A device for treating waste water of propylene oxide by hydrogen peroxide method

Abstract

This utility model relates to the technical field of wastewater treatment devices, specifically to a treatment device for HPPO wastewater generated by the hydrogen peroxide process. The device includes a novel anaerobic reaction system, an integrated high-efficiency low-oxygen reaction system, and an advanced oxidation and biochemical coupling system. The input end of the novel anaerobic reaction system is connected to the wastewater source, used to transport the wastewater to be treated to the system, and its output end is connected to the input end of the integrated high-efficiency low-oxygen reaction system. The output end of the integrated high-efficiency low-oxygen reaction system is connected to the input end of the advanced oxidation and biochemical coupling system. The output end of the advanced oxidation and biochemical coupling system is connected to the wastewater discharge area. This treatment device has a simple structure and low construction cost. By sequentially employing the novel anaerobic reaction system, the integrated high-efficiency low-oxygen reaction system, and the advanced oxidation and biochemical coupling system to comprehensively treat HPPO wastewater, it occupies a small area, has high treatment efficiency, and thus achieves the goal of ensuring HPPO wastewater meets discharge standards.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment devices, and in particular to a device for treating propylene oxide wastewater using the hydrogen peroxide method. Background Technology

[0002] Propylene oxide (PO) is the third largest propylene derivative after polypropylene and acrylonitrile, and is an important basic organic chemical raw material. Propylene oxide is mainly used in the production of polyether polyols, and secondarily in fine chemical products such as surfactants, propylene carbonate, propylene glycol ethers, and hydroxypropyl methylcellulose. It is widely used in the automotive, construction, food, tobacco, pharmaceutical, and cosmetic industries. Currently, there are four main methods for producing propylene oxide: the chlorohydrin process, the co-oxidation process (PO / SM and PO / MTBE), the cumene peroxide process (CHP process), and the direct hydrogen peroxide oxidation process (HPPO process). Among these, the HPPO process, which has only recently achieved industrial application, stands out as an advanced production process due to its significant advantages of being economical, efficient, energy-saving, and environmentally friendly. Compared with other production methods, the core advantages of the HPPO process lie in its simple process flow, high product yield, and pollution-free production characteristics. These characteristics give the HPPO process a unique competitive advantage in terms of economic cost, environmental protection, and sustainable development potential. Although improved chlorohydrin processes, such as the reuse of caustic soda saponification wastewater in electrolyzers or salt production, have been researched and implemented abroad to enhance resource utilization and reduce environmental burden, these measures have failed to fundamentally solve the problem of efficient resource utilization and environmental protection. Instead, they have significantly increased production costs. Therefore, it is expected that the HPPO process, with its comprehensive advantages, will become the mainstream choice for new propylene oxide projects in my country in the near future. However, it is worth noting that the wastewater generated by the HPPO process—specifically, hydrogen peroxide-based propylene oxide wastewater or HPPO wastewater—is facing a major challenge hindering its large-scale industrial application due to its high pollutant concentration and difficulty in biodegradation. Furthermore, specialized research on the wastewater generated by the HPPO process is still lacking, and a mature and complete treatment technology system has not yet been established. Although some patents disclose methods such as distillation and electrolysis to recover propylene glycol and its derivatives from wastewater to improve wastewater quality and reduce the difficulty of subsequent treatment, these methods are costly to invest in equipment for large-scale wastewater treatment and are not suitable for long-term operation due to the poor quality of the wastewater. Therefore, these methods have significant shortcomings in terms of economic rationality and technical applicability, making it difficult to meet the needs of large-scale industrial promotion.

[0003] This invention provides a device for treating propylene oxide wastewater using the hydrogen peroxide method, which solves the problems of high investment cost and poor treatment effect of existing hydrogen peroxide-based propylene oxide wastewater treatment equipment. Utility Model Content

[0004] The purpose of this invention is to provide a treatment device for hydrogen peroxide-based propylene oxide wastewater, in order to solve the problems of high investment cost and poor treatment effect of existing hydrogen peroxide-based propylene oxide wastewater treatment equipment.

[0005] The technical solution of this utility model is: a treatment device for propylene oxide wastewater produced by hydrogen peroxide method, comprising a novel anaerobic reaction system, an integrated high-efficiency low-oxygen reaction system, and an advanced oxidation and biochemical coupling system;

[0006] The input end of the novel anaerobic reaction system is connected to the wastewater source for transporting the wastewater to be treated to the novel anaerobic reaction system, and the output end is connected to the input end of the integrated high-efficiency low-oxygen reaction system; the output end of the integrated high-efficiency low-oxygen reaction system is connected to the input end of the advanced oxidation and biochemical coupling system; the output end of the advanced oxidation and biochemical coupling system is connected to the wastewater discharge area for discharging the treated wastewater to the wastewater discharge area.

[0007] Preferably, the integrated high-efficiency low-oxygen reaction system includes an integrated high-efficiency low-oxygen reactor; the internal partitions of the integrated high-efficiency low-oxygen reactor form a microbial selection zone, a low-oxygen aeration zone, and a sedimentation zone that are sequentially connected.

[0008] The output of the novel anaerobic reaction system is connected to the microbial selection zone, and the precipitation zone is connected to the input of the advanced oxidation and biochemical coupling system.

[0009] An aeration device is installed inside the low-oxygen aeration zone.

[0010] Preferably, the novel anaerobic reaction system includes a novel anaerobic reactor;

[0011] Several three-phase separators are arranged inside the novel anaerobic reactor and parallel to the bottom wall of the novel anaerobic reactor;

[0012] A gas-liquid separator is installed above the novel anaerobic reactor; the bottom of the gas-liquid separator is connected to a downcomer installed inside the novel anaerobic reactor, and the upper end of the gas-liquid separator is connected to the bottom of the novel anaerobic reactor and / or to the gas exhaust zone.

[0013] An outlet is provided on the side wall of the novel anaerobic reactor, near the top of the reactor; the outlet is connected to the bottom of the novel anaerobic reactor and the integrated high-efficiency low-oxygen reaction system.

[0014] Preferably, the novel anaerobic reaction system further includes an advanced pre-oxidation tank;

[0015] The wastewater source is connected to the bottom of the advanced pre-oxidation tank via a pipeline; the upper part of the advanced pre-oxidation tank is connected to the bottom of the novel anaerobic reactor; the upper part of the novel anaerobic reactor is connected to the integrated high-efficiency low-oxygen reaction system.

[0016] The advanced pre-oxidation tank has a packing zone inside, and the packing zone is located in the middle of the advanced pre-oxidation tank.

[0017] Preferably, the advanced oxidation and biochemical coupling system includes an advanced oxidation and biochemical coupling process tank; the interior of the advanced oxidation and biochemical coupling process tank is separated by a partition assembly to form an interconnected ozone oxidation zone and a biochemical zone; the bottom of the ozone oxidation zone is connected to the output end of the integrated high-efficiency low-oxygen reaction system; and the upper part of the biochemical zone is connected to the wastewater discharge zone.

[0018] Preferably, the partition assembly includes two partitions spaced apart; of the two partitions, one closer to the ozone oxidation zone is fixedly connected to the bottom wall of the advanced oxidation and biochemical coupling process tank, and the other is fixedly connected to the top of the advanced oxidation and biochemical coupling process tank.

[0019] Preferably, the advanced oxidation and biochemical coupling system further includes a coagulation sedimentation tank; the bottom of the coagulation sedimentation tank is connected to the output end of the integrated high-efficiency low-oxygen reaction system, and the upper part of the coagulation sedimentation tank is connected to the bottom of the ozone oxidation zone.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] (1) The present invention provides a treatment device for propylene oxide wastewater produced by hydrogen peroxide method. The treatment device comprehensively treats the propylene oxide wastewater produced by hydrogen peroxide method by sequentially adopting a novel anaerobic reaction system, an integrated high-efficiency low-oxygen reaction system, and an advanced oxidation and biochemical coupling system. The treatment efficiency is high and it can achieve the goal of compliant discharge of HPPO wastewater. The novel anaerobic reaction system performs preliminary decomposition and transformation of organic matter in the wastewater. The integrated high-efficiency low-oxygen reaction system further removes organic matter while achieving multiple treatment effects of carbon removal, nitrogen removal, and phosphorus reduction. The advanced oxidation and biochemical coupling system thoroughly mineralizes the recalcitrant organic matter in the wastewater. Thus, the treated wastewater meets the first-class discharge standard requirements in all aspects. At the same time, the treatment device has a simple structure, low construction cost, and small footprint, which solves the problems of high investment cost and poor treatment effect of existing hydrogen peroxide propylene oxide (HPPO) wastewater treatment equipment. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1This is a schematic diagram of the structure of the hydrogen peroxide method for treating propylene oxide wastewater according to the present invention.

[0024] The system includes: 1. Novel anaerobic reaction system; 2. Integrated high-efficiency low-oxygen reaction system; 3. Advanced oxidation and biochemical coupling system; 4. Advanced pre-oxidation tank; 41. Packing zone; 5. Novel anaerobic reactor; 51. Three-phase separator; 52. Gas-liquid separator; 53. Outlet; 6. Integrated high-efficiency low-oxygen reactor; 61. Microbial selection zone; 62. Low-oxygen aeration zone; 63. Sedimentation zone; 64. Aeration device; 7. Advanced oxidation and biochemical coupling process tank; 71. Ozone oxidation zone; 72. Biochemical zone; 73. Baffle assembly; 731. First baffle; 732. Second baffle; 8. Coagulation sedimentation tank. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments:

[0026] A device for treating propylene oxide wastewater using the hydrogen peroxide method, such as... Figure 1 As shown, the system includes a novel anaerobic reaction system 1, an integrated high-efficiency hypoxia reaction system 2, and an advanced oxidation and biochemical coupling system 3. The input of the novel anaerobic reaction system 1 is connected to a wastewater source, used to transport the wastewater to be treated into the novel anaerobic reaction system 1 for anaerobic reaction. The output of the novel anaerobic reaction system 1 is connected to the input of the integrated high-efficiency hypoxia reaction system 2, used to transport the anaerobic-treated wastewater into the integrated high-efficiency hypoxia reaction system 2 for hypoxia reaction. The output of the integrated high-efficiency hypoxia reaction system 2 is connected to the input of the advanced oxidation and biochemical coupling system 3, used to transport the wastewater into the advanced oxidation and biochemical coupling system 3 for further treatment. The output of the advanced oxidation and biochemical coupling system 3 is connected to a wastewater discharge area, used to discharge the treated wastewater into the wastewater discharge area. Using this treatment device to treat HPPO wastewater can ensure that all indicators of the treated wastewater fully meet the Class I discharge standards stipulated in the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB 18978-2002).

[0027] The novel anaerobic reaction system 1 includes a novel anaerobic reactor 5. The interior of the novel anaerobic reactor 5 is equipped with several three-phase separators 51, each of which is parallel to the bottom wall of the reactor. The three-phase separators 51 divide the interior of the reactor into multiple interconnected reaction chambers. A gas-liquid separator 52 is located above the reactor 5. The bottom of the gas-liquid separator 52 is connected to a downcomer located inside the reactor 5. The end is connected to the bottom of the novel anaerobic reactor 5 and the gas discharge area through pipelines, respectively, for discharging biogas or returning biogas to the bottom of the novel anaerobic reactor 5; an outlet 53 is provided on the side wall of the novel anaerobic reactor 5 near the top of the novel anaerobic reactor 5; the outlet 53 is connected to the bottom of the novel anaerobic reactor 5 and the integrated high-efficiency low-oxygen reaction system 2 through pipelines, respectively, for returning the waste liquid in the upper part of the novel anaerobic reactor 5 to the bottom of the novel anaerobic reactor 5 or transporting it to the integrated high-efficiency low-oxygen reaction system 2. This novel anaerobic reactor is a highly efficient biological reaction process developed for the high-concentration organic wastewater generated by the hydrogen peroxide-based propylene oxide process. It integrates fluidized bed technology and sludge granulation technology, with microbial anaerobic digestion at its core. The reactor consists of multiple upper and lower reaction chambers with different kinetic processes. Utilizing the lifting effect of biogas collected from the upper and lower chambers, the reactor significantly increases the hydraulic load of the reaction chambers, ensuring the anaerobic sludge is fully expanded. This enhances the contact and mass transfer process between the sludge and wastewater, greatly improving the digestion rate and organic load of organic matter.

[0028] The novel anaerobic reactor system 1 may further include an advanced pre-oxidation tank 4 for pre-oxidizing the wastewater. This advanced pre-oxidation tank 4 features strong oxidation capacity, simple operation, and rapid reaction, significantly improving the wastewater's B / C ratio and biodegradability. This creates favorable conditions for the subsequent treatment process of the novel anaerobic reactor 5, effectively enhancing the treatment efficiency of the reactor and optimizing its treatment effect, ensuring the entire reaction system achieves more efficient and stable wastewater purification performance. The wastewater source is connected to the bottom of the advanced pre-oxidation tank 4 via a pipeline; the upper part of the advanced pre-oxidation tank 4 is connected to the bottom of the novel anaerobic reactor 5; the advanced pre-oxidation tank 4 contains a packing zone 41 located in the middle. This advanced pre-oxidation tank 4 is particularly suitable for the oxidation treatment of organic pollutants that are difficult to biodegrade, have low biodegradability, or are difficult to treat with general chemical oxidants.

[0029] The integrated high-efficiency low-oxygen reaction system 2 includes an integrated high-efficiency low-oxygen reactor 6. The integrated high-efficiency low-oxygen reactor 6 is internally divided into a microbial selection zone 61, a low-oxygen aeration zone 62 connected to the microbial selection zone 61, and a sedimentation zone 63 connected to the low-oxygen aeration zone 62. An aeration device 64 is installed inside the low-oxygen aeration zone 62. The output end of the novel anaerobic reaction system 1 is connected to the microbial selection zone 61 inside the integrated high-efficiency low-oxygen reactor 6, and the sedimentation zone 63 inside the integrated high-efficiency low-oxygen reactor 6 is connected to the input end of the advanced oxidation and biochemical coupling system 3. Furthermore, the sedimentation zone 63 is also connected to the microbial selection zone 61 via an external pipeline for returning sludge from the sedimentation zone 63 to the microbial selection zone 61. The integrated high-efficiency low-oxygen reaction system 2 adopts a one-piece structure, cleverly integrating the microbial selection zone 61, the low-oxygen aeration zone 62, and the sedimentation zone 63 into the same reaction tank. By controlling the aeration device 64, the system can operate stably under low-oxygen conditions, not only removing organic matter but also simultaneously achieving multiple treatment effects such as carbon removal, nitrogen removal, and phosphorus reduction within a single tank. This structural design significantly simplifies the overall system operation process, greatly reduces the mechanical connection equipment between reactors, and effectively reduces blower energy consumption, achieving a dual optimization of energy saving and consumption reduction with excellent treatment efficiency.

[0030] The advanced oxidation and biochemical coupling system 3 includes an advanced oxidation and biochemical coupling process tank 7. The interior of the advanced oxidation and biochemical coupling process tank 7 is divided by a partition assembly 73 to form an interconnected ozone oxidation zone 71 and a biochemical zone 72. The bottom of the ozone oxidation zone 71 is connected to the output end of the integrated high-efficiency low-oxygen reaction system 2. The upper part of the biochemical zone 72 is connected to a wastewater discharge area. The partition assembly 73 includes two partitions. These two partitions are spaced apart, with one partition closer to the ozone oxidation zone 71 fixedly connected to the bottom wall of the advanced oxidation and biochemical coupling process tank 7, and the other partition fixedly connected to the top of the advanced oxidation and biochemical coupling process tank 7, thereby allowing wastewater from the upper part of the ozone oxidation zone 71 to enter the biochemical zone 72 from the bottom. The advanced oxidation and biochemical coupling process tank 7 integrates ozone advanced oxidation and internal circulation aeration biochemical technology. After the advanced oxidation of low-concentration recalcitrant organic matter, microbial treatment technology is used to further treat the oxidized small-molecule organic matter. Driven by the upward force of aeration microbubbles, a high-flow-rate internal circulation water flow is formed inside the biological packing bed in the biochemical zone 72. The biological packing bed in the circulating water flow can rapidly cultivate a dominant microbial phase with good adaptability to the wastewater by utilizing its own characteristics, forming a high-performance biological oxidation bed. During long-term operation, a proprietary high-efficiency gas filter backwashing technology is used to maintain the activity of the biological phase, thereby ensuring the stable performance of the biological oxidation bed. The ozone oxidation zone 71 is filled with a proprietary metal oxide supported catalyst to catalyze the generation of highly oxidizing hydroxyl radicals from ozone, which mineralize the recalcitrant organic matter in the wastewater and reduce the COD of the effluent.

[0031] The advanced oxidation and biochemical coupling system 3 may also include a coagulation sedimentation tank 8; the bottom of the coagulation sedimentation tank 8 is connected to the output end of the integrated high-efficiency low-oxygen reaction system 2, and the upper part of the coagulation sedimentation tank 8 is connected to the bottom of the ozone oxidation zone 71. The coagulation sedimentation tank 8 is used to pre-treat the wastewater transported to the advanced oxidation and biochemical coupling process tank 7, remove suspended matter in the wastewater, effectively improve the water quality of the wastewater, and create favorable conditions for the subsequent oxidation and biochemical treatment of the wastewater by the advanced oxidation and biochemical coupling process tank 7, which helps to ensure that the entire treatment process can operate efficiently and stably.

[0032] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A device for treating propylene oxide wastewater using hydrogen peroxide, characterized in that, Including a novel anaerobic reaction system (1), an integrated high-efficiency hypoxia reaction system (2), and an advanced oxidation and biochemical coupling system (3); The input end of the novel anaerobic reaction system (1) is connected to the wastewater source and is used to transport the wastewater to be treated to the novel anaerobic reaction system (1). The output end is connected to the input end of the integrated high-efficiency low-oxygen reaction system (2). The output end of the integrated high-efficiency low-oxygen reaction system (2) is connected to the input end of the advanced oxidation and biochemical coupling system (3). The output end of the advanced oxidation and biochemical coupling system (3) is connected to the wastewater discharge area and is used to discharge the treated wastewater to the wastewater discharge area.

2. The processing apparatus according to claim 1, characterized in that: The integrated high-efficiency low-oxygen reaction system (2) includes an integrated high-efficiency low-oxygen reactor (6); the internal partitions of the integrated high-efficiency low-oxygen reactor (6) form a microbial selection zone (61), a low-oxygen aeration zone (62), and a sedimentation zone (63) that are connected in sequence. The output end of the novel anaerobic reaction system (1) is connected to the microbial selection zone (61), and the precipitation zone (63) is connected to the input end of the advanced oxidation and biochemical coupling system (3). An aeration device (64) is installed inside the low-oxygen aeration zone (62).

3. The processing apparatus according to claim 2, characterized in that: The novel anaerobic reaction system (1) includes a novel anaerobic reactor (5); Several three-phase separators (51) are provided inside the novel anaerobic reactor (5) and parallel to the bottom wall of the novel anaerobic reactor (5). A gas-liquid separator (52) is provided above the novel anaerobic reactor (5); the bottom of the gas-liquid separator (52) is connected to a downcomer provided inside the novel anaerobic reactor (5), and the upper end of the gas-liquid separator (52) is connected to the bottom of the novel anaerobic reactor (5) and / or connected to the gas exhaust zone. An outlet (53) is provided on the side wall of the novel anaerobic reactor (5) and near the top of the novel anaerobic reactor (5); the outlet (53) is connected to the bottom of the novel anaerobic reactor (5) and the integrated high-efficiency low-oxygen reaction system (2).

4. The processing apparatus according to claim 3, characterized in that: The novel anaerobic reaction system (1) also includes an advanced pre-oxidation tank (4). Wastewater source is connected to the bottom of the advanced pre-oxidation tank (4) through a pipeline; the upper part of the advanced pre-oxidation tank (4) is connected to the bottom of the novel anaerobic reactor (5); the upper part of the novel anaerobic reactor (5) is connected to the integrated high-efficiency low-oxygen reaction system (2); The advanced pre-oxidation tank (4) is provided with a packing zone (41) inside, and the packing zone (41) is located in the middle of the advanced pre-oxidation tank (4).

5. The processing apparatus according to claim 1, characterized in that: The advanced oxidation and biochemical coupling system (3) includes an advanced oxidation and biochemical coupling process tank (7); the interior of the advanced oxidation and biochemical coupling process tank (7) is divided by a partition assembly (73) to form an interconnected ozone oxidation zone (71) and a biochemical zone (72); the bottom of the ozone oxidation zone (71) is connected to the output end of the integrated high-efficiency low-oxygen reaction system (2); the upper part of the biochemical zone (72) is connected to the wastewater discharge zone.

6. The processing apparatus according to claim 5, characterized in that: The partition assembly (73) includes two partitions spaced apart; one of the two partitions, which is closer to the ozone oxidation zone (71), is fixedly connected to the bottom wall of the advanced oxidation and biochemical coupling process tank (7), and the other is fixedly connected to the top of the advanced oxidation and biochemical coupling process tank (7).

7. The processing apparatus according to claim 5, characterized in that: The advanced oxidation and biochemical coupling system (3) also includes a coagulation sedimentation tank (8); the bottom of the coagulation sedimentation tank (8) is connected to the output end of the integrated high-efficiency low-oxygen reaction system (2), and the upper part of the coagulation sedimentation tank (8) is connected to the bottom of the ozone oxidation zone (71).

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