CN102897992B - Method for solidifying and stabilizing sludge from urban sewage treatment plant - Google Patents
Method for solidifying and stabilizing sludge from urban sewage treatment plant Download PDFInfo
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- CN102897992B CN102897992B CN201210398187.6A CN201210398187A CN102897992B CN 102897992 B CN102897992 B CN 102897992B CN 201210398187 A CN201210398187 A CN 201210398187A CN 102897992 B CN102897992 B CN 102897992B
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Abstract
The invention relates to a method for solidifying and stabilizing sludge from an urban sewage treatment plant, belonging to the technical field of environmental engineering. The method comprises the following steps: under room temperature conditions, evenly mixing industrial residue and silicate cement according to a certain ratio; and adding the mixture used as sludge solidifying and stabilizing agent and sludge into a stirrer, evenly stirring, and then curing for 3-7 days to ensure that the water content and strength of the sludge meet the requirements of soil for landfill and construction. According to the invention, the industrial residue is used for solidifying the sludge, and the unique advantage of the industrial residue is fully utilized, so that the solidified sludge can achieve better technical indices, the treatment of wastes with processes of wastes against one another is achieved, and the pollution problem and treatment cost caused by the industrial residue and sludge are greatly reduced, thereby realizing the recycling of wastes.
Description
Technical field
The present invention relates to a kind of solidification and stabilization method of mud, be specially adapted to innoxious, the recycling treatment of sludge from wastewater treatment plant, mud physico-chemical property after processing is greatly improved, can be used for security landfill or, as landfill yard casingmaterial and soil for building, belong to field of environment engineering technology.
Background technology
In recent years, along with the fast development of the sewage disposal industry of China, sewage treatment capacity and processing rate rapid development, the output of mud also increases sharply simultaneously.By in by the end of September, 2011, national town sewage treatment capacity reaches 1.36 billion cubic meters/sky, and wet mud (water ratio 80%) year generation is broken through 3,480 ten thousand tons.According to incompletely statistics, the mud that wastewater treatment in China factory produces, only have small portion to carry out sanitary landfill, soil utilization, burning and building materials utilization etc., and major part is not carried out normalized processing disposal, mud is arbitrarily stacked the pollution that causes and is become increasingly conspicuous with pollution problem again, has caused the concern of various circles of society.
The municipal sludge water ratio is high, bulky, complicated component, be difficult for processing, and contain the hard-degraded substances such as a large amount of organic substances, poisonous and hazardous heavy metal, pathogenic micro-organism, parasitic ovum, salt and radionuclide, there is easily smelly, perishable character.If do not dealt carefully with, can bring serious secondary pollution to surrounding enviroment.The processing disposal options of mud mainly contains sanitary landfill, burning disposal, compost treatment and soil utilization etc. at present.Burning disposal is treatment process more thoroughly, and its product is inorganic residues aseptic, odorless, but can produce the dusty gas such as sulfurous gas, dioxin in burning process, and the one-time investment of sludge incineration and processing cost are all higher than general method for sludge treatment; Compost treatment generally need to be used site than junior college, and needs higher transportation and processing costs, and in China's land resources, under relatively deficient condition, the dung yard development difficulty is large, also is unfavorable for Sustainable development; Sanitary landfill and soil utilization are more traditional Sludge Disposal Techniques, but this owing to after the high water suction of the water ratio of mud own, being the flow-like material, in low bearing capacity and mud, hazardous and noxious substances can be passed through rainwater etch and osmosis polluted underground water, there is no final environmental contamination reduction; Therefore, mud being cured after stabilization treatment as the utilization of resources, is the effective means that solves a difficult problem in the sludge disposal process.
The solidification and stabilization lignin-sludge is by adding solidifying agent, and mud granule is cementing, and fills the mud mesoporosity, makes structure closely knit, reduces moisture percentage in sewage sludge simultaneously, improves its mechanical property, fixedly the hazardous contaminants such as heavy metal in mud.
At present, generally adopt cement, lime, flyash etc. as solidifying agent both at home and abroad, research shows that these solidifying agent can improve its mechanical property to a certain extent, reduce water ratio, reach landfill or native standard for building, but cement, lime incorporation are large, have not only greatly increased the sludge disposal volume, have also increased cost of disposal.The present invention considers in industrial production can produce a large amount of industrial residues, the unique advantage had according to these industrial residues, the solidification and stabilization that is applied to mud is processed, the defect existed in the time of not only can making up cement as solidifying agent, and by waste residue resource, greatly reduce the processing cost of mud and industrial residue, there are market outlook preferably.
Summary of the invention
The solidification and stabilization treatment process that the purpose of this invention is to provide a kind of sludge from wastewater treatment plant, add a certain proportion of curing stablizer in mud, reduce moisture percentage in sewage sludge, improve its mechanical property, fixing hazardous contaminant matter such as heavy metal in mud, realize security landfill or the recycling of sludge from wastewater treatment plant.
The solidification and stabilization treatment process of a kind of sludge from wastewater treatment plant provided by the present invention, it is characterized in that, at ambient temperature, industrial residue, silicate cement are mixed according to a certain percentage, as sludge curing stablizer and the evenly rear maintenance 3-7 days of sludge agitation, make the water ratio of mud and intensity reach landfill and native requirement for building.
Solidify the 5%-10% that stablizer accounts for the mud gross weight in the present invention; Described each components by weight of curing stablizer is: industrial residue: 45-65%, and silicate cement 35-55%, wherein, the consisting of of industrial residue: flyash 10-15%, coal gangue 20-30%, slag 20-30%, phosphogypsum 30-40%, unslaked lime 5-10%.
In the present invention, flyash, coal gangue, slag mainly produce the gelling hydrate, cementing mud granule, and phosphogypsum can produce hydrate, fills the mud granule mesoporosity, makes structure closely knit; Silicate cement is ordinary Portland cement, and silicate cement reacts with water in mud, and heating, can reduce moisture percentage in sewage sludge; Unslaked lime can be removed the foul smell of mud at short notice.
The invention has the advantages that the solidifying for mud by industrial residue, take full advantage of the unique advantage of industrial residue, after making to solidify, mud reaches technical indicator preferably within a short period of time, and the treatment of wastes with processes of wastes against one another, decrease industrial residue and mud bring pollution problem and processing cost, realized the recycling treatment of refuse.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
1) preparation of industrial residue mixture: flyash, coal gangue, slag, phosphogypsum, unslaked lime are mixed even, each components by weight is as follows:
2) solidify the preparation of stablizer: industrial residue mixture, silicate cement are mixed to each components by weight as follows:
Industrial residue 45%,
Silicate cement 55%;
3) mud and curing stablizer are sent in stirrer with worm conveyor respectively, wherein solidified stablizer and account for 5% of mud gross weight, after it is fully mixed to 10-15 minute, with pump, solidification sludge is got to curing field;
4) will solidify rear mud in the curing field maintenance after 7 days, the solidification sludge water ratio is 55.2%, and lower than 60%, unconfined compression strength is 217.8Kpa, and in leach liquor, each heavy metal substance concentration all is less than relevant criterion, therefore can reach security landfill requirement or native requirement for building.
Embodiment 2
1) preparation of industrial residue mixture: flyash, coal gangue, slag, phosphogypsum, unslaked lime are mixed even, each components by weight is as follows:
2) solidify the preparation of stablizer: industrial residue mixture, silicate cement are mixed to each components by weight as follows:
Industrial residue 50%,
Silicate cement 50%;
3) mud and curing stablizer are sent in stirrer with worm conveyor respectively, wherein solidified stablizer and account for 8% of mud gross weight, after will fully mixing 10-15 minute, with pump, solidification sludge is got to curing field;
4) will solidify rear mud in the curing field maintenance after 7 days, the solidification sludge water ratio is 46.8%, and lower than 60%, unconfined compression strength is 332.5Kpa, and in leach liquor, each heavy metal substance concentration all is less than relevant criterion, therefore can reach security landfill requirement or native requirement for building.
Embodiment 3
1) preparation of industrial residue mixture: flyash, coal gangue, slag, phosphogypsum, unslaked lime are mixed even, each components by weight is as follows:
2) solidify the preparation of stablizer: industrial residue mixture, silicate cement are mixed to each components by weight as follows:
Industrial residue 55%,
Silicate cement 45%;
3) mud and curing stablizer are sent in stirrer with worm conveyor respectively, wherein solidified stablizer and account for 10% of mud gross weight, after will fully mixing 10-15 minute, with pump, solidification sludge is got to curing field;
4) will solidify rear mud in the curing field maintenance after 7 days, the solidification sludge water ratio is 45.7%, and lower than 60%, unconfined compression strength is 395Kpa, and in leach liquor, each heavy metal substance concentration all is less than relevant criterion, therefore can reach security landfill requirement or native requirement for building.
Claims (1)
1. the solidification and stabilization method for sludge from wastewater treatment plant, it is characterized in that, at ambient temperature, industrial residue, silicate cement are mixed according to a certain percentage, as sludge curing stablizer and sludge agitation evenly after maintenance 7 days, make water ratio and the intensity of mud reach landfill and native requirement for building, wherein the industrial residue mixture is: flyash, coal gangue, slag, phosphogypsum, unslaked lime are mixed, each components by weight is as follows: flyash 15%, coal gangue 20%, slag 20%, phosphogypsum 40%, unslaked lime 5%; It is as follows that industrial residue mixture, silicate cement mix each components by weight: industrial residue 55%, silicate cement 45%; Curing stablizer accounts for 10% of mud gross weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210398187.6A CN102897992B (en) | 2012-10-18 | 2012-10-18 | Method for solidifying and stabilizing sludge from urban sewage treatment plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210398187.6A CN102897992B (en) | 2012-10-18 | 2012-10-18 | Method for solidifying and stabilizing sludge from urban sewage treatment plant |
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| Publication Number | Publication Date |
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| CN102897992A CN102897992A (en) | 2013-01-30 |
| CN102897992B true CN102897992B (en) | 2014-01-08 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143555A (en) * | 2013-01-31 | 2013-06-12 | 清华大学 | Reducibility solidification stabilization method of processing soil polluted by toxic organics |
| CN103130396A (en) * | 2013-03-11 | 2013-06-05 | 绍兴伊诺环保科技有限公司 | Sludge modification method |
| CN104418560B (en) * | 2013-08-20 | 2017-01-18 | 深圳市铁汉生态环境股份有限公司 | Curing agent for treating heavy metal pollution and heavy metal curing method |
| CN103641518B (en) * | 2013-11-28 | 2015-12-30 | 上海老港废弃物处置有限公司 | A kind of composite mud for planting fresh flower |
| CN103693943B (en) * | 2013-12-09 | 2014-12-31 | 北京工业大学 | Method for firing ceramsite with sludge dehydrated through conditioning |
| CN105036516A (en) * | 2015-07-03 | 2015-11-11 | 天津霍普环保科技有限公司 | Preparation method of industrial waste residue-based sludge drying agent |
| CN106433652A (en) * | 2016-10-17 | 2017-02-22 | 安徽理工大学 | Curing agent for remediation of lead-contaminated soil, preparation method of curing agent and application of curing agent |
| CN107399889A (en) * | 2017-07-25 | 2017-11-28 | 云南大地绿坤环保科技有限公司 | A kind of preparation of heavy metal sewage sludge stabilizer and application process |
| CN109665774B (en) * | 2018-12-24 | 2022-04-08 | 四川正升环保科技有限公司 | Sludge solidification stabilization composite material and preparation method thereof, sludge solidification stabilization treatment method and solidified sludge |
| CN112408732A (en) * | 2020-11-24 | 2021-02-26 | 肇庆市武大环境技术研究院 | Sludge curing agent and application thereof |
| CN112409105A (en) * | 2020-12-03 | 2021-02-26 | 郑州大学 | Soil conditioner for mining and metallurgy sludge-based forests and preparation method thereof |
| CN113336498A (en) * | 2021-06-18 | 2021-09-03 | 山西大学 | Municipal sludge-based artificial planting soil and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101885575A (en) * | 2010-07-02 | 2010-11-17 | 广东工业大学 | Solidification/stabilization treatment method for papermaking sludge |
| CN101891367A (en) * | 2010-06-30 | 2010-11-24 | 苏州科技学院 | Solidification and stabilization method of urban sludge |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891367A (en) * | 2010-06-30 | 2010-11-24 | 苏州科技学院 | Solidification and stabilization method of urban sludge |
| CN101885575A (en) * | 2010-07-02 | 2010-11-17 | 广东工业大学 | Solidification/stabilization treatment method for papermaking sludge |
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