WO2023226321A1 - 一种填埋场覆土用改性市政污泥及其制备方法 - Google Patents

一种填埋场覆土用改性市政污泥及其制备方法 Download PDF

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WO2023226321A1
WO2023226321A1 PCT/CN2022/131837 CN2022131837W WO2023226321A1 WO 2023226321 A1 WO2023226321 A1 WO 2023226321A1 CN 2022131837 W CN2022131837 W CN 2022131837W WO 2023226321 A1 WO2023226321 A1 WO 2023226321A1
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municipal sludge
fly ash
cement
incineration fly
waste incineration
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PCT/CN2022/131837
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English (en)
French (fr)
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徐浩青
姜朋明
周爱兆
齐永正
吴涛
吴思麟
刘顺青
侯贺营
施鑫淼
梁景瑞
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江苏科技大学
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Publication of WO2023226321A1 publication Critical patent/WO2023226321A1/zh

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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
    • 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
    • C04B18/0418—Wet materials, e.g. slurries
    • 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
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/10—Burned or pyrolised refuse
    • C04B18/105—Gaseous combustion products or dusts collected from waste incineration, e.g. sludge resulting from the purification of gaseous combustion products of waste incineration
    • C04B18/106—Fly ash from waste incinerators
    • 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
    • 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
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/30—Landfill technologies aiming to mitigate methane emissions

Definitions

  • the invention belongs to the field of sludge resource utilization, and specifically relates to a modified municipal sludge for covering soil in landfills and a preparation method thereof.
  • Municipal sludge is a by-product produced during sewage treatment and is the suspended matter that settles in sewage.
  • Municipal sludge is rich in organic matter and has very complex composition and properties. It is mainly composed of protein and lignin and is a semi-solid waste.
  • the purpose of the present invention is to provide a modified municipal sludge for covering soil in landfills.
  • the modified municipal sludge has the conditions for covering soil materials.
  • a modified municipal sludge for landfill covering including municipal sludge, waste incineration fly ash and cement.
  • the mass ratio of the municipal sludge to waste incineration fly ash and cement is 1.8-2.2, that is Municipal sludge/(cement + garbage incineration fly ash) is between 1.8-2.2, 2 is preferred.
  • the mass ratio of waste incineration fly ash to the sum of the mass of waste incineration fly ash and cement is 0.4-0.8, that is, waste incineration fly ash/(cement + waste incineration fly ash), with 0.8 being preferred.
  • waste incineration fly ash is mainly produced in grate furnaces in municipal solid waste incineration power plants. In order to be suitable for stirring, it is ground into powder and passed through a 35-mesh sieve with a particle size of 0.1-0.5 mm. Power plants invest a large amount of lime in the waste incineration process to reduce acid gas emissions, resulting in excess CaO in waste incineration fly ash.
  • the municipal sludge is mainly obtained after dehydration in sewage treatment plants, with a weight of 10.3-10.5kN/m3, a plastic limit of 50% to 60%, a liquid limit of 110% to 120%, a moisture content of 365%, and an organic matter of 32 %, for wet base materials.
  • the cement is ordinary Portland P.O42.5 cement with a fineness of 0.08mm.
  • a method for preparing the above-mentioned modified municipal sludge for covering soil in landfills The specific steps are: mix municipal sludge with waste incineration fly ash and cement for 8-12 minutes, and then maintain it for 20-28 hours to serve as a rainwater-rich area.
  • the landfill is used as covering material, and municipal sludge is a wet base material, so no additional water is needed during mixing.
  • the waste incineration fly ash is ground into powder and passed through a 35-mesh sieve so that the particle size is 0.1-0.5 mm.
  • the waste incineration fly ash is baked in an environment with a temperature of 70-75°C for 20-28 hours, preferably 24 hours, before grinding.
  • Modified municipal sludge used to cover landfills is more suitable for humid and rain-rich landfill environments.
  • Solidifying sludge has the advantages of large processing capacity and short time.
  • the solidification method is used to modify and reuse municipal sludge with high moisture content and low strength. It can be used in landfills, covering soil, foundation materials, etc.
  • the present invention has the following advantages:
  • waste incineration fly ash to replace part of the cement-modified municipal sludge can save cement consumption, recycle waste incineration fly ash, and reduce costs.
  • the permeability of municipal sludge modified by this method is higher than that of solidified sludge modified by pure cement.
  • Figure 1 is a schematic diagram of landfill coverage
  • Figure 2 is a permeability coefficient change curve diagram according to Embodiment 1 of the present invention.
  • Figure 3 is a permeability coefficient change curve diagram according to Embodiment 2 of the present invention.
  • Figure 4 is a change curve of permeability coefficient according to Embodiment 3 of the present invention.
  • the cement used in the following examples can be ordinary Portland P.O42.5 cement that is well known to those skilled in the art, and is not particularly limited.
  • the Portland cement used in the following examples has a specific gravity of 3.0 to 3.2, a fineness of 0.08mm, a sieve residue of ⁇ 10%, an initial setting time of ⁇ 45min, a final setting time of ⁇ 10h, a 28d compressive strength of ⁇ 42.5MPa, and an SO3 content. ⁇ 3.5%, MgO content ⁇ 5.0%, loss on ignition ⁇ 5.0%.
  • Waste incineration fly ash is produced from waste incineration power plants and is produced by grate furnaces.
  • Municipal sludge is dewatered sludge from sewage treatment plants.
  • the municipal sludge used in the following examples has a specific gravity of 2.1 to 2.2, a weight of 10.3 to 10.5kN/m3, a plastic limit of 50% to 60%, a liquid limit of 110% to 120%, a moisture content of 356%, and an organic matter of 32%.
  • Waste incineration fly ash is prepared by the following method: place the original fly ash in an environment with a temperature of 70 to 75°C, bake for 24 hours, grind it with a high-speed pulverizer, and pass through a 35-mesh sieve to obtain the waste incineration fly ash.
  • the high-speed grinder used is commercially available.
  • the municipal sludge modified by this method is used as landfill covering material.
  • the construction is carried out according to the structure in Figure 1, including the daily covering soil layer, the middle covering soil layer and the garbage layer, in which the above modified municipal sludge is used as
  • the materials for the middle layer of soil cover have higher permeability and strength requirements than the materials for the daily cover soil layer.
  • the sequence and method can be in accordance with methods well known to those skilled in the art.
  • modified municipal sludge 1,334kg of municipal sludge, 267kg of waste incineration fly ash, and 400kg of cement are mixed to prepare modified municipal sludge.
  • the test results are shown in Figure 2.
  • the density is about 2000kg/m3; the measured 7d unconfined compressive strength reaches 146kPa, the 28d unconfined compressive strength reaches 338kPa; the 28d cohesion c reaches 124kPa, the internal friction angle ⁇ is 12° ⁇ 15°; the permeability coefficient varies with It gradually decreases with increasing age, and the permeability coefficient is basically maintained at the order of 10-7cm/s.
  • the mechanical strength and permeability coefficient meet the requirements of temporary covering materials for landfills.
  • the permeability remains stable in the later period and the strength continues to grow.
  • modified municipal sludge 1,340kg of municipal sludge, 402kg of waste incineration fly ash, and 268kg of cement are mixed to prepare modified municipal sludge.
  • the test results are shown in Figure 3.
  • the density is about 2010kg/m3; the measured unconfined compressive strength at 7d reaches 55kPa, and the unconfined compressive strength at 28d reaches 280kPa; the cohesion c reaches 59kPa at 28d, and the internal friction angle ⁇ is 25° ⁇ 27°; the permeability coefficient varies with It gradually decreases with increasing age, and the permeability coefficient is basically maintained at the order of 10-7cm/s.
  • modified municipal sludge 1,340 kg of municipal sludge, 536 kg of waste incineration fly ash, and 134 kg of cement are mixed to prepare modified municipal sludge.
  • the test results are shown in Figure 4.
  • the density is about 2010kg/m3; the measured unconfined compressive strength at 7 days reaches 56kPa, and the unconfined compressive strength at 28 days reaches 86kPa; the cohesion c reaches 30kPa at 28 days, and the internal friction angle ⁇ is 2° ⁇ 6°; the permeability coefficient varies with It gradually decreases with increasing age, and the permeability coefficient is basically maintained at the order of 10-7cm/s.
  • the mechanical strength and permeability coefficient in the later stage meet the requirements of the temporary covering material of the landfill, the permeability remains stable in the later stage, and the strength continues to grow.
  • modified municipal sludge 1,334kg of municipal sludge, 267kg of waste incineration fly ash, and 400kg of cement are mixed to prepare modified municipal sludge.
  • the density is about 2000kg/m3; the measured 7d unconfined compressive strength reaches 199kPa, the 28d unconfined compressive strength reaches 228kPa; the 28d cohesion c reaches 106kPa, the internal friction angle ⁇ is 29° ⁇ 34°; the permeability coefficient is basically Maintained on the order of 10-7cm/s.
  • modified municipal sludge 1,340kg of municipal sludge, 402kg of waste incineration fly ash, and 268kg of cement are mixed to prepare modified municipal sludge.
  • the density is about 2010kg/m3; the measured 7d unconfined compressive strength reaches 70kPa, the 28d unconfined compressive strength reaches 112kPa; the 28d cohesion c reaches 31kPa, the internal friction angle ⁇ is 3° ⁇ 4°; the permeability coefficient is basically Maintained on the order of 10-7cm/s.
  • modified municipal sludge 1,340 kg of municipal sludge, 536 kg of waste incineration fly ash, and 134 kg of cement are mixed to prepare modified municipal sludge.
  • the density is about 2010kg/m3; the measured unconfined compressive strength at 7d reaches 26kPa, and the unconfined compressive strength at 28d reaches 50kPa; the cohesion c reaches 29kPa at 28d, the internal friction angle ⁇ is 0° ⁇ 1°; the permeability coefficient is basically Maintained on the order of 10-7cm/s.
  • This modified municipal sludge is suitable for environments with abundant rainwater, so it is more suitable for wet and rainwater-rich landfill environments.
  • Utilizing waste incineration fly ash to replace part of the cement-modified municipal sludge can save cement consumption, recycle waste incineration fly ash, and reduce costs.
  • the pores of the municipal sewage sludge are increased so that the permeability of the modified municipal sludge meets the requirements of the landfill covering material.
  • the pozzolanic nature of waste incineration fly ash is used to modify municipal sludge together with cement, effectively enhancing the later strength development of the modified municipal sludge.
  • waste incineration fly ash to modify municipal sludge and use it as landfill covering material to reduce the use of other soil materials and save landfill space.

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Abstract

本发明具体公开了一种填埋场覆土用改性市政污泥，利用垃圾焚烧飞灰与水泥改性市政污泥，按以下步骤进行：飞灰粒径0.1～0.5mm，水泥为普通硅酸盐P.O42.5水泥，根据质量比配比，市政污泥/(水泥+垃圾焚烧飞灰)＝2，混合搅拌10min，养护24h即可作为雨水丰富地区填埋场覆土材料使用；市政污泥工程性质差，直接回收利用难度大，本发明通过对固化剂原料的选取以及配合比优化，使改性后的市政污泥具备覆土材料条件，强度可达250kPa；该方法以废治废，有效提高处理市政污泥的效率，减少水泥材料的使用，具有显著的经济效益和环保性。

Description

一种填埋场覆土用改性市政污泥及其制备方法 技术领域
本发明属于污泥的资源化领域，具体涉及一种填埋场覆土用改性市政污泥及其制备方法。
背景技术
市政污泥是在处理污水时产生的一种副产物，是污水中沉淀下来的悬浮物质。市政污泥富含有机质，成分与性质十分复杂，主要由蛋白质与木质素组成，属于半固体废弃物。
随着我国对污水处理的重视程度以及处理技术的提高，污水处置量大幅提高，市政污泥的产量也随之上升。据住建部城乡建设统计年鉴了解，截止2020年，我国共有城市污水处理厂2618座，处理能力为19267万m 3/d，污水年排放量达5713633万m 3，污水年处理量为5572782万m3，污水处理率达97.53％，全国干污泥产量超过1000万吨。按照污泥中有机质与水的含量为400％估算，2020年我国市政污泥的产出超过5000万吨。
但是，我国对污水处置的过程中存在较为严重的“重污水轻污泥”的现象，重点关注污水的处理与排放标准，而对污泥的处理相对忽略。我国对于市政污泥常规的处理手段有建材、焚烧、土地利用、填埋以及废弃。仅仅20％左右的市政污泥得到安全合理的处置，绝大部分的污泥被弃置或者不合理的处理，造成资源的严重浪费。同时，不合理的处置方式也易造成市政污泥对环境的二次污染，影响居民居住条件。污水处理后产出的污泥大多数没有经过处理，直接堆弃于陆地的低洼处，是不少地区的临时处理措施。
常规的几种处理手段已无法满足对大量的市政污泥的处置，目前发展的方向大致分为3个方面：减量、无害、再利用。
发明内容
有鉴于此，本发明的目的在于提供一种填埋场覆土用改性市政污泥，通过对固化剂原料的选取以及配合比优化，使改性后的市政污泥具备覆土材料的条件。
本发明的技术方案是：
一种填埋场覆土用改性市政污泥，包括市政污泥、垃圾焚烧飞灰和水泥，市政污泥的质量与垃圾焚烧飞灰和水泥两者的质量和比为1.8-2.2，也即市政污泥/(水泥+垃圾焚烧飞灰)在1.8-2.2之间，优先选择2。
优选的，垃圾焚烧飞灰的质量与垃圾焚烧飞灰和水泥的质量和比为0.4-0.8，也即垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)，优先选择0.8。
优选的，垃圾焚烧飞灰主要于城市生活垃圾焚烧发电厂，由炉排炉产生，为了适合搅拌，将其研磨至粉末状，过35目筛，粒径0.1-0.5mm。发电厂在垃圾焚烧过程中为减少酸性气体排放而投入的大量石灰，致使垃圾焚烧飞灰中存在过量的CaO。
优选的，所述市政污泥主要为污水处理厂脱水后得到，其重度为10.3-10.5kN/m3，塑限50％～60％，液限110％～120％，含水率365％，有机质32％，为湿基材料。
优选的，水泥为普通硅酸盐P.O42.5水泥，细度为0.08mm。
一种上述填埋场覆土用改性市政污泥的制备方法，具体步骤为：将市政污泥与垃圾焚烧飞灰和水泥混合搅拌8-12min，然后养护20-28h，即可作为雨水丰富地区填埋场覆土材料使用，有市政污泥为湿基材料，搅拌时不需要额外加水。
优选的，垃圾焚烧飞灰混合之前研磨至粉末状，过35目筛，使得粒径为0.1-0.5mm。
优选的，垃圾焚烧飞灰在研磨之前在温度为70-75℃的环境中烘烤20-28h，优选24h。
填埋场覆土用改性市政污泥更适用于潮湿、雨水丰富的填埋场环境。
将污泥固化具有处理量大、时间短等优点，运用固化的方式将含水率高、强度低的市政污泥改性再利用，可以运用于填埋场、覆土、地基材料等方面。
本发明与现有技术相比，具有以下优点：
1、利用垃圾焚烧飞灰替代部分水泥改性市政污泥，可以节约水泥用量，将垃圾焚烧飞灰资源化，降低成本。
2、利用垃圾焚烧飞灰的粒径较大且颗粒表面存在大量孔隙的特点，该方法改性后的市政污泥的渗透性高于纯水泥改性的固化污泥。
3、利用垃圾焚烧飞灰的火山灰性，可以有效提高改性市政污泥后期强度的发展。
4、利用垃圾焚烧飞灰改性市政污泥，将其作为填埋场覆土材料，减少其余土材料的使用，节约填埋场空间。
附图说明
图1为填埋场覆盖示意图；
其中：1-垃圾，2-中层覆土，3-日覆土；
图2为本发明实施例1所述的渗透系数变化曲线图；
图3为本发明实施例2所述的渗透系数变化曲线图；
图4为本发明实施例3所述的渗透系数变化曲线图。
具体实施方式
为了加深对本发明的理解，下面将结合附图和实施例对本发明做进一步详细描述，该实施例仅用于解释本发明并不对保护范围构成限定。
以下实施例所采用的水泥为本领域技术人员熟知的普通硅酸盐P.O42.5水泥即可，并无特殊的限制。以下实施例所采用的硅酸盐水泥其比重为3.0～3.2，细度0.08mm，筛余≤10％，初凝时间≥45min，终凝时间≤10h，28d抗压强度≥42.5MPa，SO3含量≤3.5％，MgO含量≤5.0％，烧失量≤5.0％。
垃圾焚烧飞灰产自垃圾焚烧发电厂，由炉排炉产生。以下实施例所采用的垃圾焚烧飞灰比重为2.5～2.6，最大粒径不超过0.5mm，其平均粒径d50＝0.3mm，堆积密度为1.0～1.1g/cm3，CaO含量≥40％，SiO2含量≥2％。
市政污泥为污水处理厂脱水后的污泥。以下实施例所采用的市政污泥比重2.1～2.2，重度10.3～10.5kN/m3，塑限50％～60％，液限110％～120％，含水率356％，有机质32％。
垃圾焚烧飞灰通过如下方法制备得到：将原状飞灰置于温度为70～75℃的环境中，烘烤24h，用高速粉碎机研磨，过35目筛，得到所述垃圾焚烧飞灰。所用的高速粉碎机为市售。
改性市政污泥通过如下方法制备得到：按质量比计，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.4-0.8，混合均匀飞灰与水泥作为改性剂，取市政污泥/(垃圾焚烧飞灰+水泥)＝2，将改性剂加入市政污泥中，搅拌10min至均匀状态，养护24h即可作为填埋场覆土使用。
该方法改性的市政污泥用作填埋场覆土材料，在实际施工时，按照图1的结构进行施工，包括日覆土层、中层覆土层和垃圾层，其中以上改性的市政污泥作为中层覆土的材料，其相较于日覆土层的材料对渗透性和强度要求更高，顺序与方法按照本领域技术人员熟知的方法即可。
实施例1
改性市政污泥包含以下原料：垃圾焚烧飞灰、水泥以及市政污泥，其中，按质量比计，市政污泥/(垃圾焚烧飞灰+水泥)＝2，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.4。
具体的，以每立方改性市政污泥计，将1334kg市政污泥、267kg垃圾焚烧飞灰、400kg水泥搅拌混合，制得改性市政污泥。
性能测试
根据现有规范《土工试验方法标准》(GB/T50123-2019)进行测试，养护条件为水下养护。
测试结果如图2所示。密度约为2000kg/m3；实测7d无侧限抗压强度达到146kPa，28d无侧限抗压强度达到338kPa；28d黏聚力c达124kPa，内摩擦角φ为12°～15°；渗透系数随龄期增加逐渐减小，渗透系数基本维持在10-7cm/s数量级。
采用该配比改性市政污泥，力学强度和渗透系数满足填埋场临时覆土材料的要求，后期渗透性保持稳定，强度还在继续增长。
实施例2
改性市政污泥包含以下原料：垃圾焚烧飞灰、水泥以及市政污泥，其中，按质量比计，市政污泥/(垃圾焚烧飞灰+水泥)＝2，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.6。
具体的，以每立方改性市政污泥计，将1340kg市政污泥、402kg垃圾焚烧飞灰、268kg水泥搅拌混合，制得改性市政污泥。
性能测试
根据现有规范《土工试验方法标准》(GB/T50123-2019)进行测试，养护条件为水下养护。
测试结果如图3所示。密度约为2010kg/m3；实测7d无侧限抗压强度达到55kPa，28d无侧限抗压强度达到280kPa；28d黏聚力c达59kPa，内摩擦角φ为25°～27°；渗透系数随龄期增加逐渐减小，渗透系数基本维持在10-7cm/s数量级。
采用该配比改性市政污泥，在雨水条件丰富时表现较好的后期强度，力学强度和渗透系数满足填埋场临时覆土材料的要求，后期渗透性保持稳定，强度还在继续增长。
实施例3
改性市政污泥包含以下原料：垃圾焚烧飞灰、水泥以及市政污泥，其中，按质量比计，市政污泥/(垃圾焚烧飞灰+水泥)＝2，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.8。
具体的，以每立方改性市政污泥计，将1340kg市政污泥、536kg垃圾焚烧飞灰、134kg水泥搅拌混合，制得改性市政污泥。
性能测试
根据现有规范《土工试验方法标准》(GB/T50123-2019)进行测试，养护条件为水下养护。
测试结果如图4所示。密度约为2010kg/m3；实测7d无侧限抗压强度达到56kPa，28d无侧限抗压强度达到86kPa；28d黏聚力c达30kPa，内摩擦角φ为2°～6°；渗透系数随龄期增加逐渐减小，渗透系数基本维持在10-7cm/s数量级。
采用该配比改性市政污泥，后期力学强度和渗透系数满足填埋场临时覆土材料的要 求，后期渗透性保持稳定，强度还在继续增长。
对比例1
改性市政污泥包含以下原料：垃圾焚烧飞灰、水泥以及市政污泥，其中，按质量比计，市政污泥/(垃圾焚烧飞灰+水泥)＝2，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.4。
具体的，以每立方改性市政污泥计，将1334kg市政污泥、267kg垃圾焚烧飞灰、400kg水泥搅拌混合，制得改性市政污泥。
性能测试
根据现有规范《土工试验方法标准》(GB/T50123-2019)进行测试，养护条件为标准养护。
密度约为2000kg/m3；实测7d无侧限抗压强度达到199kPa，28d无侧限抗压强度达到228kPa；28d黏聚力c达106kPa，内摩擦角φ为29°～34°；渗透系数基本维持在10-7cm/s数量级。
采用该方法养护改性市政污泥，前期强度过高，不便于施工，后期强度发展不足。
对比例2
改性市政污泥包含以下原料：垃圾焚烧飞灰、水泥以及市政污泥，其中，按质量比计，市政污泥/(垃圾焚烧飞灰+水泥)＝2，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.6。
具体的，以每立方改性市政污泥计，将1340kg市政污泥、402kg垃圾焚烧飞灰、268kg水泥搅拌混合，制得改性市政污泥。
性能测试
根据现有规范《土工试验方法标准》(GB/T50123-2019)进行测试，养护条件为标准养护。
密度约为2010kg/m3；实测7d无侧限抗压强度达到70kPa，28d无侧限抗压强度达到112kPa；28d黏聚力c达31kPa，内摩擦角φ为3°～4°；渗透系数基本维持在10-7cm/s数量级。
采用该方法养护改性市政污泥，前期强度过高，不便于施工，后期强度发展不足，且剪切强度较低。
对比例3
改性市政污泥包含以下原料：垃圾焚烧飞灰、水泥以及市政污泥，其中，按质量比计，市政污泥/(垃圾焚烧飞灰+水泥)＝2，垃圾焚烧飞灰/(水泥+垃圾焚烧飞灰)＝0.8。
具体的，以每立方改性市政污泥计，将1340kg市政污泥、536kg垃圾焚烧飞灰、134kg水泥搅拌混合，制得改性市政污泥。
性能测试
根据现有规范《土工试验方法标准》(GB/T50123-2019)进行测试，养护条件为标准养护。
密度约为2010kg/m3；实测7d无侧限抗压强度达到26kPa，28d无侧限抗压强度达到50kPa；28d黏聚力c达29kPa，内摩擦角φ为0°～1°；渗透系数基本维持在10-7cm/s数量级。
采用该方法养护改性市政污泥，强度未达到50kPa，无法满足填埋场临时覆土材料要求，且剪切强度较低。
通过以上实施例和对比例可以表明：
该改性市政污泥适合雨水丰富的环境中，因此更适用于潮湿、雨水丰富的填埋场环境。
利用垃圾焚烧飞灰替代部分水泥改性市政污泥，可以节约水泥用量，将垃圾焚烧飞灰资源化，降低成本。
利用垃圾焚烧飞灰的粒径较大且颗粒表面存在大量孔隙的特点，增大市政污泥土体的孔隙，使改性市政污泥的渗透性满足填埋场覆土材料要求。
利用垃圾焚烧飞灰的火山灰性，与水泥共同改性市政污泥，有效增强改性市政污泥的后期强度发展。
利用垃圾焚烧飞灰改性市政污泥，将其作为填埋场覆土材料，减少其余土材料的使用，节约填埋场空间。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种填埋场覆土用改性市政污泥，其特征在于：包括市政污泥、垃圾焚烧飞灰和水泥，市政污泥的质量与垃圾焚烧飞灰和水泥两者的质量和比为1.8-2.2。
  2. 根据权利要求1所述的一种填埋场覆土用改性市政污泥，其特征在于：市政污泥的质量与垃圾焚烧飞灰和水泥两者的质量和比为2。
  3. 根据权利要求1所述的一种填埋场覆土用改性市政污泥，其特征在于：垃圾焚烧飞灰的质量与垃圾焚烧飞灰和水泥的质量和比为0.4-0.8。
  4. 根据权利要求1所述的一种填埋场覆土用改性市政污泥，其特征在于：所述市政污泥的重度为10.3-10.5kN/m3，塑限50％～60％，液限110％～120％，含水率365％，有机质32％。
  5. 根据权利要求1所述的一种填埋场覆土用改性市政污泥，其特征在于：所述水泥为普通硅酸盐P.O42.5水泥，细度为0.08mm。
  6. 根据权利要求1所述的一种填埋场覆土用改性市政污泥，其特征在于：所述垃圾焚烧飞灰为粉末状，粒径0.1-0.5mm。
  7. 一种权利要求1-6中任一项填埋场覆土用改性市政污泥的制备方法，具体步骤为：将市政污泥与垃圾焚烧飞灰和水泥混合搅拌8-12min，然后养护20-28h，即可作为雨水丰富地区填埋场覆土材料使用。
  8. 根据权利要求7所述的一种填埋场覆土用改性市政污泥的制备方法，其特征在于：垃圾焚烧飞灰混合之前研磨至粉末状，过35目筛，使得粒径为0.1-0.5mm。
  9. 根据权利要求8所述的一种填埋场覆土用改性市政污泥的制备方法，其特征在于：垃圾焚烧飞灰在研磨之前在温度为70-75℃的环境中烘烤20-28h。
PCT/CN2022/131837 2022-05-27 2022-11-15 一种填埋场覆土用改性市政污泥及其制备方法 WO2023226321A1 (zh)

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