CN103086670A - Method for curing lake dredged sediment containing heavy metal - Google Patents

Method for curing lake dredged sediment containing heavy metal Download PDF

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Publication number
CN103086670A
CN103086670A CN2013100367849A CN201310036784A CN103086670A CN 103086670 A CN103086670 A CN 103086670A CN 2013100367849 A CN2013100367849 A CN 2013100367849A CN 201310036784 A CN201310036784 A CN 201310036784A CN 103086670 A CN103086670 A CN 103086670A
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CN
China
Prior art keywords
heavy metal
bed mud
waste gypsum
flyash
solidifying agent
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CN2013100367849A
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Chinese (zh)
Inventor
肖文胜
陶敏
马敏
殷斌
张家泉
刘婷
白翠萍
吕继良
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湖北理工学院
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Priority to CN2013100367849A priority Critical patent/CN103086670A/en
Publication of CN103086670A publication Critical patent/CN103086670A/en

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Abstract

The invention belongs to a treatment method of solid waste in environmental engineering, and particularly relates to a method for curing lake dredged sediment containing heavy metal. The method is characterized by comprising the steps of adding a curing agent prepared from waste gypsum, coal ash and cement in a mixing manner to lake dredged sediment containing heavy metal, evenly stirring, and covering a plastic film on the surface for molding for 1-3 days; and maintaining for 2-10 days under the conditions that the temperature is 20+/-(3-6) DEG C and the relative humidity is 70-100% to obtain a solidified clod of which the unconfined compression strength is greater than or equal to 170.6kpa, wherein the weight ratio of the waste gypsum to the coal ash to the cement is 1 to (0.5-10) to (1-15); and the adding amount of the curing agent is 3-20% of mass of the lake dredged sediment containing the heavy metal. Industrial wastes such as the coal ash, the waste gypsum and the like are taken as curing agent materials of heavy metal polluted sediment; and resource utilization of the wastes such as the polluted sediment, the coal ash and the waste gypsum is achieved, so as to achieve the target of treatment of wastes with processes of wastes against one another.

Description

A kind of method that contains the curing of heavy metal lake dredging bed mud
Technical field
The invention belongs to the treatment process of solid waste in environmental engineering, specifically a kind of method that contains the curing of heavy metal lake dredging bed mud.
Background technology
At present, polluted bed mud has become the potential endogenous load in lake, and the migration of pollutent in bed mud (heavy metal) is having a strong impact on the water quality condition in lake.The Sediment Dredging technology by with serious pollution lake, section are dredged, desilting, can recover the normal function of water body; It is a kind of directly, the governance way of successful, the impact of forever decontamination bed mud on lake water quality.
Yet the safe disposal of the polluted bed mud of dredging out is a technical barrier always.The conventional disposal options of dredging bed mud mainly contains stackings, depression backfill, establishment land, land reclamation, building materials utilization and ocean and throws aside etc.But, above disposal options all run into dredging bed mud water ratio high, be in flow state, be not easy to vehicle transport, and have that floor space is excessive, soil mechanical properties are relatively poor, cost is difficult to the problems such as control; Simultaneously, dredging contains a large amount of hazardous contaminants in bed mud, and heavy metal especially will be if direct landfill and not processing will cause the secondary pollutions such as heavy metal migration.
Current, conventional solution is: utilize cement and auxiliary material (lime, slag, slag, silica flour etc.) to be cured processing to the lake dredging bed mud, but have the following disadvantages:
1, in the bed mud solidification process, lime can with bed mud in steeping in water for reconstitution give birth to reaction, but the calcium hydroxide that generates has inhibition to hydrated reaction of cement, thereby solidification effect is relatively poor; Slag, slag, silica flour only play the framework construction effect, not with bed mud in steeping in water for reconstitution give birth to reaction, thereby the bed mud water ratio is difficult to descend, the curing conservation time is longer.
2, because the auxiliary materials such as lime, slag, slag, silica flour mainly play the framework construction effect, compare waste gypsum and flyash, its gelling solidification effect is relatively poor, thereby can process general bottom mud in lake, inapplicable for the curing that contains the heavy metal bottom mud in lake, in curing bed mud leach liquor, heavy metal content may exceed standard.
Summary of the invention
Purpose of the present invention is exactly the problem that exists for prior art, and a kind of method that heavy metal lake dredging bed mud solidifies that contains is provided; Present method utilizes industrial waste to solidify the heavy metal polluted bed mud of lake dredging, reduces water ratio, is convenient to the transportation of bed mud; Simultaneously, make and solidify bed mud and have highlyer without side pressure strength, in leach liquor, heavy metal content lower than " Hazardous wastes judging standard leaching characteristic identification " (GB5085.3-2007) limit value, can be used as the isobaric practical soil of roadbed.
A kind of method that heavy metal lake dredging bed mud solidifies that contains of the present invention first joins the solidifying agent of making after waste gypsum, flyash, cement mixing and contains in heavy metal lake dredging bed mud, stirs, and at the surface coverage plastics film, moulding 1-3 days; Be under 70~100% condition maintenance 2-10 days at 20 ± 3~6 ℃, relative humidity again, namely obtain the curing clod without side ultimate compression strength 〉=170.6kpa; The quality proportioning of described waste gypsum, flyash, cement is 1: (0.5~10): (1~15); The add-on of described solidifying agent is to contain 3~20% of heavy metal lake dredging bed mud quality.
Described to contain heavy metal lake dredging bed mud water ratio be 60~80%, contains Pb 〉=450mg/kg, Cu 〉=640mg/kg, Cr 〉=640mg/kg, Hg 〉=0.8mg/kg, Cd 〉=0.7mg/kg, As 〉=150mg/kg, is the high heavy metal heavily contaminated bed mud of water ratio.
Fort board 32.5 composite Portland cements that the solidifying agent of preparation described in the present invention cement preference Huaxin Concrete Co., Ltd used produces.
Waste after the thermal power generation of the preferred Hubei of the waste gypsum that described preparation solidifying agent is used and flyash China electric Huangshi generating limited-liability company is produced wherein mainly contains 56.67% SO in waste gypsum 3CaO with 38.14% mainly contains 50.49% SiO in flyash 2, 30.68% Al 2O 3, 3.74% Fe 2O 3, 3.48% CaO.
When waste gypsum joins the lake dredging bed mud, can be rapidly and the steeping in water for reconstitution in bed mud give birth to reaction, make bed mud water ratio fast-descending, thereby the bed mud curing speed is fast, curing time is short.Flyash is a kind of good consolidating material, after flyash and cement add bed mud together, hydration reaction occurs rapidly generate the gel ion, can be with the sediment particles gelling together, form hard crumb structure, thereby the solid piece of bed mud has stronger without side pressure strength.Simultaneously, the gel ion ratio surface-area of generation has enlarged 1000 times, has strong absorption property, the heavy metal ion in bed mud can be fixed in the solid piece of bed mud, thereby effectively prevent the migration of heavy metal.
The inventive method compared with prior art has following characteristics:
(1) utilize the industrial wastes such as flyash, waste gypsum as the solidifying agent material of heavy metal polluted bed mud, realized the recycling of the refuses such as polluted bed mud, flyash, waste gypsum, reached the purpose of the treatment of wastes with processes of wastes against one another;
(2) curing bed mud curing time is shorter, and water ratio is low, is convenient to the transportation of mud;
(3) solidify bed mud and have highlyer without side pressure strength, satisfy the landfill requirement, also can be used as the isobaric practical soil of roadbed;
(4) solidify in the bed mud leach liquor heavy metal content lower than " Hazardous wastes judging standard leaching characteristic identification " (GB5085.3-2007) limit value, can not cause secondary pollution.
The inventive method also is applicable to the disposal that is subjected to Heavy metal contaminated soil, contains the heavy metal excess sludge.
Embodiment
Embodiment 1:
Take Huangshi, Hubei Province Qinshan Lake heavy metal polluted bed mud, water ratio is 60%; After testing, contain Pb 480mg/kg, Cu 860mg/kg, Cr 10mg/kg, Hg 0.8mg/kg, Cd 0.7mg/kg, As 340mg/kg in bed mud, be heavy metal heavily contaminated bed mud.At first, with cement, waste gypsum and flyash in mass ratio 1:5:10 mix and make solidifying agent, then solidifying agent is added in bed mud, the dosage of solidifying agent is 10% of bed mud quality; Utilize sludge stirring machine to mix, form mud mixture; Put it into and add film in square grinding tool and cover, moulding was put into curing room after 1 day; Under the condition of 20 ± 3 ℃ of temperature, relative humidity 90%, maintenance is after 2 days, and what solidify clod reaches 170.6KPa without side ultimate compression strength, satisfies the requirement of solidify ﹠ bury, can be used as the isobaric practical soil of roadbed.After testing, solidify that in the bed mud leach liquor, Pb, Cu, Cr, Hg, Cd, As content are respectively 0.062mg/L, 0.675mg/L, do not detect, do not detect, do not detect, 0.157mg/L, lower than " Hazardous wastes judging standard leaching characteristic identification " (GB5085.3-2007) limit value.
Embodiment 2
Take Huangshi, Hubei Province The Magnetic Lake heavy metal polluted bed mud, water ratio is 72%; After testing, contain Pb 450mg/kg, Cu 640mg/kg, Cr 55mg/kg, Hg 1.5mg/kg, Cd 1.2mg/kg, As 150mg/kg in bed mud, be heavy metal heavily contaminated bed mud.At first, with cement, waste gypsum and flyash in mass ratio 1:10:15 mix and make solidifying agent, then solidifying agent is added in bed mud, the dosage of solidifying agent is 20% of bed mud quality; Utilize sludge stirring machine to mix, form mud mixture; Put it into and add film in square grinding tool and cover, moulding was put into curing room after 3 days; Under the condition of 20 ± 6 ℃ of temperature, relative humidity 100%, maintenance is after 10 days, and what solidify clod reaches 190.6KPa without side ultimate compression strength, satisfies the requirement of solidify ﹠ bury, can be used as the isobaric practical soil of roadbed.After testing, solidify that in the bed mud leach liquor, Pb, Cu, Cr, Hg, Cd, As content are respectively 0.047mg/L, 0.963mg/L, 0.007 mg/L, do not detect, 0.012mg/L, 0.085mg/L, lower than " Hazardous wastes judging standard leaching characteristic identification " (GB5085.3-2007) limit value.
Embodiment 3
Take Huangshi, Hubei Province The Magnetic Lake heavy metal polluted bed mud, water ratio is 67%; After testing, contain Pb 850mg/kg, Cu 1100mg/kg, Cr 74mg/kg, Hg 1.0mg/kg, Cd 3.2mg/kg, As 200mg/L in bed mud, be heavy metal heavily contaminated bed mud.At first, with cement, waste gypsum and flyash in mass ratio 1:0.5:1 mix and make solidifying agent, then solidifying agent is added in bed mud, the dosage of solidifying agent is 3% of bed mud quality; Utilize sludge stirring machine to mix, form mud mixture; Put it into and add film in square grinding tool and cover, moulding was put into curing room after 2 days; Under the condition of 20 ± 4 ℃ of temperature, relative humidity 70%, maintenance is after 6 days, and what solidify clod reaches 97.5KPa without side ultimate compression strength, satisfies the requirement of solidify ﹠ bury, can be used as the isobaric practical soil of roadbed.After testing, solidify that in the bed mud leach liquor, Pb, Cu, Cr, Hg, Cd, As content are respectively 0.118mg/L, 1.106mg/L, 0.013mg/L, do not detect, 0.006 mg/L, 0.097mg/L, lower than " Hazardous wastes judging standard leaching characteristic identification " (GB5085.3-2007) limit value.

Claims (4)

1. one kind contains the method that heavy metal lake dredging bed mud solidifies, and it is characterized in that: the solidifying agent of making after waste gypsum, flyash, cement mixing is joined contain in heavy metal lake dredging bed mud, stir, and at the surface coverage plastics film, moulding 1-3 days; Be under 70~100% condition maintenance 2-10 days at 20 ± 3~6 ℃, relative humidity again, namely obtain the curing clod without side ultimate compression strength 〉=170.6kpa; The quality proportioning of described waste gypsum, flyash, cement is 1: (0.5~10): (1~15); The add-on of described solidifying agent is to contain 3~20% of heavy metal lake dredging bed mud quality.
2. a kind of method that heavy metal lake dredging bed mud solidifies that contains according to claim 1, it is characterized in that: described to contain heavy metal lake dredging bed mud water ratio be 60~80%, contain Pb 〉=450mg/kg, Cu 〉=640mg/kg, Cr 〉=640mg/kg, Hg 〉=0.8mg/kg, Cd 〉=0.7mg/kg, As 〉=150mg/kg, be the high heavy metal heavily contaminated bed mud of water ratio.
3. a kind of method that heavy metal lake dredging bed mud solidifies that contains according to claim 1, it is characterized in that: described preparation solidifying agent cement used is fort board 32.5 composite Portland cements that Huaxin Concrete Co., Ltd produces.
4. a kind of method that heavy metal lake dredging bed mud solidifies that contains according to claim 1, it is characterized in that: the waste gypsum that described preparation solidifying agent is used and flyash all are selected from the waste after the thermal power generation of Hubei China electric Huangshi generating limited-liability company is produced, and wherein mainly contain 56.67% SO in waste gypsum 3CaO with 38.14% mainly contains 50.49% SiO in flyash 2, 30.68% Al 2O 3, 3.74% Fe 2O 3, 3.48% CaO.
CN2013100367849A 2013-01-31 2013-01-31 Method for curing lake dredged sediment containing heavy metal CN103086670A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104386888A (en) * 2014-06-08 2015-03-04 何晋勇 Immobilization processing method for composite heavy-metal-polluted bottom sediment
CN105294033A (en) * 2014-07-29 2016-02-03 邱景新 Industrial solid waste solidified building material and process for solidifying solid industrial waste into building material
CN105314940A (en) * 2014-07-10 2016-02-10 鞍钢股份有限公司 Cement solidified waste and toxic chromium slag processing method thereof
CN105622023A (en) * 2015-12-31 2016-06-01 宁波高新区围海工程技术开发有限公司 Silt curing agent using furnace slags
CN105967470A (en) * 2016-05-12 2016-09-28 江西洁地环境治理生态科技有限公司 Cadmium copper lead polluted bottom mud curing agent and curing method thereof
CN106007276A (en) * 2016-05-25 2016-10-12 上海理工大学 Pretreatment and solidification method of heavy-metal-polluted river course sediment
CN106277858A (en) * 2016-08-16 2017-01-04 中电建水环境治理技术有限公司 Lake, river is gushed polluted bed mud and is processed and receive a micron modified adhesive gel material
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
CN106747197A (en) * 2017-01-05 2017-05-31 昆明理工大学 A kind of low-temp ceramics curing of arsenic heavy metal sewage sludge high
CN107473684A (en) * 2017-09-11 2017-12-15 广州中科地化环保工程有限公司 A kind of creek deposit environment-friendly treatment agent
CN108947199A (en) * 2018-07-11 2018-12-07 河海大学 A kind of neutral dehydrating agent of gypsum base mud plate compression and its application
CN109111927A (en) * 2018-08-14 2019-01-01 东南大学 A kind of heavy metal pollution sandy soil curing agent and its application method
CN109320035A (en) * 2018-12-11 2019-02-12 环境保护部华南环境科学研究所 Cured method and application after a kind of quickening bottom-mud dewatering
CN109809781A (en) * 2019-03-08 2019-05-28 江南大学 Fabricated construction lightweight wall key technology is done in Dredged bed mud solidification
CN109970397A (en) * 2018-12-25 2019-07-05 安徽佳明环保科技股份有限公司 A kind of efficient bed mud curing agent and its preparation and application

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104386888A (en) * 2014-06-08 2015-03-04 何晋勇 Immobilization processing method for composite heavy-metal-polluted bottom sediment
CN105314940A (en) * 2014-07-10 2016-02-10 鞍钢股份有限公司 Cement solidified waste and toxic chromium slag processing method thereof
CN105314940B (en) * 2014-07-10 2017-05-24 鞍钢股份有限公司 Cement solidified waste and toxic chromium slag processing method thereof
CN105294033A (en) * 2014-07-29 2016-02-03 邱景新 Industrial solid waste solidified building material and process for solidifying solid industrial waste into building material
CN105622023A (en) * 2015-12-31 2016-06-01 宁波高新区围海工程技术开发有限公司 Silt curing agent using furnace slags
CN105967470A (en) * 2016-05-12 2016-09-28 江西洁地环境治理生态科技有限公司 Cadmium copper lead polluted bottom mud curing agent and curing method thereof
CN105967470B (en) * 2016-05-12 2019-06-11 江西洁地环境治理生态科技有限公司 A kind of cadmium copper lead contamination bed mud curing agent and its curing method
CN106007276A (en) * 2016-05-25 2016-10-12 上海理工大学 Pretreatment and solidification method of heavy-metal-polluted river course sediment
CN106277858B (en) * 2016-08-16 2018-03-16 中电建水环境治理技术有限公司 River lake gush polluted bed mud processing receive micron be modified binder materials
CN106277858A (en) * 2016-08-16 2017-01-04 中电建水环境治理技术有限公司 Lake, river is gushed polluted bed mud and is processed and receive a micron modified adhesive gel material
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
CN106747197A (en) * 2017-01-05 2017-05-31 昆明理工大学 A kind of low-temp ceramics curing of arsenic heavy metal sewage sludge high
CN107473684A (en) * 2017-09-11 2017-12-15 广州中科地化环保工程有限公司 A kind of creek deposit environment-friendly treatment agent
CN108947199A (en) * 2018-07-11 2018-12-07 河海大学 A kind of neutral dehydrating agent of gypsum base mud plate compression and its application
CN109111927A (en) * 2018-08-14 2019-01-01 东南大学 A kind of heavy metal pollution sandy soil curing agent and its application method
CN109111927B (en) * 2018-08-14 2020-07-31 东南大学 Heavy metal polluted sandy soil curing agent and application method thereof
CN109320035A (en) * 2018-12-11 2019-02-12 环境保护部华南环境科学研究所 Cured method and application after a kind of quickening bottom-mud dewatering
CN109970397A (en) * 2018-12-25 2019-07-05 安徽佳明环保科技股份有限公司 A kind of efficient bed mud curing agent and its preparation and application
CN109809781A (en) * 2019-03-08 2019-05-28 江南大学 Fabricated construction lightweight wall key technology is done in Dredged bed mud solidification

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