CN112501214B - Two-phase anaerobic treatment system and method for reinforcing wet garbage in villages and towns - Google Patents

Abstract

The invention discloses a system and method for strengthening two-phase anaerobic treatment of wet garbage in villages and towns, including wet garbage pretreatment, straw pretreatment, and two-phase anaerobic fermentation treatment; the invention adopts directional sorting treatment for pretreatment of wet garbage, High-purity organic waste components are obtained, mixed with straw in a reasonable proportion, and then independently hydrolyzed and acid-producing and methane-producing reactions are carried out.

Description

A system and method for strengthening two-phase anaerobic treatment of wet garbage in villages and towns

technical field

The invention relates to the field of garbage treatment, in particular to a system and method for strengthening two-phase anaerobic treatment of wet garbage.

Background technique

With the rapid development of rural economy and the continuous improvement of residents' living standards, the amount of domestic waste in villages and towns is increasing day by day, more than half of which are wet waste composed of organic components such as kitchen waste. , It is easy to ferment, deteriorate and rot, and it is not only easy to breed pathogenic microorganisms for a long time, but also emits foul gas. The classification effect of wet garbage in villages and towns is poor, and other components will be mixed in the wet garbage, and there will also be yard garbage, branches, leaves, grass and other substances mixed in. If not handled properly, it can seriously affect environmental hygiene and human health. At the same time, the main feature of these wet garbage is that due to incomplete front-end sorting, it contains other garbage components, including vegetable stems and leaves, tree branches and leaves and other cellulose, hemicellulose and lignin substances, and the wet garbage also contains oil. At present, it is mainly disposed of by landfill, incineration and conventional composting.

However, the above methods have the following shortcomings: the landfill technology is not suitable for the treatment of wet waste, cannot realize the recycling of wet waste, and occupies a large amount of land, and the leachate generated during landfill will pollute the soil and groundwater, causing secondary environmental pollution. Although the incineration treatment occupies a small area and has a good volume reduction effect, the wet waste has a high moisture content and a low calorific value, so auxiliary fuel needs to be added, and a large amount of waste gas and waste residue will be generated during the incineration process, especially toxic by-products- Dioxin gas, causing secondary pollution. Conventional composting treatment requires a large site, and the composting fermentation cycle is long, the efficiency is low, the quality of the organic fertilizer is unstable in uneven fermentation, and the finished organic fertilizer requires drying equipment, which increases energy consumption and environmental pollution, and open fermentation treatment produces waste gas. , The problem of odor pollution, the leachate treatment effect is poor, and there is secondary pollution. Compared with conventional solid waste treatment technologies such as landfill, composting and incineration, anaerobic fermentation is a technology that can effectively convert organic waste into methane which can be used as a gaseous fuel, while producing clean energy. , the biogas residue produced by anaerobic fermentation can be further processed into high-quality fertilizer, which is a feasible new technology for resource utilization and environmental protection.

However, because the wet garbage contains cellulose, hemicellulose and lignin substances such as vegetable stems and leaves, tree branches and leaves, and may also contain oil, the conventional anaerobic fermentation technology has poor treatment effect and poor recycling effect.

SUMMARY OF THE INVENTION

Purpose of the invention: One of the purposes of the present invention is to provide a two-phase anaerobic treatment system for strengthening the wet waste in villages and towns, so as to improve the treatment efficiency and resource utilization effect of the system; Phase anaerobic treatment method.

Technical scheme: The present invention provides a method for strengthening two-phase anaerobic treatment of wet garbage in villages and towns, including wet garbage pretreatment, straw pretreatment, and two-phase anaerobic fermentation treatment;

Wherein, the wet garbage pretreatment includes: manually sorting and removing interfering substances in the wet garbage, then performing solid-liquid separation treatment to obtain pre-dewatering garbage, and screening the pre-dewatering garbage according to the content of garbage with different particle sizes. The components are subjected to directional sorting treatment to remove metals, plastics, fibers, and inorganic substances to obtain sorted organic waste; High-purity organic waste of cellulosic substances and glass;

The straw pretreatment includes: crushing the straw to obtain crushed material smaller than 5 mm, preparing the crushed material to remove lignin, and then drying to obtain the pretreated straw;

The two-phase anaerobic fermentation treatment includes: mixing the pretreated straw with the organic waste obtained by the pretreatment of the wet waste, and adding a compound bacterial liquid to obtain a mixed material; sending the mixed material to a hydrolysis and acidification zone, adding hydrolysis The acidifying bacteria carry out the hydrolysis and acidification reaction; the hydrolysis and acidification liquid formed by the hydrolysis and acidification reaction enters the methane-producing zone, and the methanogenic bacteria liquid is added to carry out the anaerobic fermentation reaction.

The above-mentioned treatment method also includes sewage treatment, and the treated sewage comes from sewage after oil-water separation treatment, biogas slurry after centrifugal treatment and sewage from each garbage treatment unit; coagulation air flotation-high-load aeration tank-two-stage The A/O-MBR process treats the sewage, the effluent is reused in the two-phase anaerobic fermentation system and the straw pretreatment system to adjust the humidity, part of the sludge is returned to the front-end first-stage denitrification tank, and the remaining sludge is concentrated and deeply dehydrated. The produced clear liquid is returned to the primary denitrification tank, and the produced slag cake and sludge cake are returned for hydrolysis treatment.

Wherein, the wet garbage pretreatment includes the following steps:

(1) Manual sorting to remove interfering substances in wet garbage, which include large substances such as plastics, glass, and metals;

(2) Perform solid-liquid separation on the remaining wet waste after manual sorting to obtain pre-dewatered waste and oily waste water; oily waste water is subjected to oil-water separation treatment after separation of impurities through pipeline filters, and processed into industrial products after oil extraction Grease and waste water enter the sewage treatment system;

(3) the pre-dewatering garbage obtained in step (2) is subjected to primary sieving treatment to obtain under-sieves with a particle size of less than 40 mm and an over-sieve with a particle size of greater than 40 mm, and the over-sieves are subjected to magnetic separation treatment. Under the action, the metal garbage in the garbage is sorted out, and the residual garbage in the magnetic separation is sent to the air separation treatment, and the weight difference between the components is used for air separation to obtain the medium substance containing organic components;

(4) carrying out the secondary sieving treatment with the first-stage sieving undersize obtained in step (3) to obtain the undersize smaller than 8mm and the oversize larger than 8mm, and the undersize is collected and carried out landfill disposal;

(5) crushing the medium substance obtained in step (2) and the secondary screening oversize obtained in step (3) to obtain a crushed material with a particle size of less than 20 mm, and subjecting the crushed material to stem, leaf and glass sorting treatment , to obtain the remaining organic garbage containing cellulose substances and glass in stems and leaves.

Preferably, in the two-phase anaerobic fermentation process, the compound bacterial liquid includes Trichoderma and Bacillus. By adding compound bacteria composed of Trichoderma and Bacillus, the ratio of bacteria is 1:1, and the concentration of bacteria liquid is 4.5×10 ⁸ CFU/mL, the microbial flora can degrade the cellulose, lignin, and the synergistic effect of this flora, acid-producing bacteria and methanogenic bacteria can improve the degradation rate of organic waste and effectively improve the stability of the system, and the mixed materials are sent to the hydrolysis and acidification tank.

Preferably, the temperature of the hydrolysis and acidification reaction is 35°C to 38°C, and the pH is 6.5 to 7.8; the temperature of the anaerobic fermentation reaction is 55°C to 58°C, and the pH is 7.0 to 7.5.

During the two-phase anaerobic fermentation process, the hydrolysis and acidification reaction is carried out under the condition of medium temperature (35℃～38℃), and the methanogenesis reaction is carried out under the condition of high temperature (55℃～58℃). The removal rate of VS was the highest, and the richness, diversity, uniformity and dominance of bacterial community structure were also the best.

In the two-phase anaerobic fermentation process, the hydrolysis and acidification reaction is carried out under the condition of pH 6.5-7.8, and the methanogenesis reaction is carried out under the condition of pH of 7.0-7.5. In this pH range, the hydrolysis and acidification zone mainly carries out acetic acid and butyric acid fermentation. , which can provide a more favorable substrate for the subsequent methane production process. Wet waste has higher hydrolysis and acidification rates, VFA production is twice that of unadjusted pH, and biogas production is more sensitive to pH. When pH is 7, biogas production highest volume.

Preferably, in the pretreatment of straws, KOH and Ca(OH) ₂ are used in the blending treatment; the mixed VS ratio of pretreated straws and organic waste is 1:3-5.

The combined pretreatment of KOH and Ca(OH) ₂ can effectively remove the lignin in corn stover, destroy the lignocellulosic structure of the stover, increase the accessibility of the substrate, facilitate enzymatic hydrolysis, and improve the conversion rate of anaerobic fermentation.

The treated straw and organic waste are mixed in a mixing ratio of 1:3 to 5. The mixing of the two can adjust the raw material characteristics to the best C/N ratio of 15 to 20, and adjust the fermentation kinetics of acid production and methane production. Rate matching makes the fermentation process more stable.

Preferably, a part of the digested liquid of the anaerobic fermentation reaction in the methane-producing zone is directly refluxed to the hydrolysis and acidification zone for fermentation, and the reflux part accounts for 20-30% of the total volume of the digested liquid; And biogas slurry, the biogas residue is crushed and processed, dried and granulated, and the biogas slurry is used for sewage treatment.

Reusing the digested liquid without solid-liquid separation into the hydrolysis and acidification tank to adjust the solid content can reduce the efflux of the digestive liquid, so that the pH value of the hydrolysis and acidification zone is within the range suitable for the survival of bacteria, and the COD removal effect is better. , the methane content is higher when the recycling ratio is 20-30%.

Due to the incomplete classification in the prior art, when the wet garbage in villages and towns are treated by conventional processes, only simple pre-sorting is carried out, and the sorted materials are relatively rough, and the sorting rate and purity of the wet garbage are not high. The subsequent anaerobic fermentation treatment and recycling effect of the wet garbage have a great impact; the existing village wet garbage is often mixed with garden organic waste such as leaves, because the cellulose, hemicellulose, lignin and other difficulties in the village wet garbage are difficult to achieve. Degradation components, lack of sorting and processing of cellulose components in wet garbage, such garbage often contains a large amount of cellulose, lignin and other substances that inhibit anaerobic fermentation, which will affect the subsequent anaerobic fermentation process. Efficiency is adversely affected; the wet waste in villages and towns usually has high moisture content and organic content, and the C and N are not balanced. In the two-phase anaerobic fermentation, the wet waste is easily hydrolyzed rapidly and accumulates a large amount of volatile fatty acids, resulting in excessive acidification of the system. , thereby inhibiting the activity of methanogens. Adding straw to wet waste can effectively improve the alkaline buffering capacity of the fermentation system, and at the same time adjust the C/N ratio and nutrient composition of the system, thereby improving the efficiency and stability of the fermentation system.

In the present invention, the directional sorting technology is used to sort various wastes of different components in the wet waste, and the organic components that can be anaerobic fermentation are sorted out, and the refractory biodegradable substances in the wet waste are removed. Cellulosic substances in organic wastes are degraded by cellulase to improve the efficiency of anaerobic fermentation of organic wastes and stabilize the fermentation process; pretreat straws and mix them with wet wastes to adjust to the best quality. The C/N ratio improves the efficiency of anaerobic conversion of organic matter; the anaerobic reaction process is decomposed into independent hydrolysis acid production stage and methane production stage, which are connected in series in a certain form to realize a complete anaerobic fermentation process and make hydrolysis acidification. And the effect of methanation is optimized at the same time, which greatly improves the processing capacity of the system and the operating stability of the reactor.

The present invention also provides an enhanced two-phase anaerobic treatment system for wet garbage in villages and towns, including a wet garbage pretreatment system, a straw pretreatment system, a two-phase anaerobic fermentation system, and a sewage treatment and return system;

The wet garbage pretreatment system includes a sorting table, a pre-dehydration device, a water-oil separation device, a first-stage drum screen, a magnetic separator, an air separator, an electrostatic separator, a second-stage drum screen, a hammer impact crusher, Stem and leaf sorting machine, glass sorting machine, first-stage drum screen and second-stage drum screen are respectively equipped with a discharge port for over-sieve material and a discharge port for under-sieve material, and the magnetic separator is equipped with a discharge port for magnetic material and a Magnetic material discharge port, the air separator is equipped with a light material discharge port, a medium material discharge port, and a first-level heavy material discharge port. Further, the wet garbage pretreatment system includes a sorting table, a pre-dehydration device, a first-stage drum screen, a second-stage drum screen, a hammer impact crusher, a stem and leaf sorting machine, and a glass sorting machine, which are connected in sequence. The under-screen material discharge port of the first-stage trommel screen is connected with the feed port of the secondary trommel screen, and the over-screen material discharge port of the first-stage trommel screen is connected with the feed port of the magnetic separator, and the non-magnetic material of the magnetic separator is discharged. The material port is connected with the feed port of the air separator. The medium material discharge port of the air separator and the over-screen material discharge port of the secondary trommel screen are all connected to the feed port of the hammer impact crusher. The light material discharge port is connected with the feed port of the electrostatic separator;

The straw pretreatment system includes a pair of roller crushers, a mixing tank and a first dryer connected in sequence;

The two-phase anaerobic fermentation system includes a hydrolysis acidification tank and a methanogenic tank which are connected to each other, and the discharge ports of the first dryer and the glass sorting machine are all connected with the feed port of the hydrolysis acidification tank;

The sewage treatment and return system includes adjustment tank, air flotation tank, high-load aeration tank, two-stage nitrification-denitrification tank, concentration tank, secondary sedimentation tank, and biological coagulation reaction tank.

Wherein, the hydrolysis and acidification tank includes a first controller, a mechanical stirring device, a pH sensor and a temperature sensor located in the tank, a neutralization liquid tank connected to the tank body through a water pump, and a first liquid inlet system located at the top of the tank; The side wall of the body is provided with an acidizing liquid sampling port, the top is provided with an exhaust port, and the bottom is provided with a slag discharge port; the first controller is connected with a mechanical stirring device, a pH sensor, a temperature sensor, and a neutralization liquid tank;

The methanogenic tank includes a second controller, a mechanical stirring device, a pH sensor and a temperature sensor located in the tank, and a second liquid inlet system located at the top of the tank; the second controller is connected with the mechanical stirring device, the pH sensor and the temperature sensor ; The side wall of the tank is provided with a digestion liquid sampling port and a discharge port, and the discharge port of the methanogenic tank is respectively connected to the horizontal screw centrifuge and the return pipe connected to the methanogenic tank through a pipeline with a diversion component, and the bottom is provided with a discharge port. The slag port is provided with a biogas outlet at the top, and the biogas outlet is connected to the desulfurization and dehydration device and the biogas tank in sequence;

In addition, a communication pipeline is arranged between the exhaust port of the hydrolysis and acidification tank and the methane-producing pipe, and the acidification discharge port of the hydrolysis-acidification tank is connected with the methane-producing tank through a metering pump and a circulation pipe.

Further, the system also includes a biogas residue crusher, a second dryer, and a granulator that are connected in sequence; the decanter centrifuge is provided with a biogas slurry outlet and a biogas residue outlet, and the biogas slurry outlet is connected to the adjustment tank inlet, and the biogas slurry outlet is connected to the adjustment tank inlet. The slag outlet is connected with the inlet of the biogas residue crusher.

The pre-dehydration device is a variable diameter screw dehydrator, the 2θ value of the spiral cone angle is 5-8°, an infrared heating device is arranged in the device, and a pressure regulating device is arranged at the outlet.

As a preference:

(1) A pressure regulating device or a machine head with a smaller outlet is installed at the outlet of the pre-dehydration device, and the pressure build-up of the flow field in the barrel is realized by increasing the obstruction at the outlet.

(2) In the pre-dehydration device, the efficiency of solid-liquid separation can be improved by expanding the spiral cone angle to 2θ=5-8°, and increasing the inner diameter cone angle of the spiral to reduce the cross section of the flow channel.

(3) The pre-dehydration device is equipped with an infrared heating device, which is beneficial to the recovery of oil and the hydrolysis of organic food residues. After heating, the oily wastewater is separated by mechanical extrusion, which reduces the moisture content of the garbage, improves the treatment efficiency of the wet garbage in the subsequent links, and ensures the wet garbage. The continuous and stable degradation of waste can improve the quality of fermented products.

(4) The discharge port of the methanogenic tank is located on the side wall of the methanogenic tank, and a valve is provided at the discharge port of the methanogenic tank. After the valve, the solid-liquid separation device and the connected return pipe are connected to the solid-liquid separation device and the connected return pipe respectively through the pipeline with the shunt. The digested liquid after solid-liquid separation is reused in the hydrolysis and acidification tank to adjust the solid content, which can reduce the efflux of the digestion liquid, so that the pH value of the hydrolysis and acidification zone is within the range suitable for the survival of bacteria, and the better the COD removal effect, the better the recovery effect. When the ratio is 25%, the methane content is higher.

(5) In the two-phase anaerobic reactor, the temperature sensor in the hydrolysis and acidification tank and the temperature sensor in the methanogenic tank are connected to the temperature controller, and the temperature of the material in the tank is detected synchronously, and the outer surface of the hydrolysis and acidification tank and the methanogenic tank are provided with an insulating layer , A circulating hot water pipe is installed between the insulation layer and the device shell, and the circulating hot water pipe is connected to a temperature controller. The temperature controller can independently control the temperature of the circulating water in the two tanks, so that the optimal reaction temperature in the hydrolysis and acidification tank is maintained at 35 ℃ ~ 38 ℃, so that the optimum reaction temperature in the methanogenic tank is maintained at 55℃～58℃. The hydrolysis and acidification reaction was carried out under the condition of mesophilic temperature (35℃～38℃), and the methanogenesis reaction was carried out under the condition of high temperature (55℃～58℃). The richness, diversity, uniformity and dominance of the structure were also optimal.

(6) There is a pH sensor in the hydrolysis and acidification tank, a neutralization liquid tank is set on the right side of the tank body, and the tank is connected by a water pump. The neutralization liquid tank is filled with CaCO ₃ solution, mechanical stirring device, pH sensor, and neutralization liquid tank three The controller is connected to the controller, which is used to synchronously detect the pH value of the material in the tank and adjust and control the material stirring in real time. The pH is controlled at 6.5 to 7.8; the methanogen tank has a mechanical stirring device 15 and a pH sensor in the tank, both of which are connected to the controller. It is used to simultaneously detect the pH value of the material in the tank and control the stirring of the material, and the pH is controlled at 7.0 to 7.5; when the two-phase anaerobic combined reactor is used to treat the wet garbage in villages and towns, the hydrolysis and acidification reaction is carried out at a pH of 6.5 to 7.8. The methanogenesis reaction is carried out at a pH of 7.0 to 7.5. In this pH range, the hydrolysis and acidification zone mainly conducts acetic acid and butyric acid fermentation, which can provide a more favorable substrate for the subsequent methane production process. The wet waste has higher hydrolysis and acidification. The yield of VFA was twice that of the unadjusted pH, and the amount of biogas produced was more sensitive to pH, and the amount of biogas produced was the highest when the pH was 7.

Beneficial effects:

(1) The present invention provides an enhanced two-phase anaerobic fermentation treatment system and method for wet garbage in villages and towns. The components of the garbage are sorted, the organic components that can be anaerobic fermentation are sorted, the sorting efficiency and the purity of the sorted products are improved, impurities are removed, and the recovered and usable components are used for resource utilization.

(2) In view of the refractory biodegradability of cellulose, hemicellulose and lignin substances in wet garbage, they are difficult to degrade during anaerobic fermentation, and may inhibit the anaerobic fermentation of other components; When sorting the wet garbage, the stems, leaves and other cellulose-containing substances contained in the wet garbage are sorted out by the stem and leaf sorting machine. After decomposing, the organic fertilizer is formed and used. For the cellulose substances in the sorted organic garbage, cellulase is used to degrade the cellulose substances, so as to improve the anaerobic fermentation efficiency of the organic garbage and stabilize the fermentation process.

(3) The C/N of wet garbage is low, about 10, while the C/N of straw is high, about 40; the present invention combines the actual conditions of villages and towns, and after a reasonable ratio of wet garbage and corn stalks, it can improve the characteristics of raw materials. Adjust to the optimal C/N ratio of 15-20, so that the microorganisms can obtain sufficient carbon and nitrogen sources, and can also provide sufficient nutrients to solve the problem of insufficient nutritional components of a single substance. The synergistic effect of microorganisms, thereby improving the efficiency of anaerobic conversion of organic matter, raw materials can be obtained locally, saving transportation costs.

(4) The anaerobic reaction process is decomposed into the hydrolysis acid production stage and the methane production stage. The two stages are separated and two reactors are used to avoid mutual inhibition between microorganisms or the inhibitory effect of metabolites on the activity of microorganisms during the reaction process, and improve the The fermentation efficiency is improved, and a suitable growth environment is provided for acid-producing bacteria and methanogenic bacteria. The acid-producing phase and the methane-producing phase that have been successfully operated are two independent processing units that can optimize the operating parameters respectively and connect them in series in a certain form to realize a complete anaerobic fermentation process; since the operating parameters of the two units can be independent Therefore, the effects of hydrolysis, acidification and methanation can be optimized at the same time, and the processing capacity of the system and the operation stability of the reactor can be greatly improved.

(5) The system and method for strengthening the two-phase anaerobic treatment of wet waste in villages and towns of the present invention has good treatment effect and a good degree of integration, and greatly improves the utilization rate of resources.

Description of drawings

Fig. 1 is the schematic diagram of the village and town wet garbage enhanced two-phase anaerobic treatment method of the present invention;

Fig. 2 is the schematic diagram of the two-phase anaerobic treatment system for strengthening the village and town wet garbage of the present invention;

Figure 3 is a schematic diagram of a two-phase anaerobic fermentation reactor of the present invention.

Among them, 1. Hydrolysis and acidification tank; 2. Feed port; 3. Slag discharge port; 4. Acidizing liquid sampling port; 5. Mechanical stirring device; 6. Temperature sensor; 7. pH sensor; ; 9. Acidizing discharge port; 10. Gas delivery pipe; 11. Methanogen tank; 12. Discharge port; 13. Slag discharge port; 14. Digestive liquid sampling port; 15. Mechanical stirring device; 17. pH sensor; 18. Second liquid inlet system; 19. Activated carbon adsorption desulfurization-condensation dehydration-molecular sieve pressure swing adsorption device; 20. Gas flow meter; 21. Biogas outlet; 22. Metering pump; 23. Second control 24. The first controller; 25. The temperature controller; 26. The neutralization liquid tank; 27. The manual sorting table; 31. Magnetic separator; 32. Air separator; 33. Electrostatic separator; 34. Hammer impact crusher; 35. Stem and leaf separator; 36. Glass separator; 37. Roller crusher 38. Mixing tank; 39. First dryer; 40. Two-phase anaerobic fermentation reactor; 41. Decanter centrifuge; 42. Biogas residue crusher; 43. Second dryer; 44. Granulator.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments.

Example 1:

1 is a schematic diagram of the method for strengthening two-phase anaerobic fermentation of village and town wet waste of the present invention. The method for strengthening two-phase anaerobic fermentation of village and town wet waste includes: pretreatment of wet waste, pretreatment of corn stalk, and two-phase anaerobic fermentation. Four parts: oxygen fermentation treatment, sewage treatment and reflux treatment.

The wet garbage pretreatment process is to manually sort out the large interfering substances such as plastic, glass, and metal, and then pre-dehydrate the wet garbage. The components contained in the garbage, the wet garbage is sorted by the directional sorting treatment technology, and the metals, plastics, fibers and inorganic substances in the wet garbage are sorted by magnetic separation, air separation and electrostatic sorting and treated accordingly. and recycling; the organic waste after primary sorting falls into the crushing device, and the organic waste is crushed into 20mm particles; the discharge port of the crushing device is opened, and the organic waste particles fall into the stem and leaf sorting machine for sorting of plant stems and leaves, and then fall into After the glass sorting machine sorts the glass, organic waste with higher purity is obtained.

Among them, the wet garbage pretreatment specifically includes the following steps:

S1. The wet garbage is first sent to the manual sorting table, and the large interfering objects such as plastic, glass, and metal in the wet garbage are preliminarily sorted out manually, and the remaining wet garbage is sent to the solid-liquid separation device through the conveyor belt.

S2. The wet garbage enters the pre-dehydration device, and an infrared heating device is installed to heat the wet garbage. The heating temperature is 45-50 °C, and the radiation power is set to 1kW. The infrared heating of the wet garbage is beneficial to the recovery of oil and the hydrolysis of organic food residues. The oily waste water is separated from the wet waste by screw mechanical extrusion, which reduces the moisture content of the waste, improves the sorting efficiency of the wet waste in the subsequent screening process, and improves the quality of the fermented products. Garbage and oily waste water flow out from the liquid outlet, pass through the pipeline filter to separate impurities and then transport it to the oil-water separation device. After the oil is extracted, it is processed into industrial oil, and the waste water enters the sewage treatment system.

S3. The pre-dehydrated garbage enters the first-stage trommel screen to screen the garbage. The screening aperture is 40mm, the rotation speed is 15-20r/min, and the garbage particles with a particle size larger than 40mm are used as the first-stage trommel screen. The material port is discharged and sent to the magnetic separator. Under the magnetic force of the magnetic separator, the metal waste in the waste is sorted out, and then enters the air separator, and the weight difference between the components on the screen is screened by the first stage. , carry out wind separation, and the sorted medium substances (including organic components, plant stems and leaves, glass) are sent to the hammer impact crusher for crushing, and the heavier materials fall into the heavy garbage collection tank. It is inorganic and can be disposed of by landfill. The lighter materials (including plastics and fibers) are electrostatically separated into plastics and fibers. The garbage particles with a particle size of less than 40mm are collected by the collection tank as sieves and then enter the secondary screening process. .

S4. The material under the primary trommel sieve enters the secondary trommel screen by the belt conveyor. The sieve hole of the secondary trommel sieve is 8mm, the rotation speed is 20-22r/min, and the garbage particles with a particle size larger than 8mm are regarded as the secondary trommel sieve. The material on the trommel screen is discharged from the discharge port and sent to the hammer impact crusher for crushing. The garbage particles with a particle size of less than 8mm are collected by the collection tank as the second-level trommel screen and can be landfilled.

S5. The air-selected medium and secondary trommel sieves enter the hammer impact crusher, and the garbage is fed into the machine from the upper feeding port, and is broken by the high-speed impact of the hammer, and the garbage is crushed into a particle size smaller than 20mm, the hammer impact crusher is equipped with a sieve plate at the lower part of the rotor, the sieve holes on the sieve plate are evenly distributed, and the sieve hole size is 20mm. The particle size is retained on the sieve plate and continues to be hit and ground by the hammer, and finally discharged out of the machine through the sieve plate, and sent to the stem and leaf separator by the conveyor belt.

S6. In the stem and leaf sorting machine, the stems and leaves are sorted according to the different characteristics of the color depth of the garbage particles and the stems and leaves they contain on the contrast of the light perception. First, the garbage in the hopper is fed into the channel by the vibrating feeder into a single row and falls in sequence at a speed of 3.5m/s. The photoelectric detection system optically detects the garbage particles through the light refracted by the background plate under the illumination of fluorescent lamps. The CCD sensor detects and analyzes the garbage particles, and compares the detected color of the stems and leaves with the background contrast color. When the material with the same color as the stems and leaves is captured, it immediately converts its optical signal into an electrical signal, and then judges the processing circuit. After analyzing and processing the signal, command the high-speed solenoid valve to start the high-pressure air nozzle, the pressure is 0.4-0.6MPa, the high-speed jet air blows the stems and leaves into the collection tank, and then is lifted into the secondary feeding hopper by the elevator for secondary coloring. The remaining garbage is sent to the glass sorting machine from the discharge port.

S7. The garbage enters the feeder from the feeding hopper and is transported forward. The garbage falls freely into the glass chute of the optical sorting machine. The high-resolution camera records and analyzes the falling garbage. According to the set program, the compressed air valve The glass is blown precisely to the glass collection tank, and the remaining organic waste is sent to the batching tank.

S8. The stem and leaf substances sorted by the stem and leaf sorting machine and the fibrous substances sorted by electrostatic separation are placed in the fermentation tank, and compound bacterial agents, including fungi, actinomycetes, yeasts, bacteria, are added to the fermentation tank. Compound beneficial bacteria group, control temperature 15～17℃, pH 6～8, humidity 55%～65%, start to heat up after 24 hours of accumulation, and rise to 50～70℃ after 48 hours, need to use planer from time to time during the process Uniform distribution of bacteria, planing to dissipate heat, successful fermentation in 8-16 days, the treated fibrous waste is converted into organic fertilizer and soil matrix that are easily absorbed by soil and plants, and then further processed according to the needs of different plants to produce Fertilizers can be used in many fields such as urban greening, nursery production, breeding and cultivation.

The corn stalk pretreatment is to crush the corn stalk into particles smaller than 5mm, mix with 0.5% KOH and 2% Ca(OH) ₂ , and store it in a sealed state at 38°C for 7 days. The treated corn stalk and organic waste are mixed at a ratio of 1:4. Proportionally mixed, adjusted to the optimum C/N ratio of 15-20 in terms of raw material characteristics; and added compound bacteria composed of Trichoderma and Bacillus, the bacteria ratio was 1:1, and the concentration of the bacteria solution was 4.5×10 ⁷ CFU/ mL.

The pretreatment of corn stover specifically includes the following steps:

S1. Pre-treat the corn stalks, crush the stalks to particles smaller than 5mm by a roller crusher, and then send them to the blending tank for blending, mixing 0.5% KOH and 2% Ca(OH) ₂ at 38°C The combined pretreatment of KOH and Ca(OH) ₂ can effectively remove the lignin in the corn stalk and destroy the lignocellulosic structure of the corn stalk, increase the accessibility of the substrate, and facilitate the enzymatic hydrolysis. Improve the conversion rate of anaerobic fermentation.

S2. Mix the pretreated corn stalks and the organic waste in a mixing ratio of 1:4. The mixing of the two can adjust the raw material characteristics to the best C/N ratio of 15-20, and adjust the fermentation kinetics of acid production and production. The matching of the methane rate makes the fermentation process more stable. The compound bacteria composed of Trichoderma and Bacillus are added, the bacteria ratio is 1:1, and the concentration of the bacteria liquid is 4.5×10 ⁸ CFU/mL. The microbial flora can degrade corn The cellulose and lignin contained in straw and organic waste, and the synergistic effect of this flora, acid-producing bacteria and methanogenic bacteria can improve the degradation rate of organic waste and effectively improve the stability of the system. The mixed materials are sent to hydrolysis and acidification. Can.

The two-phase anaerobic fermentation treatment is to put the prepared materials into the hydrolysis and acidification zone, and carry out the hydrolysis and acidification reaction at medium temperature (35℃～38℃). The chemical spray nozzle is sprayed on the surface of the organic material, and the hydrolyzed and acidified liquid contains a large number of acid-producing bacteria, which are mixed bacteria of Clostridium, Acetobacter, and Mururia. 10 ⁸ CFU/mL, the acidification period is 4d, the formed hydrolyzed acidified liquid enters the methane-producing zone, and carries out anaerobic fermentation reaction at high temperature (55 ℃ ~ 58 ℃), the methanogenic bacteria liquid is pumped into the second liquid inlet pipe by the water pump, The second atomizing nozzle is sprayed onto the surface of the material, and the methanogenic bacteria liquid contains a large number of methanogenic microorganisms, which are mixed bacteria of Methanobacter, Methanothera and Methanosarcina, and the bacteria ratio is 1:1:1. The concentration of microbial bacterial liquid is 5.5×10 ⁸ CFU/mL; the anaerobic fermentation cycle is 10d, and the generated biogas is successively removed by activated carbon adsorption desulfurization-condensation dehydration-molecular sieve pressure swing adsorption to remove impurities such as CO ₂ and then sent to the biogas tank for storage, which can be used for Power generation or heat supply as fuel, 25% of the digested liquid is returned to the hydrolysis and acidification tank to adjust the solid content, 75% of the digested liquid is sent to the decanter centrifuge for solid-liquid separation through the effluent overflow pipe, and the biogas residue and biogas liquid are separated. , the biogas residue is crushed by the biogas residue crusher and then dried and granulated, and the biogas slurry is sent to the sewage collection tank.

The two-phase anaerobic fermentation treatment specifically includes the following steps:

S1. In the hydrolysis and acidification tank, a mechanical stirrer is used to stir the material, the rotation speed is 50r/min, the stirring time is controlled at 20min/h, a thermal insulation layer is arranged in the tank, and there is a circulating hot water layer between the thermal insulation layer and the device shell. The temperature of the acidification process is maintained at 35℃～38℃ through the temperature controller. The hydrolysis and acidification tank is equipped with a neutralization liquid tank filled with CaCO3 solution. _The tank is connected by a water pump to adjust the pH in the tank, so that the pH is controlled at 6.5-7.8 , the hydrolyzed and acidified bacteria liquid is sprayed on the material through the atomizing nozzle, and the hydrolyzed and acidified liquid contains a large number of acid-producing bacteria, which are mixed bacteria of Clostridium, Acetobacter, and Murine sp. The concentration of the solution was 5.5×10 ⁸ CFU/mL, and the acidification period was 4 days.

S2. The hydrolyzed acidified liquid after hydrolysis and acidification is sent to the methanogenic tank for digestion through the feeding pipe, and the methanogenic bacteria liquid is sprayed on the material through the atomizing nozzle. The methanogenic bacteria liquid contains a large number of methanogenic microorganisms, which are Methanobacter , the mixed bacteria of Methanococcus and Methanosarcina, the proportion of bacteria is 1:1:1, the concentration of microbial bacteria liquid is 5.5×10 ⁸ CFU/mL, and the methanogenic tank is also provided with a stirrer and a stirrer. The rotating speed of the tank is 50r/min, the stirring time is controlled at 20min/h, the pH value is controlled at 7.0 to 7.5, a thermal insulation layer is set in the tank, and there is a circulating hot water layer between the thermal insulation layer and the device shell, and the temperature is controlled at 55℃-58℃, Digestion cycle 10d;

S3. 25% of the digested liquid in the methane-producing area is returned to the hydrolysis and acidification tank to adjust the solid content, and can relieve the VFA inhibitory effect of the acidified phase and improve the methane production performance of the methane phase. 75% of the digested liquid is sent through the effluent overflow pipe. After entering the decanter centrifuge for solid-liquid separation, the biogas residue and biogas liquid are separated. The biogas residue is crushed by the biogas residue crusher and then dried and granulated. The biogas liquid is sent to the sewage collection tank. Molecular sieve pressure swing adsorption removes impurities such as CO ₂ and then sends it to the biogas tank for storage.

Sewage treatment and backflow treatment, the treated sewage comes from sewage separated by oil-water separator, biogas slurry separated by decanter centrifuge, leachate of each garbage treatment unit, daily drainage of each workshop, domestic sewage, etc. , adopt coagulation air flotation - high load aeration tank - two-stage A/O-MBR process to treat sewage, anaerobic biogas slurry is transported to the adjustment tank, and then pumped into the subsequent air flotation treatment unit through the water pump, before entering the air flotation unit Adding a certain amount of flocculant and coagulant to the wastewater can remove suspended solids and grease, as well as remove colloids and some phosphates. Then it enters the secondary sedimentation tank for mud-water separation, and the effluent from the secondary sedimentation tank flows into the two-stage nitrification-denitrification tank to remove the remaining organic matter and nitrogen pollutants in the wastewater. The two-phase anaerobic system and straw pretreatment system are used to adjust the humidity. Part of the sludge is returned to the front-end primary denitrification tank, and part of the sludge is discharged into the concentration tank as excess sludge. The sludge in the air flotation tank and the sedimentation tank is also discharged into the concentration tank. After the sludge is concentrated, it enters the biological coagulation reaction tank for deep dehydration, and the generated clear liquid is returned to the first-level denitrification tank, and the generated slag cake and sludge cake are returned to the hydrolysis system.

Example 2:

As shown in FIG. 2 , an enhanced two-phase anaerobic treatment system for wet garbage in villages and towns of the present invention is composed of a wet garbage pretreatment system, a corn stover pretreatment system, an enhanced two-phase anaerobic fermentation system, and a sewage treatment and return system.

Among them, the wet garbage pretreatment system is used to sort, screen, crush and pre-dehydrate the wet garbage. This system includes: a discharge hopper, a manual sorting table 27, a pre-dehydration device, a water-oil separation device, and a first-stage drum screen. 29. Magnetic separator 31, air separator 32, electrostatic separator 33, secondary trommel screen 30, hammer impact crusher 34, stem and leaf separator 35, glass separator 36, primary trommel screen and two The trommel screen is equipped with a discharge port for the material above the screen and a discharge port for the material under the screen. The magnetic separator is provided with a discharge port for magnetic materials and a non-magnetic material discharge port, and the air separator is provided with a discharge port for light materials. , medium material discharge port, first-level heavy material discharge port.

Among them, the manual sorting table, the pre-dehydration device, the primary trommel screen, the secondary trommel screen, the hammer impact crusher, the stem and leaf sorter, and the glass sorter are connected in sequence, and the sieve of the primary trommel screen is discharged. The outlet is connected to the feed port of the secondary trommel screen, the material discharge port of the first trommel screen is connected to the feed port of the magnetic separator, and the non-magnetic material discharge port of the magnetic separator is connected to the feed port of the air separator. The outlet of the medium substance of the air separator and the outlet of the upper sieve of the secondary trommel screen are all connected with the inlet of the hammer impact crusher, and the outlet of the light substance of the air separator is connected to the electrostatic outlet. The feed port of the sorting machine is connected.

The manual sorting table 27 is composed of a plate chain conveyor, the width of the rack is 1.3m, the moving speed of the belt does not exceed 0.3m/s, and there is a feeding port and a discharging port. The wet garbage enters the manual sorting table through the feeding port. , The rubber, metal, glass, etc. in the garbage are sorted out by manual sorting, and the remaining wet garbage is transported out from the discharge port. The lower part of the discharge port is provided with a conveyor belt, and the conveyor belt can transport the wet garbage to the solid-liquid separation device.

The pre-dehydration device is a variable diameter screw deliquoring machine 28, which is mainly composed of a variable diameter screw, a motor, a filter cartridge and a machine head. 50℃, the radiation power is set to 1kW, the wet waste is added to the funnel from the feed port, and the screw is driven by the motor to rotate. The material is transported forward and squeezed and deliquored by the combined action of the screw, the filter cartridge and the machine head, and the screw speed is 20rpm. , the pre-dehydrated garbage is discharged from the discharge port and falls into the conveyor belt to be sent to the No. 1 trommel screen, that is, the first-level trommel screen 29, and the oily waste water is sent from the liquid outlet to the oil-water separator for oil-water separation.

The cylinder body of No. 1 trommel screen is placed at an inclination, and the cylinder body is covered by a dust-proof sealing cover. The upper end of the inclined drum is provided with a feeding port, the lower end of the inclined drum is provided with a discharge port for the material on the screen, and there is a reducer in the drum. Adjust the drum to rotate at a certain speed, the drum speed is 15 ~ 20r/min, the lower part of the inclined drum is provided with a sieve collection groove, the screen holes on the inclined drum are evenly distributed, the diameter of the screen holes is 40mm, and the inclination angle of the drum is 7 ～10°, after the wet garbage is screened by the drum, the material on the screen is sent to the magnetic separator by the conveyor belt arranged at the lower part of the discharge port of the material on the screen, and the material under the screen is collected by the collection tank of the under screen and sent to the No. 2 drum Screen 30, the secondary trommel screen.

The magnetic separator 31 is a cylindrical magnetic separator, which is composed of a rotating multi-pole magnetic system and a non-magnetically conductive cylinder on the outside. The discharge port is connected to the garbage collection tank; when the wet garbage passes through the cylindrical magnetic separator, under the combined action of the magnetic force and the mechanical force, the metal is adsorbed on the belt and falls into the metal collection box, and the wet garbage after the metal is removed. The garbage enters the collection tank, and the conveyor belt is set under the collection tank, and the conveyor belt is connected to the air separator.

The air separator 32 includes a frame, a conveyor belt rotatably connected to the upper end of the frame, a feed inlet located at the lower end of the conveyor belt, a suction duct located at the high end of the conveyor belt, and a fan located on the suction duct. The right side of the blower is provided with Heavy garbage collection trough, the right side of the heavy garbage collection tank is provided with a light garbage collection tank. Wet garbage is fed into the feeding port through the conveyor belt, and the heavier materials fall into the heavy garbage collection tank, which is mainly composed of inorganic substances, which can be landfilled; lighter materials fall into the light garbage collection tank, such as plastics, fibers, etc. Wait. The wind speed of the blower is 1.6-2.1 m/s.

The cylinder body of No. 2 trommel screen is placed in an inclined manner, and the cylinder body is covered by a dust-proof sealing cover. The high-end of the inclined drum is provided with a feeding port, the lower end of the inclined drum is provided with a discharge port for the material on the screen, and a reducer is installed in the drum. The adjusting cylinder rotates at a certain speed, the lower part of the inclined drum is provided with a collection tank for under-sieves, and the screen holes on the inclined drum are evenly distributed. ～10°; after the under-sieve of No. 1 trommel screen is screened by the drum, the over-sieve and the air-selected garbage from the wind separator enter the hammer impact crusher together; the under-sieve is collected by the under-sieve collection tank, Can be landfilled.

Hammer impact crusher 34 is composed of hammer, rotating shaft, disc, bearing, impact plate, sieve plate, etc. The hammer head is movably hinged on the turntable of the rotor, the rotating shaft together with the turntable are supported on the rolling bearing seats on both sides of the casing, and the motor drives the The rotor rotates at high speed in the crushing chamber. The material is fed into the machine from the upper feeding port, and is crushed by the high-speed impact of the hammer, and the garbage is crushed into a particle size of less than 20mm. The size of the sieve hole is 20mm. The particle size smaller than the sieve hole size in the crushed material is discharged through the sieve plate, and the coarse particle size larger than the sieve hole size is retained on the sieve plate and continues to be hit and ground by the hammer, and finally discharged out of the machine through the sieve plate. , sent to the glass sorting machine by the conveyor belt.

Stem and leaf sorting machine 35 is a photoelectric color sorting machine, which is mainly composed of CCD sensor, high-speed magnetic valve, nozzle, discharging mechanism and other parts. Falling at a speed of 3.5m/s, the photoelectric detection system optically detects the garbage particles through the light refracted by the background plate under the illumination of the fluorescent lamp. By comparison, when the substance with the same color as the stem and leaf is captured, its optical signal is immediately converted into an electrical signal, and then the signal is analyzed and processed by the judgment processing circuit, and the pulsed compressed air ejected from the nozzle controlled by the high-speed solenoid valve will The stems and leaves are blown away from the normal motion track and fall into the collection tank, and then lifted by the elevator into the secondary feeding hopper for secondary color sorting, and the remaining garbage is sent to the glass sorting machine from the discharge port. Among them, the photoelectric color sorter is equipped with a return device such as a hoist, which can automatically re-select the stems and leaves with low precision after one color selection, which is equivalent to having two first-level color sorters for two-level color sorting at the same time. The plant stems and leaves in the wet garbage can be sorted to the maximum extent, saving a lot of manpower, material resources and time, and at the same time, it is also conducive to the improvement of color sorting accuracy.

The glass sorting machine 36 adopts an optical sorting machine, including a feeding hopper, a feeder, a glass chute, a high-resolution camera, and a compressed air valve. In the glass chute of the sorting machine, a high-resolution camera records and analyzes the falling garbage. According to the set program, the compressed air valve accurately blows the glass to the glass collection tank, and the remaining garbage is sent to the batching tank through the conveyor belt.

Corn stover pretreatment system is used to pretreat corn stover to remove lignin, cellulose, hemicellulose and other substances contained in it, so as to achieve the best state of anaerobic fermentation mixed with organic waste. This system includes: roller type Crusher 37 , mixing tank 38 , first dryer 39 . There are two rollers inside the counter-roll crusher, and the surfaces of the two rollers are serrated. The two rollers rotate to crush the corn stalks and crush the corn stalks to a particle size of less than 5mm. The counter-roll crusher is at the lower part of the rollers. There is a sieve plate, the sieve holes on the sieve plate are evenly distributed, the sieve hole size is 5mm, the particle fraction smaller than the sieve hole size in the crushed corn stalk is discharged through the sieve plate, and the coarse particle size larger than the sieve hole size is retained on the sieve plate to continue. For crushing, the pair of roller crushers have a feeding port at the top and a discharging port at the bottom, and the crushed corn stalks are sent to the mixing tank through a conveyor belt arranged at the lower part of the discharging port. The mixing tank is provided with a feeding port, a discharging port and a liquid inlet, and is equipped with a mechanical stirring device, a heating device and a temperature sensor. The corn stalk enters the tank through the feeding port, and KOH enters the tank through the liquid inlet. The device is fully stirred, the temperature is controlled at 38° C., sealed for 7 days, dried by the first dryer 39 and sent to the hydrolysis and acidification tank.

The enhanced two-phase anaerobic fermentation system is used for the combined two-phase anaerobic fermentation of pretreated corn stover and waste. The system includes: two-phase anaerobic fermentation reactor 40, decanter centrifuge 41, and biogas residue crusher 42 , The second dryer 40, the granulator 44, the biogas gas storage tank, and the sewage collection tank.

As shown in FIG. 3 , the two-phase anaerobic fermentation reactor of the present invention is divided into two parts: a hydrolysis acidification tank 1 and a methanogenic tank 11 . The hydrolysis and acidification tank 1 is provided with a feeding port 2 and a discharging port 9. There is a mechanical stirring device 5, a pH sensor 7 in the tank, and a neutralization liquid tank 26 is provided on the right side of the tank body. The tank is connected by a water pump. CaCO3 solution is installed, and the mechanical stirring device ₅ , pH sensor 7, and neutralization liquid tank 26 are connected to the first controller 24 for synchronously detecting the pH value of the material in the tank and adjusting and controlling the material stirring in real time. 6.5 to 7.8, a first liquid inlet system 8 is installed on the top of the hydrolysis and acidification tank, including a first liquid inlet pipe and a first atomizing nozzle, the first atomizing nozzles are evenly distributed on the first liquid inlet pipe, and the first liquid inlet pipe passes through. The water pump is connected to the storage tank of the hydrolyzed and acidified liquid, and the hydrolyzed and acidified liquid contains a large number of acid-producing bacteria, such as Clostridium, Acetobacter, and S. 11 is connected for conveying acidification liquid. There is a gas conveying pipe 10 between the hydrolysis acidification tank 1 and the methanogenic tank 11. The acidification liquid sampling port 4 is provided on the side wall of the hydrolysis acidification tank, and the slag discharge port 3 is provided at the bottom of the hydrolysis acidification tank. There is a temperature sensor 6 in the hydrolysis and acidification tank. The temperature sensor is connected with the temperature controller 25 to detect the temperature of the material in the tank synchronously. An insulation layer is arranged on the outer surface of the hydrolysis and acidification tank. The pipe is connected to the temperature controller 25, and the temperature controller controls the temperature of the circulating water, so that the optimal reaction temperature in the tank is maintained at 35°C to 38°C.

The tank of the methanogenic tank 11 has a mechanical stirring device 15 and a pH sensor 17, both of which are connected to the second controller 23 for synchronously detecting the pH value of the material in the tank and controlling the stirring of the material. The pH is controlled at 7.0 to 7.5. A second liquid inlet system 18 is installed on the top, including a second liquid inlet pipe and a second atomizing nozzle, the second atomizing nozzles are evenly distributed on the second liquid inlet pipe, and the second liquid inlet pipe is connected to the methanogenic bacteria liquid storage through a water pump Tank, the methanogenic bacteria liquid contains a large number of methanogenic microorganisms inoculated in the methanogenic tank, such as Methanobacter, Methanobacillus, Methanosarcina, etc., and the side wall of the methanogenic tank is provided with a digestive liquid sampling port 14, There is a slag discharge port 13 at the bottom of the methanogenic tank, and a temperature sensor 16 is arranged in the methanogenic tank. The temperature sensor is connected with the temperature controller 25 to detect the temperature of the material in the tank synchronously. A circulating hot water pipe is installed between them, and the circulating hot water pipe is connected to the temperature controller 25. The temperature controller controls the temperature of the circulating water, so that the optimal reaction temperature in the tank is maintained at 55°C to 58°C. The valve, after the valve is connected to the decanter centrifuge and the return pipe connected to the methanogenic tank 11 through a pipeline with a shunt component, 25% of the digestion solution is returned from the return pipe to the hydrolysis and acidification tank to adjust the solid content, 75% of the digestion solution It is sent to a horizontal screw centrifuge through a pipeline for solid-liquid separation, and a biogas outlet 21 is provided on the top of the methane-producing tank. The purified biogas is sent to the biogas tank for storage.

The biogas residue is crushed by the biogas residue crusher 42 and then dried and granulated, and the biogas residue is sequentially sent to the biogas residue crusher 42 , the second dryer 43 and the granulator 44 .

The horizontal screw centrifuge 41 is mainly composed of a drum, a screw conveyor, a differential, and a transmission component; it is provided with a feeding port, a discharging port and a liquid outlet, and the material is squeezed and deliquored in the machine, and the solid The biogas residue after liquid separation is discharged from the discharge port and sent to the biogas residue crusher.

The biogas residue crusher 42 is mainly composed of frame, rotor, transmission parts, etc.; the frame part is all welded with carbon steel plates and channel steel; the rotor part is crushed by double-layer blades, and the material enters the crushing chamber from the feeding port, and is processed by The continuous grinding of the double-layer blade makes the material meet the granulation requirements. The transmission parts are driven by belts, and the pulleys and belts are driven by the motor, which are directly transmitted to the main shaft, so that the main shaft rotates at a high speed to achieve the crushing effect; the crushed biogas residue enters the second dryer.

The second dryer 43 is mainly composed of a heat source, a rotary drum, an induced draft fan, etc. The second dryer is provided with a feeding port and a discharge valve. After the biogas residue enters the second dryer from the feeding port, it is copied When the plate is turned over, it fully contacts with the hot air, which speeds up the drying heat transfer and mass transfer; the dried biogas residue is discharged from the discharge valve to the granulator.

The granulator 44 is a disc granulator. The angle of the granulation disc adopts an overall arc structure, and the granulation rate can reach more than 94%; The pellet tray is provided with a discharge port, and the fertilizer with a particle size of 3-5mm is discharged from the discharge port. After cooling, it is measured and packaged to form a high-quality fertilizer, which is convenient for storage and use.

Sewage treatment and return system, the treated sewage comes from sewage separated by oil-water separator, biogas slurry separated by decanter centrifuge, leachate of each garbage treatment unit, daily drainage of each workshop, domestic sewage, etc. Using coagulation air flotation-high-load aeration tank-two-stage A/O-MBR process to treat sewage, including regulating tank, air flotation tank, high-load aeration tank, secondary sedimentation tank, two-stage nitrification-denitrification tank, MBR Reaction pool, concentration pool, biological coagulation reaction pool, slag remover, etc. The sewage is transported to the adjustment tank, and then pumped into the subsequent air flotation treatment unit through the water pump. A certain amount of flocculant and coagulant are added to the wastewater before entering the air flotation unit, which can remove suspended solids and grease. The colloid and some phosphates are removed, and the effluent of the air flotation unit is pumped to the high-load aeration tank. After removing most of the organic matter, it enters the secondary sedimentation tank for mud-water separation. The effluent from the secondary sedimentation tank flows into the two-stage nitrification-denitrification tank to remove waste The remaining organic matter and nitrogen pollutants are finally separated from the mud and water through the built-in MBR membrane module. The effluent is reused in the two-phase anaerobic system and the straw pretreatment system to adjust the humidity. Part of the sludge is returned to the front-end first-stage denitrification tank, and part of the sludge is returned to the front-end denitrification tank. As excess sludge, it is discharged into the concentration tank, and the sludge in the air flotation tank and the secondary sedimentation tank is also discharged into the concentration tank. After the sludge is concentrated, it enters the biological coagulation reaction tank for deep dehydration, and the generated clear liquid is returned to the primary denitrification. The slag cake and sludge cake produced are returned to the anaerobic fermentation system.

Claims (6)

1. A method for strengthening two-phase anaerobic treatment of wet garbage in villages and towns, characterized in that: comprising wet garbage pretreatment, straw pretreatment, and two-phase anaerobic fermentation treatment; The wet garbage pretreatment includes: manually sorting and removing the interfering substances in the wet garbage, then performing solid-liquid separation treatment to obtain pre-dewatering garbage, and after screening the pre-dewatering garbage, according to the components contained in the garbage with different particle sizes. Orientation sorting is carried out to remove metals, plastics, fibers and inorganic substances to obtain sorted organic waste; , plant stems and leaves, and glass are broken to obtain high-purity organic wastes containing cellulose substances and glass in stems and leaves; In the fermentation tank, add compound bacterial agent to the fermentation tank; Wherein the wet garbage pretreatment includes the following steps: (1) Manual sorting to remove interferences in wet garbage, including plastics, glass, and metals; (2) Perform solid-liquid separation on the remaining wet waste after manual sorting to obtain pre-dewatered waste and oily waste water; oily waste water is subjected to oil-water separation treatment after separation of impurities through pipeline filters, and processed into industrial products after oil extraction Grease and waste water enter the sewage treatment system; (3) the pre-dewatering garbage obtained in step (2) is subjected to primary sieving treatment to obtain under-sieves with a particle size of less than 40 mm and an over-sieve with a particle size of greater than 40 mm, and the over-sieves are subjected to magnetic separation treatment. Under the action, the metal garbage in the garbage is sorted out, and the residual garbage in the magnetic separation is sent to the air separation treatment, and the weight difference between the components is used for air separation to obtain the medium substance containing organic components; (4) carrying out the secondary sieving treatment with the first-stage sieving undersize obtained in step (3) to obtain the undersize smaller than 8mm and the oversize larger than 8mm, and the undersize is collected and carried out landfill disposal; (5) crushing the medium substance obtained in step (2) and the secondary screening oversize obtained in step (3) to obtain a crushed material with a particle size of less than 20 mm, and subjecting the crushed material to stem, leaf and glass sorting treatment , to obtain the remaining organic garbage containing cellulosic substances and glass in stems and leaves; The straw pretreatment includes: crushing the straw to obtain crushed material smaller than 5 mm, preparing the crushed material to remove lignin, and then drying to obtain the pretreated straw, wherein KOH and Ca are used in the preparation treatment. (OH) ₂ combined pretreatment; the VS ratio of pretreated straw and organic waste is 1:3～5; The two-phase anaerobic fermentation treatment includes: mixing the pretreated straw with the organic waste obtained by the above-mentioned wet waste pretreatment, and adding a composite bacterial liquid to obtain a mixed material, the composite bacterial liquid includes Trichoderma and Bacillus, two The ratio of bacteria to the bacteria was 1:1, and the concentration of the bacteria solution was 4.5×10 ⁸ CFU/mL; the mixture was sent to the hydrolysis and acidification zone, and the hydrolysis and acidification bacteria were added to carry out the hydrolysis acidification reaction; the hydrolysis acidification solution formed by the hydrolysis acidification reaction entered the production process. In the methane zone, the methanogenic bacteria solution is added to carry out anaerobic fermentation reaction; a part of the digested solution of the anaerobic fermentation reaction in the methane-producing zone is directly refluxed to the hydrolysis and acidification zone for fermentation, and the reflux part accounts for 20-30% of the total volume of the digested solution; the remainder is digested The liquid is subjected to solid-liquid separation treatment to separate biogas residue and biogas slurry. The biogas residue is crushed and then dried and granulated. 2. The method for strengthening two-phase anaerobic treatment of wet garbage in villages and towns according to claim 1, characterized in that: in the two-phase anaerobic fermentation treatment process; 7.8; the temperature of the anaerobic fermentation reaction is 55°C to 58°C, and the pH value is 7.0 to 7.5. 3. The method for strengthening two-phase anaerobic treatment of wet garbage in villages and towns according to claim 1, is characterized in that: it also comprises sewage treatment, and the treated sewage comes from sewage after oil-water separation treatment, biogas slurry after centrifugal treatment and separation, and Sewage from each waste treatment unit; coagulation air flotation-high-load aeration tank-two-stage A/O-MBR process is used to treat sewage, and the effluent is reused for two-phase anaerobic fermentation system and straw pretreatment system to adjust humidity, sludge Part of it is returned to the front-end primary denitrification tank. After the excess sludge is concentrated and deeply dehydrated, the resulting clear liquid is returned to the primary denitrification tank, and the resulting slag cake and sludge cake are returned for hydrolysis treatment. 4. A two-phase anaerobic treatment system for strengthening wet garbage in villages and towns, characterized in that: it includes a wet garbage pretreatment system, a straw pretreatment system, a two-phase anaerobic fermentation system, a sewage treatment and a return system; The wet garbage pretreatment system includes a sorting table, a pre-dehydration device, a first-stage drum screen, a second-stage drum screen, a hammer impact crusher, a stem and leaf sorting machine, a glass sorting machine, and a first-stage drum screen. The discharge port of the under sieve is connected to the feed port of the secondary trommel screen, the discharge port of the top sieve of the primary trommel screen is connected to the feed port of the magnetic separator, and the non-magnetic material discharge port of the magnetic separator is connected to the feed port of the magnetic separator. The feeding port of the air separator is connected, the medium material discharge port of the air separator and the upper screen discharge port of the secondary trommel screen are connected with the feeding port of the hammer impact crusher, and the light weight of the air separator is connected. The material discharge port is connected to the feed port of the electrostatic separator; the pre-dehydration device is a variable diameter screw deliquoring machine, and the 2θ value of the spiral cone angle is 5-8°. With pressure regulating device; The straw pretreatment system includes a pair of roller crushers, a mixing tank and a first dryer connected in sequence; The two-phase anaerobic fermentation system includes a hydrolysis acidification tank and a methanogenic tank which are connected to each other, and the discharge ports of the first dryer and the glass sorting machine are all connected with the feed port of the hydrolysis acidification tank; The sewage treatment and return system includes adjustment tank, air flotation tank, high-load aeration tank, two-stage nitrification-denitrification tank, concentration tank, secondary sedimentation tank, and biological coagulation reaction tank. 5. The village and town wet garbage strengthening two-phase anaerobic treatment system according to claim 4 is characterized in that: The hydrolysis and acidification tank includes a first controller, a mechanical stirring device, a pH sensor and a temperature sensor located in the tank, a neutralization liquid tank connected to the tank body through a water pump, and a first liquid inlet system located at the top of the tank; the side of the tank body The wall is provided with an acidizing liquid sampling port, the top is provided with an exhaust port, and the bottom is provided with a slag discharge port; the first controller is connected with a mechanical stirring device, a pH sensor, a temperature sensor, and a neutralization liquid tank; The methanogenic tank includes a second controller, a mechanical stirring device, a pH sensor and a temperature sensor located in the tank, and a second liquid inlet system located at the top of the tank; the second controller is connected with the mechanical stirring device, the pH sensor and the temperature sensor ; The side wall of the tank is provided with a digestion liquid sampling port and a discharge port, and the discharge port of the methanogenic tank is respectively connected to the horizontal screw centrifuge and the return pipe connected to the methanogenic tank through a pipeline with a diversion component, and the bottom is provided with a discharge port. The slag port is provided with a biogas outlet at the top, and the biogas outlet is connected to the desulfurization and dehydration device and the biogas tank in sequence; A communication pipeline is arranged between the exhaust port of the hydrolysis and acidification tank and the methane-producing pipe, and the acidification discharge port of the hydrolysis-acidification tank is connected with the methane-producing tank through a metering pump and a circulation pipe. 6. The two-phase anaerobic treatment system for strengthening wet garbage in villages and towns according to claim 4, characterized in that: it further comprises a biogas residue crusher, a second dryer and a granulator which are connected in sequence; The decanter centrifuge is provided with a biogas liquid outlet and a biogas residue outlet, the biogas liquid outlet is connected with the inlet of the regulating tank, and the biogas residue outlet is connected with the inlet of the biogas residue crusher.

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