CN105060669A - Sludge comprehensive utilization method by anaerobic fermentation-carbonization combination technique - Google Patents
Sludge comprehensive utilization method by anaerobic fermentation-carbonization combination technique Download PDFInfo
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- CN105060669A CN105060669A CN201510596942.5A CN201510596942A CN105060669A CN 105060669 A CN105060669 A CN 105060669A CN 201510596942 A CN201510596942 A CN 201510596942A CN 105060669 A CN105060669 A CN 105060669A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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Abstract
The invention discloses a sludge comprehensive utilization method by an anaerobic fermentation-carbonization combination technique, which comprises the following steps: sludge conditioning: conditioning the sludge by a physical process, or a chemical process, or a physical process and chemical process, or a chemical process and physical process; sludge mixed anaerobic digestion treatment: delivering the conditioned satisfactory sludge in the step 1) into a complete mixed anaerobic digestion tank to perform anaerobic digestion treatment; solid-liquid separation of digestion solution; and marsh slag carbonization: delivering wood dust or waste paper and the marsh slag with the water content of 55-85% separated in the step 3) into a high-temperature high-pressure internal-heating converter carbonizing plant, and carrying out anaerobic or anoxic reaction for 18-25 minutes to generate carbonization gas and sludge biological carbon. The municipal sludge is subjected to anaerobic digestion and carbonization to produce biogas and prepare sludge carbides, thereby implementing reduction, energy conversion and fertilizer preparation on the sludge, and finally achieving the goal of comprehensive utilization and recovery of the sludge.
Description
Technical field
The present invention relates to technical field of new energies, specifically, is the method that anaerobically fermenting and carbonizing treatment combined technology carry out comprehensive utilization of mud.
Background technology
In recent years, under national energy-saving reduction of discharging and pro-active fiscal policy effect, urban wastewater treatment is developed rapidly, and Urban Water environmental improvement obtains remarkable effect, along with improving constantly of China's urban wastewater treatment rate, urban wastewater treatment firm sludge yield also sharply increases.According to incompletely statistics, the treatment and disposal that current national urban wastewater treatment firm mud only has small portion to carry out in various degree, and major part is not carried out normalized process and is disposed.Mud contains the hazardous and noxious substances such as pathogenic agent, heavy metal and persistent organism, water ratio is very high, without effectively processing disposal, very easily secondary pollution is caused to underground water, soil etc., direct threatening environment safety and public health, the environmental benefit of sewage treatment facility is reduced greatly, affects the positively effect that national energy-saving reduces discharging strategy implementation.
The process of current domestic city mud mainly adopts landfill, anhydration and incineration, as mode process and disposal such as agriculture fertilizer; Landfill mud needs to take a large amount of agricultural arable land; The anhydration and incineration of mud, ubiquity construction investment is large, the problem that working cost is high, is difficult to economically support.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; After mesophilic digestion, the unwanted bacteria in mud obtains a large amount of eliminations, can realize innoxious and stabilization; The biogas that anaerobic digestion produces may be used for fuel and generating, and compensating the energy consumption of water factory, is industry energy conservation 30%, is one of the most feasible current sludge treatment technique, can realizes resource utilization and energy-saving.
But the current sludge anaerobic treatment process used, exists state of the art low, sludge treatment weak effect, biogas utilization rate is low waits series of problems.And sludge anaerobic treatment process, except producing biogas, also can produce natural pond slag; Existing natural pond slag disposing technique major part adopts composting technology to prepare fertilizer, but this technique needs a large amount of land resources, and in developed regions, application is restricted.
Summary of the invention
The object of the invention is to design the method that anaerobically fermenting and carbonizing treatment combined technology carry out comprehensive utilization of mud, solve the deficiency of existing anaerobically digested sludge process, adopt the treatment technology that anaerobically fermenting combines with carbonizing treatment, to urban mud anaerobic digestion and carbonizing treatment, produce biogas and prepare mud carbide, realize the minimizing of mud, energy, Fertilizer Transformed, finally reach the comprehensive utilization of resources of mud.
The present invention is achieved through the following technical solutions: anaerobically fermenting and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, comprises following concrete technology step:
1) nurse one's health mud: adopt physical method or chemical process or first adopt physical method to adopt chemical process again or first adopt chemical process to adopt physical method to nurse one's health mud again, make that the moisture percentage in sewage sludge after conditioning is 93 ~ 95%, carbon-nitrogen ratio is 12 ~ 18, pH is 6.7 ~ 7.4; Wherein said physical method is in mud, add wood chip or waste paper, and its mud is mixed according to the ratio of mass ratio 100 ~ 450:1 with wood chip or waste paper; Described chemical process is in mud, add 15.0 ~ 90.0mg/L chitosan and 30.0 ~ 120.0mg/L calcium hydroxide simultaneously, or add 30.0 ~ 80.0mg/L chitosan, 30.0 ~ 120.0mg/L calcium hydroxide and 2.0 ~ 8.0mg/L polyacrylamide simultaneously, make the pH of mud reach 6.7 ~ 7.4;
2) mud mixing anaerobic digestion process: will be transported in complete mixing anaerobic digester by satisfactory mud after step 1) conditioning, the temperature controlled in complete mixing anaerobic digester is 38 ~ 40 DEG C, and to regulate and control in complete mixing anaerobic digester local temperature difference at ± 0.5 DEG C, then pneumatic stirring is passed through, or intermittent type mechanical stirs, or carry out pneumatic stirring and intermittent type mechanical simultaneously and stir the mud in tank is mixed, after carrying out Anaerobic Digestion 16-19 days, produce anaerobic digestion solution and the biogas containing methane 62 ~ 68%, by the biogas containing methane 62 ~ 68% of generation through existing dehydration, collect in tank for sewage gas for subsequent use after desulfurization and carbonization treatment, in anaerobic digestion process: described pneumatic stirring adopts biogas alr mode, it is adopt rotating speed to be the alr mode that the intermittent type mechanical whipping appts of 15 ~ 55r/min carries out that intermittent type mechanical stirs,
3) Digestive system solid-liquid separation: adopt Cyclonic reactor to step 2) in produce anaerobic digestion solution carry out solid-liquid separation, isolate the natural pond slag of water ratio 55 ~ 85%, natural pond liquid after separation is as the raw material of fertilizer, or qualified discharge and comprehensive utilization after bio-oxidation pond art breading;
4) natural pond slag carbonizing treatment: adopt wood chip or waste paper to be directly mixed to get according to mass ratio 1:5 ~ 15 ratio the natural pond slag that water ratio is 22 ~ 28% with water ratio 55 ~ 85% natural pond slag be separated in step 3), by water ratio be again 22 ~ 28% natural pond slag be transported in High Temperature High Pressure internal heat type converter carbonizing plant, anaerobism or hypoxia response 18 ~ 25min, produce carbonization gas and sludge organism carbon, the carbonization gas wherein produced after reaction is directly burnt away, for carburizing reagent provides heat in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant by Cemented filling; In reaction process: the temperature of reaction in High Temperature High Pressure internal heat type converter carbonizing plant is 650 ~ 750 DEG C, pressure is 16.5 ~ 18.5Mpa.
Further to better implement the present invention, step 2) described in mud mixing anaerobic digestion process carry out in complete mixing anaerobic digester, the tank body of described complete mixing anaerobic digester adopts three-decker to form, skin is compound flaggy, middle layer is thermal insulation layer, internal layer is stainless steel clad plate layer, arranges Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system in complete mixing anaerobic digester.
Further to better implement the present invention, natural pond slag carbonizing treatment described in step 4) is carried out at High Temperature High Pressure internal heat type converter carbonizing plant, described High Temperature High Pressure internal heat type converter carbonizing plant comprises inner converter, intermediate combustion room and outer hull, 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 produced is ejected in combustion chamber by spraying technique and burns, and provides heat for natural pond slag in converter carries out carburizing reagent.
Further to better implement the present invention, the sludge organism carbon granules footpath 0.6 ~ 0.8mm prepared in described step 4), water ratio are 6 ~ 8%, filling proportion is 0.52 ~ 0.54g/cm
3, containing N, P, K element.
The present invention compared with prior art, has the following advantages and beneficial effect:
The present invention realizes the minimizing of municipal sludge, energy, Fertilizer Transformed and recycling treatment, biogas production efficiency is high, the natural pond liquid produced and natural pond slag can well process or again utilize, adopt complete mixing anaerobic digestion techniques to carry out sludge anaerobic process, its gas production rate exceeds 5% ~ 15% than general anaerobic digestion techniques; Adopt internal heat type carbonizing apparatus to dispose natural pond slag and prepare biological activated carbon, processing unit floor space is little, and energy consumption is low; The bioactive carbon volume produced is little, convenient transport and storage; And be rich in N, P, K nutritive element, be widely used in the fields such as agricultural.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
Anaerobically fermenting and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, comprise following concrete technology step:
1) nurse one's health mud: adopt physical method or chemical process or first adopt physical method to adopt chemical process again or first adopt chemical process to adopt physical method to nurse one's health mud again, make that the moisture percentage in sewage sludge after conditioning is 93 ~ 95%, carbon-nitrogen ratio is 12 ~ 18, pH is 6.7 ~ 7.4; Wherein said physical method is in mud, add wood chip or waste paper, and its mud is mixed according to the ratio of mass ratio 100 ~ 450:1 with wood chip or waste paper; Described chemical process is in mud, add 15.0 ~ 90.0mg/L chitosan and 30.0 ~ 120.0mg/L calcium hydroxide simultaneously, or add 30.0 ~ 80.0mg/L chitosan, 30.0 ~ 120.0mg/L calcium hydroxide and 2.0 ~ 8.0mg/L polyacrylamide simultaneously, make the pH of mud reach 6.7 ~ 7.4;
2) mud mixing anaerobic digestion process: will be transported in complete mixing anaerobic digester by satisfactory mud after step 1) conditioning, the temperature controlled in complete mixing anaerobic digester is 38 ~ 40 DEG C, and to regulate and control in complete mixing anaerobic digester local temperature difference at ± 0.5 DEG C, then pneumatic stirring is passed through, or intermittent type mechanical stirs, or carry out pneumatic stirring and intermittent type mechanical simultaneously and stir the mud in tank is mixed, after carrying out Anaerobic Digestion 16-19 days, produce anaerobic digestion solution and the biogas containing methane 62 ~ 68%, by the biogas containing methane 62 ~ 68% of generation through existing dehydration, collect in tank for sewage gas for subsequent use after desulfurization and carbonization treatment, in anaerobic digestion process: described pneumatic stirring adopts biogas alr mode, it is adopt rotating speed to be the alr mode that the intermittent type mechanical whipping appts of 15 ~ 55r/min carries out that intermittent type mechanical stirs,
3) Digestive system solid-liquid separation: adopt Cyclonic reactor to step 2) in produce anaerobic digestion solution carry out solid-liquid separation, isolate the natural pond slag of water ratio 55 ~ 85%, natural pond liquid after separation is as the raw material of fertilizer, or qualified discharge and comprehensive utilization after bio-oxidation pond art breading;
4) natural pond slag carbonizing treatment: adopt wood chip or waste paper to be directly mixed to get according to mass ratio 1:5 ~ 15 ratio the natural pond slag that water ratio is 22 ~ 28% with water ratio 55 ~ 85% natural pond slag be separated in step 3), by water ratio be again 22 ~ 28% natural pond slag be transported in High Temperature High Pressure internal heat type converter carbonizing plant, anaerobism or hypoxia response 18 ~ 25min, produce carbonization gas and sludge organism carbon, the carbonization gas wherein produced after reaction is directly burnt away, for carburizing reagent provides heat in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant by Cemented filling; In reaction process: the temperature of reaction in High Temperature High Pressure internal heat type converter carbonizing plant is 650 ~ 750 DEG C, pressure is 16.5 ~ 18.5Mpa.
Embodiment 2:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, step 2) described in mud mixing anaerobic digestion process carry out in complete mixing anaerobic digester, the tank body of described complete mixing anaerobic digester adopts three-decker to form, skin is compound flaggy, middle layer is thermal insulation layer, internal layer is stainless steel clad plate layer, arranges Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system in complete mixing anaerobic digester.
Embodiment 3:
The present embodiment is at the enterprising one-step optimization in the basis of above-mentioned any embodiment, further to better implement the present invention, natural pond slag carbonizing treatment described in step 4) is carried out at High Temperature High Pressure internal heat type converter carbonizing plant, described High Temperature High Pressure internal heat type converter carbonizing plant comprises inner converter, intermediate combustion room and outer hull, 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 produced is ejected in combustion chamber by spraying technique and burns, and provides heat for natural pond slag in converter carries out carburizing reagent.
Embodiment 4:
The present embodiment is at the enterprising one-step optimization in the basis of above-mentioned any embodiment, and further to better implement the present invention, the sludge organism carbon granules footpath 0.6 ~ 0.8mm prepared in described step 4), water ratio are 6 ~ 8%, filling proportion is 0.52 ~ 0.54g/cm
3, containing N, P, K element.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (5)
1. anaerobically fermenting and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, it is characterized in that: comprise following concrete technology step:
1) nurse one's health mud: adopt physical method or chemical process or first adopt physical method to adopt chemical process again or first adopt chemical process to adopt physical method to nurse one's health mud again, make that the moisture percentage in sewage sludge after conditioning is 93 ~ 95%, carbon-nitrogen ratio is 12 ~ 18, pH is 6.7 ~ 7.4; Wherein said physical method is in mud, add wood chip or waste paper, and its mud is mixed according to the ratio of mass ratio 100 ~ 450:1 with wood chip or waste paper; Described chemical process is in mud, add 15.0 ~ 90.0mg/L chitosan and 30.0 ~ 120.0mg/L calcium hydroxide simultaneously, or add 30.0 ~ 80.0mg/L chitosan, 30.0 ~ 120.0mg/L calcium hydroxide and 2.0 ~ 8.0mg/L polyacrylamide simultaneously, make the pH of mud reach 6.7 ~ 7.4;
2) mud mixing anaerobic digestion process: will be transported in complete mixing anaerobic digester by satisfactory mud after step 1) conditioning, the temperature controlled in complete mixing anaerobic digester is 38 ~ 40 DEG C, and to regulate and control in complete mixing anaerobic digester local temperature difference at ± 0.5 DEG C, then pneumatic stirring is passed through, or intermittent type mechanical stirs, or carry out pneumatic stirring and intermittent type mechanical simultaneously and stir the mud in tank is mixed, after carrying out Anaerobic Digestion 16-19 days, produce anaerobic digestion solution and the biogas containing methane 62 ~ 68%, by the biogas containing methane 62 ~ 68% of generation through existing dehydration, collect in tank for sewage gas for subsequent use after desulfurization and carbonization treatment, in anaerobic digestion process: described pneumatic stirring adopts biogas alr mode, it is adopt rotating speed to be the alr mode that the intermittent type mechanical whipping appts of 15 ~ 55r/min carries out that intermittent type mechanical stirs,
3) Digestive system solid-liquid separation: adopt Cyclonic reactor to step 2) in produce anaerobic digestion solution carry out solid-liquid separation, isolate the natural pond slag of water ratio 55 ~ 85%, natural pond liquid after separation is as the raw material of fertilizer, or qualified discharge and comprehensive utilization after bio-oxidation pond art breading;
4) natural pond slag carbonizing treatment: adopt wood chip or waste paper to be directly mixed to get according to mass ratio 1:5 ~ 15 ratio the natural pond slag that water ratio is 22 ~ 28% with water ratio 55 ~ 85% natural pond slag be separated in step 3), by water ratio be again 22 ~ 28% natural pond slag be transported in High Temperature High Pressure internal heat type converter carbonizing plant, anaerobism or hypoxia response 18 ~ 25min, produce carbonization gas and sludge organism carbon, the carbonization gas wherein produced after reaction is directly burnt away, for carburizing reagent provides heat in the combustion chamber of High Temperature High Pressure internal heat type converter carbonizing plant by Cemented filling; In reaction process: the temperature of reaction in High Temperature High Pressure internal heat type converter carbonizing plant is 650 ~ 750 DEG C, pressure is 16.5 ~ 18.5Mpa.
2. anaerobically fermenting according to claim 1 and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, it is characterized in that: step 2) described in mud mixing anaerobic digestion process carry out in complete mixing anaerobic digester, the tank body of described complete mixing anaerobic digester adopts three-decker to form, skin is compound flaggy, middle layer is thermal insulation layer, internal layer is stainless steel clad plate layer, arranges Pneumatic mixing device, intermittent type mechanical whipping appts and constant temperature fuzzy regulation system in complete mixing anaerobic digester.
3. anaerobically fermenting according to claim 1 and 2 and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, it is characterized in that: the natural pond slag carbonizing treatment described in step 4) is carried out at High Temperature High Pressure internal heat type converter carbonizing plant, described High Temperature High Pressure internal heat type converter carbonizing plant comprises inner converter, intermediate combustion room and outer hull, 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 produced is ejected in combustion chamber by spraying technique and burns, and provides heat for natural pond slag in converter carries out carburizing reagent.
4. anaerobically fermenting according to claim 3 and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, it is characterized in that: the sludge organism carbon granules footpath 0.6 ~ 0.8mm prepared in described step 4), water ratio are 6 ~ 8%, filling proportion is 0.52 ~ 0.54g/cm
3, containing N, P, K element.
5. anaerobically fermenting according to claim 1 and 2 and carbonizing treatment combined technology carry out the method for comprehensive utilization of mud, it is characterized in that: the sludge organism carbon granules footpath 0.6 ~ 0.8mm prepared in described step 4), water ratio are 6 ~ 8%, filling proportion is 0.52 ~ 0.54g/cm
3, containing N, P, K element.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107487982A (en) * | 2017-09-22 | 2017-12-19 | 兴源环境科技股份有限公司 | A kind of feces of livestock and poultry desiccation conditioning medicament and desiccation dewatering process |
| CN110235742A (en) * | 2019-06-17 | 2019-09-17 | 上海大学 | A method of green plants matrix is prepared using sludge biogas residue |
| CN110386748A (en) * | 2019-08-21 | 2019-10-29 | 四川锐源能环科技有限公司 | A kind of sewage plant sludge harmless resource processing system and the method for producing humic acid |
| CN110698014A (en) * | 2019-11-06 | 2020-01-17 | 重庆大雨水生态科技有限公司 | Harmless treatment process for domestic sludge |
| CN110835220A (en) * | 2019-11-28 | 2020-02-25 | 天津凯英科技发展股份有限公司 | Sludge anaerobic digestion method and application |
| US11124461B2 (en) | 2019-07-04 | 2021-09-21 | Incitec Pivot Limited | Fertilizer |
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| CN102992559A (en) * | 2012-12-07 | 2013-03-27 | 中船重工环境工程有限公司 | Method for comprehensively utilizing anaerobic digestion and carbonization of municipal sludge |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107487982A (en) * | 2017-09-22 | 2017-12-19 | 兴源环境科技股份有限公司 | A kind of feces of livestock and poultry desiccation conditioning medicament and desiccation dewatering process |
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| US11124461B2 (en) | 2019-07-04 | 2021-09-21 | Incitec Pivot Limited | Fertilizer |
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| CN110835220A (en) * | 2019-11-28 | 2020-02-25 | 天津凯英科技发展股份有限公司 | Sludge anaerobic digestion method and application |
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Application publication date: 20151118 |