CN105217925B - A kind of sludge in-situ curing and stabilized curing agent and its preparation method and application - Google Patents

A kind of sludge in-situ curing and stabilized curing agent and its preparation method and application Download PDF

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CN105217925B
CN105217925B CN201510657325.1A CN201510657325A CN105217925B CN 105217925 B CN105217925 B CN 105217925B CN 201510657325 A CN201510657325 A CN 201510657325A CN 105217925 B CN105217925 B CN 105217925B
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sludge
curing agent
situ
salt
curing
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CN201510657325.1A
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CN105217925A (en
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甄胜利
刘博�
陈三林
金晶
王思羽
罗彬�
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北京高能时代环境技术股份有限公司
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Abstract

The present invention discloses a kind of sludge in-situ curing and stabilized curing agent and its preparation method and application, which includes the component of following percentage by weight:Cement 40 ~ 60%, quick lime 10 ~ 20%, clay mineral 10 ~ 25%, inorganic salts 5 ~ 20%, admixture 3~8%;Wherein, the clay mineral is the mixture for including bentonite, kaolin and zeolite, and the inorganic salts are aluminium salt, sodium salt, calcium salt, the one of which or its two or more any combination of magnesium salts, and the admixture is a kind of inorganic polymer.The curing agent of the present invention is suitable for sludge in-situ and cures and stabilize construction technology, can simplify treatment process program and difficulty, and pollutant in sludge is innoxious, improves sludge early strength, improves construction efficiency, reduces processing cost, and solidification effect is good.

Description

A kind of sludge in-situ curing and stabilized curing agent and its preparation method and application
Technical field
The present invention relates to sludge treatment field, and in particular to a kind of sludge in-situ cures and stabilized curing agent and its system Preparation Method and application.
Background technology
Sludge sanitary landfills is the mode often taken in current domestic many large-scale wastewater treatment plants, by postdigestive dirt Mud content of organics is reduced, and performance is stablized, and cumulative volume is reduced, and as landfill stabilization is a kind of both economical processing side after dehydration Formula.The current municipal sludge yield in China will break through 35,000,000 tons/year, and wherein 60 ~ 65% sludge use sanitary landfills side Formula is handled.
Sludge treatment main method in China's is disposed for Sludge landfill at present, is simply filled out wherein most of sludge landfills use Mode is buried, does not carry out effective seepage control measure, in itself and without harmless treatment, fill out in the sludge of hole has sludge containing various Malicious nuisance, erosion through rainwater and leakage contaminating action Soil Surrounding and groundwater environment, this for surrounding enviroment form compared with Big security risk.In addition landfill yard fills out in hole that Sludge landfill amount is big, depth is deeper, and sludge is poor in stream plastomer, stability, if Generation is man-machine to be absorbed in or dam-break accident, will be constituted a threat to the security of the lives and property of periphery production activity resident.Therefore some is worked as When municipal sludge landfill yard Sludge landfill amount reaches saturation, there is an urgent need for adopting an effective measure to be disposed landfill yard closing, reduce Its security risk and threat to periphery ecological environment and resident.
Sludge in-situ solidification and stabilization method of disposal has and sludge sump is disturbed as a kind of new sludge disposal method It is dynamic less, secondary pollution it is small, equipment is less, construction site is small, treatment process is simple, engineering is convenient to carry out, during solidification sludge Leachate site is not produced, the advantages that construction efficiency is higher, chooses that the sludge in-situ effectively used cures and stabilized curing agent is The key link of sludge in-situ curing/stabilizing disposing technique, for ensureing that construction safety and construction quality are most important.
The content of the invention
In order to solve the above-mentioned technical problem, in-situ solidifying and stabilization processes are carried out to the municipal sludge of sludge landfill, It must consider that sludge in-situ cures construction technology particularity, while reducing moisture percentage in sewage sludge, keep sludge curing body pH balances, Sludge Leaching is effectively reduced, prevents that harmful components pollute Soil Surrounding and body of groundwater in sludge after curing, together When must also improve solidification sludge early strength, so that sludge can be used as construction platform load-bearing heavy mechanical equipment to make up after curing Industry, ensures construction speed and safety, and the present invention provides a kind of sludge in-situ and cures and stabilized curing agent and its preparation side Method and application.
The present invention provides a kind of sludge in-situ curing and stabilized curing agent, includes the component of following percentage by weight:
Cement 40 ~ 60%,
Quick lime 10 ~ 20%,
Clay mineral 10 ~ 30%,
Inorganic salts 5 ~ 20%,
Admixture 3~5%.
The curing agent is solid dry powder-shaped, and each constituent is solid dry powder above, granular size without Specific particular particle size requirement, the ratio of each constituent are calculated in the form of percent purity, and each component is curing Shared ratio is to select the material of 100% purity to be calculated in agent.
Wherein described clay mineral includes bentonite, kaolin and zeolite, be uniformly mixed, wherein bentonite, kaolin and The percentage by weight of zeolite is:Bentonite 40 ~ 70%, kaolin 20 ~ 40%, zeolite 10 ~ 20%.Preferably, in the clay mineral The mass ratio of bentonite, kaolin and zeolite is 50.8: 33.7: 15.5.The admixture gathers for inorganic polymer Compound.
It is further preferred that wherein described inorganic salts are aluminium salt, calcium salt, sodium salt, the one of which of magnesium salts or its two kinds are appointed Meaning combination.When the inorganic salts select aluminium salt, calcium salt, sodium salt, in magnesium salts two groups be combined when, the ratio of specific two kinds of components Relation is as follows:When selecting aluminium salt and calcium salt, the mass ratio of aluminium salt and calcium salt is 2:1~1:3, when selecting aluminium salt and sodium salt, aluminium The mass ratio of salt and sodium salt is 1:1~1:4, when selecting aluminium salt and magnesium salts, the mass ratio of aluminium salt and magnesium salts is 1:3~1:4 is elected When selecting calcium salt and sodium salt, the mass ratio of calcium salt and sodium salt is 1:1~1:3, when selecting calcium salt and magnesium salts, the matter of calcium salt and magnesium salts Amount is than being 1:2~1:4, when selecting sodium salt and magnesium salts, the mass ratio of sodium salt and magnesium salts is 2:1~1:3.
Preferably, the inorganic salts are aluminium salt and the mixture of sodium salt.
Preferably, the aluminium salt is one of aluminium chloride or aluminum sulfate or its combination, the sodium salt for sodium metasilicate or One of sodium sulphate or its combination.
Preferably, the mass ratio of the aluminium salt and sodium salt is 1:2~1:5.
It is further preferred that above-mentioned sludge curing and stabilized curing agent, the component of following percentage by weight is included:
Portland cement 51.6%,
13 .3% of quick lime,
Bentonite 9.2%,
Kaolin 6.1%,
Zeolite 2.8%,
Aluminium salt 3.2%,
Sodium salt 9.6%,
Admixture 4.2%.
Wherein, above-mentioned aluminium salt is preferably aluminium chloride, and sodium salt is preferably sodium metasilicate.
The present invention provides the preparation method of above-mentioned sludge curing and stabilized curing agent:Each component palpus of curing agent It is solid dry powder-shaped, meets in-situ solidifying technique insecticide pressure conveying tank body and pipeline for drug character requirement, the nothing Machine salt is block if the excessive crystal of moisture content, must dehydration be ground to it is powdered can be suitable for the present invention, using preceding according to described Each component is measured, no component adds sequencing particular/special requirement, is uniformly mixed, curing agent then will be made in hermetically drying condition Lower preservation.
The present invention also provides the application of above-mentioned sludge curing and stabilized curing agent:The curing agent is passed through into specialty Sludge curing equipment in situ(As ALLU cures plate base stabilization system)It is added in sludge, using in-situ solidifying Beater operator Skill, is successively stirred by 2 dosings, and 1 not dosing self-test stirring, sludge and medicament are stirred evenly, after curing in 1 ~ 2d Sludge region surface spreads rain-proof film after curing, and then sludge to be solidified stands maintenance 7d.The addition quality of the curing agent with The mass ratio of sludge is 0.15 ~ 0.30:1.
Preferably, the mass ratio of the addition quality of the curing agent and sludge is 0.15 ~ 0.30:1.
Present invention has the advantage that:
(1)The raw material of curing agent provided by the invention are the raw materials of industry, can realize batch of curing/stabilizing material Amount production and large-scale application.
(2)The raw material of curing agent provided by the invention are pulvis character, can be suitable for in-situ solidifying mixing plant Medicament pumping system.
(3)The curing agent material of the present invention can put forward sludge early strength rapidly, can shorten solidification/stabilization sludge Curing age, in the short period of time sludge just can be used as construction platform load-bearing heavy mechanical equipment, to uncured sludge Region carries out in-situ solidifying operation.
(4)The curing agent of the present invention, which can drop, effectively suppresses harmful components activity in sludge, and Heavy Metals in Sludge etc. is had Harmful component passivation and innoxious, harmful components leaching in reduction sludge, reduce sludge for Soil Surrounding and body of groundwater pollution.
(5)The curing agent of present invention pernicious gas such as ammonia in it can suppress sludge during sludge in-situ cures whipping process Release, reduces it to operating personnel's body harm, cures medicament and do not contain harmful components in itself, will not cause secondary pollution.
Embodiment
With reference to specific embodiment, the invention will be further described, so that those skilled in the art can be more preferable Understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The sludge curing and stabilized curing agent of the present invention, includes the component of following percentage by weight:
Cement 40 ~ 60%,
Quick lime 10 ~ 20%,
Clay mineral 10 ~ 30%,
Inorganic salts 5 ~ 20%,
Admixture 3~5%.
Wherein described clay mineral is the mixture for including bentonite, kaolin and zeolite, inorganic salts are aluminium salt, calcium salt, The one of which or its two or more any combination of sodium salt, magnesium salts.
Curing agent action principle of the present invention is as follows:This curing agent is consolidated using cement-based material as structural agent as structure sludge The skeleton of agent structure;Add quick lime and clay mineral, can moisture reacts rapidly and in sludge, contain in reduction sludge Water rate, while the hydrated product of its reaction generation can increase sludge curing body intensity, while filler increase can be used as dirty Mud firming body saturation degree;Several inorganic salts that the present invention is screened have in itself promotees solidifying early strength function, while each inorganic salts ingredients Between can produce synergistic effect, mutually accelerate to promote reaction, it is common to improve solidification sludge early strength, formed after inorganic salts aquation Crystal water retention property it is good, can quickly reduce moisture percentage in sewage sludge;The admixture is a kind of inorganic polymer of optimization Polymer, its advantage function reduce moisture percentage in sewage sludge, while energy in a short time quickly can lock hydrone in sludge Enough promote the other compositions hydration reactions such as cement, clay mineral and inorganic salts, improve the hardening strengths such as aquation body, have obvious Early strength function.
According to the requirement for bearing capacity of different application project design and Practical Project, specifically used ratio is determined, it is general next The curing agent usage amount for saying the primary sludge being up to for moisture content between 85.1 ~ 95.3% is 15~30%, sludge volume per ton For 150~300kg.Then volume is higher for water content height, and then addition content is higher for requirement for bearing capacity height, and high organic content is then in mud Addition content is higher, and hardening time requires short volume higher.Using the curing agent of the present invention in practical engineering application, for average The landfill yard sludge that moisture content is 89%, the average content of organic matter is 41% adds this medicament and carries out in-situ solidifying and stabilisation, 3d Compression strength can reach 40 ~ 80kPa afterwards, and water content, which can be rapidly decreased to the unconfined compressive strength after less than 60%, 7d, to be reached 60 ~ 140kPa, and there is superior water proofing property, water stability and the hydraulicity.After curing sludge pH can be maintained at 7 ~ Between 10, while the pollutant such as heavy metal contained in sludge, pathogen is consolidated, and greatly reducing nuisance after curing, it is oozed Extracting rate, after testing, there is good environmental-protecting performance.The immersion of long-term rainwater is resistant to after tested without leaching pollutant, And can 30 tonnes of heavy mechanical equipments of load-bearing get on operation.
Embodiment 1
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 51.6%,
Quick lime 13.3%,
Clay mineral 18.1%,
Inorganic salts 12.9%,
Admixture 4.1%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium metasilicate, and the mass ratio of aluminium chloride and sodium metasilicate is 1:3.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 85.1%, the content of organic matter is 38.9% Enter 150 kg of curing agent of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 84.1kPa, moisture content 49.8% after 47.1kPa, 7d, meets Sludge landfill disposal technology index It is required that.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification standard.
Embodiment 2
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 51.6%,
Quick lime 13.3%,
Clay mineral 18.1%,
Inorganic salts 12.9%,
Admixture 4.1%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium metasilicate, and the mass ratio of aluminium chloride and sodium metasilicate is 1:3.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 95.3%, the content of organic matter is 41.6% Enter 300 kg of curing agent of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 65.1kPa, moisture content 53.8% after 41.1kPa, 7d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
(2)Embodiment 3
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 40.0%,
Quick lime 10.0%,
Clay mineral 30.0%,
Inorganic salts 15.0%,
Admixture 5.0%;
Wherein, aluminium salt is aluminum sulfate, and sodium salt is sodium metasilicate, and the mass ratio of aluminum sulfate and sodium metasilicate is 1:5.
Above-mentioned curing agent application:In the landfill yard that average moisture content per ton is 89.3%, the average content of organic matter is 41.3% 280 kg of curing agent of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength after 3d are added in sludge 78.6kPa can be reached, unconfined compressive strength reaches 137.9kPa, moisture content 42.1% after 7d, meets that Sludge landfill is disposed Technical requirement, also meets that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching Toxicity judging standard.
Embodiment 4
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 40.0%,
Quick lime 20.0%,
Clay mineral 20.0%,
Inorganic salts 17.0%,
Admixture 3.0%;
Wherein, aluminium salt is aluminum sulfate, and sodium salt is sodium sulphate, and the mass ratio of aluminum sulfate and sodium sulphate is 1:2.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 87.1%, the content of organic matter is 38.5% Enter the curing agent 240kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 64.7kPa, moisture content 55.2% after 42.9kPa, 7d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
Embodiment 5
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 60.0%,
Quick lime 20.0%,
Clay mineral 10.0%,
Inorganic salts 5.0%,
Admixture 5.0%;
Wherein, aluminium salt is aluminum sulfate, and sodium salt is sodium metasilicate, and the mass ratio of aluminum sulfate and sodium metasilicate is 1:2.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 86.5%, the content of organic matter is 40.6% Enter the curing agent 190kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 82.7kPa, moisture content 46.5% after 52.5kPa, 14d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
Embodiment 6
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 50%,
Quick lime 16.0%,
Clay mineral 10.0%,
Inorganic salts 20.0%,
Admixture 4.0%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium sulphate, and the mass ratio of aluminum sulfate and sodium sulphate is 1:2.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 92.3%, the content of organic matter is 42.5% Enter the curing agent 260kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 72.4kPa, moisture content 52.1% after 46.3kPa, 14d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
Embodiment 7
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 55.0%,
Quick lime 15.0%,
Clay mineral 22.0%,
Inorganic salts 5.0%,
Admixture 3%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium sulphate, and the mass ratio of aluminum sulfate and sodium sulphate is 1:5.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 88.5%, the content of organic matter is 38.3% Enter the curing agent 220kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 79.9kPa, moisture content 47.5% after 58.7kPa, 14d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
Embodiment 8
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 55.0%,
Quick lime 15.0%,
Clay mineral 20.0%,
Inorganic salts 5.0%,
Admixture 5.0%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium metasilicate, and the mass ratio of aluminum sulfate and sodium metasilicate is 1:5.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 90.8%, the content of organic matter is 43.3% Enter the curing agent 240kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 75.1kPa, moisture content 51.6% after 46.8kPa, 14d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
Embodiment 9
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 50.0%,
Quick lime 15.0%,
Clay mineral 19.0%,
Inorganic salts 12.0%,
Admixture 4.0%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium metasilicate, and the mass ratio of aluminum sulfate and sodium metasilicate is 1:2.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 93.5%, the content of organic matter is 42.7% Enter the curing agent 260kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 61.8kPa, moisture content 56.3% after 42.6kPa, 7d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
Embodiment 10
The present embodiment is to the sludge curing used in the sludge landfill sludge sump in-situ solidifying of Zhuhai and stabilized curing Agent is mixed according to following formulas(Percentage by weight):
Cement 50.0%,
Quick lime 15.0%,
Clay mineral 19.0%,
Inorganic salts 12.0%,
Admixture 4.0%;
Wherein, aluminium salt is aluminium chloride, and sodium salt is sodium sulphate, and the mass ratio of aluminum sulfate and sodium sulphate is 1:5.
Above-mentioned curing agent application:Add in the landfill yard sludge that moisture content per ton is 91.5%, the content of organic matter is 42.1% Enter the curing agent 260kg of said ratio, then using in-situ solidifying stirring technique, unconfined compressive strength can reach after 3d Unconfined compressive strength reaches 71.8kPa, moisture content 53.4% after 46.3kPa, 7d, meets Sludge landfill disposal technology index It is required that also meet that building is banketed intensity requirement.Sampled detection, the Steep cencentration detection of heavy metal meet leaching characteristic identification Standard.
It can be seen that from above example, curing agent of the invention, which cures sludge in-situ and stabilizes, has good processing Effect, from the point of view of the solidification effect and reagent cost after integrated treatment, curing agent and its proportioning selected by embodiment 1 and embodiment 2 It is the optimal selection in actual production.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention Enclose not limited to this.The equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention Protection domain within.Protection scope of the present invention is subject to claims.

Claims (5)

1. a kind of sludge in-situ cures and stabilized curing agent, it is characterised in that is made of the component of following percentage by weight: Cement 40 ~ 60%, quick lime 10 ~ 20%, clay mineral 10 ~ 25%, inorganic salts 5 ~ 20%, admixture 3~8%;
Wherein, the inorganic salts are aluminium salt and the mixture of sodium salt;The mass ratio of the aluminium salt and sodium salt is 1:2~1:5;It is described Clay mineral is the mixture for including bentonite, kaolin and zeolite;The admixture gathers for a kind of inorganic polymer Compound;The aluminium salt is one of aluminum sulfate or aluminium chloride or its combination, and the sodium salt is its of sodium sulphate or sodium metasilicate One of or its combination;
It is made by following steps:According to each constituent in described measurement curing agent, it is uniformly mixed.
2. sludge in-situ according to claim 1 cures and stabilized curing agent, it is characterised in that the curing agent by The component of following percentage by weight is formed:
Portland cement 51.6%,
13 .3% of quick lime,
Bentonite 9.2%,
Kaolin 6.1%,
Zeolite 2.8%,
Aluminium salt 3.2%,
Sodium salt 9.7%,
Admixture 4.1%.
3. sludge in-situ according to claim 2 cures and stabilized curing agent, it is characterised in that the aluminium salt is chlorine Change aluminium, the sodium salt is sodium metasilicate.
4. the sludge in-situ described in a kind of claim 1 cures and the application of stabilized curing agent, it is characterised in that by described in Curing agent cures mixing plant by sludge in-situ and is added in sludge, stirs evenly, and conserves.
5. sludge in-situ according to claim 4 cures and the application of stabilized curing agent, it is characterised in that described solid The addition quality of agent and the mass ratio of sludge are 0.15 ~ 0.30:1.
CN201510657325.1A 2015-10-12 2015-10-12 A kind of sludge in-situ curing and stabilized curing agent and its preparation method and application CN105217925B (en)

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