Kitchen waste digestive juice flocculation system
By using temperature control and aeration technology in the food waste digestion liquid flocculation system, the activity of methanogenic bacteria is inhibited, solving the problem of difficult flocculation of food waste digestion liquid, and achieving economical use of flocculants and improved flocculation effect.
Patent Information
- Application Number
- CN202422891392.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Food waste digestate is difficult to flocculate. Existing technologies require increasing the amount of flocculant used to enhance the flocculation effect, which leads to increased costs and poor results.
By installing a temperature control device in the storage tank to quickly cool down the water and aerating the conditioning tank, the activity of methanogenic bacteria is inhibited, the production of methane gas is reduced, and the addition of flocculants kills the methanogenic bacteria, thus improving the flocculation effect.
Reduce the amount of flocculant used, lower costs, improve flocculation effect, and achieve efficient solid-liquid separation.
Smart Images
Figure CN223659941U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of kitchen waste treatment technology, specifically to a kitchen waste digestion liquid flocculation system. Background Technology
[0002] The digestate from anaerobic fermentation of food waste has an extremely complex composition, differing significantly from the coagulation and flocculation processes used for general aerobic sludge and anaerobic waste sludge, primarily in its difficulty in flocculation. Currently, most technologies for solid-liquid separation of food waste digestate focus on selecting appropriate agents or increasing their dosage to enhance flocculation. However, this approach significantly increases the cost of solid-liquid separation, making it difficult to achieve good economic results.
[0003] Researchers have discovered that the reason why digestive fluids are difficult to flocculate is that methanogenic bacteria in the digestive fluids continue to produce methane gas during flocculation. The methane bubbles hinder the flocculation effect of the flocculant, necessitating an increase in the amount of flocculant used. Utility Model Content
[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a flocculation system for kitchen waste digestion liquid, thereby solving the technical problem of difficulty in flocculating digestion liquid after anaerobic fermentation of kitchen waste in the prior art.
[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:
[0006] This utility model provides a flocculation system for kitchen waste digestion liquid, including:
[0007] The storage tank includes a tank body and a temperature control device, which is installed on the tank body to regulate the temperature of the digestive liquid inside the tank.
[0008] The conditioning tank unit includes a conditioning tank, a first inlet pipe, an aeration pipe, and a first flocculant dosing device. The first inlet pipe connects the conditioning tank and the tank body, and the digested liquid flows into the conditioning tank through the inlet pipe. The air outlet of the aeration pipe is located in the conditioning tank to aerate and stir the digested liquid in the conditioning tank. The discharge end of the first flocculant dosing device is connected to the conditioning tank to add flocculant into the conditioning tank.
[0009] In some embodiments, the temperature control device includes a circulation pipe, a radiator, and a circulation pump. The circulation pipe is partially disposed on the tank, and the radiator and the circulation pump are disposed on the circulation pipe. The circulation pump can drive coolant to flow in the circulation pipe to reduce the temperature of the digester in the tank.
[0010] In some embodiments, the circulation pipeline includes an outer pipe and an inner pipe, the outer pipe being arranged to wrap around the outer wall of the storage tank and the inner pipe being arranged to penetrate the storage tank.
[0011] In some embodiments, the inlet of the tank is located at its top, the first inlet pipe is connected to the bottom of the tank, and the coolant in both the outer and inner pipes flows vertically from top to bottom.
[0012] In some embodiments, the conditioning tank unit includes a plurality of conditioning tanks arranged sequentially and connected to each other and a plurality of aeration pipes. The first liquid inlet pipe and the first flocculant dosing device are both connected to the first conditioning tank, and each conditioning tank is provided with an aeration pipe.
[0013] In some embodiments, the inlets of each conditioning tank are alternately located at the top and bottom of the conditioning tank.
[0014] In some embodiments, the system further includes an anaerobic treatment unit, which includes an anaerobic mixing tank, a second inlet pipe, a second flocculant dosing device, and an outlet pipe. The second inlet pipe connects the conditioning tank and the anaerobic mixing tank. The digestate in the conditioning tank can flow into the anaerobic mixing tank through the second inlet pipe. The outlet end of the second flocculant dosing device is connected to the anaerobic mixing tank for adding flocculant into the anaerobic mixing tank. The outlet pipe is connected to the anaerobic mixing tank.
[0015] In some embodiments, an anaerobic mixing chamber is formed with a first chamber and a second chamber, the upper parts of the first chamber and the second chamber are connected, the digestate in the first chamber can overflow into the second chamber, a second inlet pipe and a second flocculant dosing device are connected to the first chamber, and an outlet pipe is connected to the second chamber.
[0016] In some embodiments, the anaerobic treatment unit further includes a stirring device, wherein the stirrer of the stirring device is arranged in the first chamber for stirring the digestate in the first chamber.
[0017] In some embodiments, both the first inlet pipe and the second inlet pipe include two sets of pipes, one set in use and the other set as a backup.
[0018] Compared with the prior art, the food waste digestion liquid flocculation system provided by this utility model has a temperature control device installed on the tank body. After the digestion liquid enters the tank, it is rapidly cooled down, forming a temperature jump, which inhibits the biological activity of methanogenic bacteria and reduces the amount of methane gas produced. At the same time, it also aerates in the conditioning tank to kill anaerobic methanogenic bacteria, further reducing the amount of methane gas produced. This weakens the hindrance effect of methane gas on flocculants and reduces the amount of flocculant used. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the kitchen waste digestion liquid flocculation system provided in this embodiment of the utility model. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0021] To address the technical problem of difficulty in flocculating digestate from anaerobic fermentation of kitchen waste, this invention provides a kitchen waste digestate flocculation system that can improve the flocculation effect of flocculants in kitchen waste digestate and reduce the amount of flocculant used.
[0022] It should be noted that the food waste digestion liquid flocculation system described in this utility model is used for, but not limited to, food waste digestion liquid. For ease of explanation, this utility model only uses the application of the food waste digestion liquid flocculation system to food waste digestion liquid as an example. The principle of the food waste digestion liquid flocculation system applied to other types of digestion liquid is essentially the same as that applied to food waste digestion liquid, and will not be elaborated here.
[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a kitchen waste digestion liquid flocculation system in one embodiment of the present invention. The kitchen waste digestion liquid flocculation system includes a storage tank 1 and a conditioning tank unit 2.
[0024] The storage tank 1 includes a tank body 11 and a temperature control device 12. The temperature control device 12 is installed on the tank body 11 to regulate the temperature of the digestive liquid inside the tank body 11, so that the digestive liquid cools down rapidly, forming a temperature jump, thereby inhibiting the biological activity of methanogenic bacteria and reducing the amount of methane gas produced.
[0025] The conditioning tank unit 2 includes a conditioning tank 21, a first inlet pipe 22, an aeration pipe 23, and a first flocculant dosing device 24. The first inlet pipe 22 connects the conditioning tank 21 to the tank body 11, allowing the digested liquid to flow into the conditioning tank 21 via a height difference or a water pump. The outlet end of the aeration pipe 23 is located inside the conditioning tank 21 to aerate and stir the digested liquid within it. The outlet end of the first flocculant dosing device 24 is connected to the conditioning tank 21 to add flocculant into the tank. Since methanogens are anaerobic, aeration into the digested liquid increases the oxygen content, kills the methanogens, further reduces the amount of methane gas produced, weakens the hindering effect of methane gas on the flocculant, and reduces the amount of flocculant used.
[0026] In some embodiments, the temperature control device 12 can employ a water-cooling principle, including a circulation pipe 121, a radiator, and a circulating water pump. The circulation pipe 121 is partially mounted on the tank 11, and the radiator and circulating water pump are mounted on the circulation pipe 121. The circulating water pump drives coolant to flow within the circulation pipe 121 to lower the temperature of the digestive fluid within the tank 11. The coolant is purified water; after absorbing heat within the tank 11, it dissipates heat through the radiator, returning to low-temperature purified water. The temperature of the digestive fluid is typically 38°C; a rapid temperature drop of only 3°C is sufficient to inhibit the activity of methanogenic bacteria.
[0027] In some embodiments, the circulation pipe 121 includes an outer pipe and an inner pipe. The outer pipe is arranged to wrap around the outer wall of the storage tank 11, and the inner pipe is arranged to penetrate the storage tank. The arrangement of the outer and inner pipes allows the coolant to cool both the outside and inside of the digestive fluid simultaneously, achieving a better cooling effect and preventing the methanogens from maintaining their biological activity due to slow internal temperature changes.
[0028] In some embodiments, the liquid inlet of the tank 11 is located at its top, and the first liquid inlet pipe 22 connects to the bottom of the tank 11. The flow direction of the coolant in both the outer and inner pipes is from top to bottom in the longitudinal direction. It is easy to understand that as the coolant absorbs heat and heats up in the tank 11, its cooling effect gradually decreases. Therefore, the cooling effect of the coolant is best when it first enters the tank 11.
[0029] When the inlet of tank 11 is located at its top, the digestive liquid that just enters tank 11 has the highest temperature and comes into contact with the coolant with the lowest temperature. The temperature difference between the two is the largest, which produces the best cooling effect and causes the methanogens in the digestive liquid to be quickly inactivated.
[0030] In some embodiments, the conditioning tank unit 2 includes a plurality of conditioning tanks 21 arranged sequentially and connected to each other and a plurality of aeration pipes 23. The first liquid inlet pipe 22 and the first flocculant dosing device 24 are both connected to the first conditioning tank 21, and each conditioning tank 21 is provided with an aeration pipe 23. The first flocculant dosing device 24 adds polyferric chloride dry powder to the first conditioning tank 21.
[0031] In some embodiments, the inlets of each conditioning tank 21 are alternately located at the top and bottom of the conditioning tank 21. That is, the first inlet pipe 22 is connected to the top of the first conditioning tank 21, the first conditioning tank 21 is connected to the bottom of the second conditioning tank 21, the second conditioning tank 21 is connected to the top of the third conditioning tank 21, and so on.
[0032] In some embodiments, the food waste digestate flocculation system further includes an anaerobic treatment unit 3, which includes an anaerobic mixing tank 31, a second inlet pipe 32, a second flocculant dosing device 33, and an outlet pipe 34. The second inlet pipe 32 connects the conditioning tank 21 and the anaerobic mixing tank 31, and the digestate in the conditioning tank 21 can flow into the anaerobic mixing tank 31 through the second inlet pipe 32 via a height difference or a water pump. In this embodiment, the second inlet pipe 32 connects to the last conditioning tank 21. The outlet end of the second flocculant dosing device 33 is connected to the anaerobic mixing tank 31 for adding the flocculant polyaluminum chloride into the anaerobic mixing tank 31. The outlet pipe 34 is connected to the anaerobic mixing tank 31 for discharging the flocculated digestate for sedimentation and separation.
[0033] In some embodiments, the anaerobic mixing chamber 31 has a first chamber 311 and a second chamber 312, which are connected at the top. The digestate in the first chamber 311 can overflow into the second chamber 312. The second inlet pipe 32 and the second flocculant dosing device 33 are connected to the first chamber 311, and the outlet pipe 34 is connected to the second chamber 312.
[0034] In some embodiments, the anaerobic treatment unit 3 further includes a stirring device 35, the stirrer of which is arranged in the first chamber 311 to stir the digestate in the first chamber 311. The stirring device 35 can be driven by a motor to rotate the stirrer, so that the digestate and flocculant in the first chamber 311 are mixed evenly before flowing into the second chamber 312.
[0035] In some embodiments, the first inlet pipe 22 and the second inlet pipe 32 each include two sets of pipes, one set for use and the other set as a backup.
[0036] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.
Claims
1. A flocculation system for kitchen waste digestion liquid, characterized in that, include: A storage tank, comprising a tank body and a temperature control device, wherein the temperature control device is disposed on the tank body for adjusting the temperature of the digestive liquid inside the tank; The conditioning tank unit includes a conditioning tank, a first inlet pipe, an aeration pipe, and a first flocculant dosing device. The first inlet pipe connects the conditioning tank to the tank body, and the digestate flows into the conditioning tank through the inlet pipe. The outlet end of the aeration pipe is located in the conditioning tank to aerate and stir the digestate in the conditioning tank. The outlet end of the first flocculant dosing device is connected to the conditioning tank to add flocculant into the conditioning tank.
2. The food waste digestion liquid flocculation system according to claim 1, characterized in that, The temperature control device includes a circulation pipe, a radiator, and a circulating water pump. The circulation pipe is partially installed on the tank, and the radiator and the circulating water pump are installed on the circulation pipe. The circulating water pump can drive the coolant to flow in the circulation pipe to reduce the temperature of the digested liquid in the tank.
3. The food waste digestion liquid flocculation system according to claim 2, characterized in that, The circulation pipeline includes an outer pipe and an inner pipe. The outer pipe is arranged to wrap around the outer wall of the storage tank, and the inner pipe is arranged to pass through the storage tank.
4. The food waste digestion liquid flocculation system according to claim 3, characterized in that, The liquid inlet of the tank is located at its top, and the first liquid inlet pipe is connected to the bottom of the tank. The flow direction of the coolant in the outer pipe and the inner pipe in the longitudinal direction is from top to bottom.
5. The food waste digestion liquid flocculation system according to claim 1, characterized in that, The conditioning tank unit includes multiple conditioning tanks arranged sequentially and connected to each other, and multiple aeration pipes. The first liquid inlet pipe and the first flocculant dosing device are both connected to the first conditioning tank, and each conditioning tank is equipped with an aeration pipe.
6. The food waste digestion liquid flocculation system according to claim 5, characterized in that, The inlets of each conditioning tank are alternately located at the top and bottom of the conditioning tank.
7. The food waste digestion liquid flocculation system according to claim 1, characterized in that, It also includes an anaerobic treatment unit, which includes an anaerobic mixing tank, a second inlet pipe, a second flocculant dosing device, and an outlet pipe. The second inlet pipe connects the conditioning tank and the anaerobic mixing tank. The digestate in the conditioning tank can flow into the anaerobic mixing tank through the second inlet pipe. The outlet end of the second flocculant dosing device is connected to the anaerobic mixing tank for adding flocculant into the anaerobic mixing tank. The outlet pipe is connected to the anaerobic mixing tank.
8. The food waste digestion liquid flocculation system according to claim 7, characterized in that, The anaerobic mixing chamber contains a first chamber and a second chamber, which are connected at the top. The digestive liquid in the first chamber can overflow into the second chamber. The second inlet pipe and the second flocculant dosing device are connected to the first chamber, and the outlet pipe is connected to the second chamber.
9. The food waste digestion liquid flocculation system according to claim 8, characterized in that, The anaerobic treatment unit also includes a stirring device, wherein the stirrer of the stirring device is arranged in the first chamber for stirring the digestive liquid in the first chamber.
10. The food waste digestion liquid flocculation system according to claim 7, characterized in that, Both the first inlet pipe and the second inlet pipe include two sets of pipes, one set for use and the other set as a spare.