CN102603153B - Curing agent for solidification/stabilization of dewatered sludge of sewage plant and application of curing agent - Google Patents

Curing agent for solidification/stabilization of dewatered sludge of sewage plant and application of curing agent Download PDF

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Publication number
CN102603153B
CN102603153B CN 201210066210 CN201210066210A CN102603153B CN 102603153 B CN102603153 B CN 102603153B CN 201210066210 CN201210066210 CN 201210066210 CN 201210066210 A CN201210066210 A CN 201210066210A CN 102603153 B CN102603153 B CN 102603153B
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China
Prior art keywords
curing agent
dewatered sludge
sludge
solidifying agent
solidification
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CN 201210066210
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Chinese (zh)
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CN102603153A (en
Inventor
朱伟
孙晓辉
徐志荣
龚淼
李磊
孙政
张会文
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河海大学
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Priority to CN 201210066210 priority Critical patent/CN102603153B/en
Publication of CN102603153A publication Critical patent/CN102603153A/en
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Publication of CN102603153B publication Critical patent/CN102603153B/en

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Abstract

Disclosed are curing agent for solidification/stabilization of dewatered sludge of a sewage plant and application of the curing agent. Chemical components of the curing agent includes, by mass, from 3 to 8 parts of SiO2, from 25 to 35 parts of Al2O3, from 32 to 43 parts of CaO, from 15 to 23 parts of SO3, from 1 to 3 parts of Fe2O3 and from 0.1 to 0.3 part of Li2O. After the curing agent is addedinto the dewatered sludge, solidification materials quickly react with moisture in the dewatered sludge to form a needle-shaped framework, and accordingly the strength of solidified sludge is improved. Besides, the yield of products is increased along with reaction, the specific surface area of the products is large, the products have a high adsorption effect, and effects of stabilization and pollutant sealing are achieved along with increase of compactness of solidified bodies.

Description

Solidifying agent and application thereof that Sewage Plant dewatered sludge curing/stabilizing is handled
Technical field
The present invention relates to solidifying agent and application thereof that a kind of Sewage Plant dewatered sludge curing/stabilizing is handled.
Background technology
At present, the technology of disposing at China sludge treatment is various, and as landfill, burning, compost etc., but wherein the easiest what accepted by China's national situation is mud pre-treatment landfill, can guarantee that sewage sludge harmlessness handles, and meets the economic level of current China again.The common mode of pre-treatment landfill is the sludge curing/stabilizing treatment technology, in Guangdong, Jiangsu, zhejiang and other places carried out rig-site utilization.In application process, find make the disposal field take a large amount of areas, and disposition to be vulnerable to the influence of weather owing to be subjected to the restriction of traditional solidifying agent curing age (be 3 days the general length of time).If closed processing is carried out in the maintenance place, increased the sludge treatment cost again greatly.In addition, still there is the surface strength height in traditional solidifying agent in application process, and the problem that internal intensity is low need be stirred by machinery, or the mode of thickness solves when reducing maintenance, has increased processing cost virtually.Therefore, seek a kind of suitable solidifying agent at the problems referred to above, (1 day or a few hours) interior intensity reaches the requirement (50kPa) of landfill in a short time, and realizes the inside and outside uniform intensity.
In addition, in the sludge curing treating processes, generally between 20~25%, high incorporation has caused curing mud volume to increase to the incorporation of solidify material, does not realize the processing of sludge reduction at present.Therefore, need when not reducing the solidification treatment effect, reduce the incorporation of solidifying agent.
Summary of the invention
The technical problem that solves:The purpose of this invention is to provide solidifying agent and application thereof that a kind of Sewage Plant dewatered sludge curing/stabilizing is handled, solve sludge curing/stabilizing handle in problems such as low, the inside and outside intensity heterogeneity of solidification sludge early strength, solidifying agent incorporation height.The solidifying agent of handling by the sludge curing that adopts patent of the present invention is between 8~12% the time at incorporation, the unconfined compression strength that can make solidification sludge in 1 day or a few hours reach 50kPa, and inside and outside intensity can be even.
Technical scheme:Sewage Plant dewatered sludge curing/stabilizing solidifying agent, chemical ingredients by mass parts is: SiO 2: 3~8, Al 2O 3: 25~35, CaO:32~43, SO 3: 15~23, Fe 2O 3: 1~3, Li 2O:0.1~0.3.
Preferred version one: chemical ingredients by mass parts is: SiO 2: 3, Al 2O 3: 35, CaO:40.7, SO 3: 18, Fe 2O 3: 3, Li 2O:0.3.
Preferred version two: chemical ingredients by mass parts is: SiO 2: 8, Al 2O 3: 25, CaO: 40.9, SO 3: 23, Fe 2O 3: 3, Li 2O:0.1.
Above-mentioned Sewage Plant dewatered sludge curing/stabilizing adds solidify material by weight with the application of solidifying agent in the dewatered sludge, mixing and stirring, and each component proportion is: mud 88~92%, solidifying agent 8~12%.
Preferred version one: add solidifying agent in the dewatered sludge by weight, mixing and stirring, solidifying agent accounts for 12% of whole system.
Preferred version two: add solidifying agent in the dewatered sludge by weight, mixing and stirring, solidifying agent accounts for 8% of whole system.
Beneficial effect:Effect of the present invention and advantage are: after this solidifying agent adding dewatered sludge, the moisture in solidify material and the dewatered sludge reacts rapidly, forms the needle-like skeleton, thereby the intensity of solidification sludge is improved.Simultaneously, along with the carrying out of reaction, this product growing amount is increasing, because the specific surface area of product is very big, has very strong adsorption, and along with the degree of compactness of cured body is more and more higher, thereby the effect that reaches stabilization and seal pollutent.Concrete this solidifying agent that adopts has following characteristics: 1) the material incorporation is low, reduces thereby make dewatered sludge solidify back volume increasing amount; 2) composition of solidifying agent is common is easy to get, and has finished product to sell, and is easy to form industrialization; 3) intensity of solidification sludge can be within 1 day (or a few hours) reach landfill desirable strength (50kPa), need not curing condition and reduce handling procedure, reduce processing cost; 4) solidification sludge pH<10 after handling can be used for landfill, also can be agricultural or be used as and banket.
By this solidifying agent to the dewatered sludge of Sewage Plant be cured/stabilization treatment after, the intensity of solidification sludge can reach the requirement of strength (〉 50kPa in " urban wastewater treatment firm sludge disposal mixing landfill shale " (CJ/T 249-2007) within 12~24 hours), and with in the past solidifying agent different be curing mud pH after the solidifying agent of this patent is handled be lower than<10.Therefore, the solidification sludge after solidifying agent of the present invention is handled only needs maintenance just can reach the requirement that mixes the landfill shale in one day fully.
Embodiment
Embodiment 1:
Each component of the present invention mixes by following weight percent and forms:
Mud 92%
Solidifying agent 8%
Hardener formula is: SiO 2: 6.4 kg, Al 2O 3: 24 kg, CaO:32.72 kg, SO 3: 14.4 kg, Fe 2O 3: 2.4 kg, Li 2O:0.08 kg.
In the present embodiment, the water ratio of mud is 74%, according to this proportioning, adds the solidify material of 80kg in 920kg mud, mixing and stirring, and 1 day unconfined compression strength of the mud after the processing can reach 60kPa, and coefficient of permeability is less than 10 -7Cm/s, pH<9.5 can be satisfied and be carried out that landfill is disposed or as the needs of landfill yard earthing.
Embodiment 2:
Each component of the present invention mixes by following weight percent and forms:
Mud 88%
Solidifying agent 12%
Hardener formula is: SiO 2: 3 .6kg, Al 2O 3: 42 kg, CaO:51.24 kg, SO 3: 19.2 kg, Fe 2O 3: 3.6 kg, Li 2O:0.36kg.
In the present embodiment, the water ratio of mud is 82%, according to this proportioning, adds the solidify material of 120kg in 880kg mud, mixing and stirring, and 1 day unconfined compression strength of the mud after the processing can reach 75kPa, and coefficient of permeability is less than 10 -7Cm/s, pH<10 can be satisfied and be carried out that landfill is disposed or as the needs of landfill yard earthing.
Embodiment 3:
Each component of the present invention mixes by following weight percent and forms:
Mud 90%
Solidifying agent 10%
Hardener formula is: SiO 2: 5kg, Al 2O 3: 32 kg, CaO:40.7 kg, SO 3: 19 kg, Fe 2O 3: 3 kg, Li 2O:0.3 kg.
In the present embodiment, the water ratio of mud is 80%, according to this proportioning, adds the solidify material of 100kg in 900kg mud, mixing and stirring, and 1 day unconfined compression strength of the mud after the processing can reach 72kPa, and coefficient of permeability is less than 10 -7Cm/s, pH<10 can be satisfied and be carried out that landfill is disposed or as the needs of landfill yard earthing.

Claims (1)

1. the application of the solidifying agent of Sewage Plant dewatered sludge curing/stabilizing processing is characterized in that hardener formula is: SiO 2: 3 .6kg, Al 2O 3: 42 kg, CaO:51.24 kg, SO 3: 19.2 kg, Fe 2O 3: 3.6 kg, Li 2O:0.36kg; Add solidify material in the dewatered sludge by weight, mixing and stirring, each component proportion is: mud 88%, solidifying agent 12%, wherein the water ratio of mud is 82%.
CN 201210066210 2012-03-14 2012-03-14 Curing agent for solidification/stabilization of dewatered sludge of sewage plant and application of curing agent CN102603153B (en)

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CN102603153B true CN102603153B (en) 2013-09-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104671635B (en) * 2015-01-27 2017-03-08 上海隧道工程有限公司 For processing the construction method of bored pile construction discarded slurry
CN104803567B (en) * 2015-02-14 2017-01-25 广州市正源环境工程有限公司 Sludge modifier, and method used for preparing subgrade soil from sludge via modification

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1103631A (en) * 1994-09-16 1995-06-14 新疆锂盐厂 Lithium-slag portland cement
CN101265070A (en) * 2008-04-17 2008-09-17 高康 Sludge solidifying agent and application thereof
CN101885575A (en) * 2010-07-02 2010-11-17 广东工业大学 Solidification/stabilization treatment method for papermaking sludge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1103631A (en) * 1994-09-16 1995-06-14 新疆锂盐厂 Lithium-slag portland cement
CN101265070A (en) * 2008-04-17 2008-09-17 高康 Sludge solidifying agent and application thereof
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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