An anaerobic hydrolysis system and its control method

Abstract

The present invention provides an anaerobic hydrolysis system and its control method, including a hydrolysis reactor, a turbulent mixer, a central stirrer, a circulating liquid flow device and a control system. The control system is respectively connected to the hydrolysis reactor, the turbulent mixer, the central stirrer and the circulating liquid flow device by signals. The control system respectively controls the hydrolysis reactor, the turbulent mixer, the central stirrer and the circulating liquid flow device according to the detection results of the products. It can provide the alkalinity, strains and temperature required for hydrolysis according to the demand. The turbulent mixer is used to realize the rapid mixing of kitchen waste and strains. Through the feed diversion and the circulating spray of the liquid-phase hydrolysis solution, the leaching hydrolysis of kitchen waste is accelerated, the phase change efficiency of the solid phase in kitchen waste and the hydrolysis efficiency of kitchen waste are improved, and the efficiency of making organic composite carbon source for sewage treatment from the hydrolysis solution of kitchen waste is improved. At the same time, through the reflux of anaerobic digestion liquid, the cost and energy loss of making organic composite carbon source from kitchen waste are significantly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment and kitchen waste treatment, and particularly relates to an anaerobic hydrolysis system and a control method thereof. Background Art

[0002] At present, the treatment process of kitchen waste in China mainly adopts the process of "pretreatment + anaerobic digestion". Due to factors such as residents' classification habits, source classification supervision, regional dietary characteristics, and seasonal products, the existing process has problems such as complex pretreatment process, poor process operation stability, high impurity content, and low gas production. Ways to reduce operating costs and increase the added value of kitchen waste treatment products need to be further studied and explored.

[0003] Currently, the problem of insufficient carbon-nitrogen ratio generally exists in sewage in China. Due to the low B / C in sewage, the conventional denitrification process cannot meet the demand for carbon sources in the denitrification section, and a large amount of carbon sources need to be added to achieve the up-to-standard discharge of sewage, especially for high-ammonia-nitrogen wastewater such as kitchen waste, wastewater after anaerobic digestion of kitchen waste, and landfill leachate. In the existing related patents on preparing carbon sources for sewage treatment from kitchen waste, there are disadvantages such as low fermentation efficiency, long fermentation time, and high cost, which limit the utilization and promotion of the organic composite carbon source prepared from kitchen waste as a commercial carbon source.

[0004] Meanwhile, the existing hydrolysis reaction process requires the simultaneous participation of kitchen waste, anaerobic digestion liquid, and hydrolytic acidification bacteria. Since the solid impurities contained in kitchen waste are likely to block the feeding pipeline, it is likely to affect the final mixed product, which can neither ensure the timeliness of feeding nor ensure the real-time and effective adjustment of the feeding amount. In addition, the direct discharge or improper recycling of the hydrolysis liquid will lead to waste of the hydrolysis liquid.

[0005] Therefore, there is an urgent need to provide an anaerobic hydrolysis system and a control method thereof to solve the defects and deficiencies existing in the above-mentioned prior art. Summary of the Invention

[0006] To solve the defects and deficiencies existing in the above-mentioned prior art, the present invention provides an anaerobic hydrolysis system and a control method thereof.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An anaerobic hydrolysis system, characterized in that: it includes a hydrolysis reactor, a turbulent mixer, a central stirrer, a circulating liquid flow device, and a control system, wherein,

[0009] The turbulent mixer is arranged at the top of the hydrolysis reactor and is communicated with the inside of the hydrolysis reactor. Kitchen waste, anaerobic digestion liquid, and hydrolytic acidification bacteria all enter the inside of the hydrolysis reactor through the turbulent mixer;

[0010] The central agitator is arranged at the inner top of the hydrolysis reactor, and the central agitator is connected to an external power source;

[0011] The circulating liquid flow devices are respectively arranged at the inlet end and the outlet end of the hydrolysis reactor;

[0012] The control system is respectively connected to the hydrolysis reactor, turbulent mixer, central agitator and circulating liquid flow device by signals, and the control system controls the hydrolysis reactor, turbulent mixer, central agitator and circulating liquid flow device accordingly according to the detection results of the products.

[0013] As a further preferred embodiment of the present invention, the hydrolysis reactor includes an upper shell and a lower shell that are interconnected, a screen is provided at the internal connecting position of the upper shell and the lower shell, a backwash nozzle is provided at the lower end of the screen, the backwash nozzle is connected to a booster pump through a solenoid valve, and the solenoid valve and the booster pump are connected to the control system signal.

[0014] As a further preferred embodiment of the present invention, the upper shell is configured to be cylindrical, and a solid slag outlet is provided at the outer bottom of the upper shell.

[0015] As a further preferred embodiment of the present invention, the lower shell is configured to be conical, a circulating liquid outlet is provided at the outer bottom of the lower shell, and a carbon source outlet is provided at the bottom end of the lower shell.

[0016] As a further preferred embodiment of the present invention, the turbulent mixer includes a mixing shell, a plurality of spiral sheet groups are arranged inside the mixing shell, a kitchen waste feed port is opened at the outer end of the mixing shell, an anaerobic digestion liquid feed port and a hydrolysis acidification bacteria supplement port are respectively opened at the top of the mixing shell, and a feed guide port extending along the inner wall of the hydrolysis reactor is also arranged inside the connection position between the mixing shell and the hydrolysis reactor.

[0017] As a further preferred embodiment of the present invention, the spiral sheet group includes 6 groups of spiral sheets connected end to end in sequence, the kitchen waste feed port is arranged on the outside of the first spiral sheet, the anaerobic digestion liquid feed port is arranged on the top of the first spiral sheet, and the hydrolysis and acidification bacteria supplement port is arranged on the top of the third spiral sheet. The control system can respectively perform corresponding control on the 6 groups of spiral sheets.

[0018] As a further preferred embodiment of the present invention, when the concentration in the detection result of the product is higher than the preset concentration threshold, the control system first controls to increase the rotation speeds of the fifth helical blade and the sixth helical blade, and controls the increasing speed of the rotation speed of the fifth helical blade to be higher than that of the sixth helical blade; when the concentration in the detection result is still higher than the preset concentration threshold after the preset time, the control system then controls to increase the rotation speeds of the first helical blade and the second helical blade, and controls the increasing speed of the rotation speed of the first helical blade to be lower than that of the second helical blade;

[0019] When the concentration in the detection result of the product is lower than the preset concentration threshold, the control system first controls to decrease the rotation speeds of the fifth helical blade and the sixth helical blade, and controls the decreasing speed of the rotation speed of the fifth helical blade to be lower than that of the sixth helical blade; when the concentration in the detection result is still lower than the preset concentration threshold after the preset time, the control system then controls to decrease the rotation speeds of the first helical blade and the second helical blade, and controls the decreasing speed of the rotation speed of the first helical blade to be lower than that of the second helical blade;

[0020] When the alkalinity in the detection result of the product is higher than the preset alkalinity threshold, the control system first controls to increase the rotation speeds of the fifth helical blade and the sixth helical blade, and controls the increasing speed of the rotation speed of the fifth helical blade to be higher than that of the sixth helical blade; when the alkalinity in the detection result is still higher than the preset alkalinity threshold after the preset time, the control system then controls to increase the rotation speeds of the third helical blade and the fourth helical blade, and controls the increasing speed of the rotation speed of the third helical blade to be higher than that of the fourth helical blade;

[0021] When the alkalinity in the detection result of the product is lower than the preset alkalinity threshold, the control system first controls to decrease the rotation speeds of the fifth helical blade and the sixth helical blade, and controls the decreasing speed of the rotation speed of the fifth helical blade to be lower than that of the sixth helical blade; when the alkalinity in the detection result is still lower than the preset alkalinity threshold after the preset time, the control system then controls to decrease the rotation speeds of the third helical blade and the fourth helical blade, and controls the decreasing speed of the rotation speed of the third helical blade to be lower than that of the fourth helical blade.

[0022] As a further preferred embodiment of the present invention, the central stirrer includes a stirring shaft and stirring blades. One end of the stirring shaft extends out of the hydrolysis reactor and is connected to the output shaft of an external power source, and the other end of the stirring shaft extends into the interior of the hydrolysis reactor and is connected to the stirring blades.

[0023] As a further preferred embodiment of the present invention, the circulating liquid flow regulator includes a circulation controller and a circulation spray port. The circulation spray port extends into the interior of the hydrolysis reactor from the top. One end of the circulation controller is connected to the circulation liquid outlet, the other end is connected to the circulation spray port, and the circulation controller is also signal-connected to the control system to perform corresponding control on the circulation spray port according to the instructions of the control system.

[0024] Furthermore, the present invention also provides a control method for an anaerobic hydrolysis system, characterized in that it comprises the following steps:

[0025] 1) Feeding kitchen waste, anaerobic digestion liquid and hydrolysis acidification bacteria into the hydrolysis reactor through a turbulent mixer;

[0026] 2) The central agitator fully stirs the mixture inside the hydrolysis reactor and separates the solid and liquid through the screen;

[0027] 3) The solid phase products of kitchen waste are discharged regularly through the solid residue outlet;

[0028] 4) The liquid phase hydrolyzate of the kitchen waste is circulated into the hydrolysis reactor through the circulating liquid flow device;

[0029] 5) After the COD and pH values ​​inside the hydrolysis reactor reach the preset values, automatic discharge is achieved through the carbon source outlet;

[0030] 6) The control system controls the hydrolysis reactor, turbulent mixer, central agitator and circulating liquid flow device accordingly according to the detection results of the products.

[0031] Compared with the prior art, the beneficial effects achieved by the present invention include:

[0032] 1) The present invention provides an anaerobic hydrolysis system and a control method thereof. Through the coordinated use of a turbulent mixer, a central agitator, and a circulating liquid flow device, the alkalinity, bacterial strain, and temperature required for hydrolysis can be provided according to demand. The turbulent mixer is used to achieve rapid mixing of kitchen waste and bacterial strains. Through feed diversion and liquid phase hydrolyzate circulation spraying, the leaching and hydrolysis of kitchen waste are accelerated, the phase change efficiency of the solid phase in the kitchen waste and the hydrolysis efficiency of the kitchen waste are improved, and the efficiency of kitchen waste hydrolyzate in preparing an organic composite carbon source for sewage treatment is improved. At the same time, through the reflux of anaerobic digestion liquid, the cost and energy loss of preparing an organic composite carbon source from kitchen waste are significantly reduced.

[0033] 2) The present invention provides an anaerobic hydrolysis system and a control method thereof. By correspondingly controlling each group of spiral sheets in the spiral sheet assembly, while achieving smooth feeding of kitchen waste, the turbulent mixer is given priority to correspondingly control the feeding amount of kitchen waste, anaerobic digestion liquid and hydrolysis acidifying bacteria to avoid the possible impact on the product caused by directly controlling the feeding amount of kitchen waste, anaerobic digestion liquid and hydrolysis acidifying bacteria. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the present invention.

[0035] Figure 2 An enlarged view of the structure of the turbulent mixer of the present invention. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] As Figure 1 shown, an anaerobic hydrolysis system provided in this embodiment includes a hydrolysis reactor 1, a turbulent mixer 2, a central agitator 3, a circulating liquid flow device 4 and a control system C. Among them,

[0039] The turbulent mixer 2 is arranged at the top of the hydrolysis reactor 1 and is internally connected to the hydrolysis reactor 1. Kitchen waste, anaerobic digestion liquid and hydrolytic acidification bacteria all enter the interior of the hydrolysis reactor 1 through the turbulent mixer 2.

[0040] The central agitator 3 is arranged at the inner top position of the hydrolysis reactor 1, and the central agitator 3 is connected to an external power source.

[0041] The circulating liquid flow device 4 is respectively arranged at the inlet end and the outlet end of the hydrolysis reactor 1.

[0042] The control system C is respectively signal-connected to the hydrolysis reactor 1, the turbulent mixer 2, the central agitator 3 and the circulating liquid flow device 4. The control system C respectively controls the hydrolysis reactor 1, the turbulent mixer 2, the central agitator 3 and the circulating liquid flow device 4 according to the detection results of the products.

[0043] As Figure 1 shown, the hydrolysis reactor 1 in this embodiment selects an anaerobic digestion tank, which includes an upper shell 11 and a lower shell 12 that are interconnected. A screen 5 is arranged at the internally connected position of the upper shell 11 and the lower shell 12. The screen 5 is used for solid-liquid separation of the fermentation liquid of kitchen waste. In this embodiment, the thickness of the screen is 5 mm, and the aperture of the screen is 0.8 - 1 mm. Through the continuous leaching of anaerobic digestion liquid and the acidification hydrolysis of hydrolytic acidification bacteria, the solid-phase hydrolysis of kitchen waste undergoes a phase change for solid-liquid separation through the screen hole plate. Large particle solids remain on the top of the screen 5, and the hydrolyzed liquid phase flows into the interior of the lower shell 12 through the screen 5.

[0044] In this embodiment, a backwash spray head is arranged at the lower end of the screen 5. The backwash spray head is connected to a booster pump through an electromagnetic valve. The electromagnetic valve and the booster pump are signal-connected to the control system C. After the hydrolysis is completed, the booster pump can be controlled by the control system C to start and the electromagnetic valve to close, and the booster pump outputs power to drive the backwash spray head to realize the reverse cleaning of the screen 5.

[0045] Preferably, the upper housing 11 in this embodiment is set to be cylindrical, and a solid residue outlet 111 is provided at the outer bottom of the upper housing 11; the lower housing 12 is set to be conical, a circulating liquid outlet 121 is provided at the outer bottom of the lower housing 12, and a carbon source outlet 122 is provided at the bottom end of the lower housing 12. After solid-liquid separation, lignin, cellulose, etc. that are not easily hydrolyzed are regularly discharged through the solid residue outlet 111 and then enter the anaerobic digestion system to further generate biogas. The anaerobic digestion liquid that enters the interior of the lower housing 12 through the sieve 5 can enter the circulating liquid flow device 4 through the circulating liquid outlet 121 for recycling. The hydrolysis reactor 1 is equipped with a COD on-line detector and a pH detector to realize the on-line detection of the COD of the organic composite carbon source and the real-time detection of the pH of the mixed liquid. When the COD and pH values in the hydrolysis reactor 1 reach the preset values, automatic discharging can be realized under the drive of the discharging pump through the carbon source outlet.

[0046] In this embodiment, the reaction temperature in the hydrolysis reactor 1 is controlled at 55 ± 1 °C, the pH is controlled at 5.0 - 6.0, the organic load is controlled at 15 - 20 kg TVS / (m³•d), the hydraulic retention time (HRT) is controlled at 2 - 3 d, and the yield of VFA after hydrolysis is 0.30 - 0.35 kg CODVFA / kg CODfed.

[0047] Preferably, a liquid level gauge and a temperature sensor are also equipped inside the hydrolysis reactor 1 to realize the real-time detection of the liquid level and temperature of the hydrolysis reaction mixed liquid.

[0048] As Figure 1-2 shown, in this embodiment, the turbulent mixer 2 includes a mixing housing 21, and a plurality of groups of spiral blades 22 are arranged inside the mixing housing. A food waste inlet 23 is provided at the outer end of the mixing housing 21, an anaerobic digestion liquid inlet 24 and a hydrolyzed acidifying bacteria supplement port 25 are respectively provided at the top of the mixing housing 21. The plurality of groups of spiral blades 22 facilitate the delivery of food waste, anaerobic digestion liquid, and hydrolyzed acidifying bacteria to the inside of the hydrolysis reactor 1 through spiral cutting and rotary transportation. An inlet diversion port 26 extending along the inner wall of the hydrolysis reactor 1 is also provided inside the connection position between the mixing housing 21 and the hydrolysis reactor 1. After the food waste, anaerobic digestion liquid, and hydrolyzed acidifying bacteria are mixed inside the turbulent mixer 2, they can enter the inside of the hydrolysis reactor 1 through the inlet diversion port 26.

[0049] As Figure 2As shown in the figure, the spiral group piece 22 in this embodiment includes six groups of spiral pieces, namely, the first spiral piece 221, the second spiral piece 222, the third spiral piece 223, the fourth spiral piece 224, the fifth spiral piece 225, and the sixth spiral piece 226, which are connected end to end in sequence. And from the direction away from the hydrolysis reactor 1 to the direction close to the hydrolysis reactor 1, the first spiral piece 221, the second spiral piece 222, the third spiral piece 223, the fourth spiral piece 224, the fifth spiral piece 225, and the sixth spiral piece 226 are arranged in sequence. The kitchen waste feed port 23 is arranged outside the first spiral piece 221, and the anaerobic digestion liquid feed port 24 is arranged on the top of the first spiral piece 221. The first spiral piece 221 and the second spiral piece 222 are used to spiral the kitchen waste and the anaerobic digestion liquid into the interior of the hydrolysis reactor 1. The hydrolysis acidification bacteria supplement port 25 is arranged on the top of the third spiral piece 223. The third spiral piece 223 and the fourth spiral piece 224 are used to spiral the hydrolysis acidification bacteria and the front-end kitchen waste and anaerobic digestion liquid into the interior of the hydrolysis reactor 1. And the fifth spiral piece 225 and the sixth spiral piece 226 are used to mix the kitchen waste, the anaerobic digestion liquid, and the hydrolysis acidification bacteria sent by the front-side spiral pieces, and spiral their mixture into the interior of the hydrolysis reactor 1.

[0050] In this embodiment, the length of the turbulent mixer 2 is set to 1 - 2 m, and the proportion of the anaerobic digestion liquid sent into the interior of the hydrolysis reactor 1 via the turbulent mixer 2 accounts for 50% - 70% of the mass of the kitchen waste.

[0051] The control system can perform corresponding control on the six groups of spiral pieces respectively, specifically as follows:

[0052] When the concentration in the detection result of the product is higher than the preset concentration threshold, the control system first controls to increase the rotation speeds of the fifth spiral piece 225 and the sixth spiral piece 226 to send the remaining anaerobic digestion liquid and hydrolysis acidification bacteria in the turbulent mixer 2 into the hydrolysis reactor 1 as soon as possible to promote the hydrolysis reaction, and controls the rotation speed increase rate of the fifth spiral piece 225 to be higher than that of the sixth spiral piece 226 to maintain a higher rotation speed of the fifth spiral piece 225 for the spiral transportation of the still incompletely refined kitchen waste transported from the front end; when the concentration in the detection result is still higher than the preset concentration threshold after the preset time, at this time, it is necessary to supplement the anaerobic digestion liquid into the interior of the hydrolysis reactor 1, and the control system then controls to increase the rotation speeds of the first spiral piece 221 and the second spiral piece 222 to facilitate the feeding of the anaerobic digestion liquid into the interior of the hydrolysis reactor 1, and controls the rotation speed increase rate of the first spiral piece 221 to be lower than that of the second spiral piece 222. Since only the anaerobic digestion liquid is added at this time and the feeding amount of the kitchen waste is increased as little as possible, the rotation speed increase rate of the first spiral piece 221 needs to be lower than that of the second spiral piece 222;

[0053] When the concentration in the detection result of the product is lower than the preset concentration threshold, the control system first controls to reduce the rotation speeds of the fifth spiral blade 225 and the sixth spiral blade 226, so as to reduce the speed at which the residual anaerobic digestion liquid and hydrolyzed acidifying bacteria in the turbulent mixer 2 are sent into the hydrolysis reactor 1, thereby slowing down the hydrolysis reaction, and controls the deceleration of the rotation speed of the fifth spiral blade 225 to be lower than the deceleration of the rotation speed of the sixth spiral blade 226, so as to maintain a relatively high rotation speed of the fifth spiral blade 225 for the spiral conveyance of the still incompletely refined food waste conveyed from the front end; when the concentration in the detection result is still lower than the preset concentration threshold after the preset time, the control system then controls to reduce the rotation speeds of the first spiral blade 221 and the second spiral blade 222, and controls the deceleration of the rotation speed of the first spiral blade 221 to be lower than the deceleration of the rotation speed of the second spiral blade 222; at this time, it is not necessary to increase the anaerobic digestion liquid supplement, so the first spiral blade 221 and the second spiral blade 222 are only used to convey food waste, so the acceleration of the rotation speed of the first spiral blade 221 needs to be lower than the acceleration of the rotation speed of the second spiral blade 222 to maintain a relatively high rotation speed of the first spiral blade 221 to achieve the spiral feeding of food waste;

[0054] When the alkalinity in the detection result of the product is higher than the preset alkalinity threshold, the control system first controls to increase the rotation speeds of the fifth spiral blade 225 and the sixth spiral blade 226, so as to send the residual anaerobic digestion liquid and hydrolyzed acidifying bacteria in the turbulent mixer 2 into the hydrolysis reactor 1 as soon as possible to promote the hydrolysis reaction, and controls the acceleration of the rotation speed of the fifth spiral blade 225 to be higher than the acceleration of the rotation speed of the sixth spiral blade 226, so as to maintain a relatively high rotation speed of the fifth spiral blade 225 for the spiral conveyance of the still incompletely refined food waste conveyed from the front end; when the alkalinity in the detection result is still higher than the preset alkalinity threshold after the preset time, at this time, it is necessary to supplement hydrolyzed acidifying bacteria into the hydrolysis reactor 1, and the control system then controls to increase the rotation speeds of the third spiral blade 223 and the fourth spiral blade 224, and controls the acceleration of the rotation speed of the third spiral blade 223 to be higher than the acceleration of the rotation speed of the fourth spiral blade 224, so as to facilitate the spiral conveyance of the hydrolyzed acidifying bacteria fed from the top position of the third spiral blade 223;

[0055] When the alkalinity in the detection result of the product is lower than the preset alkalinity threshold, the control system first controls to reduce the rotation speeds of the fifth spiral blade 225 and the sixth spiral blade 226, so as to reduce the speed at which the anaerobic digestion liquid remaining inside the turbulent mixer 2 and the hydrolyzed acidifying bacteria are sent into the hydrolysis reactor 1, thereby slowing down the hydrolysis reaction, and controls the deceleration of the rotation speed of the fifth spiral blade 225 to be lower than the deceleration of the rotation speed of the sixth spiral blade 226; when the alkalinity in the detection result is still lower than the preset alkalinity threshold after a preset time, the control system then controls to reduce the rotation speeds of the third spiral blade 223 and the fourth spiral blade 224. At this time, it is not necessary to increase the input of hydrolyzed acidifying bacteria. Therefore, the third spiral blade 223 and the fourth spiral blade 224 are only used to send in food waste. Therefore, it is necessary to control the deceleration of the rotation speed of the third spiral blade 223 to be lower than the deceleration of the rotation speed of the fourth spiral blade 224 to maintain a relatively high rotation speed of the third spiral blade 223 to achieve the spiral feeding of food waste.

[0056] As Figure 1 shown, the central stirrer 3 in this embodiment includes a stirring shaft 31 and stirring blades 32. One end of the stirring shaft 31 extends out of the hydrolysis reactor 1 and is connected to the output shaft of an external power source 30. The other end of the stirring shaft 31 extends into the interior of the hydrolysis reactor 1 and is connected to the stirring blades 32. The external power source 30 is preferably a driving motor. The output shaft of the driving motor outputs power to drive the stirring shaft 31 to drive the stirring blades 32 thereon to rotate synchronously, thereby realizing the stirring of the mixed liquid inside the hydrolysis reactor 1. The control system C can control and adjust the output power of the external power source 30 according to the detection result of the product to realize the corresponding adjustment of the stirring speed.

[0057] As Figure 1 shown, in this embodiment, the circulating liquid flow device 4 includes a circulation controller C1 and a circulation spray port. The circulation spray port extends into the interior of the hydrolysis reactor 1 from the top. One end of the circulation controller C1 is connected to the circulation liquid outlet 121, and the other end is connected to the circulation spray port, so as to send the anaerobic digestion liquid in the hydrolysis reactor 1 to the circulation spray port through the circulation liquid outlet 121, and then spray it into the interior of the hydrolysis reactor 1 through the circulation spray port.

[0058] The circulation controller C1 in this embodiment is also connected to the control system C in signal to perform corresponding control on the circulation spray port according to the instruction of the control system C. The control modes that the circulation controller C1 can perform corresponding control on the circulation spray port according to the instruction of the control system C at least include: start-stop adjustment of the circulation spray port, angle adjustment of the circulation spray port, flow rate and flow velocity adjustment of the circulation spray port, spray range adjustment of the circulation spray port, etc.

[0059] As a further preference of this embodiment, in this embodiment, the circulation ratio of the digestion liquid is controlled between 0.5 and 0.7.

[0060] The parameters of the circulating spray nozzles can be adjusted correspondingly according to the detection results of the hydrolysis reaction products. For example:

[0061] When the concentration in the detection result of the product is higher than the preset concentration threshold, the control system C issues corresponding control instructions to the circulation controller C1 to control the increase of the spray flow rate of the circulating spray nozzles, or control the increase of the spray range of the circulating spray nozzles, or control the increase of the spray angle of the circulating spray nozzles; thereby fully promoting the recycling of the anaerobic digestion liquid and appropriately reducing the concentration in the detection result of the product in a way that promotes the hydrolysis reaction;

[0062] When the concentration in the detection result of the product is lower than the preset concentration threshold, the control system C issues corresponding control instructions to the circulation controller C1 to control the reduction of the spray flow rate of the circulating spray nozzles, or control the reduction of the spray range of the circulating spray nozzles, or control the reduction of the spray angle of the circulating spray nozzles; thereby appropriately reducing the recycling of the anaerobic digestion liquid and appropriately increasing the concentration in the detection result of the product in a way that slowly proceeds the hydrolysis reaction;

[0063] And in this embodiment, the priority settings of each adjustment method are: spray flow rate adjustment > spray range adjustment > spray angle adjustment;

[0064] Since the spray flow rate adjustment method has a small operation action on the circulating spray nozzles and a rapid feedback, the priority of the spray flow rate adjustment is set to the highest; and since the spray angle adjustment method has a large action on the one hand and there is a possibility of collision damage with the kitchen waste newly entering the interior of the hydrolysis reactor 1, the priority of the spray flow rate adjustment is set to the lowest, while the adjustment priority of the spray range adjustment is between the two.

[0065] [Second Embodiment]

[0066] The present invention also provides a second embodiment, which provides a control method for an anaerobic hydrolysis system, including the following steps:

[0067] 1) Feed the kitchen waste, anaerobic digestion liquid and hydrolyzed acidification bacteria into the interior of the hydrolysis reactor through a turbulent mixer;

[0068] 2) The central stirrer fully stirs the mixture inside the hydrolysis reactor and realizes solid-liquid separation through a sieve;

[0069] 3) The solid-phase product of the kitchen waste is regularly discharged through the solid residue outlet;

[0070] 4) The liquid-phase hydrolysis solution of the kitchen waste is circulated into the interior of the hydrolysis reactor through a circulating liquid flow device;

[0071] 5) After the COD and pH value inside the hydrolysis reactor reach the preset values, automatic discharging is realized through the carbon source outlet;

[0072] 6) The control system controls the hydrolysis reactor, the turbulent mixer, the central stirrer and the circulating liquid flow device respectively according to the detection results of the products.

[0073] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An anaerobic hydrolysis system, characterized in that: it includes a hydrolysis reactor (1), a turbulent mixer (2), a central agitator (3), a circulating liquid flow device (4) and a control system (C). Among them, the turbulent mixer (2) is arranged at the top of the hydrolysis reactor (1) and is internally connected to the hydrolysis reactor (1). Food waste, anaerobic digestion liquid and hydrolyzed acidifying bacteria all enter the interior of the hydrolysis reactor (1) through the turbulent mixer (2); the central agitator (3) is arranged at the inner top position of the hydrolysis reactor (1), and the central agitator (3) is connected to an external power source; the circulating liquid flow device (4) includes a circulation controller (C1) and a circulating spray port. The circulating spray port is arranged at the inlet end of the hydrolysis reactor (1), and the circulating spray port extends into the interior of the hydrolysis reactor (1) from the top. A circulating liquid outlet (121) is arranged at the outlet end of the hydrolysis reactor (1). One end of the circulation controller (C1) is connected to the circulating liquid outlet (121), and the other end is connected to the circulating spray port. The circulation controller (C1) is in signal connection with the control system (C) to perform corresponding control on the circulating spray port according to the instructions of the control system (C); the control system (C) is in signal connection with the hydrolysis reactor (1), the turbulent mixer (2), the central agitator (3) and the circulating liquid flow device (4) respectively. The control system (C) performs corresponding control on the hydrolysis reactor (1), the turbulent mixer (2), the central agitator (3) and the circulating liquid flow device (4) respectively according to the detection results of the products; the hydrolysis reactor (1) includes an upper shell (11) and a lower shell (12) that are interconnected. A screen (5) is arranged at the internally connected position of the upper shell (11) and the lower shell (12). A backwash spray head is arranged at the lower end of the screen (5). The backwash spray head is connected to a booster pump through an electromagnetic valve. The electromagnetic valve and the booster pump are in signal connection with the control system (C). After hydrolysis is completed, the booster pump is started and the electromagnetic valve is closed through the control of the control system. The booster pump outputs power to drive the backwash spray head to realize the reverse cleaning of the screen; the turbulent mixer (2) includes a mixing shell (21). A plurality of groups of spiral blade groups (22) are arranged inside the mixing shell. A food waste feed port (23) is opened at the outer end of the mixing shell (21). An anaerobic digestion liquid feed port (24) and a hydrolyzed acidifying bacteria supplement port (25) are respectively opened at the top of the mixing shell (21). A feed diversion port (26) extending along the inner wall of the hydrolysis reactor (1) is also arranged inside the connection position between the mixing shell (21) and the hydrolysis reactor (1); The spiral blade group (22) includes six groups of spiral blades, namely, a first spiral blade (221), a second spiral blade (222), a third spiral blade (223), a fourth spiral blade (224), a fifth spiral blade (225), and a sixth spiral blade (226), which are connected in sequence from head to tail. And in the direction from far away from the hydrolysis reactor (1) to close to the hydrolysis reactor (1), the first spiral blade (221), the second spiral blade (222), the third spiral blade (223), the fourth spiral blade (224), the fifth spiral blade (225), and the sixth spiral blade (226) are arranged in sequence. The kitchen waste feed port (23) is arranged outside the first spiral blade (221), the anaerobic digestion liquid feed port (24) is arranged at the top of the first spiral blade (221), the hydrolysis acidification bacteria supplement port (25) is arranged at the top of the third spiral blade (223), and the control system can respectively control the six groups of spiral blades correspondingly; When the concentration in the detection result of the product is higher than the preset concentration threshold, the control system first controls to increase the rotation speeds of the fifth spiral blade (225) and the sixth spiral blade (226), and controls the rotation speed increase of the fifth spiral blade (225) to be higher than that of the sixth spiral blade (226); when the concentration in the detection result is still higher than the preset concentration threshold after the preset time, the control system then controls to increase the rotation speeds of the first spiral blade (221) and the second spiral blade (222), and controls the rotation speed increase of the first spiral blade (221) to be lower than that of the second spiral blade (222); When the concentration in the detection result of the product is lower than the preset concentration threshold, the control system first controls to decrease the rotation speeds of the fifth spiral blade (225) and the sixth spiral blade (226), and controls the rotation speed decrease of the fifth spiral blade (225) to be lower than that of the sixth spiral blade (226); when the concentration in the detection result is still lower than the preset concentration threshold after the preset time, the control system then controls to decrease the rotation speeds of the first spiral blade (221) and the second spiral blade (222), and controls the rotation speed decrease of the first spiral blade (221) to be lower than that of the second spiral blade (222); When the alkalinity in the detection result of the product is higher than the preset alkalinity threshold, the control system first controls to increase the rotation speeds of the fifth spiral blade (225) and the sixth spiral blade (226), and controls the rotation speed increase of the fifth spiral blade (225) to be higher than that of the sixth spiral blade (226); when the alkalinity in the detection result is still higher than the preset alkalinity threshold after the preset time, the control system then controls to increase the rotation speeds of the third spiral blade (223) and the fourth spiral blade (224), and controls the rotation speed increase of the third spiral blade (223) to be higher than that of the fourth spiral blade (224); When the alkalinity in the detection result of the product is lower than the preset alkalinity threshold, the control system first controls to reduce the rotation speeds of the fifth helical blade (225) and the sixth helical blade (226), and controls the rotation speed of the fifth helical blade (225) to decelerate lower than the deceleration of the rotation speed of the sixth helical blade (226); when after the preset time the alkalinity in the detection result is still lower than the preset alkalinity threshold, the control system then controls to reduce the rotation speeds of the third helical blade (223) and the fourth helical blade (224), and controls the rotation speed of the third helical blade (223) to decelerate lower than the deceleration of the rotation speed of the fourth helical blade (224); The central stirrer (3) includes a stirring shaft (31) and stirring blades (32). One end of the stirring shaft (31) extends out of the hydrolysis reactor (1) and is connected to the output shaft of an external power source (30), and the other end of the stirring shaft (31) extends into the interior of the hydrolysis reactor (1) and is connected to the stirring blades (32). The control system can control and adjust the output power of the external power source according to the detection result of the product to achieve corresponding adjustment of the stirring speed; The control modes that the circulation controller can perform corresponding control on the circulation spray nozzles according to the instructions of the control system include: one or a combination of more of starting and stopping adjustment of the circulation spray nozzles, angle adjustment of the circulation spray nozzles, flow rate and flow velocity adjustment of the circulation spray nozzles, and spray range adjustment of the circulation spray nozzles; When the concentration in the detection result of the product is higher than the preset concentration threshold, the control system issues corresponding control instructions to the circulation controller to control to increase the spray flow rate of the circulation spray nozzles or control to increase the spray range of the circulation spray nozzles or control to increase the spray angle of the circulation spray nozzles; When the concentration in the detection result of the product is lower than the preset concentration threshold, the control system issues corresponding control instructions to the circulation controller to control to reduce the spray flow rate of the circulation spray nozzles or control to reduce the spray range of the circulation spray nozzles or control to reduce the spray angle of the circulation spray nozzles.

2. An anaerobic hydrolysis system according to claim 1, characterized in that: The upper housing (11) is provided as a cylinder, and a solid residue outlet (111) is provided at the outer bottom of the upper housing (11).

3. An anaerobic hydrolysis system according to claim 1, characterized in that: The lower housing (12) is provided as a cone, a circulating liquid outlet (121) is provided at the outer bottom of the lower housing (12), and a carbon source outlet (122) is provided at the bottom end of the lower housing (12).

4. A control method for an anaerobic hydrolysis system according to any one of claims 1-3, characterized in that: It includes the following steps: 1) Feed kitchen waste, anaerobic digestion liquid and hydrolysis acidification bacteria into the interior of the hydrolysis reactor through a turbulent mixer; 2) The central stirrer fully stirs the mixture inside the hydrolysis reactor and realizes solid-liquid separation through a sieve; 3) Regularly discharge the solid-phase product of the kitchen waste through the solid residue outlet; 4) The liquid-phase hydrolysis liquid of the kitchen waste is circulated into the interior of the hydrolysis reactor through a circulating liquid flow device; 5) After the COD and pH value inside the hydrolysis reactor reach the preset values, automatically discharge through the carbon source outlet. 6) The control system controls the hydrolysis reactor, the turbulent mixer, the central agitator and the circulating liquid flow device respectively according to the detection results of the product.

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