CN110642484A - A dewatering sludge solidifying agent - Google Patents
A dewatering sludge solidifying agent Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 54
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 44
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 29
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 16
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 16
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 16
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 abstract description 14
- 238000003756 stirring Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000661 sodium alginate Substances 0.000 description 5
- 235000010413 sodium alginate Nutrition 0.000 description 5
- 229940005550 sodium alginate Drugs 0.000 description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 polyethylene Acetate Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
本发明公开了一种脱水污泥固化剂，按重量比例计算，其特征在于，包括：氧化镁55～75％；氯化镁15～35％；聚乙烯乙酸酯5～15％。本发明的有益效果在于：配方简单，使用量小，操作简便，仅需将污泥和固化剂按质量比为1:(0.08～0.15)的比例混合，搅拌均匀后摊铺晾晒；固化污泥性质均一，表面和内部强度相同，表面不开裂，内部不软黏；固化速度快，固化效果好。The invention discloses a dewatered sludge solidifying agent, which is characterized by comprising: 55-75% of magnesium oxide; 15-35% of magnesium chloride; and 5-15% of polyvinyl acetate. The beneficial effects of the invention are as follows: the formula is simple, the usage amount is small, and the operation is simple and convenient, only the sludge and the curing agent need to be mixed in a mass ratio of 1: (0.08-0.15), and then spread evenly after stirring; The properties are uniform, the surface and internal strength are the same, the surface is not cracked, and the interior is not soft and sticky; the curing speed is fast and the curing effect is good.
Description
技术领域technical field
本发明涉及环境工程技术领域，具体涉及一种脱水污泥固化剂。The invention relates to the technical field of environmental engineering, in particular to a dewatered sludge solidifying agent.
背景技术Background technique
污水污泥量大且含水率高，在进行填埋前，需要脱除其水分，增加其强度，以缩小体积并增强稳定性，降低滑坡风险。Sewage sludge has a large volume and high moisture content. Before landfilling, it is necessary to remove its moisture and increase its strength to reduce the volume and enhance the stability to reduce the risk of landslides.
一般处理方式为将含水率98％以上的污泥进行初步脱水后再进行固化处理，而现有固化剂使用量约为污泥量的20％～35％，还极大地增加了污泥处置量，给填埋场带来重大压力。The general treatment method is to preliminarily dehydrate the sludge with a moisture content of more than 98% and then solidify it. The existing curing agent usage is about 20% to 35% of the sludge volume, which greatly increases the sludge disposal volume. , putting significant pressure on landfills.
因此亟需发明一种低用量、低成本且配料简单的污泥固化剂。尤其是针对市政污水厂、渗滤液处理厂经初步脱水后含水率低于85％的脱水污泥。Therefore, there is an urgent need to invent a sludge solidifying agent with low dosage, low cost and simple ingredients. Especially for dewatered sludge with water content below 85% after preliminary dehydration in municipal sewage plants and leachate treatment plants.
另外如中国专利申请CN105254166B当中的固化剂，虽然加入量低，但是存在制备方法复杂，制备过程耗费能源及可能产生水污染问题。In addition, as the curing agent in Chinese patent application CN105254166B, although the added amount is low, the preparation method is complicated, the preparation process consumes energy and may cause water pollution.
发明内容SUMMARY OF THE INVENTION
为了克服现有技术的上述缺陷，本发明研发一种低用量且低成本的脱水污泥固化剂。In order to overcome the above-mentioned defects of the prior art, the present invention develops a low-consumption and low-cost solidifying agent for dewatered sludge.
为了实现本发明的目的，所采用的技术方案是：In order to realize the purpose of the present invention, the technical scheme adopted is:
一种脱水污泥固化剂，按重量比例计算，包括：A dewatered sludge solidifying agent, calculated in proportion by weight, comprising:
氧化镁55～75％；Magnesium oxide 55～75%;
氯化镁15～35％；
聚乙烯乙酸酯5～15％。Polyvinyl acetate 5 to 15%.
在本发明的一个优选实施例中，所述污泥和固化剂按质量比为1:(0.08～0.15)的比例混合。In a preferred embodiment of the present invention, the sludge and the solidifying agent are mixed in a mass ratio of 1:(0.08-0.15).
本发明的有益效果在于：The beneficial effects of the present invention are:
配方简单，使用量小，操作简便，仅需将污泥和固化剂按质量比为1:(0.08～0.15)的比例混合，搅拌均匀后摊铺晾晒；固化污泥性质均一，表面和内部强度相同，表面不开裂，内部不软黏；固化速度快，固化效果好。The formula is simple, the amount of use is small, and the operation is simple. It only needs to mix the sludge and the curing agent in a mass ratio of 1: (0.08 to 0.15), stir evenly, and then spread and dry; the cured sludge has uniform properties, surface and internal strength. The same, the surface is not cracked, the interior is not soft and sticky; the curing speed is fast, and the curing effect is good.
附图说明Description of drawings
图1为80％含水率污泥添加10％固化剂时无侧限抗压强度随时间变化图。Figure 1 shows the change of unconfined compressive strength with time when 80% moisture content sludge is added with 10% curing agent.
图2为聚乙烯乙酸酯固化污泥的效果图。Figure 2 is an effect diagram of polyvinyl acetate solidified sludge.
图3为羧甲基纤维素钠固化污泥的效果图。Figure 3 is an effect diagram of sodium carboxymethyl cellulose solidified sludge.
图4为海藻酸钠固化污泥的效果图。Figure 4 is an effect diagram of sodium alginate solidifying sludge.
图5为实验研究的数据图。Figure 5 is a graph of the data from the experimental study.
具体实施方式Detailed ways
传统的无机固化剂脱水效果好，且价格低廉，但仅使用无机固化剂为达到填埋效果，添加量一般需要达到污泥量的25％以上，极大地增加了填埋污泥的体积，加重了填埋场负担，故采用无机固化剂与有机固化剂结合的方式，确保少量投加即可达到理想效果。The traditional inorganic curing agent has good dewatering effect and low price, but only the inorganic curing agent is used to achieve the landfill effect, and the addition amount generally needs to reach more than 25% of the sludge volume, which greatly increases the volume of the landfill sludge and increases the weight of the sludge. In order to avoid the burden of landfill, the combination of inorganic curing agent and organic curing agent is adopted to ensure that a small amount of addition can achieve the desired effect.
实施例1Example 1
一种脱水污泥固化剂，配方为65％氧化镁，15％氯化镁，15％聚乙烯乙酸酯，取料掺混均匀后，以污泥：固化剂＝1：0.06的比例加入含水率80％脱水污泥中，搅拌均匀后室内放置。A dewatered sludge solidifying agent, the formula is 65% magnesium oxide, 15% magnesium chloride, 15% polyvinyl acetate, after taking the material and mixing it evenly, adding the water content 80% in the ratio of sludge: solidifying agent = 1:0.06 % dewatered sludge, stir evenly and place it indoors.
固化污泥效果为：龄期7天时，固化污泥含水率为63.92％，无侧限抗压强度为81.2KPa。The effect of the solidified sludge is: when the age is 7 days, the water content of the solidified sludge is 63.92%, and the unconfined compressive strength is 81.2KPa.
实施例2Example 2
一种脱水污泥固化剂，配方为55％氧化镁，32％氯化镁，13％聚乙烯乙酸酯，取料掺混均匀后，以污泥：固化剂＝1：0.11的比例加入含水率80％脱水污泥中，搅拌均匀后室内放置。A dewatered sludge solidifying agent, the formula is 55% magnesium oxide, 32% magnesium chloride, 13% polyvinyl acetate, after taking the material and mixing it uniformly, adding the water content 80% in the ratio of sludge: solidifying agent = 1:0.11 % dewatered sludge, stir evenly and place it indoors.
固化污泥效果为：龄期7天时，固化污泥含水率为58.78％，无侧限抗压强度为110.3KPa。The effect of the solidified sludge is: when the age is 7 days, the water content of the solidified sludge is 58.78%, and the unconfined compressive strength is 110.3KPa.
实施例3Example 3
一种脱水污泥固化剂，配方为68％氧化镁，23％氯化镁，9％聚乙烯乙酸酯，取料掺混均匀后，以污泥：固化剂＝1：0.11的比例加入含水率80％脱水污泥中，搅拌均匀后室内放置。A dewatered sludge solidifying agent, the formula is 68% magnesium oxide, 23% magnesium chloride, 9% polyvinyl acetate, after taking the material and mixing it evenly, adding the water content 80% in the ratio of sludge: solidifying agent = 1:0.11 % dewatered sludge, stir evenly and place it indoors.
固化污泥效果为：龄期7天时，固化污泥含水率为59.32％，无侧限抗压强度为104.2KPa。The effect of the solidified sludge is: when the age is 7 days, the water content of the solidified sludge is 59.32%, and the unconfined compressive strength is 104.2KPa.
与CN201710998984.0相比，其公开了一种污泥固化剂使用高铝水泥、硅酸盐水泥、二水石膏三种组分混合而成，可以达到填埋要求，但需要以20％至30％的重量配比添加。而与现有技术相比，本发明配方简单，材料均可直接购置，无需加工，方便快捷。Compared with CN201710998984.0, it discloses a sludge solidifying agent which is prepared by mixing three components of high alumina cement, Portland cement and dihydrate gypsum, which can meet the requirements of landfill, but needs to be 20% to 30%. % of the weight ratio is added. Compared with the prior art, the present invention has simple formula, all materials can be directly purchased, no processing is required, and it is convenient and quick.
本发明的开发原理在于:The development principle of the present invention is:
经过初步筛选后采用海藻酸钠、聚乙烯乙酸酯、羧甲基纤维素钠三种有机固化剂结合氧化镁氯化镁无机固化剂进行了固化试验，发现无侧限抗压强度结果为：聚乙烯乙酸酯＞海藻酸钠＞羧甲基纤维素钠；含水率为羧甲基纤维素钠＞海藻酸钠＞聚乙烯乙酸酯；且添加聚乙烯乙酸酯的固化污泥内外均一，而添加海藻酸钠的固化污泥表面布满裂缝，添加羧甲基纤维素钠的固化污泥布满裂缝且外壳坚硬内里黏软。因此确定聚乙烯乙酸酯是优选的有机固化剂配方。After preliminary screening, three organic curing agents, sodium alginate, polyvinyl acetate, and sodium carboxymethyl cellulose, combined with magnesium oxide and magnesium chloride inorganic curing agents were used to carry out curing tests. It was found that the unconfined compressive strength results were: polyethylene Acetate > sodium alginate > sodium carboxymethyl cellulose; the water content is sodium carboxymethyl cellulose > sodium alginate > polyvinyl acetate; and the solidified sludge added with polyvinyl acetate is uniform inside and outside, while The surface of the solidified sludge added with sodium alginate is covered with cracks, and the solidified sludge with sodium carboxymethyl cellulose is covered with cracks and the outer shell is hard and the inner is soft. Therefore, polyvinyl acetate was determined to be the preferred organic curing agent formulation.
有机固化剂添加量不变(1％)，改变无机固化剂的添加量，对于含水率为80％的污泥：The amount of organic curing agent added is unchanged (1%), and the amount of inorganic curing agent added is changed. For sludge with a moisture content of 80%:
当添加3％(以原污泥湿重为100％)无机固化剂时，静置7d含水率为68.938％；When adding 3% (the original sludge wet weight is 100%) inorganic curing agent, the moisture content of standing for 7d is 68.938%;
当添加5％无机固化剂时静置7d含水率为66.490；When adding 5% inorganic curing agent, the moisture content is 66.490 after standing for 7 days;
当添加10％无机固化剂时，静置7d含水率为61.212％，且无侧限抗压强度也会明显随添加量增加而增强。When 10% inorganic curing agent is added, the moisture content of standing for 7 days is 61.212%, and the unconfined compressive strength also increases obviously with the increase of the addition amount.
因此对于80％含水率的污泥，添加10％左右的无机固化剂可以使它在7d内满足填埋要求，若污泥初始含水率较高或要加速含水率的降低，可酌情增加固化剂用量，反之可以减少用量；但若添加量过高，会增加污泥和固化剂的搅拌难度，不利于混合均匀。Therefore, for sludge with a moisture content of 80%, adding about 10% inorganic curing agent can make it meet the landfill requirements within 7 days. If the initial moisture content of the sludge is high or the reduction of the moisture content is to be accelerated, the curing agent can be added as appropriate. However, if the amount added is too high, it will increase the difficulty of mixing sludge and curing agent, which is not conducive to uniform mixing.
无机固化剂添加量不变(10％)，改变聚乙烯乙酸酯有机固化剂成分的用量，当添加0.5％时，静置7d含水率为65.503％；当添加1％时，静置7d含水率为65.695％；当添加1.5％时，静置7d含水率65.442，无侧限抗压强度随添加量的增加而增加，但变化幅度和含水率一样不太明显。因此，从降低成本的角度，可选择聚乙烯乙酸酯添加量在较小水平。The amount of inorganic curing agent added is unchanged (10%), and the amount of organic curing agent components of polyvinyl acetate is changed. When adding 0.5%, the moisture content of standing for 7 days is 65.503%; when adding 1%, standing for 7 days contains water When adding 1.5%, the water content is 65.442 after standing for 7 days, and the unconfined compressive strength increases with the increase of the addition amount, but the change is not as obvious as the water content. Therefore, from the perspective of cost reduction, the addition amount of polyvinyl acetate can be selected at a small level.
且发明内容中的5～15％是相对于固化剂100％说的，即聚乙烯乙酸酯在总成份中占5～15％；而此处的使用量是相对于湿污泥的量说的，聚乙烯乙酸酯添加量为湿污泥量的0.5％/1％/1.5％。And the 5-15% in the content of the invention is relative to 100% of the curing agent, that is, polyvinyl acetate accounts for 5-15% in the total composition; and the amount used here is relative to the amount of wet sludge. Yes, the amount of polyvinyl acetate added is 0.5%/1%/1.5% of the amount of wet sludge.
氯氧镁水泥是一种由轻烧氧化镁(MgO)、氯化镁(MgCl2)、水(H2O)按照一定比例形成的气硬性胶凝材料，具有快硬特性，因此采用氧化镁和氯化镁作为固化剂，可与污泥中的水分反应形成结晶相，从而可使污泥达到固化效果；Magnesium oxychloride cement is an air-hardening cementitious material formed by light-burned magnesium oxide (MgO), magnesium chloride (MgCl 2 ), and water (H 2 O) in a certain proportion. It has fast hardening properties. Therefore, magnesium oxide and magnesium chloride are used. As a curing agent, it can react with the moisture in the sludge to form a crystalline phase, so that the sludge can achieve a curing effect;
1.实验研究发现当氧化镁和氯化镁的摩尔比为8.76～10.3时，可以达到良好的力学效果(如图5所示)。1. The experimental study found that when the molar ratio of magnesium oxide and magnesium chloride is 8.76 to 10.3, a good mechanical effect can be achieved (as shown in Figure 5).
2.无机固化剂总量保持不变，改变氧化镁和氯化镁的摩尔比，其无侧限抗压强度如图5，当摩尔比为4/1和10/1时力学强度较高。选取4/1、7/1、10/1进行进一步实验，实验结果为：氧化镁/氯化镁＝4/1时，无侧限抗压强度为14.931；氧化镁/氯化镁＝7/1时，无侧限抗压强度为13.792；氧化镁/氯化镁＝10/1时，无侧限抗压强度为15.182，因此当氧化镁/氯化镁的摩尔比为10/1左右时，固化污泥的力学强度最佳。2. The total amount of inorganic curing agent remains unchanged, and the molar ratio of magnesium oxide and magnesium chloride is changed. The unconfined compressive strength is shown in Figure 5. When the molar ratio is 4/1 and 10/1, the mechanical strength is higher. Select 4/1, 7/1 and 10/1 for further experiments. The experimental results are: when magnesium oxide/magnesium chloride=4/1, the unconfined compressive strength is 14.931; when magnesium oxide/magnesium chloride=7/1, there is no The confining compressive strength is 13.792; when magnesium oxide/magnesium chloride=10/1, the unconfined compressive strength is 15.182, so when the molar ratio of magnesium oxide/magnesium chloride is about 10/1, the mechanical strength of the solidified sludge is the highest. good.
聚乙烯乙酸酯可用来制备胶粘剂，也可作为水质混凝剂，因此将其作为有机固化剂加入污泥中，可以起到增大粘度、吸附架桥的效果，有利于无机固化剂和污泥的结合，从而加强固化效果。Polyvinyl acetate can be used to prepare adhesives and water coagulants. Therefore, adding it as an organic solidifying agent to sludge can increase the viscosity and absorb bridging, which is beneficial to inorganic solidifying agents and sewage. The combination of mud, thereby enhancing the curing effect.
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| CN1220980A (en) * | 1991-01-29 | 1999-06-30 | C·F·沙夫 | concrete products |
| CN101260230A (en) * | 2007-03-07 | 2008-09-10 | 许培圣 | Hot-pressing forming artificial stone material and preparation method thereof |
| CN102503328A (en) * | 2011-09-30 | 2012-06-20 | 北京旷世达资源环境工程发展中心 | Universal rock and soil curing agent and preparation method thereof |
| CN105314817A (en) * | 2014-08-01 | 2016-02-10 | 蒋华 | Treatment method for dewatered sludge of domestic sewage treatment plant |
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2019
- 2019-09-11 CN CN201910859095.5A patent/CN110642484A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1220980A (en) * | 1991-01-29 | 1999-06-30 | C·F·沙夫 | concrete products |
| CN101260230A (en) * | 2007-03-07 | 2008-09-10 | 许培圣 | Hot-pressing forming artificial stone material and preparation method thereof |
| CN102503328A (en) * | 2011-09-30 | 2012-06-20 | 北京旷世达资源环境工程发展中心 | Universal rock and soil curing agent and preparation method thereof |
| CN105314817A (en) * | 2014-08-01 | 2016-02-10 | 蒋华 | Treatment method for dewatered sludge of domestic sewage treatment plant |
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