CN115232741A - Agricultural and forestry waste recyclingSynergistic CO 2 Device and method for fixing and upgrading methane - Google Patents
Agricultural and forestry waste recyclingSynergistic CO 2 Device and method for fixing and upgrading methane Download PDFInfo
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Abstract
The invention discloses a resource synergistic CO for agricultural and forestry wastes 2 A device and a method for fixing and improving methane quality. The device comprises a feeding device, an anaerobic reactor, a methane collecting device and a water outlet device, wherein the internal space of the anaerobic reactor is divided into an upper acidogenic fermentation area and a lower anaerobic digestion methanogenic area by a partition plate, and a gas-liquid separation valve is arranged on the partition plate; the methane collecting device comprises a methane collecting pipe, a methane collecting tank and a methane circulating pipe; and a water outlet of the anaerobic digestion methanogenesis area is communicated with the water outlet device. The invention enables the marsh gas to enter the acid-producing fermentation area through the gas stripping action by arranging the gas-liquid separation valve, simultaneously prevents the feed liquid of the acid-producing fermentation area from entering the anaerobic digestion methane-producing area from the gas-liquid separation valve, and realizes CO generation of the marsh gas in the acid-producing fermentation area 2 Biological fixation of (2) reduces CO 2 Content, i.e. the purity of the biogas is improved, and CO is realized by circulating the biogas 2 Further fixation of the biogas slurry, and the heat value and application value of biogas combustion are improved.
Description
Technical Field
The invention belongs to the technical field of anaerobic digestion of solid wastes, and particularly relates to recycling synergistic CO of agricultural and forestry wastes 2 A device and a method for fixing and improving methane quality.
Background
With the development of society, people depend on non-renewable fossil energy such as petroleum, coal, natural gas and the like and CO in the atmosphere 2 Due to the increase of the content, the problems of energy exhaustion, pollution aggravation, greenhouse effect and the like are faced, the energy crisis is relieved, and the development of renewable clean energy and environmental protection technology is promoted. The biogas generated by anaerobic digestion is an ideal clean energy source, during the anaerobic digestion process, microorganisms help to convert complex organic raw materials or wastes into biomass and biogas, and can realize resource conversion and organic waste treatment at the same time, but the biogas generated by anaerobic digestion contains 30-50% of CO 2 The combustion heat value and the utilization value of the methane are reduced, and the natural gas pipeline is corroded to a certain degree, so that the methane needs to be upgraded and then utilized.
The lignocellulose biomass is one of the most abundant wastes produced on the earth at present, and mainly comprises cellulose, hemicellulose and lignin, generally speaking, the content of each component is respectively 30-50 wt%, 15-40 wt% and 10-30 wt%, wherein the cellulose and the hemicellulose can be utilized by microorganisms for anaerobic digestion to produce biogas after being hydrolyzed. The agricultural and forestry wastes belong to lignocellulose biomass, have rich yield and high potential value, and the anaerobic digestion of the agricultural and forestry wastes as substrates can not only carry out green treatment on the agricultural and forestry wastes, but also obtain renewable energy sources so as to reduce the use of fossil energy sources.
However, due to the structural characteristics of the agricultural and forestry wastes, the agricultural and forestry wastes are difficult to degrade by the traditional anaerobic digestion, and the recycling efficiency is low. The lignin component is a semi-random three-dimensional aromatic polymer formed by connecting phenyl propane subunits through various ethers and carbon-carbon bonds, is difficult to degrade by microorganisms, and under the condition of high-load substrate, if a traditional integrated anaerobic digestion reactor is adopted to treat the agriculture and forestry wastes, firstly, the reaction system is easy to acidify so as to inhibit the activity of methanogens, and secondly, most of the undegraded components exist in the form of biogas residues due to the characteristic of difficult degradation of the agriculture and forestry wastes, so that the slag discharge frequency is high. Anaerobic sludge is discharged along with the anaerobic sludge in the deslagging process, the generation cycle of methanogens is longer than that of most bacteria, short-cycle discharge of the anaerobic sludge can reduce the abundance of the methanogens in the system, so that the methane production performance of the anaerobic system is reduced, and the anaerobic system cannot stably operate, so that the problems that the system is easy to acidify under the condition of high-load substrates and the methane production performance is easy to reduce due to sludge discharge can be solved by adopting an acidogenic fermentation and methane production zoning mode. In addition, the lignin contains a large amount of functional groups of different types and CO exists 2 Adsorption sites, and therefore a certain amount of CO 2 Fixing potential, namely placing the acid-producing fermentation area above the methane-producing area, wherein the methane generated in the methane-producing area can directly pass through the acid-producing fermentation area under the action of gas stripping, and can be used for treating CO in the methane under the action of microorganisms and agricultural and forestry wastes 2 Fixing to realize methane quality improvement.
CN207046943U reports a combinable two-phase integrated type anaerobic reactor for planting and feeding waste mixed raw materials, wherein a hydrolysis acidification unit and an anaerobic sludge unit are separated, the hydrolysis acidification unit is arranged on the lower layer, the anaerobic sludge unit is arranged on the upper layer, and an isolation is arranged between the two unitsThe tray is embedded with a check valve in the center, the check valve enables the water flow direction to be from the lower hydrolysis acidification unit to the upper anaerobic sludge unit, and the tray has the characteristics of few structures, small floor area and simple attached facilities and equipment on the premise of separating hydrolysis acidification from methane production. However, the biogas generated by anaerobic digestion in this patent does not re-enter the hydrolytic acidification zone and cannot utilize substrates and microorganisms for CO 2 Fixing is carried out, and the heat value of the methane is improved.
The biogas generated by the existing anaerobic digestion reactor mostly needs to be subsequently operated to remove CO 2 The main separation technologies include pressure swing adsorption, water washing, chemical absorption and membrane separation, which have the problems of extra chemical reagents, high cost, environmental pollution, complex operation, etc. Therefore, a method for fixing CO by using microorganisms and reaction substrates is designed 2 The anaerobic reaction device and the method have important significance for realizing the quality improvement of the methane and being beneficial to improving the stability of the reactor.
Disclosure of Invention
The invention aims to provide a synergistic CO for recycling agricultural and forestry wastes 2 The device adopts a gas-liquid separation valve to make the marsh gas generated by a methane generating area enter an acid-producing fermentation area, and simultaneously prevents feed liquid of the acid-producing fermentation area from entering an anaerobic digestion methane generating area, and CO in the marsh gas is subjected to the action of agricultural and forestry wastes and microorganisms in the acid-producing fermentation area 2 And (6) fixing. In addition, by circulating the biogas, CO is realized 2 Further fixing of (2). The invention realizes resource conversion, improves the quality of the methane, reduces carbon emission and has wider application prospect.
In order to achieve the purpose, the invention adopts the following technical scheme: agricultural and forestry waste recycling synergistic CO 2 The device for fixing and improving the quality of the biogas comprises:
a feeding device;
the anaerobic reactor is characterized in that the inner space of the anaerobic reactor is divided into an acid-producing fermentation area at the upper layer and an anaerobic digestion methane-producing area at the lower layer by a partition plate, and a gas-liquid separation valve is arranged on the partition plate and is used for enabling methane generated by the anaerobic digestion methane-producing area to enter the acid-producing fermentation area and preventing feed liquid of the acid-producing fermentation area from entering the anaerobic digestion methane-producing area; the lower end of the side wall of the acid-producing fermentation area is provided with a water inlet, the upper end of the side wall is provided with a water outlet, the top of the side wall is provided with a methane gas inlet and a methane gas outlet, and the feeding device is communicated with the water inlet; a sludge bed area is arranged at the lower part in the anaerobic digestion methanogenesis area, a water inlet is formed in the side wall of the sludge bed area, a water outlet of the acidogenic fermentation area is communicated with the water inlet of the anaerobic digestion methanogenesis area, and a water outlet is formed in the upper end of the side wall of the anaerobic digestion methanogenesis area;
the biogas collecting device comprises a biogas collecting pipe, a biogas collecting tank and a biogas circulating pipe, wherein the biogas collecting pipe is connected to the biogas collecting tank through the biogas outlet, the biogas collecting pipe is positioned above the liquid level of the acid-producing fermentation area, and the biogas circulating pipe extends into the bottom of the acid-producing fermentation area through the biogas inlet;
and the water outlet of the anaerobic digestion methanogenesis area is communicated with the water outlet device.
The agricultural and forestry waste recycling synergistic CO 2 In the device for fixing and improving the quality of the biogas, preferably, a water outlet of the acid-producing fermentation area is provided with an isolation device to prevent solid substrates and microorganisms in the acid-producing fermentation area from entering the anaerobic digestion methane-producing area and losing. The isolation means may be a screen or membrane having a pore size smaller than the size of the bacteria.
The agricultural and forestry waste recycling synergistic CO 2 In the device for fixing and upgrading methane, preferably, the gas-liquid separation valve comprises a vent pipe and an outer cover which is covered outside the vent pipe, and the vent pipe penetrates through the partition plate and extends to the upper part of the partition plate; the bottom opening of dustcoat and with the breather pipe with all be equipped with the interval between the baffle, wherein, the highest point of breather pipe is higher than the lowest point of dustcoat, the marsh gas that anaerobic digestion methane production district produced loops through the air stripping action the breather pipe, the dustcoat with the gap entering between the breather pipe the acid production fermentation district.
The above agricultural and forestry waste resourcesChemical synergistic CO 2 In the device for fixing and methane upgrading, preferably, the sludge bed area accounts for one third of the anaerobic digestion methane-producing area;
the bottom of the sludge bed zone is provided with a water distribution device, and a water inlet of the anaerobic digestion methane production zone is communicated with the water distribution device.
The agricultural and forestry waste recycling synergistic CO 2 In the device for fixing and improving the quality of the biogas, preferably, a heat-preservation water jacket is wrapped outside the anaerobic reactor and is connected with a hot water circulator.
The agricultural and forestry waste recycling synergistic CO 2 In the device for fixing and improving the quality of the biogas, preferably, a plurality of slag discharging ports are arranged on the side wall of the bottom end of the acid-producing fermentation area;
the slag discharge port comprises a first slag discharge port and a second slag discharge port which are positioned at different heights, and the first slag discharge port is lower than the bottom of the biogas circulating pipe;
the first slag discharge port comprises a plurality of slag discharge ports which are distributed at the same height at equal intervals;
each slag discharging port is connected with a slag discharging pipe.
The agricultural and forestry waste recycling synergistic CO 2 In the device for fixing and improving the quality of the biogas, preferably, the feeding device comprises a feeding tank, a feeding pipe and a feeding pump, wherein a stirring paddle is arranged in the feeding tank, the stirring paddle is connected with a stirring machine, and the feeding tank is communicated with a water inlet of the acid-producing fermentation area through the feeding pipe;
the water outlet device comprises a water outlet pool and a water outlet pipe, a valve is arranged on the water outlet pipe, and a water outlet of the anaerobic digestion methanogenesis area is communicated with the water outlet pool through the water outlet pipe.
The agricultural and forestry waste is recycled to cooperate with CO 2 In the device for fixing and upgrading methane, preferably, valves are respectively arranged on the methane collecting pipe and the methane circulating pipe;
the top of the biogas collecting tank is connected with a gas pipe and a gas meter.
The invention provides a synergistic agriculture and forestry waste recycling method by utilizing the device of any one of the aboveO 2 The method for fixing and upgrading the methane comprises the following steps:
s1, mixing smashed and sieved agricultural and forestry wastes with water, introducing the mixture into an acid-producing fermentation area, inoculating microorganisms to carry out acid-producing fermentation, and discharging material residues through a residue discharge port at regular intervals;
s2, adding anaerobic granular sludge into the sludge bed area, allowing feed liquid flowing out of the acidogenic fermentation area to enter the sludge bed area for anaerobic digestion, allowing effluent to enter the effluent device, and allowing biogas to enter the acidogenic fermentation area through the gas-liquid separation valve under the action of gas stripping;
s3, the agriculture and forestry wastes in the acid-producing fermentation area act on CO in the biogas under the action of the microorganisms 2 Fixing, and feeding the upgraded methane into the methane collection tank;
s4, enabling the marsh gas in the marsh gas collecting tank to enter the acid-producing fermentation area again through the marsh gas circulating pipe, and enabling CO in the marsh gas to be in the acid-producing fermentation area 2 Is further fixed.
The agricultural and forestry waste recycling synergistic CO 2 In the method for fixing and improving the quality of the biogas, preferably, the agricultural and forestry waste is one or more of straws, lawn grass, garden trimmed leaves and the like;
the agricultural and forestry wastes are mixed with water and fed in a semi-continuous flow mode;
the microorganism is anaerobic fermentation mixed flora domesticated by a methanogenesis inhibitor and addedClostridium cellulolyticum(Clostridium cellulolyticum) species;
the anaerobic fermentation mixed flora domesticated by the methanogenesis inhibitor has no methanogenesis function.
In the acid-producing fermentation step, different solid-liquid retention times are set as required;
and starting an acid-producing fermentation area water outlet pump according to the hydraulic retention time to enable the feed liquid flowing out of the acid-producing fermentation area to enter the sludge bed area for anaerobic digestion.
The agricultural and forestry waste recycling synergistic CO 2 In the method for fixing and upgrading methane, the temperature of the heat-insulating water jacket is preferably 35-37 ℃.
The invention has the following beneficial effects:
(1) The invention prevents the system from rapid acidification under the condition of high-load substrate by separating the acidogenic fermentation area from the anaerobic digestion methanogenesis area, avoids the microorganism loss of the acidogenic fermentation area through the water outlet pipe by arranging the isolation device (screen or membrane), and effectively avoids the reduction of the abundance of methanogenic bacteria because the reaction substrates are all in the acidogenic fermentation area and the methanogenesis area does not need to discharge mud, thereby ensuring that the reactor maintains better methanogenesis performance and improving the stability of the anaerobic reactor.
(2) The invention discharges the reaction material slag in the acid-producing fermentation area regularly through the arrangement of the slag discharge port, thereby preventing the reduction of the effective volume and the working efficiency of the reactor.
(3) The invention can increase mass transfer, accelerate reaction and further make CO in the marsh gas by the circulation of the marsh gas through the arrangement of the marsh gas circulation system, and the circulation of the marsh gas can make the feed liquid in the fermentation acid-producing area use the stirring effect of the gas to increase the mass transfer and accelerate the reaction 2 Is fixed.
(4) The invention has the advantages that the gas-liquid separation valve is arranged, so that the methane enters the acid-producing fermentation area under the gas stripping action, simultaneously, the feed liquid in the acid-producing fermentation area is prevented from entering the anaerobic digestion methane-producing area from the gas-liquid separation valve, and the CO is realized in the fermentation acid-producing area 2 The biological fixation reduces CO in the marsh gas 2 The content, namely the purity of the biogas is improved, and further the combustion heat value and application value of the biogas are improved; inoculating anaerobic fermentation mixed flora (without methanogenesis function) domesticated by methanogenesis inhibitor and capable of producing cellulase in acidogenesis fermentation areaClostridium cellulolyticumThe strain improves the hydrolysis and acid production efficiency of the agriculture and forestry wastes and CO 2 The efficiency is fixed.
(5) The invention fully utilizes the marsh gas generated in the anaerobic methane generating area, reduces CO in the marsh gas at lower cost under the condition of not needing additional chemical reagents and separation membranes through the gas stripping action and the composition structure characteristics of the agricultural and forestry wastes 2 The content of the methane improves the combustion heat value and the utilization rate of the methane.
(6) The invention has simple structure and convenient operation, is beneficial to the reclamation of agricultural and forestry wastes and the generation of clean energy, and has good application prospect under the background of carbon neutralization and carbon peak reaching.
Drawings
FIG. 1 shows the synergistic effect of recycling of agricultural and forestry wastes in CO 2 The structure of the device for fixing and upgrading the methane is shown schematically.
The respective labels in FIG. 1 are as follows:
100-a feeding device; 110-an anaerobic reactor; 120-a biogas collection device; 130-a water outlet device;
101-a feed tank; 102-a feed pipe; 103-a feed pump; 104-stirring paddle; 105-a blender;
111-an acidogenic fermentation zone; 112-anaerobic digestion methanogenesis zone; 113-a gas-liquid separation valve; 114-heat preservation water jacket;
1111-water inlet of acid-producing fermentation area; 1112-acid-producing fermentation area water outlet; 1113-water outlet pipe of acid-producing fermentation area; 1114-water pump for acid-producing fermentation zone; 1115-biogas inlet and outlet ports; 1116-a first slag discharge port; 1117-a second slag discharge hole; 1118-a slag discharge pipe;
1121-sludge bed zone; 1122-anaerobic digestion methanogenesis zone water inlet; 1123-water outlet of anaerobic digestion methanogenesis area; 1124-water distribution device;
121-a biogas collecting pipe; 122-a biogas collection tank; 123-biogas circulating pipe; 124-biogas collecting pipe valve; 125-biogas circulating pipe valve; 126-gas delivery pipe; 127-gas meter;
131-a water outlet pool; 132-a water outlet pipe; 133-water outlet valve.
Fig. 2 is a schematic structural view of the gas-liquid separation valve.
The respective labels in fig. 2 are as follows:
200-a breather pipe; 201-housing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated, are not intended to imply any particular meaning or importance to the contrary.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "communicate", "arrange", "provide", "connect" are to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following description combines the drawings to provide a synergistic CO for recycling agricultural and forestry wastes 2 The fixing and methane upgrading device is explained in detail.
As shown in figure 1, the agricultural and forestry waste resource CO-generation method of the invention 2 The device for fixing and improving the quality of the marsh gas comprises a feeding device, an anaerobic reactor, a marsh gas collecting device and a water outlet device;
the feeding device 100 comprises a feeding tank 101, a feeding pipe 102 and a feeding pump 103, wherein a stirring paddle 104 is arranged in the feeding tank 101, the stirring paddle 104 is connected with a stirrer 105, the feeding tank 101 is communicated with a water inlet 1111 of an acidogenic fermentation area 111 through the feeding pipe 102, and the feeding is carried out through the feeding pump 103;
the internal space of the anaerobic reactor 110 is divided into an upper acidogenic fermentation zone 111 and a lower anaerobic digestion zone by a partition plateThe connecting part, namely the partition board, of the methanogenic region 112, the acidogenic fermentation region 111 and the anaerobic digestion methanogenic region 112 is provided with a gas-liquid separation valve 113, so that methane generated by the anaerobic digestion methanogenic region 112 enters the acidogenic fermentation region 111, feed liquid of the acidogenic fermentation region 111 is prevented from entering the anaerobic digestion methanogenic region 112 through the gas-liquid separation valve 113, and the acidogenic fermentation region 111 and the anaerobic digestion methanogenic region 112 can be connected through a flange. The effluent of the acidogenic fermentation zone 111 is dissolved with a certain amount of CO due to hydrolytic fermentation of the substrate 2 The gas produced in the anaerobic digestion methanogenesis zone 112 also contains CO 2 Through the gas stripping action, the gas in the anaerobic digestion methane-producing area 112 passes through the gas-liquid separation valve 113 to enter the acid-producing fermentation area 111, and CO in the gas is treated by utilizing reaction substrates and microorganisms 2 And fixing, and feeding the upgraded methane into a methane collection tank 122. The anaerobic reactor 110, namely the acidogenic fermentation zone 111 and the anaerobic digestion methanogenic zone 112 are externally wrapped with a heat-insulating water jacket 114, and the heat-insulating water jacket 114 is connected with a hot water circulator so as to maintain the temperature of the reactor at 35-37 ℃;
wherein, the lower end of the side wall of the acid-producing fermentation area 111 is provided with an acid-producing fermentation area water inlet 1111, the upper end of the side wall is provided with an acid-producing fermentation area water outlet 1112, the acid-producing fermentation area water outlet 1112 is provided with an isolation screen (the aperture is smaller than 0.45 μm to prevent solid substrates and microorganisms in the acid-producing fermentation area 111 from entering the anaerobic digestion methane-producing area 112 to be lost, the acid-producing fermentation area water outlet 1112 is communicated with the anaerobic digestion methane-producing area water inlet 1122 through an acid-producing fermentation area water outlet pipe 1113 and an acid-producing fermentation area water outlet pump 1114, the top of the acid-producing fermentation area 111 is provided with a methane gas inlet and a methane gas outlet, the methane gas inlet and the methane gas outlet can be separately arranged and can share one opening, namely the methane gas inlet and outlet 1115, the side wall at the bottom end of the acid-producing fermentation area 111 is provided with a plurality of slag discharge ports, the slag discharge ports comprise a first slag discharge port and a second slag discharge port 1117 which are positioned at different heights, the first slag discharge port is lower than the bottom end of the methane circulation pipe 123, the first slag discharge port 1116 is provided with 4 slag discharge ports which are distributed at the same height and can be used for measuring and can be regularly connected with each slag discharge pipe 1118, and each slag discharge pipe for measuring and each slag discharge pipe, and each slag discharge pipe can be used for measuring and each slag discharge, and each slag discharge pipe for each slag discharge pipe123 extends into the bottom of the acid-producing fermentation area 111 through a marsh gas inlet and outlet port 1115 to ensure that CO in the marsh gas 2 Is further fixed;
wherein, a sludge bed region 1121 is arranged at the lower part in the anaerobic digestion methane-producing region 112, the sludge bed region 1121 accounts for one third of the anaerobic digestion methane-producing region 112, namely the sludge bed region 1121 is arranged below one third of the height of the bottom of the anaerobic digestion methane-producing region 112, the side wall of the sludge bed region 1121 is provided with an anaerobic digestion methane-producing region water inlet 1122, an acid-producing fermentation region water outlet 1112 is communicated with the anaerobic digestion methane-producing region water inlet 1122, the upper end of the side wall of the anaerobic digestion methane-producing region 112 is provided with an anaerobic digestion methane-producing region water outlet 1123, the anaerobic digestion methane-producing region water outlet 1123 is communicated with a water outlet device 130, effluent is sent into a water outlet pool 131 through a water outlet pipe 132, the bottom of the sludge bed region 1121 is provided with a water distribution device 1124, the anaerobic digestion methane-producing region water inlet 1122 is communicated with the water distribution device 1124, feed liquid in the acid-producing fermentation region 111 is conveyed to the sludge bed region 1121 through an acid-producing fermentation region water outlet pipe 1113 through an acid-producing fermentation region water outlet pump 1114, and water is uniformly distributed through the water distribution device 1124;
the biogas collecting device 120 comprises a biogas collecting pipe 121, a biogas collecting tank 122 and a biogas circulating pipe 123; the biogas collecting pipe 121 is connected to the biogas collecting tank 122 through a biogas inlet and outlet 1115, the biogas collecting pipe 121 is positioned above the liquid level of the acid-producing fermentation area 111, the biogas circulating pipe 123 extends into the bottom of the acid-producing fermentation area 111 through the biogas inlet and outlet 1115, a biogas collecting pipe valve 124 is arranged on the biogas collecting pipe 121, a biogas circulating pipe valve 125 is arranged on the biogas circulating pipe 123, and a gas pipe 126 and a gas meter 127 are connected to the top of the biogas collecting tank 122;
the water outlet device 130 comprises a water outlet tank 131 and a water outlet pipe 132, the water outlet pipe 132 is provided with a water outlet valve 133, and a water outlet 1123 of the anaerobic digestion methanogenesis area is communicated with the water outlet tank 131 through the water outlet pipe 132.
In the above embodiment, as shown in fig. 2, the gas-liquid separation valve 113 made of organic glass plate includes a vent pipe 200 and an outer cover 201 covering the vent pipe, the vent pipe 200 passes through the partition plate and extends to above the partition plate; above the partition board, the bottom end opening of the outer cover 201 (the upper bottom surface and the side surface are sealed and cover the vent pipe) is supported and fixed through the supporting part, and a distance is arranged between the vent pipe 200 and the partition board, wherein the highest point of the vent pipe 200 is higher than the lowest point of the outer cover 201, biogas generated in the anaerobic digestion methanogenesis area sequentially passes through the vent pipe 200, gaps among the outer cover 201 and the vent pipe 200 from the anaerobic digestion methanogenesis area 112 through air stripping action and enters the acidogenic fermentation area 111, and simultaneously, as gas overflows from the gas-liquid separation valve, the common action of the vent pipe 200 and the overflowing gas plays a role in preventing feed liquid in the acidogenic fermentation area 111 from entering the anaerobic digestion methanogenesis area 112.
The process of the present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention. The examples provided below serve as a guide for further modifications by a person skilled in the art and do not constitute a limitation of the invention in any way.
The experimental procedures in the following examples, unless otherwise indicated, are conventional and are carried out according to the techniques or conditions described in the literature in the field or according to the instructions of the products. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
In the following examplesClostridium cellulolyticumBacterial, product name:Clostridium cellulolyticum(DSM 5812), sales company: DSMZ company, germany (website: www.dsmz.de).
Example 1
The recycling of the agricultural and forestry wastes is carried out according to the following steps to cooperate with CO 2 Fixing and methane upgrading:
s1, adding crushed agricultural and forestry waste (such as one or more of straws, lawn grass, garden trimmed leaves and the like) which is sieved by a 60-80 mesh sieve and water into a feeding pool 101, stirring the agricultural and forestry waste and the water by a stirring paddle 104 under the action of a stirrer 105 to prepare mixed feed liquid with TS of about 10%, feeding in a semi-continuous flow mode, opening a feeding pump 103 during feeding, feeding the feed liquid into an acid production fermentation area 111 through a feeding pipe 102 and a water inlet 1111 of the acid production fermentation area, inoculating the agricultural and forestry waste in the acid production fermentation area 111 into anaerobic fermentation liquid domesticated by a methane production inhibitor, namely 2-bromoethyl sodium sulfonateHydrolyzing and producing acid by mixed flora (without methanogenesis function), and inoculatingClostridium cellulolyticum(DSM 5812) strains for increasing the fermentative acidogenic efficiency of forestry and agricultural residues (inoculum size 10% (OD) 600 >0.5 The culture solution is Medium 520 of DSMZ company, anaerobic, 35 ℃), the liquid retention time is 5 d, the solid retention time is 15 d, the material slag is periodically discharged through a first slag discharge hole 1116 and a second slag discharge hole 1117, and the discharge mode is as follows: opening four first slag discharge ports 1116 for pumping every 15 d;
s2, adding anaerobic granular sludge (TS =10.7%, VS = 8.1%) to the bottom of the anaerobic digestion methane production area 112 to form a sludge bed area 1121, starting an acidogenic fermentation area outlet water pump 1114 according to the hydraulic retention time to enable first-stage outlet water, namely the acidogenic fermentation area outlet water to enter the sludge bed area 1121 through an acidogenic fermentation area water outlet 1112 and an acidogenic fermentation area water outlet pipe 1113, and uniformly distributing water through a water distribution device 1124; the effluent of the anaerobic digestion methanogenesis area 112 flows into the effluent pool 131 through an effluent outlet 1123 of the anaerobic digestion methanogenesis area at the top of the area through an effluent pipe 132 provided with an effluent valve 133; the biogas generated by the anaerobic digestion methanogenesis area 112 enters the acidogenic fermentation area 111 through a gas-liquid separation valve 113 under the gas stripping action; in the reaction process, the temperature of the heat-insulating water jacket 114 is controlled to be 35 to 37 ℃;
s3, the agriculture and forestry wastes of the acid-producing fermentation area 111 act on CO in the biogas under the action of microorganisms 2 Fixing, and allowing the upgraded marsh gas to enter a marsh gas collecting tank 122 through a marsh gas inlet and outlet 1115 and a marsh gas collecting pipe 121 provided with a marsh gas collecting pipe valve 124; when in use, the biogas in the biogas collection tank 122 is output through the gas pipe 126 provided with the gas meter 127.
S4, the biogas entering the biogas collecting tank 122 passes through a biogas circulating pipe 123 provided with a biogas circulating pipe valve 125 and enters the acid-producing fermentation area 111 again through a biogas inlet/outlet port 1115, so that CO in the biogas is enabled to enter the acid-producing fermentation area 111 2 Is further fixed, and the gas in the area can form a certain stirring effect, thereby promoting mass transfer and improving the treatment effect.
By the method, the reactor can realize 40-70% of CO in the biogas 2 Fixing; the acid production efficiency is 80 percent.
Acid production efficiency calculation formula:
comparative example 1
By adopting the device and the method, the resource utilization of the agricultural and forestry wastes is realized to cooperate with CO 2 Fixation and biogas upgrading, with the difference that inoculation is not presentClostridium cellulolyticumThe strain can realize 30-50% of CO in the methane 2 Fixing; the acid-producing fermentation efficiency is 60%.
As can be seen from example 1 and comparative example 1, inoculationClostridium cellulolyticumThe strain can make CO in the biogas 2 The fixation rate is improved by 10-20%, and the acid production efficiency is improved by 20%.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications, or equivalent changes and modifications, which are possible and equivalent embodiments of the present invention can be made by using the technical contents disclosed above without departing from the technical scope of the present invention.
Claims (10)
1. Agricultural and forestry waste recycling synergistic CO 2 The device for fixing and upgrading methane is characterized by comprising:
a feeding device;
the anaerobic reactor is characterized in that the inner space of the anaerobic reactor is divided into an upper acidogenic fermentation area and a lower anaerobic digestion methanogenic area by a partition plate, and the partition plate is provided with a gas-liquid separation valve for enabling methane generated by the anaerobic digestion methanogenic area to enter the acidogenic fermentation area and preventing feed liquid of the acidogenic fermentation area from entering the anaerobic digestion methanogenic area; the lower end of the side wall of the acid-producing fermentation area is provided with a water inlet, the upper end of the side wall is provided with a water outlet, the top of the side wall is provided with a methane gas inlet and a methane gas outlet, and the feeding device is communicated with the water inlet; a sludge bed area is arranged at the lower part in the anaerobic digestion methanogenesis area, a water inlet is formed in the side wall of the sludge bed area, a water outlet of the acidogenic fermentation area is communicated with the water inlet of the anaerobic digestion methanogenesis area, and a water outlet is formed in the upper end of the side wall of the anaerobic digestion methanogenesis area;
the biogas collecting device comprises a biogas collecting pipe, a biogas collecting tank and a biogas circulating pipe, wherein the biogas collecting pipe is connected to the biogas collecting tank through the biogas outlet, the biogas collecting pipe is positioned above the liquid level of the acid-producing fermentation area, and the biogas circulating pipe extends into the bottom of the acid-producing fermentation area through the biogas inlet;
and the water outlet of the anaerobic digestion methanogenesis area is communicated with the water outlet device.
2. Agricultural and forestry waste resource CO-CO according to claim 1 2 The device for fixing and improving the quality of the biogas is characterized in that: and an isolating device is arranged at a water outlet of the acidogenic fermentation area to prevent solid substrates and microorganisms in the acidogenic fermentation area from entering the anaerobic digestion methanogenesis area and losing.
3. Agricultural and forestry waste resource synergistic CO according to claim 1 or 2 2 The device for fixing and improving the quality of the biogas is characterized in that: the gas-liquid separation valve comprises a vent pipe and an outer cover which is covered outside the vent pipe, and the vent pipe penetrates through the partition plate and extends to the position above the partition plate; the bottom opening of dustcoat and with the breather pipe with all be equipped with the interval between the baffle, wherein, the highest point of breather pipe is higher than the lowest point of dustcoat, the marsh gas that anaerobic digestion methane production district produced loops through the air stripping action the breather pipe, the dustcoat with the gap entering between the breather pipe the acid production fermentation district.
4. Agricultural and forestry waste resource synergistic CO according to claim 1 or 2 2 The device for fixing and improving the quality of the biogas is characterized in that:the sludge bed area accounts for one third of the anaerobic digestion methanogenesis area;
the bottom of the sludge bed zone is provided with a water distribution device, and a water inlet of the anaerobic digestion methane production zone is communicated with the water distribution device.
5. Agricultural and forestry waste resource synergistic CO according to claim 1 or 2 2 The device for fixing and improving the quality of the biogas is characterized in that: the anaerobic reactor is wrapped by a heat preservation water jacket, and the heat preservation water jacket is connected with the hot water circulator.
6. Agricultural and forestry waste resource synergistic CO according to claim 1 or 2 2 The device for fixing and improving the quality of the biogas is characterized in that: a plurality of slag discharge ports are formed in the side wall of the bottom end of the acid-producing fermentation area;
the slag discharge port comprises a first slag discharge port and a second slag discharge port which are positioned at different heights, and the first slag discharge port is lower than the bottom of the biogas circulating pipe;
the first slag discharge port comprises a plurality of slag discharge ports which are distributed at the same height at equal intervals;
each slag discharging port is connected with a slag discharging pipe.
7. Agricultural and forestry waste resource synergistic CO according to claim 1 or 2 2 The device for fixing and improving the quality of the biogas is characterized in that: the feeding device comprises a feeding tank, a feeding pipe and a feeding pump, wherein a stirring paddle is arranged in the feeding tank and connected with a stirrer, and the feeding tank is communicated with a water inlet of the acidogenic fermentation area through the feeding pipe;
the water outlet device comprises a water outlet pool and a water outlet pipe, a valve is arranged on the water outlet pipe, and a water outlet of the anaerobic digestion methanogenesis area is communicated with the water outlet pool through the water outlet pipe.
8. Agricultural and forestry waste resource synergistic CO according to claim 1 or 2 2 The device for fixing and improving the quality of the biogas is characterized in that: the biogas collecting pipe and the biogas circulationValves are respectively arranged on the ring pipes;
the top of the biogas collecting tank is connected with a gas pipe and a gas meter.
9. CO for recycling of agro-forestry wastes with a device according to any one of claims 1 to 8 2 The method for fixing and upgrading the methane comprises the following steps:
s1, mixing smashed and sieved agricultural and forestry wastes with water, introducing the mixture into an acid-producing fermentation area, inoculating microorganisms to carry out acid-producing fermentation, and discharging material residues through a residue discharge port at regular intervals;
s2, adding anaerobic granular sludge into the sludge bed area, allowing feed liquid flowing out of the acidogenic fermentation area to enter the sludge bed area for anaerobic digestion, allowing effluent to enter the effluent device, and allowing biogas to enter the acidogenic fermentation area through the gas-liquid separation valve under the action of gas stripping;
s3, the agriculture and forestry wastes in the acid-producing fermentation area act on CO in the biogas under the action of the microorganisms 2 Fixing, and feeding the upgraded methane into the methane collection tank;
s4, enabling the marsh gas in the marsh gas collecting tank to enter the acid-producing fermentation area again through the marsh gas circulating pipe, and enabling CO in the marsh gas to be in contact with the acid-producing fermentation area 2 Is further fixed.
10. Agricultural and forestry waste recycling synergistic CO according to claim 9 2 The method for fixing and improving the quality of the biogas is characterized by comprising the following steps: mixing the agricultural and forestry wastes with water and feeding in a semi-continuous flow mode;
the microorganism is anaerobic fermentation mixed flora domesticated by a methanogenesis inhibitor and addedClostridium cellulolyticumStrain;
the anaerobic fermentation mixed flora domesticated by the methanogenesis inhibitor has no methanogenesis function.
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