CN104944736B - A kind of curing integrated processing method of sludge dewatering - Google Patents
A kind of curing integrated processing method of sludge dewatering Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 70
- 238000003672 processing method Methods 0.000 title 1
- 230000018044 dehydration Effects 0.000 claims abstract description 31
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 29
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000007711 solidification Methods 0.000 claims abstract description 20
- 230000008023 solidification Effects 0.000 claims abstract description 20
- 239000010865 sewage Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 13
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 11
- 239000000292 calcium oxide Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000012024 dehydrating agents Substances 0.000 claims abstract description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 8
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 8
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 8
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 8
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 8
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 3
- 150000002505 iron Chemical class 0.000 claims description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 208000005156 Dehydration Diseases 0.000 description 19
- 239000000463 material Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000008570 general process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
本发明公开了一种污泥脱水固化一体化处理方法。通过将待处理的污水厂浓缩池的污泥加入混合反应器中，然后向其中加入脱水药剂、固化药剂，经搅拌反应后，进行机械脱水，得到脱水固化的污泥；其中，脱水药剂为铁盐或铝盐絮凝剂，固化药剂为生石灰、高炉炉渣灰和缓凝剂的组合物。高含水率污泥经本方法处理后，污泥的含水率降至44％以下，无侧限抗压强度可达到大于520kPa，抗剪强度可达到大于50kN/m2，可满足填埋场覆盖土或一般回填土的土工强度要求。本方法具有工艺流程简单、脱水率高、固化效果好、耗能低等优点，具有较高的推广应用价值。
The invention discloses an integrated treatment method for sludge dehydration and solidification. By adding the sludge from the concentration tank of the sewage plant to be treated into the mixing reactor, and then adding dehydrating agents and curing agents to it, after stirring and reacting, mechanical dehydration is carried out to obtain dehydrated and solidified sludge; wherein, the dehydrating agent is iron Salt or aluminum salt flocculant, the curing agent is the combination of quicklime, blast furnace slag and retarder. After the sludge with high water content is treated by this method, the water content of the sludge is reduced to below 44%, the unconfined compressive strength can reach more than 520kPa, and the shear strength can reach more than 50kN/m 2 , which can meet the requirements of landfill coverage Geotechnical strength requirements of soil or general backfill. The method has the advantages of simple technological process, high dehydration rate, good curing effect, low energy consumption, etc., and has high popularization and application value.
Description
技术领域technical field
本发明属于污泥处理技术领域，具体涉及一种污泥脱水固化一体化处理方法。The invention belongs to the technical field of sludge treatment, and in particular relates to an integrated treatment method for sludge dehydration and solidification.
背景技术Background technique
城市污水生物处理过程产生大量污泥，污泥含水率高、有机质含量高、强度低。污泥经处理后作为填埋场覆盖土或一般回填土利用，是污泥资源化的一种重要途径。污泥用作填埋场覆盖土或回填土材料，须经过脱水、固化处理以提高其土工力学强度。污泥机械脱水是以提高脱水率为目标的，一般工艺是加絮凝剂和助凝剂调理改性后，用压滤机或离心机脱水，目前已有大量应用实践，但由于污泥有机质含量高，即使有较高的污泥脱水率，其土工强度通常很难达到填埋场覆盖土或一般回填土的土工强度要求。污泥固化是以提高污泥土工强度为目标的一种处理技术，一般工艺是在脱水污泥中掺固化材料，使污泥、水、固化材料之间发生化学作用，使松软污泥变成具有一定工程强度的土材料。污泥脱水处理、固化处理通常分二步完成，这种方法的缺点是工艺流程长，固体状的脱水污泥与固化材料的混合过程需要专门的固相混合设备、耗能大，人工拌合劳动强度也很大。The biological treatment process of urban sewage produces a large amount of sludge, which has high moisture content, high organic matter content and low strength. After the sludge is treated, it can be used as landfill cover soil or general backfill soil, which is an important way of sludge resource utilization. Sludge is used as landfill cover soil or backfill material, and it must be dehydrated and solidified to improve its geomechanical strength. Sludge mechanical dehydration is aimed at increasing the dehydration rate. The general process is to add flocculants and coagulant aids to condition and modify, and then use a filter press or centrifuge to dehydrate. At present, there have been a lot of application practices, but due to the organic matter content of sludge Even if there is a high sludge dewatering rate, its geotechnical strength is usually difficult to meet the geotechnical strength requirements of landfill cover soil or general backfill soil. Sludge solidification is a treatment technology aimed at improving the geotechnical strength of sludge. The general process is to mix solidified materials in dewatered sludge to make a chemical interaction between sludge, water and solidified materials, so that soft sludge becomes Soil material with certain engineering strength. Sludge dehydration treatment and solidification treatment are usually completed in two steps. The disadvantage of this method is that the process flow is long, and the mixing process of solid dewatered sludge and solidified materials requires special solid-phase mixing equipment, which consumes a lot of energy and requires manual mixing. Labor intensity is also great.
发明内容Contents of the invention
本发明的目的是提供一种工艺流程简单、脱水率高、固化效果好、脱水固化后的污泥土工力学强度高、耗能低的污泥脱水固化一体化处理方法。The purpose of the present invention is to provide an integrated treatment method for sludge dehydration and solidification with simple process flow, high dehydration rate, good solidification effect, high geomechanics strength of dehydrated and solidified sludge, and low energy consumption.
本发明的污泥脱水固化一体化处理方法，其特征在于，包括以下步骤：将待处理的污水厂浓缩池的污泥加入混合反应器中，然后向混合反应器中加入脱水药剂和固化药剂，经搅拌反应后，进行机械脱水，得到脱水固化的污泥；The sludge dehydration and solidification integrated treatment method of the present invention is characterized in that it includes the following steps: adding the sludge from the concentration tank of the sewage plant to be treated into the mixing reactor, and then adding the dehydrating agent and the curing agent into the mixing reactor, After stirring and reacting, mechanical dehydration is carried out to obtain dehydrated and solidified sludge;
所述的脱水药剂为铁盐或铝盐絮凝剂，其添加量为20～50mg/kg污泥；The dehydrating agent is an iron salt or aluminum salt flocculant, and its addition amount is 20-50 mg/kg sludge;
所述的固化药剂为生石灰、高炉炉渣灰和缓凝剂的混合物，其按质量分数100％计，包括生石灰33～66.97％、高炉炉渣灰33～66.94％和缓凝剂0.03～0.06％，其中缓凝剂，按总质量分数100％计，包括焦磷酸纳40～60％和三聚磷酸钠40～60％，所述的固化药剂的添加量为500～1000mg/kg污泥。The curing agent is a mixture of quicklime, blast furnace slag and retarder, which includes 33-66.97% of quicklime, 33-66.94% of blast furnace slag and 0.03-0.06% of retarder based on 100% mass fraction, wherein the retarder The curing agent includes 40-60% of sodium pyrophosphate and 40-60% of sodium tripolyphosphate based on the total mass fraction of 100%, and the addition amount of the curing agent is 500-1000mg/kg sludge.
所述的铁盐优选为聚合硫酸铁和/或硫酸铁，所述的铝盐絮凝剂优选为聚合氯化铝和/或三氯化铝。The iron salt is preferably polyferric sulfate and/or ferric sulfate, and the aluminum salt flocculant is preferably polyaluminum chloride and/or aluminum trichloride.
所述的搅拌(混合)反应时间优选为10～15分钟。The stirring (mixing) reaction time is preferably 10-15 minutes.
所述的机械脱水优选采用板框压滤机进行脱水，压力1.0～1.2M Pa，压滤90分钟。The mechanical dehydration is preferably carried out by using a plate and frame filter press for 90 minutes at a pressure of 1.0-1.2 MPa.
所述的高炉炉渣灰为钢铁厂冶炼生铁时从高炉中排出的废弃物。The blast furnace slag ash is the waste discharged from the blast furnace when the steel plant smelts pig iron.
本发明具有以下优点：(1)本发明针对城市污水生物处理过程产生大量污泥，其污泥含水率高、有机质含量高和强度低的特点，通过优选脱水药剂和固化药剂，添加合适的量，同时添加到污泥中，不但将污泥脱水、固化过程结合起来，与通常的污泥先脱水、后固化的二步法工艺相比，实现操作流程便利化，而且经过本发明的方法处理后的污泥，污泥的含水率降至44％以下，无侧限抗压强度可达到大于520kPa，抗剪强度可达到大于50kN/m2，可满足填埋场覆盖土或一般回填土的土工强度要求，克服了传统机械脱水工艺脱水率低、污泥土工力学强度低的缺点；(2)在固化材料方面，本发明利用了钢厂高炉炉渣灰的类水泥性质，代替水泥作为固化材料的主要成分，实现了废物再利用。The present invention has the following advantages: (1) The present invention aims at producing a large amount of sludge in the biological treatment process of urban sewage, and the sludge has the characteristics of high moisture content, high organic matter content and low strength. , and added to the sludge at the same time, it not only combines the sludge dehydration and solidification process, but also realizes the convenience of the operation process compared with the usual two-step process of sludge dehydration first and then solidification, and the process of the present invention After the sludge, the moisture content of the sludge is reduced to below 44%, the unconfined compressive strength can reach more than 520kPa, and the shear strength can reach more than 50kN/m 2 , which can meet the requirements of landfill cover soil or general backfill soil. Geotechnical strength requirements overcome the shortcomings of low dehydration rate and low sludge geomechanical strength of traditional mechanical dehydration process; (2) In terms of solidification materials, the present invention utilizes the cement-like properties of steel mill blast furnace slag ash to replace cement as solidification material The main component realizes the reuse of waste.
附图说明Description of drawings
图1是本发明的污泥脱水固化一体化处理方法的流程示意图。Fig. 1 is a schematic flow chart of the sludge dehydration and solidification integrated treatment method of the present invention.
具体实施方式detailed description
以下是对本发明的进一步说明，而不是对本发明的限制。The following is a further description of the present invention, rather than a limitation of the present invention.
本发明的污泥脱水固化一体化处理方法工艺流程如图1所示。其工艺流程是以污水厂浓缩池的高含水率污泥为起点，在混合反应器中分别加入脱水药剂和固化药剂，搅拌反应，然后利用机械脱水装置脱水。在以上流程中通过絮凝、水解、凝结等多重物理化学作用，实现污泥脱水固化一体化处理，以同时达到提高脱水率、增加污泥土工力学强度的目标，经脱水固化处理的污泥用于一般回填土或填埋场覆盖土；排水回流至污水处理系统进水端。The process flow of the sludge dehydration and solidification integrated treatment method of the present invention is shown in Fig. 1 . The process is based on the sludge with high water content in the concentration tank of the sewage plant, adding dehydrating agent and solidifying agent respectively into the mixing reactor, stirring and reacting, and then dehydrating by mechanical dehydration device. In the above process, through multiple physical and chemical effects such as flocculation, hydrolysis, and coagulation, the integrated treatment of sludge dehydration and solidification is realized, so as to achieve the goal of increasing the dehydration rate and increasing the geomechanics strength of the sludge at the same time. The sludge after dehydration and solidification is used for General backfill soil or landfill cover soil; drainage returns to the water inlet of the sewage treatment system.
下列实施例将进一步说明本发明。The following examples further illustrate the invention.
实施例1Example 1
广州某城市污水厂的含水率98％的污水厂浓缩池污泥1000kg，泵入1.5立方的搅拌混合反应器，同时在搅拌混合反应器中分别按比例加入脱水药剂和固化药剂，经过10分钟搅拌反应，泵入板框压滤机，压力1.0M Pa，压滤90分钟，经压滤以后，获得经脱水固化处理的污泥，排水回流至污水处理系统进水端。其中，脱水药剂选用聚合硫酸铁，添加量为20mg/kg污泥。固化药剂为生石灰、高炉炉渣灰、缓凝剂的混合物，其配比(重量比)为：生石灰33％、高炉炉渣灰66.94％和缓凝剂0.06％，将三者混合均匀得到固化药剂；其中缓凝剂为焦磷酸纳和三聚磷酸钠的混合物，其配比(重量比)为：焦磷酸纳40％和三聚磷酸钠60％，将两者混合均匀得到缓凝剂，固化药剂的添加量为1000mg/kg污泥。1,000kg of sludge from the thickening tank of a sewage plant with a moisture content of 98% in a city sewage plant in Guangzhou was pumped into a 1.5 cubic mixing reactor. At the same time, dehydrating agents and curing agents were added in proportion to the mixing reactor, and stirred for 10 minutes. Reaction, pumped into a plate and frame filter press, pressure 1.0MPa, press filter for 90 minutes, after press filter, obtain dehydrated and solidified sludge, drain back to the water inlet of the sewage treatment system. Among them, the dehydration agent is polyferric sulfate, and the addition amount is 20mg/kg sludge. The curing agent is a mixture of quicklime, blast furnace slag and retarder, and its proportioning (weight ratio) is: 33% of quicklime, 66.94% of blast furnace slag and 0.06% of retarder, and the three are mixed uniformly to obtain the curing agent; The coagulant is a mixture of sodium pyrophosphate and sodium tripolyphosphate, and its proportioning ratio (weight ratio) is: sodium pyrophosphate 40% and sodium tripolyphosphate 60%, and the two are mixed evenly to obtain a retarder, and the addition of the curing agent The amount is 1000mg/kg sludge.
经测定，污泥经处理以后所得的经脱水固化处理的污泥的含水率降至35％。按照土工试验标准制样、检测，无侧限抗压强度达到590kPa，剪切强度达到66kN/m2，可满足填埋场覆盖土或一般回填土的土工强度要求。It has been determined that the water content of the dehydrated and solidified sludge obtained after the sludge treatment is reduced to 35%. According to the geotechnical test standard sample preparation and testing, the unconfined compressive strength reaches 590kPa, and the shear strength reaches 66kN/m 2 , which can meet the geotechnical strength requirements of landfill cover soil or general backfill soil.
实施例2Example 2
佛山某城市污水厂含水率97％的污水厂浓缩池污泥1000kg，泵入搅拌混合反应器，同时在搅拌混合反应器中分别按比例加入脱水药剂和固化药剂，经过15分钟搅拌反应，泵入板框压滤机，压力1.1M Pa，压滤90分钟，经压滤以后，获得经脱水固化处理的污泥，排水回流至污水处理系统进水端。其中，脱水药剂选用聚合氯化铝，添加量为50mg/kg污泥。固化药剂为生石灰、高炉炉渣灰和缓凝剂的混合物；其配比(重量比)为：生石灰66.97％、高炉炉渣灰33％和缓凝剂0.03％，将三者混合均匀得到固化药剂；其中缓凝剂为焦磷酸纳和三聚磷酸钠的混合物，其配比(重量比)为：焦磷酸纳60％和三聚磷酸钠40％，将两者混合均匀得到缓凝剂；固化药剂的添加量为500mg/kg污泥。1,000kg of sludge from the thickening tank of a sewage plant with a water content of 97% in a city sewage plant in Foshan was pumped into the stirring mixing reactor, and at the same time, the dehydrating agent and curing agent were added in proportion to the stirring mixing reactor. Plate and frame filter press, pressure 1.1MPa, filter press for 90 minutes, after press filter, obtain dehydrated and solidified sludge, drain back to the water inlet of the sewage treatment system. Among them, polyaluminum chloride is selected as the dehydrating agent, and the addition amount is 50mg/kg sludge. The curing agent is a mixture of quicklime, blast furnace slag and retarder; its proportioning (weight ratio) is: quicklime 66.97%, blast furnace slag 33% and retarder 0.03%, and the three are mixed evenly to obtain the curing agent; The agent is a mixture of sodium pyrophosphate and sodium tripolyphosphate, and its proportioning ratio (weight ratio) is: sodium pyrophosphate 60% and sodium tripolyphosphate 40%, and the two are mixed evenly to obtain a retarder; the addition amount of the curing agent It is 500mg/kg sludge.
经测定，污泥经处理以后所得的经脱水固化处理的污泥的含水率降至43％。按照土工试验标准制样、检测，无侧限抗压强度达到520kPa，剪切强度达到50kN/m2，可满足填埋场覆盖土或一般回填土的土工强度要求。It is determined that the water content of the dehydrated and solidified sludge obtained after the sludge is treated drops to 43%. According to the geotechnical test standard sample preparation and testing, the unconfined compressive strength reaches 520kPa, and the shear strength reaches 50kN/m 2 , which can meet the geotechnical strength requirements of landfill cover soil or general backfill soil.
实施例3Example 3
佛山某印染废水处理站含水率97％的浓缩池污泥1000kg，泵入搅拌混合反应器，同时在搅拌混合反应器中分别按比例加入脱水药剂和固化药剂，经过10分钟搅拌反应，泵入板框压滤机，压力1.2M Pa，压滤90分钟，经压滤以后，获得经脱水固化处理的污泥，排水回流至污水处理系统进水端。其中，脱水药剂选用三氯化铝，添加量为40mg/kg污泥。固化药剂为生石灰、高炉炉渣灰和缓凝剂的混合物；其配比(重量比)为：生石灰50％、高炉炉渣灰49.97％和缓凝剂0.03％，将三者混合均匀得到固化药剂；其中缓凝剂为焦磷酸纳和三聚磷酸钠的混合物，其配比(重量比)为：焦磷酸纳60％和三聚磷酸钠40％，将两者混合均匀得到缓凝剂；固化药剂的添加量为1000mg/kg污泥。1,000kg of concentrated pool sludge with a water content of 97% in a printing and dyeing wastewater treatment station in Foshan was pumped into the stirring mixing reactor, and at the same time, dehydrating agents and curing agents were added in proportion to the stirring mixing reactor, and after 10 minutes of stirring reaction, pumped into the plate Frame filter press, pressure 1.2MPa, press filter for 90 minutes, after press filter, obtain dehydrated and solidified sludge, drain back to the water inlet end of the sewage treatment system. Among them, aluminum trichloride is selected as the dehydrating agent, and the addition amount is 40mg/kg sludge. The curing agent is a mixture of quicklime, blast furnace slag and retarder; its proportion (weight ratio) is: quicklime 50%, blast furnace slag 49.97% and retarder 0.03%, and the three are mixed evenly to obtain the curing agent; The agent is a mixture of sodium pyrophosphate and sodium tripolyphosphate, and its proportioning ratio (weight ratio) is: sodium pyrophosphate 60% and sodium tripolyphosphate 40%, and the two are mixed evenly to obtain a retarder; the addition amount of the curing agent It is 1000mg/kg sludge.
经测定，污泥经处理以后所得的经脱水固化处理的污泥的含水率降至44％。按照土工试验标准制样、检测，无侧限抗压强度达到538kPa，剪切强度达到59kN/m2，可满足填埋场覆盖土或一般回填土的土工强度要求。It is determined that the water content of the dehydrated and solidified sludge obtained after the sludge is treated drops to 44%. According to the geotechnical test standard sample preparation and testing, the unconfined compressive strength reaches 538kPa, and the shear strength reaches 59kN/m 2 , which can meet the geotechnical strength requirements of landfill cover soil or general backfill soil.
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