CN1669973A - Sludge solidification treatment framework construction method - Google Patents
Sludge solidification treatment framework construction method Download PDFInfo
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- CN1669973A CN1669973A CNA2005100384356A CN200510038435A CN1669973A CN 1669973 A CN1669973 A CN 1669973A CN A2005100384356 A CNA2005100384356 A CN A2005100384356A CN 200510038435 A CN200510038435 A CN 200510038435A CN 1669973 A CN1669973 A CN 1669973A
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- sludge
- construction method
- solidification treatment
- framework construction
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- 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
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to sludge solidification treatment framework construction method which comprises charging discarded sludge containing high content of clay particle into sludge containing very little solid content rate, and charging a predetermined proportion of curing material, finally carrying out hydration reaction. Based on percentage by weight, the raw material comprises sludge 50-70%, hardening material 10-20%, sludge 20-30%.
Description
Technical Field
The invention relates to a new method for solidifying sludge, namely a sludge solidification treatment framework construction method, and belongs to the technical field of civil engineering materials.
Background
At present, the treatment of sludge mainly changes to agriculture, incineration treatment and landfill. The compost is converted into the agricultural product, and the sanitation index and the heavy metal index of untreated sludge are difficult to meet the agricultural standard. The investment and the operating cost of incineration treatment are relatively high. The sludge is sent to a sanitary landfill for landfill disposal, and because the sludge has high water content and poor mechanical property, engineering disasters of landfill sites such as landslides and the like are often caused when the untreated sludge directly enters the landfill. The traditional curing treatment technology is difficult to be popularized and applied on a large scale because of large consumption of curing materials and high cost. On the other hand, a lot of sludge is generated in many hydraulic engineering and civil engineering works such as the dredging of oceans, lakes and rivers, or the construction of urban subways, excavation of foundation pits and the like, and is usually disposed by mud dumping. The disposal method not only pollutes the environment around the mud throwing point, but also occupies a large amount of farmlands or fishponds. According to the requirements of environmental protection and sustainable development, the heavily polluted sludge is added with the waste sludge to construct a framework, and the treated sludge can meet the requirements of landfill treatment or be converted into renewable resources for utilization through a solidification treatment means.
Disclosure of Invention
The invention aims to provide a framework construction method for sludge solidification treatment, which aims to solve the problem of treatment and resource utilization of a large amount of sludge generated in engineering, and the treated sludge can meet the requirements of landfill treatment or resource utilization. The technical scheme of the invention is as follows: waste sludge with high clay particle content is added into sludge with extremely low solid content, a certain proportion of curing material is added, a framework is constructed in the sludge through the cementing action of hydrate generated by hydration reaction on clay particles, and the harm of the sludge to the environment is reduced by utilizing the stabilizing and sealing action of the hydrate on pollutants, wherein the curing material (consisting of cement, fly ash and gypsum) and the sludge are added into the sludge according to a certain proportion and are uniformly mixed to form the sludge, and the sludge is prepared by the following steps of:
50-70% of sludge
10-20% of curing material
20-30% of sludge.
The invention has the advantages and effects that: (1) the treatment cost is greatly reduced: compared with the traditional solidification treatment measures, the method increases the skeleton components in the sludge, and can greatly reduce the consumption of solidification materials, thereby reducing the treatment cost; (2) the aim of treating waste by waste is achieved: the added framework component is waste sludge generated by dredging, so that the environmental problem caused by a large amount of dredged sludge can be reduced while the problem of a large amount of generated sludge is solved; (3) and (3) diversification of the outlet after sludge treatment: according to the method, according to actual needs, the addition amount of materials is optimized, so that the sludge can be subjected to landfill treatment after being treated, and can also be subjected to resource utilization, such as being used as a cover layer or a filling material of a landfill;
Detailed Description
Example 1:
the invention is prepared by uniformly mixing the following components in percentage by weight:
63.5 percent of sludge
15.0 percent of cement
21.5 percent of silt
According to the proportion, 236.2kg of solidifying material and 338.6kg of sludge are added into each ton of sludge to solidify the sludgeThe unconfined compressive strength of the sludge for 7 days can reach 50kPa, and the water permeability coefficient of the solidified sludge is less than 10-7cm/s，
Can meet the requirement of landfill disposal of the sludge or covering soil of a landfill site. Compared with a method without adopting a framework for construction, the method can save the cost by about 10 times when the same curing effect is achieved.
Example 2:
the invention is prepared by uniformly mixing the following components in percentage by weight:
55.1 percent of sludge
13.1 percent of cement
2.3 percent of fly ash
29.5 percent of sludge
By utilizing the proportion, 279.5kg of curing materials (cement and fly ash) and 535.4kg of sludge are added into each ton of sludge, and the unconfined compressive strength of the cured sludge for 7 days can reach 100 kPa. Can meet the requirement of filling soil for general engineering, and can save nearly 12 times of cost compared with a method without adopting a framework for construction.
Example 3:
the invention is prepared by uniformly mixing the following components in percentage by weight:
57.5 percent of sludge
11.1 percent of cement
2.7 percent of gypsum
2.2 percent of fly ash
26.5 percent of sludge
By utilizing the proportion, 278.3kg of solidifying materials (cement, fly ash and gypsum) and 460.8kg of sludge are added into each ton of sludge, and the unconfined compressive strength of the solidified sludge for 7 days can reach 85 kPa. Can meet the requirement of filling soil for general engineering, and can save nearly 14 times of cost by reaching the same curing effect compared with a method without adopting a framework for construction.
Principle description of skeleton construction: because the main solid components in the sludge mainly comprise organic matters and biological residues and the inorganic solid particle components are very little, the strength formed after the solidification treatment mainly depends on hydration products formed by hydration reaction, and the contribution of the sludge to the strength is very little, so that a large amount of solidification materials are consumed to obtain a certain strength. The sludge is mixed with a certain amount of sludge, a skeleton of solidified products is formed through the reaction of the sludge and solidified materials, and water in the sludge is absorbed and fixed during hydration reaction, so that organic matter particles of the sludge are wrapped in the skeleton. The effect of improving the strength of a solidified body and sealing pollutants is achieved through the framework, and the cost of solidification treatment is reduced. The curing reaction equation between the curing material and the main constituent of the framework, namely the sludge, is as follows (1) to (7):
hydrolysis reaction formulae (1) to (4):
hydration reactions (5) to (7):
description of the reaction principle: much Ca (OH) is formed in the hydrolysis reaction2(as shown in formulas 1 and 2), solidifying SiO in the material2And Ca (OH)2The reaction of formula (5) occurs to form calcium silicate hydrate crystals, which produce cementation between soil particles, known as pozzolanic reaction, that can significantly promote strength growth. CaSO in cured materials4CaO&Al produced by the reaction2O3·3CaSO4·32H2O is called ettringite, utensilThere are 32 crystal waters, in whichIn the process, the solid phase volume is increased by about 120 percent, and the effects of filling pores and reducing pore diameters can be achieved, thereby greatly contributing to the curing strength.
Claims (1)
1. A sludge solidification treatment framework construction method is characterized in that waste sludge with high clay particle content is added into sludge with extremely low solid content, a certain proportion of solidification materials are added, a framework is constructed in the sludge through the cementation of hydrate generated by hydration reaction on clay particles, the solidification materials and the sludge are added into the sludge according to a certain proportion and are uniformly mixed, and the sludge solidification treatment framework construction method is formed by the following steps of:
50-70% of sludge
10-20% of curing material
20-30% of sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100384356A CN1669973A (en) | 2005-03-14 | 2005-03-14 | Sludge solidification treatment framework construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100384356A CN1669973A (en) | 2005-03-14 | 2005-03-14 | Sludge solidification treatment framework construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1669973A true CN1669973A (en) | 2005-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100384356A Pending CN1669973A (en) | 2005-03-14 | 2005-03-14 | Sludge solidification treatment framework construction method |
Country Status (1)
| Country | Link |
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| CN (1) | CN1669973A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579683B (en) * | 2009-05-27 | 2010-12-08 | 河海大学 | Phosphogypsum-sludge combined curing treatment method |
| CN106110759A (en) * | 2016-08-11 | 2016-11-16 | 上海洗霸科技股份有限公司 | Environment-friendly type paint slag dehydrating and conditioning agent and application thereof |
| CN106187092A (en) * | 2016-09-08 | 2016-12-07 | 河海大学 | A kind of method utilizing mud and mud to fire sponge brick |
-
2005
- 2005-03-14 CN CNA2005100384356A patent/CN1669973A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579683B (en) * | 2009-05-27 | 2010-12-08 | 河海大学 | Phosphogypsum-sludge combined curing treatment method |
| CN106110759A (en) * | 2016-08-11 | 2016-11-16 | 上海洗霸科技股份有限公司 | Environment-friendly type paint slag dehydrating and conditioning agent and application thereof |
| CN106187092A (en) * | 2016-09-08 | 2016-12-07 | 河海大学 | A kind of method utilizing mud and mud to fire sponge brick |
| CN106187092B (en) * | 2016-09-08 | 2019-03-01 | 河海大学 | A method of sponge brick is fired using sludge and mud |
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