A magnetic fluidized bed biochemical degradation device of a recyclable biomass charcoal particle carrier

Abstract

The utility model relates to sewage treatment technical field, concretely relates to a kind of magnetic fluidized bed biochemical degradation device of recyclable biomass charcoal granule carrier. The magnetic fluidized bed biochemical degradation device includes biochemical degradation component, decanting component, electromagnetic component, aeration component and recovery component, and opening is equipped above biochemical degradation component, and biochemical degradation is carried out to sewage in biochemical degradation component, decanting component includes decanting pipe and self-priming pump, decanting pipe is arranged in the upper half space of biochemical degradation component, decanting pipe is connected with self-priming pump, and the water outlet of self-priming pump is arranged outside biochemical degradation component;Electromagnetic component is arranged in the bottom in biochemical degradation component, and electromagnetic component can adsorb magnetic biochar in energized state;Aeration component is arranged above electromagnetic component;Recovery component is connected with biochemical degradation component through sludge discharge pipeline.The utility model passes through magnetic fluidized bed biochemical degradation device, not only realizes magnetic carrier adsorption, recycling and reuse, but also improves sewage treatment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier. Background Technology

[0002] Urban sewage generally consists mainly of domestic wastewater, industrial wastewater, and wastewater from agricultural product processing. The quality and quantity of sewage discharged from different towns vary due to the influence of local residents' lifestyles, economic development levels, and the sophistication of infrastructure. Currently, urban domestic sewage treatment technologies are mainly divided into three categories: physical sewage treatment technologies, biological sewage treatment technologies, and integrated sewage treatment technologies. Integrated treatment technologies significantly improve treatment efficiency by combining physical, chemical, and biological methods. However, current integrated sewage treatment technologies rely heavily on biochar as a consumable material, requiring the consumption of large quantities of biochar during the sewage treatment process.

[0003] Therefore, developing a new wastewater treatment technology that can recycle biochar will enable the recycling of biochar and has significant application value. Summary of the Invention

[0004] This invention addresses the problem that biochar used as a carrier cannot be recycled, and improves existing integrated wastewater treatment technology.

[0005] The technical solution adopted by this utility model to solve the technical problem is:

[0006] A magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier includes:

[0007] A biochemical degradation component, wherein an opening is provided at the top of the biochemical degradation component, wastewater to be treated and magnetic biochar are added to the biochemical degradation component, and the wastewater is biochemically degraded in the biochemical degradation component, wherein the biochemical degradation component is a wastewater treatment fluidized bed;

[0008] A decanting assembly, comprising a decanting pipe and a self-priming pump, wherein the decanting pipe is disposed in the upper half of the biochemical degradation assembly, the decanting pipe is connected to the self-priming pump, and the outlet of the self-priming pump is disposed outside the biochemical degradation assembly;

[0009] An electromagnetic component is disposed at the bottom of the biochemical degradation component, and the electromagnetic component can adsorb the magnetic biochar when energized;

[0010] An aeration component is disposed within the biochemical degradation component and is positioned above the electromagnetic component;

[0011] A recycling component is connected to the biochemical degradation component via a sludge discharge pipe.

[0012] In the aforementioned magnetic fluidized bed biochemical degradation device, the magnetic biochar is biochar particles that have been magnetized, and the magnetic biochar serves as a carrier for microorganisms, which can form a microbial film on the magnetic biochar.

[0013] In the aforementioned magnetic fluidized bed biochemical degradation device, the decanting pipe includes a main pipe and a pair of horizontal holes and a pair of inclined holes disposed on the main pipe. The main pipe is a rigid pipe and is connected to the self-priming pump via a flexible hose. The inclined holes are downward-sloping holes.

[0014] In the aforementioned magnetic fluidized bed biochemical degradation device, the diameter of the main pipe is 1cm to 2cm, the material of the main pipe is UPVC, the length of the main pipe is 15 to 30cm, the diameter of the horizontal hole and the inclined hole is 0.4cm to 0.8cm, the distance between the two horizontal holes is 10cm, and the distance between the two inclined holes is 5cm.

[0015] In the aforementioned magnetic fluidized bed biochemical degradation device, the aeration assembly includes an aeration main pipe, aeration branch pipes, and aerators. The aerators are connected to the aeration main pipe via the aeration branch pipes. Multiple aeration branch pipes are connected to one aeration main pipe, and multiple aerators are connected to one aeration branch pipe.

[0016] In the aforementioned magnetic fluidized bed biochemical degradation device, the recovery component includes a recovery tank, the bottom surface of which is at the same level as the bottom surface of the biochemical degradation component, or the bottom surface of the recovery tank is slightly lower than the bottom surface of the biochemical degradation component.

[0017] In the aforementioned magnetic fluidized bed biochemical degradation device, a stirring fan is provided inside the recovery tank.

[0018] In the aforementioned magnetic fluidized bed biochemical degradation device, a strongly magnetic electromagnet is provided at the bottom of the recycling tank.

[0019] In the aforementioned magnetic fluidized bed biochemical degradation device, the interface between the sludge discharge pipe and the biochemical degradation component is more than 5 cm away from the bottom of the biochemical degradation component.

[0020] In the aforementioned magnetic fluidized bed biochemical degradation device, a ball valve is provided in the sludge discharge pipe.

[0021] In the aforementioned magnetic fluidized bed biochemical degradation device, aerobic microorganisms are added along with the wastewater to be treated and magnetic biochar, thereby enabling the biochemical degradation of the wastewater.

[0022] By employing the above technical solution, this utility model has at least the following advantages:

[0023] 1) This utility model adopts the principle of adsorbing organic matter in wastewater by biomass carbon magnetic carrier, and designs a three-phase fluidized bed treatment device that integrates magnetic carrier adsorption, recovery, utilization and biochemical treatment. By adopting a combination of physical, chemical and biological methods, the treatment efficiency is greatly improved, and it has the advantages of saving resources and reducing production costs.

[0024] 2) The present invention prepares a biochar carrier by magnetizing biochar, and uses a biochemical degradation component to suspend a large number of solid particles of biochar carrier in a flowing liquid, thereby giving the particles the appearance characteristics of fluid and exhibiting a solid-liquid contact state, thus achieving full fluidization of the biochar carrier material.

[0025] 3) The present invention uses the bubbles generated by the aeration component to ensure that the magnetic biochar carrier is fully agitated in the sewage and has sufficient dissolved oxygen, providing a suitable environment for the growth and film formation of microorganisms.

[0026] 4) This utility model adopts an integrated design, which allows the solid, liquid and gas phases inside the device to fully transfer mass while the adsorption carrier can use its surface free energy to adsorb organic matter in the sewage and use biological bacteria to carry out biochemical degradation, thus having the same effect as the activated sludge process, which can greatly improve the treatment efficiency.

[0027] 5) This utility model eliminates the need for secondary sedimentation, thereby reducing the time required for sewage treatment and increasing the daily wastewater treatment capacity.

[0028] 6) Compared with traditional adsorption carriers, the biochar carrier adsorbent used in this utility model has a large adsorption capacity, does not exhibit bubbling fluidization, and can be recycled after being processed by a recovery device, which can save wastewater treatment costs.

[0029] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a top view of the magnetic fluidized bed biochemical degradation device for recyclable biochar granular carrier of this utility model.

[0031] Figure 2 yes Figure 1 A cross-sectional view along the AA direction;

[0032] Figure 3 yes Figure 1 A cross-sectional view along the BB direction. Detailed Implementation

[0033] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended purpose of the invention, the following detailed description of the specific implementation methods, structures, features and effects of this utility model application is provided in conjunction with the accompanying drawings and preferred embodiments.

[0034] like Figures 1-3 As shown, this embodiment provides a magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier, including a biochemical degradation component 1, a decanting component 2, an electromagnetic component 3, an aeration component 4, and a recovery component 5. An opening is provided above the biochemical degradation component 1, through which wastewater to be treated and magnetic biochar are added. The decanting component 2 includes a decanting pipe 21 and a self-priming pump 23. The decanting pipe 21 is located in the upper half of the biochemical degradation component 1 and is connected to the self-priming pump 23. The outlet of the self-priming pump 23 is located outside the biochemical degradation component 1. The electromagnetic component 3 is located at the bottom of the biochemical degradation component 1 and can adsorb the magnetic biochar when energized. The aeration component 4 is located in the biochemical degradation component, specifically above the electromagnetic component 3. The recovery component 5 is connected to the biochemical degradation component 1 via a sludge discharge pipe 51.

[0035] The magnetic biochar is a biochar particle prepared by magnetizing biochar. The magnetic biochar serves as a carrier for microorganisms, which can form a microbial film on the magnetic biochar. The magnetic biochar can be adsorbed by the electromagnetic component 3.

[0036] The magnetic biochar carrier in the biochemical degradation component 1 is surrounded by an oxygen-rich environment with high dissolved oxygen content, resulting in rapid microbial growth. A microbial biofilm quickly forms on the carrier, continuously degrading surrounding organic pollutants. In this embodiment, the magnetic biochar carrier has a filling rate of 30%–60% and an actual specific surface area of ​​800–1200 m². 2 / m 3 This ensures a large contact area between the biofilm and domestic sewage, thereby improving the treatment efficiency of domestic sewage.

[0037] The wastewater to be treated contains microorganisms that can degrade organic matter, and additional microorganisms that degrade organic matter can be added to the biochemical degradation component 1. These microorganisms can form a microbial film on the biochar, and the microbial film adheres to the magnetic biochar to form a magnetic microbial film. Using magnetic biochar to form a magnetic microbial film helps to separate the treated water from the sludge and also facilitates the recovery of the magnetic biochar.

[0038] The working process of the magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier provided by this utility model is as follows: 1) Pour a quantitative amount of urban sewage sample into the biochemical degradation device, turn on the air pump, observe the flow meter, determine and stabilize a suitable air intake rate, and aerator 43 stably produces bubbles. 2) Add an appropriate amount of magnetic biochar carrier and suitable biological strains, so that the magnetic biochar carrier is fully stirred in the sewage and there is sufficient dissolved oxygen, providing a suitable environment for the growth and film formation of microorganisms. 3) After a suitable hydraulic retention time, stop aeration. 4) Turn on the electromagnet 53 at the bottom of the biochemical degradation device. After the magnetic biochar carrier settles and adsorbs at the bottom of the container and the upper water sample becomes clear, turn on the self-priming pump 23 and discharge the upper clarified water sample from the biochemical degradation device through the decanter. 5) After the water sample inside the device drops to a certain water level, turn off the electromagnet in the electromagnetic component, open the ball valve of the sludge discharge pipe 51, and let the remaining sludge and water in the biochemical degradation device enter the separation and recovery device. 6) Inside the separation and recovery device, turn on the agitator to allow the remaining mud and water to be fully agitated by the fan blades 54, separating the magnetic biochar carrier from the surface biofilm and attached residual organic matter. Then, energize the electromagnet 53 at the bottom of the separation and recovery device to magnetically attract the magnetic biochar carrier, thus achieving carrier recycling. In the recovery component 5, strong agitation by the fan blades 54 is required to separate the microbial film from the carrier material; the microbial structure will be mechanically damaged and lose its activity.

[0039] The biochemical degradation component 1 of this invention discharges a portion of sludge containing microorganisms through the outlet height of the sludge discharge pipe 51 into the recycling device 5. Then, through vigorous agitation, the microbial membrane is separated from the carrier material, the carrier material is recycled, and the sludge containing microorganisms is discharged. A portion of the microbial membrane remains in the biochemical degradation component 1 as a microbial inoculum for the next biochemical treatment process, where the microorganisms continue to multiply and degrade organic matter.

[0040] The carrier material is separated by two magnetic separation processes (magnetic separation in the recovery device 5 and separation by the biochemical degradation component 1). This two-stage separation process is more efficient. The biochemical degradation component 1 can retain the necessary microbial strains (the retained strains will not be destroyed by the magnetic separation and agitation in the recovery device 5, thus ensuring high activity).

[0041] Specifically, in order to ensure that the sludge can be divided into two parts, the sludge discharge pipe 51 is at a certain distance from the bottom of the biochemical degradation component (in this embodiment, the sludge discharge pipe 51 is 10cm from the bottom surface of the biochemical degradation component 1). In this way, when the sludge discharge pipe 51 discharges the sludge water into the recycling component 5, some of the active sludge containing microorganisms can remain in the biochemical degradation component 1. In this way, it is not necessary to add aerobic microorganisms (the microorganisms retained in the biochemical degradation component can continue to maintain their biological activity).

[0042] As a possible implementation, the distance between the center point of the sludge discharge pipe 51 and the bottom of the biochemical degradation component can be any value greater than 5 cm.

[0043] The magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier provided by this utility model is an intermittent batch wastewater treatment device. Specifically, after wastewater reaches treatment standards and is added to the biochemical degradation component 1, it is discharged using a decanter. Once the sludge is treated, a second batch of wastewater is added. The magnetic biochar added to the biochemical degradation component 1 can be recycled after magnetic separation. After the magnetic biochar reacts in the biochemical degradation component 1, a microbial film thickens, forming a magnetic biofilm carrier.

[0044] Through agitation and friction in the recycling component 5, the biofilm on the magnetic biochar detaches, and the magnetic biochar passes through the recycling component 5 and can be recycled back into the wastewater treatment fluidized bed. In this process, only the magnetic biochar is recycled, while most of the microorganisms and biofilm are discharged.

[0045] The magnetic fluidized bed biochemical degradation device with recyclable biochar particle carrier of this invention can reuse aerobic microorganisms in biochemical degradation component 1, and discharge excess microorganisms through recycling component 5.

[0046] The recycling component 5 can recover most of the magnetic biochar, thus enabling its reuse. In the recycling component 5, agitation separates the magnetic biochar carrier from the surface biofilm and attached residual organic matter in the remaining sludge. Then, electromagnetic adsorption is used again to separate the magnetic biochar carrier from the remaining sludge, resulting in the discharge of the sludge and completing the wastewater treatment process.

[0047] The electromagnetic component 3 of this invention exhibits strong magnetism when energized. After the biochemical reaction is completed, aeration is stopped. The magnetic attraction of the electromagnet to the magnetic biochar causes the magnetic biochar carrier to quickly settle to the bottom, accelerating the clarification of the upper layer of treated water. The treated upper clear liquid is then discharged through the decanting pipe 21. The decanting pipe 21 is a device for periodically removing clarified water. It can decan the clarified water from the still surface of the tank without disturbing the sediment, ensuring the quality of the effluent.

[0048] This invention also investigated the effects of five factors—hydraulic retention time, loading density, aeration intensity, influent concentration, and pollution load—on the wastewater treatment effect, and conducted data processing and analysis to determine the optimal conditions for this magnetic fluidized bed treatment device based on sludge biochar.

[0049] In this embodiment, the influent flow rate is 7.2 L / h, and the measurement range conditions for the above five factors are as follows:

[0050] (1) Influent concentration: The water temperature is controlled at 18-20℃. The effects of high and low concentrations of c-280 (COD 280mg / L) and c-400 (COD 400mg / L) on the treatment effect of the biochemical degradation device are investigated.

[0051] (2) Aeration intensity: 8.23m 3 / h, 8.94m 3 / h, 9.85m 3 Wastewater is aerated at an aeration rate of / h.

[0052] (3) Loading density: Wastewater was treated with magnetic biochar carriers with loading amounts of 30%, 45%, and 60%, respectively.

[0053] (4) Hydraulic residence time: The hydraulic residence times are 2h, 4h and 6h respectively.

[0054] (5) Pollution load: For biochemical degradation devices, an important indicator for determining their application is to determine the pollution load by changing the hydraulic residence time during the pollution load capacity test of the device, and to measure its treatment effect on COD, TN, and NH3-N.

[0055] The specific parameters of each component of the magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier provided by this utility model are as follows: the cylindrical cylinder of the biochemical degradation device has a diameter of 40cm, a height of 60cm, and a wall thickness of 1-2cm. An aeration system is installed inside the device, which consists of an aeration main pipe 41, aeration branch pipes 42, and aerators 43. The aerators 43 have a diameter of 3-5cm, the aeration branch pipes 42 have a diameter of 16mm, and the aeration main pipe 41 has a diameter of 25mm. Several aerators 43 are connected to the aeration main pipe 41 via the aeration branch pipes 42. By observing the flow meter on the air inlet pipe and adjusting the air pump intake rate, while ensuring that the magnetic biochar carrier can be agitated, the influence of aeration intensity on the biochemical degradation treatment effect is explored, thereby determining the optimal aeration intensity.

[0056] To improve the solid-liquid separation effect during the wastewater treatment process, this invention further relates to the decanting pipe 21. The decanting pipe 21 includes a main pipe and a pair of horizontal holes and a pair of inclined holes disposed on the main pipe. The main pipe is a rigid pipe and is connected to the self-priming pump 23 via a flexible hose 22. The inclined holes are downward-sloping holes, which prevent particulate matter from entering the decanter, thereby making the decanted water clearer.

[0057] Furthermore, the diameter of the main pipe is 1cm to 2cm, the material of the main pipe is UPVC, the length of the main pipe is 15 to 30cm, the diameter of the horizontal hole and the inclined hole is 0.4cm to 0.8cm, the distance between the two horizontal holes is 10cm, and the distance between the two inclined holes is 5cm.

[0058] Furthermore, to further achieve the goal of suspending the biochar carrier in flowing water and ensuring sufficient solid-liquid contact, thereby achieving full fluidization of the biochar carrier material, this invention further designs the aeration component 4. The aeration component 4 includes an aeration main pipe, aeration branch pipes, and aerators 43. Each aerator 43 is connected to the aeration main pipe via aeration branch pipe. Multiple aeration branch pipes are connected to one aeration main pipe, and multiple aerators 43 are connected to one aeration branch pipe.

[0059] To achieve the recycling of the magnetic biochar, this invention further designs the recycling component 5. The recycling component 5 includes a recycling bin 52, the bottom surface of which is at the same level as the bottom surface of the biochemical degradation component, or the bottom surface of the recycling bin 52 is slightly lower than the bottom surface of the biochemical degradation component.

[0060] This invention investigates and analyzes the results of different experimental factors on the degradation treatment of the biochemical device, thereby determining the optimal indicators of the experimental factors under various experimental variables. Under the adjustment of various factors, the treatment effects of COD, TN, and NH3-N, as well as the stable operation and high treatment efficiency of the biochemical treatment device through continuous adjustment and operation, with monitoring of effluent quality, are shown in Table 4-1. Furthermore, the effluent indicators such as COD, BOD, and NH3-N all meet the Class A discharge requirements of the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB 18918-2002). (V=0.075m) 3 Q = 172.8m 3 / d).

[0061] Specifically, this invention stops aeration after 2 to 6 hours of reaction.

[0062] Table 4-1 Optimal Effluent Parameters and Relevant Discharge Standards under Different Parameters

[0063]

[0064] To further improve the purity of the recovered magnetic biochar, a stirring blade 54 is provided in the recovery tank 52, so that the remaining mud and water are fully stirred by the blade 54, and the magnetic biochar carrier is separated from the surface biofilm and attached residual organic matter.

[0065] To further improve the efficiency of recycling the magnetic biochar, a strong magnetic electromagnet 53 is provided at the bottom of the recycling bin 52, so that the magnetic biochar separated from the organic matter can be adsorbed by magnetic force, thereby realizing the recycling of the biochar carrier.

[0066] Furthermore, the recycling bin 52 has a diameter of 20 cm and a wall thickness of 1-2 cm. An agitator and agitator blades 54 are installed inside the device. The lowest point of the blades 54 is 6-7 cm from the bottom of the container. The agitator is installed to separate the magnetic biochar carrier deposited after wastewater treatment from the biofilm attached to its surface and the residual organic matter after degradation. A strong electromagnet 53 is also installed at the bottom of the outer wall of the separation and recycling device. Mechanical agitation peels the attached biofilm and residual organic matter from the magnetic biochar carrier. Then, the electromagnet 53 is energized to adsorb the magnetic biochar carrier, thus achieving the purpose of recycling the magnetic biochar carrier.

[0067] Furthermore, a ball valve is provided in the sludge discharge pipe 51 to facilitate the control of the sludge and water deposited in the biochemical degradation device. The diameter of the sludge discharge pipe 51 is 16 mm. A ball valve with a diameter of 25 mm is installed in the middle section of the sludge discharge pipe 51 to facilitate the control of the sludge and water deposited in the biochemical degradation device.

[0068] Furthermore, both the biochemical degradation component 1 and the recycling component 5 are equipped with vent pipes with a diameter of 16 mm for periodically cleaning the inner walls of the device and inspecting the equipment.

[0069] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A magnetic fluidized bed biochemical degradation device with recyclable biochar granular carrier, characterized in that, include: A biochemical degradation component, wherein an opening is provided at the top of the biochemical degradation component, wastewater to be treated and magnetic biochar are added to the biochemical degradation component, and the wastewater is biochemically degraded in the biochemical degradation component; A decanting assembly, comprising a decanting pipe and a self-priming pump, wherein the decanting pipe is disposed in the upper half of the biochemical degradation assembly, the decanting pipe is connected to the self-priming pump, and the outlet of the self-priming pump is disposed outside the biochemical degradation assembly; An electromagnetic component is disposed at the bottom of the biochemical degradation component, and the electromagnetic component can adsorb the magnetic biochar when energized; An aeration component is disposed within the biochemical degradation component and is positioned above the electromagnetic component; A recycling component is connected to the biochemical degradation component via a sludge discharge pipe.

2. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, The magnetic biochar is biochar particles that have been magnetized. The magnetic biochar serves as a carrier for microorganisms, which can form a microbial film on the magnetic biochar.

3. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, The decanting pipe includes a main pipe and a pair of horizontal holes and a pair of inclined holes provided on the main pipe. The main pipe is a rigid pipe and is connected to the self-priming pump via a flexible hose. The inclined holes are downward-sloping holes.

4. The magnetic fluidized bed biochemical degradation device according to claim 3, characterized in that, The main pipe has a diameter of 1cm to 2cm and a length of 15cm to 30cm. The horizontal holes and the inclined holes have a diameter of 0.4cm to 0.8cm. The distance between two horizontal holes is 10cm and the distance between two inclined holes is 5cm.

5. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, The aeration assembly includes an aeration main pipe, aeration branch pipes, and aerators. The aerators are connected to the aeration main pipe via the aeration branch pipes. Multiple aeration branch pipes are connected to one aeration main pipe, and multiple aerators are connected to one aeration branch pipe.

6. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, The recycling component includes a recycling bin, the bottom surface of which is at the same level as the bottom surface of the biochemical degradation component, or the bottom surface of the recycling bin is slightly lower than the bottom surface of the biochemical degradation component.

7. The magnetic fluidized bed biochemical degradation device according to claim 6, characterized in that, The recycling bin is equipped with stirring blades; A strong magnetic electromagnet is installed at the bottom of the recycling bin.

8. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, The interface between the sludge discharge pipe and the biochemical degradation component is more than 5 cm away from the bottom of the biochemical degradation component.

9. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, A ball valve is installed in the sludge discharge pipe.

10. The magnetic fluidized bed biochemical degradation device according to claim 1, characterized in that, Aerobic microorganisms are added along with the wastewater to be treated and magnetic biochar.

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