CN214937410U - Kitchen waste and kitchen waste mixed dry anaerobic fermentation treatment system - Google Patents
Kitchen waste and kitchen waste mixed dry anaerobic fermentation treatment system Download PDFInfo
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- CN214937410U CN214937410U CN202120862373.5U CN202120862373U CN214937410U CN 214937410 U CN214937410 U CN 214937410U CN 202120862373 U CN202120862373 U CN 202120862373U CN 214937410 U CN214937410 U CN 214937410U
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Abstract
The utility model discloses a kitchen garbage mixes dry-type anaerobic fermentation processing system with rubbish from cooking, including kitchen garbage preprocessing unit, the rubbish from cooking preprocessing unit, be used for carrying out the compounding case that mixes and be used for dry-type anaerobic fermentation's anaerobic reactor to the kitchen garbage after the preliminary treatment and the rubbish from cooking, kitchen garbage preprocessing unit and the discharge gate of the rubbish from cooking preprocessing unit all link up with the compounding case feed inlet, the compounding case discharge gate links up with the anaerobic reactor feed inlet. The utility model discloses can simultaneous processing kitchen garbage and kitchen garbage, can reduce the production volume of natural pond liquid, corresponding reduction later stage natural pond liquid treatment cost reduces economic cost.
Description
Technical Field
The utility model belongs to the field of refuse treatment, especially, relate to a kitchen garbage and surplus rubbish mix dry-type anaerobic fermentation processing system in kitchen.
Background
The municipal domestic waste comprises kitchen waste and kitchen waste, the kitchen waste is mainly made of organic substances, the kitchen waste and the kitchen waste are generally treated by adopting an anaerobic fermentation technology, the harmless treatment is realized, simultaneously clean energy biogas is obtained, the ecological environment is improved, and the biogas residue generated by the anaerobic fermentation can be developed into a high-quality organic fertilizer which is applied to farmlands to improve soil and increase the soil fertilizer efficiency, however, the kitchen waste is generally made of a wet anaerobic fermentation technology which has been applied in domestic kitchen waste treatment projects for many years, the technical maturity is high, the kitchen waste is stable and reliable, however, the wet anaerobic fermentation has the disadvantages that the solid content in the fermentation process needs to be controlled within 10 percent to ensure that the fermentation process can be smoothly carried out, but a large amount of biogas slurry is generated, the biogas slurry is high-concentration kitchen wastewater, and the subsequent biogas slurry treatment difficulty is high, so that the biogas slurry treatment cost is too high. For kitchen waste, from the kitchen waste treatment plants built in China at present, the projects for independently treating the kitchen waste and really operating the kitchen waste are not many, and the independent treatment process of the kitchen waste mostly adopts an aerobic composting technology which has relatively low pretreatment requirement, less investment and low operation cost. However, in the actual operation process, the biggest problem existing after kitchen waste composting is the marketing problem of compost products, particularly after the treatment scale is enlarged, the large-scale continuous production and the seasonal demand of the fertilizer market have great supply-demand contradictions, and a great amount of compost products are not required to be made full of saliva in the fertilizing off season.
Therefore, with the gradual establishment and matching of large-scale treatment projects, the market of kitchen and kitchen waste treatment projects will be dominated by medium and small scale in the future, and for medium and small-scale catering and kitchen waste treatment projects, due to the small volume and no scale effect, if corresponding projects are established for independent treatment, firstly, the raw materials fluctuate greatly along with seasons, the incoming materials are unstable, the stability of project operation is poor, secondly, the investment economy and the operation cost investment are not calculated, and in addition, the components and the quality of kitchen and kitchen waste change in the future, the synergistic treatment of kitchen waste and kitchen waste is an optimal treatment scheme, so how to provide a mixed waste treatment system for mixed treatment of kitchen waste and kitchen waste with less biogas slurry generation amount is particularly important.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: how to provide a kitchen garbage and kitchen garbage mixed dry-type anaerobic fermentation processing system, can handle kitchen garbage and kitchen garbage simultaneously, can reduce the output of natural pond liquid, corresponding reduction later stage natural pond liquid treatment cost, reduce economic cost.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a dry anaerobic fermentation treatment system for mixing kitchen waste and kitchen waste comprises a kitchen waste pretreatment unit, a mixing box for mixing the pretreated kitchen waste and the kitchen waste and an anaerobic reactor for dry anaerobic fermentation, wherein discharge ports of the kitchen waste pretreatment unit and the kitchen waste pretreatment unit are connected with a feed port of the mixing box, and a discharge port of the mixing box is connected with a feed port of the anaerobic reactor;
the kitchen waste pretreatment unit comprises a large substance sorting machine, a hydraulic pulper and a three-phase centrifuge, wherein the hydraulic pulper is connected with a discharge port of the large substance sorting machine, the three-phase centrifuge is connected with a slurry outlet of the hydraulic pulper, the large substance sorting machine is used for sorting kitchen waste supplied materials so as to sort out sundries with the particle size of more than or equal to 60mm, the hydraulic pulper is used for crushing and pulping the sorted waste, the three-phase centrifuge is used for removing oil and water from the slurry prepared by the hydraulic pulper, and a solid phase discharge port of the three-phase centrifuge is connected with a feed port of a mixing box;
the kitchen remains garbage preprocessing unit is including broken bag shredder and link up the magnet separator that sets up in broken bag shredder discharge gate department, the discharge gate of magnet separator links up the screening unit, and the oversize outward transportation of screening unit is burned with the landfill, and its undersize discharge gate links up with the compounding case feed inlet, broken bag shredder is used for breaking the bag and shredding the rubbish remaining in kitchen, the magnet separator is used for getting rid of the metalwork in the rubbish remaining in kitchen.
Preferably, the top of the anaerobic reactor is provided with a biogas outlet, the biogas outlet is connected with a biogas storage tank through a pipeline, the bottom of the anaerobic reactor is provided with a discharge port, the discharge port is respectively connected with a connecting pipe and a return pipe, the other end of the connecting pipe is connected with a solid-liquid separation mechanism to carry out solid-liquid separation on part of biogas slurry generated by anaerobic reaction, and the other end of the return pipe is introduced into the mixing box to be mixed and inoculated with new materials.
Preferably, the screening unit comprises a rotary screen and a butterfly screen, a feed port of the rotary screen is connected with a discharge port of the magnetic separator, a discharge port of undersize of the rotary screen is connected with a feed port of the butterfly screen, undersize of the butterfly screen is conveyed to a first organic garbage temporary storage tank through a screw conveyor for temporary storage, the first organic garbage temporary storage tank is communicated with a feed port of the mixing box, and oversize of the rotary screen and oversize of the butterfly screen are both transported outwards to be buried and burned.
As optimization, a horizontally arranged stirring shaft is arranged in the mixing box, a spiral blade is sleeved on the stirring shaft, and the stirring shaft rotates around the transverse central axis of the mixing box body under the action of a driving motor so as to uniformly mix incoming materials of the kitchen waste and the kitchen waste after pretreatment.
Preferably, the discharge port of the mixing box is connected with a feeding pump for pumping the materials in the mixing box into the anaerobic reactor.
As optimization, be equipped with the inlet pipe of vertical setting in the anaerobic reactor, the lower extreme of inlet pipe and the discharge gate intercommunication of charge pump, the upper end of inlet pipe is located anaerobic reactor internal top in order to realize anaerobic reactor's upper portion feeding, the anaerobic reactor bottom is the back taper, and the anaerobic reactor discharge gate is located its bottom center.
As optimization, solid-liquid separation mechanism includes shale shaker, screw extrusion hydroextractor and horizontal screw centrifuge, and the feed inlet and the connecting pipe one end intercommunication of shale shaker, the undersize discharge gate of shale shaker links up with the feed inlet of screw extrusion hydroextractor, screw extrusion hydroextractor has first natural pond sediment discharge gate and first waste liquid discharge gate, and the first waste liquid discharge gate of screw extrusion hydroextractor links up with horizontal screw centrifuge's feed inlet, horizontal screw centrifuge has second natural pond sediment discharge gate and second waste liquid discharge gate, and first natural pond sediment discharge gate and second natural pond sediment discharge gate all link up screw conveyer in order to transport the natural pond sediment outward to filling up and burn, and second waste liquid discharge gate and sewage treatment system are connected in order to purify the waste liquid.
Compared with the prior art, the utility model following beneficial effect has: the utility model is designed by considering the characteristics of the kitchen waste and the advantages and disadvantages of the dry anaerobic fermentation process, the kitchen waste not only has high water content, but also contains more grease, the solid content of the kitchen garbage is high, the components are complex, the selection of the pretreatment process and the anaerobic process is greatly different, therefore, after the kitchen waste and the kitchen waste are correspondingly pretreated, the kitchen waste and the kitchen waste are introduced into the mixing box to be mixed, the materials can be complemented in terms of maintaining the stability of the supplied materials or moisture content and components, therefore, the kitchen waste and kitchen waste are not required to be conditioned, so that compared with the individual treatment, the mixed treatment of the kitchen waste and the kitchen waste has the advantages of simpler process, short flow, less biogas amount, much lower later biogas slurry treatment cost and lower whole economic cost.
Drawings
Fig. 1 is a block diagram of the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the specific implementation: referring to fig. 1, a dry anaerobic fermentation treatment system for mixing kitchen waste and kitchen waste comprises a kitchen waste pretreatment unit, a mixing box 1 for mixing the kitchen waste and the kitchen waste after pretreatment, and an anaerobic reactor 2 for dry anaerobic fermentation, wherein discharge ports of the kitchen waste pretreatment unit and the kitchen waste pretreatment unit are both connected with a feed port of the mixing box, and a discharge port of the mixing box is connected with a feed port of the anaerobic reactor;
the kitchen waste pretreatment unit comprises a large substance sorting machine 3, a hydraulic pulper 4 connected and arranged at a discharge port of the large substance sorting machine and a three-phase centrifuge 5 connected at a slurry outlet of the hydraulic pulper, wherein the large substance sorting machine is used for sorting kitchen waste supplied materials so as to sort out sundries with the particle size of more than or equal to 60mm, the hydraulic pulper is used for crushing and pulping the sorted waste, the three-phase centrifuge is used for removing oil and water from the slurry prepared by the hydraulic pulper, and a solid phase discharge port of the three-phase centrifuge is connected with a feed port of a mixing box;
the kitchen remains garbage preprocessing unit is including broken bag shredder 6 and link up the magnet separator 7 that sets up at broken bag shredder discharge gate department, the discharge gate of magnet separator links up the screening unit, and the oversize outward transportation of screening unit burns with the landfill, and its undersize discharge gate links up with the compounding case feed inlet, broken bag shredder is used for breaking the bag and shredding the kitchen remains rubbish, the magnet separator is used for getting rid of the metalwork in the kitchen remains rubbish.
In the utility model, kitchen garbage and kitchen garbage are respectively pretreated, and the pretreatment is carried out according to respective characteristics, for example, kitchen garbage is characterized by high water content and oil content, and other sundries are contained, large-particle sundries are sorted out by a large-material sorting machine during the treatment, and then the kitchen garbage is crushed and pulped in a hydraulic pulping machine, so that glass and other garbage can not be hammered to prevent the glass slag from blocking and damaging subsequent parts, solid slag such as separated plastic and the like is extruded and dehydrated by a squeezer to be transported and buried outside the extruded material, organic slurry is continuously fed into a three-phase centrifuge to separate oil and water, the organic solid slag is discharged from a solid phase discharge port of the three-phase centrifuge to be temporarily stored in a second temporary storage tank 8 and then fed into a mixing tank after reaching a certain amount, and the obtained organic solid slag is deoiled and dewatered, the subsequent anaerobic reactor is not acidified and damaged, and the later-period methane quantity is improved. The kitchen garbage is characterized in that the components are complex, the garbage quality and characteristics fluctuate greatly along with seasonality, a large amount of silt, plastic bags, metallic devices and other sundries are doped in the garbage, when the garbage is pretreated, the bag breaking and tearing machine breaks the sundries such as the plastic bags, then the magnetic separator magnetically attracts the metallic parts and removes the metallic parts, finally the sieving unit sieves the garbage, the oversize product is transported outside, the undersize product enters the mixing box and is mixed with the treated kitchen garbage, the materials can be complemented both in terms of maintaining the stability of the supplied materials and in terms of moisture content and components, the water source does not need to be additionally added in addition to the moisture carried by the garbage, the amount of the materials and the water to be introduced into the mixing box is controlled to enable the solid content to reach 20% -30%, compared with the independent treatment, the process is simpler and the flow is shorter, after dry anaerobic fermentation is carried out, less biogas slurry is produced, and the later biogas slurry treatment cost is reduced.
Preferably, the top of the anaerobic reactor 2 is provided with a biogas outlet, the biogas outlet is connected with a biogas storage tank 9 through a pipeline, the bottom of the anaerobic reactor is provided with a discharge port, the discharge port is respectively connected with a connecting pipe and a return pipe, the other end of the connecting pipe is connected with a solid-liquid separation mechanism to perform solid-liquid separation on part of biogas slurry generated by anaerobic reaction, and the other end of the return pipe is introduced into the mixing box to be mixed and inoculated with new materials.
Thus, after the treated kitchen waste and kitchen waste are mixed in the mixing box, the amount of the kitchen waste and the kitchen waste is controlled to enable the solid content of the mixed kitchen waste to reach 20% -30%, materials in the mixing box are introduced into an anaerobic reactor and then are subjected to dry anaerobic fermentation, the generated biogas flows out to a biogas storage tank through a biogas outlet at the top for storage, the materials subjected to the fermentation reaction settle down along with gravity, one part of the materials are circulated to a solid-liquid separation mechanism through a connecting pipe for further treatment, the separated biogas slurry is subjected to post treatment, the separated solid slag is transported externally, the other part of the materials are returned to the mixing box through a return pipe to be mixed and inoculated with new materials, when mixing is carried out, 1 time of fresh raw materials is matched with 6-9 times of return materials for external circulation mixing, and the materials can complete one circulation in the anaerobic reactor every 2-3 days, by the method, the degradation rate of organic matters can be improved, and various materials can be flexibly matched, so that the impact resistance of the mixed garbage treatment system is stronger.
Preferably, the screening unit comprises a rotary screen 10 and a butterfly screen 11, a feed port of the rotary screen is connected with a discharge port of the magnetic separator, a discharge port of undersize of the rotary screen is connected with a feed port of the butterfly screen, undersize of the butterfly screen is conveyed to a first temporary storage tank 13 through a screw conveyor for temporary storage, the first temporary storage tank is communicated with a feed port of the mixing box, and oversize of the rotary screen and oversize of the butterfly screen are both transported outwards to be buried and burned.
Therefore, by arranging the rotary screen and the butterfly screen for secondary screening, the plastic garbage, the eggshells, the peels and the like which are broken and shredded in the front can be screened, a part of water can be left, the mixture can be conveniently mixed with solid-phase residues after the kitchen garbage is treated in the later period, a mixed material with the solid content of 20% -30% is formed, and dry anaerobic fermentation is conveniently carried out.
As optimization, a horizontally arranged stirring shaft is arranged in the mixing box, a spiral blade is sleeved on the stirring shaft, and the stirring shaft rotates around the transverse central axis of the mixing box body under the action of a driving motor so as to uniformly mix incoming materials of the kitchen waste and the kitchen waste after pretreatment.
Therefore, by arranging the stirring shaft and the helical blades on the stirring shaft, the kitchen waste and kitchen waste treatment material can be uniformly mixed, the solid content is uniform, and the fermentation efficiency in the later-stage anaerobic reactor is improved.
Preferably, the discharge port of the mixing box is connected with a feeding pump for pumping the materials in the mixing box into the anaerobic reactor.
Thus, the feeding of the anaerobic reactor 2 is generally from above, while the mixing box is generally located on the ground, and the feeding of the mixed materials into the anaerobic reactor can be better carried out by pumping through the feeding pump.
As optimization, be equipped with the inlet pipe of vertical setting in the anaerobic reactor, the lower extreme of inlet pipe and the discharge gate intercommunication of charge pump, the upper end of inlet pipe is located anaerobic reactor internal top in order to realize anaerobic reactor's upper portion feeding, the anaerobic reactor bottom is the back taper, and the anaerobic reactor discharge gate is located its bottom center.
Therefore, the feeding and discharging modes in the anaerobic reactor are upward feeding and downward discharging, the materials can gradually settle downward along with the gravity along with the fermentation reaction, and finally go out from the discharging port at the bottom, the bottom of the anaerobic reactor is in an inverted cone shape, the discharging of the discharging port is more convenient, and the materials are more easily discharged from the discharging port under the action of gravity at the conical surface at the bottom.
As an optimization, solid-liquid separation mechanism 12 includes shale shaker, screw extrusion hydroextractor and horizontal screw centrifuge, and the feed inlet and the connecting pipe one end intercommunication of shale shaker, the undersize discharge gate of shale shaker links up with the feed inlet of screw extrusion hydroextractor, screw extrusion hydroextractor has first natural pond sediment discharge gate and first waste liquid discharge gate, and the first waste liquid discharge gate of screw extrusion hydroextractor links up with horizontal screw centrifuge's feed inlet, horizontal screw centrifuge has second natural pond sediment discharge gate and second waste liquid discharge gate, and first natural pond sediment discharge gate and second natural pond sediment discharge gate all link up screw conveyer in order to transport the natural pond sediment outward to filling up and burn, and second waste liquid discharge gate and sewage treatment system are connected in order to purify the waste liquid.
Therefore, the solid-liquid separation mechanism comprises a vibrating screen, a spiral extrusion dehydrator and a horizontal spiral centrifugal machine, residual large substances or heavy substances such as broken bowls, plastic bags, chopsticks and the like are firstly screened out through the vibrating screen, then the primary separation of liquid phase and solid phase of biogas slurry is firstly carried out through the spiral extrusion dehydrator in a secondary separation mode, then the secondary separation is carried out through the horizontal spiral centrifugal machine, waste liquid and biogas residue are obtained through separation, the secondary separation effect is better, and the treatment difficulty of the biogas slurry is reduced.
While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents, and thus the embodiments of the invention are intended only as illustrative examples of the invention and no matter how the embodiments of the invention may be seen in any way limit the scope of the invention.
Claims (7)
1. The utility model provides a kitchen garbage and kitchen garbage mixed dry-type anaerobic fermentation processing system which characterized in that: the kitchen waste pretreatment device comprises a kitchen waste pretreatment unit, a mixing box for mixing the pretreated kitchen waste and the kitchen waste, and an anaerobic reactor for dry anaerobic fermentation, wherein discharge ports of the kitchen waste pretreatment unit and the kitchen waste pretreatment unit are connected with a feed port of the mixing box, and a discharge port of the mixing box is connected with a feed port of the anaerobic reactor;
the kitchen waste pretreatment unit comprises a large substance sorting machine, a hydraulic pulper and a three-phase centrifuge, wherein the hydraulic pulper is connected with a discharge port of the large substance sorting machine, the three-phase centrifuge is connected with a slurry outlet of the hydraulic pulper, the large substance sorting machine is used for sorting kitchen waste supplied materials so as to sort out sundries with the particle size of more than or equal to 60mm, the hydraulic pulper is used for crushing and pulping the sorted waste, the three-phase centrifuge is used for removing oil and water from the slurry prepared by the hydraulic pulper, and a solid phase discharge port of the three-phase centrifuge is connected with a feed port of a mixing box;
the kitchen remains garbage preprocessing unit is including broken bag shredder and link up the magnet separator that sets up in broken bag shredder discharge gate department, the discharge gate of magnet separator links up the screening unit, and the oversize outward transportation of screening unit is burned with the landfill, and its undersize discharge gate links up with the compounding case feed inlet, broken bag shredder is used for breaking the bag and shredding the rubbish remaining in kitchen, the magnet separator is used for getting rid of the metalwork in the rubbish remaining in kitchen.
2. The kitchen waste and kitchen waste mixing dry type anaerobic fermentation treatment system according to claim 1, characterized in that: the anaerobic reactor is characterized in that a biogas outlet is arranged at the top of the anaerobic reactor and is connected with a biogas storage tank through a pipeline, a discharge port is arranged at the bottom of the anaerobic reactor and is respectively connected with a connecting pipe and a return pipe, the other end of the connecting pipe is connected with a solid-liquid separation mechanism to carry out solid-liquid separation on part of biogas slurry generated by anaerobic reaction, and the other end of the return pipe is introduced into the mixing box to be mixed with new materials for inoculation.
3. The kitchen waste and kitchen waste mixing dry type anaerobic fermentation treatment system according to claim 1, characterized in that: the screening unit comprises a rotary screen and a butterfly screen, a feed port of the rotary screen is connected with a discharge port of the magnetic separator, a screen underflow discharge port of the rotary screen is connected with a feed port of the butterfly screen, screen underflow of the butterfly screen is conveyed to a first organic garbage temporary storage tank through a screw conveyor to be temporarily stored, the first organic garbage temporary storage tank is communicated with a feed port of a mixing box, and screen overflow of the rotary screen and screen overflow of the butterfly screen are all transported outwards to be buried and burned.
4. The kitchen waste and kitchen waste mixing dry type anaerobic fermentation treatment system according to claim 1, characterized in that: the mixing box is internally provided with a horizontally arranged mixing shaft, the mixing shaft is sleeved with a helical blade, and the mixing shaft rotates around the transverse central axis of the mixing box body under the action of a driving motor so as to uniformly mix incoming materials of kitchen waste and kitchen garbage after pretreatment.
5. The kitchen waste and kitchen waste mixing dry type anaerobic fermentation treatment system according to claim 1, characterized in that: and a discharge port of the mixing box is connected with a feed pump for pumping the materials in the mixing box into the anaerobic reactor.
6. The dry anaerobic fermentation treatment system for mixing the kitchen waste and the kitchen waste according to claim 5, characterized in that: be equipped with the inlet pipe of vertical setting in the anaerobic reactor, the lower extreme of inlet pipe and the discharge gate intercommunication of charge pump, the upper end of inlet pipe is located anaerobic reactor top in order to realize anaerobic reactor's upper portion feeding, anaerobic reactor bottom is the back taper, and the anaerobic reactor discharge gate is located its bottom center.
7. The dry anaerobic fermentation treatment system for mixing the kitchen waste and the kitchen waste according to claim 2, characterized in that: solid-liquid separation mechanism includes shale shaker, screw extrusion hydroextractor and horizontal screw centrifuge, and the feed inlet and the connecting pipe one end intercommunication of shale shaker, the undersize discharge gate of shale shaker and the feed inlet of screw extrusion hydroextractor link up, screw extrusion hydroextractor has first natural pond sediment discharge gate and first waste liquid discharge gate, and the first waste liquid discharge gate of screw extrusion hydroextractor links up with horizontal screw centrifuge's feed inlet, horizontal screw centrifuge has second natural pond sediment discharge gate and second waste liquid discharge gate, and first natural pond sediment discharge gate and second natural pond sediment discharge gate all link up screw conveyer in order to pack up the natural pond sediment outward and burn, and second waste liquid discharge gate and sewage treatment system are connected in order to purify the waste liquid.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440707A (en) * | 2020-04-29 | 2020-07-24 | 重庆市环卫集团有限公司 | Dry type anaerobic fermentation treatment system for mixed garbage |
| 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 |
| CN114686528A (en) * | 2022-04-29 | 2022-07-01 | 成都市兴蓉再生能源有限公司 | Method for kitchen and kitchen waste synergistic anaerobic reaction |
-
2021
- 2021-04-25 CN CN202120862373.5U patent/CN214937410U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440707A (en) * | 2020-04-29 | 2020-07-24 | 重庆市环卫集团有限公司 | Dry type anaerobic fermentation treatment system for mixed garbage |
| 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 |
| CN114686528A (en) * | 2022-04-29 | 2022-07-01 | 成都市兴蓉再生能源有限公司 | Method for kitchen and kitchen waste synergistic anaerobic reaction |
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