A method and device for coordinated treatment of sludge and livestock and poultry manure

Abstract

The present invention belongs to the technical field of harmless treatment of sludge and livestock and poultry manure, and relates to a method and device for the coordinated treatment of sludge and livestock and poultry manure. The method for the coordinated treatment of sludge and livestock and poultry manure comprises: uniformly mixing the sludge and biogas residue, adding high-temperature red-hot biochar for thermal conditioning, mechanical filter pressing and dehydration, mixing the filter pressing solid phase with the aerobic composting of livestock and poultry manure after self-heat drying, and then sequentially performing pyrolysis carbonization and pyrolysis activation, a part of the high-temperature red-hot biochar produced by pyrolysis activation is used for thermal conditioning, and the other part is cooled to obtain high-quality biochar. The method and device provided by the present invention can improve the difficulty of dehydrating sludge and livestock and poultry manure, fully utilize resources, and the quality of biochar obtained by pyrolysis is high.

Description

Technical Field

[0001] The invention belongs to the technical field of harmless treatment of sludge and livestock and poultry excrement, and in particular relates to a method and device for coordinated treatment of sludge and livestock and poultry excrement. Background Art

[0002] In the field of resource utilization of solid waste in small and medium-sized towns, reduction and harmlessness have always been important directions, but how to achieve efficient and rapid coordinated treatment and high-value utilization of products has become the main problem faced by small and medium-sized towns. Organic solid wastes such as urban sewage plant sludge and livestock and poultry manure are considered to be the most promising and inexhaustible "urban mineral deposits". The amount of sludge produced in small and medium-sized towns is small, the nutrients in composting treatment are insufficient, and the investment in incineration treatment is large, which is not suitable for sludge treatment in small and medium-sized towns. At present, pyrolysis technology provides a new development direction and possibility for the rapid reduction, harmlessness and energy conversion of organic solid waste. However, the energy consumption of preparing biochar by pyrolysis of sludge is high, and the obtained pyrolytic charcoal has problems such as high ash content, low porosity and low quality. This limits the further promotion of sludge pyrolysis technology, especially when sludge biochar is used for soil improvement, the nutrients are insufficient and the heavy metal leaching is easily exceeded, which greatly limits its application. Furthermore, in the vicinity of intensive farming, the use of agriculture and forestry to absorb and compost livestock and poultry manure has reached the ecological carrying limit, and the loss of elements such as nitrogen and phosphorus is serious. It is urgent to develop new technologies for reducing, harmless and resource-based livestock and poultry manure. Since the pyrolysis process can also achieve rapid reduction and harmlessness of livestock and poultry manure, it is important to develop a synergistic pyrolysis resource utilization process for sludge and livestock and poultry manure, make full use of livestock and poultry manure to improve the quality of sludge biochar, and achieve rapid resource utilization and high-value complementarity of the two products, which is of great significance to the sustainable development of small and medium-sized towns.

[0003] CN110563487A discloses a method for preparing anaerobic sludge-based biochar, which comprises the following steps: evenly mixing the main material anaerobic sludge and the auxiliary material livestock and poultry manure, aerobically fermenting the obtained mixture, and performing low-temperature carbonization treatment at 450-550°C after the fermentation, and then adding a deodorant after vacuum filtration, cooling, washing, drying, crushing, screening, and obtaining anaerobic sludge-based biochar. However, the method has complicated procedures and high costs, and the moisture content of the anaerobic sludge needs to be reduced to less than 80% before mixing with livestock and poultry manure, and the dehydration efficiency of the anaerobic sludge is extremely low, and the quality of the anaerobic sludge-based biochar finally obtained is low. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the existing sludge and livestock and poultry manure separate treatment process that the dehydration is difficult and the quality of the biochar obtained by pyrolysis is low, and to provide a method and device for the coordinated treatment of sludge and livestock and poultry manure that can improve the dehydration efficiency of sludge and livestock and poultry manure and improve the quality of the biochar obtained by pyrolysis.

[0005] Specifically, the present invention provides a method for co-processing sludge and livestock and poultry manure, the method comprising:

[0006] S1, mixing the sludge and the biogas residue evenly, adding the high-temperature red-hot biochar to the obtained mixture and stirring and mixing evenly to perform thermal conditioning, and then dehydrating by mechanical filter pressing to obtain a filter press solid phase and a filter press liquid phase;

[0007] S2, subjecting the filtrate phase to anaerobic fermentation, returning the biogas residue produced by the anaerobic fermentation to step S1 for mixing with the sludge for conditioning, and directly utilizing the biogas liquid produced by the anaerobic fermentation as liquid fertilizer;

[0008] S3, aerobic composting and autothermal drying of livestock and poultry manure, the manure after aerobic composting and autothermal drying is evenly mixed with the filter press solid phase in step S1 to form a pyrolysis material, which is sent to a pyrolysis furnace for pyrolysis treatment. The pyrolysis furnace includes a pyrolysis carbonization section and a pyrolysis activation section that are interconnected. The pyrolysis material is first sent to the pyrolysis carbonization section for pyrolysis carbonization at 300-500°C for 10-30 minutes, and then the pyrolysis carbonization product is sent to the pyrolysis activation section for pyrolysis activation at 900-1000°C for 30-50 minutes. The pyrolysis gas generated by the pyrolysis activation is used as fuel together with the biogas generated by anaerobic fermentation in step S2. A part of the high-temperature red-hot biochar generated by the pyrolysis activation is returned to step S1 for thermal conditioning, and the other part is cooled to obtain high-quality biochar.

[0009] Furthermore, in step S1, the wet basis mass ratio of the sludge to the biogas residue is (50% to 70%): (50% to 30%).

[0010] Furthermore, in step S1, the addition amount of the high-temperature red-hot biochar is 15% to 20% of the wet basis mass of the sludge and biogas residue mixture.

[0011] Furthermore, in step S1, the heat conditioning time is 15 to 30 minutes.

[0012] Furthermore, in step S1, the water content of the solid phase obtained by mechanical filtration dehydration is ≤40%.

[0013] Furthermore, in step S2, the carbon-nitrogen ratio used in the anaerobic fermentation is (10-40):1, and the pH value is 5.5-7.5.

[0014] Furthermore, in step S3, the moisture content of the livestock and poultry manure after aerobic composting and autothermal drying is ≤30%.

[0015] Furthermore, in step S3, the amount of manure added after aerobic composting autothermal drying is 10% to 30% of the mass of the filter press solid phase.

[0016] Furthermore, in step S3, the high-temperature red-hot biochar is indirectly cooled by air to become high-quality biochar, and the odor generated by the aerobic composting of livestock and poultry manure is used as the air required for fuel combustion after heat exchange with the flue gas exhaust generated by pyrolysis and the air heated by the high-temperature red-hot biochar. At this time, not only can energy recycling and odor purification be achieved, but also energy consumption can be further reduced, and the energy-saving benefits of the process are significant.

[0017] Furthermore, the method for coordinated treatment of sludge and livestock and poultry manure provided by the present invention also includes using high-quality biochar as a soil conditioner or adsorption material to achieve high-value utilization; and / or purifying the flue gas exhaust after heat exchange to achieve standard emissions.

[0018] In addition, the present invention also provides a device for the coordinated treatment of sludge and livestock and poultry manure, including a sludge storage bin, a 1# conveying device, a 1# mixing device, a 2# conveying device, a conditioning device, a 3# conveying device, a mechanical filter press device, a 4# conveying device, a 2# mixing device, a 5# conveying device, a pyrolysis device, a 7# conveying device, a compost drying device, a 6# conveying device, an 8# conveying device, a fermentation device, a 9# conveying device, a cooling device, a 11# conveying device, a product storage bin, a 12# conveying device and a liquid fertilizer storage bin, wherein the pyrolysis device includes a pyrolysis carbonization section and a pyrolysis activation section that are interconnected;

[0019] The sludge storage bin outlet is connected to the inlet of the 1# conveying device, the outlet of the 1# conveying device is connected to the sludge feeding port of the 1# mixing device, the outlet of the 1# mixing device is connected to the inlet of the 2# conveying device, the outlet of the 2# conveying device is connected to the inlet of the conditioning device, the outlet of the conditioning device is connected to the inlet of the 3# conveying device, and the outlet of the 3# conveying device is connected to the inlet of the mechanical filter press; the solid phase outlet of the mechanical filter press is connected to the inlet of the 4# conveying device, the outlet of the 4# conveying device is connected to the inlet of the 2# mixing device, the outlet of the 2# mixing device is connected to the inlet of the 5# conveying device, and the outlet of the 5# conveying device is connected to the inlet of the pyrolysis carbonization section of the pyrolysis device; the liquid phase outlet of the mechanical filter press is connected to the inlet of the 8# conveying device, and the outlet of the 8# conveying device is connected to the fermentation device. The inlet of the device is connected, the sludge outlet of the fermentation device is connected to the inlet of the 9# conveying device, the biogas outlet of the fermentation device is connected to the inlet of the 12# conveying device, the outlet of the 12# conveying device is connected to the inlet of the liquid fertilizer storage bin, and the outlet of the 9# conveying device is connected to the sludge inlet of the 1# mixing device; the first solid outlet of the pyrolysis activation section in the pyrolysis device is connected to the inlet of the cooling device, the outlet of the cooling device is connected to the inlet of the 11# conveying device, the outlet of the 11# conveying device is connected to the inlet of the product storage bin, the second solid outlet of the pyrolysis activation section is connected to the inlet of the 7# conveying device, and the outlet of the 7# conveying device is connected to the inlet of the conditioning device; the solid outlet of the compost drying device is connected to the inlet of the 6# conveying device, and the outlet of the 6# conveying device is connected to the inlet of the 2# mixing device.

[0020] Furthermore, the device for coordinated treatment of sludge and livestock and poultry manure provided by the present invention also includes a 10# conveying device, a combustion device and a 2# fan, the gas phase outlet of the fermentation device is connected to the inlet of the 10# conveying device, and the outlet of the 10# conveying device is connected to the gas inlet of the combustion device; the odor outlet of the compost drying device is connected to the cooling medium inlet of the cooling device, the heating odor outlet in the cooling device is connected to the inlet of the 2# fan, and the outlet of the 2# fan is connected to the air inlet of the combustion device.

[0021] Furthermore, the device for coordinated treatment of sludge and livestock and poultry manure provided by the present invention also includes a heat exchange device, a purification device, a 1# fan and a chimney. The hot flue gas outlet of the combustion device is connected to the inlet of the pyrolysis device, and the flue gas exhaust outlet of the pyrolysis device is connected to the flue gas exhaust inlet of the heat exchange device; the flue gas exhaust outlet of the heat exchange device is connected to the inlet of the purification device, the outlet of the purification device is connected to the inlet of the 1# fan, the outlet of the 1# fan is connected to the chimney, the air outlet of the heat exchange device is connected to the inlet of the 2# fan, and the outlet of the 2# fan is connected to the air inlet of the combustion device.

[0022] Furthermore, the sludge storage bin is a concrete storage bin.

[0023] Furthermore, the 1# conveying device, 2# conveying device, 3# conveying device and 9# conveying device are mud pumps.

[0024] Furthermore, the 4# conveying device, the 5# conveying device, and the 6# conveying device are screw conveyors, belt conveyors, or scraper conveyors.

[0025] Furthermore, the 7# conveying device is a high-temperature chain conveyor or a high-temperature resistant inclined chute.

[0026] Furthermore, the 8# conveying device and the 12# conveying device are water pumps.

[0027] Furthermore, the 10# conveying device is a gas blower.

[0028] Furthermore, the 11# conveying device is a pneumatic conveyor, a screw conveyor, a belt conveyor or a scraper conveyor.

[0029] Furthermore, the 1# mixing device is an open mixing tank with a stirring device.

[0030] Furthermore, the conditioning device is a closed mixing tank with a stirring device.

[0031] Furthermore, the mechanical filter press device is a plate and frame filter press or a high-pressure belt dehydrator.

[0032] Furthermore, the 2# mixing device is a mixing mill, a double-shaft mixer, a plowshare mixer or a ribbon mixer.

[0033] Furthermore, the pyrolysis device is a two-stage indirect heating drum pyrolysis furnace.

[0034] Furthermore, the compost drying device is a conventional composting system.

[0035] Furthermore, the fermentation device is a conventional anaerobic fermentation device.

[0036] Furthermore, the combustion device is a coal gas or natural gas combustion furnace.

[0037] Furthermore, the cooling device is an air-indirect cooling drum.

[0038] Furthermore, the 2# fan is an induced draft fan.

[0039] Furthermore, the product storage bin and liquid fertilizer storage bin are ordinary steel bins.

[0040] Furthermore, the heat exchange device is a common flue gas indirect heat exchanger.

[0041] Furthermore, the purification device is a common flue gas and exhaust gas purification system.

[0042] Furthermore, the 1# fan is a flue gas induced draft fan.

[0043] Furthermore, the chimney is a conventional steel chimney or a concrete chimney.

[0044] The sludge and biogas residue have high organic matter content, mainly bacteria and extracellular polymers. The presence of a large number of colloidal particles leads to poor filterability and difficulty in dehydration, and both have the problem of high processing costs. The prior art adds chemical conditioning agents to significantly improve the dehydration performance through bridging and charge neutralization, but the large amount of addition leads to a significant increase in the final waste and high cost. After the biogas residue and sludge are evenly mixed, the present invention uses red-hot biochar as a conditioning agent. On the one hand, high-temperature carbon residue can be used to directly contact the aqueous mixture (biogas residue and sludge mixture) to achieve rapid thermal wall breaking and dehydration; on the other hand, the addition of red-hot biochar can easily significantly increase the temperature of the material in the local area, promote the dissolution of biochar salt and alkali, and further improve the dehydration performance. Furthermore, since red-hot charcoal residue (high-temperature red-hot biochar) has the characteristics of hard and porous particles and irregular microscopic surface, the silicon and aluminum salts on its surface dissolve in water to form a large number of positively charged ions, which neutralize the negative charge in the sludge and destabilize the sludge particles. The colloidal particles break the wall and flocculate with each other, which further improves the sedimentation and dewatering performance of the sludge, greatly improves the filterability and dewatering efficiency. In addition, red-hot charcoal residue is a self-product of the system, so the treatment process does not generate additional new waste, which has obvious advantages over adding chemical agents.

[0045] The pyrolysis furnace adopted in the present invention is a two-stage heating, including a pyrolysis carbonization section and a pyrolysis activation section, wherein the temperature of the pyrolysis carbonization section is 300-500°C and the material residence time is 10-30min, the temperature of the pyrolysis activation section is 900-1000°C and the material residence time is 30-50min, the material flow direction is the same as the pyrolysis gas flow direction, and the carbonized product obtained by pyrolysis in the pyrolysis carbonization section enters the pyrolysis activation section of the furnace body, and the water vapor and tar and other organic matter generated in the carbonization section further produce an activation reaction with the carbonized product, and the tar molecules with larger molecular weight are further cracked on the surface of the carbonized product and in the pores, realizing carbon film deposition and achieving a "coating" effect. On the one hand, the pore structure is changed, the porosity is increased, the functional groups are improved, and the quality of the biochar is improved. On the other hand, the water vapor and tar gas generated in the carbonization section are used as activators in the activation section to generate small molecular substances such as CO, H2, CH4, etc. through gasification reaction, thereby improving the calorific value of the outlet gas and avoiding the influence of water vapor on subsequent combustion.

[0046] The present invention makes full use of the heat generation characteristics of the composting process of organic matter in manure to achieve manure dehydration pretreatment, greatly saving dehydration energy. In addition, the biochar powder produced by the system can be added during the composting process, which can increase the self-heating temperature of the compost drying by 3 to 5°C and further reduce the drying time.

[0047] The present invention fully embodies the concept of circular economy and clean production, has good economic and environmental benefits, and has the following excellent effects:

[0048] (1) Using sewage sludge and livestock and poultry manure as the main raw materials, high-quality biochar is produced through synergistic processing, which completely eliminates antibiotics and pathogens in sewage sludge and livestock and poultry manure, and stabilizes heavy metals. Compared with pyrolysis of sludge alone, the biochar obtained has high content of effective elements such as carbon, nitrogen, phosphorus and potassium, and heavy metals are stabilized and can be used as a soil conditioner or adsorption material, which is green and environmentally friendly.

[0049] (2) The two difficult-to-treat wastes, sludge and biogas residue, are fully mixed to achieve complementary characteristics, and the red-hot biochar produced by the system itself is directly used for high-temperature conditioning and dehydration. This not only achieves the goal of high-efficiency filter press dehydration, but also realizes the coordinated treatment of sludge and biogas residue produced by the system, solving the problems of difficult biogas residue dehydration and high treatment costs, laying the foundation for zero emissions throughout the new process.

[0050] (3) The aerobic composting process is used to auto-dry and dehydrate livestock and poultry manure, which significantly reduces the dehydration cost of manure. In addition, the livestock and poultry manure is fully mixed with the conditioned and dehydrated sludge and biogas residue to significantly increase the organic matter content, laying a good raw material foundation for the subsequent carbonization and activation treatment to obtain high-quality biochar.

[0051] (4) Pyrolysis carbonization and activation are carried out in the same pyrolysis device. By controlling important parameters such as temperature, material and gas flow direction, and time, an integrated carbonization and activation process is achieved to prepare high-quality biochar with high porosity and rich surface functional groups. On the other hand, the online gasification process of water vapor and tar is realized to generate small molecular substances such as CO, H2, and CH4, thereby increasing the calorific value of the exported gas, avoiding the influence of water vapor on subsequent combustion, and achieving 100% self-sufficiency of system energy. At the same time, when the tar gas comes into contact with the carbonized material powder, the high molecular components are cracked to produce carbon film deposition on the surface or in the pores of the biochar, further improving the quality of the biochar.

[0052] (5) This technical method fully realizes the coordinated harmlessness, reduction and resource utilization of sludge and livestock and poultry manure, obtains high-quality biochar, liquid fertilizer and combustible gas, does not produce secondary pollution, achieves zero waste emissions, has a simple process control process, and has good social, economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of a device for coordinating treatment of sludge and livestock and poultry manure provided by the present invention;

[0054] Figure 2 This is a process flow chart of the method for coordinated treatment of sludge and livestock and poultry manure provided by the present invention.

[0055] Description of Reference Numerals

[0056] 1-sludge storage silo, 2-1# conveying device, 3-1# mixing device, 4-2# conveying device, 5-conditioning device, 6-3# conveying device, 7-mechanical filter press device, 8-4# conveying device, 9-2# mixing device, 10-5# conveying device, 11-pyrolysis device, 12-7# conveying device, 13-composting and drying device, 14-6# conveying device, 15-8# conveying device, 16-fermentation device, 17-10# conveying device, 18-combustion device, 19-9# conveying device, 20-cooling device, 21-2# fan, 22-11# conveying device, 23-product storage silo, 24-12# conveying device, 25-liquid fertilizer storage silo, 26-heat exchange device, 27-purification device, 28-1# fan, 29-chimney. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0058] The livestock and poultry manure includes all livestock and poultry manure, for example, pig manure, chicken manure, duck manure, cow manure, sheep manure, etc.

[0059] In the present invention, the pyrolysis temperature of the pyrolysis carbonization section is 300-500°C, for example, 300°C, 350°C, 400°C, 450°C, 500°C; the pyrolysis time is 10-30min, for example, 10min, 15min, 20min, 25min, 30min, etc. The pyrolysis temperature of the pyrolysis activation section is 900-1000°C, for example, 900°C, 910°C, 920°C, 930°C, 940°C, 950°C, 960°C, 970°C, 980°C, 990°C, 1000°C, etc.; the pyrolysis time is 30-50min, for example, 30min, 35min, 40min, 45min, 50min, etc.

[0060] like Figure 1As shown, the device for coordinated treatment of sludge and livestock and poultry manure provided by the present invention includes a sludge storage bin 1, a 1# conveying device 2, a 1# mixing device 3, a 2# conveying device 4, a conditioning device 5, a 3# conveying device 6, a mechanical filter press device 7, a 4# conveying device 8, a 2# mixing device 9, a 5# conveying device 10, a pyrolysis device 11, a 7# conveying device 12, a compost drying device 13, a 6# conveying device 14, an 8# conveying device 15, a fermentation device 16, a 9# conveying device 19, a cooling device 20, a 11# conveying device 22, a product storage bin 23, a 12# conveying device 24 and a liquid The fertilizer storage bin 25, the pyrolysis device 11 includes a pyrolysis carbonization section and a pyrolysis activation section that are interconnected; the outlet of the sludge storage bin 1 is connected to the inlet of the 1# conveying device 2, the outlet of the 1# conveying device 2 is connected to the sludge feeding port of the 1# mixing device 3, the outlet of the 1# mixing device 3 is connected to the inlet of the 2# conveying device 4, the outlet of the 2# conveying device 4 is connected to the inlet of the conditioning device 5, the outlet of the conditioning device 5 is connected to the inlet of the 3# conveying device 6, and the outlet of the 3# conveying device 6 is connected to the inlet of the mechanical filter press device 7; the solid phase outlet of the mechanical filter press device 7 is connected to the inlet of the 4# conveying device 8, and the 4# conveying device The outlet of the device 8 is connected to the inlet of the 2# mixing device 9, the outlet of the 2# mixing device 9 is connected to the inlet of the 5# conveying device 10, and the outlet of the 5# conveying device 10 is connected to the inlet of the pyrolysis carbonization section of the pyrolysis device 11; the liquid phase outlet of the mechanical filter press device 7 is connected to the inlet of the 8# conveying device 15, the outlet of the 8# conveying device 15 is connected to the inlet of the fermentation device 16, the sludge outlet of the fermentation device 16 is connected to the inlet of the 9# conveying device 19, the biogas outlet of the fermentation device 16 is connected to the inlet of the 12# conveying device 24, the outlet of the 12# conveying device 24 is connected to the inlet of the liquid fertilizer storage bin 25, and the outlet of the 9# conveying device The outlet of device 19 is connected to the sludge inlet of 1# mixing device 3; the first solid outlet of the pyrolysis activation section in the pyrolysis device 11 is connected to the inlet of the cooling device 20, the outlet of the cooling device 20 is connected to the inlet of 11# conveying device 22, the outlet of 11# conveying device 22 is connected to the inlet of the product storage bin 23, the second solid outlet of the pyrolysis activation section is connected to the inlet of 7# conveying device 12, the outlet of 7# conveying device 12 is connected to the inlet of the tempering device 5; the solid outlet of the compost drying device 13 is connected to the inlet of 6# conveying device 14, and the outlet of 6# conveying device 14 is connected to the inlet of 2# mixing device 9.

[0061] During operation, the sludge in the sludge storage bin 1 is transported into the 1# mixing device 3 via the 1# conveying device 2, mixed with the biogas residue transported by the 9# conveying device 19, and the mixture is transported into the conditioning device 5 via the 2# conveying device 4, thermally tempered by red-hot biochar, and the tempered mixture is transported into the mechanical filter press device 7 via the 3# conveying device 6 for solid-liquid separation by filtration; the filtrate phase is transported into the fermentation device 16 via the 8# conveying device 15 for anaerobic fermentation, the biogas residue produced by the anaerobic fermentation is transported into the 1# mixing device 3 via the 9# conveying device 19, and the biogas liquid produced by the anaerobic fermentation is transported into the 1# mixing device 3 via the 12# conveying device 24. The solid phase of the filtered material is transported to the 2# mixing device 9 via the 4# conveying device 8; the livestock and poultry manure is autothermally dried and dehydrated in the compost drying device 13, and then transported to the 2# mixing device 9 via the 6# conveying device 14 to be evenly mixed with the solid phase of the filtered material, and then transported to the pyrolysis device 11 via the 5# conveying device 10 for pyrolysis carbonization and activation treatment. A part of the obtained high-temperature red-hot biochar is transported to the tempering device 5 via the 7# conveying device 12 as a thermal tempering agent, and the other part is transported to the cooling device for cooling. The cooled biochar is transported to the product storage bin 19 via the 11# conveying device 22.

[0062] In a preferred embodiment of the present invention, the device for the coordinated treatment of sludge and livestock and poultry manure also includes a 10# conveying device 17, a combustion device 18 and a 2# fan 21, the gas phase outlet of the fermentation device 16 is connected to the inlet of the 10# conveying device 17, and the outlet of the 10# conveying device 17 is connected to the gas inlet of the combustion device 18; the odor outlet of the compost drying device 13 is connected to the cooling medium inlet of the cooling device 20, the heated odor outlet in the cooling device 20 is connected to the inlet of the 2# fan 21, and the outlet of the 2# fan 21 is connected to the air inlet of the combustion device 18. At this time, the biogas generated by the fermentation device 16 is transported by the 12# conveying device 24 and enters the liquid fertilizer storage bin, and is subsequently used as liquid fertilizer; the biogas generated by the fermentation device 16 is transported by the 10# conveying device 17 into the combustion device 18 for use as fuel. The odor generated by the compost is induced by the 2# fan 21, enters the cooling device 20 as an indirect cooling medium for the red-hot biochar and is heated, and then sent to the combustion device 18 for burning air, completely eliminating the odor generated by the manure treatment.

[0063] In a preferred embodiment of the present invention, the device for coordinated treatment of sludge and livestock and poultry manure also includes a heat exchange device 26, a purification device 27, a 1# fan 28 and a chimney 29, the hot flue gas outlet of the combustion device 18 is connected to the inlet of the pyrolysis device 11, and the flue gas exhaust outlet of the pyrolysis device 11 is connected to the flue gas exhaust inlet of the heat exchange device 26; the flue gas exhaust outlet of the heat exchange device 26 is connected to the inlet of the purification device 27, the outlet of the purification device 27 is connected to the inlet of the 1# fan 28, the outlet of the 1# fan 28 is connected to the chimney 29, the air outlet of the heat exchange device 26 is connected to the inlet of the 2# fan 21, and the outlet of the 2# fan 21 is connected to the air inlet of the combustion device 18. At this time, the flue gas tail gas generated after the high-temperature flue gas of the combustion device 18 enters the pyrolysis device 11 is sent to the heat exchange device 26 for heat exchange with the air and is cooled. The cooled flue gas tail gas is purified by the purification device 27 and then sucked into the chimney 29 by the 1# fan 28 for clean discharge; the air heated by the heat exchange device 26 is induced by the 2# fan 21 and sent to the combustion device 18 for the air required for combustion.

[0064] The present invention will be described in detail below through examples.

[0065] Example

[0066] like Figure 1 As shown, the device for coordinated treatment of sludge and livestock and poultry manure used in the embodiment includes a sludge storage bin 1, a 1# conveying device 2, a 1# mixing device 3, a 2# conveying device 4, a conditioning device 5, a 3# conveying device 6, a mechanical filter press device 7, a 4# conveying device 8, a 2# mixing device 9, a 5# conveying device 10, a pyrolysis device 11, a 7# conveying device 12, a compost drying device 13, a 6# conveying device 14, an 8# conveying device 15, a fermentation device 16, a 10# conveying device 17, a combustion device 18, a 9# conveying device 19, a cooling device 20, a 2# fan 21, a 11# conveying device 22, a product storage bin 23, a 12# conveying device 24, a liquid fertilizer storage bin 25, a heat exchange device 26, a purification device 27, a 1# fan 28 and a chimney 29, and the pyrolysis device 11 includes a pyrolysis carbonization section and a pyrolysis activation section that are interconnected.

[0067] The outlet of the sludge storage bin 1 is connected to the inlet of the 1# conveying device 2, the outlet of the 1# conveying device 2 is connected to the sludge feeding port of the 1# mixing device 3, the discharge port of the 1# mixing device 3 is connected to the inlet of the 2# conveying device 4, the outlet of the 2# conveying device 4 is connected to the inlet of the conditioning device 5, the outlet of the conditioning device 5 is connected to the inlet of the 3# conveying device 6, the outlet of the 3# conveying device 6 is connected to the inlet of the mechanical filter press device 7; the solid phase outlet of the mechanical filter press device 7 is connected to the inlet of the 4# conveying device 8, the outlet of the 4# conveying device 8 is connected to the inlet of the 2# mixing device 9, the outlet of the 2# mixing device 9 is connected to the inlet of the 5# conveying device 10 The outlet of the 5# conveying device 10 is connected to the inlet of the pyrolysis carbonization section of the pyrolysis device 11; the liquid phase outlet of the mechanical filter press device 7 is connected to the inlet of the 8# conveying device 15, the outlet of the 8# conveying device 15 is connected to the inlet of the fermentation device 16, the sludge outlet of the fermentation device 16 is connected to the inlet of the 9# conveying device 19, the sludge outlet of the fermentation device 16 is connected to the inlet of the 12# conveying device 24, and the outlet of the 12# conveying device 24 is connected to the inlet of the liquid fertilizer storage bin 25; the first solid outlet of the pyrolysis activation section in the pyrolysis device 11 is connected to the inlet of the cooling device 20, and the outlet of the cooling device 20 is connected to the inlet of the 11# conveying device 22 The inlet of the compost drying device 13 is connected, the outlet of the 11# conveying device 22 is connected to the inlet of the product storage bin 23, the second solid outlet of the pyrolysis activation section is connected to the inlet of the 7# conveying device 12, and the outlet of the 7# conveying device 12 is connected to the inlet of the conditioning device 5; the solid outlet of the compost drying device 13 is connected to the inlet of the 6# conveying device 14, and the outlet of the 6# conveying device 14 is connected to the inlet of the 2# mixing device 9, the odor outlet of the compost drying device 13 is connected to the cooling medium inlet of the cooling device 20, the heated odor outlet in the cooling device 20 is connected to the inlet of the 2# fan 21, and the outlet of the 2# fan 21 is connected to the air inlet of the combustion device 18; the fermentation device The gas phase outlet of device 16 is connected to the inlet of 10# conveying device 17, and the outlet of 10# conveying device 17 is connected to the gas inlet of combustion device 18; the hot flue gas outlet of combustion device 18 is connected to the inlet of pyrolysis device 11; the flue gas tail gas outlet of pyrolysis device 11 is connected to the flue gas tail gas inlet of heat exchange device 26, and the flue gas tail gas outlet of heat exchange device 26 is connected to the inlet of purification device 27, and the outlet of purification device 27 is connected to the inlet of 1# fan 28, and the outlet of 1# fan 28 is connected to chimney 29, and the air outlet of heat exchange device 26 is connected to the inlet of 2# fan 21, and the outlet of 2# fan 21 is connected to the air inlet of combustion device 18.

[0068] like Figure 1 and Figure 2As shown, the sludge in the sludge storage bin 1 is transported into the 1# mixing device 3 through the 1# conveying device 2, and mixed with the biogas residue transported by the 9# conveying device 19, the wet basis mass ratio of the sludge to the biogas residue is 60%:40%, and the obtained mixture is transported into the conditioning device 5 through the 2# conveying device 4, and hot conditioning is performed for 20 minutes with the addition of red hot biochar, and the addition amount of high temperature red hot biochar is 18% of the wet basis mass of the mixture of sludge and biogas residue; the tempered mixture is transported into the mechanical filter press device 7 through the 3# conveying device 6 for solid-liquid separation by filtration, and a filter press solid phase and a filter press liquid phase with a water content of ≤40% are obtained, and the filter press dehydration efficiency is increased by 20% compared with the case without conditioning; the filter press liquid phase is transported into the fermentation device 16 through the 8# conveying device 15 for anaerobic fermentation, the biogas residue produced by the anaerobic fermentation is transported into the 1# mixing device 3 through the 9# conveying device 19, and the biogas liquid produced by the anaerobic fermentation is transported into the liquid The solid waste storage bin 25 is placed in the filter press storage bin 25; the filter press solid phase is transported to the 2# mixing device 9 through the 4# conveying device 8; the livestock and poultry manure (pig manure) is autothermally dried and dehydrated to a moisture content of ≤30% by the compost drying device 13, and then transported to the 2# mixing device 9 through the 6# conveying device 14 to be uniformly mixed with the filter press solid phase (the addition amount of manure after aerobic composting autothermally dried is 20% of the mass of the filter press solid phase), and then transported to the pyrolysis device 11 through the 5# conveying device 10, firstly pyrolysis carbonization is carried out in the pyrolysis carbonization section (pyrolysis temperature is 400°C, time is 20min), and then pyrolysis activation is carried out in the pyrolysis activation section (pyrolysis temperature is 950°C, time is 40min), a part of the obtained red-hot biochar is transported to the tempering device 5 through the 7# conveying device 12 as a thermal tempering agent, and the other part is connected to the cooling device for cooling, and the cooled biochar is transported to the product storage bin 19 through the 11# conveying device 22.

[0069] The biogas produced by the fermentation device 16 is transported by the 12# transport device 24 to the liquid fertilizer storage bin and used as liquid fertilizer later; the biogas produced by the fermentation device 16 is transported by the 10# transport device 17 to the combustion device 18 for use as fuel. The odor produced by the compost is drawn by the 2# fan 21, enters the cooling device 20 as an indirect cooling medium for the red-hot biochar and is heated, and then is sent to the combustion device 18 for combustion air, completely eliminating the odor produced by the manure treatment.

[0070] The high-temperature flue gas from the combustion device 18 enters the pyrolysis device 11 as a pyrolysis energy source, and the flue gas exhaust enters the heat exchange device 26 to exchange heat with the air and be cooled. The cooled flue gas exhaust is purified by the purification device 27 and then sucked into the chimney 29 by the 1# fan 28 for clean discharge; the air heated by the heat exchange device 26 is induced by the 2# fan 21 and sent into the combustion device 18 for the air required for combustion.

[0071] The method provided in this embodiment can achieve complete digestion of bacteria, microorganisms and antibiotic pollutants, and can promote the solidification and stabilization of heavy metals Cr, As, Pb and Cd. The heavy metal leaching in the obtained biochar meets the requirements of the hazardous waste identification standard GB5085.3-2007 and the agricultural mud pollutant control standard (GB4284-2018), without any ecological safety risks. In addition, the mass fraction of (nitrogen + phosphorus pentoxide + potassium oxide) in the obtained biochar (on a drying basis) is ≥5.0%, the surface functional groups are rich, the porosity is improved, and the specific surface area is>60m 2 / g, can be used as soil conditioner or adsorbent, green and environmentally friendly.

[0072] The biochar was mixed with ordinary organic soil as planting soil, and cucumbers were planted in a modern greenhouse. Cucumber seeds were surface disinfected with 10% sodium hypochlorite solution for 10 minutes, then treated in 55°C warm water for 20 minutes, and then soaked in 30°C warm water for 8 hours, and then placed in a constant temperature box at 28°C for germination, with a humidity of 80% and kept in the dark until germination. After the seeds germinated, plump and uniformly germinated seeds were selected and sown in a planting bag containing 35kg of substrate. When the biochar addition amount was 10wt%, the plant height, chlorophyll content, dry weight of roots, stems, leaves and fruits of cucumbers increased by 6.46%, 6.64%, 41.95%, 18.36%, 35.32% and 40.21% respectively compared with the control group (planting soil was ordinary organic soil). It can be seen that the obtained biochar can improve the fertility, water holding capacity, porosity and biological activity of the substrate.

[0073] In summary, the method provided by the present invention can fully realize the coordinated harmlessness, reduction and resource utilization of sludge and livestock and poultry manure, does not produce secondary pollution, achieves zero discharge of waste and wastewater, has a simple process control process, and has good social, economic and environmental benefits.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A method for the coordinated treatment of sludge and livestock and poultry manure, characterized in that: The method includes: S1, mixing the sludge and the biogas residue evenly, adding the high-temperature red-hot biochar to the obtained mixture and stirring and mixing evenly to perform thermal conditioning, and then dehydrating by mechanical filter pressing to obtain a filter press solid phase and a filter press liquid phase; S2, subjecting the filtrate phase to anaerobic fermentation, returning the biogas residue produced by the anaerobic fermentation to step S1 for mixing with the sludge for conditioning, and directly utilizing the biogas liquid produced by the anaerobic fermentation as liquid fertilizer; S3, aerobic composting and autothermal drying of livestock and poultry manure, the manure after aerobic composting and autothermal drying is evenly mixed with the filter press solid phase in step S1 to form a pyrolysis material, which is sent to a pyrolysis furnace for pyrolysis treatment. The pyrolysis furnace includes a pyrolysis carbonization section and a pyrolysis activation section that are interconnected. The pyrolysis material is first sent to the pyrolysis carbonization section for pyrolysis carbonization at 300-500°C for 10-30 minutes, and then the pyrolysis carbonization product is sent to the pyrolysis activation section for pyrolysis activation at 900-1000°C for 30-50 minutes. The pyrolysis gas generated by the pyrolysis activation is used as fuel together with the biogas generated by anaerobic fermentation in step S2. A part of the high-temperature red-hot biochar generated by the pyrolysis activation is returned to step S1 for thermal conditioning, and the other part is cooled to obtain high-quality biochar.

2. The method for co-processing sludge and livestock and poultry manure according to claim 1, characterized in that: In step S1, the wet basis mass ratio of the sludge to the biogas residue is (50% to 70%): (50% to 30%); the addition amount of the high-temperature red-hot biochar is 15% to 20% of the wet basis mass of the sludge and biogas residue mixture; the thermal conditioning time is 15 to 30 minutes; the moisture content of the filter press solid phase obtained after the mechanical filter press dehydration is ≤40%.

3. The method for co-processing sludge and livestock and poultry manure according to claim 1, characterized in that: In step S2, the carbon-nitrogen ratio used in the anaerobic fermentation is (10-40):1, and the pH value is 5.5-7.

5.

4. The method for co-processing sludge and livestock and poultry manure according to claim 1, characterized in that: In step S3, the moisture content of the livestock and poultry manure after aerobic composting and autothermal drying is ≤30%; the amount of the manure added after aerobic composting and autothermal drying is 10% to 30% of the mass of the solid phase of the filter press.

5. The method for co-processing sludge and livestock and poultry manure according to any one of claims 1 to 4, characterized in that: In step S3, the high-temperature red-hot biochar is indirectly cooled by air to become high-quality biochar, and the odor generated by the autothermal drying of the aerobic composting of livestock and poultry manure is exchanged with the flue gas exhaust generated by pyrolysis and used together with the air heated by the high-temperature red-hot biochar as the air required for fuel combustion.

6. The method for co-processing sludge and livestock and poultry manure according to claim 5, characterized in that: The method also includes using high-quality biochar as a soil conditioner or adsorption material; and / or purifying the flue gas exhaust after heat exchange to achieve standard emission.

7. A device for the coordinated treatment of sludge and livestock and poultry manure, characterized in that: The device comprises a sludge storage bin (1), a No. 1 conveying device (2), a No. 1 mixing device (3), a No. 2 conveying device (4), a conditioning device (5), a No. 3 conveying device (6), a mechanical filter press device (7), a No. 4 conveying device (8), a No. 2 mixing device (9), a No. 5 conveying device (10), a pyrolysis device (11), a No. 7 conveying device (12), a compost drying device (13), a No. 6 conveying device (14), a No. 8 conveying device (15), a fermentation device (16), a No. 9 conveying device (19), a cooling device (20), a No. 11 conveying device (22), a product storage bin (23), a No. 12 conveying device (24) and a liquid fertilizer storage bin (25), wherein the pyrolysis device (11) comprises a pyrolysis carbonization section and a pyrolysis activation section which are interconnected; The outlet of the sludge storage bin (1) is connected to the inlet of the No. 1 conveying device (2), the outlet of the No. 1 conveying device (2) is connected to the sludge feed port of the No. 1 mixing device (3), the discharge port of the No. 1 mixing device (3) is connected to the inlet of the No. 2 conveying device (4), the outlet of the No. 2 conveying device (4) is connected to the inlet of the conditioning device (5), the outlet of the conditioning device (5) is connected to the inlet of the No. 3 conveying device (6), the outlet of the No. 3 conveying device (6) is connected to the inlet of the mechanical filter press device (7); the solid phase outlet of the mechanical filter press device (7) is connected to the inlet of the No. 4 conveying device (8), the outlet of the No. 4 conveying device (8) is connected to the inlet of the No. 2 mixing device (9), the outlet of the No. 2 mixing device (9) is connected to the inlet of the No. 5 conveying device (10), the outlet of the No. 5 conveying device (10) is connected to the inlet of the pyrolysis carbonization section of the pyrolysis device (11); the liquid phase outlet of the mechanical filter press device (7) is connected to the inlet of the No. 8 conveying device (15), the outlet of the No. 8 conveying device (15) is connected to the fermentation device (16). The inlet of the pyrolysis device (11) is connected to the inlet of the 9# conveying device (19), the sludge outlet of the fermentation device (16) is connected to the inlet of the 12# conveying device (24), the outlet of the 12# conveying device (24) is connected to the inlet of the liquid fertilizer storage bin (25), and the outlet of the 9# conveying device (19) is connected to the sludge inlet of the 1# mixing device (3); the first solid outlet of the pyrolysis activation section in the pyrolysis device (11) is connected to the inlet of the cooling device (20), the outlet of the cooling device (20) is connected to the inlet of the 11# conveying device (22), the outlet of the 11# conveying device (22) is connected to the inlet of the product storage bin (23), the second solid outlet of the pyrolysis activation section is connected to the inlet of the 7# conveying device (12), and the outlet of the 7# conveying device (12) is connected to the inlet of the conditioning device (5); the solid outlet of the compost drying device (13) is connected to the inlet of the 6# conveying device (14), and the outlet of the 6# conveying device (14) is connected to the inlet of the 2# mixing device (9).

8. The device for co-processing sludge and livestock and poultry manure according to claim 7, characterized in that: The device also includes a 10# conveying device (17), a combustion device (18) and a 2# fan (21); the gas phase outlet of the fermentation device (16) is connected to the inlet of the 10# conveying device (17), and the outlet of the 10# conveying device (17) is connected to the gas inlet of the combustion device (18); the odor outlet of the compost drying device (13) is connected to the cooling medium inlet of the cooling device (20), the heated odor outlet in the cooling device (20) is connected to the inlet of the 2# fan (21), and the outlet of the 2# fan (21) is connected to the air inlet of the combustion device (18).

9. The device for co-processing sludge and livestock and poultry manure according to claim 8, characterized in that: The device further comprises a heat exchange device (26), a purification device (27), a No. 1 fan (28) and a chimney (29); the hot flue gas outlet of the combustion device (18) is connected to the inlet of the pyrolysis device (11); the flue gas outlet of the pyrolysis device (11) is connected to the flue gas inlet of the heat exchange device (26); the flue gas outlet of the heat exchange device (26) is connected to the inlet of the purification device (27); the outlet of the purification device (27) is connected to the inlet of the No. 1 fan (28); the outlet of the No. 1 fan (28) is connected to the chimney (29); the air outlet of the heat exchange device (26) is connected to the inlet of the No. 2 fan (21); and the outlet of the No. 2 fan (21) is connected to the air inlet of the combustion device (18).

10. The device for co-processing sludge and livestock and poultry manure according to claim 9, characterized in that: The sludge storage bin (1) is a concrete storage bin; The 1# conveying device (2), 2# conveying device (4), 3# conveying device (6) and 9# conveying device (19) are mud pumps; the 4# conveying device (8), 5# conveying device (10) and 6# conveying device (14) are screw conveyors, belt conveyors or scraper conveyors; the 7# conveying device (12) is a high-temperature chain conveyor or a high-temperature resistant inclined chute; the 8# conveying device (15) and 12# conveying device (24) are water pumps; the 10# conveying device (17) is a gas blower; the 11# conveying device (22) is a pneumatic conveyor, a screw conveyor, a belt conveyor or a scraper conveyor; The 1# mixing device (3) is an open mixing tank with a stirring device; The conditioning device (5) is a closed mixing tank with a stirring device; The mechanical filter press device (7) is a plate and frame filter press or a high-pressure belt dehydrator; The second mixing device (9) is a mixing mill, a double-shaft mixer, a plowshare mixer or a ribbon mixer; The pyrolysis device (11) is a two-stage indirect heating drum pyrolysis furnace; The compost drying device (13) is a conventional composting system; The fermentation device (16) is a conventional anaerobic fermentation device; The combustion device (18) is a coal gas or natural gas combustion furnace; The cooling device (20) is an air-indirect cooling drum; The 2# fan (21) is an induced draft air fan; The product storage bin (23) and the liquid fertilizer storage bin (25) are ordinary steel bins; The heat exchange device (26) is a common flue gas indirect heat exchanger; The purification device (27) is a common flue gas and tail gas purification system; The 1# fan (28) is a flue gas induced draft fan; The chimney (29) is a conventional steel chimney or a concrete chimney.

Images