CN111960765A - Evaporation residue curing process based on garbage leachate full-quantization treatment - Google Patents
Evaporation residue curing process based on garbage leachate full-quantization treatment Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00784—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes for disposal only
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses an evaporation residue curing process based on full-scale treatment of landfill leachate, and belongs to the technical field of solid waste treatment. The evaporation residue curing process based on the full-scale treatment of the landfill leachate comprises the following steps: mixing the evaporation residue with a neutralization curing agent; the neutralization curing agent is selected from the group consisting of water-quenched slag, steel slag and furnace slag. The process disclosed by the invention completely replaces lime required to be added in the existing process, saves the cement consumption, ensures higher curing efficiency, improves the compressive strength of a cured body, avoids ammonia gas generation, and is environment-friendly, efficient and economical.
Description
Technical Field
The invention belongs to the field of solid waste treatment, and particularly relates to an evaporation residue solidification process based on full-scale treatment of landfill leachate.
Background
The landfill leachate has complex components and has the characteristics of high organic matter content, high SS content and high electrical conductivity. Most landfill sites in China enter the aging stage, and leachate is poor in biochemistry. At present, the combined process of pretreatment, biological treatment and advanced treatment is widely used, and membrane separation technologies including nanofiltration and reverse osmosis are mostly adopted for advanced treatment. The combined process can ensure that the effluent reaches the standard and is discharged, but the 20 to 30 percent of membrane filtration concentrated solution generated along with the effluent is difficult to dispose. At present, the concentrated solution is recharged in a common treatment mode, after the concentrated solution is recharged for a long time, the pressure of subsequent membrane treatment is increased, and the cost is increased. Because the recharging process does not fundamentally remove the pollutants, the full-scale treatment process of the landfill leachate is a future development trend. The treatment of the concentrated solution is used as a key ring of full-quantization treatment, and if a spray furnace burning method or a drying method is adopted for treatment, the energy consumption and the treatment cost are higher. The landfill leachate treatment by the evaporation technology is a landfill leachate treatment technology for separating pollutants from water by utilizing a physical separation principle. The evaporation temperature of the organic impurities dissolved in water in the landfill leachate is far higher than that of pure water, so that the landfill leachate is evaporated by using external energy according to the thermodynamic principle, water in the landfill leachate is evaporated before pollutants at a certain temperature and pressure, purified water is formed after condensation, and most of pollutants are accumulated in residual concentrated solution, so that the purposes of reduction and desalination are achieved. For the residual concentrated solution, if a crystallization process is adopted for disposal, high-concentration organic matters in the residual concentrated solution can influence the crystallization process, and the solidification method utilizes the solidifying agent to restrict pollutants in the evaporated residual solution, so that the pollutants are stabilized in a solidified body, and salt and the organic matters can be effectively prevented from overflowing.
The conventional evaporation residue of the garbage concentrated solution is solidified by compounding lime and cement, and the following problems exist: firstly, in order to inhibit ammonia nitrogen from transferring into condensed water in the evaporation process of the garbage concentrated solution, sulfuric acid is added for pH adjustment, so that the pH of evaporation residues is 3-5, and therefore, lime is directly added into the residues for adjustment, the use amount of lime is increased, and calcium sulfate with a retarding effect is generated to influence the solidification effect; secondly, the release of ammonia gas in the curing process can be caused by the addition of a large amount of lime, so that the environment is polluted, and the solidified body is cellular, so that the later strength of the solidified body is reduced, even pulverized, and the strength of the solidified body is lost.
In order to solve the problems, only a large amount of lime and cement can be added, and the research of the literature 'research on reverse osmosis concentrated solution for treating landfill leachate by an evaporation-solidification method' shows that: the mass ratio of the optimum cement to the lime of the mixture is about 1:2, the optimum adding amount of evaporation residual liquid (the mass is about 120g) per 100m L is 50g, and the water content of a solidified body is higher than 30%. Chinese patent publication No. CN103910481A discloses a method for treating landfill leachate membrane concentrated liquid sludge by using a novel curing agent, wherein a certain amount of curing agent is added into a certain amount of landfill leachate membrane concentrated liquid sludge and mixed uniformly, the curing agent accounts for 5 to 40 percent of the total mass, the landfill leachate membrane concentrated liquid sludge accounts for 95 to 60 percent of the total mass, and a certain amount of water is added according to the water content of the sludge to enable the water content of the mixture to be 80 to 70 percent. As can be seen from the above literature data, the requirement that the water content is less than 30% is not met in the point of water content only in GB16889-2008 'standards for controlling pollutants for municipal solid waste landfill'. Chinese patent publication No. CN109909262B discloses a method for treating co-cured waste incineration fly ash and waste concentrated solution, which comprises putting the waste incineration fly ash, a curing base material and a curing agent into a dry material mixer, mixing and stirring to form a solid mixture; and then adding the garbage concentrated solution into the solid mixture, continuously stirring, finally adding the stabilizer into the slurry solid-liquid mixture, uniformly stirring, putting into a mold, and maintaining. The curing base material, the curing agent and the stabilizer added in the curing method are more than 10, and the addition amount of the chemical agent is too large, so that although industrial solid waste is used as the curing base material, the adding device is very complicated in practical application, and the operation cost is greatly increased; the adding mass ratio of the garbage concentrated solution to all solid materials is 0.5: 1-1: 1, and obviously, the water content is more than 30%; in addition, the stabilizer is added with strong alkaline substance sodium hydroxide, which reacts with ammonia nitrogen in the concentrated solution to release ammonia gas.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and obtains the solidification process of the landfill leachate evaporation residues by mixing the landfill leachate evaporation residues with a neutralization curing agent from specific solid wastes and optimizing technical parameters, and the solidification process is effectively applied to actual engineering, thereby not only effectively reducing the release of ammonia gas, but also avoiding using a large amount of lime and cement and obtaining excellent garbage treatment effect.
The invention solves the technical problems by adopting the following technical method:
an evaporation residue solidification process based on landfill leachate full-scale treatment is characterized by comprising the following steps: mixing the evaporation residue with a neutralization curing agent; the neutralization curing agent is selected from the group consisting of water-quenched slag, steel slag and furnace slag.
The invention discloses water quenching slag, steel slag and furnace slag, which belong to solid wastes, and the invention discovers that the water quenching slag, the steel slag and the furnace slag can effectively neutralize the acidity of evaporation residues and avoid generating ammonia gas after being mixed with the evaporation residues of garbage percolate subjected to full-scale treatment, and can effectively solidify and stabilize various pollutants in the evaporation residues at the same time.
Adding a stabilizer into the slurry obtained after mixing; the stabilizer is a medium-strength acid salt;
preferably, the medium strong acid salt is selected from the group consisting of oxalate, sulfite, acetate, borate, phosphate, maleate, glutamate;
preferably, the mass ratio of the stabilizer to the evaporation residue is 1: 100-1: 10 in terms of dry materials;
the advantage of using this mass ratio is that the stabilising effect of heavy metals and ammonium ions in the residue is optimised.
The stabilizer is mainly used for assisting the neutralization curing agent to remove ammonia nitrogen, and the mechanism is as follows: the water-quenched slag, the steel slag and the slag are subjected to neutralization reaction with free sulfuric acid in the evaporation residue to generate metal ions such as calcium, magnesium, manganese and the like, and the metal ions, ammonium ions and acid radical ions form stable and insoluble composite salts (such as ammonium calcium oxalate, ammonium manganese phosphate and the like), so that the problem of ammonia gas release in the prior art is solved. The stabilizer is used for assisting the neutralization curing agent to promote the ammonia nitrogen in the landfill leachate evaporation residues to be converted into stable metal-ammonium compound salt, and the release of the stable metal-ammonium compound salt to the environment is prevented. In the aspect of inhibiting the release of ammonia gas, the neutralization curing agent selected from water-quenched slag, steel slag and the stabilizer act synergistically, the water-quenched slag, steel slag and free sulfuric acid in the evaporation residue undergo neutralization reaction to generate metal ions such as calcium, magnesium and manganese, and as mentioned above, the metal ions and acid radical ions provided by the stabilizer form metal-ammonium compound salts to stabilize ammonium radical ions, and if no stabilizer is added, the ammonium radical ions and alkaline substances in cement generate ammonia gas during the curing process, see comparative example 1 of the specific embodiment section.
Preferably, the chemical composition of the water-quenched slag, the steel slag and the slag comprises SiO2、Al2O3、CaO、Fe2O3、MgO、MnO、P2O5、SO3、TiO2；
More preferably, the particle size distribution of the water-quenched slag, the steel slag and the furnace slag is that particles with the particle size of more than 200 meshes account for 10-50% of the weight of the water-quenched slag, the steel slag and the furnace slag.
Further, adding a stabilizer, then sequentially adding cement and a regulator, and uniformly mixing to obtain a curing system;
preferably, the modifier is selected from the group consisting of polycarboxylic acids, rhamnolipids, metasilicic acid;
the function of adding cement is also to play a certain role in solidification.
The use of the above-mentioned conditioning agent in the field of waste treatment is not known in the art, and the above-mentioned conditioning agent plays two roles: first, these environmentally friendly and non-toxic modifiers can function as surfactants, primarily to adjust the flowability of the curing system at high mass concentrations, i.e., to allow for agitation at high mass concentrations. Secondly, these substances also have a stabilizing effect on heavy metals.
Preferably, the mass ratio of the regulator to the evaporation residue is 1: 300-1: 30 in terms of dry materials. The benefits of using this mass ratio are: the fluidity of the curing system can be ensured, and the proportion range is relatively economic.
Further, the curing system is transferred to a forming mold to form a cured body.
Preferably, the stabilizer is added under stirring;
preferably, the blending refers to stirring uniformly.
Specifically, the water content of the landfill leachate evaporation residue is 70-90%, and the pH value is 3-5.
The evaporation residue treated by the process has high water content, and the evaporation residue is not required to be evaporated completely, for example, the water content is less than 70 percent, and even reaches a crystalline state, so that the energy consumption can be reduced. Of course, the process of the invention can also be used for treating evaporation residues with a water content of less than 70%.
Further, the water content of slurry obtained by uniformly mixing the evaporation residue and the neutralization curing agent is 30-70%; preferably, the mass ratio of the neutralization curing agent to the evaporation residue is 1: 1-15: 1 in terms of dry materials.
The benefits of controlling at this mass ratio are: firstly, fully neutralizing acidic substances in the residues, reacting with ammonium ions in the residues, and matching the second proportion can play a role in improving the strength of a solidified body and increasing the content of coarse-particle substances.
The benefits of controlling the water cut of the slurry in the above range are: the curing system is ensured to have better fluidity, and is easy to be fully stirred, and in addition, certain water content is ensured in order to achieve a better neutralization reaction state.
Preferably, the addition amount of the cement is 5 to 25% of the total solid mass in the curing system.
Preferably, the water content of the curing system is 15% to 30%.
And further, transferring the curing system into a forming mold, and curing under natural conditions to form a cured body.
Preferably, the natural-condition maintenance finger stands at room temperature;
preferably, the natural condition curing time is 2-7 days.
The term "landfill leachate full-scale treatment" herein has the meaning of the conventional technology generally understood by those skilled in the art, and generally refers to the treatment of landfill leachate by using membrane concentration technology, and may also refer to the treatment process described in patent application CN201910166431- "landfill leachate full-scale treatment process". The invention aims to solve the problem of solidification of residue obtained after evaporation of concentrated solution, water is mainly removed by evaporation, and pollutants such as residual organic matters, heavy metals and the like are main components of the residue, so that compared with the prior art that the concentrated solution is mainly used for recharging a refuse landfill, the evaporated residue solidification process thoroughly solves the problem of the removal of the concentrated solution, and achieves real full-scale treatment.
A process for solidifying landfill leachate evaporation residues is characterized by comprising the following steps: step 1, mixing and stirring the evaporation residues of the acidic landfill leachate and a neutralization curing agent uniformly to obtain slurry; step 2, adding a stabilizer into the step 1 under a stirring state; step 3, adding cement and an activating agent into the step 2 respectively, and stirring uniformly again; and 4, transferring the curing system obtained in the step 3 into a forming die, and finally, performing compression molding to obtain a cured body meeting the requirement of safe landfill.
The invention firstly mixes and stirs the acid landfill leachate evaporation residue and the neutralization curing agent, and utilizes the reaction of acid substances in the residue and metal oxides in the neutralization curing agent to play a role of neutralization, metal ions in the neutralization curing agent enter a liquid phase, and the addition of the stabilizer promotes the combination of ammonium ions, the metal ions in the neutralization curing agent and the metal ions contained in the residue to form stable composite salt, thereby ensuring that the ammonium ions can not be released to the environment in the subsequent reaction. The slurry after mixing is added with the water regulator and the cement for stirring again, so that the stabilizing effect of the heavy metal can be enhanced, the fluidity of the stirring system under higher mass concentration can be adjusted, the stirring effect is improved, and the curing effect is ensured.
The invention also comprises the following preferred embodiments:
in the preferred scheme, the water content of the landfill leachate evaporation residues is 70-90%, and the pH value is 3-5. More preferably, the water content of the residue is 80% to 90%.
The neutralizing and curing agent selected from water-quenched slag, steel slag and slag belongs to common industrial solid wastes and is used as a filler of a curing system, wherein a coarse particle component is very beneficial to subsequent curing, and the strength of the curing system can be improved. The source of the neutralization curing agent is very wide, and the neutralization curing agent is cured subsequently, so that the invention realizes the purpose of treating wastes with processes of wastes against one another.
In a preferable scheme, the water content of slurry obtained by uniformly mixing the evaporation residue and the neutralization curing agent is 30-70%, the mass ratio of the neutralization curing agent to the evaporation residue is 1: 1-15: 1 by dry materials, and the mass ratio of the neutralization curing agent to the evaporation residue is further preferably 5: 1-15: 1 by dry materials.
In the preferred scheme, the stabilizer is a special product and has the function of promoting the ammonia nitrogen in the landfill leachate evaporation residues to be converted into stable metal-ammonium compound salt and preventing the ammonia nitrogen from being released to the environment.
In a preferred embodiment, the mass ratio of the stabilizer to the evaporation residue is 1:100 to 1:10, and more preferably, the mass ratio of the stabilizer to the evaporation residue is 1:100 to 1:50 as a dry matter.
In a preferable scheme, the regulator is one or more of polycarboxylic acid, rhamnolipid and metasilicic acid, and the mass ratio of the regulator to the evaporation residue is 1: 300-1: 30. More preferably, the mass ratio of the modifier to the evaporation residue is 1:300 to 1:100 in terms of dry matter.
In a preferred scheme, the addition amount of the cement is 5-25% of the total solid mass in the curing system.
In a preferable embodiment, the water content of the curing system is 15% to 30%.
In the preferred scheme, the stirring time in the step 1 is 1-5 minutes, the stirring time in the step 3 is 3-5 minutes, and the curing is carried out for 2-7 days under natural conditions.
The invention relates to a process for curing landfill leachate evaporation residues, which comprises the following steps: uniformly mixing the evaporation residues of the acidic landfill leachate with a neutralization curing agent to obtain slurry; adding a stabilizer into the step I under the stirring state; respectively adding cement and a regulator into the step II, and uniformly stirring again; fourthly, transferring the curing system obtained in the third step into a forming die, and curing under natural conditions to obtain a cured body which meets the requirements of safe landfill. The invention utilizes the widely available neutralization curing agent to neutralize the acidic substances in the evaporation residues, adjusts the particle size distribution of the whole curing system material and achieves the effect of treating wastes with processes of wastes against one another. Compared with the prior art, the method obviously improves the curing effect and the heavy metal stabilizing effect, and reduces the subsequent curing cost.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the landfill leachate evaporation residues are mixed with the neutralization curing agent, acidic substances in the residues are utilized to react with metal oxides in the neutralization curing agent, and meanwhile, metal ions are partially dissolved out, so that the direct reaction with cement is avoided, and alkaline substances in the cement are consumed; the addition of the stabilizer enables ammonia nitrogen to form metal-ammonia nitrogen composite salt, the metal-ammonia nitrogen composite salt is stabilized in a solidified body, the release of ammonia gas is prevented, and the environment effect is obvious.
2. The addition of the neutralization curing agent plays a role in filling a curing system, and simultaneously increases the content of coarse particles for the curing system, so that the curing system has better compressive strength, thereby replacing lime added in the prior art, reducing the addition of cement and further reducing the cost of raw materials; the solidification process of the present invention has no high concentration multiple required by the evaporation process, and the salt in the residue does not need to reach a saturated state or crystallize, so that the energy consumption of the evaporation process can be reduced, and the present invention has obvious economic effect.
3. After the regulator is added into the curing system, heavy metals in the evaporation residues can be stabilized, better fluidity of the curing body can be guaranteed under higher mass concentration, the curing system can be stirred uniformly under higher mass concentration, the curing efficiency is improved, and cement is saved.
4. The stabilizer and the regulator used in the invention are environment-friendly and nontoxic products, the usage amount is small, and the curing process can not generate secondary pollution; the neutralization curing agent is used as industrial solid waste, has wide sources, and can achieve the effect of treating waste by combining and curing the neutralization curing agent and the evaporation residues of the percolate.
Drawings
FIG. 1 shows the surface morphology of the cured product obtained in example 1, A shows the surface morphology of the cured product obtained in comparative example 1 (without adding a stabilizer), and C shows the surface morphology of the cured product obtained by the conventional process in example 4. The black spots in B and C are air holes generated by ammonia gas release, B has no gas release in the early stage because no stabilizer is added, ammonium ions are still in the curing system, once cement is added, the ammonium chloride ions react with alkaline substances in the cement to generate ammonia gas (generated in the stage), and the ammonia gas overflows to leave uneven and irregular pores in the curing system. In the step C, lime and residues are added and stirred, most ammonia gas is generated violently and overflows at the stage, and cement is added subsequently, ammonium ions contained in a curing system are not too much, so that the ammonia gas is generated mildly and greatly compared with the ammonia gas B, and air holes are relatively small and uniform.
FIG. 2 is a schematic structural diagram of a measuring device for measuring ammonia gas generated in an embodiment.
Detailed Description
The technical solution of the present invention will be further clearly and completely described below with reference to the specific embodiments and the accompanying drawings, but the protection scope of the present invention is not limited thereby.
Example 1
100Kg of landfill leachate evaporation residue with the water content of 85 percent is taken, 200Kg of water-quenched slag with the content of 25.3 percent of +200 meshes and 0.3Kg of stabilizer acetate are added, after stirring for 2 minutes, 60Kg of PC425 silicate cement and 0.1Kg of polycarboxylic acid are added, stirring is continued for 3 minutes, the mixture is loaded into a forming die, and natural curing is carried out for 3 days, 7 days, 28 days and 60 days.
Comparative example 1: only the stabilizer was not added, and the remaining conditions were the same as in example 1.
Example 2
Taking 100Kg of landfill leachate evaporation residue with the water content of 80%, adding 180Kg of steel slag with the content of +200 meshes of 35.6% and 0.25Kg of stabilizing agent oxalate, stirring for 2 minutes, adding 35Kg of PC425 silicate cement and 0.12Kg of rhamnolipid, continuously stirring for 5 minutes, loading into a forming die, and naturally curing for 3 days, 7 days, 28 days and 60 days.
Comparative example 2: only rhamnolipid is not added, arsenate is selected as a stabilizing agent, and the rest conditions are the same as those in example 2.
Example 3
100Kg of landfill leachate evaporation residue with the water content of 75 percent is taken, 130Kg of slag with the content of 31.3 percent and the content of +200 meshes and 0.35Kg of stabilizing agent sulfite are added, after stirring for 3 minutes, 40Kg of PC425 silicate cement and 0.15Kg of metasilicic acid are added, stirring is continued for 5 minutes, the mixture is loaded into a forming die, and the mixture is naturally cured for 3 days, 7 days, 28 days and 60 days.
Comparative example 3: the stabilizer borate alone was added in an amount of 0.15Kg under the same conditions as in example 3.
Comparative example 4: only metasilicic acid was added in an amount of 0.05Kg, and maleate was used as a stabilizer, under the same conditions as in example 3.
Comparative example 5: the slag of example 3 was classified so that the +200 mesh content was 8.25%, glutamate was selected as the stabilizer, and the remaining conditions were the same as in example 3.
The stabilizers of the above examples and comparative examples may also be selected from phosphates.
Example 4
Taking 100kg of landfill leachate evaporation residue with the water content of 85%, adding 200kg of lime with the content of 25.3% of +200 meshes, stirring for 2 minutes, adding 60kg of PC425 portland cement, continuing stirring for 3 minutes, loading into a forming die, and naturally curing for 3 days, 7 days, 28 days and 60 days.
The water-quenched slag, slag and steel slag adopted by the invention are solid waste materials which can be obtained by persons skilled in the art through conventional sources, for example, the water-quenched slag, slag and steel slag are obtained through industrial collection or direct commercial purchase, the change of the chemical composition content does not influence the final curing effect of the invention, and the curing treatment effect claimed by the invention can be obtained through the conventional water-quenched slag, slag and steel slag.
In the above examples, the chemical compositions of the respective neutralization curing agents are shown in table 1, and the results of the tests on the compressive strength and the impact peel resistance of the cured bodies after the curing time is completed are shown in table 2, wherein the tests are conducted for 3 days, 7 days, 28 days and 60 days; the leachate was examined by the leaching method with reference to HJ/T300 and the results are shown in Table 3.
In the above embodiment, the quality test method for generating ammonia gas is as follows: according to the apparatus of FIG. 2, 200g of the prepared curing system was taken and transferred into a conical flask, the generated gas was absorbed with 20% dilute sulfuric acid and the complete absorption was ensured, and the mass of the generated ammonia gas was obtained by measuring the mass increase of the dilute sulfuric acid, and the results are shown in Table 4.
TABLE 1 Water-quenched slag, Steel slag, and slag chemical compositions in examples (unit:%)
| Test number | SiO2 | Al2O3 | CaO | Fe2O3 | MgO | MnO | P2O5 | SO3 | TiO2 |
| Example 1 | 42.3 | 15.5 | 18.5 | 7.56 | 7.65 | 3.73 | 1.32 | 2.32 | 1.12 |
| Example 2 | 29.8 | 8.7 | 27.2 | 19.56 | 5.83 | 4.21 | 0.71 | 3.11 | 0.88 |
| Example 3 | 41.9 | 13.2 | 21.3 | 8.87 | 8.55 | 3.32 | 0.83 | 1.27 | 0.76 |
TABLE 2 examples curing test results (unit: MPa)
TABLE 3 test results (unit: mg/L) of leachate test in examples
| Test number | Hg | Cu | Zn | Pb | Cd | Be | Ba | Ni | As | Total Cr | Cr6+ | Se |
| Evaporation of residue | 0.032 | - | 56.23 | 0.22 | 0.19 | - | 23.5 | - | 0.21 | 6.2 | 2.1 | - |
| Example 1 | 0.013 | - | 1.32 | 0.11 | 0.05 | - | 1.52 | - | 0.06 | 0.76 | 0.23 | - |
| Example 2 | 0.015 | - | 2.32 | 0.13 | 0.05 | - | 1.68 | - | 0.06 | 0.89 | 0.32 | - |
| Example 3 | 0.021 | - | 2.76 | 0.09 | 0.05 | - | 1.39 | - | 0.05 | 0.72 | 0.21 | - |
| Example 4 | 0.022 | - | 2.71 | 0.11 | 0.05 | - | 2.13 | - | 0.05 | 0.79 | 0.25 | - |
| Comparative example 1 | 0.021 | - | 1.65 | 0.06 | 0.03 | - | 3.21 | - | 0.07 | 0.97 | 0.32 | - |
| Comparative example 2 | 0.025 | - | 2.61 | 0.05 | 0.03 | - | 1.39 | - | 0.06 | 0.83 | 0.31 | - |
| Comparative example 3 | 0.031 | - | 3.11 | 0.05 | 0.03 | - | 1.52 | - | 0.06 | 0.85 | 0.39 | - |
| Comparative example 4 | 0.033 | - | 3.21 | 0.06 | 0.03 | - | 1.39 | - | 0.05 | 0.78 | 0.33 | - |
| Comparative example 5 | 0.016 | - | 2.31 | 0.03 | 0.02 | - | 1.03 | - | 0.05 | 0.68 | 0.18 | - |
The above results show that: in the examples 1-3, the water content is less than 30%, the strength is more than 1Mpa in 3 days, the later strength is stably increased without attenuation, and the concentration of the leachate pollutants meets the requirements of table 1 of the domestic garbage landfill pollution control Standard (GB 16889-2008).
TABLE 4. examples and comparative examples generate ammonia gas in g
Claims (10)
1. An evaporation residue solidification process based on landfill leachate full-scale treatment is characterized by comprising the following steps: mixing the evaporation residue with a neutralization curing agent; the neutralization curing agent is selected from the group consisting of water-quenched slag, steel slag and furnace slag.
2. The evaporative residue solidification process based on the full-scale treatment of landfill leachate according to claim 1, wherein a stabilizer is added into the slurry obtained after the mixing; the stabilizer is a medium-strength acid salt;
preferably, the medium strong acid salt is selected from the group consisting of oxalate, sulfite, acetate, borate, phosphate, maleate, glutamate;
preferably, the mass ratio of the stabilizer to the evaporation residue is 1: 100-1: 10 in terms of dry materials;
preferably, the chemical compositions of the water-quenched slag, the steel slag and the slag comprise: SiO 22、Al2O3、CaO、Fe2O3、MgO、MnO、P2O5、SO3、TiO2；
More preferably, the particle size distribution of the water-quenched slag, the steel slag and the furnace slag is that particles with the particle size of more than 200 meshes account for 10-50% of the weight of the water-quenched slag, the steel slag and the furnace slag.
3. The evaporative residue curing process based on the full-scale treatment of the landfill leachate according to claim 2, wherein a curing system is obtained by adding a stabilizer, then sequentially adding cement and a regulator and uniformly mixing;
preferably, the modifier is selected from the group consisting of polycarboxylic acids, rhamnolipids, metasilicic acid;
preferably, the mass ratio of the regulator to the evaporation residue is 1: 300-1: 30 in terms of dry materials.
4. The evaporative residue curing process based on the full-scale treatment of landfill leachate according to claim 3, wherein the curing system is transferred to a forming mold to form a cured body.
5. The process for solidifying the evaporation residues based on the full-scale treatment of the landfill leachate according to claim 2, wherein the stabilizer is added under stirring;
preferably, the blending refers to stirring uniformly.
6. The evaporative residue curing process based on the full-scale treatment of landfill leachate according to any one of claims 1 to 5, wherein the landfill leachate evaporative residue has a water content of 70% to 90% and a pH of 3 to 5.
7. The evaporation residue solidification process based on the full-scale treatment of landfill leachate according to claim 1, wherein the water content of slurry obtained by uniformly mixing the evaporation residue with a neutralization curing agent is 30-70%;
preferably, the mass ratio of the neutralization curing agent to the evaporation residue is 1: 1-15: 1 in terms of dry materials.
8. The evaporative residue curing process based on the full-scale treatment of landfill leachate according to claim 3, wherein the addition amount of cement is 5% -25% of the total solid mass in the curing system;
preferably, the water content of the curing system is 15% to 30%.
9. The evaporative residue curing process based on the full-scale treatment of landfill leachate according to claim 4, wherein the curing system is transferred into a forming mold and cured under natural conditions to form a cured body.
10. The process of claim 9, wherein the natural-condition maintenance refers to standing at room temperature;
preferably, the natural condition curing time is 2-7 days.
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