CN114315096A - Sludge soil additive and preparation method and application thereof - Google Patents
Sludge soil additive and preparation method and application thereof Download PDFInfo
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- CN114315096A CN114315096A CN202111390115.2A CN202111390115A CN114315096A CN 114315096 A CN114315096 A CN 114315096A CN 202111390115 A CN202111390115 A CN 202111390115A CN 114315096 A CN114315096 A CN 114315096A
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
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Abstract
The invention discloses a sludge soil additive and a preparation method and application thereof, wherein the sludge soil additive consists of mixed soil a, mixed soil b and mixed soil C which are separated from each other, and the preparation method comprises the following steps: taking soil beside a dredging river channel as a main raw material, and dividing the soil into coarse-grained soil, medium-grained soil and fine-grained soil; mixing a certain amount of modifier and biomass in fine soil uniformly, and standing for 4-10 h to obtain mixed soil a; adding a certain amount of loosening agent into the medium-grained soil, and uniformly mixing to obtain mixed soil b; adding a certain amount of conditioner into the coarse-grained soil, and uniformly mixing to obtain mixed soil c; the mixed soil a is used as a medicament in a sludge flocculation stage and is directly added into sludge, so that sludge-water separation is promoted; adding the mixed soil b in batches in the sludge extrusion dehydration stage for improving the extrusion dehydration efficiency and the porosity; and adding the mixed soil c after the mud cake obtained after the mud is extruded and dewatered is crushed for improving the soil and recycling the mud.
Description
Technical Field
The invention belongs to the technical field of river regulation, relates to a silt soil additive, a preparation method and application thereof, and particularly relates to a silt soil additive prepared from modified soil.
Background
The sludge is an important component of the water body, most pollutants in the polluted water body are enriched in the sludge, and the most effective method for repairing the polluted river channel at present is to remove endogenous pollutants, namely to dredge the bottom sludge. A large amount of sludge is generated after dredging, so that the rapid digestion and resource utilization of the sludge become a research hotspot for river regulation.
The premise of recycling the sludge is to reduce the water content of the sludge, and a chemical flocculant needs to be added before the sludge is mechanically dewatered at present, so that the residue of the flocculant can be caused, and secondary environmental pollution is brought. The soil mainly comprises SiO2, Al2O3, Fe2O3 and the like, wherein Si can be used as an effective coagulation-aiding component, Al and Fe are main flocculation components, and in addition, minerals in the soil can also play a flocculation role. The porosity of sand grains in the soil is high, and the effect of a sludge dewatering stage can be enhanced. The existing method for modifying natural minerals such as soil and the like as a flocculating agent generally utilizes acids such as sulfuric acid, hydrochloric acid and the like for modification, and the acid modification has the defects of low pH value and inconvenience for subsequent sludge resource utilization.
Disclosure of Invention
The purpose is as follows: aiming at the situation and overcoming the defects of the prior art, the invention provides the sludge soil additive and the preparation method and the application thereof.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, there is provided a method for preparing a sludge-based additive for soil formation, the sludge-based additive for soil formation being composed of a mixed soil a, a mixed soil b and a mixed soil C which are separated from each other, the method comprising:
(1) taking soil beside a dredging river channel as a main raw material, and pretreating the soil into coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size of less than 0.02 mm;
(2) mixing a certain amount of modifier and biomass in fine soil uniformly, and standing for 4-10 h to obtain mixed soil a; wherein the addition amount of the modifying agent is 0.1-5wt% of the fine grained soil, and the addition amount of the biomass is 1-10wt% of the fine grained soil;
(3) adding a certain amount of loosening agent into the medium-grained soil, and uniformly mixing to obtain mixed soil b; wherein the addition amount of the loosening agent is 1-5wt% of the medium-grained soil;
(4) adding a certain amount of conditioner into the coarse-grained soil, and uniformly mixing to obtain mixed soil c; wherein the addition amount of the conditioner is 0.5-5wt% of the coarse-grained soil;
the mixed soil a is used as a medicament in a sludge flocculation stage and is directly added into sludge, so that sludge-water separation is promoted; adding the mixed soil b in batches in the sludge extrusion dehydration stage for improving the extrusion dehydration efficiency and the porosity; and adding the mixed soil c after the mud cake obtained after the mud is extruded and dewatered is crushed for improving the soil and recycling the mud.
Wherein the soil can be dug at the side of the dredging river channel, and the additive can be prepared on site.
In some embodiments, the pretreating the soil comprises:
the dug soil is aired and air-dried, plastic garbage, animal and plant residues and stones with the particle size larger than 5mm are removed, and then the soil is divided into coarse-grained soil, medium-grained soil and fine-grained soil through a vibrating screen machine.
In some embodiments, the modifying agent is a natural polymeric flocculant selected from one or more of chitosan and lignin.
In some embodiments, the biomass is a crop powder, including straw powders of various types.
In some embodiments, the loosening agent is selected from one or more of plant ash, fly ash and activated carbon powder.
In some embodiments, the conditioner is a natural mineral substance selected from one or more of vermiculite and perlite.
In a second aspect, a sludge soil additive is provided, which is prepared by the method.
In a third aspect, there is provided a method of using the sludge-based soil improvement additive, comprising:
directly adding mixed soil a as a sludge flocculation stage medicament into sludge to be subjected to soil formation to promote sludge-water separation;
adding the mixed soil b in batches in the sludge extrusion dehydration stage for improving the extrusion dehydration efficiency and the porosity;
and adding the mixed soil c after the mud cake obtained after the mud is extruded and dewatered is crushed for improving the soil and recycling the mud.
Has the advantages that: the invention provides a sludge soil additive and a preparation method and application thereof, and the sludge soil additive prepared by modified soil is prepared by the following steps: (1) soil beside a dredging river channel is taken as a main raw material, and the soil is divided into coarse-grained soil, medium-grained soil and fine-grained soil. (2) Adding biomass such as natural polymeric flocculant, straw powder and the like into the fine soil part to improve the flocculation property and keep the fertility. The biomass can be hydrolyzed and acidified to generate organic acid in the early stage, and the organic acid can dissolve out partial aluminum ions and iron ions in the soil, so that the flocculation performance is improved. This fraction acts as an additive in the sludge flocculation stage. (3) The loosening agent such as fly ash is added to the medium-grained soil part, so that the porous structure of the soil is improved, the porosity of the soil is further improved, and the soil can be used as an additive in a sludge dewatering stage to strengthen the extrusion dewatering effect. (4) The natural minerals with strong air permeability and water and fertilizer retention are added into the coarse-grained soil part to be used as the additive of the dewatered sludge, so that the soil conversion and resource utilization of the sludge can be further improved.
After the additive is added, the water content of the discharged sludge can reach 30% -50%, the porosity of the dewatered sludge is increased, and the sludge is favorable for further soil conversion and resource utilization, such as soil for agriculture and forestry, slope protection greening and the like. Meanwhile, the sludge soil additive prepared from the modified soil is a natural additive without biotoxicity, is simple and convenient to prepare, is low in cost, fully utilizes the soil, can be directly prepared on a dredging site, and has practical significance.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below with reference to the embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise specified,% in the present application are mass percentages.
Example 1
And dredging the river channel, wherein the initial water content of the sludge is 95%. Digging soil beside a river channel, airing and air-drying the dug soil, removing plastic garbage, animal and plant residues and stones with the particle size larger than 5mm, and then dividing the soil into coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size smaller than 0.02mm by a vibrating screen machine. For fine-grained soil, 1% of chitosan powder is added, 5% of straw powder is added, stirring is carried out, standing is carried out for 6 hours, and mixed soil a is obtained, wherein the mixed soil is prepared from the following components in percentage by weight: mixed soil a = 1: the mixed soil a is directly used as a sludge flocculating agent to be added into the dredged sludge according to the mass ratio of 0.005, the sludge can be settled within 30min, and the water content of the discharged sludge reaches about 60 percent. For medium particle soil, 2% of fly ash is added, and the mixture can be used as an additive in a sludge dehydration stage after being fully stirred according to the weight ratio of 0.1: 1 (mixed soil b: sludge), namely adding the mixed soil b to the sludge in batches in the step of filter pressing and dewatering the sludge, wherein the water content of a sludge cake after the sludge is dewatered can reach about 40 percent finally. Mixing 0.5% of vermiculite and perlite into coarse-grained soil to obtain mixed soil c, crushing dewatered mud cakes according to the weight ratio of the mud: mixed soil c = 1: the mixed soil c is added according to the mass ratio of 0.35, so that the porosity of the discharged mud is further improved, and the soil formation of the mud is promoted.
Example 2
And dredging the river channel, wherein the initial water content of the sludge is 90%. Taking soil, airing and air-drying the dug soil, removing plastic wastes, animal and plant residues and stones with the particle size larger than 5mm, and then dividing the soil into three parts, namely coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size smaller than 0.02mm by using a vibrating screen machine. For fine soil, adding 0.5% of lignin powder mixture of chitosan powder, adding 2% of straw powder, stirring, standing for 5h to obtain mixed soil a, mixing the fine soil with the lignin powder mixture, and stirring the mixture according to the weight ratio of sludge: mixed soil a = 1: 0.0075, directly adding the mixed soil a serving as a sludge flocculant into the dredged sludge in a mass ratio of 0.007the sludge can be settled within 40min, and the water content of the discharged sludge reaches about 60%. For medium particle soil, 1% of fly ash is added, and the mixture can be used as an additive in a sludge dehydration stage after being fully stirred according to the weight ratio of 0.2: 1 (mixed soil b: sludge), namely adding the mixed soil b to the sludge in batches in the step of filter pressing and dewatering the sludge, wherein the water content of a sludge cake after the sludge is dewatered can reach about 45 percent finally. Mixing 1% of vermiculite and perlite mixture into coarse-grained soil to obtain mixed soil c, crushing dewatered mud cakes according to the weight ratio of the mud: mixed soil c = 1: 0.3 mass ratio is added to the mixed soil c to improve the porosity of the produced mud and improve the soil formation degree.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A preparation method of a sludge soil additive is characterized in that the sludge soil additive is composed of mixed soil a, mixed soil b and mixed soil C which are separated from each other, and the preparation method comprises the following steps:
(1) taking soil beside a dredging river channel as a main raw material, and pretreating the soil into coarse-grained soil with the particle size of 2-5 mm, medium-grained soil with the particle size of 0.02-2 mm and fine-grained soil with the particle size of less than 0.02 mm;
(2) mixing a certain amount of modifier and biomass in fine soil uniformly, and standing for 4-10 h to obtain mixed soil a; wherein the addition amount of the modifying agent is 0.1-5wt% of the fine grained soil, and the addition amount of the biomass is 1-10wt% of the fine grained soil;
(3) adding a certain amount of loosening agent into the medium-grained soil, and uniformly mixing to obtain mixed soil b; wherein the addition amount of the loosening agent is 1-5wt% of the medium-grained soil;
(4) adding a certain amount of conditioner into the coarse-grained soil, and uniformly mixing to obtain mixed soil c; wherein the addition amount of the conditioner is 0.5-5wt% of the coarse-grained soil.
2. The method for preparing a sludge soil additive according to claim 1, wherein the soil is pretreated by:
the dug soil is aired and air-dried, plastic garbage, animal and plant residues and stones with the particle size larger than 5mm are removed, and then the soil is divided into coarse-grained soil, medium-grained soil and fine-grained soil through a vibrating screen machine.
3. The method for preparing the sludge soil chemical additive according to the claim 1, wherein the modifying agent is a natural polymeric flocculant selected from one or more of chitosan and lignin.
4. The method for preparing a sludge-concellation additive according to claim 1, characterised in that the biomass is a crop powder.
5. The method for preparing the sludge soil additive according to claim 1, wherein the loosening agent is one or more selected from plant ash, fly ash and activated carbon powder.
6. The method for preparing the sludge soil additive according to claim 1, wherein the conditioner is natural mineral, and is selected from one or a mixture of vermiculite and perlite.
7. A sludge-soil additive prepared by the method of any one of claims 1 to 6.
8. The method of using a sludge amendment additive according to claim 7, comprising:
directly adding mixed soil a as a sludge flocculation stage medicament into sludge to be subjected to soil formation to promote sludge-water separation;
adding the mixed soil b in batches in the sludge extrusion dehydration stage for improving the extrusion dehydration efficiency and the porosity;
and adding the mixed soil c after the mud cake obtained after the mud is extruded and dewatered is crushed for improving the soil and recycling the mud.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116217037A (en) * | 2023-01-09 | 2023-06-06 | 北京科技大学 | Treatment method, reactant and application of silt soil discharged by shield tunnel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1817803A (en) * | 2005-02-07 | 2006-08-16 | 中国科学院沈阳应用生态研究所 | Safety and ecological natural built-up flocculant, its production and use |
| CN101805104A (en) * | 2010-04-27 | 2010-08-18 | 河海大学 | Soil treatment method for dredged sediment |
| CN101863601A (en) * | 2009-04-14 | 2010-10-20 | 株式会社安农津技研 | Flocculation curing agent, composition thereof and stabilization improvement method of silt type soil |
| CN105776464A (en) * | 2015-12-15 | 2016-07-20 | 富凯迪沃（天津）环保科技有限公司 | Preparation method and application of maifanite mineral material flocculation agent |
| CN107163951A (en) * | 2017-07-12 | 2017-09-15 | 合肥梵腾环保科技有限公司 | A kind of soil pollution modifying agent and preparation method |
| CN109627084A (en) * | 2018-12-26 | 2019-04-16 | 龙蟒大地农业有限公司 | A kind of carbon-based mineral member soil conditioner and preparation method thereof |
| WO2020027191A1 (en) * | 2018-08-01 | 2020-02-06 | 花王株式会社 | Method for improving ground |
-
2021
- 2021-11-23 CN CN202111390115.2A patent/CN114315096B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1817803A (en) * | 2005-02-07 | 2006-08-16 | 中国科学院沈阳应用生态研究所 | Safety and ecological natural built-up flocculant, its production and use |
| CN101863601A (en) * | 2009-04-14 | 2010-10-20 | 株式会社安农津技研 | Flocculation curing agent, composition thereof and stabilization improvement method of silt type soil |
| CN101805104A (en) * | 2010-04-27 | 2010-08-18 | 河海大学 | Soil treatment method for dredged sediment |
| CN105776464A (en) * | 2015-12-15 | 2016-07-20 | 富凯迪沃（天津）环保科技有限公司 | Preparation method and application of maifanite mineral material flocculation agent |
| CN107163951A (en) * | 2017-07-12 | 2017-09-15 | 合肥梵腾环保科技有限公司 | A kind of soil pollution modifying agent and preparation method |
| WO2020027191A1 (en) * | 2018-08-01 | 2020-02-06 | 花王株式会社 | Method for improving ground |
| CN109627084A (en) * | 2018-12-26 | 2019-04-16 | 龙蟒大地农业有限公司 | A kind of carbon-based mineral member soil conditioner and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 骆勇军等: "疏浚淤泥处置利用技术研究综述", 《浙江水利科技》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116217037A (en) * | 2023-01-09 | 2023-06-06 | 北京科技大学 | Treatment method, reactant and application of silt soil discharged by shield tunnel |
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