CN102992559A - Method for comprehensively utilizing anaerobic digestion and carbonization of municipal sludge - Google Patents
Method for comprehensively utilizing anaerobic digestion and carbonization of municipal sludge Download PDFInfo
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- CN102992559A CN102992559A CN2012105238873A CN201210523887A CN102992559A CN 102992559 A CN102992559 A CN 102992559A CN 2012105238873 A CN2012105238873 A CN 2012105238873A CN 201210523887 A CN201210523887 A CN 201210523887A CN 102992559 A CN102992559 A CN 102992559A
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention provides a method for comprehensively utilizing the anaerobic digestion and carbonization of municipal sludge. The method for comprehensively utilizing the anaerobic digestion and carbonization of the municipal sludge comprises the following steps: conditioning the sludge by adopting a physical or chemical or physicochemical method; then conveying into a Germany Lipp complete-mixing anaerobic digestion tank, controlling the temperature inside the Germany Lipp complete-mixing anaerobic digestion tank to 35-37 DEG C, and stirring the sludge inside the Germany Lipp complete-mixing anaerobic digestion tank to uniformly mix the sludge for anaerobic digestion treatment, so that an anaerobic digestion solution and a biogas containing 60%-70% of methane are generated; carrying out solid-liquid separation on the anaerobic digestion solution by adopting a rotational flow reactor to separate biogas residues with the water ratio of 50%-70%, and then directly mixing to the biogas residues with the water ratio of 20%-30% with wood chips or waste paper; and conveying into a high-temperature high-pressure internal heating type rotary furnace carbonization device to generate a carbonization gas and sludge biochar through anaerobic or oxygen-poor reaction. The method provided by the invention has the advantages of high biogas production efficiency, small size of the sludge biochar, convenience for transportation and storage and N, P, K nutritive element enrichment and is widely applied to the field of agriculture and the like.
Description
Technical field
The invention belongs to environment project and field of ecological agricultural, relate to processing and the disposal of municipal sludge, specifically the method for a kind of urban mud anaerobic digestion and carbonization comprehensive utilization.
Background technology
In recent years, under national energy-saving reduction of discharging and pro-active fiscal policy effect, town sewage is processed and is developed rapidly, and the Urban Water environmental improvement obtains remarkable effect, along with improving constantly of China's town sewage processing rate, the urban wastewater treatment firm sludge yield also sharply increases.2009,1992 of the urban wastewater treatment firms that puts into operation in the whole nation, the amount of disposing of sewage 28,000,000,000 m
3, about 2,005 ten thousand t of mud of generation water ratio 80%, along with the increase of the level of urbanization and sewage load, sludge quantity is with very fast breakthrough 3,000 ten thousand t.According to incompletely statistics, present national urban wastewater treatment firm mud only has small portion to carry out in various degree treatment and disposal, and major part is not carried out normalized processing and disposed.Mud contains the hazardous and noxious substances such as pathogenic agent, heavy metal and persistent organism, water ratio is very high, dispose without effectively processing, very easily underground water, soil etc. is caused secondary pollution, direct threatening environment safety and public health, the environmental benefit of sewage treatment facility is reduced greatly, affect the positively effect that national energy-saving reduces discharging strategy implementation.
The at present processing of domestic city mud is mainly adopted landfill, anhydration and incineration, is processed and dispose as modes such as farming fertilizer; Landfill mud need to take a large amount of agricultural arable lands; The anhydration and incineration of mud, the ubiquity construction investment is large, and the problem that working cost is high is difficult to support economically.Compare above treatment process, adopt anaerobic digestion techniques not only can realize the minimizing of mud, innoxious, stabilization and resource utilization; Mud is after anaerobic digestion, and volume reduces about 50%, can realize minimizing; Through behind the mesophilic digestion, the unwanted bacteria in the mud obtains a large amount of eliminations, can realize innoxious and stabilization; The biogas that anaerobic digestion produces can be used for fuel and generating, and the energy consumption of compensation water factory is industry energy conservation 30%, is one of at present the most feasible sludge treatment technique, can realize resource utilization and energy-saving.
But present employed sludge anaerobic treatment process exists state of the art low, sludge treatment weak effect, the low series of problems that waits of biogas utilization rate.And the sludge anaerobic treatment process also can produce the natural pond slag except producing biogas; Slag disposing technique most of composting technology that adopts in existing natural pond prepares fertilizer, but a large amount of land resources of this arts demand, application is restricted in developed regions.
Country's " " 12 " energy-conserving and environment-protective industrial development planning " environmental protection industry gordian technique ﹠ Mud technology emphasis is to be used for farmland, burning and production building material product etc. behind anaerobic sludge digestion or the aerobic fermentation to process disposal technology, the anaerobism effect process of mud proposes the principle that China's ﹠ Mud should meet " safety and environmental protection, recycle, save energy and reduce the cost, suit measures to local conditions, safe reliable " in the requirement of " urban wastewater treatment firm ﹠ Mud and pollution prevention technique policy ".Wherein recycle and energy-saving and cost-reducing bringing forward respectively by energy and encouragement in the anaerobic digestion techniques recovery mud are utilized biogas heat energy, rubbish and the sludge incineration waste heat that produces in the anaerobic sludge digestion process.Therefore, it is the most important thing of current ﹠ Mud that Anaerobic Digestion is disposed, and does not have at present a kind of method of comprehensive utilization of suitable sludge treatment.
Summary of the invention
The objective of the invention is urban mud anaerobic digestion and carbonizing treatment, produce biogas and preparation mud carbide, realize minimizing, energy, the Fertilizer Transformed of mud, finally reach the method that urban mud anaerobic digestion and the carbonization of the comprehensive utilization of resources of mud fully utilize.
The method of described a kind of urban mud anaerobic digestion and carbonization comprehensive utilization is characterized in that the concrete steps of described technique are as follows successively:
(1) sludge conditioning: adopt physical method or chemical process or adopt first physical method to adopt again chemical process that mud is nursed one's health, make that moisture percentage in sewage sludge after the conditioning is 90～92%, carbon-nitrogen ratio is 10～20, pH is 6.5～7.5;
(2) the complete mixing anaerobic digestion of mud: will be transported to complete mixing anaerobic digester by satisfactory mud after step (1) conditioning, the complete mixing anaerobic digester here adopts German Lipp anaerobic digestor (being called for short German sharp Pu tank), the temperature of controlling in the complete mixing anaerobic digester is 35～37 ℃, and regulate and control the interior local temperature difference of complete mixing anaerobic digester at ± 0.5 ℃, then pass through pneumatic stirring, or intermittent type mechanical stirs, or carry out simultaneously pneumatic stirring and intermittent type mechanical and stir the mud make in the tank and mix, after carrying out Anaerobic Digestion 15-20 days, produce anaerobic digestion solution and the biogas that contains methane 60～70%, with the existing dehydration of biogas process that contains methane 60～70% of producing, collect in the tank for sewage gas for subsequent use after desulfurization and the carbonization treatment, in anaerobic digestion process: described pneumatic stirring is to adopt biogas return stirring mode, identical with existing methane-generating pit pneumatic stirring mode, first the biogas of the generation in the tank is extracted out outside the tank, pour in the tank from pot bottom by gas diffusion tube after compression, produce stronger gas backstreaming, thereby reach the purpose that stirs feed liquid; It is that to adopt rotating speed be the alr mode that the intermittent type mechanical whipping appts of 10～60r/min carries out that described intermittent type mechanical stirs;
(3) Digestive system solid-liquid separation: adopt Cyclonic reactor that the anaerobic digestion solution that produces in the step (2) is carried out solid-liquid separation, isolate the natural pond slag of water ratio 50～70%, natural pond liquid after the separation is as the raw material of fertilizer, or qualified discharge or comprehensive utilization after the process bio-oxidation pond art breading;
(4) natural pond slag carbonizing treatment: adopting middle water ratio 50～70% natural pond slags that separate of wood chip or waste paper and step (3) is that directly to be mixed to get water ratio be 20～30% natural pond slag to 1: 3～10 ratios according to mass ratio, be that 20～30% natural pond slag is transported in the High Temperature High Pressure internal heat type converter carbonizing plant again with water ratio, anaerobism or hypoxia response 10～20min, produce carbonization gas and sludge organism carbon, the carbonization gas that wherein produces after the reaction directly is conveyed into to burn away in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant provides heat for carburizing reagent; In the reaction process: the temperature of reaction in the High Temperature High Pressure internal heat type converter carbonizing plant is that 600～800 ℃, pressure are 15.0～16.0Mpa.
The conditioning of physics described in the step (1) is to add wood chip or waste paper in mud, and make mud and wood chip or waste paper according to mass ratio 10～500: 1 ratio is mixed; Described chemical conditioning is to add arbitrarily several following materials of measuring in through the mud after the physics conditioning: 10.0～100.0mg/L chitosan, 1.0～10.0mg/L polyacrylamide and 20.0～150.0mg/L calcium hydroxide make the pH of mud reach 6.5～7.5.
The complete mixing anaerobic digestion of the mud described in the step (2), carrying out in the mixing anaerobic digester fully, described complete mixing anaerobic digester tank body adopts three-decker to consist of, outer is that compound flaggy, middle layer are that thermal insulation layer, internal layer are the stainless steel clad plate layer, in the mixing anaerobic digester Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system are set fully, described Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system all adopt existing technology and device.
Natural pond slag carbonizing treatment described in the step (4) is carried out at High Temperature High Pressure internal heat type converter carbonizing plant, this carbonizing plant comprises inner converter, intermediate combustion chamber and outer hull, the natural pond slag is delivered in the burner hearth of inner converter, adopt the reaction of electrically heated Starting mode high temperature cabonization, Formed oxidizing gases and biological carbon product; The carbonization gas that produces is ejected in the combustion chamber by spraying technique and burns, and provides heat for natural pond slag in the converter carries out carburizing reagent.
Biological carbon particle diameter 0.5～1.0mm, the water ratio of preparation are 5～10% in the step (4), filling proportion is 0.50～0.55g/cm
3, contain N, P, K element.
Beneficial effect of the present invention: 1. the mud among the present invention enters in the complete mixing anaerobic retort and carries out anaerobic digestion after process physics or chemistry or physics and chemistry mixing conditioning; It is short that the complete mixing anaerobic retort of Germany Li Pu has the construction period, insulation and favorable anti-corrosion effect, the high characteristics such as (gas production rate can improve 5.0～15.0%) of gas producing efficiency; Prepare Sweet natural gas after the biogas process dehydration desulfurization and decarburization art breading that produces, the natural gas methane content of preparation can be used for fuel, generating and vehicle mounted gas etc. up to more than 98.0%;
2. can be for the production of the raw material of fertilizer through a natural pond liquid part of carrying out in the complete mixing anaerobic retort after the anaerobic digestion, the liquid fertilizer of preparation can be used for agriculture machine plant husbandry, can be agricultural produce 20%; Qualified discharge or comprehensive utilization after some employing bio-oxidation pond art breading;
3. the natural pond slag after separating directly is prepared into sludge organism carbon through natural pond slag carbonizing plant, and sludge organism carbon can be used for agricultural fertilizer, material for water treatment and soil improvement material etc.
The anaerobic digestion of municipal sludge of the present invention and the comprehensive utilization of carbonizing treatment, can realize minimizing, energy, Fertilizer Transformed and the resource utilization of municipal sludge, biogas production efficient is high, the natural pond liquid that produces and the natural pond slag can well be processed or again utilize, adopt complete mixing anaerobic digestion techniques to carry out sludge anaerobic and process, its gas production rate exceeds 5%～15% than general anaerobic digestion techniques; Adopt the internal heat type carbonizing apparatus to dispose the natural pond slag and prepare biological activated carbon, the processing unit floor space is little, and energy consumption is low; The bioactive carbon volume of producing is little, convenient transportation and storage; And be rich in N, P, K nutritive element, be widely used in the fields such as agricultural.
The description of drawings book
Fig. 1 is process flow sheet of the present invention
Embodiment
The invention will be further described below in conjunction with embodiment.In following examples, the device of main usefulness has German sharp Pu tank, High Temperature High Pressure internal heat type converter carbonizing plant and Cyclonic reactor, the tank body of described Germany sharp Pu tank adopts three-decker, outer is that compound flaggy, middle layer are that thermal insulation layer, internal layer are the stainless steel clad plate layer, be provided with Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system in Germany's sharp Pu tank, these devices all adopt existing technology; Described High Temperature High Pressure internal heat type converter carbonizing plant comprises inner converter, intermediate combustion chamber and outer hull, and adopts the reaction of electrically heated Starting mode high temperature cabonization; Described Cyclonic reactor adopts existing cyclone separator.
Embodiment one:
The concrete steps of the method for a kind of urban mud anaerobic digestion and carbonization comprehensive utilization are as follows successively:
(1) sludge conditioning: adopting first physics conditioning is that 300: 1 ratio is mixed and stirred evenly with mud and wood chip according to mass ratio, then add respectively 50.0mg/L chitosan, 3.0mg/L polyacrylamide and 150.0mg/L calcium hydroxide, make that moisture percentage in sewage sludge after the conditioning is 90%, carbon-nitrogen ratio is 15, pH is 6.8;
(2) the complete mixing anaerobic digestion of mud: will be transported in the tank of German sharp Pu by satisfactory mud after step (1) conditioning, the temperature of controlling in the tank of German sharp Pu by constant temperature fuzzy regulation system is 35 ℃, and transfer tank interior local temperature difference in German sharp Pu at ± 0.5 ℃, then be that the intermittent type mechanical whipping appts of 10～60r/min stirs the mud in the tank by being arranged on rotating speed in the tank of German sharp Pu, the biogas that Anaerobic Digestion is carried out producing afterwards anaerobic digestion solution in 15 days and contained methane 60%, after will containing the biogas dehydration of biogas process and biogas desulfurization processing of 60% methane, be stored in the biogas hold-up vessel, be used for generating, for plant area;
(3) Digestive system solid-liquid separation: will adopt Cyclonic reactor that the anaerobic digestion solution that produces in the step (2) is carried out solid-liquid separation, and isolate the natural pond slag of water ratio 60%, the natural pond liquid after the separation is as the raw material of fertilizer;
(4) natural pond slag carbonizing treatment: adopting the middle water ratio 60% natural pond slag that separates of wood chip and step (3) directly to be mixed to get water ratio according to 1: 4 ratio is 20% natural pond slag, be that 20% natural pond slag is transported in the High Temperature High Pressure internal heat type converter carbonizing plant again with water ratio, anaerobism or hypoxia response 10min, produce carbonization gas and sludge organism carbon, the carbonization gas that wherein produces after the reaction is directly sent into to burn away in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant by pipeline provides heat for carburizing reagent; In the reaction process: the temperature of reaction in the High Temperature High Pressure internal heat type converter carbonizing plant is that 800 ℃, pressure are 16Mpa.
Be 8% by implementing sludge organism carbon granules footpath 0.5mm, a water ratio that produces, filling proportion is 0.55g/cm
3, can be used for water treatment filter material.
Embodiment two:
The concrete steps of the method for a kind of urban mud anaerobic digestion and carbonization comprehensive utilization are as follows successively:
(1) sludge conditioning: add respectively 20mg/L chitosan and 150.0mg/L calcium hydroxide, make that moisture percentage in sewage sludge after the conditioning is 91%, pH is 7.0, carbon-nitrogen ratio is 12.
(2) the complete mixing anaerobic digestion of mud: will be transported in the tank of German sharp Pu by satisfactory mud after step (1) conditioning, the temperature of controlling in the tank of German sharp Pu by constant temperature fuzzy regulation system is 36 ℃, and regulate and control the interior local temperature difference of German sharp Pu tank at ± 0.5 ℃, then by being arranged on Pneumatic mixing device in the tank of German sharp Pu, mud in the tank is carried out pneumatic stirring, Anaerobic Digestion produced anaerobic digestion solution in 20 days and contains the biogas of methane 65%, after will containing the biogas dehydration of biogas process and biogas desulfurization processing of 65% methane, be stored in the biogas hold-up vessel, be used for generating, the residual heat recovery boiler is used for the sludge pretreatment heating;
(3) Digestive system solid-liquid separation: will adopt Cyclonic reactor that the anaerobic digestion solution that produces in the step (2) is carried out solid-liquid separation, and isolate the natural pond slag of water ratio 68%, qualified discharge after the natural pond liquid process bio-oxidation pond art breading after the separation;
(4) natural pond slag carbonizing treatment: adopting the middle water ratio 68% natural pond slag that separates of waste paper and step (3) directly to be mixed to get water ratio according to 1: 5 ratio is 25% natural pond slag, be that 25% natural pond slag is transported in the High Temperature High Pressure internal heat type converter carbonizing plant again with water ratio, anaerobism or hypoxia response 15min, produce carbonization gas and sludge organism carbon, in the reaction process: the temperature of reaction in the High Temperature High Pressure internal heat type converter carbonizing plant is that 600 ℃, pressure are 15.0Mpa.
Sludge organism carbon granules footpath 0.80mm, the water ratio that produces by embodiment two is 9.0%, filling proportion is 0.53g/cm
3, contain abundant N, P, K element, with the composite preparation solid organic fertilizer of natural pond liquid.
Embodiment three:
The concrete steps of the method for a kind of urban mud anaerobic digestion and carbonization comprehensive utilization are as follows successively:
(1) sludge conditioning: adopting the physics conditioning is that 200: 1 ratio is mixed and stirred evenly with mud and wood chip according to mass ratio, and making the moisture percentage in sewage sludge after the conditioning is 92%.
(2) the complete mixing anaerobic digestion of mud: will be transported in the tank of German sharp Pu by satisfactory mud after step (1) conditioning, the temperature of controlling in the tank of German sharp Pu by constant temperature fuzzy regulation system is 35.5 ℃, and regulate and control the interior local temperature difference of German sharp Pu tank at ± 0.5 ℃, then by being arranged on Pneumatic mixing device in the tank of German sharp Pu, mud in the tank is carried out the biogas stirring simultaneously with the intermittent type mechanical whipping appts and the intermittent type mechanical stirring makes the mud in the tank carry out 20 days Anaerobic Digestion, produce anaerobic digestion solution and the biogas that contains methane 60%, to contain the biogas of 60% methane through the biogas dehydration, after biogas desulfurization and the biogas carbonization treatment, be stored in the biogas hold-up vessel, be used for vehicle mounted gas; In the Anaerobic Digestion process: described gas stirring is to adopt biogas return stirring mode, and it is that to adopt rotating speed be the alr mode that the intermittent type mechanical whipping appts of 10～60r/min carries out that intermittent type mechanical stirs;
(3) Digestive system solid-liquid separation: will adopt Cyclonic reactor that the anaerobic digestion solution that produces in the step (2) is carried out solid-liquid separation, and isolate the natural pond slag of water ratio 55%, the natural pond liquid after the separation is as the raw material of fertilizer;
(4) natural pond slag carbonizing treatment: adopting the middle water ratio 55% natural pond slag that separates of waste paper and step (3) directly to be mixed to get water ratio according to 1: 3 ratio is 20% natural pond slag, be that 20% natural pond slag is transported in the High Temperature High Pressure internal heat type converter carbonizing plant again with water ratio, anaerobism or hypoxia response 12min, produce carbonization gas and sludge organism carbon, the carbonization gas that wherein produces after the reaction is directly sent into to burn away in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant by pipeline provides heat for carburizing reagent; In the reaction process: the temperature of reaction in the High Temperature High Pressure internal heat type converter carbonizing plant is that 750 ℃, pressure are 15Mpa.
Sludge organism carbon granules footpath 1.0mm, the water ratio that produces by embodiment three is 10%, filling proportion is 0.50g/cm
3, be used for material of construction.
Claims (5)
1. the method for a urban mud anaerobic digestion and carbonization comprehensive utilization is characterized in that the concrete steps of described technique are as follows successively:
(1) sludge conditioning: adopt physical method or chemical process or adopt first physical method to adopt again chemical process that mud is nursed one's health, make that moisture percentage in sewage sludge after the conditioning is 90～92%, carbon-nitrogen ratio is 10～20, pH is 6.5～7.5;
(2) the complete mixing anaerobic digestion of mud: will be transported in the complete mixing anaerobic digester by satisfactory mud after step (1) conditioning, the temperature of controlling in the complete mixing anaerobic digester is 35～37 ℃, and regulate and control the interior local temperature difference of complete mixing anaerobic digester at ± 0.5 ℃, then pass through pneumatic stirring, or intermittent type mechanical stirs, or carry out simultaneously pneumatic stirring and intermittent type mechanical and stir the mud make in the tank and mix, after carrying out Anaerobic Digestion 15-20 days, produce anaerobic digestion solution and the biogas that contains methane 60～70%, with the existing dehydration of biogas process that contains methane 60～70% that produces, collect in the tank for sewage gas for subsequent use after desulfurization and the carbonization treatment, in anaerobic digestion process: described pneumatic stirring is to adopt the biogas alr mode, and it is that to adopt rotating speed be the alr mode that the intermittent type mechanical whipping appts of 10～60r/min carries out that intermittent type mechanical stirs;
(3) Digestive system solid-liquid separation: adopt Cyclonic reactor that the anaerobic digestion solution that produces in the step (2) is carried out solid-liquid separation, isolate the natural pond slag of water ratio 50～70%, natural pond liquid after the separation is as the raw material of fertilizer, or qualified discharge and comprehensive utilization after the process bio-oxidation pond art breading;
(4) natural pond slag carbonizing treatment: adopting middle water ratio 50～70% natural pond slags that separate of wood chip or waste paper and step (3) directly to be mixed to get water ratio according to mass ratio 1: 3～10 ratios is 20～30% natural pond slag, be that 20～30% natural pond slag is transported in the High Temperature High Pressure internal heat type converter carbonizing plant again with water ratio, anaerobism or hypoxia response 10～20min, produce carbonization gas and sludge organism carbon, the carbonization gas that wherein produces after the reaction directly is transported in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant by pipeline and burns away, for carburizing reagent provides heat; In the reaction process: the temperature of reaction in the High Temperature High Pressure internal heat type converter carbonizing plant is that 600～800 ℃, pressure are 15.0～16.0Mpa.
A kind of urban mud anaerobic digestion according to claim 1 and carbonization the comprehensive utilization method, it is characterized in that: the conditioning of physics described in the step (1) is to add wood chip or waste paper in mud, and make its mud and wood chip or waste paper according to mass ratio 10～500: 1 ratio is mixed; Described chemical conditioning is to add arbitrarily several following materials of measuring in through the mud after the physics conditioning: 10.0～100.0mg/L chitosan, 1.0～10.0mg/L polyacrylamide and 20.0～150.0mg/L calcium hydroxide make the pH of mud reach 6.5～7.5.
A kind of urban mud anaerobic digestion according to claim 1 and carbonization the comprehensive utilization method, it is characterized in that: the complete mixing anaerobic digestion of the mud described in the step (2) is being carried out in the mixing anaerobic digester fully, the tank body of described complete mixing anaerobic digester adopts three-decker to consist of, outer for compound flaggy, middle layer are that thermal insulation layer, internal layer are the stainless steel clad plate layer, in the mixing anaerobic digester Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system are set fully.
A kind of urban mud anaerobic digestion according to claim 1 and carbonization the comprehensive utilization method, it is characterized in that: the natural pond slag carbonizing treatment described in the step (4) is carried out at High Temperature High Pressure internal heat type converter carbonizing plant, this carbonizing plant comprises inner converter, intermediate combustion chamber and outer hull, the natural pond slag is carried in the burner hearth of inner converter, adopt the reaction of electrically heated Starting mode high temperature cabonization, Formed oxidizing gases and biological carbon product; The carbonization gas that produces is ejected in the combustion chamber by spraying technique and burns, and provides heat for natural pond slag in the converter carries out carburizing reagent.
5. the method for a kind of urban mud anaerobic digestion according to claim 1 and carbonization comprehensive utilization is characterized in that: biological carbon particle diameter 0.5～1.0mm, the water ratio of preparation are 5～10% in the step (4), filling proportion is 0.50～0.55g/cm
3, contain N, P, K element.
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