MFBR and granular active carbon biological treatment combined sewage treatment device

Abstract

The utility model discloses an MFBR (Membrane Factor Bactor) and granular active carbon biological treatment combined sewage treatment device which comprises an anoxic zone, an anaerobic zone, an MFBR aerobic zone, a granular active carbon biological reaction zone and a settling zone which are sequentially connected along the flowing direction of water flow, and the granular active carbon biological reaction zone is communicated with the anoxic zone through a nitrification liquid reflux device; and the settling zone is communicated with the settling zone through a sludge reflux device. By adopting the MFBR and granular active carbon biological treatment combined sewage treatment device disclosed by the invention, the nitrogen and phosphorus removal effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment device combining MFBR and granular activated carbon biological treatment. Background Art

[0002] Biological wastewater treatment uses pollutants in wastewater as a nutrient source, utilizing the metabolic activity of microorganisms to degrade them and purify the wastewater. Biological denitrification and phosphorus removal primarily involves a recirculation process, utilizing microorganisms in anoxic and / or anaerobic environments to remove nitrogen and phosphorus from water. This process places high demands on DO (dissolved oxygen) control.

[0003] At present, nitrification liquid is usually directly returned from the aerobic tank to the anoxic tank or anaerobic tank. The disadvantage of this method is that the dissolved oxygen in the nitrification liquid is brought back to the anoxic and anaerobic sections, and the anaerobic and anoxic states cannot be guaranteed. Especially for integrated equipment, the sewage treatment volume is small, and the return volume can reach 100%-400%, resulting in the anoxic and anaerobic zones being directly replaced by the nitrification liquid, causing the entire set of equipment to be in an aerobic state, seriously affecting the effect of denitrification, denitrification and phosphorus removal.

[0004] To overcome the above problems, Chinese patent CN112358051A discloses an integrated sewage recycling and reflow deoxygenation treatment device. By providing a deoxygenation tank, the nitrified liquid is deoxygenated in the deoxygenation tank and then recirculated into the anoxic tank. Although this improves the dissolved oxygen concentration required for denitrification in the anoxic tank to a certain extent, it still has the following disadvantages: the nitrified liquid flows through the deoxygenation tank in a relatively direct flow state. Due to the volume of the deoxygenation tank, the nitrified liquid has a limited residence time in the deoxygenation tank, which to a certain extent affects the deoxygenation effect of the deoxygenation tank on the nitrified liquid. Chinese patent CN1903744A improves the UCT process device, in which the effluent from the aerobic reactor is stirred and deoxygenated in the deoxygenation reactor before being recirculated. Chinese patent CN101104541A improves the four-stage water inlet A / O deep denitrification device, which provides a post-anoxic zone that also serves as a deoxygenation zone at the end of the traditional four-stage water inlet A / O system, where no aeration is performed and only anoxic stirring is performed. However, the oxygen in the aerobic section is uniformly dissolved in the water, and stirring alone only releases a small amount of oxygen, which is difficult to meet the requirements of the anoxic and anaerobic sections, resulting in unsatisfactory results. Therefore, the existing wastewater treatment process for nitrogen and phosphorus removal through reflux is difficult to achieve the designed effect in actual operation. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a sewage treatment device combining MFBR with granular activated carbon biological treatment to improve the nitrogen and phosphorus removal effects.

[0006] The utility model solves the above problems through the following technical means:

[0007] A sewage treatment device combining MFBR and granular activated carbon biological treatment comprises an anoxic zone, an anaerobic zone, an MFBR aerobic zone, a granular activated carbon biological reaction zone and a sedimentation zone which are sequentially connected in the direction of water flow. The granular activated carbon biological reaction zone is connected to the anoxic zone via a nitrification liquid reflux device, and the sedimentation zone is connected to the sedimentation zone via a sludge reflux device.

[0008] Furthermore, a paddle stirrer is provided in the granular activated carbon biological reaction zone, and an upper paddle blade and a lower paddle blade are installed on a stirring shaft of the paddle stirrer.

[0009] Furthermore, the upper blades are turbine blades, and the lower blades are frame blades or anchor blades.

[0010] Furthermore, a submersible mixer is provided in the anoxic zone.

[0011] Furthermore, a submersible mixer is also provided in the anaerobic zone.

[0012] Furthermore, an aeration system is provided in the aerobic zone of the MFBR.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The MFBR and granular activated carbon biological treatment combined sewage treatment equipment of the present application arranges a granular activated carbon biological reaction zone at the rear end of the MFBR aerobic zone. The granular activated carbon in the granular activated carbon biological reaction zone can adsorb DO in the sewage in the MFBR aerobic zone, thereby reducing the DO in the reflux nitrification liquid, meeting the front-end anoxic and anaerobic reaction requirements, and improving the system's denitrification and phosphorus removal efficiency.

[0015] 2. The MFBR and granular activated carbon biological treatment combined sewage treatment equipment of the present application has an additional granular activated carbon biological reaction zone, which can achieve aerobic reaction without aeration. It can also carry out biochemical reaction at the same time, which can shorten the reaction time of the previous MFBR aerobic zone and thus does not increase the overall reaction time. At the same time, because the activated carbon can adsorb microorganisms, DO and organic matter, that is, biochemical reactions can be achieved inside the particles, effectively achieving the removal of difficult-to-degrade organic matter. Furthermore, the granular activated carbon can also be regenerated through this process.

[0016] 3. The nitrification liquid reflux is set in the granular activated carbon biological reaction zone. The granular activated carbon biological reaction zone uses granular activated carbon combined with multi-layer blades for stirring. The lower blades use frame-type or anchor-type blades to prevent the granular activated carbon from settling and improve the mass transfer efficiency; the upper blades use turbine-type blades to quickly separate the sludge and activated carbon, preventing the activated carbon from entering the sedimentation tank with the sewage, and the loss rate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0022] like Figure 1 As shown, this embodiment provides a sewage treatment device combining MFBR and granular activated carbon biological treatment, including an anoxic zone 1, an anaerobic zone 2, an MFBR aerobic zone 3, a granular activated carbon biological reaction zone 4 and a sedimentation zone 5 connected in sequence according to the flow direction of the water, and the water flows back through each zone; an aeration system 10 is provided in the MFBR aerobic zone; and submersible mixers 6 are provided in both the anoxic zone and the anaerobic zone to achieve stirring and deoxygenation.

[0023] The granular activated carbon bioreactor zone is connected to the anoxic zone via a nitrification liquid return device 11, and the sedimentation zone is connected to the sedimentation zone via a sludge return device 12. Both the nitrification liquid return device and the sludge return device include pipelines and corresponding valve and pump control structures. This is prior art and will not be described in detail. By arranging the granular activated carbon bioreactor zone downstream of the MFBR aerobic zone, the granular activated carbon in the granular activated carbon bioreactor zone can absorb DO from the MFBR aerobic zone wastewater, thereby reducing DO in the recirculated nitrification liquid, meeting the front-end anoxic and anaerobic reaction requirements, and improving the system's denitrification and phosphorus removal efficiency.

[0024] A paddle stirrer 7 is provided in the granular activated carbon biological reaction zone, and an upper paddle blade 8 and a lower paddle blade 9 are installed on the stirring shaft of the paddle stirrer. The upper paddle blade is a turbine blade, and the lower paddle blade is a frame or anchor blade. The granular activated carbon biological reaction zone uses granular activated carbon combined with multiple layers of blades for stirring, and the lower paddle blade is a frame or anchor blade to prevent the granular activated carbon from settling and improve the mass transfer efficiency. The upper paddle is a turbine blade, which can quickly separate the sludge and the activated carbon, prevent the activated carbon from entering the sedimentation tank with the sewage, and has a low loss rate.

[0025] In order to verify the treatment effect of the device, the device was used in a village in Hunan Province to treat rural domestic sewage in Hunan Province with an inlet volume of 50m 3 / d, debug the equipment to form biofilm, and continuously feed water for treatment after the filler successfully forms biofilm. Adjust the DO of the aerobic zone of MFBR to 2-4 mg / L. Without adding granular activated carbon, the DO of the anoxic and anaerobic zones has been maintained at about 2 mg / L. The anoxic and anaerobic zones have not played the role of biological denitrification and phosphorus removal at all; add granular activated carbon at the rear end of the aerobic zone of MFBR to form a granular activated carbon biological reaction zone. The DO concentration in this reaction zone is significantly reduced and maintained at about 1 mg / L, ensuring the dissolved oxygen state required by the anoxic and anaerobic zones at the front end. The effluent results during normal operation are shown in Table 1 below. The effluent stably meets the Class A standard of the Pollutant Discharge Standard for Municipal Wastewater Treatment Plants (GB18918-2002) for CODcr, BOD5, SS, TN, TP and NH4+-N.

[0026] Table 1 Various indicators of inlet and outlet water quality

[0027]

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A sewage treatment device combining MFBR and granular activated carbon biological treatment, characterized by: It includes an anoxic zone, an anaerobic zone, an MFBR aerobic zone, a granular activated carbon biological reaction zone and a sedimentation zone which are connected in sequence according to the direction of water flow. The granular activated carbon biological reaction zone is connected to the anoxic zone through a nitrification liquid reflux device, and the sedimentation zone is connected to the sedimentation zone through a sludge reflux device.

2. The sewage treatment device combining MFBR and granular activated carbon biological treatment according to claim 1 is characterized in that: A paddle stirrer is provided in the granular activated carbon biological reaction zone, and an upper paddle blade and a lower paddle blade are installed on a stirring shaft of the paddle stirrer.

3. The sewage treatment device combining MFBR and granular activated carbon biological treatment according to claim 2 is characterized in that: The upper blades are turbine blades, and the lower blades are frame blades or anchor blades.

4. The sewage treatment device combining MFBR and granular activated carbon biological treatment according to claim 3 is characterized in that: A submersible mixer is provided in the anoxic zone.

5. The sewage treatment device combining MFBR and granular activated carbon biological treatment according to claim 4 is characterized in that: A submersible mixer is also provided in the anaerobic zone.

6. The sewage treatment device combining MFBR and granular activated carbon biological treatment according to claim 5, characterized in that: An aeration system is provided in the aerobic zone of the MFBR.

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