Anaerobic fermentation sludge reflux device

Abstract

The utility model discloses an anaerobic fermentation sludge reflux device which comprises a two-phase centrifugal machine, and a feed port of the two-phase centrifugal machine is connected with an overflow port of an anaerobic digestion tank; a feed port of the sludge conditioning tank is connected with a sludge discharge port of the two-phase centrifugal machine, and a stirrer is arranged in the sludge conditioning tank; the water supply mechanism is externally connected with tap water and is connected to the sludge conditioning tank; the acidification tank is connected with the sludge conditioning tank and is used for conveying acidified slurry to the sludge conditioning tank; and the anaerobic feed pump is connected with the discharge hole of the sludge conditioning tank and is used for conveying the sludge to the anaerobic digestion tank. According to the anaerobic fermentation sludge reflux device, the two-phase centrifugal machine is used for separating a liquid phase from a solid phase of a mixture overflowing from the anaerobic digestion tank, in order to recover active anaerobic bacteria in solid-phase sludge, the sludge is conveyed to the sludge conditioning tank, and after tap water and acidified slurry are added, the active anaerobic bacteria obtain higher activity; and the activated anaerobic strains are conveyed back to the anaerobic digestion tank through the anaerobic feeding pump, so that the recovery of the activated anaerobic strains is completed.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen waste treatment, and in particular to an anaerobic fermentation sludge reflow device. Background Art

[0002] At present, in the anaerobic digestion tank for sludge treatment, anaerobic fermentation of sludge is generally completed by adding anaerobic bacteria. In order to make the anaerobic bacteria fully contact with the sludge, a stirring mechanism is set in the anaerobic digestion tank. Stirring helps to promote the rapid separation of biogas and digestate produced by material digestion. At the same time, stirring also helps to prevent the scum crusting on the surface of the upper biogas, so that the sludge in the entire anaerobic digestion tank is in an up and down rolling and digestion active state.

[0003] The anaerobic bacteria in the tank are evenly mixed with the agitator to the height of each section of the anaerobic tank. The sludge bacteria in the middle and upper layers of the tank are more active, and the sludge at the bottom of the tank is generally sand accumulated in the material or dead bacteria. At present, the anaerobic digestion tank is generally equipped with an overflow port at the top to allow sewage to overflow. The active anaerobic sludge bacteria in the middle and upper layers of the anaerobic digestion tank will inevitably overflow into the biogas pool through the overflow port with the biogas, causing the loss of anaerobic sludge bacteria. When the sludge content in the anaerobic tank is reduced to a certain level, it is easy to cause a decrease in digestion capacity, low biogas production, and insufficient utilization of organic matter, thereby affecting the safe operation of the entire anaerobic digestion system.

[0004] Therefore, how to reduce the loss of active anaerobic bacteria in anaerobic digesters is an urgent problem to be solved in the field of food waste treatment. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an anaerobic fermentation sludge reflow device, which can recover the lost active anaerobic bacteria, thereby maintaining the content of active anaerobic bacteria in the anaerobic digestion tank, so that it has a relatively stable digestion capacity.

[0006] The anaerobic fermentation sludge reflow device according to the first embodiment of the present invention comprises:

[0007] A two-phase centrifuge, wherein the feed inlet of the two-phase centrifuge is connected to the overflow port of the anaerobic digestion tank;

[0008] A sludge conditioning tank, wherein the feed inlet of the sludge conditioning tank is connected to the sludge discharge port of the two-phase centrifuge, and an agitator is arranged in the sludge conditioning tank;

[0009] A water supply mechanism, the water supply mechanism is connected to tap water externally and to the sludge conditioning tank, and is used to transport tap water into the sludge conditioning tank;

[0010] an acidification tank, the acidification tank being connected to the sludge conditioning tank and being used for conveying acidified slurry to the sludge conditioning tank;

[0011] An anaerobic feed pump, which is connected to the discharge port of the sludge conditioning tank and is used to transport the conditioned sludge to the anaerobic digestion tank.

[0012] The anaerobic fermentation sludge reflux device according to the embodiment of the present invention has at least the following beneficial effects: using a two-phase centrifuge to separate the liquid phase and the solid phase of the mixture overflowing from the anaerobic digestion tank. In order to recover the active anaerobic bacteria in the solid-phase sludge, the sludge is transported to the sludge conditioning tank, and after adding tap water and acidified slurry, the active anaerobic bacteria can obtain stronger activity, and then it is re-transported back to the anaerobic digestion tank through the anaerobic feed pump to complete the recovery of the active anaerobic bacteria.

[0013] According to some embodiments of the present invention, the anaerobic fermentation sludge reflux device further includes a sludge storage tank, which is arranged between the two-phase centrifuge and the sludge conditioning tank and is used to temporarily store the sludge discharged by the two-phase centrifuge.

[0014] According to some embodiments of the present invention, the anaerobic fermentation sludge reflux device further includes a sludge transfer pump, which is connected to the sludge storage tank and is used to transport the sludge in the sludge storage tank to the sludge conditioning tank.

[0015] According to some embodiments of the present invention, the water supply mechanism is provided with a branch pipe connected to the sludge transfer pump, and the branch pipe is used to transport tap water to the sludge transfer pump to clean the sludge transfer pump.

[0016] According to some embodiments of the present invention, the anaerobic fermentation sludge reflux device further includes a slurry pump, which is connected to the acidification tank and transports the acidified slurry in the acidification tank to the sludge conditioning tank.

[0017] According to some embodiments of the present invention, the acidification tank is provided with another discharge port connected to the anaerobic feed pump, which is used to output acidified slurry to the anaerobic feed pump to directly enter the anaerobic digestion tank.

[0018] According to some embodiments of the present invention, a first valve is arranged between the sludge conditioning tank and the anaerobic feed pump, and a second valve is arranged between the acidification tank and the anaerobic feed pump; when the first valve is opened and the second valve is closed, the sludge conditioning tank transports the conditioned sludge to the anaerobic digestion tank; when the second valve is opened and the first valve is closed, the acidification tank transports the acidified slurry to the anaerobic digestion tank.

[0019] According to some embodiments of the present invention, the number of anaerobic digestion tanks is two or more, and each anaerobic digestion tank is connected to the anaerobic feed pump through a pipeline.

[0020] According to some embodiments of the present invention, a valve is provided between each of the anaerobic digestion tanks and the anaerobic feed pump, and whether the corresponding anaerobic digestion tank and the anaerobic feed pump are connected is controlled by the valve.

[0021] According to some embodiments of the present invention, the sludge conditioning tank is provided with an observation window for an operator to observe the situation inside the tank.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0023] The present invention will be further described below in conjunction with the drawings and embodiments, where:

[0024] Figure 1 It is a connection schematic diagram of the anaerobic fermentation sludge reflux device according to an embodiment of the present invention.

[0025] Reference numerals: 100 - two-phase centrifuge, 200 - sludge conditioning tank, 210 - agitator, 220 - first valve, 300 - water supply mechanism, 400 - acidification tank, 410 - second valve, 500 - anaerobic feed pump, 600 - sludge storage tank, 700 - sludge transfer pump, 800 - slurry pump, 900 - anaerobic digestion tank. Detailed Embodiments

[0026] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that with respect to the orientation description, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0028] In the description of the present invention, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood not to include the present number, and above, below, within, etc. are understood to include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0030] In the description of the present invention, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0031] In the current anaerobic digestion tank for sludge treatment, anaerobic fermentation of sludge is generally completed by adding anaerobic bacteria. In order to enable the anaerobic bacteria to fully contact the sludge, a stirring mechanism is provided in the anaerobic digestion tank. Stirring helps to promote the rapid separation of biogas generated by material digestion and the digestate, and at the same time, stirring also helps to prevent the scum on the surface of the upper-layer biogas liquid from forming a crust, making the sludge in the entire anaerobic digestion tank tumble up and down and be in an active digestion state.

[0032] The anaerobic bacteria in the tank are evenly mixed to each height section of the anaerobic tank along with the stirring of the stirrer. The sludge bacteria in the middle and upper layers of the tank are relatively active bacteria, and the sludge at the bottom of the tank is generally accumulated sand in the material or dead bacteria. Currently, the anaerobic digestion tank generally has an overflow port at the top to allow sewage to overflow. The active anaerobic sludge bacteria in the middle and upper layers of the anaerobic digestion tank will inevitably overflow to the biogas liquid tank along with the biogas liquid through the overflow port, resulting in the loss of anaerobic sludge bacteria. When the sludge content in the anaerobic tank drops to a certain level, it is likely to cause a decline in digestion capacity, a low biogas production, and insufficient utilization of organic matter, thus affecting the safe operation of the entire anaerobic digestion system.

[0033] Therefore, how to reduce the loss of active anaerobic bacteria in the anaerobic digestion tank is an urgent problem to be solved in the current field of food waste treatment.

[0034] In response to this, the present application proposes an anaerobic fermentation sludge reflux device, which uses a two-phase centrifuge 100 to separate the liquid phase and the solid phase of the mixture overflowing from the anaerobic digestion tank 900. In order to recover the active anaerobic bacteria in the solid-phase sludge, the sludge is transported to the sludge conditioning tank 200, and after adding tap water and acidified slurry, the active anaerobic bacteria obtain stronger activity and are re-transported back to the anaerobic digestion tank 900 through the anaerobic feed pump 500 to complete the recovery of the active anaerobic bacteria.

[0035] Refer to Figure 1, in the anaerobic fermentation sludge reflux device of the embodiments of the present application, it includes a two-phase centrifuge 100, a sludge conditioning tank 200, a water supply mechanism 300, an acidification tank 400 and an anaerobic feed pump 500. Among them, the two-phase centrifuge 100 uses the centrifugal force generated during high-speed rotation to separate sewage and sludge with different weights. The sewage with active anaerobic bacteria can be directly recycled to the anaerobic digestion tank 900, while the sludge with active anaerobic bacteria needs to enter the sludge conditioning tank 200 for subsequent conditioning. Both the water supply mechanism 300 and the acidification tank 400 are connected to the sludge conditioning tank 200 through pipelines. The water supply mechanism 300 can supply tap water to the sludge conditioning tank 200, and the acidification tank 400 can supply acidified slurry to the sludge conditioning tank 200. By adjusting the proportion of tap water and acidified slurry output to the sludge conditioning tank 200, the concentration of the acidified slurry can be changed. The anaerobic feed pump 500 is used to re-output the conditioned sludge in the sludge conditioning tank 200 to the anaerobic digestion tank 900 to complete the recovery of active anaerobic bacteria in the sludge.

[0036] Specifically, the feed inlet of the two-phase centrifuge 100 is connected to the overflow port of the anaerobic digestion tank 900, so that the sewage sludge mixture flowing out from the overflow port of the anaerobic digestion tank 900 can directly enter the two-phase centrifuge 100 to complete the separation of the liquid phase and the solid phase.

[0037] The feed inlet of the sludge conditioning tank 200 is connected to the sludge discharge port of the two-phase centrifuge 100 to receive the sludge discharged by the two-phase centrifuge 100. A stirrer 210 is arranged in the sludge conditioning tank 200, which is used to stir the sludge to make it fully mixed with the acidified slurry. The sludge conditioning tank 200 is also provided with an observation window, which is transparent for the operator to observe the situation inside the tank, judge whether the liquid level is too high or too low, and observe whether the internal sludge is stirred evenly.

[0038] The water supply mechanism 300 is externally connected to tap water and connected to the sludge conditioning tank 200, which is used to transport tap water to the sludge conditioning tank 200. The acidification tank 400 is connected to the sludge conditioning tank 200, which is used to transport acidified slurry to the sludge conditioning tank 200. Thus, the sludge conditioning tank 200 can supplement water and acidified slurry with nutrients to the sludge, extend the lifespan of anaerobic bacteria in the sludge and maintain their activity, and prepare for subsequent transportation back to the anaerobic digestion tank 900.

[0039] The anaerobic feed pump 500 is connected to the discharge port of the sludge conditioning tank 200, which is used to transport the conditioned sludge to the anaerobic digestion tank 900 to complete the recovery of active anaerobic bacteria in the sludge.

[0040] Furthermore, the anaerobic fermentation sludge reflux device of the present application further includes a sludge storage tank 600. The sludge storage tank 600 is arranged between the two-phase centrifuge 100 and the sludge conditioning tank 200, and it is used to temporarily store the sludge discharged by the two-phase centrifuge 100.

[0041] Further, the anaerobic fermentation sludge reflux device further includes a sludge delivery pump 700, which is specifically a screw pump. The sludge delivery pump 700 is connected to the sludge storage tank 600 and is used to deliver the sludge in the sludge storage tank 600 to the sludge conditioning tank 200.

[0042] Further, the water supply mechanism 300 is provided with a branch pipe connected to the sludge delivery pump 700. This branch pipe is used to deliver tap water to the sludge delivery pump 700. When it is necessary to clean the sludge delivery pump 700 and its connected pipelines, the branch pipe is opened, and tap water enters the sludge delivery pump 700 to clean the sludge delivery pump 700.

[0043] Further, the anaerobic fermentation sludge reflux device further includes a slurry pump 800. The slurry pump 800 is connected to the acidification tank 400 and delivers the acidified slurry in the acidification tank 400 to the sludge conditioning tank 200. The function of the slurry pump 800 is to increase the flow rate of the acidified slurry flowing to the sludge conditioning tank 200.

[0044] Further, the acidification tank 400 is provided with another discharge port connected to the anaerobic feed pump 500, which is used to output the acidified slurry to the anaerobic feed pump 500. Thus, the acidification tank 400 can directly deliver the acidified slurry to the anaerobic digestion tank 900, playing a role in supplementing nutrients to the anaerobic digestion tank 900.

[0045] Further, a first valve 220 is provided between the sludge conditioning tank 200 and the anaerobic feed pump 500, and a second valve 410 is provided between the acidification tank 400 and the anaerobic feed pump 500. When the first valve 220 is opened and the second valve 410 is closed, the pipeline between the sludge conditioning tank 200 and the anaerobic feed pump 500 is connected, and the anaerobic feed pump 500 delivers the conditioned sludge to the anaerobic digestion tank 900. At this time, the sludge with active anaerobic bacteria is delivered to the anaerobic digestion tank 900 to complete the recovery. When the second valve 410 is opened and the first valve 220 is closed, the pipeline between the acidification tank 400 and the anaerobic feed pump 500 is connected, and the anaerobic feed pump 500 delivers the acidified slurry to the anaerobic digestion tank 900. At this time, the acidified slurry with nutrients is delivered to the anaerobic digestion tank 900 to supplement nutrients.

[0046] By switching the opening and closing of the first valve 220 and the second valve 410, the material delivered by the anaerobic feed pump 500 can be changed. The first valve 220 and the second valve 410 can be manually opened valves or electric valves powered by other power sources, which will not be elaborated here.

[0047] Furthermore, the number of anaerobic digestion tanks 900 is two or more, and each anaerobic digestion tank 900 is connected to the anaerobic feed pump 500 through a pipeline. Moreover, a valve is provided between each anaerobic digestion tank 900 and the anaerobic feed pump 500 to control whether the corresponding anaerobic digestion tank 900 is connected to the anaerobic feed pump 500. Thus, the anaerobic feed pump 500 can transport the conditioned sludge to two or more anaerobic digestion tanks 900, and based on the anaerobic bacteria situation in each anaerobic digestion tank 900, adjust the sludge transport volume transported to the corresponding anaerobic digestion tank 900 through the valve.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. An anaerobic fermentation sludge reflux device, characterized in that, Comprising: A two-phase centrifuge, the feed inlet of the two-phase centrifuge being connected to the overflow outlet of the anaerobic digestion tank; A sludge conditioning tank, the feed inlet of the sludge conditioning tank being connected to the sludge discharge outlet of the two-phase centrifuge, and a stirrer being provided inside the sludge conditioning tank; A water supply mechanism, the water supply mechanism being externally connected to tap water and connected to the sludge conditioning tank for conveying tap water into the sludge conditioning tank; An acidification tank, the acidification tank being connected to the sludge conditioning tank for conveying acidified slurry into the sludge conditioning tank; An anaerobic feed pump, the anaerobic feed pump being connected to the discharge outlet of the sludge conditioning tank for conveying the conditioned sludge to the anaerobic digestion tank.

2. The anaerobic fermentation sludge reflux device according to claim 1, characterized in that: The anaerobic fermentation sludge reflux device further includes a sludge storage tank, the sludge storage tank being arranged between the two-phase centrifuge and the sludge conditioning tank for temporarily storing the sludge discharged by the two-phase centrifuge.

3. The anaerobic fermentation sludge reflux device according to claim 2, characterized in that: The anaerobic fermentation sludge reflux device further includes a sludge transfer pump, the sludge transfer pump being connected to the sludge storage tank and used for conveying the sludge in the sludge storage tank to the sludge conditioning tank.

4. The anaerobic fermentation sludge reflux device according to claim 3, wherein: The water supply mechanism is provided with a branch pipe communicating with the sludge transfer pump, and the branch pipe is used for conveying tap water to the sludge transfer pump to clean the sludge transfer pump.

5. The anaerobic fermentation sludge reflux device according to claim 1, wherein: The anaerobic fermentation sludge reflux device further includes a slurry pump, the slurry pump being connected to the acidification tank and conveying the acidified slurry in the acidification tank to the sludge conditioning tank.

6. The anaerobic fermentation sludge reflux device according to claim 1, characterized in that: The acidification tank is provided with another discharge outlet connected to the anaerobic feed pump for outputting acidified slurry to the anaerobic feed pump to directly enter the anaerobic digestion tank.

7. The anaerobic fermentation sludge reflux device according to claim 6, characterized in that: A first valve is arranged between the sludge conditioning tank and the anaerobic feed pump, and a second valve is arranged between the acidification tank and the anaerobic feed pump; when the first valve is opened and the second valve is closed, the sludge conditioning tank conveys the conditioned sludge to the anaerobic digestion tank; when the second valve is opened and the first valve is closed, the acidification tank conveys acidified slurry to the anaerobic digestion tank.

8. The anaerobic fermentation sludge reflux device according to claim 1, characterized in that: The number of the anaerobic digestion tanks is two or more, and each of the anaerobic digestion tanks is connected to the anaerobic feed pump through a pipeline.

9. The anaerobic fermentation sludge reflux device according to claim 8, characterized in that: A valve is arranged between each of the anaerobic digestion tanks and the anaerobic feed pump, and whether the corresponding anaerobic digestion tank and the anaerobic feed pump are communicated is controlled through the valve.

10. The anaerobic fermentation sludge reflux device according to claim 1, characterized in that: The sludge conditioning tank is provided with an observation window for an operator to observe the situation inside the tank.

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