CN112358335A - Method for carbonizing surface of sludge compost wood conditioner - Google Patents
Method for carbonizing surface of sludge compost wood conditioner Download PDFInfo
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- CN112358335A CN112358335A CN202011249602.2A CN202011249602A CN112358335A CN 112358335 A CN112358335 A CN 112358335A CN 202011249602 A CN202011249602 A CN 202011249602A CN 112358335 A CN112358335 A CN 112358335A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/20—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation using specific microorganisms or substances, e.g. enzymes, for activating or stimulating the treatment
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- C—CHEMISTRY; METALLURGY
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
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- 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
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- 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
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Abstract
The application discloses a method for carbonizing the surface of a wood conditioner for sludge compost, which belongs to the technical field of biochemical treatment of sludge and comprises the following steps: (1) preparing a sodium hydroxide solution with the mass fraction of 12-15%, and then completely soaking the wood conditioner in the sodium hydroxide solution; (2) putting the wood conditioner treated in the step (1) into a drying kiln, and drying the wood conditioner to 20-24% of water content at the temperature of 70-75 ℃ for later use; (3) continuing drying the wood conditioner treated in the step (2), and keeping the temperature in the drying kiln at 130-150 ℃; (4) putting the wood conditioner dried in the step (3) into a high-temperature pressure forming machine for hot pressing, wherein the hot pressing temperature is 210-220 ℃; (5) and (4) after the carbonization treatment in the step (4), placing the wood conditioner in a room temperature environment, and cooling the wood conditioner in a steam spraying mode. The surface components of the carbonized wood conditioner change, and the charcoal structure is not easy to consume oxygen and decompose.
Description
Technical Field
The invention belongs to the technical field of biochemical treatment of sludge, and particularly relates to a method for carbonizing the surface of a wood conditioner in sludge compost.
Background
About 3000 million tons of sludge with water content of about 80% are generated in cities in China every year, how to reasonably treat the sludge is to avoid secondary pollution is the key point of environmental protection work in China. Wherein the high-temperature aerobic composting process of the sludge is one of the widely applied methods. A high-temperature aerobic composting process for sludge is a method for converting organic matters in sludge into stable humus by utilizing microorganisms which are already available or artificially cultured in nature, and is a biochemical process. However, the sludge cannot be directly composted, and the sludge cannot meet the physicochemical conditions required by the composting due to high water content and low porosity, so some conditioners are required to be added to improve the sludge composting process.
The traditional conditioners such as sawdust, straws and the like are easy to decompose in the composting process and need to consume extra oxygen, and the performance of a supporting pore structure is reduced along with the composting process, so that the phenomenon of collapsing and compacting is obvious, and the mass transfer efficiency is reduced. The anaerobic acidification problem is easy to occur in the sludge composting process, the activity of microorganisms can be obviously reduced in an acidic environment, and the composting period is prolonged.
Disclosure of Invention
The invention aims to provide a method for carbonizing the surface of a wood conditioner in sludge composting, so as to solve the problems that the wood conditioner is easy to decompose and consumes additional oxygen in the composting process.
The method for carbonizing the surface of the sludge compost wood conditioner comprises the following steps:
(1) pretreatment: preparing a sodium hydroxide solution with the mass fraction of 12-15%, and then completely soaking the wood conditioner in the sodium hydroxide solution;
(2) primary drying treatment: putting the wood conditioner treated in the step (1) into a drying kiln, and drying the wood conditioner to 20-24% of water content at the temperature of 70-75 ℃ for later use;
(3) secondary drying treatment: continuing drying the wood conditioner treated in the step (2), and keeping the temperature in the drying kiln at 130-150 ℃;
(4) carbonizing treatment: putting the wood conditioner dried in the step (3) into a high-temperature pressure forming machine for hot pressing, wherein the hot pressing temperature is 210-220 ℃;
(5) quenching and tempering: and (4) after the carbonization treatment in the step (4), placing the wood conditioner in a room temperature environment, and cooling the wood conditioner in a steam spraying mode.
Preferably, the wood conditioner is a hardwood board made of white pine.
Preferably, the soaking time of the wood conditioner in the step (1) is 110-120 min.
Preferably, the temperature of the sodium hydroxide solution in the step (1) is 90-95 ℃.
Preferably, the wood conditioner in the step (1) is soaked in a sealed container.
Preferably, the wood conditioner is treated by applying ultrasonic waves with the frequency of 60-65KHz while the wood conditioner is dried in the step (3) until the water content of the wood conditioner is dried to 4-5%.
Preferably, the high-temperature pressure forming machine in the step (4) adopts an XLB-DH series lower cylinder type high-temperature hot-pressing forming machine.
The invention has the beneficial effects that: the sodium hydroxide solution can be used for removing fatty compounds and hemicellulose in the wood, part of lignin can be dissolved out, and sodium hydroxide treatment can be used for removing substances which obstruct liquid permeation in the wood conditioner, so that a duct of the conditioner becomes transparent, the liquid permeability of the conditioner is improved, and the water absorption of the wood conditioner is improved. In addition, when the wood conditioner is soaked in a sodium hydroxide solution, the temperature is higher than 90 ℃, and the pressure can be increased in a sealed container, so that a pore membrane on the wall of a conduit of the wood is cracked, the permeability of a fluid is improved, and some extracts in the wood can be dissolved, wherein the chemical composition of the wood comprises phenols, lipids and waxes, the extracts are distributed at various parts of the wood to block or obstruct a liquid permeation path, the permeability degree of the wood conditioner is further improved, and the water absorption of the wood conditioner is also improved. When the board is dried and carbonized, the temperature condition is strictly controlled, the adverse effect of the temperature on the board is reduced, the phenomenon that the cracking possibly occurs due to different stresses in the chord direction, the radial direction and the longitudinal direction of the wood in each stage can be well improved by performing ultrasonic treatment under different conditions, the carbonization treatment on the surface of the board can be more uniform, the surface components of the carbonized wood conditioner are changed, the charcoal structure is not easy to consume oxygen and decompose, in addition, the porosity of the wood conditioner is further increased by the charcoal structure, and the water absorption is increased.
Drawings
FIG. 1 is a scanning electron microscope microscopic view of an untreated wood conditioner slice;
FIG. 2 is a microscopic structure diagram of a scanning electron microscope of a slice of a wood conditioner treated by the method of the present invention;
FIG. 3 is a comparison of infrared spectra of wood conditioning agents.
Detailed Description
The following detailed description is preferred by way of specific embodiments:
example 1: a method for carbonizing the surface of a wood conditioner in sludge compost comprises the following steps:
(1) pretreatment: preparing a sodium hydroxide solution with the mass fraction of 12%, filling the sodium hydroxide solution into a heatable sealed container, heating the sodium hydroxide solution to 90 ℃, and completely soaking the wood conditioner in the sodium hydroxide solution for 110 min;
(2) primary drying treatment: putting the wood conditioner treated in the step (1) into a drying kiln, and drying the wood conditioner to 20% of water content at the temperature of 70 ℃ for later use;
(3) secondary drying treatment: continuously drying the wood conditioner treated in the step (2), keeping the temperature in a drying kiln at 130 ℃, and simultaneously applying ultrasonic waves with the frequency of 60KHz to the wood conditioner for treatment until the water content of the wood conditioner is dried to 4%;
(4) carbonizing treatment: putting the wood conditioner dried in the step (3) into a high-temperature pressure forming machine (adopting an XLB-DH series lower cylinder type high-temperature hot-pressing forming machine) for hot-pressing treatment, wherein the hot-pressing temperature is 210 ℃;
(5) quenching and tempering: and (4) after the carbonization treatment in the step (4), placing the wood conditioner in a room temperature environment, and cooling the wood conditioner in a steam spraying mode.
Example 2: a method for carbonizing the surface of a wood conditioner in sludge compost comprises the following steps:
(1) pretreatment: preparing 15% sodium hydroxide solution, putting the sodium hydroxide solution into a heatable sealed container, heating the sodium hydroxide solution to 95 ℃, and completely soaking the wood conditioner in the sodium hydroxide solution for 120 min;
(2) primary drying treatment: putting the wood conditioner treated in the step (1) into a drying kiln, and drying the wood conditioner to 24% of water content at the temperature of 75 ℃ for later use;
(3) secondary drying treatment: continuously drying the wood conditioner treated in the step (2), keeping the temperature in a drying kiln at 150 ℃, and simultaneously applying ultrasonic waves with the frequency of 65KHz to the wood conditioner for treatment until the water content of the wood conditioner is dried to 5%;
(4) carbonizing treatment: putting the wood conditioner dried in the step (3) into a high-temperature pressure forming machine (adopting an XLB-DH series lower cylinder type high-temperature hot-pressing forming machine) for hot-pressing treatment, wherein the hot-pressing temperature is 220 ℃;
(5) quenching and tempering: and (4) after the carbonization treatment in the step (4), placing the wood conditioner in a room temperature environment, and cooling the wood conditioner in a steam spraying mode.
Example 3: a method for carbonizing the surface of a wood conditioner in sludge compost comprises the following steps:
(1) pretreatment: preparing a sodium hydroxide solution with the mass fraction of 13%, filling the sodium hydroxide solution into a heatable sealed container, heating the sodium hydroxide solution to 93 ℃, and completely soaking the wood conditioner in the sodium hydroxide solution for 115 min;
(2) primary drying treatment: putting the wood conditioner treated in the step (1) into a drying kiln, and drying the wood conditioner to 22% of water content at 73 ℃ for later use;
(3) secondary drying treatment: continuously drying the wood conditioner treated in the step (2), keeping the temperature in a drying kiln at 140 ℃, and simultaneously applying ultrasonic waves with the frequency of 63KHz to the wood conditioner for treatment until the water content of the wood conditioner is dried to 4%;
(4) carbonizing treatment: putting the wood conditioner dried in the step (3) into a high-temperature pressure forming machine (adopting an XLB-DH series lower cylinder type high-temperature hot-pressing forming machine) for hot-pressing treatment, wherein the hot-pressing temperature is 215 ℃;
(5) quenching and tempering: and (4) after the carbonization treatment in the step (4), placing the wood conditioner in a room temperature environment, and cooling the wood conditioner in a steam spraying mode.
Example 4: the wood conditioner is a hardwood board made of white pine, the board is untreated or treated according to the method of example 1, a contrast test is carried out, firstly, the board is sliced and then subjected to a scanning electron microscope, the scanning electron microscope microstructure of the untreated board is shown in figure 1, the scanning electron microscope microstructure of the treated board is shown in figure 2, and then infrared spectroscopy analysis is carried out, and the result is shown in figure 3. As can be seen from FIG. 1, the original conduit of the unmodified wood board is messy, and a lot of substances block the conduit passage in the middle, and as can be seen from FIG. 2, the treated wood board has clear and unobstructed conduits distributed on the surface, which proves that the sodium hydroxide treatment can remove some substances which obstruct the liquid permeation in the wood board, so that the conduit of the conditioner becomes transparent, and the liquid permeability of the conditioner is improved. By infrared spectroscopy, it can be seen from FIG. 3 that the untreated wood board conditioner had the characteristic peak of ester (1735), whereas the treated wood board did not. This demonstrates that the process removes esters from the conditioner. The grease is the main component of the esters, the method removes the grease in the wood board, the hydrophilicity of the wood board is improved, and the conduit in the wood board is smooth due to the removal of the grease, the liquid permeability is improved, and the water absorption is improved.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. A method for carbonizing the surface of a wood conditioner of sludge compost is characterized by comprising the following steps: the method comprises the following steps:
(1) pretreatment: preparing a sodium hydroxide solution with the mass fraction of 12-15%, and then completely soaking the wood conditioner in the sodium hydroxide solution;
(2) primary drying treatment: putting the wood conditioner treated in the step (1) into a drying kiln, and drying the wood conditioner to 20-24% of water content at the temperature of 70-75 ℃ for later use;
(3) secondary drying treatment: continuing drying the wood conditioner treated in the step (2), and keeping the temperature in the drying kiln at 130-150 ℃;
(4) carbonizing treatment: putting the wood conditioner dried in the step (3) into a high-temperature pressure forming machine for hot pressing, wherein the hot pressing temperature is 210-220 ℃;
(5) quenching and tempering: and (4) after the carbonization treatment in the step (4), placing the wood conditioner in a room temperature environment, and cooling the wood conditioner in a steam spraying mode.
2. The method for carbonizing the surface of the sludge composting wood conditioner as claimed in claim 1, wherein: the wood conditioner is a hardwood board made of white pine.
3. The method for carbonizing the surface of the sludge composting wood conditioner as claimed in claim 2, wherein: the soaking time of the wood conditioner in the step (1) is 110-120 min.
4. The method for carbonizing the surface of a sludge composting wood conditioner as claimed in claim 3, wherein: the temperature of the sodium hydroxide solution in the step (1) is 90-95 ℃.
5. The method of claim 4, wherein the method comprises the following steps: and (2) soaking the wood conditioner in a sealed container in the step (1).
6. The method for carbonizing the surface of a sludge composting wood conditioner as claimed in claim 5, wherein: and (3) applying ultrasonic waves with the frequency of 60-65KHz to the wood conditioner for treatment while drying the wood conditioner in the step (3) until the water content of the wood conditioner is dried to 4-5%.
7. The method for carbonizing the surface of a sludge composting wood conditioner as claimed in claim 6, wherein: the high-temperature pressure forming machine in the step (4) adopts an XLB-DH series lower cylinder type high-temperature hot-pressing forming machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011249602.2A CN112358335A (en) | 2020-11-10 | 2020-11-10 | Method for carbonizing surface of sludge compost wood conditioner |
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| CN202011249602.2A CN112358335A (en) | 2020-11-10 | 2020-11-10 | Method for carbonizing surface of sludge compost wood conditioner |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450499A (en) * | 2007-11-29 | 2009-06-10 | 曲志强 | Wood carbonization method |
| CN103757060A (en) * | 2012-08-08 | 2014-04-30 | 达科他星都有限公司 | Process for treating lignocellulosic biomass |
| CN106182307A (en) * | 2016-07-22 | 2016-12-07 | 阜南县永盛工艺品有限公司 | A kind of carbonization method of veneer lumber |
| CN106272834A (en) * | 2016-09-22 | 2017-01-04 | 安徽三和工艺品有限公司 | A kind of board surface carbonization treatment technique |
| CN106313249A (en) * | 2016-09-22 | 2017-01-11 | 安徽三和工艺品有限公司 | Deep carbonation method for thick and heavy wood plate |
| CN108943245A (en) * | 2018-08-28 | 2018-12-07 | 山东农业大学 | The preparation method of multi-functional carbonized wood |
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2020
- 2020-11-10 CN CN202011249602.2A patent/CN112358335A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450499A (en) * | 2007-11-29 | 2009-06-10 | 曲志强 | Wood carbonization method |
| CN103757060A (en) * | 2012-08-08 | 2014-04-30 | 达科他星都有限公司 | Process for treating lignocellulosic biomass |
| CN106182307A (en) * | 2016-07-22 | 2016-12-07 | 阜南县永盛工艺品有限公司 | A kind of carbonization method of veneer lumber |
| CN106272834A (en) * | 2016-09-22 | 2017-01-04 | 安徽三和工艺品有限公司 | A kind of board surface carbonization treatment technique |
| CN106313249A (en) * | 2016-09-22 | 2017-01-11 | 安徽三和工艺品有限公司 | Deep carbonation method for thick and heavy wood plate |
| CN108943245A (en) * | 2018-08-28 | 2018-12-07 | 山东农业大学 | The preparation method of multi-functional carbonized wood |
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| 何盛 等: "碱液处理对改善竹束液体渗透性能的研究", 《林业工程学报》 * |
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Application publication date: 20210212 |