CN102321673B - Method for producing biogas by solid organic waste - Google Patents
Method for producing biogas by solid organic waste Download PDFInfo
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Abstract
A method and a device for producing biogas by solid organic wastes. The method comprises the following steps of: a pretreatment step; a solid-liquid separation step; a liquid anaerobic fermentation step; a solid anaerobic fermentation step; a secondary integrated anaerobic fermentation step, and a biogas collection utilization and residue liquid treatment step. The device comprises a solid-liquid separator, a liquid anaerobic fermentation system, a solid anaerobic fermentation system, a secondary integrated anaerobic fermentation reactor, a gas collection and utilization system, and a biogas residue liquid treatment system; the solid-liquid separator is connected with the liquid anaerobic fermentation system and the solid anaerobic fermentation system respectively; the liquid anaerobic fermentation system and the solid anaerobic fermentation system are connected with the secondary integrated anaerobic fermentation reactor respectively; the secondary integrated anaerobic fermentation reactor is connected with the gas collection and utilization system and the biogas residue liquid treatment system respectively. The invention realizes the harmless treatment and energy utilization of organic wastes.
Description
Technical field
The present invention relates to a kind of solid organic castoff treatment process, particularly the method and apparatus of a kind of solid organic castoff anaerobically fermenting biological flue gas processed.
background technology
Sustained and rapid development along with China's economy, organic solid castoff comprises that domestic waste, agricultural wastes, intensive feces of livestock and poultry, sewage sludge equal yield line are huge, and composition is very complicated, often contain the environmental pollutant such as a large amount of moisture, volatile matter, pathogenic agent, parasitic ovum and heavy metal, if dealt with improperly, can cause serious harm to nature and social environment.As simple air storage, land occupation, destroys view, and the oxious component in waste can carry out by blowing airborne transmission, or invades soil and groundwater source, polluted river etc. through raining.
For organic solid castoff feature, the main method adopting at present has landfill, burning, anaerobically fermenting etc.Landfill method is processed solid organic castoff, and process is very simple, but needs a large amount of freight charges and landfill place.Along with the growth of population and the development of urbanization, the soil that can be used for landfill reduces, and the landfill of refuse is subject to the restriction in place; In addition, waste decomposes and rots to emit a large amount of gases such as methane after landfill, produces Greenhouse effect; And, through sunlight exposure and rainwater leach liquor and leaching vat meeting polluted underground water, cause the eutrophication of water body, bring secondary pollution to the water resources of critical shortage; For burning disposal, it is apparatus expensive not only, and maintenance cost is high, meanwhile, also can produce the problems such as organic pollutant Dioxins that some toxicity are very high in burning process, and government and street levels is also held careful attitude to burning disposal at present.It is to utilize the Decomposition of microorganism to make its innoxious energy, food, feed and fertilizer etc. of being converted into that Unareobic fermentation is processed solid organic castoff, reaches recycling and obtain biological flue gas in treating refuse.
The anaerobically fermenting of organic solid castoff is just divided into wet-fermentation and dry method fermentation according to total solids (TS) content.Wet-fermentation refers to that the solid holdup of charging is less than 15%, and dry anaerobic fermentation refers to that the solid holdup of charging is 20%-50%.Wet type anaerobic fermentation technology is relatively ripe, and all more perfect in design, operational management, but can produce a large amount of natural pond liquid after fermentation, deals with improperly and easily causes secondary pollution.The dry method relative wet-fermentation that ferments has more advantages, little such as floor space, energy consumption is little, working cost is low, process is without adding fresh water, after fermentation ends, liquid generation little, pre-treatment in natural pond simply, without removing sand, can not producing scum silica frost and precipitation etc., more and more receives publicity.But because dry method fermentation system exists the shortcoming of input and output material difficulty, mass transfer, heat transfer difficulty, in extensive, industrialization engineering, apply and also have difficulties at present.
Application number is " 201010130966 ", name is called the Chinese invention patent application of " a kind of method that municipal domestic organic refuse enhanced hydrolysis and anaerobic digestion produce biological flue gas ", it adopts enhanced hydrolysis and anaerobically fermenting to produce the method for biological flue gas, can realize the recovery energy of organic waste, but its technique need reduce to organism fragmentation below 1cm, raw material after fragmentation is put into raw material equalizing tank, and need to add water or fermented liquid adjusting raw material solid concentration, control the solids concn of raw material lower than 15%, therefore it still cannot overcome the drawback of wet-fermentation technology.
Summary of the invention
Technical problem to be solved by this invention is to provide the method and apparatus of a kind of solid organic castoff biological flue gas processed, wet-fermentation technology in prior art can be overcome and fresh water need be added, after fermentation ends, produce a large amount of natural ponds liquid, easily cause the deficiencies such as secondary pollution and dry method fermentation input and output material difficulty, mass transfer, heat transfer difficulty, to realize organic waste harmless treatment and recovery energy.
To achieve these goals, the invention provides the method for a kind of solid organic castoff biological flue gas processed, wherein, comprise the following steps:
A, pre-treatment step, to organic waste collect, sorting and/or fragmentation, and in advance to inoculating domestication for the mud of anaerobically fermenting;
B, solid-liquid separation step, directly carry out solid-liquid separation by the organic waste after described pre-treatment step is processed;
C, liquid anaerobically fermenting step, carry out anaerobically fermenting to prepare biological flue gas by the isolated liquid starting material of described solid-liquid separation step, and collect prepared biological flue gas;
D, solid anaerobic fermentation step, carry out anaerobically fermenting to prepare biological flue gas by the isolated solid material of described solid-liquid separation step, and collect prepared biological flue gas;
E, secondary integral anaerobic fermentation step, continue fermentation to prepare biological flue gas by the raw material after described liquid anaerobically fermenting step and described solid anaerobic fermentation step process, and collect prepared biological flue gas;
F, biological flue gas utilization and slag liquid treatment step, the biological flue gas of collecting in described liquid anaerobically fermenting step, described solid anaerobic fermentation step and described secondary integral anaerobic fermentation step is utilized after purifying and emission treatment described in the slag liquid that produces of secondary integral anaerobic fermentation step.
The method of above-mentioned solid organic castoff biological flue gas processed, wherein, described liquid anaerobically fermenting step comprises:
C1, liquid pre-treatment heating steps, by the liquid starting material after described solid-liquid separation step separation carry out modified, inoculate, preheat;
C2, intermediate temperature anaerobic fermentation step, carry out intermediate temperature anaerobic fermentation to prepare biological flue gas by the liquid starting material after described liquid pre-treatment heating steps heats.
The method of above-mentioned solid organic castoff biological flue gas processed, wherein, described liquid pre-treatment heating steps comprises, liquid starting material after described solid-liquid separation step is delivered to liquid pre-treatment equalizing tank, carry out pre-treatment, modified and inoculation, controlling described liquid pre-treatment equalizing tank temperature is 20 ℃～35 ℃, and the time that described liquid starting material stops in described liquid pre-treatment equalizing tank is 1～1.5 day.
The method of above-mentioned solid organic castoff biological flue gas processed, wherein, described intermediate temperature anaerobic fermentation step comprises, raw material after described liquid pre-treatment heating steps is pumped into and in intermediate temperature anaerobic fermentation reactor, carries out intermediate temperature anaerobic fermentation, controlling intermediate temperature anaerobic fermentation temperature of reactor is 30 ℃～38 ℃, pH is 6～8, and the residence time is 10～35 days.
The method of above-mentioned solid organic castoff biological flue gas processed, wherein, described solid anaerobic fermentation step comprises:
D1, solid pre-treatment heating steps;
D2, high-temperature anaerobic fermentation step, the solid material after described solid pre-treatment heating steps is heated carries out high-temperature anaerobic fermentation to prepare biological flue gas; And
D3, secondary solid-liquid separation step, carry out secondary solid-liquid separation to the material after described high-temperature anaerobic fermentation step, and the liquid after separation continues fermentation by described secondary integral anaerobic fermentation step.
The method of above-mentioned solid organic castoff biological flue gas processed, wherein, described solid pre-treatment heating steps comprises: the solid material after described solid-liquid separation step is delivered to solid heat pre-treatment pond, heat, modified, controlling described solid heat pre-treatment pond temperature is 50 ℃～70 ℃, and described solid material residence time in heating pond is 1～2 day.
The method of above-mentioned solid organic castoff biological flue gas processed, wherein, described high-temperature anaerobic fermentation step comprises, solid material after described solid pre-treatment heating steps is processed is delivered in solid thermophilic fermentation reactor and carries out high-temperature anaerobic fermentation, the temperature of controlling described solid thermophilic fermentation reactor is 50 ℃～60 ℃, pH value is 6.5～7.8, the residence time is 15～25 days, and the time that makes described solid material run to the other end of described solid thermophilic fermentation reactor from one end of described solid thermophilic fermentation reactor equals the time that described solid material stops in described solid thermophilic fermentation reactor.
In order to realize better above-mentioned purpose, the present invention also provides the equipment of a kind of solid organic castoff biological flue gas processed, wherein, comprise solid-liquid separating machine, liquid anaerobic fermentation system, solid anaerobic fermentation system, secondary integral anaerobic fermentation reactor, collection and confinement of gases and utilize system and biogas residue liquid treatment system, described solid-liquid separating machine is connected with described solid anaerobic fermentation system with described liquid anaerobic fermentation system respectively, described liquid anaerobic fermentation system and described solid anaerobic fermentation system are connected with described secondary integral anaerobic fermentation reactor respectively, described secondary integral anaerobic fermentation reactor is respectively with described collection and confinement of gases and utilize system to be connected with described biogas residue liquid treatment system.
The equipment of above-mentioned solid organic castoff biological flue gas processed, wherein, described liquid anaerobic fermentation system comprises liquid pre-treatment heating bath and intermediate temperature anaerobic fermentation reactor, the opening for feed of described liquid pre-treatment heating bath is connected with the liquid exit of described solid-liquid separating machine, and described intermediate temperature anaerobic fermentation reactor is connected with described secondary integral anaerobic fermentation reactor with described liquid pre-treatment heating bath respectively.
The equipment of above-mentioned solid organic castoff biological flue gas processed, wherein, described solid anaerobic fermentation system comprises solids mixing and e Foerderanlage, solid pre-treatment heating bath, solid thermophilic fermentation reactor and secondary solid-liquid separating machine, described solids mixing and e Foerderanlage are connected with described solid pre-treatment heating bath with described solid-liquid separating machine respectively, described solid thermophilic fermentation reactor respectively with described solid pre-treatment heating bath, described secondary solid-liquid separating machine, described secondary integral anaerobic fermentation reactor and described solids mixing and e Foerderanlage connect, described secondary solid-liquid separating machine is connected with described secondary integral anaerobic fermentation reactor.
Technique effect of the present invention is: the present invention can process solid organic castoff anaerobically fermenting biological flue gas processed, and process is without adding fresh water, and systematic procedure itself produces heat can be for self energy consumption demand, without external energy.Preprocessing process is simple, process operating management is simple, floor space is little, natural pond liquid generation is little, and organic clearance is high, and raw material factor of created gase is high, both can reduce the pollution of organic waste to environment, can produce clean reproducible energy biological flue gas again, can realize the recovery energy of solid waste, there is good environment and economy benefit.
Below in conjunction with the drawings and specific embodiments, describe the present invention, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of solid organic castoff anaerobically fermenting of the present invention biological flue gas processed;
Fig. 2 is the device structure block diagram of solid organic castoff anaerobically fermenting of the present invention biological flue gas processed;
Fig. 3 is the device structure schematic diagram of one embodiment of the invention solid organic castoff anaerobically fermenting biological flue gas processed.
Wherein, Reference numeral
1 solid-liquid separating machine
2 liquid anaerobic fermentation systems
21 liquid pre-treatment heating baths
22 intermediate temperature anaerobic fermentation reactors
3 solid anaerobic fermentation systems
31 solids mixings and e Foerderanlage
32 solid pre-treatment heating baths
33 solid thermophilic fermentation reactors
34 2 solid-liquid separating machines
4 secondary integral anaerobic fermentation reactors
5 collection and confinement of gases and utilize system
51 gas-cleaning installations
52 generating set and residual heat using device
6 biogas residue liquid treatment systems
A～f, c1, c2, d1～d3 step
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and principle of work are described in detail:
Referring to Fig. 1, Fig. 1 is the method flow diagram of solid organic castoff anaerobically fermenting of the present invention biological flue gas processed.The method of solid organic castoff of the present invention biological flue gas processed, comprises the following steps:
Pre-treatment step a,, to organic waste collect, sorting and/or fragmentation, and in advance to inoculating domestication for the mud of anaerobically fermenting;
Solid-liquid separation step b, directly carries out solid-liquid separation by the organic waste after described pre-treatment step is processed; In the present embodiment, utilize solid-liquid separating machine directly organic waste to be carried out to solid-liquid separation, without adding fresh water, regulate liquid phase total solids level material concentration.Organic waste is divided into efflux of solids and liquid stream, and in efflux of solids, TS concentration is greater than 30%, and in liquid stream, TS concentration is between 4～5%;
Liquid anaerobically fermenting step c, carries out anaerobically fermenting to prepare biological flue gas by the isolated liquid starting material of described solid-liquid separation step, and collects prepared biological flue gas;
Described liquid anaerobically fermenting step c comprises again:
Liquid pre-treatment heating steps c1, by the liquid starting material after described solid-liquid separation step separation carry out modified, inoculate, preheat; Liquid starting material is carried out to desilting is processed and raw material preheats through being pumped to liquid pre-treatment equalizing tank, in heating bath, be provided with whipping appts, controlling described liquid pre-treatment equalizing tank temperature is 20 ℃～35 ℃, and the time that described liquid starting material stops in described liquid pre-treatment equalizing tank is 1～1.5 day;
Intermediate temperature anaerobic fermentation step c2, carries out intermediate temperature anaerobic fermentation to prepare biological flue gas by the liquid starting material after described liquid pre-treatment heating steps heats.Raw material after above-mentioned pre-treatment is heated pumps into intermediate temperature anaerobic fermentation reactor 22 and carries out intermediate temperature anaerobic fermentation, in intermediate temperature anaerobic fermentation reactor 22, can establish and stir and Hydraulic Circulation, with realize material mass transfer, conduct heat evenly, complete anaerobically fermenting organic in liquid and decompose generation biological flue gas, controlling intermediate temperature anaerobic fermentation temperature is 30 ℃～38 ℃, preferably 33 ℃～38 ℃, pH value is 6～8, preferably pH value is 6.5～7.8, and residence time of material is 10～35 days, preferably 15～20 days residence time; Initial start stage derives from biogas plant as the inoculation bacterium of intermediate temperature anaerobic fermentation or municipal wastewater treatment plant anaeration in normal temperature is applied flexibly sludge seeding, domestication.
Solid anaerobic fermentation steps d, carries out anaerobically fermenting to prepare biological flue gas by the isolated solid material of described solid-liquid separation step, and collects prepared biological flue gas;
Described solid anaerobic fermentation steps d comprises:
Solid pre-treatment heating steps d1; After solid-liquid separation, solid is delivered to solid heat pre-treatment pond through e Foerderanlage, heat, modified, controlling described solid heat pre-treatment pond temperature is 50 ℃～70 ℃, described solid material residence time in heating pond is 1～2 day, described solid heat pre-treatment can arrange whipping appts in pond, with mass transfer enhancement, heat transfer;
High-temperature anaerobic fermentation steps d 2, the solid material after described solid pre-treatment heating steps is heated carries out high-temperature anaerobic fermentation to prepare biological flue gas.Solid materials is delivered to by e Foerderanlage in solid thermophilic fermentation reactor 33 through preheating, and in solid thermophilic fermentation reactor 33, stirring can be set, heat, attemperator, solid material after described solid pre-treatment heating steps is processed is delivered in solid thermophilic fermentation reactor 33 and carries out high-temperature anaerobic fermentation, the temperature of controlling described solid thermophilic fermentation reactor 33 is 50 ℃～60 ℃, pH value is 6～8, preferred pH value 6.5～7.8, residence time of material 10～25 days, preferably the residence time is 15～25 days, and the time that makes described solid material run to the other end of described solid thermophilic fermentation reactor 33 from one end of described solid thermophilic fermentation reactor 33 equals described solid material in the time of described solid thermophilic fermentation reactor 33 interior stops.Initial start stage derives from as the inoculation bacterium of high-temperature anaerobic fermentation the inoculation of high temperature anaerobic active sludge, the domestication that biogas plant or municipal wastewater treatment plant etc. locate; Or adopt and to derive from the inoculation of anaeration in normal temperature active sludge, the domestication that biogas plant or municipal wastewater treatment plant etc. locate, the heating mode that increases by 1 ℃ every day progressively rises to high temperature (50 ℃～60 ℃);
Secondary solid-liquid separation step d3, carries out secondary solid-liquid separation to the material after described high-temperature anaerobic fermentation step, and the liquid after separation continues fermentation by described secondary integral anaerobic fermentation step.After solid phase dry type fermentation ends, solid-liquid separation is carried out in discharging, the direct compost of solid part, and liquid portion enters secondary integral anaerobic fermentation reactor 4 and continues fermentation; After solid phase dry type fermentation ends, a part for discharging is back to solids mixing and e Foerderanlage 31 is inoculated, modified, rest part enters secondary solid-liquid separating machine 34 and carries out secondary solid-liquid separation.
Secondary integral anaerobic fermentation step e, continues fermentation to prepare biological flue gas by the raw material after described liquid anaerobically fermenting step and described solid anaerobic fermentation step process, and collects prepared biological flue gas; After the integrated fermentation reaction fermentation ends of secondary, natural pond liquid is outer row regularly, and natural pond slag enters natural pond slag bath and stores; Complete after intermediate temperature anaerobic fermentation, raw material is delivered to secondary integral anaerobic fermentation reactor 4, and secondary integral anaerobic fermentation reactor 4 is provided with side whipping appts.At the interior generation biological flue gas that can continue to ferment of secondary integral anaerobic fermentation reactor 4, store natural pond liquid, collection of biological combustion gas, secondary integral anaerobic fermentation reactor 4 can arrange attemperator, and pH value is 6～8, and residence time of material is 20～30 days; After second order reaction, natural pond slag is expelled to natural pond slag bath through biogas residue liquid treatment system 6, is regularly transported to farmland fertilization.
Biological flue gas utilizes and slag liquid treatment step f, the slag liquid that biological flue gas is used after purifying and emission treatment above-mentioned steps produces that described liquid anaerobically fermenting step, described solid anaerobic fermentation step and the preparation of described secondary integral anaerobic fermentation step are collected.The collected biological flue gas of each step all enters the top of secondary integral anaerobic fermentation reactor 4 and stores; This biological flue gas after gas-cleaning installation 51 dehydrations, desulfurization, removal of impurities all by generating set and residual heat using device 52 for generating, generating waste-heat is pre-treatment heating bath 21, solid pre-treatment heating bath 32 and intermediate temperature anaerobic fermentation reactor 22, solid thermophilic fermentation reactor 33 temperature raising and maintainings for liquid; In above-mentioned steps secondary integral anaerobic fermentation reactor 4, natural pond liquid is partly refluxed in liquid pre-treatment heating bath 21, inoculates, mass transfer, increases the amount of microorganism in charging, forced fermentation effect.
Referring to Fig. 2 and Fig. 3, Fig. 2 is the device structure block diagram of solid organic castoff anaerobically fermenting of the present invention biological flue gas processed, and Fig. 3 is the device structure schematic diagram of one embodiment of the invention solid organic castoff anaerobically fermenting biological flue gas processed.The present invention also provides a kind of support equipment that is applicable to the method for solid organic castoff anaerobically fermenting of the present invention biological flue gas processed, comprise solid-liquid separating machine 1, liquid anaerobic fermentation system 2, solid anaerobic fermentation system 3, secondary integral anaerobic fermentation reactor 4, also can comprise collection and confinement of gases and utilize system 5 and biogas residue liquid treatment system 6, described solid-liquid separating machine 1 is connected with described solid anaerobic fermentation system 3 with described liquid anaerobic fermentation system 2 respectively, described liquid anaerobic fermentation system 2 and described solid anaerobic fermentation system 3 are connected with described secondary integral anaerobic fermentation reactor 4 respectively, described collection and confinement of gases and utilize system 5 to be connected with described secondary integral anaerobic fermentation reactor 4 respectively with described biogas residue liquid treatment system 6.In the present embodiment, this collection and confinement of gases and utilize system 5 to comprise gas-cleaning installation 51 and generating set and residual heat using device 52.Wherein, described liquid anaerobic fermentation system 2 comprises liquid pre-treatment heating bath 21 and intermediate temperature anaerobic fermentation reactor 22, in described liquid pre-treatment heating bath 21, whipping appts can be set, the opening for feed of described liquid pre-treatment heating bath 21 is connected with the liquid exit of described solid-liquid separating machine 1, and described intermediate temperature anaerobic fermentation reactor 22 is connected with described secondary integral anaerobic fermentation reactor 4 with described liquid pre-treatment heating bath 21 respectively.Described solid anaerobic fermentation system 3 comprises solids mixing and e Foerderanlage 31, solid pre-treatment heating bath 32, solid thermophilic fermentation reactor 33 and secondary solid-liquid separating machine 34, described solids mixing and e Foerderanlage 31 are connected with described solid pre-treatment heating bath 32 with described solid-liquid separating machine 1 respectively, described solid thermophilic fermentation reactor 33 respectively with described solid pre-treatment heating bath 32, described secondary solid-liquid separating machine 34, described secondary integral anaerobic fermentation reactor 4 and described solids mixing and e Foerderanlage 31 connect, described secondary solid-liquid separating machine 34 is connected with described secondary integral anaerobic fermentation reactor 4.
With two specific embodiments, describe method and apparatus of the present invention in detail below.
Embodiment mono-:
Raw material is for deriving from diary farm, A city cow manure, and anaerobically fermenting inoculum derives from the anaerobic activated sludge of biogas plant.
In intermediate temperature anaerobic fermentation reactor 22, first adopt biogas plant's anaeration in normal temperature active sludge to inoculate domestication.
In solid thermophilic fermentation reactor 33, adopt biogas plant's high temperature anaerobic active sludge to inoculate domestication.
After inoculation has been tamed, carry out according to the following steps the fermentative processing of cattle farm cow dung:
(1), by the ight soil of cattle farm, by forklift collection, by e Foerderanlage, deliver to solid-liquid separating machine 1 and carry out solid-liquid separation;
(2) liquid of solid-liquid separating machine 1 separation is heated through being pumped to liquid pre-treatment heating bath 21, the temperature of controlling liquid pre-treatment heating bath 21 is 22 ℃, and fully stirs, and makes homogeneous heating.
(3) liquid starting material after above-mentioned heating is pumped into and in intermediate temperature anaerobic fermentation reactor 22, carry out intermediate temperature anaerobic fermentation, complete anaerobic fermentation of organisms biological flue gas processed in liquid, controlling intermediate temperature anaerobic fermentation temperature is 33 ℃, and pH is 6.8, and residence time of material is 15 days;
(4) after completing steps (3) intermediate temperature anaerobic fermentation, liquid starting material therefrom warm anaerobic fermentation reactor 22 is delivered to secondary integral anaerobic fermentation reactor 4, carries out further fermenting biological flue gas processed.Secondary integral anaerobic fermentation reactor 4 does not heat, is only incubated, and the waste heat in utilization in step reaction, the residence time of material of controlling secondary integral anaerobic fermentation reactor 4 is 30 days, pH value is 6.8;
(5) solid of solid-liquid separating machine 1 separation is fallen into solid pre-treatment heating bath 32 by gravity, controlling solid pre-treatment heating bath 32 temperature is 60 ℃, and fully stirs, and makes homogeneous heating.
(6) solid material after above-mentioned heating is delivered to solid thermophilic fermentation reactor 33 through lobed rotor pump, biological flue gas processed ferments.In solid thermophilic fermentation reactor 33, establish whipping appts, the time that makes solid thermophilic fermentation reactor 33 interior raw materials run to discharge end from entrance end equals the residence time of material in solid thermophilic fermentation reactor 33, controlling solid thermophilic fermentation reactor 33 interior temperature is 55 ℃, and pH value is 6.5;
(7) after the fermentation of above-mentioned steps (6) dry type, the part backflow inoculation of solid thermophilic fermentation reactor 33 dischargings, modified, another part after solid-liquid separation, isolated solid dung, isolated liquid is delivered to secondary integral anaerobic fermentation reactor 4;
(8) in secondary integral anaerobic fermentation reactor 4, complete after fermentation, natural pond liquid is regularly outer drains into farmland fertilization, and natural pond slag enters the natural pond slag bath stored for future use of biogas residue liquid treatment system 6.
(9) the top tracheae of intermediate temperature anaerobic fermentation reactor 22, solid thermophilic fermentation reactor 33 and the top air storage film of secondary integral anaerobic fermentation reactor 4 are communicated with, the biological flue gas of preparing to collect above steps.
(10) be collected in biological flue gas in secondary integral anaerobic fermentation reactor 4 after gas-cleaning installation 51 desulfurization, dehydration, removal of impurities, by generating set and bootstrap system 52 generatings, generating waste-heat for liquid pre-treatment heating bath 21, solid pre-treatment heating bath 32 and intermediate temperature anaerobic fermentation reactor 22,33 heating of solid thermophilic fermentation reactor heats.
Embodiment bis-:
Raw material is to derive from B city through the meal kitchen organic waste of sorting, and anaerobically fermenting inoculum derives from the anaerobic activated sludge of municipal wastewater treatment plant.
In intermediate temperature anaerobic fermentation reactor 22, adopt the anaeration in normal temperature active sludge inoculation domestication of above-mentioned municipal wastewater treatment plant;
In solid thermophilic fermentation reactor 33, adopt the anaerobic activated sludge inoculation domestication of above-mentioned municipal wastewater treatment plant, the heating mode that increases by 1 ℃ every day progressively rises to high temperature (58 ℃), has tamed the rear inoculum as solid thermophilic fermentation reactor 33.
Domestication is carried out meal kitchen, the city organic garbage anaerobic fermentation biological flue gas processed after sorting after having inoculated according to the following steps:
(1) utilize solid-liquid separating machine 1 to collect the changing food waste after also sorting, fragmentation to carry out solid-liquid separation;
(2) the changing food waste liquid portion after above-mentioned solid-liquid separation is flow to liquid pre-treatment heating bath 21 certainly;
(3) part natural pond liquid in secondary integral anaerobic fermentation reactor 4 is back to liquid pre-treatment heating bath 21, inoculate with above-mentioned steps (2), modified, preheat, and fully stir, control in heating bath 25 ℃ of temperature;
(4) solid part after above-mentioned solid-liquid separation is delivered to solid pre-treatment heating bath 32;
(5) by the solids backflow of solid thermophilic fermentation reactor 33 output sections to solids mixing and e Foerderanlage 31, carry out pre-treatment inoculation, preheat with above-mentioned steps (4), and fully stir, controlling temperature in heating bath is 60 ℃;
(6) raw material after aforesaid liquid pre-treatment heating bath 21 is heated pumps into intermediate temperature anaerobic fermentation reactor 22 and carries out intermediate temperature anaerobic fermentation biological flue gas processed, controlling 22 temperature of intermediate temperature anaerobic fermentation reactor is 38 ℃, pH value is 7.0, and residence time of material is 25 days;
(7) solid material after above-mentioned solid pre-treatment heating bath 32 is heated is pumped into and in solid thermophilic fermentation reactor 33, carries out high-temperature anaerobic fermentation biological flue gas processed through field spider, the temperature of controlling solid thermophilic fermentation reactor 33 is 58 ℃, pH value is 7.2, and residence time of material is 22 days;
(8) after intermediate temperature anaerobic fermentation reactor 22 fermentation ends, discharging enters secondary integral anaerobic fermentation reactor 4 through drawing mechanism, secondary integral anaerobic fermentation reactor 4 is not established and is heated, only establish attemperator, if side stirs, mass transfer enhancement and broken shell, pH value is 7.2, residence time of material 55 days;
(9) after solid thermophilic fermentation reactor 33 fermentation ends, material carries out secondary solid-liquid separation by secondary solid-liquid separating machine 34, and the liquid after separation pumps into secondary integral anaerobic fermentation reactor 4, the direct compost of solid;
(10) the natural pond liquid in secondary integral anaerobic fermentation reactor 4 applies fertilizer and regularly, arranges season, carries out farmland fertilization, and natural pond slag enters the natural pond slag bath of biogas residue liquid treatment system 6 and stores, and applies fertilizer and discharges external application season.
The present invention can process solid organic castoff anaerobically fermenting biological flue gas processed, and process is without adding fresh water, and fermenting process itself produces heat can be for self energy consumption demand, without external energy.Preprocessing process is simple, process operating management is easy, floor space is little, natural pond liquid generation is little, and organic clearance is high, and raw material factor of created gase is high, both can reduce the pollution of organic waste to environment, can produce clean reproducible energy biological flue gas again, can realize the recovery energy of solid waste, there is good environment and economy benefit.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (3)
1. a method for solid organic castoff biological flue gas processed, is characterized in that, comprises the following steps:
A, pre-treatment step, to organic waste collect, sorting and/or fragmentation, and in advance to inoculating domestication for the mud of anaerobically fermenting;
B, solid-liquid separation step, organic waste after described pre-treatment step is processed is directly carried out to solid-liquid separation, without adding fresh water, regulate liquid phase total solids level material concentration, described organic waste is divided into efflux of solids and liquid stream, in described efflux of solids, TS concentration is greater than 30%, and in described liquid stream, TS concentration is between 4～5%;
C, liquid anaerobically fermenting step, carry out anaerobically fermenting to prepare biological flue gas by the isolated liquid starting material of described solid-liquid separation step, and collect prepared biological flue gas, comprising:
C1, liquid pre-treatment heating steps, by the liquid starting material after described solid-liquid separation step separation carry out modified, inoculate, preheat, liquid starting material after described solid-liquid separation step is delivered to liquid pre-treatment equalizing tank, carry out pre-treatment, modified and inoculation, controlling described liquid pre-treatment equalizing tank temperature is 20 ℃～35 ℃, and the time that described liquid starting material stops in described liquid pre-treatment equalizing tank is 1～1.5 day;
C2, intermediate temperature anaerobic fermentation step, carry out intermediate temperature anaerobic fermentation to prepare biological flue gas by the liquid starting material after described liquid pre-treatment heating steps heats, and comprising:
Raw material after described liquid pre-treatment heating steps is pumped in intermediate temperature anaerobic fermentation reactor and carries out intermediate temperature anaerobic fermentation, and controlling intermediate temperature anaerobic fermentation temperature of reactor is 30 ℃～38 ℃, and pH value is 6～8, and the residence time is 10～35 days;
D, solid anaerobic fermentation step, carry out anaerobically fermenting to prepare biological flue gas by the isolated solid material of described solid-liquid separation step, and collect prepared biological flue gas, comprising:
D1, solid pre-treatment heating steps, solid material after described solid-liquid separation step is delivered to solid heat pre-treatment pond, heat, modified, controlling described solid heat pre-treatment pond temperature is 50 ℃～70 ℃, described solid material residence time in heating pond is 1～2 day;
D2, high-temperature anaerobic fermentation step, solid material after described solid pre-treatment heating steps is heated carries out high-temperature anaerobic fermentation to prepare biological flue gas, solid material after described solid pre-treatment heating steps is processed is delivered in solid thermophilic fermentation reactor and carries out high-temperature anaerobic fermentation, the temperature of controlling described solid thermophilic fermentation reactor is 50 ℃～60 ℃, pH value is 6.5～7.8, and the residence time is 10～25 days;
E, secondary integral anaerobic fermentation step, continue fermentation to prepare biological flue gas by the raw material after described liquid anaerobically fermenting step and described solid anaerobic fermentation step process, and collect prepared biological flue gas;
F, biological flue gas utilization and slag liquid treatment step, the biological flue gas of collecting in described liquid anaerobically fermenting step, described solid anaerobic fermentation step and described secondary integral anaerobic fermentation step is utilized after purifying and emission treatment described in the slag liquid that produces of secondary integral anaerobic fermentation step.
2. the method for solid organic castoff as claimed in claim 1 biological flue gas processed, is characterized in that, described solid anaerobic fermentation step also comprises:
D3, secondary solid-liquid separation step, carry out secondary solid-liquid separation to the material after described high-temperature anaerobic fermentation step, and the liquid after separation continues fermentation by described secondary integral anaerobic fermentation step.
3. the method for solid organic castoff as claimed in claim 1 or 2 biological flue gas processed, it is characterized in that, described high-temperature anaerobic fermentation step also comprises, described solid material runs to the other end of described solid thermophilic fermentation reactor time from one end of described solid thermophilic fermentation reactor equals the time that described solid material stops in described solid thermophilic fermentation reactor.
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| CN103865790B (en) * | 2014-03-07 | 2016-02-10 | 河北科技大学 | The device of a kind of terramycin strain slag harmlessness process and technique |
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