CN210030377U - Sludge and kitchen waste co-processing system - Google Patents
Sludge and kitchen waste co-processing system Download PDFInfo
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- CN210030377U CN210030377U CN201920559007.5U CN201920559007U CN210030377U CN 210030377 U CN210030377 U CN 210030377U CN 201920559007 U CN201920559007 U CN 201920559007U CN 210030377 U CN210030377 U CN 210030377U
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Abstract
The utility model discloses a kitchen garbage processing apparatus especially relates to a kitchen garbage and sludge coprocessing's anaerobic digestion system. The utility model provides a mud and kitchen garbage coprocessing system, includes that mud receives to fight and kitchen garbage receives to fight and broken feeder, kitchen garbage receives to fight and broken feeder and communicates in proper order and has living beings separator and screw pressure hydroextractor, the screw pressure hydroextractor has wet-type anaerobic reactor through setting up the liquid phase discharge gate intercommunication on the screw pressure hydroextractor, wet-type anaerobic reactor still communicates and has mud to receive to fight. The utility model provides a some problems that exist when present mud and kitchen garbage are handled alone, improve anaerobic reactor's stability and produce gas efficiency to improve the agricultural security of natural pond sediment behind the kitchen garbage anaerobic digestion.
Description
Technical Field
The utility model relates to a kitchen garbage and sludge treatment field especially relate to a kitchen garbage and sludge coprocessing's anaerobic digestion system.
Background
The anaerobic digestion technology can realize the reduction, stabilization and harmlessness (inactivation of pathogenic microorganisms and worm eggs) of the kitchen waste and the sludge and recover clean energy (methane), and is an environment-friendly organic waste treatment technology.
The sludge is a product of urban sewage treatment, the organic matter content of the sludge in China is low, and the sludge is subjected to anaerobic digestion independently, so that the defect of low gas production efficiency exists.
The kitchen waste is high in organic matter content, easy to decompose and high in methane production potential, but acid accumulation is easy to occur when the feeding load is high. The carbon-nitrogen ratio (C/N) of the kitchen waste in part of regions is low, so that the ammonia nitrogen content is continuously increased, and the activity of anaerobic microorganisms is further inhibited. The high oil content and high salt content of the kitchen waste also have adverse effects on anaerobic microorganisms. At present, anaerobic digestion of kitchen waste generally needs to remove oil in a pretreatment stage, and the process is complex. In addition, wet anaerobic digestion of the kitchen waste is easy to generate scum, and the scum occupies the effective volume of the reactor, blocks the pipeline and blocks the escape of methane.
Sludge and kitchen waste are two major sources of urban organic waste, and the sludge and kitchen waste are mixed for anaerobic digestion in the prior art, so that the purposes of balancing nutrient substances, diluting harmful substances and improving the buffer capacity of a digestion solution are achieved, but the content of heavy metal in biogas residues generated by anaerobic digestion of the sludge-mixed material is easy to exceed the standard, and the risk of land pollution exists in agriculture.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a be not enough to prior art, the utility model aims to provide a processing system of mud and kitchen garbage to solve some problems that exist when present mud and kitchen garbage are handled alone, improve anaerobic reactor's stability and produce gas efficiency, and improve the agricultural security of natural pond sediment behind the kitchen garbage anaerobic digestion.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a mud and kitchen garbage coprocessing system, includes that mud receives to fight and kitchen garbage receives to fight and broken feeder, kitchen garbage receives to fight and broken feeder and communicates in proper order and has living beings separator and screw pressure hydroextractor, the screw pressure hydroextractor has wet-type anaerobic reactor through setting up the liquid phase discharge gate intercommunication on the screw pressure hydroextractor, wet-type anaerobic reactor still communicates and has mud to receive to fight.
Preferably, the wet-type anaerobic reactor is provided with a biogas outlet a and a biogas slurry discharge port, the wet-type anaerobic reactor is communicated with solid-liquid separation equipment through the biogas slurry discharge port, and the solid-liquid separation equipment is provided with a filtrate discharge port a and a mud cake discharge port.
Preferably, the screw press dehydrator is also provided with a slag phase discharge port, the screw press dehydrator is communicated with a feeding buffer tank and a dry fermentation type anaerobic reactor through a slag phase discharge port in sequence through a slag phase pipe, a feeding pump is arranged on the slag phase pipe between the feeding buffer tank and the dry fermentation type anaerobic reactor, and the dry fermentation type anaerobic reactor is also communicated with the feeding buffer tank through a backflow biogas residue pipe.
Preferably, the dry fermentation type anaerobic reactor is provided with a biogas gas outlet b and a biogas residue discharge hole, the biogas residue discharge hole is communicated with a drying bed, and the drying bed is provided with a filtrate discharge hole b and a dry biogas residue discharge hole.
Preferably, a circulating pipe is further arranged on a slag phase pipe between the feeding buffer tank and the dry fermentation type anaerobic reactor, and the other end of the circulating pipe is communicated with the feeding buffer tank.
Preferably, the kitchen waste receiving hopper and the crushing and feeding device are also communicated with a magnetic separation device.
The utility model has the advantages of but not limited to:
compared with the prior art, the utility model discloses a mud and kitchen garbage coprocessing system has saved the deoiling process in the anaerobic digestion preliminary treatment of general kitchen garbage, and the mixed anaerobic digestion is carried out to liquid phase (grease-containing waste water) that some grease produced along with kitchen garbage spiral shell pressure and mud, and the stability of grease anaerobic digestion can be improved to mud higher basicity, abundant microelement and the structural feature that can adsorb grease; the grease has higher gas production performance and high conversion efficiency, and the volume gas production rate of the reactor can be obviously improved by mixing and digesting; meanwhile, the sludge is diluted, and the resistance of hydraulic circulating stirring of the wet anaerobic reactor is reduced.
The anaerobic digestion of the mixture of the sludge and the grease can improve the dehydration performance of the digested sludge and reduce the production of mud cakes.
The kitchen waste screw-pressing dehydration process leads a part of grease to be taken away by the liquid phase, the content of the grease in the slag phase is reduced, and the risk of volatile acid accumulation in the anaerobic digestion process of the slag phase is reduced.
The kitchen waste screw-pressing dehydration process leads most of salt to be taken away from the liquid phase, reduces the salt content in the slag phase, lightens the inhibiting effect of high salt content on anaerobic microorganisms, and can reduce the risk of soil salt accumulation when the biogas residues are used as organic fertilizers; the slag phase is independently subjected to dry fermentation, so that the mixing with sludge with heavy metal pollution risk is avoided, and the agricultural safety of the biogas residue after the fermentation of the kitchen waste slag phase is higher.
The kitchen waste is separated into a liquid phase and a residue phase to be subjected to wet fermentation and dry fermentation respectively, the residue phase dry fermentation can obtain higher volume gas production rate, the heating energy consumption is saved, and the scum problem of wet anaerobic digestion does not exist; the biogas residue generated by residue dry fermentation is naturally dried in a drying field, so that the energy consumption of a mechanical dehydration process is saved.
The feeding buffer tank has the function of stirring and inoculating, and meanwhile, stirring equipment is not required to be additionally arranged in the dry fermentation type anaerobic reactor, so that the occupied area and the equipment investment are saved.
Drawings
FIG. 1 is a schematic structural view of a sludge and kitchen waste co-processing system according to an embodiment of the present invention;
in the figure: 1-a kitchen waste receiving hopper and a crushing and feeding device; 2-magnetic separation equipment; 3-a biomass separator; 4-screw pressing dehydrator; 5-a wet anaerobic reactor; 6-sludge receiving hopper; 7-solid-liquid separation equipment; 8-a dry fermentation anaerobic reactor; 9-drying bed; 10-a circulation pipe; 11-a feed pump; 12-refluxing the biogas residue pipe; 13-a feed buffer tank; 14-slag phase tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further explained with reference to the following embodiments, but the present invention is not limited to the scope of the present invention.
Example 1
This embodiment is shown in fig. 1, a mud and kitchen garbage coprocessing system, receive fighting and broken feeder 1 including mud and receive fighting 6 and kitchen garbage, kitchen garbage receives fighting and broken feeder 1 and communicates in proper order has biomass separator 3 and screw-pressing hydroextractor 4, screw-pressing hydroextractor 4 has wet-type anaerobic reactor 5 through setting up the liquid phase discharge gate intercommunication on screw-pressing hydroextractor 4, wet-type anaerobic reactor 5 still communicates and has the mud to receive fighting 6.
In the using process, the kitchen waste is removed of solid impurities through the biomass separator 3 and then is sent into the screw press dehydrator 4 in the form of slurry, the screw press dehydrator 4 separates the slurry into a liquid phase and a slag phase, and the liquid phase enters the wet anaerobic reactor 5 and then is mixed and reacted with sludge entering the wet anaerobic reactor 5 through the sludge receiving hopper 6.
The mode omits an oil removal process in the anaerobic digestion pretreatment of common kitchen waste, part of grease is subjected to mixed anaerobic digestion along with liquid phase (grease-containing wastewater) generated by the screw pressing of the kitchen waste and sludge, and the sludge has higher alkalinity, abundant trace elements and structural characteristics capable of adsorbing the grease, so that the stability of the anaerobic digestion of the grease can be improved; the grease has higher gas production performance and high conversion efficiency, and the volume gas production rate of the reactor can be obviously improved by mixing and digesting; simultaneously, the sludge is diluted, and the resistance of hydraulic circulating stirring of the wet anaerobic reactor 5 is reduced.
The anaerobic digestion of the mixture of the sludge and the grease can improve the dehydration performance of the digested sludge and reduce the production of mud cakes.
Example 2
In this embodiment, a further improvement is made based on embodiment 1, as shown in fig. 1, the wet anaerobic reactor 5 is provided with a biogas outlet a and a biogas slurry outlet, the wet anaerobic reactor 5 is communicated with a solid-liquid separation device 7 through the biogas slurry outlet, and the solid-liquid separation device 7 is provided with a filtrate outlet a and a mud cake outlet.
Example 3
This embodiment is further improved based on any one of embodiments 1 to 2, and as shown in fig. 1, the screw press dehydrator 4 is further provided with a slag phase discharge port, the screw press dehydrator 4 is communicated with a feed buffer tank 13 and a dry fermentation type anaerobic reactor 8 through the slag phase discharge port in sequence through a slag phase pipe 14, a feed pump 11 is provided on the slag phase pipe 14 between the feed buffer tank 13 and the dry fermentation type anaerobic reactor 8, and the dry fermentation type anaerobic reactor 8 is further communicated with the feed buffer tank 13 through a return biogas residue pipe 12.
In the using process, the slag phase obtained after the treatment of the screw press dehydrator 4 is inoculated and stirred by the feeding buffer tank 13 and then enters the dry fermentation type anaerobic reactor 8 for reaction.
In the mode, the screw pressing dehydration process of the kitchen waste enables a part of grease to be taken away from a liquid phase, the content of the grease in a slag phase is reduced, and the risk of volatile acid accumulation in the anaerobic digestion process of the slag phase is reduced.
The kitchen waste screw-pressing dehydration process leads most of salt to be taken away from the liquid phase, reduces the salt content in the slag phase, lightens the inhibiting effect of high salt content on anaerobic microorganisms, and can reduce the risk of soil salt accumulation when the biogas residues are used as organic fertilizers; the slag phase is independently subjected to dry fermentation, so that the mixing with sludge with heavy metal pollution risk is avoided, and the agricultural safety of the biogas residue after the fermentation of the kitchen waste slag phase is higher.
The kitchen waste is separated into a liquid phase and a residue phase to be subjected to wet fermentation and dry fermentation respectively, the residue phase dry fermentation can obtain higher volume gas production rate, the heating energy consumption is saved, and the scum problem of wet anaerobic digestion does not exist.
Biogas residues in the dry fermentation type anaerobic reactor 8 flow back to the feeding buffer tank 13, so that fermentation raw materials are fully inoculated, and meanwhile, stirring equipment is not required to be additionally arranged on the dry fermentation type anaerobic reactor 8, so that the land occupation and the equipment investment are saved.
Example 4
In this embodiment, a further improvement is made based on embodiment 3, as shown in fig. 1, the dry fermentation type anaerobic reactor 8 is provided with a biogas outlet b and a biogas residue outlet, the biogas residue outlet is communicated with a drying bed 9, and the drying bed 9 is provided with a filtrate outlet b and a dry biogas residue outlet.
In the using process, the biogas residues generated by residue dry fermentation are naturally dried in the drying field 9, so that the energy consumption of the mechanical dehydration process is saved.
Example 5
This embodiment is further improved based on embodiment 3, as shown in fig. 1, a circulation pipe 10 is further provided on a slag phase pipe 14 between the feed buffer tank 13 and the dry fermentation type anaerobic reactor 8, and the other end of the circulation pipe 10 is communicated with the feed buffer tank 13.
During use, the feed buffer tank 13 is provided with a stirring function by the circulation pipe 10.
Example 6
In this embodiment, which is further improved based on any one of embodiments 1 to 5, as shown in fig. 1, the kitchen waste receiving hopper and crushing and feeding device 1 is further communicated with a magnetic separation device 2.
In the using process, the magnetic separation equipment 2 is used for separating iron metal impurities in the kitchen waste and recycling the iron metal impurities as resources.
It is noted that the solid-liquid separation equipment 7 is one or a combination of a plate-and-frame filter press, a screw press dehydrator 4 or a centrifugal dehydrator.
It is to be noted that the wet anaerobic reactor 5 and the dry fermentation anaerobic reactor 8 have a steam or hot water heating device.
Notably, the feed pump 11 is one of a screw pump, a rotor pump, or a peristaltic pump.
It is noted that the wet anaerobic reactor 5 has a hydraulic circulation stirring device.
The following is a full description of the steps of the present patent:
the method comprises the following steps:
the magnetic separation equipment 2 is used for separating iron metal impurities in the kitchen waste, and the crushing feeding device is used for crushing the kitchen waste after the iron metal impurities are separated; the biomass separator 3 is used for separating solid impurities such as glass, bones and plastics in the crushed kitchen waste, and the particle size of the generated slurry is below 8 mm; the connection between the crushing and feeding device and the biomass separator 3 and the conveying of the solid impurities adopt a screw conveyer.
The screw press dehydrator 4 is used for squeezing the kitchen slurry output by the biomass separator 3, and a discharge liquid phase of the screw press dehydrator 4 is conveyed to the wet anaerobic reactor 5 through a centrifugal pump.
The sludge receiving hopper 6 receives dewatered sludge cakes from a municipal sewage treatment plant, and the sludge is conveyed to the wet anaerobic reactor 5 through a screw pump; the wet anaerobic reactor 5 is provided with a steam heating device, the temperature of materials is kept at 35 +/-1 ℃ or 55 +/-1 ℃, hydraulic circulating stirring is carried out through a centrifugal pump, biogas is generated through anaerobic digestion, the digested biogas slurry is centrifuged through a centrifugal dehydrator, the generated mud cakes are transported out for landfill or incineration disposal, and the filtrate enters a sewage treatment unit for further treatment.
Step two:
the discharge slag phase part of the screw press dehydrator 4 is conveyed to a feeding buffer tank 13 through a screw pump, and is mixed with biogas residues from a dry fermentation type anaerobic reactor 8 according to the mass ratio of Volatile Solids (VS) of 1:4, and the feeding pump 11 has the function of circularly stirring the mixture in the feeding buffer tank 13, so that the fermentation raw materials are fully inoculated; the feeding pump 11 is one of a screw pump, a rotor pump or a peristaltic pump.
The inoculated materials are conveyed to a dry fermentation type anaerobic reactor 8 through a feed pump 11, the dry fermentation type anaerobic reactor 8 is provided with a steam heating device, the temperature of the materials is kept at 35 +/-1 ℃ or 55 +/-1 ℃, biogas is generated through anaerobic digestion, one part of digested biogas residues is used for inoculation of fermentation raw materials, the other part of the digested biogas residues is conveyed to a biogas residue drying field 9, the dry biogas residues can be used as organic fertilizer raw materials, and the filtrate enters a sewage treatment unit for further treatment.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a mud and kitchen garbage coprocessing system, receives fill and broken feeder (1) including mud receiving hopper (6) and kitchen garbage, its characterized in that: kitchen garbage receives fill and broken feeder (1) and communicates in proper order has biomass separator (3) and screw pressure hydroextractor (4), screw pressure hydroextractor (4) are through setting up liquid phase discharge gate intercommunication on screw pressure hydroextractor (4) have wet-type anaerobic reactor (5), wet-type anaerobic reactor (5) still communicate and have mud to receive fill (6).
2. The sludge and kitchen waste co-processing system according to claim 1, characterized in that: the wet-type anaerobic reactor (5) is provided with a biogas outlet a and a biogas slurry discharge port, the wet-type anaerobic reactor (5) is communicated with a solid-liquid separation device (7) through the biogas slurry discharge port, and the solid-liquid separation device (7) is provided with a filtrate discharge port a and a mud cake discharge port.
3. The sludge and kitchen waste co-processing system according to claim 1, characterized in that: screw pressure hydroextractor (4) still are equipped with slag phase discharge gate, screw pressure hydroextractor (4) loop through slag phase discharge gate and are had feeding buffer tank (13) and dry fermentation formula anaerobic reactor (8) through slag phase pipe (14) intercommunication, be equipped with charge pump (11) on slag phase pipe (14) between feeding buffer tank (13) and dry fermentation formula anaerobic reactor (8), and dry fermentation formula anaerobic reactor (8) still with feeding buffer tank (13) through backward flow marsh slag pipe (12) intercommunication.
4. The sludge and kitchen waste co-processing system according to claim 3, characterized in that: the dry fermentation type anaerobic reactor (8) is provided with a biogas gas outlet b and a biogas residue discharge hole, the biogas residue discharge hole is communicated with a drying bed (9), and the drying bed (9) is provided with a filtrate discharge hole b and a dry biogas residue discharge hole.
5. The sludge and kitchen waste co-processing system according to claim 3, characterized in that: a circulating pipe (10) is further arranged on a slag phase pipe (14) between the feeding buffer tank (13) and the dry fermentation type anaerobic reactor (8), and the other end of the circulating pipe (10) is communicated with the feeding buffer tank (13).
6. The sludge and kitchen waste co-processing system according to claim 1, characterized in that: the kitchen waste receiving hopper and the crushing feeding device (1) are also communicated with a magnetic separation device (2).
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| CN201920559007.5U CN210030377U (en) | 2019-04-23 | 2019-04-23 | Sludge and kitchen waste co-processing system |
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| CN201920559007.5U CN210030377U (en) | 2019-04-23 | 2019-04-23 | Sludge and kitchen waste co-processing system |
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| CN210030377U true CN210030377U (en) | 2020-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112011441A (en) * | 2020-09-08 | 2020-12-01 | 重庆市环卫集团有限公司 | Dry anaerobic digestion system for urban organic garbage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112011441A (en) * | 2020-09-08 | 2020-12-01 | 重庆市环卫集团有限公司 | Dry anaerobic digestion system for urban organic garbage |
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