the biological system would inhibit the activity of microorganisms.
[0015] 2. The present invention provides a treatment device for wastewater from flame retardant production, which uses a vacuum water intake mechanism to remove air from the water channel and an evaporation and concentration mechanism to achieve salt crystallization and separation. This device integrates Fenton oxidation, biochemical treatment, RO treatment, vacuum water intake, and evaporation and concentration, fully ensuring the wastewater treatment effect. It solves the problem that existing treatment devices for tetramethylolphosphine flame retardant production wastewater should comprehensively include the entire process of sedimentation, biochemical treatment, RO treatment, and evaporation to ensure the treatment effect. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of the biochemical treatment mechanism and the RO treatment mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the biochemical treatment mechanism and the RO treatment mechanism of the present invention; Figure 5 This is a schematic diagram of the biochemical treatment mechanism of the present invention; Figure 6 This is a schematic diagram of the evaporation and concentration mechanism of the present invention.
[0017] In the diagram: 1. Fenton oxidation mechanism; 11. Fenton oxidation tank; 12. Wastewater pipe; 13. First outlet pipe; 14. First water pump; 2. Biochemical treatment mechanism; 21. Biochemical treatment tank; 22. Neutralization mixing tank; 23. Flocculation mixing tank; 24. Microbial mixing tank; 25. Filter plate; 26. Centralized tank; 27. Second outlet pipe; 3. RO treatment mechanism; 31. Basket filter; 32. Second water pump; 33. RO membrane tube; 34. Water permeable membrane tube; 35. Waste pipe; 4. Vacuum water intake mechanism; 41. Third water pump; 42. Vacuum tank; 5. Evaporation and concentration mechanism; 51. Lower water intake pipe; 52. Plate evaporator; 53. Upper water pipe. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] To address the challenges of directly treating the wastewater from the production of tetramethylolphosphine (TMS) flame retardants, which is characterized by high biotoxicity and poor biodegradability, traditional biological treatment methods are necessary. TMS has a strong bactericidal effect on microorganisms, and its direct introduction into the biological system would inhibit microbial activity. Furthermore, the treatment system for this flame retardant wastewater must comprehensively incorporate sedimentation, biological treatment, RO (reverse osmosis) treatment, and evaporation processes to ensure effective treatment. Figures 1-6 As shown, the following preferred technical solutions are provided: A treatment device for wastewater from flame retardant production includes a Fenton oxidation unit 1, a biochemical treatment unit 2 connected to one side of the Fenton oxidation unit 1, an RO treatment unit 3 connected to one side of the biochemical treatment unit 2, a vacuum water intake unit 4 connected to one side of the RO treatment unit 3, and an evaporation and concentration unit 5 fixedly installed on one side of the vacuum water intake unit 4. The Fenton oxidation unit 1 includes a Fenton oxidation tank 11, the biochemical treatment unit 2 includes a neutralization and stirring tank 22 connected to the Fenton oxidation tank 11, a flocculation and stirring tank 23 installed on one side of the neutralization and stirring tank 22, a microbial stirring tank 24 installed on one side of the flocculation and stirring tank 23, a filter plate 25 installed on one side of the microbial stirring tank 24, the RO treatment unit 3 connected to the filter output end of the filter plate 25, the treated water output from the RO treatment unit 3 being drawn out by the vacuum water intake unit 4, and the treated water output from the vacuum water intake unit 4 being evaporated and concentrated by the evaporation and concentration unit 5 before being output.
[0020] Specifically, Fenton oxidation tank 11 performs Fenton oxidation treatment on tetramethylolphosphine flame retardant to ensure Fe 2+ H2O2 is thoroughly mixed with wastewater to break down recalcitrant organic matter and reduce toxicity. The wastewater, after treatment in Fenton oxidation tank 11, is then fed into biochemical treatment unit 2. Due to the treatment in Fenton oxidation tank 11, the wastewater is now acidic. Neutralization mixing tank 22 neutralizes the acidic wastewater, preventing strong acid from directly damaging the microbial cell membranes and creating a stable acid-base environment for subsequent biological treatment. This also prevents the acidic conditions from affecting the flocculant's effectiveness. Flocculation mixing tank 23 is connected to neutralization mixing tank 22. Flocculant is added to flocculation mixing tank 23 to remove suspended particulate matter, pre-treatment oxidation residues, and some inorganic phosphorus precipitates from the wastewater. The output end of flocculation mixing tank 23 is located on the upper side, ensuring that the wastewater entering microbial mixing tank 24 has undergone preliminary sedimentation treatment. The microorganisms in microbial mixing tank 24 focus on degrading residual organic matter and pollutants, avoiding the impact of impurities and pH levels in the early stages. The fluctuations inhibit the activity of the microbial community and improve the degradation efficiency. The wastewater output from the microbial stirring tank 24 is filtered through the filter plate 25 and then the RO treatment unit 3 intercepts pollutants to produce qualified water. The vacuum water intake unit 4 is used to remove air in the water channel, and the evaporation and concentration unit 5 realizes the crystallization and separation of salts. This device integrates Fenton oxidation, biochemical treatment, RO treatment, vacuum water intake and evaporation and concentration, which fully ensures the wastewater treatment effect.
[0021] Fenton oxidation mechanism 1 also includes a wastewater pipe 12 fixed to one side of the Fenton oxidation tank 11. A first outlet pipe 13 is connected to the output end of the Fenton oxidation tank 11, and a first water pump 14 is fixedly installed on the first outlet pipe 13. The wastewater pipe 12 transports wastewater into the Fenton oxidation tank 11. Under acidic conditions, Fe... 2+ It undergoes a chain reaction with H2O2, Fe 2+ Oxidized to Fe 3+ Simultaneously generate OH, OH has a strong, non-selective oxidizing ability, capable of breaking the chemical bonds of organic matter and decomposing recalcitrant organic compounds into small-molecule organic acids, CO2, and H2O, Fe. 3+ It can further react with H2O2 to produce Fe 2+ Continuous cyclical activation, ultimately Fe 3+ Ferric hydroxide flocs are formed under alkaline conditions, which adsorb some suspended pollutants and assist in subsequent solid-liquid separation. The wastewater is then transported to the neutralization and mixing tank 22 by the first water pump 14 through the first outlet pipe 13.
[0022] The biochemical treatment unit 2 also includes a biochemical treatment tank 21, a neutralization stirring tank 22, a flocculation stirring tank 23 and a microbial stirring tank 24 continuously located on one side of the biochemical treatment tank 21, and filter plates 25 fixed side by side in the biochemical treatment tank 21. The wastewater treatment sequence in the biochemical treatment unit 2 is as follows: neutralization treatment is performed in the neutralization stirring tank 22, flocculation treatment is performed in the flocculation stirring tank 23, and solid-liquid separation filtration treatment is performed by the filter plates 25 built into the biochemical treatment tank 21. A collection tank 26 is provided at the lower end of the biochemical treatment tank 21 corresponding to the filter plates 25. A second water outlet pipe 27 is fixedly provided at the output end of the collection tank 26. Two sets of second water outlet pipes 27 are provided. The second water outlet pipes 27 centrally output the filtered water in the collection tank 26 to the RO treatment unit 3.
[0023] The RO treatment unit 3 includes a basket filter 31 connected to one end of the second outlet pipe 27. A second water pump 32 is connected to one side of the basket filter 31. The function of the basket filter 31 is to intercept large particulate impurities in the wastewater, preventing these impurities from entering the RO membrane tube 33 and causing blockage or wear. The basket filter 31 is existing equipment, with a basket-shaped filter element inside for easy disassembly and cleaning. The second water pump 32 provides power for the filtration of the RO membrane tube 33. The output end of the second water pump 32 is connected to the RO membrane tube 33. Multiple sets of RO membrane tubes 33 are arranged in parallel. The permeate outlet of the RO membrane tube 33, i.e., the permeate output end, is connected to a water permeate membrane tube 34. The RO membrane tube 33 is existing technology. The arrangement of multiple RO membrane tubes 33 increases the treatment efficiency. The water permeable membrane tube 34 is connected to the central tube interface of the RO membrane tube 33, which is located off-center and is interconnected with the vacuum water priming mechanism 4. The concentrate outlet of the RO membrane tube 33, i.e. the concentrated liquid output end, is connected to the waste pipe 35. The pipeline connected to the waste pipe 35 leads to the wastewater ratio valve, the concentrate return pipe, or the drain outlet. The vacuum water priming mechanism 4 includes a third water pump 41 connected to the output end of the water permeable membrane tube 34. A vacuum tank 42 is connected to one side of the third water pump 41. The third water pump 41 draws water from the water permeable membrane tube 34 into the vacuum tank 42. The negative pressure in the vacuum tank 42 draws out the air in the pipeline. The pressure gauge on the top is used to monitor the vacuum degree in the tank.
[0024] The evaporation and concentration mechanism 5 includes a lower water inlet pipe 51 connected to the output end of the vacuum water inlet mechanism 4. One end of the lower water inlet pipe 51 is connected to a plate evaporator 52. The lower water inlet pipe 51 introduces water into the lower end of the plate evaporator 52, and the plate evaporator 52 performs evaporation treatment. The output end of the plate evaporator 52 is connected to an upper water inlet pipe 53, and the upper water inlet pipe 53 outputs the treated water after evaporation.
[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Meanwhile, conventional transmission, fixing, power supply, and other auxiliary components are not all shown as they are common knowledge in the art; their structures, materials, and assembly methods are also common knowledge. Those skilled in the art can directly select suitable components to assemble with the core innovative components of this embodiment according to conventional design specifications.
[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A treatment device for wastewater from flame retardant production, comprising a Fenton oxidation mechanism (1), characterized in that: A biochemical treatment mechanism (2) is connected to one side of the Fenton oxidation mechanism (1), an RO treatment mechanism (3) is connected to one side of the biochemical treatment mechanism (2), a vacuum water intake mechanism (4) is connected to one side of the RO treatment mechanism (3), and an evaporation and concentration mechanism (5) is fixedly installed on one side of the vacuum water intake mechanism (4). The Fenton oxidation mechanism (1) includes a Fenton oxidation tank (11), and the biochemical treatment mechanism (2) includes a neutralization stirring tank (22) connected to the Fenton oxidation tank (11). A flocculation stirring tank (23) is provided on one side of the neutralization stirring tank (22), and a microbial stirring tank (24) is provided on one side of the flocculation stirring tank (23). A filter plate (25) is provided on one side of the microbial stirring tank (24). The RO treatment mechanism (3) is connected to the filter output end of the filter plate (25). The treated water output by the RO treatment mechanism (3) is evacuated by a vacuum water intake mechanism (4), and the treated water at the output end of the vacuum water intake mechanism (4) is evaporated and concentrated by an evaporation and concentration mechanism (5) before being output.
2. The device for treating wastewater from flame retardant production as described in claim 1, characterized in that: The Fenton oxidation mechanism (1) also includes a wastewater pipe (12) fixed on one side of the Fenton oxidation tank (11), and the output end of the Fenton oxidation tank (11) is connected to a first water outlet pipe (13), and a first water pump (14) is fixedly installed on the first water outlet pipe (13).
3. The device for treating wastewater from flame retardant production as described in claim 2, characterized in that: The biochemical treatment unit (2) also includes a biochemical treatment tank (21), wherein the neutralization stirring tank (22), the flocculation stirring tank (23) and the microbial stirring tank (24) are continuously located on one side of the biochemical treatment tank (21), and the filter plate (25) is fixed side by side in the biochemical treatment tank (21).
4. The device for treating wastewater from flame retardant production as described in claim 3, characterized in that: The biochemical treatment tank (21) is provided with a central tank (26) at the lower end of the filter plate (25). The output end of the central tank (26) is fixedly provided with a second water outlet pipe (27), and there are two sets of the second water outlet pipe (27).
5. The device for treating wastewater from flame retardant production as described in claim 4, characterized in that: The RO treatment unit (3) includes a basket filter (31) connected to one end of the second outlet pipe (27), and a second water pump (32) is connected to one side of the basket filter (31).
6. The device for treating wastewater from flame retardant production as described in claim 5, characterized in that: The output end of the second water pump (32) is connected to an RO membrane tube (33). Multiple sets of RO membrane tubes (33) are arranged in parallel. The product water outlet of the RO membrane tube (33), i.e. the permeate output end, is connected to a water permeate membrane tube (34).
7. The device for treating wastewater from flame retardant production as described in claim 6, characterized in that: The RO membrane tube (33) has a concentrate outlet, i.e., a waste pipe (35) connected to the concentrate output end.
8. The device for treating wastewater from flame retardant production as described in claim 7, characterized in that: The vacuum water intake mechanism (4) includes a third water pump (41) connected to the output end of the water permeable membrane tube (34), and a vacuum tank (42) is connected to one side of the third water pump (41).
9. The device for treating wastewater from flame retardant production as described in claim 1, characterized in that: The evaporation and concentration mechanism (5) includes a lower water inlet pipe (51) connected to the output end of the vacuum water inlet mechanism (4), and one end of the lower water inlet pipe (51) is connected to a plate evaporator (52).
10. The device for treating wastewater from flame retardant production as described in claim 9, characterized in that: The output end of the plate evaporator (52) is connected to an upper water pipe (53).