Energy-saving reactor for biological treatment of industrial wastewater containing DMF (Dimethyl Formamide)

Abstract

The utility model provides an energy-saving reactor for biological treatment of industrial wastewater containing DMF (Dimethyl Formamide), which relates to the field of wastewater treatment and comprises a cavity, a water inlet pipe is arranged on the side wall of the bottom end of the cavity, a support rod is fixedly mounted in the cavity, a sleeve is fixedly mounted on the inner side of the support rod, and an aerator is arranged in the cavity and positioned below the sleeve. A filter cover is fixedly mounted at the top end in the cavity, the top end of the sleeve extends into the filter cover, an exhaust valve is fixedly mounted at the top end of the cavity, a water outlet is formed in the outer side of the top end of the cavity, the cavity is filled with activated carbon and granular sludge, and microbial florae for degrading DMF are attached to the surfaces of the activated carbon and the granular sludge. The sludge particles and the activated carbon particles can be used for bearing microorganisms for degrading DMF, the wastewater is divided into the up-flow area and the down-flow area through the sleeve by the aerator, and the wastewater circularly flows to degrade DMF, so that use of chemical substances such as strong acid and strong alkali is avoided, and green treatment is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an energy-saving reactor for biological treatment of industrial wastewater containing DMF. Background Art

[0002] DMF, the chemical abbreviation for N,N-dimethylformamide, is an organic compound with the chemical formula C3H7NO, a colorless, transparent liquid. It is both a widely used chemical raw material and an excellent solvent. It is miscible with water and most organic solvents and has excellent solubility for a wide range of organic and inorganic compounds. However, DMF wastewater contains high concentrations of organic matter, is biotoxic, and poses significant risks to aquatic life in rivers and ponds, posing a significant threat to the environment. Therefore, DMF wastewater must undergo effective treatment processes for purification.

[0003] Traditional purification methods are divided into distillation and Fenton oxidation:

[0004] The distillation method utilizes the difference in boiling points between DMF and water to achieve a preliminary separation of DMF and water through fractionation in a distillation tower. However, the wastewater after distillation still contains a certain concentration of DMF, requiring further treatment. Furthermore, heating the water to its boiling point consumes a significant amount of energy.

[0005] The Fenton oxidation process uses Fe 2+ It reacts with H2O2 to generate highly oxidizing hydroxyl radicals (·OH), which can efficiently oxidize DMF. However, the Fenton reaction requires strict pH control, so strong acids and bases are required. It also requires a large amount of Fe 2+ , flammable and explosive H2O2 and other strong oxidants, which will eventually produce a large amount of iron sludge, which is difficult to dispose of.

[0006] Therefore need a kind of energy-saving reactor of green processing DMF. Utility Model Content

[0007] In response to the shortcomings of the existing technology, the utility model provides an energy-saving reactor for the biological treatment of industrial wastewater containing DMF. The energy-saving reactor is used for the biological treatment of industrial wastewater containing DMF, contains sludge particles and activated carbon particles to carry the microbial community that degrades DMF, and utilizes an aerator to circulate the wastewater in the upflow zone and downflow zone divided by the sleeve to achieve degradation, and avoids the use of strong acids, strong alkalis and other chemical substances to achieve green treatment.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an energy-saving reactor for biological treatment of industrial wastewater containing DMF, comprising a cavity, a water inlet pipe being provided on the bottom side wall of the cavity, a support rod being fixedly installed inside the cavity, a sleeve being fixedly installed on the inner side of the support rod, an aerator being provided inside the cavity below the sleeve, a filter cover being fixedly installed on the top inner top of the cavity, the top of the sleeve extending to the inside of the filter cover, an exhaust valve being fixedly installed on the top inner top of the cavity, a water outlet being provided on the outer side of the top end of the cavity, the interior of the cavity being filled with activated carbon and granular sludge, and microbial flora for degrading DMF being attached to the surfaces of the activated carbon and granular sludge.

[0009] Furthermore, the aerator is a membrane aeration device, and the diameter of the aerator is the same as the diameter of the sleeve.

[0010] Furthermore, there are multiple water outlets, and the cavity is located outside the water outlet and is connected to and penetrated by a drainage ring.

[0011] Furthermore, an inverted umbrella-shaped water distribution ring is provided inside the cavity, and the water inlet pipe passes through the water distribution ring.

[0012] Furthermore, the support rod is in the shape of a triangle, and the edges of the top end of the triangular support rod are chamfered.

[0013] Furthermore, the filter cover is hemispherical in shape, and filter holes are provided in the connecting portion between the filter cover and the exhaust valve and in the side wall of the filter cover. A sealing ring fixedly connected to the cavity is fixedly mounted on the bottom edge of the filter cover.

[0014] Furthermore, a sludge discharge outlet is provided at the bottom end of the cavity, and a sealing plug is connected to the internal thread of the sludge discharge outlet.

[0015] Furthermore, the exhaust valve includes a valve body, an exhaust port is provided inside the valve body, a sealing gasket is slidably connected inside the exhaust port, and a return spring is provided between the sealing gasket and the inner wall of the valve body.

[0016] Furthermore, the outer surface of the valve body is threadedly connected to a sealing cover, the outer top end of the sealing cover is rotatably connected to a connecting ring, a through hole is opened in the sealing cover at the part covered by the connecting ring, and the sealing cover and the sealing gasket are fixedly connected by a connecting rod.

[0017] The beneficial effects of the present invention are:

[0018] 1. The energy-saving reactor for biological treatment of industrial wastewater containing DMF can be used to carry microbial communities that degrade DMF through the sludge particles and activated carbon particles provided. The wastewater is circulated through the upflow zone and downflow zone divided by the sleeve through the aerator to achieve DMF degradation, avoiding the use of strong acids, strong alkalis and other chemical substances to achieve green treatment.

[0019] 2. The energy-saving reactor for biological treatment of industrial wastewater containing DMF is provided with a sealing cover through a threaded connection on the outer surface of a valve body, a connecting ring is rotatably connected to the top end of the outer side of the sealing cover, a through hole is provided in the sealing cover where the connecting ring is covered, and the sealing cover and the sealing gasket are fixedly connected by a connecting rod. Such a setting can collect the discharged gas when the sealing cover and the valve body are separated, and squeeze the sealing gasket when the valve body and the sealing cover are connected to prevent exhaust, thereby preventing outside air from entering the cavity.

[0020] 3. This energy-saving reactor for biological treatment of DMF-containing industrial wastewater uses a membrane aerator, which has an oxygenation efficiency 100% higher than that of traditional microporous aerators. This improves the oxygen transfer rate and provides a higher concentration of dissolved oxygen (DO) for microbial metabolism. It also has an auxiliary gas lift function, which reduces the head of the water inlet pump, thereby saving energy. Operating energy consumption is reduced by more than 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a half-section schematic diagram of the utility model;

[0022] Figure 2 This is a half-section schematic diagram of the filter cover of the utility model;

[0023] Figure 3 This is a half-section schematic diagram of the exhaust valve of the utility model;

[0024] Figure 4 This is a half-section schematic diagram of the cavity of the utility model;

[0025] Figure 5 This is a schematic diagram of the sleeve connection of the utility model.

[0026] Among them, 1. Cavity; 2. Water inlet pipe; 3. Support rod; 4. Sleeve; 5. Aerator; 6. Filter cover; 7. Exhaust valve; 8. Water outlet; 9. Drain ring; 10. Water distribution ring; 11. Filter hole; 12. Sealing ring; 13. Sludge discharge outlet; 14. Sealing plug; 701. Valve body; 702. Sealing gasket; 703. Return spring; 704. Sealing cover; 705. Connecting ring; 706. Through hole; 707. Connecting rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See Figure 1-Figure 5 , an energy-saving reactor for biological treatment of industrial wastewater containing DMF, comprising a cavity 1, an instrument detection port is provided at the top of the cavity 1, a water inlet pipe 2 is provided on the side wall of the bottom end of the cavity 1, a support rod 3 is fixedly installed inside the cavity 1, a sleeve 4 is fixedly installed on the inner side of the support rod 3, the cavity 1 is divided into an inner upflow area and an outer downflow area by the sleeve 4, an aerator 5 is provided below the sleeve 4 inside the cavity 1, a filter cover 6 is fixedly installed at the top of the cavity 1, the top of the sleeve 4 extends to the inside of the filter cover 6, an exhaust valve 7 is fixedly installed at the top of the cavity 1, the position of the filter cover 6 is a three-phase separation area, a water outlet 8 is provided on the outside of the top of the cavity 1, the interior of the cavity 1 is filled with activated carbon and granular sludge, and microbial flora that degrade DMF is attached to the surface of the activated carbon and granular sludge.

[0029] Aerator 5 is a membrane aeration device with an oxygenation efficiency 3-4 times that of traditional microporous aerators, which improves the oxygen transfer rate and provides a higher concentration of dissolved oxygen (DO) for microbial metabolism. It also has an auxiliary function of gas lift, reducing the head of the water inlet pump, thereby saving energy. Operating energy consumption is reduced by more than 30%.

[0030] The diameter of the aerator 5 is the same as that of the sleeve 4. It provides sufficient oxygen for microbial degradation and provides aerodynamic force for the rise of wastewater, so that the mixed liquid in the upflow zone continues to flow upward and fully contacts the columnar activated carbon particles suspended in the water, and the granular sludge with high biomass concentration, high organic load resistance and low sludge swelling.

[0031] There are multiple water outlets 8, and the cavity 1 is located on the outside of the water outlet 8 and is connected to and penetrated by a drainage ring 9. Through such an arrangement, water can be discharged evenly, making the water discharge efficiency higher.

[0032] An inverted umbrella-shaped water distribution ring 10 is set inside the cavity 1. The water inlet pipe 2 passes through the water distribution ring 10. The wastewater hits the surface of the water distribution ring 10 through the water inlet pipe 2 to form a vortex, spirally rises, and enters the upflow area. During the rising process, the wastewater is fully in contact with the air provided by the aerator 5.

[0033] The support rod 3 is in the shape of a triangle, and the edges of the top end of the triangular support rod 3 are chamfered. This arrangement can prevent activated carbon and sludge particles from accumulating on the support rod 3.

[0034] The filter cover 6 is hemispherical in shape, and filter holes 11 are provided in the connecting portion between the filter cover 6 and the exhaust valve 7 and in the side wall of the filter cover 6. A sealing ring 12 fixedly connected to the cavity 1 is fixedly installed on the bottom edge of the filter cover 6. This arrangement enables three-phase separation.

[0035] A sludge discharge port 13 is provided at the bottom end of the cavity 1 , and a sealing plug 14 is connected to the internal thread of the sludge discharge port 13 . This arrangement facilitates the discharge of sludge and activated carbon while maintaining sealing.

[0036] The exhaust valve 7 includes a valve body 701, an exhaust port is provided inside the valve body 701, a sealing gasket 702 is slidably connected to the inside of the exhaust port, and a return spring 703 is provided between the sealing gasket 702 and the inner wall of the valve body 701. Through such a setting, the sealing gasket 702 can be lifted up under the action of gas pressure to achieve exhaust.

[0037] The outer surface of the valve body 701 is threadedly connected to a sealing cover 704, and the outer top end of the sealing cover 704 is rotatably connected to a connecting ring 705. The sealing cover 704 is provided with a through hole 706 at the part covered by the connecting ring 705. The sealing cover 704 and the sealing gasket 702 are fixedly connected by a connecting rod 707. Through such an arrangement, the discharged gas can be collected when the sealing cover 704 and the valve body 701 are separated, and the sealing gasket 702 can be squeezed when the valve body 701 is connected to the sealing cover 704 to prevent exhaust.

[0038] During use, the water inlet pipe 2 passes through the water distribution ring 10, and the wastewater impacts the surface of the water distribution ring 10 through the water inlet pipe 2 to form a vortex, spirally rises, and enters the upflow area. During the rising process, the wastewater is fully in contact with the air provided by the aerator 5, and the activated carbon suspended in the water and the microbial community attached to the surface of the granular sludge degrade DMF. When the wastewater, carrying the suspended carrier and granular sludge, rises to the solid-liquid-gas three-phase separation zone at the top of chamber 1, aeration gas, solid particles, and liquid separate here. Gas overflows from exhaust valve 7, and the supernatant is discharged from outlet 8. Some solid particles enter the downflow zone, while others descend back to the upflow zone. When the liquid level suddenly expands, the aeration function weakens, and the residual aeration gas overflows, the upward flow rate of the wastewater approaches zero. At this time, due to the density difference, some activated carbon and granular sludge descend to the bottom of the upflow zone under the action of gravity, undergoing a new round of upward reaction. Some activated carbon and granular sludge with flow kinetic energy enter the downflow zones on both sides along with the wastewater, and finally circulate with the wastewater to the new upflow zone for further biodegradation. The downflowing wastewater in the downflow zone also circulates and dilutes the incoming wastewater, reducing the impact of the wastewater on the system. The mixed liquid circulates from the upflow zone to the downflow zone and then to the upflow zone, achieving biodegradation of DMF.

[0039] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0040] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An energy-saving reactor for biological treatment of industrial wastewater containing DMF, comprising a chamber (1), characterized in that: The bottom side wall of the cavity (1) is provided with a water inlet pipe (2), a support rod (3) is fixedly installed inside the cavity (1), a sleeve (4) is fixedly installed on the inner side of the support rod (3), an aerator (5) is provided inside the cavity (1) below the sleeve (4), a filter cover (6) is fixedly installed on the top end of the cavity (1), the top end of the sleeve (4) extends to the inside of the filter cover (6), an exhaust valve (7) is fixedly installed on the top end of the cavity (1), a water outlet (8) is provided on the outer side of the top end of the cavity (1), and the interior of the cavity (1) is filled with activated carbon and granular sludge, and microbial flora that degrade DMF is attached to the surfaces of the activated carbon and granular sludge.

2. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 1, characterized in that: The aerator (5) is a membrane aeration device, and the diameter of the aerator (5) is the same as the diameter of the sleeve (4).

3. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 2, characterized in that: There are multiple water outlets (8), and the cavity (1) is located outside the water outlets (8) and is connected to and penetrated by a drainage ring (9).

4. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 1, characterized in that: An inverted umbrella-shaped water distribution ring (10) is provided inside the cavity (1), and the water inlet pipe (2) passes through the water distribution ring (10).

5. An energy-saving reactor for biological treatment of industrial wastewater containing DMF according to any one of claims 1 to 4, characterized in that: The support rod (3) is in the shape of a triangle, and the edges of the top ends of the triangular support rod (3) are chamfered.

6. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 5, characterized in that: The filter cover (6) is hemispherical in shape, and a filter hole (11) is provided in the portion connecting the filter cover (6) and the exhaust valve (7) and in the side wall of the filter cover (6). A sealing ring (12) fixedly connected to the cavity (1) is fixedly mounted on the bottom edge of the filter cover (6).

7. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 1, characterized in that: The bottom end of the cavity (1) is provided with a sludge discharge outlet (13), and the internal thread of the sludge discharge outlet (13) is connected to a sealing plug (14).

8. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 5, characterized in that: The exhaust valve (7) comprises a valve body (701), an exhaust port is provided inside the valve body (701), a sealing gasket (702) is slidably connected inside the exhaust port, and a return spring (703) is provided between the sealing gasket (702) and the inner wall of the valve body (701).

9. The energy-saving reactor for biological treatment of industrial wastewater containing DMF according to claim 8, characterized in that: The outer surface of the valve body (701) is threadedly connected to a sealing cover (704), and the outer top end of the sealing cover (704) is rotatably connected to a connecting ring (705). The sealing cover (704) is provided with a through hole (706) at the portion covered by the connecting ring (705), and the sealing cover (704) and the sealing gasket (702) are fixedly connected via a connecting rod (707).

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