CN105217925A - Solidifying agent of a kind of sludge in-situ solidification and stabilization and its preparation method and application - Google Patents
Solidifying agent of a kind of sludge in-situ solidification and stabilization and its preparation method and application Download PDFInfo
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Abstract
The present invention discloses solidifying agent of the solidification of a kind of sludge in-situ and stabilization and its preparation method and application, this solidifying agent comprises the composition of following weight percent: cement 40 ~ 60%, unslaked lime 10 ~ 20%, clay mineral 10 ~ 25%, inorganic salt 5 ~ 20%, admixture 3 ~ 8%; Wherein, described clay mineral is the mixture comprising wilkinite, kaolin and zeolite, and described inorganic salt are wherein a kind of or its two or more arbitrary combination of aluminium salt, sodium salt, calcium salt, magnesium salts, and described admixture is a kind of inorganic polymer.Solidifying agent of the present invention is applicable to sludge in-situ solidification and stabilization construction technology, can simplify processes processing sequence and difficulty, by innoxious for pollutent in mud, improve mud early strength, improve operating efficiency, reduction processing cost, and solidification effect is good.
Description
Technical field
The present invention relates to field of sludge treatment, be specifically related to solidifying agent of the solidification of a kind of sludge in-situ and stabilization and its preparation method and application.
Background technology
Mud sanitary landfill is the mode often taked in current domestic many large-scale wastewater treatment plants, reduces, stable performance through postdigestive mud organic substance content, and cumulative volume reduces, and is a kind of both economical processing mode as landfill stabilization after dehydration.The current municipal sludge generation of China is by breakthrough 3,500 ten thousand tons/year, and wherein 60 ~ 65% mud all adopt sanitary landfill mode to process.
Current China sludge disposal main method is that Sludge landfill is disposed, wherein most of sludge landfill adopts simple and easy land-fill method, do not carry out effective seepage control measure, mud itself without harmless treatment, fill out in the mud of hole containing various venomous injurant, through the erosion of rainwater and seepage contaminating action Soil Surrounding and groundwater environment, this forms larger potential safety hazard for surrounding enviroment.Landfill yard to fill out in hole that Sludge landfill amount is large, the degree of depth is comparatively dark in addition, and mud, in stream plastomer, less stable, if there is man-machine being absorbed in or dam-break accident, constitutes a threat to the security of the lives and property of periphery activity in production resident.Therefore, when certain municipal sludge landfill yard Sludge landfill amount reaches capacity, needing badly adopts an effective measure carries out disposal to landfill yard and closes, and reduces it to the security risk of periphery ecotope and resident and threat.
Sludge in-situ solidification and stabilization method of disposal is as a kind of novel mud, have few to the disturbance of sludge pit, secondary pollution is little, equipment is less, workyard is little, treatment process is simple, engineering is convenient to implement, Leachate site is not produced in solidification sludge process, operating efficiency is advantages of higher comparatively, the solidifying agent choosing sludge in-situ solidification and the stabilization effectively used is the key link of sludge in-situ curing/stabilizing disposing technique, for ensure construction safety and construction quality most important.
Summary of the invention
In order to solve the problems of the technologies described above, in-situ solidifying and stabilization treatment are carried out to the municipal sludge of sludge landfill, sludge in-situ solidification construction technology singularity must be considered, while reducing moisture percentage in sewage sludge, keep sludge curing body pH balance, effective reduction mud Leaching, prevent from solidifying objectionable constituent in rear mud to pollute Soil Surrounding and body of groundwater, also must improve solidification sludge early strength simultaneously, so that mud to get on operation as operation platform load-bearing heavy mechanical equipment after solidification, ensure construction speed and safety, the present invention provides solidifying agent of the solidification of a kind of sludge in-situ and stabilization and its preparation method and application.
The invention provides the solidifying agent of the solidification of a kind of sludge in-situ and stabilization, comprise the composition of following weight percent:
Cement 40 ~ 60%,
Unslaked lime 10 ~ 20%,
Clay mineral 10 ~ 30%,
Inorganic salt 5 ~ 20%,
Admixture 3 ~ 5%.
Described solidifying agent is solid dry powder, and above each moiety is solid dry powder, granular size is without concrete particular particle size requirement, the ratio of each moiety calculated with percent purity form, and the ratio of each component shared by solidifying agent is all select the material of the purity of 100% to calculate.
Wherein said clay mineral comprises wilkinite, kaolin and zeolite, mixes, and wherein the weight percent of wilkinite, kaolin and zeolite is: wilkinite 40 ~ 70%, kaolin 20 ~ 40%, zeolite 10 ~ 20%.Preferably, in described clay mineral, the mass ratio of wilkinite, kaolin and zeolite is 50.8:33.7:15.5.Described admixture is inorganic polymer.
Preferred further, wherein said inorganic salt are wherein a kind of or its two kinds of arbitrary combination of aluminium salt, calcium salt, sodium salt, magnesium salts.When described inorganic salt select aluminium salt, calcium salt, sodium salt, in magnesium salts two groups when combining, the proportionlity of concrete two kinds of components 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, the mass ratio of aluminium 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 that 1:3 ~ 1:4 is 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 mass ratio of calcium salt and magnesium salts is 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, described inorganic salt are the mixture of aluminium salt and sodium salt.
Preferably, described aluminium salt is one of them or its combination of aluminum chloride or Tai-Ace S 150, and described sodium salt is one of them or its combination of water glass or sodium sulfate.
Preferably, the mass ratio of described aluminium salt and sodium salt is 1:2 ~ 1:5.
Further preferably, above-mentioned sludge curing and the solidifying agent of stabilization, comprise the composition of following weight percent:
Silicate cement 51.6%,
Unslaked lime 13.3%,
Wilkinite 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 aluminum chloride, and sodium salt is preferably water glass.
The invention provides the preparation method of the solidifying agent of above-mentioned sludge curing and stabilization: each composition of described solidifying agent must be solid dry powder, meeting in-situ solidifying technique insecticide pressure carries tank body and pipeline for drug character requirement, if the crystal bulk that described inorganic salt water ratio is too high, dehydration must be ground to and Powderedly can be applicable to the present invention, each composition is measured described in complying with before using, sequencing particular requirement is added without composition, mix, then will make solidifying agent and preserve under hermetically drying condition.
The present invention also provides the application of the solidifying agent of above-mentioned sludge curing and stabilization: add in mud by described solidifying agent by professional original position sludge curing equipment (as ALLU solidifies plate base stabilization system), adopt in-situ solidifying stirring technique, successively stir through 2 dosings, 1 not dosing self-inspection is stirred, mud and medicament are stirred, after solidification, in 1 ~ 2d, mud region surface spreads rainproof film after hardening, and then mud to be solidified leaves standstill maintenance 7d.The interpolation quality of described solidifying agent and the mass ratio of mud are 0.15 ~ 0.30:1.
Preferably, the interpolation quality of described solidifying agent and the mass ratio of mud are 0.15 ~ 0.30:1.
The advantage that the present invention has is:
(1) starting material of solidifying agent provided by the invention are all industrial raw material, can realize batch production and the large-scale application of curing/stabilizing material.
(2) starting material of solidifying agent provided by the invention are pulvis proterties, can be applicable to in-situ solidifying whipping device medicament pumping system.
(3) solidifying agent material of the present invention can put forward rapidly mud early strength, the curing age of solidification/stabilization sludge can be shortened, mud just as operation platform load-bearing heavy mechanical equipment, can carry out in-situ solidifying operation to uncured mud region in the short period of time.
(4) solidifying agent of the present invention can fall and effectively suppress objectionable constituent in mud active, by objectionable constituent passivation such as Heavy Metals in Sludge and innoxious, reduces objectionable constituent in mud and leaches, reduce mud and pollute for Soil Surrounding and body of groundwater.
(5) solidifying agent of the present invention can to suppress in mud the obnoxious flavour releases such as ammonia in sludge in-situ solidification whipping process, reduces it to operating personnel's body harm, and solidification medicament itself, containing objectionable constituent, can not cause secondary pollution.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
The solidifying agent of sludge curing of the present invention and stabilization, comprises the composition of following weight percent:
Cement 40 ~ 60%,
Unslaked lime 10 ~ 20%,
Clay mineral 10 ~ 30%,
Inorganic salt 5 ~ 20%,
Admixture 3 ~ 5%.
Wherein said clay mineral is the mixture comprising wilkinite, kaolin and zeolite, and inorganic salt are wherein a kind of or its two or more arbitrary combination of aluminium salt, calcium salt, sodium salt, magnesium salts.
Solidifying agent action principle of the present invention is as follows: this solidifying agent take cement-based material as structural agent, as the skeleton building sludge solidifying agent structure; Add unslaked lime and clay mineral, can react by moisture rapidly and in mud, reduce water ratio in mud, hydrated product that its reaction generates simultaneously can increase sludge curing body intensity, can increase sludge curing body saturation ratio as weighting agent simultaneously; Several inorganic salt itself that the present invention screens have short solidifying early strength function, can produce synergy between each inorganic salts ingredients, mutual acceleration promotes reaction simultaneously, common raising solidification sludge early strength, the crystal water retention property formed after inorganic salt aquation is good, can reduce moisture percentage in sewage sludge fast; Described admixture is a kind of inorganic polymer of optimization, its advantage function is can be quick by water molecules locking in mud at short notice, reduce moisture percentage in sewage sludge, other composition hydration reactions such as cement, clay mineral and inorganic salt can be promoted simultaneously, improve the hardening strengths such as aquation body, there is obvious early strength function.
According to the design of different application projects and the requirement for bearing capacity of Practical Project, determine concrete usage ratio, be in general 15 ~ 30% for water ratio up to the solidifying agent usage quantity of the primary sludge between 85.1 ~ 95.3%, mud volume per ton is 150 ~ 300kg.Water content height then volume is higher, and requirement for bearing capacity height then addition content is higher, and in mud, then addition content is higher for organic content height, requires that short volume is higher set time.Use solidifying agent of the present invention in practical engineering application, for average moisture content be 89%, average organic content be 41% landfill yard mud add this medicament and carry out in-situ solidifying and stabilization, after 3d, ultimate compression strength can reach 40 ~ 80kPa, water content can be down to less than 60% rapidly, unconfined compression strength after 7d can reach 60 ~ 140kPa, and has the feature of superior water-repellancy, water stability and the hydraulicity.After solidification, sludge pH can remain between 7 ~ 10, and simultaneously contained in the mud pollutent such as heavy metal, pathogenic agent, by consolidation, greatly reduces its rate of release of nuisance, after testing, has good environmental-protecting performance after solidification.After tested can resistance to long-term rainwater immersion and there will not be leaching pollutent, and load-bearing 30 tonnes of heavy mechanical equipments to get on operation.
Embodiment 1
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 51.6%,
Unslaked lime 13.3%,
Clay mineral 18.1%,
Inorganic salt 12.9%,
Admixture 4.1%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is water glass, and the mass ratio of aluminum chloride and water glass is 1:3.
The application of above-mentioned solidifying agent: water ratio per ton be 85.1%, organic content is the solidifying agent 150kg adding said ratio in the landfill yard mud of 38.9%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 47.1kPa, after 7d, unconfined compression strength reaches 84.1kPa, water ratio is 49.8%, meets Sludge landfill disposal technology index request.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 2
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 51.6%,
Unslaked lime 13.3%,
Clay mineral 18.1%,
Inorganic salt 12.9%,
Admixture 4.1%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is water glass, and the mass ratio of aluminum chloride and water glass is 1:3.
The application of above-mentioned solidifying agent: water ratio per ton be 95.3%, organic content is the solidifying agent 300kg adding said ratio in the landfill yard mud of 41.6%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 41.1kPa, after 7d, unconfined compression strength reaches 65.1kPa, water ratio is 53.8%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
(2) embodiment 3
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 40.0%,
Unslaked lime 10.0%,
Clay mineral 30.0%,
Inorganic salt 15.0%,
Admixture 5.0%;
Wherein, aluminium salt is Tai-Ace S 150, and sodium salt is water glass, and the mass ratio of Tai-Ace S 150 and water glass is 1:5.
The application of above-mentioned solidifying agent: average moisture content per ton be 89.3%, average organic content is the solidifying agent 280kg adding said ratio in the landfill yard mud of 41.3%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 78.6kPa, after 7d, unconfined compression strength reaches 137.9kPa, water ratio is 42.1%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 4
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 40.0%,
Unslaked lime 20.0%,
Clay mineral 20.0%,
Inorganic salt 17.0%,
Admixture 3.0%;
Wherein, aluminium salt is Tai-Ace S 150, and sodium salt is sodium sulfate, and the mass ratio of Tai-Ace S 150 and sodium sulfate is 1:2.
The application of above-mentioned solidifying agent: water ratio per ton be 87.1%, organic content is the solidifying agent 240kg adding said ratio in the landfill yard mud of 38.5%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 42.9kPa, after 7d, unconfined compression strength reaches 64.7kPa, water ratio is 55.2%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 5
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 60.0%,
Unslaked lime 20.0%,
Clay mineral 10.0%,
Inorganic salt 5.0%,
Admixture 5.0%;
Wherein, aluminium salt is Tai-Ace S 150, and sodium salt is water glass, and the mass ratio of Tai-Ace S 150 and water glass is 1:2.
The application of above-mentioned solidifying agent: water ratio per ton be 86.5%, organic content is the solidifying agent 190kg adding said ratio in the landfill yard mud of 40.6%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 52.5kPa, after 14d, unconfined compression strength reaches 82.7kPa, water ratio is 46.5%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 6
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 50%,
Unslaked lime 16.0%,
Clay mineral 10.0%,
Inorganic salt 20.0%,
Admixture 4.0%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is sodium sulfate, and the mass ratio of Tai-Ace S 150 and sodium sulfate is 1:2.
The application of above-mentioned solidifying agent: water ratio per ton be 92.3%, organic content is the solidifying agent 260kg adding said ratio in the landfill yard mud of 42.5%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 46.3kPa, after 14d, unconfined compression strength reaches 72.4kPa, water ratio is 52.1%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 7
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 55.0%,
Unslaked lime 15.0%,
Clay mineral 22.0%,
Inorganic salt 5.0%,
Admixture 3%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is sodium sulfate, and the mass ratio of Tai-Ace S 150 and sodium sulfate is 1:5.
The application of above-mentioned solidifying agent: water ratio per ton be 88.5%, organic content is the solidifying agent 220kg adding said ratio in the landfill yard mud of 38.3%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 58.7kPa, after 14d, unconfined compression strength reaches 79.9kPa, water ratio is 47.5%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 8
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 55.0%,
Unslaked lime 15.0%,
Clay mineral 20.0%,
Inorganic salt 5.0%,
Admixture 5.0%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is water glass, and the mass ratio of Tai-Ace S 150 and water glass is 1:5.
The application of above-mentioned solidifying agent: water ratio per ton be 90.8%, organic content is the solidifying agent 240kg adding said ratio in the landfill yard mud of 43.3%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 46.8kPa, after 14d, unconfined compression strength reaches 75.1kPa, water ratio is 51.6%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 9
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 50.0%,
Unslaked lime 15.0%,
Clay mineral 19.0%,
Inorganic salt 12.0%,
Admixture 4.0%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is water glass, and the mass ratio of Tai-Ace S 150 and water glass is 1:2.
The application of above-mentioned solidifying agent: water ratio per ton be 93.5%, organic content is the solidifying agent 260kg adding said ratio in the landfill yard mud of 42.7%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 42.6kPa, after 7d, unconfined compression strength reaches 61.8kPa, water ratio is 56.3%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Embodiment 10
The solidifying agent of the present embodiment to Zhuhai sludge landfill sludge pit in-situ solidifying sludge curing used and stabilization mixes (weight percent) according to following formula:
Cement 50.0%,
Unslaked lime 15.0%,
Clay mineral 19.0%,
Inorganic salt 12.0%,
Admixture 4.0%;
Wherein, aluminium salt is aluminum chloride, and sodium salt is sodium sulfate, and the mass ratio of Tai-Ace S 150 and sodium sulfate is 1:5.
The application of above-mentioned solidifying agent: water ratio per ton be 91.5%, organic content is the solidifying agent 260kg adding said ratio in the landfill yard mud of 42.1%, then in-situ solidifying stirring technique is adopted, after 3d, unconfined compression strength can reach 46.3kPa, after 7d, unconfined compression strength reaches 71.8kPa, water ratio is 53.4%, meet Sludge landfill disposal technology index request, also meet building and to banket requirement of strength.Detect through sampling, the Steep cencentration of heavy metal detects and meets leaching characteristic identification standard.
Can find out from above embodiment, solidifying agent of the present invention has good treatment effect to sludge in-situ solidification and stabilization, solidification effect after comprehensive treating process and reagent cost, solidifying agent and proportioning thereof selected by embodiment 1 and embodiment 2 are the optimal selections in actual production.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. a solidifying agent for sludge in-situ solidification and stabilization, is characterized in that, comprise the composition of following weight percent: cement 40 ~ 60%, unslaked lime 10 ~ 20%, clay mineral 10 ~ 25%, inorganic salt 5 ~ 20%, admixture 3 ~ 8%.
2. the solidifying agent of sludge in-situ solidification according to claim 1 and stabilization, it is characterized in that, described clay mineral is the mixture comprising wilkinite, kaolin and zeolite; Described inorganic salt are wherein one or both arbitrary combination of aluminium salt, sodium salt, calcium salt, magnesium salts; Described admixture is a kind of inorganic polymer.
3. the solidifying agent of sludge in-situ solidification according to claim 2 and stabilization, it is characterized in that, described inorganic salt are the mixture of aluminium salt and sodium salt.
4. the solidifying agent of sludge in-situ solidification according to claim 3 and stabilization, it is characterized in that, the mass ratio of described aluminium salt and sodium salt is 1:2 ~ 1:5.
5. the solidifying agent of sludge in-situ according to claim 4 solidification and stabilization, is characterized in that, described aluminium salt is one of them or its combination of Tai-Ace S 150 or aluminum chloride, and described sodium salt is that one of them or its of sodium sulfate or water glass combines.
6., according to the sludge in-situ solidification in claim 1-5 described in any one and the solidifying agent of stabilization, it is characterized in that, described solidifying agent comprises the composition of following weight percent:
Silicate cement 51.6%,
Unslaked lime 13.3%,
Wilkinite 9.2%,
Kaolin 6.1%,
Zeolite 2.8%,
Aluminium salt 3.2,
Sodium salt 9.7,
Admixture 4.1%.
7. the solidifying agent of sludge in-situ solidification according to claim 6 and stabilization, it is characterized in that, described aluminium salt is aluminum chloride, and described sodium salt is water glass.
8. a preparation method for the solidifying agent of sludge in-situ solidification according to claim 1 and stabilization, is characterized in that, measure each moiety in this solidifying agent, mix described in complying with.
9. an application for the solidifying agent of sludge in-situ solidification according to claim 1 and stabilization, is characterized in that, adds in mud, stirs, maintenance by described solidifying agent by sludge in-situ solidification whipping device.
10. the application of the solidifying agent of sludge in-situ solidification according to claim 9 and stabilization, it is characterized in that, the interpolation quality of described solidifying agent and the mass ratio of mud are 0.15 ~ 0.30:1.
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