CN112239313A - Method for preparing landscaping special material by using sludge - Google Patents
Method for preparing landscaping special material by using sludge Download PDFInfo
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- CN112239313A CN112239313A CN202011012380.2A CN202011012380A CN112239313A CN 112239313 A CN112239313 A CN 112239313A CN 202011012380 A CN202011012380 A CN 202011012380A CN 112239313 A CN112239313 A CN 112239313A
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- sludge
- drying
- landscaping
- preparing
- special material
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- 239000010802 sludge Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000010828 animal waste Substances 0.000 claims abstract description 7
- 230000000813 microbial effect Effects 0.000 claims abstract description 7
- 239000011265 semifinished product Substances 0.000 claims abstract description 7
- 241001148470 aerobic bacillus Species 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 239000010902 straw Substances 0.000 claims abstract description 6
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims abstract description 6
- 230000001877 deodorizing effect Effects 0.000 claims abstract description 4
- 238000000855 fermentation Methods 0.000 claims abstract description 4
- 230000004151 fermentation Effects 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 241000196324 Embryophyta Species 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 229910001385 heavy metal Inorganic materials 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 241001122767 Theaceae Species 0.000 claims description 3
- 239000012445 acidic reagent Substances 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 239000010865 sewage Substances 0.000 description 7
- 241000282414 Homo sapiens Species 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 2
- 241000589651 Zoogloea Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000003608 fece Anatomy 0.000 description 2
- FXHGMKSSBGDXIY-UHFFFAOYSA-N heptanal Chemical compound CCCCCCC=O FXHGMKSSBGDXIY-UHFFFAOYSA-N 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 2
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
- WMOOOIUXYRHDEZ-UHFFFAOYSA-N 2,3,4-trichlorobenzaldehyde Chemical compound ClC1=CC=C(C=O)C(Cl)=C1Cl WMOOOIUXYRHDEZ-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for preparing a special material for landscaping by using sludge, which comprises the following steps: step 1, deodorizing sludge, namely putting anaerobic bacteria and aerobic bacteria into a sludge pit, and recovering gas released from the sludge pit through an absorption device; step 2, absorbing the gas and then introducing the gas into an absorption tower for absorption; step 3, carrying out pH value detection and water content detection on the sludge obtained in the step 1; step 4, adding animal wastes, plant rotting matters and straw ash obtained from gardens into the sludge obtained in the step 3, drying the kitchen garbage and the microbial agent to form a sludge mixture; step 5, putting the sludge mixture into a stirrer for fully stirring; step 6, sampling the sludge after full fermentation to obtain a detection sample; step 7, drying or sun-drying the obtained semi-finished product to form a solid; step 8, crushing the solid sludge mixture into powder by a crusher; and 9, bagging and storing.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for preparing a special material for landscaping by using sludge.
Background
Domestic sludge is the final product in the process of treating urban domestic sewage, and the current sewage treatment technology mainly transfers a large amount of pollutants in the sewage into the sludge by a physical and chemical method and a microbial treatment method so as to achieve the aim of purifying the sewage. The essence of sewage treatment is the transfer of part of pollutants, and a large amount of soluble pollutants are changed into insoluble solids, namely sludge, while the sewage is purified. The sludge has complex components, mainly consists of zoogloea formed by a plurality of microorganisms and an aggregate formed by organic matters and inorganic matters absorbed by the zoogloea, the sludge generally contains a large amount of water, and solid matters in the sludge mainly comprise organic matters, heavy metal salts, a small amount of pathogenic microorganisms and the like which are difficult to degrade.
During the putrefaction process of various organic matters in the sludge, the organic matters and various bacteria in the sludge can act together, and a large amount of complex and malodorous harmful gases such as ammonia gas, trimethylamine, ethylamine, tetramethylenediamine, heptanal, butyric acid, nitrobenzene, osmyl or trichlorobenzaldehyde are easy to generate.
At present, the sludge treatment method mainly comprises land utilization, landfill, incineration, biochemical treatment, dumping, throwing into the sea and the like. However, the sludge produced in the sewage treatment process has high water content and large volume, which brings great inconvenience to the transportation, final disposal and utilization of the sludge, so that the water is separated from the sludge by means of sludge dehydration and drying. The heat value of the sludge is very low, and if the sludge is treated by adopting an incineration method, the energy cost is also very high. Therefore, the economic method is to apply the thermal drying technology and equipment commonly used in chemical operation to achieve deep dehydration of the sludge. But the characteristics of the sludge determine that the dehydration difficulty is high and the energy consumption is high in the sludge drying process.
Since sludge agriculture is related to human food chain, sludge land utilization is generally referred to as sludge agriculture and heavy metal pollution, so that sludge land utilization in other modes is limited to a certain extent, sludge agriculture and other forms of land utilization are treated differently, sludge land utilization (excluding agriculture) countries are encouraged to use more land, and sludge land utilization in modes of forestry, greening, soil improvement and the like is actively promoted. On one hand, the nutrient components and trace elements in the sludge can promote the growth of trees; on the other hand, the sludge forest land greening application can not enter a food chain, so that the harm to human health can not be caused. Especially, the sludge is applied to non-densely populated areas such as forests, forest farms and the like, so that the sludge is safe, the areas of the forest lands, barren mountains and the like are large, the relative environmental capacity is also large, a large amount of sludge can be absorbed, and the forest trees can accelerate the growth of nitrogen, phosphorus and the like in the sludge. The land utilization of the modes is less in direct risk to human beings compared with the sludge agriculture, and a large amount of urban domestic sludge can be consumed.
The sludge land utilization investment is low, the energy consumption is low, the operating cost is low, and organic matters can be converted into effective components of soil conditioners, so that the method conforms to the sustainable development strategy, and is considered as a sludge disposal mode with development potential.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing a special material for landscaping by using sludge is characterized by comprising the following steps:
step 1, deodorizing sludge, namely placing the sludge in a closed sludge pit, placing anaerobic bacteria and aerobic bacteria in the sludge pit, and recovering gas released from the sludge pit through an absorption device;
step 2, absorbing the gas and then introducing the gas into an absorption tower for absorption;
step 3, carrying out pH value detection and water content detection on the sludge obtained in the step 1, adjusting the pH value to be neutral according to a detection result, and adjusting the pH value to be sludge with the water content of 55-60% by a solidification means;
step 4, adding animal wastes, plant rotting matters and straw ash obtained from gardens into the sludge obtained in the step 3, drying the kitchen garbage and the microbial agent to form a sludge mixture;
step 5, putting the sludge mixture into a stirrer, fully stirring, and fermenting for 7-9 days;
step 6, sampling the sludge after full fermentation to obtain a detection sample, measuring the contents of nitrogen, phosphorus, potassium and organic matters in the detection sample, and adding appropriate additives containing nitrogen, phosphorus and potassium and organic matters according to the detection sample to form a semi-finished product meeting the greening material condition;
step 7, drying or sun-drying the obtained semi-finished product to form a solid;
step 8, crushing the solid sludge mixture into powder by a crusher;
and 9, bagging and storing until the tea is put into use.
The invention is further provided that the animal manure in the step 4 is dried before being mixed, and the water content is 10-15%.
In the invention, the plant decomposition product in the step 4 is at least one of plant branches, petals and leaves.
The invention is further configured that if the PH value detection result in the step 3 is acidic, an alkaline reagent is added; and if the pH value detection result is alkaline, adding an acidic reagent.
According to the invention, the sludge incineration ash can be added in the step 4.
The invention further provides that the sludge is subjected to heavy metal adsorption before the sludge mixture is formed in the step 4.
The invention has the beneficial effects that firstly, the odor emission of the sludge in the device is accelerated by aerobic bacteria and anaerobic bacteria, and the odor is absorbed by the corresponding absorption tower, so that the device is safe and environment-friendly; then adding animal wastes, plant rotting matters and straw ash which can be obtained in gardens into the sludge, drying the kitchen garbage, and then matching with a microbial agent to form a sludge mixture, and removing heavy metals from the sludge to meet the condition of greening materials.
Detailed Description
The following embodiments will be described in detail with reference to the accompanying examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present application can be fully understood and implemented.
The invention adopts the following technical scheme that a method for preparing a special material for landscaping by using sludge is characterized by comprising the following steps of:
step 1, deodorizing sludge, namely placing the sludge in a closed sludge pit, placing anaerobic bacteria and aerobic bacteria in the sludge pit, and recovering gas released from the sludge pit through an absorption device;
step 2, absorbing the gas and then introducing the gas into an absorption tower for absorption;
step 3, carrying out pH value detection and water content detection on the sludge obtained in the step 1, adjusting the pH value to be neutral according to a detection result, and adjusting the pH value to be sludge with the water content of 55-60% by a solidification means;
step 4, adding animal wastes, plant rotting matters and straw ash obtained from gardens into the sludge obtained in the step 3, drying the kitchen garbage and the microbial agent to form a sludge mixture;
step 5, putting the sludge mixture into a stirrer, fully stirring, and fermenting for 7-9 days;
step 6, sampling the sludge after full fermentation to obtain a detection sample, measuring the contents of nitrogen, phosphorus, potassium and organic matters in the detection sample, and adding appropriate additives containing nitrogen, phosphorus and potassium and organic matters according to the detection sample to form a semi-finished product meeting the greening material condition;
step 7, drying or sun-drying the obtained semi-finished product to form a solid;
step 8, crushing the solid sludge mixture into powder by a crusher;
and 9, bagging and storing until the tea is put into use.
Wherein the animal manure in the step 4 is dried before being mixed, and the water content is 10-15%.
Wherein the plant humification in the step 4 is from at least one of plant branches, petals and leaves.
Wherein, if the PH value detection result in the step 3 is acidic, an alkaline reagent is added; and if the pH value detection result is alkaline, adding an acidic reagent.
Wherein sludge incineration ash can also be added in the step 4.
Wherein the sludge is subjected to heavy metal adsorption before the sludge mixture is formed in the step 4.
The invention firstly accelerates the odor emission of the sludge in the interior through aerobic bacteria and anaerobic bacteria, and absorbs the odor through the corresponding absorption tower, thereby being safe and environment-friendly; then adding animal wastes, plant rotting matters and straw ash which can be obtained in gardens into the sludge, drying the kitchen garbage, and then matching with a microbial agent to form a sludge mixture, and removing heavy metals from the sludge to meet the condition of greening materials.
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
It is noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method for preparing a special material for landscaping by using sludge is characterized by comprising the following steps:
step 1, deodorizing sludge, namely placing the sludge in a closed sludge pit, placing anaerobic bacteria and aerobic bacteria in the sludge pit, and recovering gas released from the sludge pit through an absorption device;
step 2, absorbing the gas and then introducing the gas into an absorption tower for absorption;
step 3, carrying out pH value detection and water content detection on the sludge obtained in the step 1, adjusting the pH value to be neutral according to a detection result, and adjusting the pH value to be sludge with the water content of 55-60% by a solidification means;
step 4, adding animal wastes, plant rotting matters and straw ash obtained from gardens into the sludge obtained in the step 3, drying the kitchen garbage and the microbial agent to form a sludge mixture;
step 5, putting the sludge mixture into a stirrer, fully stirring, and fermenting for 7-9 days;
step 6, sampling the sludge after full fermentation to obtain a detection sample, measuring the contents of nitrogen, phosphorus, potassium and organic matters in the detection sample, and adding appropriate additives containing nitrogen, phosphorus and potassium and organic matters according to the detection sample to form a semi-finished product meeting the greening material condition;
step 7, drying or sun-drying the obtained semi-finished product to form a solid;
step 8, crushing the solid sludge mixture into powder by a crusher;
and 9, bagging and storing until the tea is put into use.
2. The method for preparing a special material for landscaping according to claim 1, wherein the animal waste in step 4 is dried before mixing, and the water content is 10-15%.
3. The method as claimed in claim 2, wherein the plant decomposition products in step 4 are derived from at least one of branches, petals and leaves of plants.
4. The method for preparing a special material for landscaping using sludge as claimed in claim 3, wherein in step 3, if the pH value detection result is acidic, an alkaline reagent is added; and if the pH value detection result is alkaline, adding an acidic reagent.
5. The method for preparing special material for landscaping according to claim 4, wherein sludge incineration ash can be added in the step 4.
6. The method for preparing special material for landscaping using sludge as claimed in claim 5, wherein the sludge is subjected to heavy metal adsorption before the sludge mixture is formed in step 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012380.2A CN112239313A (en) | 2020-09-24 | 2020-09-24 | Method for preparing landscaping special material by using sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012380.2A CN112239313A (en) | 2020-09-24 | 2020-09-24 | Method for preparing landscaping special material by using sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112239313A true CN112239313A (en) | 2021-01-19 |
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ID=74171301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011012380.2A Pending CN112239313A (en) | 2020-09-24 | 2020-09-24 | Method for preparing landscaping special material by using sludge |
Country Status (1)
| Country | Link |
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| CN (1) | CN112239313A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830739A (en) * | 2010-04-15 | 2010-09-15 | 天津市北方园林生态科学技术研究所 | Technique for developing landscape special nutrient soil by using municipal sludge |
| CN107027541A (en) * | 2017-03-31 | 2017-08-11 | 北京农学院 | A kind of method of the utilization municipal solid wastes production afforestation raw-soil again |
| CN109328977A (en) * | 2018-11-09 | 2019-02-15 | 宁波高新区纯丽节能技术有限公司 | A method of utilizing municipal sludge preparation afforestation soil |
-
2020
- 2020-09-24 CN CN202011012380.2A patent/CN112239313A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830739A (en) * | 2010-04-15 | 2010-09-15 | 天津市北方园林生态科学技术研究所 | Technique for developing landscape special nutrient soil by using municipal sludge |
| CN107027541A (en) * | 2017-03-31 | 2017-08-11 | 北京农学院 | A kind of method of the utilization municipal solid wastes production afforestation raw-soil again |
| CN109328977A (en) * | 2018-11-09 | 2019-02-15 | 宁波高新区纯丽节能技术有限公司 | A method of utilizing municipal sludge preparation afforestation soil |
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Application publication date: 20210119 |
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