Integrated sewage treatment device combining air floatation, AO-MBBR and inclined tube sedimentation

Abstract

The application discloses a kind of "air floatation, AO-MBBR, inclined tube precipitation" combined integrated sewage treatment device.The device at least includes air floatation unit, AO-MBBR unit, inclined tube precipitation unit that are integrally arranged in series.The air floatation unit includes mixing chamber, flocculation chamber, contact chamber, separation chamber and effluent chamber arranged in series.The AO-MBBR unit includes first anoxic chamber, second anoxic chamber, aerobic chamber and effluent well.The inclined tube precipitation unit includes mixing chamber, flocculation chamber, sedimentation chamber, sludge hopper and effluent chamber.The application uses "air floatation, AO-MBBR, inclined tube precipitation" combined process, can effectively remove various pollutants, with high removal efficiency, to meet the requirements of multiple water quality treatment;With high degree of automation, simple operation.PLC control system is provided for the equipment, to realize automatic control of water intake booster pump, pressure gas dissolving system, aeration system, dosing system and the like.

Description

Technical Field

[0001] This invention relates to an integrated wastewater treatment device based on the combined use of "air flotation, AO-MBBR, and inclined tube sedimentation". Background Technology

[0002] With the continuous advancement of comprehensive water environment management in my country's river basins, effective treatment of long-term and sudden river water pollution must be ensured before black and odorous water bodies can be completely eliminated. Integrated sewage treatment equipment is flexible in its setup, can be transported to different locations, and can effectively and promptly respond to various water pollution emergencies.

[0003] Air flotation primarily utilizes microbubbles generated by a dissolved air system in the dissolved air water. These microbubbles adhere to suspended flocs in the water, causing the suspended solids to rise to the surface with the microbubbles, forming scum and thus removing the suspended flocs. Inclined tube sedimentation involves dividing the sedimentation zone into a series of shallow sedimentation layers using inclined parallel tubes, thereby increasing the treatment capacity of the sedimentation tank. Moving-bed biofilm reactors (MBBRs) are a typical process widely used in various integrated wastewater treatment systems. The core of an MBBR is the direct addition of suspended packing material with a specific gravity close to that of water into the aeration tank as an active carrier for microorganisms. Relying on aeration and water flow within the aeration tank, the microorganisms are in a fluidized state. This process combines the suspended growth of activated sludge with the attached growth of biofilm, resulting in a high volumetric loading rate.

[0004] In existing wastewater treatment equipment, each process unit uses independent equipment, and the overall structure is not integrated. Therefore, it occupies a large area, is relatively complex to install, and requires integration with civil engineering design. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an integrated wastewater treatment device based on a combined process of "air flotation, AO-MBBR, and inclined tube sedimentation". This device employs an integrated equipment, utilizing air flotation to remove suspended particles from the influent, AO-MBBR as a biological treatment process for the oxidative decomposition of organic matter, and inclined tube sedimentation for efficient sludge-water separation.

[0006] To achieve the above objectives, the integrated wastewater treatment device combining air flotation, AO-MBBR, and inclined tube sedimentation of the present invention is characterized in that: the device includes at least an air flotation unit, an AO-MBBR unit, and an inclined tube sedimentation unit arranged in series.

[0007] The air flotation unit includes a mixing chamber, a flocculation chamber, a contact chamber, a separation chamber, and an effluent chamber arranged in series.

[0008] The AO-MBBR unit includes: a first anoxic chamber, a second anoxic chamber, an aerobic chamber, and an effluent well;

[0009] The inclined tube sedimentation unit includes: a mixing chamber, a flocculation chamber, a sedimentation chamber, a sludge hopper, and an effluent chamber.

[0010] Furthermore, a slag scraper and a slag discharge trough are installed at the top of the separation chamber of the air flotation unit; the slag discharge trough is equipped with a slag discharge pipe;

[0011] The water outlet chamber is connected to the AO-MBBR unit through a hole.

[0012] Furthermore, aeration components are installed at the bottom of the first and second anoxic chambers in the AO-MBBR unit.

[0013] Furthermore, suspended packing material is added to the aerobic chamber of the AO-MBBR unit; an aeration assembly is installed at the bottom of the aerobic chamber and connected to the aeration equipment via an aeration pipe; the effluent from the aerobic chamber falls to the effluent well through a triangular weir; the effluent well is equipped with a nitrification liquid return pipe; the nitrification liquid return pipe returns the effluent to the first anoxic chamber using airlift return.

[0014] Furthermore, the aerobic chamber in the AO-MBBR unit is equipped with a packing screen for intercepting water through the inlet holes and the outlet triangular weir.

[0015] Furthermore, the mixing chamber of the inclined tube sedimentation unit is equipped with air agitation; the flocculation chamber is equipped with a flocculation agitator; the upper part of the sedimentation chamber is equipped with inclined tubes / plates; the effluent from the sedimentation chamber falls to the effluent chamber through a triangular weir; the bottom of the sludge hopper is equipped with a perforated static pressure sludge discharge pipe and a sludge return pipe; the sludge return pipe returns the sludge to the first anoxic chamber using air lift reflux; the effluent chamber is equipped with an effluent pipe and a pressurized dissolved air inlet pipe.

[0016] Furthermore, a sludge temporary storage unit is integrally provided on one side of the inclined tube sedimentation unit; the sludge temporary storage unit includes: a mixer and a discharge pipe; the venting and sludge discharge pipes of the air flotation unit, AO-MBBR unit, and inclined tube sedimentation unit are all connected to the sludge temporary storage unit.

[0017] Furthermore, it also includes an equipment room that is integrated with the aforementioned air flotation unit, AO-MBBR unit, and inclined tube sedimentation unit. The equipment room includes: air flotation equipment, aeration equipment, dosing equipment, and control system.

[0018] Furthermore, the air flotation equipment includes: an air compressor, a pressurized water pump, and a dissolved air tank; the air compressor and the pressurized water pump are both connected to the dissolved air tank; the dissolved air tank is connected to the dissolved air release device of the air flotation unit; the pressurized water pump takes water from the outlet chamber of the inclined tube sedimentation unit; the dosing equipment includes: a PAC dosing system and a PAM dosing system.

[0019] Furthermore, the aeration equipment is connected to the air stirring pipe of the mixing chamber of the air flotation unit, the first anoxic chamber and the second anoxic chamber of the AO-MBBR unit, the aeration components of the aerobic tank, the air inlet pipe of the nitrification liquid return pipe of the effluent well of the AO-MBBR unit, the air stirring pipe of the mixing chamber of the inclined tube sedimentation unit, and the sludge return air inlet pipe of the sludge hopper of the inclined tube sedimentation unit.

[0020] In the aforementioned dosing equipment, the PAC dosing system is connected to the mixing chamber of the air flotation unit and the mixing chamber of the inclined tube sedimentation unit, while the PAM dosing system is connected to the flocculation chamber of the air flotation unit and the flocculation chamber of the inclined tube sedimentation unit.

[0021] The present invention has the following advantages:

[0022] (1) The combined process of "air flotation, AO-MBBR and inclined tube sedimentation" can effectively remove a variety of pollutants with high removal efficiency, meeting the requirements for multiple water quality treatments.

[0023] (2) The air flotation unit performs pretreatment, which has a higher separation efficiency than ordinary sedimentation. It is equipped with a mixing chamber and a flocculation chamber, and the dosage can be adjusted according to the actual concentration of suspended solids in the influent to enable effective air flotation separation.

[0024] (3) The AO-MBBR unit performs organic biodegradation. Adding suspended filler helps to increase the volumetric load, and different impact loads can be addressed by adjusting the filler addition rate.

[0025] (4) The inclined tube sedimentation unit performs efficient mud-water separation and is equipped with a mixing chamber and a flocculation chamber. The dosage can be adjusted according to the chemical phosphorus removal requirements.

[0026] (5) Flexible operation mode with denitrification function. Considering the denitrification capacity, two anoxic chambers are set up before the aerobic chamber of the MBBR. On the one hand, it can be operated as an anoxic tank, and denitrification is carried out by stripping the nitrified liquid; on the other hand, it can be operated as an aerobic tank, which can fully increase the residence time of the equipment.

[0027] (6) High degree of integration and easy to use. The equipment integrates pretreatment, secondary biological treatment, sludge storage, and auxiliary equipment such as pressure dissolved air system, aeration system, dosing system, and PLC control system. The whole machine is small in size, light in weight, low in cost, and easy to install and debug.

[0028] (7) High degree of automation and simple operation. The equipment is equipped with a PLC control system to realize automatic control of the influent booster pump, pressure dissolved air system, aeration system, and chemical dosing system. Attached Figure Description

[0029] Figure 1 This is a plan view of an embodiment of the integrated wastewater treatment device of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the cross-section of the air flotation unit;

[0031] Figure 3 for Figure 1 Schematic diagram of the cross section of the AO-MBBR unit;

[0032] Figure 4 for Figure 1 Schematic diagram of cross-section of the inclined tube sedimentation unit.

[0033] Wherein: A—Air flotation unit (including: a—mixing chamber, b—flocculation chamber, c—contact chamber, d—separation chamber, e—sludge hopper, f—sludge discharge trough, g—effluent chamber); B—AO-MBBR unit (including: h1—first anoxic chamber, h2—second anoxic chamber, i—aerobic chamber, j—effluent well); C—Inclined tube sedimentation unit (including: k—mixing chamber, l—flocculation chamber, m—sedimentation chamber, n—sludge hopper, o—effluent chamber); D—sludge temporary storage unit; E—equipment room.

[0034] 1—Electromagnetic flowmeter; 2—Inlet pipe; 3—Air mixing pipe; 4—Flocculation mixer; 5—Dissolved gas release device; 6—Sludge scraper; 7—Perforated static pressure sludge discharge pipe; 8—Perforated water collection pipe; 9—Sludge discharge pipe; 10—Aeration pipe; 11—Aeration assembly; 12—Interception screen; 13—Suspended packing; 14—AO-MBBR unit aerobic chamber effluent triangular weir; 15—Nitrified liquor return pipe; 16—Nitrified liquor return airlift inlet pipe; 17—Inclined tube / plate; 18—Sludge 19—Sludge return airlift inlet pipe; 20—Triangular weir for effluent from sedimentation chamber of inclined tube sedimentation unit; 21—Effluent pipe; 22—Pressurized dissolved air inlet pipe; 23—Ventilation and sludge discharge pipe; 24—Sludge temporary storage unit discharge pipe; 25—Pressurized water pump; 26—Dissolved air tank; 27—Air compressor; 28—Pressurized dissolved air outlet pipe; 29—Aeration equipment; 30—PAC dosing system; 31—PAM dosing system; 32—Control system; 33—Equipment room inlet / outlet. Detailed Implementation

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] One embodiment of the present invention, such as Figures 1-4 As shown, the integrated wastewater treatment device of the present invention, based on the combined process of "air flotation, AO-MBBR, and inclined tube sedimentation", includes: air flotation unit A, AO-MBBR unit B, inclined tube sedimentation unit C, sludge temporary storage unit D, and equipment room E. The overall working process of the device is as follows: wastewater is metered by electromagnetic flowmeter 1 and then transported to air flotation unit A through inlet pipe 2, where suspended particles in the inlet water are removed by air flotation; the effluent after air flotation unit A enters AO-MBBR unit B through holes for the oxidation and decomposition of organic matter; the wastewater after AO-MBBR unit B enters inclined tube sedimentation unit C through holes for efficient sludge-water separation; the effluent after inclined tube sedimentation unit C is discharged through effluent pipe 21.

[0040] Wastewater enters the flotation unit A, passing sequentially through mixing chamber a, flocculation chamber b, contact chamber c, separation chamber d, and effluent chamber g. In mixing chamber a, the wastewater mixes with PAC; in flocculation chamber b, it flocculates with PAM. Suspended particles in the wastewater adhere to microbubbles generated by dissolved air in contact chamber c and rise to the water surface. The scum rising to the surface is scraped to the scum discharge trough f by scraper 6 in separation chamber d. Wastewater is collected in effluent chamber g through perforated collection pipe 8. Bottom sediment falls into sludge hopper e and is discharged to sludge temporary storage unit D through perforated static pressure sludge discharge pipe 8, venting, and sludge discharge pipe 23. Wastewater is connected to AO-MBBR unit B through holes in effluent chamber g. The mixing chamber a is equipped with an air stirring pipe 3 for adding PAC; the flocculation chamber b is equipped with a flocculation mixer 4 for adding PAM; the contact chamber c is equipped with a dissolved gas release device 5; the separation chamber d is equipped with a scraper 6 at the top and a perforated water collection pipe 8 in the middle; the sludge hopper e is equipped with a perforated static pressure sludge discharge pipe 7 at the bottom; and the sludge discharge trough f is equipped with a sludge discharge pipe 9.

[0041] Wastewater enters AO-MBBR unit B and sequentially passes through the first anoxic chamber h1, the second anoxic chamber h2, the aerobic chamber i, and the effluent well j. In the first and second anoxic chambers h1 and h2, denitrification removes nitrate nitrogen. The effluent from the second anoxic chamber h2 enters the aerobic chamber i through holes. Suspended packing material 13 is added to the aerobic chamber i, and aeration is achieved through aeration components 11. Microorganisms attached to the suspended packing material 13 perform biodegradation and nitrification of organic pollutants. After a certain retention time, the wastewater in the aerobic chamber i falls through a triangular weir 14 to the effluent well j. The nitrified liquid in the effluent well j is then airlifted through the nitrified liquid return pipe 15 to the first anoxic chamber h1 for denitrification. The effluent from the effluent well j enters the inclined tube sedimentation tank C through holes. The first anoxic chamber h1 and the second anoxic chamber h2 are equipped with aeration components 11 at the bottom, which are normally not turned on. When sludge accumulates at the bottom, air agitation is used to prevent sludge deposition. Alternatively, when the effluent TN requirement is low, the aeration components at the bottom of the first and second anoxic chambers can be turned on to increase the aerobic volume. Suspended packing material 13 is added to the aerobic chamber i. The aeration components 11 at the bottom of the aerobic chamber i are connected to the aeration equipment 29 via aeration pipes 10. The effluent well j is equipped with a nitrification liquid return pipe 15. The nitrification liquid return pipe 15 is connected to the nitrification liquid return air lift inlet pipe 16. The aeration components 11 are EPDM disc aerators. The suspended packing material is made of HDPE. The inlet holes and effluent triangular weir 14 of the aerobic chamber are equipped with packing interception screens 12.

[0042] Wastewater enters the inclined tube sedimentation unit C, passing sequentially through the mixing chamber k, flocculation chamber l, sedimentation chamber m, and effluent chamber o. In the mixing chamber k, wastewater is mixed with PAC, and in the flocculation chamber l, it undergoes flocculation with PAM. The detached biofilm in the wastewater undergoes efficient sludge-water separation in the sedimentation chamber m via inclined tubes / plates 17. The supernatant falls into the effluent chamber o through a triangular weir 20. The sludge settles and falls into the sludge hopper n; part of it is airlifted to the first anoxic chamber h1 via the sludge return pipe 18, and the other part is discharged to the sludge temporary storage unit D via the perforated static pressure sludge discharge pipe 8, venting, and sludge discharge pipe 23. The treated wastewater is discharged through the effluent pipe 21. The mixing chamber k is equipped with an air stirring pipe 3 for adding PAC; the flocculation chamber l is equipped with a flocculation mixer 4 for adding PAM; the sedimentation chamber m is equipped with an inclined tube / plate in the upper part; the sludge hopper n is equipped with a perforated static pressure sludge discharge pipe 8 and a sludge return pipe 18 at the bottom; the sludge return pipe 18 is connected to the sludge return air lift inlet pipe 19; the effluent chamber o is equipped with an effluent pipe 21 and a pressurized dissolved air inlet pipe 22.

[0043] The sludge temporary storage unit D is equipped with a mixer 32 and a discharge pipe 24; the venting and sludge discharge pipes 23 of the air flotation unit A, AO-MBBR unit B, and inclined tube sedimentation unit C are all connected to the sludge temporary storage unit D.

[0044] The equipment room E includes: air flotation equipment, aeration equipment, dosing equipment, and control system.

[0045] The air flotation equipment includes: an air compressor 27, a pressurized water pump 25, and a dissolved air tank 26;

[0046] The dosing equipment includes: PAC dosing system 30 and PAM dosing system 32.

[0047] The air compressor 27 and the pressurized water pump 25 are both connected to the dissolved air tank 26; the water inlet of the pressurized water pump 25 is taken from the outlet chamber o of the inclined tube sedimentation unit C through the pressurized dissolved air inlet pipe 22; the dissolved air tank 26 is connected to the dissolved air release device c of the air flotation unit A through the pressurized dissolved air outlet pipe 28.

[0048] The aeration device 29 is connected to the air stirring pipe 3 of the mixing chamber a of the air flotation unit A, the first anoxic chamber h1 and the second anoxic chamber h2 of the AO-MBBR unit B, the aeration component 11 of the aerobic tank i, the effluent well j of the AO-MBBR unit B, the nitrification liquid return air lift inlet pipe 16, the air stirring pipe 3 of the mixing chamber k of the inclined tube sedimentation unit C, and the sludge hopper n of the inclined tube sedimentation unit C, which is connected to the sludge return air lift inlet pipe 19.

[0049] The PAC dosing system 30 is connected to the mixing chamber a of the air flotation unit A and the mixing chamber k of the inclined tube sedimentation unit C, and the PAM dosing system is connected to the flocculation chamber b of the air flotation unit A and the flocculation chamber l of the inclined tube sedimentation unit C.

[0050] The control system 32 is controlled by a PLC.

[0051] It should be noted that all connecting pipes must be equipped with the necessary valves.

[0052] The above description is only a specific implementation of the present invention under the "mud membrane method" operation. In actual practice, the following can be determined according to the specific water quality: (1) whether to add chemicals to the air flotation unit and inclined tube sedimentation unit; (2) whether to aerate the first and second anoxic chambers of the AO-MBBR unit; (3) whether to add packing material to the first and second anoxic chambers of the AO-MBBR unit; (4) the packing material filling rate of the AO-MBBR unit; (5) whether to operate the AO-MBBR unit using the "mud membrane method" or the "pure membrane method"; and (6) whether to perform nitrification liquor recirculation or sludge recirculation. Therefore, the present invention is not limited to the above implementation. Within the knowledge of those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0053] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated wastewater treatment device combining air flotation, AO-MBBR, and inclined tube sedimentation, characterized in that: The device includes at least an air flotation unit, an AO-MBBR unit, and an inclined tube sedimentation unit arranged in series. The air flotation unit includes a mixing chamber, a flocculation chamber, a contact chamber, a separation chamber, and an effluent chamber arranged in series. The AO-MBBR unit includes: a first anoxic chamber, a second anoxic chamber, an aerobic chamber, and an effluent well; The inclined tube sedimentation unit includes: a mixing chamber, a flocculation chamber, a sedimentation chamber, a sludge hopper, and an effluent chamber; Aeration components are installed at the bottom of the first and second anoxic chambers in the AO-MBBR unit. The AO-MBBR unit contains suspended packing material in its aerobic chamber; an aeration assembly is installed at the bottom of the aerobic chamber and connected to an aeration device via an aeration pipe; the effluent from the aerobic chamber falls to the effluent well via a triangular weir; the effluent well is equipped with a nitrification liquid return pipe; the nitrification liquid return pipe returns the effluent to the first anoxic chamber using airlift return; The aerobic chamber in the AO-MBBR unit is equipped with a packing screen for intercepting water through the inlet holes and the outlet triangular weir. The mixing chamber of the inclined tube sedimentation unit is equipped with air agitation; the flocculation chamber is equipped with a flocculation agitator; the upper part of the sedimentation chamber is equipped with inclined tubes / plates; the effluent from the sedimentation chamber falls to the effluent chamber through a triangular weir; the bottom of the sludge hopper is equipped with a perforated static pressure sludge discharge pipe and a sludge return pipe; the sludge return pipe returns the sludge to the first anoxic chamber using air lift reflux; the effluent chamber is equipped with an effluent pipe and a pressurized dissolved air inlet pipe. A sludge temporary storage unit is integrally provided on one side of the inclined tube sedimentation unit; the sludge temporary storage unit includes: a mixer and a discharge pipe; the venting and sludge discharge pipes of the air flotation unit, AO-MBBR unit and inclined tube sedimentation unit are all connected to the sludge temporary storage unit. It also includes an equipment room that is integrated with the air flotation unit, AO-MBBR unit and inclined tube sedimentation unit. The equipment room includes: air flotation equipment, aeration equipment, dosing equipment and control system. The air flotation equipment includes: an air compressor, a pressurized water pump, and a dissolved air tank; the air compressor and the pressurized water pump are both connected to the dissolved air tank; the dissolved air tank is connected to the dissolved air release device of the air flotation unit; the pressurized water pump takes water from the outlet chamber of the inclined tube sedimentation unit; the dosing equipment includes: a PAC dosing system and a PAM dosing system; The aeration equipment is connected to the air stirring pipe of the mixing chamber of the air flotation unit, the first anoxic chamber and the second anoxic chamber of the AO-MBBR unit, the aeration components of the aerobic tank, the air inlet pipe of the nitrified liquid return pipe of the effluent well of the AO-MBBR unit, the air stirring pipe of the mixing chamber of the inclined tube sedimentation unit, and the sludge return air inlet pipe of the sludge hopper of the inclined tube sedimentation unit. In the aforementioned dosing equipment, the PAC dosing system is connected to the mixing chamber of the air flotation unit and the mixing chamber of the inclined tube sedimentation unit, and the PAM dosing system is connected to the flocculation chamber of the air flotation unit and the flocculation chamber of the inclined tube sedimentation unit.

2. The integrated wastewater treatment device combining air flotation, AO-MBBR, and inclined tube sedimentation as described in claim 1, characterized in that, A sludge scraper and a sludge discharge trough are installed at the top of the separation chamber of the air flotation unit; the sludge discharge trough is equipped with a sludge discharge pipe; the water outlet chamber is connected to the AO-MBBR unit through a hole.

Images