Device and method for preparing carbon source from kitchen organic waste liquid

Abstract

The invention provides a device and method for preparing a carbon source from kitchen organic waste liquid, and belongs to the technical field of kitchen organic waste liquid treatment.The circulation state of liquid in all cabins can be controlled through the structural design of partition plates and adjustment of opening and closing of movable partition plates at baffling openings, and when the movable partition plates are closed, the waste liquid in all the cabins is fully mixed; the hydrolytic acidification efficiency is improved, and the problem of instability of a carbon source caused by non-uniform mixing is reduced. When the movable partition plate is opened, liquid between different cabins flows in a baffling mode, the water flow speed at the baffling opening is increased, and when the liquid passes through the baffling opening, solid matter deposition is avoided, the size of the device is reduced, and cost is reduced. Through the structural design of the filtering reflux system, part of organic nitrogen and ammonia nitrogen in liquid can be intercepted, the total nitrogen of a carbon source can be reduced, the carbon source can be clearer, no solid impurities exist, concentrated liquid generated by filtering flows back, and the addition amount of alkali is reduced; and through the structural design that the box body and the box cover are buckled, maintenance of the interior of the box body is facilitated.

Description

Technical Field

[0001] This invention relates to the field of kitchen waste treatment technology, and more specifically, to an apparatus and method for preparing a carbon source from kitchen waste. Background Technology

[0002] Food waste is a common household waste, including leftover food, animal bones and offal, vegetable scraps, and waste oil. The waste liquid produced after the fermentation of food waste contains a large amount of organic matter and is classified as organic waste liquid.

[0003] Currently, the main method for treating organic waste liquid from kitchen waste is to produce biogas through anaerobic digestion, and then the remaining biogas slurry is sent to the sewage treatment system. This method cannot fully utilize the organic carbon source in the organic waste liquid and will increase the pressure on sewage treatment. Summary of the Invention

[0004] In view of the above problems, the purpose of this invention is to provide an apparatus and method for preparing carbon sources from kitchen waste liquid, so as to solve the problems in the existing kitchen waste liquid treatment methods that anaerobically produce biogas from organic waste liquid and then send the remaining biogas liquid into the sewage treatment system, which have the problems of not fully utilizing the organic carbon source and increasing the pressure on sewage treatment.

[0005] The apparatus for preparing a carbon source from kitchen organic waste liquid provided by the present invention includes a box body, a box cover, and a filtration and reflux system; wherein,

[0006] The top of the box is provided with an opening; an inlet pipe and an outlet pipe are respectively provided at the head and tail ends of the box; the inlet end of the inlet pipe is connected to the kitchen waste liquid generating device; along the length of the box, at least two partitions are provided inside the box to divide the box into at least three compartments.

[0007] The partition includes fixed partitions alternately arranged on two opposite inner sidewalls of the box body; the bottom end and one side end of the fixed partition are respectively fixed to the inner bottom end of the box body and the inner sidewall of the box body, and the other side end forms a flow deflection port with the other inner sidewall of the box body; a movable partition is slidably arranged on the side of the fixed partition near the flow deflection port;

[0008] The lid is fastened to the opening of the container body, and a stirring device is provided at the lower end of the lid for each compartment; the stirring device is located inside the compartment.

[0009] The filtration reflux system includes a filter connected to the outlet pipe and a concentrate reflux pipe connected to the concentrate outlet of the filter; the concentrate outlet of the concentrate reflux pipe is connected to the inlet pipe.

[0010] In addition, a preferred embodiment is to install an industrial alkali addition device on the side wall of the compartment near the head end of the container.

[0011] In addition, a preferred option is to install steam heating pipes at the bottom of each compartment.

[0012] In addition, a preferred embodiment is to provide an insulation layer on the outer wall of the enclosure.

[0013] In addition, a preferred option is to install temperature monitoring devices and pH detection devices in each of the cabins.

[0014] Furthermore, a preferred embodiment is that an electrically controlled gear is provided on one side of the fixed partition, the electrically controlled gear is connected to a motor, and the motor is located outside the housing; a rack matching the electrically controlled gear is provided on the movable partition; the rack is arranged along the direction of movement of the movable partition relative to the fixed partition.

[0015] In addition, a preferred embodiment is to provide a first valve at the inlet end of the inlet pipe; a second valve and a first check valve on the outlet pipe; and a second check valve, a third valve, and a fourth valve respectively located on both sides of the second check valve on the concentrate return pipe.

[0016] Furthermore, a preferred embodiment is that the filter is an ultrafiltration membrane filter.

[0017] The present invention provides a method for preparing a carbon source from kitchen waste liquid, which uses the apparatus described above to prepare a carbon source from kitchen waste liquid; the method includes the following steps:

[0018] The compartment near the front end of the container is designated as the head compartment, the compartment near the rear end of the container is designated as the rear compartment, the compartment between the head compartment and the rear compartment is designated as the middle compartment, the movable partition between the head compartment and the middle compartment is designated as the first movable partition, and the movable partition between the middle compartment and the rear compartment is designated as the second movable partition.

[0019] The first movable partition and the second movable partition are both closed, so that the head compartment and the middle compartment are both sealed; and the carbon source prepared in the tail compartment is sent into the filter through the liquid outlet pipe;

[0020] The clear liquid produced by the filter is used as a carbon source product, and the concentrated liquid produced by the filter is sent into the head chamber together with the waste liquid entering through the concentrated liquid return pipe and the inlet pipe.

[0021] Industrial alkali is added to the head chamber, and the stirring device in the head chamber is turned on to stir the liquid in the head chamber evenly. After the pH value is adjusted to 6-6.5, the first movable partition is opened to allow the liquid in the head chamber to flow into the middle chamber.

[0022] After the liquid in the middle compartment is stirred evenly by activating the stirring device in the middle compartment, the second movable partition is opened to allow the liquid in the middle compartment to enter the tail compartment. The stirring device in the tail compartment is then activated to ensure that the liquid in the tail compartment is mixed evenly, thereby preparing a carbon source.

[0023] Furthermore, a preferred embodiment is that the amount of liquid entering the head chamber is equal to the amount of prepared carbon source delivered from the tail chamber.

[0024] As can be seen from the above technical solution, the apparatus and method for preparing carbon sources from kitchen organic waste liquid provided by the present invention, through the structural design of the internal partition of the tank, can control the flow state of the liquid in each compartment by adjusting the opening and closing of the movable partition at the baffle. When the movable partition is closed, the waste liquid in each compartment can be fully mixed, improving the efficiency of hydrolysis and acidification, and reducing the problem of carbon source instability caused by uneven mixing. When the movable partition is open, the flow of liquid between different compartments is baffled, increasing the water flow velocity at the narrow baffle. When the liquid passes through the narrow baffle, solid matter deposition is avoided, reducing the size of the device and lowering the cost. Compared with the fully mixed design, it can better control the quality of the carbon source. Through the structural design of the filtration and reflux system, some organic nitrogen and ammonia nitrogen in the liquid can be intercepted, reducing the total nitrogen of the carbon source, and making the carbon source clearer without solid impurities, further improving the quality of the carbon source. Moreover, the reflux of the concentrated liquid produced by filtration increases the carbon source preparation volume and reduces the amount of alkali added. The structural design of the tank and the tank cover fastening facilitates the maintenance of the inside of the tank.

[0025] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description

[0026] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings, and with a more complete understanding of the invention.

[0027] Figure 1 This is a top view of the housing according to an embodiment of the present invention;

[0028] Figure 2 This is a top view of the box lid according to an embodiment of the present invention;

[0029] Figure 3 A side view of an apparatus for preparing a carbon source from kitchen waste liquid according to an embodiment of the present invention;

[0030] Figure 4 This is a connection diagram between the movable partition and the fixed partition according to an embodiment of the present invention;

[0031] Figure 5 This is a flowchart of a method for preparing a carbon source from kitchen waste liquid according to an embodiment of the present invention.

[0032] In the attached drawings, 1-box body, 11-inlet pipe, 12-outlet pipe, 13-chamber, 14-fixed partition, 15-baffle, 16-moving partition, 17-industrial alkali addition device, 2-box cover, 21-stirring device, 22-inspection port; 31-filter, 32-concentrate return pipe, 4-steam heating pipe, 5-insulation layer, 6-temperature monitoring device, 7-pH detection device, 81-electric control gear, 82-rack, 91-first valve, 92-second valve, 93-first check valve, 94-second check valve, 95-third valve, 96-fourth valve.

[0033] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0034] In response to the aforementioned problem that the existing method for treating kitchen waste liquid by anaerobic digestion to produce biogas and then allowing the remaining biogas slurry to enter the sewage treatment system has the drawbacks of underutilization of organic carbon sources and increased sewage treatment pressure, a device and method for preparing carbon sources from kitchen waste liquid are proposed.

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

[0036] To illustrate the apparatus and method for preparing carbon sources from kitchen waste liquid provided by the present invention, Figure 1 A top view of the housing according to an embodiment of the present invention is shown; Figure 2 A top view of the box lid according to an embodiment of the present invention is shown; Figure 3 A side view of an apparatus for preparing a carbon source from kitchen waste liquid according to an embodiment of the present invention is shown; Figure 4 The connection structure between the movable partition and the fixed partition according to an embodiment of the present invention is shown; Figure 5 A process for preparing a carbon source from kitchen waste liquid according to an embodiment of the present invention is shown.

[0037] like Figures 1 to 4As shown in the diagram, the apparatus for preparing a carbon source from kitchen waste liquid provided by the present invention includes a housing 1, a housing cover 2, and a filtration and reflux system; wherein,

[0038] The top of the container 1 is provided with an opening; an inlet pipe 11 and an outlet pipe 12 are respectively provided at the head and tail ends of the container 1; the inlet end of the inlet pipe 11 is connected to the kitchen waste liquid generating device; along the length of the container 1, at least two partitions are provided inside the container 1 to divide the container into at least three compartments 13.

[0039] The partition includes fixed partitions 14 that are alternately arranged on two opposite inner side walls of the housing 1; the bottom end and one side end of the fixed partition 14 are respectively fixed to the bottom end of the housing 1 and the inner side wall of the housing 1, and the other side end forms a baffle 15 with the other inner side wall of the housing 1; a movable partition 16 is slidably arranged on the side of the fixed partition 14 near the baffle 15.

[0040] The lid 2 is fastened to the opening of the container body 1, and a stirring device 21 is provided at the lower end of the lid 2 corresponding to each compartment 13; the stirring device 21 is located inside the compartment 13.

[0041] The filtration reflux system includes a filter 31 connected to the outlet pipe 12 and a concentrate reflux pipe 32 connected to the concentrate outlet of the filter 31; the concentrate outlet of the concentrate reflux pipe 32 is connected to the inlet pipe 11.

[0042] Specifically, the housing 1 is preferably made of welded steel plates, and the number of partitions is at least two, preferably two, such as... Figure 1-3 As shown, the interior of the box 1 is divided into three compartments by partitions. Of course, the number of partitions can also be three, four, five, etc., thereby dividing the interior of the box 1 into four, five, or six compartments. This invention does not make any particular limitation on this.

[0043] The preferred dimensions of the box body 1 are 7m long, 2m wide, and 3m high. However, the present invention does not impose any particular limitation on the dimensions of the box body 1, and it can be selected according to actual needs.

[0044] The end of the tank 1 that enters the waste liquid is the head end, and the end that discharges the carbon source is the tail end. The distance between the baffle near the head end of the tank 1 and its head end is preferably, but not limited to, 2m, and the distance between the baffle near the tail end of the tank 1 and its tail end is preferably, but not limited to, 2m.

[0045] The fixed partition 14 is preferably, but not limited to, a steel plate, with its bottom end and one side end welded to the inner bottom end of the box body 1 and the inner side wall of the box body 1, respectively.

[0046] An inspection port 22 is provided on the cover 2 to facilitate internal maintenance of the box 1.

[0047] The operating end of the stirring device is located on the top outside of the cover 2. Each compartment 13 preferably has two symmetrical stirring devices in the width direction of the body 1. The stirring device is preferably a stirrer with upper and lower rotating blades, and the rotation speed of the stirrer is controlled at 60 r / min.

[0048] By adjusting the opening and closing of the movable baffle 16 at the baffle 15 through the structural design of the internal partition of the housing 1, the flow state of the liquid in each compartment 13 can be controlled. When the movable baffle 16 is closed, the waste liquid in each compartment 13 can be fully mixed, improving the efficiency of hydrolysis and acidification and reducing the problem of carbon source instability caused by uneven mixing. When the movable baffle 16 is open, the flow of liquid between different compartments 13 is baffled, increasing the water flow velocity at the narrow baffle 15. When the liquid passes through the narrow baffle 15, solids are avoided from depositing, reducing the size of the device and lowering costs. Compared with the fully mixed design, it can better control the quality of the carbon source. Through the structural design of the filtration and reflux system, some organic nitrogen and ammonia nitrogen in the liquid can be intercepted, reducing the total nitrogen of the carbon source and making the carbon source clearer without solid impurities, further improving the quality of the carbon source. The reflux of the concentrated liquid produced by filtration increases the carbon source production and reduces the amount of alkali added. The structural design of the housing and the cover fastening facilitates the maintenance of the inside of the housing.

[0049] As a preferred embodiment of the present invention, an industrial alkali addition device 17 is provided on the side wall of the compartment 13 near the head end of the box body 1.

[0050] Specifically, the industrial alkali addition device 17 is preferably a dosing tank, which is connected to the side wall of the housing 1 via a pipe.

[0051] As a preferred embodiment of the present invention, a steam heating pipe 4 is provided at the bottom of each compartment 13.

[0052] Specifically, a steam heating pipe 4 is laid at the bottom of the box 1. When the temperature inside the box 1 is below 35°C, it can be heated through the steam heating pipe 4. This fully utilizes the steam generated by the biogas power plant to heat the waste liquid inside the box 1, which can reduce energy consumption and further improve the hydrolysis and acidification effect.

[0053] As a preferred embodiment of the present invention, a heat insulation layer 5 is provided on the outer side wall of the box 1.

[0054] Specifically, insulation layer 5 is preferably made of insulation cotton, which can be used normally outdoors in winter, reducing the impact of the season on the device and ensuring the quality of the carbon source in winter.

[0055] As a preferred embodiment of the present invention, a temperature monitoring device 6 and a pH detection device 7 are provided in each of the compartments 13.

[0056] Specifically, the temperature and pH of the liquid inside chamber 13 can be detected by temperature monitoring device 6 and pH detection device 7 to facilitate the next step.

[0057] As a preferred embodiment of the present invention, an electrically controlled gear 81 is provided on one side of the fixed partition 14, the electrically controlled gear 81 is connected to a motor, and the motor is located outside the housing 1; a rack 82 matching the electrically controlled gear 81 is provided on the movable partition 16; the rack 82 is arranged along the direction in which the movable partition 16 moves relative to the fixed partition 14.

[0058] Specifically, the electric control gear 81 is rotated by the motor, so that the rack on the movable partition 16 can move relative to the fixed partition 14, thereby controlling the opening and closing of the folding outlet 15.

[0059] As a preferred embodiment of the present invention, a first valve 91 is provided at the inlet end of the inlet pipe 11; a second valve 92 and a first check valve 93 are provided on the outlet pipe 12; a second check valve 94, a third valve 95 and a fourth valve 96 are respectively provided on both sides of the second check valve 94 on the concentrated liquid return pipe 32.

[0060] Specifically, the structural design of valves and check valves facilitates the control of liquid inlet and outlet and avoids liquid backflow.

[0061] As a preferred embodiment of the present invention, filter 31 is an ultrafiltration membrane filter.

[0062] Specifically, when coupled with an ultrafiltration membrane filter, it can intercept some organic nitrogen and ammonia nitrogen in the liquid, reducing the total nitrogen of the carbon source and making the carbon source clearer, free of solid impurities, greatly improving the quality of the carbon source and broadening its applicability. The concentrated liquid produced by the ultrafiltration membrane is refluxed into tank 1, which can reduce the amount of alkali added and increase the total amount of carbon source obtained, thereby reducing costs. The concentrated liquid reflux allows hydrolytic acidifying bacteria and ammonifying bacteria to continuously accumulate, accelerating the hydrolysis and acidification rate and improving the conversion rate of organic nitrogen to ammonia nitrogen.

[0063] like Figure 5 As shown, the method for preparing a carbon source from kitchen waste liquid provided by the present invention uses the apparatus for preparing a carbon source from kitchen waste liquid as described above to prepare a carbon source from kitchen waste liquid; it includes the following steps:

[0064] Step S1: The compartment 13 near the head end of the container 1 is designated as the head compartment, the compartment near the tail end of the container 1 is designated as the tail compartment, the compartment between the head compartment and the tail compartment is designated as the middle compartment, the movable partition 16 between the head compartment and the middle compartment is designated as the first movable partition, and the movable partition 16 between the middle compartment and the tail compartment is designated as the second movable partition.

[0065] Step S2: Both the first and second movable partitions are closed, so that the head compartment and the middle compartment are sealed; and the carbon source prepared in the tail compartment is sent into the filter 31 through the liquid outlet pipe 12.

[0066] Step S3: Use the clear liquid produced by filter 31 as a carbon source product, and send the concentrated liquid produced by filter 31 into the head chamber together with the waste liquid entering through the concentrated liquid return pipe 32 and the inlet pipe 11.

[0067] Step S4: Add industrial alkali into the head chamber and turn on the stirring device 21 in the head chamber to stir the liquid in the head chamber evenly. After adjusting the pH value to 6-6.5, open the first moving partition to allow the liquid in the head chamber to flow into the middle chamber.

[0068] Step S5: After stirring the liquid in the middle compartment evenly by turning on the stirring device 21 in the middle compartment, open the second movable partition to allow the liquid in the middle compartment to enter the tail compartment, and turn on the stirring device 21 in the tail compartment to make the liquid in the tail compartment evenly mixed, thus preparing a carbon source.

[0069] As a preferred embodiment of the present invention, the amount of liquid entering the head compartment is equal to the amount of prepared carbon source delivered from the tail compartment.

[0070] Specifically, the device for preparing carbon sources from kitchen waste liquid provided by this invention has two water inlet modes. The first mode is a sequential batch inlet, for example, discharging 5m³ of water at a time. 3 The carbon source was injected into the liquid again at 5m. 3 The first mode involves adjusting the pH to 6-6.5 while introducing the liquid; the second mode involves continuous water introduction, i.e., introducing 0.2m of liquid. 3 / h, while simultaneously discharging 0.2m of carbon source. 3 / h, the hydraulic residence time for both modes is preferably 8 days.

[0071] As can be seen from the above specific embodiments, the apparatus and method for preparing carbon sources from kitchen organic waste liquid provided by the present invention, through the structural design of the internal partition of the tank, can control the flow state of the liquid in each compartment by adjusting the opening and closing of the movable partition at the baffle. When the movable partition is closed, the waste liquid in each compartment can be fully mixed, improving the efficiency of hydrolysis and acidification, and reducing the problem of carbon source instability caused by uneven mixing. When the movable partition is open, the flow of liquid between different compartments is baffled, increasing the water flow velocity at the narrow baffle. When the liquid passes through the narrow baffle, solid matter deposition is avoided, reducing the size of the device and lowering costs. Compared with the fully mixed design, it can better control the quality of the carbon source. Through the structural design of the filtration and reflux system, some organic nitrogen and ammonia nitrogen in the liquid can be intercepted, reducing the total nitrogen of the carbon source, and making the carbon source clearer without solid impurities, further improving the quality of the carbon source. Moreover, the reflux of the concentrated liquid produced by filtration increases the carbon source preparation volume and reduces the amount of alkali added. The structural design of the tank and the tank cover fastening facilitates the maintenance of the tank interior.

[0072] The apparatus and method for preparing a carbon source from kitchen waste liquid according to the present invention have been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the apparatus and method for preparing a carbon source from kitchen waste liquid according to the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. An apparatus for preparing a carbon source from kitchen waste liquid, characterized in that, Includes the housing, lid, and filtration return system; among which, An opening is provided at the top of the box; an inlet pipe and an outlet pipe are respectively provided at the head and tail ends of the box; the inlet end of the inlet pipe is connected to the kitchen waste liquid generating device; along the length of the box, at least two partitions are provided inside the box to divide the box into at least three compartments. The partition includes fixed partitions alternately arranged on two opposite inner sidewalls of the box body; the bottom end and one side end of the fixed partition are respectively fixed to the inner bottom end of the box body and the inner sidewall of the box body, and the other side end forms a flow deflection port with the other inner sidewall of the box body; a movable partition is slidably arranged on the side of the fixed partition near the flow deflection port; The lid is fastened to the opening of the container body, and a stirring device is provided at the lower end of the lid for each compartment; the stirring device is located inside the compartment. The filtration reflux system includes a filter connected to the outlet pipe and a concentrate reflux pipe connected to the concentrate outlet of the filter; the concentrate outlet of the concentrate reflux pipe is connected to the inlet pipe.

2. The apparatus for preparing a carbon source from kitchen waste liquid according to claim 1, characterized in that, An industrial alkali addition device is installed on the side wall of the compartment near the head end of the container.

3. The apparatus for preparing a carbon source from kitchen organic waste liquid according to claim 1, characterized in that, Each compartment has a steam heating pipe installed at the bottom.

4. The apparatus for preparing a carbon source from kitchen waste liquid according to claim 1, characterized in that, An insulation layer is provided on the outer wall of the enclosure.

5. The apparatus for preparing a carbon source from kitchen waste liquid according to claim 1, characterized in that, Temperature monitoring devices and pH detection devices are installed in each of the cabins.

6. The apparatus for preparing a carbon source from kitchen waste liquid according to claim 1, characterized in that, An electrically controlled gear is provided on one side of the fixed partition, and the electrically controlled gear is connected to a motor, which is located outside the housing; A rack matching the electrically controlled gear is provided on the movable partition; the rack is arranged along the direction in which the movable partition moves relative to the fixed partition.

7. The apparatus for preparing a carbon source from kitchen waste liquid according to claim 1, characterized in that, A first valve is provided at the inlet end of the inlet pipe; A second valve and a first check valve are provided on the liquid outlet pipe; A second check valve, a third valve, and a fourth valve are respectively installed on both sides of the second check valve.

8. The apparatus for preparing a carbon source from kitchen waste liquid according to claim 1, characterized in that, The filter is an ultrafiltration membrane filter.

9. A method for preparing a carbon source from kitchen waste liquid, characterized in that, The apparatus for preparing a carbon source from kitchen waste liquid as described in any one of claims 1-8 comprises the following steps: The compartment near the front end of the container is designated as the head compartment, the compartment near the rear end of the container is designated as the rear compartment, the compartment between the head compartment and the rear compartment is designated as the middle compartment, the movable partition between the head compartment and the middle compartment is designated as the first movable partition, and the movable partition between the middle compartment and the rear compartment is designated as the second movable partition. The first movable partition and the second movable partition are both closed, so that the head compartment and the middle compartment are both sealed; and the carbon source prepared in the tail compartment is sent into the filter through the liquid outlet pipe; The clear liquid produced by the filter is used as a carbon source product, and the concentrated liquid produced by the filter is sent into the head chamber together with the waste liquid entering through the concentrated liquid return pipe and the inlet pipe. Industrial alkali is added to the head chamber, and the stirring device in the head chamber is turned on to stir the liquid in the head chamber evenly. After the pH value is adjusted to 6-6.5, the first movable partition is opened to allow the liquid in the head chamber to flow into the middle chamber. After the liquid in the middle compartment is stirred evenly by activating the stirring device in the middle compartment, the second movable partition is opened to allow the liquid in the middle compartment to enter the tail compartment. The stirring device in the tail compartment is then activated to ensure that the liquid in the tail compartment is mixed evenly, thereby preparing a carbon source.

10. The method for preparing a carbon source from kitchen waste liquid according to claim 9, characterized in that, The amount of liquid entering the head chamber is equal to the amount of prepared carbon source delivered from the tail chamber.

Images