CN114106836A - Sludge carbonization product as soil conditioner - Google Patents
Sludge carbonization product as soil conditioner Download PDFInfo
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- CN114106836A CN114106836A CN202111584652.0A CN202111584652A CN114106836A CN 114106836 A CN114106836 A CN 114106836A CN 202111584652 A CN202111584652 A CN 202111584652A CN 114106836 A CN114106836 A CN 114106836A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Environmental Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of soil improvement agents, in particular to a sludge carbonization product as a soil improvement agent, which comprises the steps of adding 10-16% of sludge coal into a common organic fertilizer, uniformly stirring, and applying into ploughed soil for planting; applying common organic fertilizer as base fertilizer in the ploughed soil according to the instructions, applying sludge charcoal in the proportion of 0.3-0.5 kg per square of the soil area, and ploughing uniformly for planting; the product can improve the pH value of soil through carbonization, has the functions of preserving water and fertilizer, improving the microbial characteristics of soil and the like, can be used for preparing soil conditioners and biochar-based fertilizers, and has the alkaline property: the pH value and the organic matter content of the soil can be improved, a microenvironment suitable for the growth of microorganisms is provided, and the physical and chemical properties of the soil are improved; the heavy metal is solidified: after dehydration and pyrolysis, heavy metals Cu, Zn, Cr, Ni and Pb in the sludge are mainly enriched in the sludge, and the sludge mainly takes a residue state and an oxidation state, so that the leaching property is low, and the safety is good.
Description
Technical Field
The invention relates to the technical field of soil conditioners, in particular to a sludge carbonization product used as a soil conditioner.
Background
In order to improve the pH value and the organic matter content of the soil, provide a microenvironment suitable for the growth of microorganisms and improve the physical and chemical properties of the soil; promoting the growth of bacteria and some functional bacteria in the soil; effectively reduces the content of Polycyclic Aromatic Hydrocarbons (PAHs) in the soil, improves the microbial characteristics of the soil and the like, thereby providing a sludge carbonization product as a soil conditioner.
Disclosure of Invention
The invention aims to provide a sludge carbonization product as a soil conditioner to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a sludge carbonization product as a soil conditioner comprises the following steps:
s1, conveying the sludge into a sludge dryer through a conveyor, fully scattering, crushing and throwing the sludge through a shoveling plate and a scattering mechanism arranged in the dryer, fully contacting the sludge with high-temperature flue gas entering in a concurrent or countercurrent manner, comprehensively utilizing heat transfer modes of conduction, convection and radiation to improve heat exchange efficiency, rapidly reducing the water content of the sludge to be below 20%, and discharging the dried sludge from the tail end of the dryer; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeder of a sludge carbonization furnace, and introducing evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
s2, the sludge carbonization furnace feeder feeds the dried sludge with the moisture content of less than 20% into a central barrel of the sludge carbonization furnace, the inner barrel slowly rotates to push the sludge to move forward, and conducts and radiates heat exchange with the barrel wall, the sludge is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis and carbonization, the generated sludge coal is discharged from the tail end of the carbonization furnace, and the sludge coal is cooled to 25-45 ℃ by a cooling device and then is fed into a carbonization material bin;
s3, modification of sludge carbonization products: the phosphorus content in the discharged water is reduced by modifying the adsorbent used for sewage treatment;
s4, adding 10-16% of peat into the common organic fertilizer, uniformly stirring, and applying into the ploughed soil for planting;
s5, applying common organic fertilizer as a base fertilizer into the ploughed soil according to the use instruction, applying sludge charcoal according to the proportion of 0.3-0.5 kg per square of the soil area, and ploughing uniformly for planting.
In a preferable embodiment of the invention, the pore diameter of the sludge carbonization product is about 3-5nm, and the specific surface area is about 40-50m 2/g.
As a preferable scheme of the invention, the sludge is sent into a central cylinder of a sludge carbonization furnace, is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis carbonization, is cooled to 25-45 ℃ by a cooling device, and is sent into a carbonization material bin.
As a preferable scheme of the invention, the adsorption capacity of the sludge carbon modified by the sludge carbonization product to phosphorus reaches 10 mg-P/g-.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, the product obtained by carbonizing sludge has alkaline property: the pH value and the organic matter content of the soil can be improved, a microenvironment suitable for the growth of microorganisms is provided, and the physical and chemical properties of the soil are improved; the porous nature promotes the growth of bacteria and certain functional bacteria in the soil: the carbon-nitrogen ratio (C/N) of the sludge carbon is high, a large amount of carbon compounds which are difficult to degrade are contained, the growth of soil fungi is facilitated, and the sludge carbon has larger porosity and provides attachment sites for fungal hyphae; the soil enzyme activities of dehydrogenase, urease, beta-glucosidase and the like in the soil are indirectly improved through the promotion effect of the peat on microorganisms; contains the nutrient substances such as nitrogen, phosphorus, potassium and the like: in the sludge carbonization process, the total nitrogen content in the sludge is reduced, but the nitrogen content is still 60wt% at the temperature of 600 ℃; phosphorus and potassium are basically all remained in the peat at the temperature of below 600 ℃ and can provide nutrient elements for plants; the heavy metal is solidified: after dehydration and pyrolysis, heavy metals Cu, Zn, Cr, Ni and Pb in the sludge are mainly enriched in the sludge, and the sludge mainly takes a residue state and an oxidation state, so that the leaching property is low, and the safety is good; the peat can effectively reduce the content of Polycyclic Aromatic Hydrocarbons (PAHs) in soil, and has obvious effect of reducing the effective states of heavy metals Cd, Cu and Zn.
2. In the invention, the carbonized product can improve the pH value of soil, has the functions of preserving water and fertilizer, improving the microbial characteristics of soil and the like, has the aperture of about 3-5nm, the specific surface area of about 40-50m2/g, certain adsorbability, the adsorption rate to phenol is about more than 10-12 percent, and the adsorption rate to carbon tetrachloride is more than 2 percent.
Drawings
FIG. 1 is a schematic diagram showing the soil treatment before and after the soil treatment according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a sludge carbonization product as a soil conditioner comprises the following steps:
s1, conveying the sludge into a sludge dryer through a conveyor, fully scattering, crushing and throwing the sludge through a shoveling plate and a scattering mechanism arranged in the dryer, fully contacting the sludge with high-temperature flue gas entering in a concurrent or countercurrent manner, comprehensively utilizing heat transfer modes of conduction, convection and radiation to improve heat exchange efficiency, rapidly reducing the water content of the sludge to be below 20%, and discharging the dried sludge from the tail end of the dryer; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeder of a sludge carbonization furnace, and introducing evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
s2, the sludge carbonization furnace feeder feeds the dried sludge with the moisture content of less than 20% into a central barrel of the sludge carbonization furnace, the inner barrel slowly rotates to push the sludge to move forward, and conducts and radiates heat exchange with the barrel wall, the sludge is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis and carbonization, the generated sludge coal is discharged from the tail end of the carbonization furnace, and the sludge coal is cooled to 25-45 ℃ by a cooling device and then is fed into a carbonization material bin;
s3, modification of sludge carbonization products: the phosphorus content in the discharged water is reduced by modifying the adsorbent used for sewage treatment;
s4, adding 10-16% of peat into the common organic fertilizer, uniformly stirring, and applying into the ploughed soil for planting;
s5, applying common organic fertilizer as a base fertilizer into the ploughed soil according to the use instruction, applying sludge charcoal according to the proportion of 0.3-0.5 kg per square of the soil area, and ploughing uniformly for planting.
The aperture of the sludge carbonization product is about 3-5nm, and the specific surface area is about 40-50m 2/g.
The sludge is sent into a central cylinder of a sludge carbonization furnace, is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis and carbonization, is cooled to 25-45 ℃ by a cooling device, and is sent into a carbonization material bin.
The adsorption capacity of the sludge carbon modified by the sludge carbonization product to phosphorus reaches 10 mg-P/g-.
Example (b): the method comprises the following steps of (1) conveying sludge into a sludge dryer by a conveyor, fully scattering, crushing and throwing the sludge by a shoveling plate and a scattering mechanism arranged in the dryer, fully contacting the sludge with high-temperature flue gas entering in a concurrent flow or a countercurrent flow, comprehensively utilizing heat transfer modes of conduction, convection and radiation to improve heat exchange efficiency, rapidly reducing the water content of the sludge to be below 20%, and discharging the dried sludge from the tail end of the dryer; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeder of a sludge carbonization furnace, and introducing evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
the method comprises the following steps that sludge with the moisture content of less than 20% after drying is sent into a central barrel of the sludge carbonization furnace by a sludge carbonization furnace feeder, an inner barrel slowly rotates to push the sludge to move forwards and conduct and radiate heat exchange with the barrel wall, the sludge is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state to be pyrolyzed and carbonized, the generated sludge coal is discharged from the tail end of the carbonization furnace, and the sludge coal is cooled to 25-45 ℃ by a cooling device and then sent into a carbonization material bin;
in the carbonization process of the sludge, along with the increase of the carbonization temperature, organic matters in the sludge are decomposed, nutrient elements such as nitrogen, phosphorus, potassium and the like are reserved, and heavy metals are solidified; due to the evaporation of water and the volatilization of decomposed gas, a plurality of small holes are formed on the surface and inside, and finally a carbonized product rich in fixed carbon is formed;
through detection, the aperture of the sludge carbonization product is about 3-5nm, the specific surface area is about 40-50m2/g, and the product has certain adsorbability, the adsorption rate to phenol is about more than 10% -12%, and the adsorption rate to carbon tetrachloride is more than 2%;
the use method 1: adding 10-16% of peat into common organic fertilizer, uniformly stirring, and applying into the ploughed soil for planting;
the use method 2: applying common organic fertilizer as base fertilizer in the ploughed soil according to the instructions, applying sludge charcoal in the proportion of 0.3-0.5 kg per square of the soil area, and ploughing uniformly for planting;
the product obtained by sludge carbonization has alkaline properties: the pH value and the organic matter content of the soil can be improved, a microenvironment suitable for the growth of microorganisms is provided, and the physical and chemical properties of the soil are improved; the porous nature promotes the growth of bacteria and certain functional bacteria in the soil: the carbon-nitrogen ratio (C/N) of the sludge carbon is high, a large amount of carbon compounds which are difficult to degrade are contained, the growth of soil fungi is facilitated, and the sludge carbon has larger porosity and provides attachment sites for fungal hyphae; the soil enzyme activities of dehydrogenase, urease, beta-glucosidase and the like in the soil are indirectly improved through the promotion effect of the peat on microorganisms; contains the nutrient substances such as nitrogen, phosphorus, potassium and the like: in the sludge carbonization process, the total nitrogen content in the sludge is reduced, but the nitrogen content is still 60wt% at the temperature of 600 ℃; phosphorus and potassium are basically all remained in the peat at the temperature of below 600 ℃ and can provide nutrient elements for plants; the heavy metal is solidified: after dehydration and pyrolysis, heavy metals Cu, Zn, Cr, Ni and Pb in the sludge are mainly enriched in the sludge, and the sludge mainly takes a residue state and an oxidation state, so that the leaching property is low, and the safety is good; the peat can effectively reduce the content of Polycyclic Aromatic Hydrocarbons (PAHs) in soil, and has obvious effect of reducing the effective states of heavy metals Cd, Cu and Zn;
the carbonized product can improve the pH value of soil, has the functions of preserving water and fertilizer, improving the microbial characteristics of soil and the like, has the aperture of about 3-5nm, the specific surface area of about 40-50m2/g, certain adsorbability, the adsorption rate to phenol is about more than 10-12 percent, and the adsorption rate to carbon tetrachloride is more than 2 percent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A sludge carbonization product as a soil conditioner is characterized in that: the method comprises the following steps:
s1, conveying the sludge into a sludge dryer through a conveyor, fully scattering, crushing and throwing the sludge through a shoveling plate and a scattering mechanism arranged in the dryer, fully contacting the sludge with high-temperature flue gas entering in a concurrent or countercurrent manner, comprehensively utilizing heat transfer modes of conduction, convection and radiation to improve heat exchange efficiency, rapidly reducing the water content of the sludge to be below 20%, and discharging the dried sludge from the tail end of the dryer; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeder of a sludge carbonization furnace, and introducing evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
s2, the sludge carbonization furnace feeder feeds the dried sludge with the moisture content of less than 20% into a central barrel of the sludge carbonization furnace, the inner barrel slowly rotates to push the sludge to move forward, and conducts and radiates heat exchange with the barrel wall, the sludge is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis and carbonization, the generated sludge coal is discharged from the tail end of the carbonization furnace, and the sludge coal is cooled to 25-45 ℃ by a cooling device and then is fed into a carbonization material bin;
s3, modification of sludge carbonization products: the phosphorus content in the discharged water is reduced by modifying the adsorbent used for sewage treatment;
s4, adding 10-16% of peat into the common organic fertilizer, uniformly stirring, and applying into the ploughed soil for planting;
s5, applying common organic fertilizer as a base fertilizer into the ploughed soil according to the use instruction, applying sludge charcoal according to the proportion of 0.3-0.5 kg per square of the soil area, and ploughing uniformly for planting.
2. A sludge carbonization product as a soil conditioner in accordance with claim 1, characterized in that: the aperture of the sludge carbonization product is about 3-5nm, and the specific surface area is about 40-50m 2/g.
3. A sludge carbonization product as a soil conditioner in accordance with claim 1, characterized in that: the sludge is sent into a central cylinder of a sludge carbonization furnace, is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis carbonization, is cooled to 25-45 ℃ by a cooling device, and is sent into a carbonization material bin.
4. A sludge carbonization product as a soil conditioner in accordance with claim 1, characterized in that: the adsorption capacity of the sludge carbon modified by the sludge carbonization product to phosphorus reaches 10 mg-P/g-.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110981631A (en) * | 2019-12-19 | 2020-04-10 | 天津环科立嘉环境修复科技有限公司 | Soil improvement method and application thereof |
| CN112592225A (en) * | 2020-12-14 | 2021-04-02 | 杭州师范大学 | Manufacturing method for producing carbon-based fertilizer based on river sediment carbonization |
| CN112919754A (en) * | 2021-01-21 | 2021-06-08 | 东南大学 | Method for preparing biochar and solidifying heavy metal by virtue of pyrolysis of sludge coupled biomass |
-
2021
- 2021-12-23 CN CN202111584652.0A patent/CN114106836A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106833657A (en) * | 2016-11-29 | 2017-06-13 | 中冶华天工程技术有限公司 | Combined contamination soil renovation agent and application process |
| CN108249720A (en) * | 2018-03-13 | 2018-07-06 | 山东金孚环境工程有限公司 | A kind of method that mechanical dehydration coupling desiccation pyrolysis prepares sludge carbon |
| CN110981631A (en) * | 2019-12-19 | 2020-04-10 | 天津环科立嘉环境修复科技有限公司 | Soil improvement method and application thereof |
| CN112592225A (en) * | 2020-12-14 | 2021-04-02 | 杭州师范大学 | Manufacturing method for producing carbon-based fertilizer based on river sediment carbonization |
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