Sectional type organic wastewater fermentation reactor

Abstract

The utility model relates to a sectional type organic wastewater fermentation reactor which comprises a hydrolysis unit, an acidification unit and a detection unit, the hydrolysis unit comprises a hydrolysis tank, a steam heating pipe, a scum reflux pipe, a scum reflux pump and an inclined plate filter, a vertical baffle plate is arranged in the hydrolysis tank, the steam heating pipe is arranged at the lower part of the hydrolysis tank, and the inclined plate filter is arranged at the rear part of the hydrolysis tank; the acidification unit comprises an acidification pool, a water distribution tank, a first partition plate, a second partition plate, a plurality of transverse baffle plates, a blow-off pipe and a sludge return pipe, the acidification pool is internally provided with the first partition plate and the second partition plate and is divided into a scum area, a reaction area and a water outlet area, and the reaction area is internally provided with at least two transverse baffle plates for wastewater to flow from top to bottom; a water distribution tank is arranged at the upper part of the water inlet area of the acidification pool, an outlet of the water distribution tank is positioned on the uppermost transverse baffle plate, and a plurality of small water outlet holes formed in the bottom of the water distribution tank are opposite to the scum area. The device is reasonable and compact in structure and stable in operation, effectively solves the problem of scum roof collapse, and improves the hydrolytic acidification efficiency.

Description

Technical Field

[0001] This utility model relates to a segmented organic wastewater fermentation reactor, belonging to the field of kitchen wastewater treatment technology. Background Technology

[0002] The aqueous phase of pretreated food waste, also known as the three-phase effluent, is currently treated by directly feeding it into an anaerobic digester for a 30-45 day anaerobic reaction. This process involves hydrolysis, acidification, acetic acid production, and methanogenesis to achieve resource utilization of the food waste. However, the long methanogenesis cycle in a stable anaerobic environment results in a large anaerobic digester, increasing investment and operating costs. Certain technologies can be employed to complete the hydrolysis and acidification of the three-phase effluent in a shorter time. This added hydrolysis and acidification process not only shortens the biogas production cycle but also optimizes the anaerobic process.

[0003] Hydrolysis and acidification are fermentation processes that play a crucial role in wastewater treatment. Existing hydrolysis-acidification reactors utilize a single hydrolysis-acidification tank, divided into five compartments by partition walls. The bottom of the first compartment contains a sludge hopper, and each subsequent compartment is vertically separated into descending and ascending flow zones by baffles. The ascending flow zone contains elastic packing material, and the bottom is equipped with sludge discharge and aeration pipes. This hydrolysis-acidification reactor optimizes the hydraulic flow through its baffle structure and reduces sludge loss through high-density packing material in the last compartment, thus improving the hydrolysis-acidification effect. However, existing hydrolysis-acidification reactors are only suitable for treating wastewater with low organic matter concentrations and are not applicable to high-concentration organic wastewater such as kitchen wastewater.

[0004] Because the three-phase effluent from kitchen wastewater is a high-concentration organic wastewater, and high-concentration organic matter produces a large amount of volatile fatty acids (VFA) during acidification, which in turn generates a large amount of gas (CO2, etc.). These bubbles carry a large amount of unhydrolyzed organic food residue, forming scum. Although this scum has a high COD, it causes a large amount of scum to rise from the top of the reactor. Therefore, the scum problem in hydrolysis acidification is solved by increasing the equipment height and continuously scraping off the scum and treating it separately, resulting in a large reactor volume and increasing treatment steps and costs. Secondly, the existing hydrolysis acidification reactor uses a single reaction tank for hydrolysis acidification treatment. Although multiple baffles can optimize the hydraulic flow, the hydrolysis section and the acidification section are not clearly separated. In particular, sludge tends to accumulate at the bottom of the reactor, which actually affects the hydrolysis acidification effect. Summary of the Invention

[0005] The purpose of this invention is to provide a segmented organic wastewater fermentation reactor that has a reasonable and compact structure, stable operation, effectively solves the problem of scum overflow, and improves the efficiency of hydrolysis and acidification.

[0006] The technical solution of this utility model to achieve the above-mentioned objectives is a segmented organic wastewater fermentation reactor, characterized in that it includes a hydrolysis unit, an acidification unit, and a detection unit;

[0007] The hydrolysis unit includes a hydrolysis tank, a steam heating pipe, a scum return pipe, a scum return pump, and an inclined plate filter. The hydrolysis tank is provided with at least two staggered vertical baffles along the water flow direction. An inlet is provided at the bottom of the hydrolysis tank. A steam heating pipe with multiple steam outlets is provided at the bottom of the hydrolysis tank. An inclined plate filter is provided at the upper part between the rear vertical baffles and the tank wall. An overflow port is provided on the outlet side of the hydrolysis tank above the inclined plate filter. One end of the scum return pipe is connected to the outlet at the bottom of the scum zone, and the other end is located in the hydrolysis tank. A scum return pump is installed on the scum return pipe.

[0008] The acidification unit includes an acidification tank, a water distribution tank, a first baffle, a second baffle, multiple transverse baffles, a sewage discharge pipe, and a sludge return pipe. The first baffle is vertically placed inside the acidification tank and divides the tank into an inlet zone and an outlet zone. The bottom of the first baffle has a flow channel for wastewater to flow into the outlet zone, and the acidification tank has an outlet at the top of the outlet zone. The second baffle in the inlet zone divides the inlet zone into an independent scum zone and a reaction zone, and the reaction zone has a sedimentation zone at the bottom. At least two transverse baffles are provided in the reaction zone for wastewater to flow from top to bottom. The acidification tank has a water distribution trough at the top of the inlet area. The inlet of the water distribution trough is connected to the overflow outlet of the hydrolysis tank, and the outlet is located at the uppermost horizontal baffle plate. Multiple small outlet holes at the bottom of the water distribution trough are opposite to the scum area. One end of the sludge discharge pipe is connected to the sludge outlet at the bottom of the sedimentation zone. One end of the sludge return pipe is connected to the sewage discharge pipe, and the other end is located in the reaction zone of the acidification tank. The sludge return pipe is connected to the sludge distribution pipes located at each horizontal baffle plate, and each sludge distribution pipe has multiple outlet holes. The sludge return pipe is equipped with a sludge return pump.

[0009] The detection unit includes a first online pH meter and a second online pH meter. The measuring end of the first online pH meter is set in the hydrolysis tank to detect the pH value of the wastewater during hydrolysis, and the measuring end of the second online pH meter is set in the reaction zone to detect the pH value of the wastewater during acidification.

[0010] This utility model's hydrolysis-acidification reactor employs independent hydrolysis and acidification tanks, conducting hydrolysis and acidification reactions separately. This segmented treatment achieves optimal operating conditions and facilitates the cultivation of hydrolytic and acidifying bacteria, as well as efficient hydrolysis-acidification reactions. By separating hydrolysis and acidification, the lower pH of the hydrolysis tank inhibits the acidification reaction, while the total saturation (TS) concentration is higher in the acidification tank. This significantly reduces the thickness of the scum layer in the acidification tank, thereby lowering the reaction height, reducing reactor volume, and saving investment costs.

[0011] This invention features multiple vertical baffles within the hydrolysis tank. While extending the water flow path, the wastewater in the hydrolysis section is heated by steam heating pipes, ensuring thorough hydrolysis of the three-phase water within the tank. The larger particle size is retained by an inclined plate filter to continue hydrolysis into a reverse-phase particle, while the smaller particle size enters the acidification tank for acidification. This allows for separate control of different operating parameters in the hydrolysis and acidification sections, thereby improving hydrolysis and acidification efficiency and shortening hydrolysis and acidification time.

[0012] This invention uses a first and second partition to divide the acidification tank into a scum zone, a reaction zone, and an effluent zone. Multiple transverse baffles are installed in the reaction zone to enhance the water flow path, increasing the contact area and time between wastewater and sludge. Simultaneously, the baffles allow scum to rise and enter the scum zone more effectively, before returning it to the hydrolysis tank. This scum recycling and hydrolysis treatment significantly reduces the thickness of the scum layer in the acidification zone, retaining some COD from the scum while reducing the risk of scum floating. Furthermore, this invention includes sludge distribution pipes on the transverse baffles, allowing sludge to return and redistribute through the pipes. This significantly reduces sludge deposition on the baffles, ensuring even distribution of sludge in the acidification zone and effectively preventing short-circuiting or dead zones, thereby improving overall acidification efficiency. Attached Figure Description

[0013] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of a segmented organic wastewater fermentation reactor according to this utility model.

[0015] Wherein: 1—Hydrolysis tank, 1-1—Inlet, 2—Steam heating pipe, 3—Vertical baffle, 4—Scum return pipe, 5—Scum return pump, 6—Scum shut-off valve, 7—Second baffle, 8—Horizontal baffle, 9—Sewage shut-off valve, 10—Sludge distribution pipe, 11—Acidification tank, 11-1—Scum zone, 11-2—Reaction zone, 11-3—Sedimentation zone, 11-4—Effluent zone, 11-5—Effluent outlet, 12—Sewage pipe, sludge return pump, 13—Sludge return pipe, 14—Sludge return shut-off valve, 15—Temperature sensor, 16—First pH online detector, 17—Inclined plate filter, 18—Water distribution trough, 19—First baffle, 20—Second pH online detector, 21—Sludge return pump. Detailed Implementation

[0016] See Figure 1 As shown, the present invention provides a segmented organic wastewater fermentation reactor, which includes a hydrolysis unit, an acidification unit, and a detection unit.

[0017] See Figure 1 As shown, the hydrolysis unit of this utility model includes a hydrolysis tank 1, a steam heating pipe 2, a scum return pipe 4, a scum return pump 5, and an inclined plate filter 17. The lower part of the hydrolysis tank 1 has an inlet 1-1, through which three-phase effluent is introduced into the hydrolysis tank 1 for hydrolysis treatment. The lower part of the hydrolysis tank 1 has multiple steam heating pipes 2 with steam outlets, which heat the wastewater in the hydrolysis section, enhancing the hydrolysis reaction and converting some organic matter from a solid to a liquid state. The hydrolysis tank 1 has at least two staggered vertical baffles 3 along the water flow direction. The vertical baffles 3 are connected to the tank wall, so the wastewater flows from the top to the rear through the front vertical baffles 3, and then from the rear vertical baffles... The bottom of plate 3 flows upward to extend the water flow path, allowing the three-phase water to be fully hydrolyzed in the hydrolysis tank 1, thereby improving the hydrolysis reaction efficiency. An inclined plate filter 17 is installed at the upper part between the rear vertical baffle plate 3 and the tank wall of the hydrolysis tank 1. An overflow port is provided on the outlet side of the inclined plate filter 17 in the hydrolysis tank 1. The wastewater entering the acidification section is filtered through the inclined plate filter 17. The filtered wastewater with small particle sizes enters the acidification tank 11 through the overflow port for acidification treatment. Larger wastewater particles are retained by the inclined plate filter 17 and continue to undergo hydrolysis in the hydrolysis tank 1. See [link to relevant documentation]. Figure 1 As shown, one end of the scum return pipe 4 of this utility model is connected to the outlet at the bottom of the scum zone 11-1, and the other end is set in the hydrolysis tank 1. A scum return pump 5 is installed on the scum return pipe 4. Therefore, a large amount of scum generated during acidification is collected in the scum zone 11-1 and pumped into the hydrolysis tank 1 by the scum return pump 5. The scum is hydrolyzed through circulation, thereby realizing resource utilization and significantly reducing the thickness of the scum layer in the acidification zone.

[0018] See Figure 1As shown, the scum return pipe 4 of this utility model is provided with scum stop valves 6 on both sides of the scum return pump 5. The scum stop valves 6 cooperate with the scum return pump 5 to realize the control and maintenance of scum return. The other end of the scum return pipe 4 is located at the water inlet 1-1, which can return the scum to the front of the hydrolysis tank 1 and carry out the hydrolysis reaction together with the water.

[0019] See Figure 1 As shown, the acidification unit of this utility model includes an acidification tank 11, a water distribution tank 18, a first partition 19, a second partition 7, multiple transverse baffles 8, a sewage pipe 12, and a sludge return pipe 13. The acidification tank 11 is connected to the hydrolysis tank 1, and the two tanks can share a common tank wall. The first partition 19 is vertically placed in the acidification tank 11 to divide the acidification tank 11 into an inlet area and an outlet area 11-4. The bottom of the first partition 19 is provided with a downflow channel for wastewater to flow to the outlet area 11-4, and the acidification tank 11 is provided with an outlet 11-5 at the top of the outlet area 11-4. Therefore, the wastewater after acidification treatment enters the outlet area 11-4 through the downflow channel at the bottom of the first partition 19 and is discharged through the outlet 11-5 to enter the subsequent treatment.

[0020] See Figure 1 As shown, the acidification tank 11 of this utility model is provided with a second baffle 7 in the inlet area, which divides the inlet area into an independent scum zone 11-1 and a reaction zone 11-2. The lower part of the reaction zone 11-2 is provided with a sedimentation zone 11-3. Therefore, when the kitchen wastewater is acidified efficiently, the scum generated overflows into the scum zone 11-1 through the second baffle 7, which isolates the scum. The scum enters the hydrolysis tank 1 through the scum return pipe 4 and mixes with the hydrolysate before continuing to hydrolyze in the hydrolysis zone. While retaining some COD in the scum, the risk of scum floating is greatly reduced, and the working reliability of the reactor is improved.

[0021] See Figure 1 As shown, the second partition 7 of this utility model is an arc-shaped partition or an inclined partition. The lower end of the second partition 7 is fixed to the pool wall, and the upper end is close to the outlet of the water distribution trough 18 and located above the uppermost horizontal baffle 8. A scum channel is provided between the upper end of the second partition 7 and the water distribution trough 18. Therefore, the area of ​​the scum zone 11-1 can be increased in a limited space, so that the scum on the upper part of the wastewater can smoothly enter the scum zone 11-1 through the second partition 7.

[0022] See Figure 1 As shown, the reaction zone 11-2 of this utility model is equipped with at least two transverse baffles 8 for wastewater to flow from top to bottom. Multiple transverse baffles 8 enhance the flow path of the added water, disturbing the wastewater and thus increasing the contact area and time between the wastewater and sludge, improving acidification efficiency, and shortening treatment time. See Figure 1As shown, the acidification tank 11 of this utility model is provided with a water distribution trough 18 at the upper part of the water inlet area. The water inlet of the water distribution trough 18 is connected to the overflow outlet of the hydrolysis tank 1, and the water outlet is located at the uppermost horizontal baffle plate 8. Multiple small water outlet holes at the bottom of the water distribution trough 18 are opposite to the scum area 11-1. The wastewater after hydrolysis and filtration is discharged to the uppermost horizontal baffle plate 8 through the water distribution trough 18, where it undergoes acidification treatment in the acidification tank 11. After sedimentation, it enters the water outlet area 11-4. At the same time, a small portion of the hydrolyzed wastewater enters the scum area 11-1 through the small water outlet holes on the water distribution trough 18 to reduce the pH of the scum in the scum area 11-1, so that the scum enters the hydrolysis tank 1 without affecting the pH value of the wastewater in the hydrolysis tank 1.

[0023] See Figure 1 As shown, one end of the sludge discharge pipe of this utility model is connected to the sludge outlet of the sedimentation zone 11-3. One end of the sludge return pipe 13 is connected to the sewage discharge pipe 12, and the other end is located in the reaction zone 11-2 of the acidification tank 11. The sludge in the sedimentation zone 11-3 can be discharged through the sludge discharge pipe. The sludge return pipe 13 is connected to the sludge distribution pipe 10 located at each of the transverse baffles 8, and each sludge distribution pipe 10 is provided with multiple water outlet holes. On the one hand, this is used to prevent sludge from settling on the transverse baffles 8, and on the other hand, to maintain the concentration of sludge in the acidification tank 11. The sludge return pipe 13 is equipped with a sludge return pump 21. Through the sludge return pipe 13 and the sludge return pump 21, the sludge is led through the sludge distribution pipe 10 to each of the transverse baffles 8. The sludge is evenly distributed in the acidification zone, ensuring the acidification efficiency. See Figure 1 As shown, the transverse baffles 8 of this utility model are fixed on the pool wall, and the transverse baffles 8 are staggered and sequentially form flow channels with the second partition 7 and the first partition 19.

[0024] See Figure 1 As shown, the sludge distribution pipes 10 of this utility model are arranged in a plurality of hollow transverse baffles 8, and the top of the transverse baffles 8 is provided with orifices corresponding to the water outlet holes on each sludge distribution pipe 10, or the sludge distribution pipes 10 are arranged in a plurality of ways on the upper surface of the transverse baffles 8. Therefore, the sludge is evenly distributed on the transverse baffles 8 through the plurality of sludge distribution pipes 10.

[0025] See Figure 1 As shown, the sedimentation zone 11-3 of the acidification tank 11 of this utility model is a V-shaped trough to reduce the impact of water flow on the sedimented sludge. The sewage pipe 12 is equipped with a sewage discharge stop valve 9 on the front side of the sludge return pipe 13. The sludge return pipe 13 is equipped with a sludge return stop valve 14 on the water inlet side of the sludge return pump 21. The sludge discharge and sludge return are controlled by the sludge return stop valve 14, the sewage discharge stop valve 9 and the sludge return pump 21.

[0026] See Figure 1As shown, the detection unit of this utility model includes a first online pH meter 16 and a second online pH meter 20. The measuring end of the first online pH meter 16 is set inside the hydrolysis tank 1 to detect the pH value of the wastewater during hydrolysis. The measuring end of the second online pH meter 20 is set inside the reaction zone 11-2 to detect the pH value of the wastewater during acidification, so as to accurately control the pH value of the wastewater during the reaction in the hydrolysis tank 1 and the acidification tank 11. The detection unit of this utility model also includes a temperature sensor 15. The measuring end of the temperature sensor 15 is set inside the hydrolysis tank 1 to detect the temperature of the wastewater in the hydrolysis tank 1, so as to control the hydrolysis section and the acidification section to the optimal operating state.

Claims

1. A segmented organic wastewater fermentation reactor, characterized in that: Includes hydrolysis unit, acidification unit, and detection unit; The hydrolysis unit includes a hydrolysis tank (1), a steam heating pipe (2), a scum return pipe (4), a scum return pump (5), and an inclined plate filter (17). The hydrolysis tank (1) is provided with at least two vertical baffles (3) of different heights along the water flow direction. The lower part of the hydrolysis tank (1) is provided with an inlet (1-1). The lower part of the hydrolysis tank (1) is provided with a steam heating pipe (2) with multiple steam outlets. The upper part between the rear vertical baffle (3) and the tank wall of the hydrolysis tank (1) is provided with an inclined plate filter (17). The hydrolysis tank (1) is provided with an overflow port on the water outlet side above the inclined plate filter (17). One end of the scum return pipe (4) is connected to the outlet at the bottom of the scum zone (11-1), and the other end is located in the hydrolysis tank (1). The scum return pump (5) is installed on the scum return pipe (4). The acidification unit includes an acidification tank (11), a water distribution tank (18), a first baffle (19), a second baffle (7), multiple transverse baffles (8), a sewage pipe (12), and a sludge return pipe (13). The first baffle (19) is vertically placed in the acidification tank (11) and divides the acidification tank (11) into an inlet area and an outlet area (11-4). The bottom of the first baffle (19) is provided with a downflow channel for wastewater to flow into the outlet area (11-4), and the acidification tank (11) is provided with an outlet (11-5) at the top of the outlet area (11-4). The acidification tank (11) is provided with a second baffle (7) in the inlet area and divides the inlet area into an independent scum area (11-1) and a reaction area (11-2). The bottom of the reaction area (11-2) is provided with a sedimentation area (11-3). The reaction area (11-2) is provided with at least two transverse baffles. Plate (8) is used for wastewater to flow from top to bottom; the acidification tank (11) is provided with a water distribution trough (18) at the top of the inlet area. The inlet of the water distribution trough (18) is connected to the overflow outlet of the hydrolysis tank (1), and the outlet is located at the uppermost horizontal baffle plate (8). The bottom of the water distribution trough (18) has multiple small outlet holes opposite to the scum zone (11-1); one end of the sludge discharge pipe is connected to the sludge discharge pipe at the bottom of the sedimentation zone (11-3). The sludge return pipe (13) is connected to the sewage pipe (12) at one end and set in the reaction zone (11-2) of the acidification tank (11) at the other end. The sludge return pipe (13) is connected to the sludge distribution pipe (10) set at each horizontal baffle (8). Each sludge distribution pipe (10) is provided with multiple water outlet holes. The sludge return pipe (13) is provided with a sludge return pump (21). The detection unit includes a first online pH meter (16) and a second online pH meter (20). The measuring end of the first online pH meter (16) is set in the hydrolysis tank (1) to detect the pH value of the wastewater during hydrolysis. The measuring end of the second online pH meter (20) is set in the reaction zone (11-2) to detect the pH value of the wastewater during acidification.

2. The segmented organic wastewater fermentation reactor according to claim 1, characterized in that: The sludge distribution pipe (10) consists of multiple pipes arranged in a hollow horizontal baffle plate (8), and the top of the horizontal baffle plate (8) is provided with an orifice corresponding to the water outlet hole on each sludge distribution pipe (10).

3. The segmented organic wastewater fermentation reactor according to claim 1, characterized in that: Multiple sludge distribution pipes (10) are arranged on the upper surface of the transverse baffle (8).

4. The segmented organic wastewater fermentation reactor according to claim 1, characterized in that: The second partition (7) is an arc-shaped partition or an inclined partition. The lower end of the second partition (7) is fixed to the pool wall, and the upper end is close to the outlet of the water distribution trough (18) and located above the uppermost horizontal baffle (8). A scum channel is provided between the upper end of the second partition (7) and the water distribution trough (18).

5. A segmented organic wastewater fermentation reactor according to claim 1, characterized in that: The transverse baffles (8) are fixed on the pool wall, and each transverse baffle (8) is staggered and sequentially connected with the second partition (7) and the first partition (19) to form flow channels.

6. A segmented organic wastewater fermentation reactor according to claim 1, characterized in that: The sedimentation zone (11-3) of the acidification tank (11) is a V-shaped trough. The sewage pipe (12) is provided with a sewage shut-off valve (9) on the front side of the sludge return pipe (13). The sludge return pipe (13) is provided with a sludge return shut-off valve (14) on the water inlet side of the sludge return pump (21).

7. A segmented organic wastewater fermentation reactor according to claim 1, characterized in that: The scum return pipe (4) is located on both sides of the scum return pump (5) and is equipped with scum stop valves (6). The other end of the scum return pipe (4) is located at the inlet (1-1).

8. A segmented organic wastewater fermentation reactor according to claim 1, characterized in that: The detection unit is also equipped with a temperature sensor (15), the detection end of which is set in the hydrolysis tank (1) and detects the temperature of the wastewater in the hydrolysis tank (1).

Images