CN1303018C - Sludge heavy metal disposing method in land utilization - Google Patents

Sludge heavy metal disposing method in land utilization Download PDF

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Publication number
CN1303018C
CN1303018C CNB2003101087964A CN200310108796A CN1303018C CN 1303018 C CN1303018 C CN 1303018C CN B2003101087964 A CNB2003101087964 A CN B2003101087964A CN 200310108796 A CN200310108796 A CN 200310108796A CN 1303018 C CN1303018 C CN 1303018C
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China
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heavy metal
mud
sludge
fixing agent
lime
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CNB2003101087964A
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CN1544366A (en
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赵建夫
陈玲
马利民
夏四清
孙颖
方萍
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Tongji University
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Tongji University
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Abstract

The present invention discloses a treating method for contained heavy metal during sludge land utilization, which relates to a treating technology for heavy metal contained in sludge. Sulfide and lime are used as a fixing agent; according to the variety and the content of heavy metal contained in sludge, the formula and the adding amount of the sulfide and the lime are adjusted; in detail, the sulfide and the lime are weighed according to the weight ratio of the sulfide to the lime, which ranges from 0.3 to 3, and consequently, the fixing agent is prepared; the fixing agent of which the weight percentage ranges from 0.5% to 20% in terms of the sludge is added to the sludge; the fixing agent and the sludge are uniformly stirred, and stabilization treatment is carried out for 2 to 15 days; the sludge which is in conformity with the requirements for land utilization is finally obtained. The method of the present invention has favorable treating effect because the leaching rate of the heavy metal in the fixed sludge accounts for 1/300 to 1/200 of the leaching rate of the heavy metal in the sludge which is not fixed, and the residual amount of the heavy metal completely conforms to the national standards of land utilization. The present invention has the advantages of simple technology and low treatment cost because the treatment cost of each ton of the sludge is just 5 to 20 yuan. The technology of the present invention has little compatibilization or no compatibilization so that the subsequent cost of transportation, storage and treatment and the number of treatment containers are greatly reduced. The present invention can be widely used as the treating technology for heavy metal contained in sludge during the land utilization of the sludge from different urban sewage treatment plants.

Description

The treatment process of contained heavy metal when the mud soil utilizes
Technical field
The present invention relates to the treatment process of contained heavy metal in a kind of mud, when further relating to mud soil with municipal wastewater treatment plant and utilizing, the treatment process of the heavy metal contaminants in the mud.
Background technology
Along with Increase of population, industrial expansion, the sanitary sewage that need handle and trade effluent are in continuous increase, and the sludge quantity that produces through handling is increase greatly also.Statistics according to relevant department, the annual dewatered sludge amount that produces of China is about 5,000,000 tons at present, if the mud of these enormous amount does not obtain appropriate science treatment and disposal, not only can take large-area soil could stack, and wherein objectionable constituent heavy metal, pathogen and organic pollutant etc., also can in environment, move or spread, jeopardize human and other biological safety.Particularly bring environmental problems such as river pollution water source into because of rainwater be one of focal issue that the environmentalist was concerned about to heavy metal contaminants wherein always.If mud is used as soil improvement agent, can improve Soil structure, increase soil fertility, also can be used for the reparation of contaminated soil.But the heavy metal in the mud can enter food chain by animal and plant and underground water, thereby enters human body, and human body is suffered damage.Though when using the mud soil to utilize, also carried out harmless treatments such as digestion, compost, fermentation, but major part such as heavy metal contaminants is still stayed in the mud in the mud, enter together in the soil with mud, migration or diffusion jeopardize human and other biological safety in environment.Though the insider has adopted the heavy metal in the following several method disposing sludge, the requirement when all not having to satisfy the mud soil and utilizing.
A. partition method: adopt chemistry, physics or biological methods such as chemical process, bioleaching, phytoremediation that heavy metal contaminants is taken out from mud, it is separated with mud, reach the purpose of decontamination.
Chemical process is exactly to reduce with the acidity of acid with mud earlier, pass through solvency action, carry out complexing action of chlorization, ion exchange, acidification, sequestrant and tensio-active agent etc. then with complexing agents such as EDTA, heavy metal is wherein separated, make the metallic compound of indissoluble attitude form soluble metal ion and metal complex, reach and the isolating purpose of mud.
Bioleaching be meant the aeration oxygen supply and add ferrous sulfate or the condition of sulphur grain under utilize the indirect action of the direct effects of some microorganisms of occurring in nature or its meta-bolites to make the insoluble composition (heavy metal ion sulphur and other metal) that is in absorption, combined form with solid phase be released and transfer to the process in the liquid phase.By solid-liquid separation heavy metal is separated with mud then.
Phytoremediation technology (pHytoremediation) is meant the general name of utilizing hazardous contaminant technology in plant extract, absorption, decomposition, conversion or fixing soil, settling, mud or the face of land, the underground water, what soon certain was specific has the plant growing of special absorbing enriched ability on the soil of heavy metal contamination to pollution element, this heavy metal species can be shifted out the soil body with the plant results and after dealing carefully with, reach the purpose of Pollution abatement and restoration of the ecosystem.
The shortcoming of aforesaid method is: separating of heavy metal extract and mud is very difficult, the processing cost height.And those absorbing enriched the plant of heavy metal, also exist and be difficult to further processing, and may cause the secondary pollution problem.
B. heavy metal is fixed in the mud.This method is exactly by physics, chemistry or biological mode the heavy metal in the mud to be cured (solidfication) to fix, add solidifying agent in mud, make it become not flowable or formation solid process, come pollution abatement by reducing its environment activity.Traditional technique for fixing is to use a large amount of cement solidifications.When solidification effect is undesirable, also can add other materials such as organic polymer, flyash, lime, clay, urea formaldehyde, pitch and water glass (as plastic material, melting material, from consolidating material, large-scale cover material or the like).The shortcoming of this method is: the mud after solidification treatment can not be as soil.Because adopt this solidified method to destroy the structure of the mud that is used for soil, fundamental property such as permeable, ventilative, and the volume of mud all is greatly increased.
In recent years, when handling the heavy metal refuse, abroad the someone adopts chemical stabilization medicament efficiently, makes hazardous and noxious substances change low-solubility, low migration and hypotoxicity material into by chemical reaction, reaches the purpose of eliminating the heavy metal refuse.Report that Shivel, human sulfide such as W.E handle the industrial waste that contains heavy metal as the stabilization medicament.But do not see useful its handle the simultaneous report of various heavy in the mud that content is low and kind is many.
Summary of the invention
The objective of the invention is to release a kind of when the mud soil is utilized, the method that can make the toxicity of the heavy metal contaminants in the mud reduce or eliminate, make mud after treatment meet the national standard (the leaching amount of heavy metal requires) that the mud soil utilizes, and treatment process is simple, processing cost is cheap.
In order to achieve the above object, the present invention is directed to the heavy metal contaminants in the municipal sewage sludge of soil in utilizing, develop a kind of fixing agent efficiently, change the form and the structure of heavy metal contaminants in the mud, reach and reduce or the purpose of decontamination.Through discovering repeatedly: heavy metal is stabilized in the mud, and promptly stabilization (stabilization) technology can meet the demands.Under the effect of fixing agent, heavy metal generation chemical reaction in the mud makes them change low-solubility, low migration and hypotoxicity material into from hazardous and noxious substances; Simultaneously the physical behavior of mud has also obtained change, and make mud and heavy metal generation encapsulate, condense and adsorption, thereby reach the effect of the heavy metal in the fixing mud, and, prescription that can also be by the levelling fixing agent and add dosage, the acquisition good result.
The present invention adopts sulfide and lime to prepare fixing agent by a certain percentage, and according to the mud of different municipal sewage plants, the dosage of adjusting prescription and adding carries out fixing/stabilising to the heavy metal in the mud and handles, and concrete steps are as follows:
The first step: heavy metal kind and Determination on content in the mud: mud is carried out sampling analysis, understand the kind and the content of contained heavy metal in the mud.
Second step: the preparation of fixing agent: according to the different sorts and the content of heavy metal in the mud, select the preparation fixing agent, press sulfide/lime=0.3-3 part by weight weighing then, the preparation fixing agent then, mixes, and is stand-by.
Sulfide comprises potassium sulphide, sodium sulphite, ammonium sulfide, sulfurated lime sulfides.
The 3rd step: technique for fixing: the 0.5%-20% weight percent of press sludge quantity adds above-mentioned second in the mud and goes on foot the fixing agent that disposes, stir, after adding fixing agent, mud is stablized 2-15 days again, reach the stable of requirement of the present invention at last and solidified the heavy metal in the mud, make it to meet the land use requirement.This technology can be carried out simultaneously with other harmless treatment process (as fermenting, push away fertilizer) of mud, and does not influence the heavy metal fixed effect.
Advantage of the present invention is as follows:
1. when adopting in the solidifying agent processing mud of forming by sulfide and lime heavy metal; fixing agent can be adjusted to the pH value of mud the scope that makes heavy metal ion have minimal solubility; can control the oxidation/reduction potential of heavy metal in the mud; generate under the stable common environment and can not leach metallic compound such as precipitation of hydroxide; sulfide precipitation; oxide precipitation; co-precipitation; inorganic complex precipitation and organic complex precipitation etc.; therefore; treatment effect of the present invention is good especially; the leaching yield of heavy metal is the 1/200-1/300 before fixing in the mud after fixing, and its residual volume meets the national standard that the soil utilizes fully.
2. because solidifying agent is industrial raw material, it is also low to mix the stirring requirement, as long as mixing under the room temperature, so technology of the present invention is simple, processing cost is cheap, and the processing cost of mud per ton only is a 5-20 unit.
3. through art breading of the present invention, when realizing mud, can accomplish the perhaps not increase-volume that reduces, greatly reduce the expense of follow-up transportation, storage and disposal as the innoxious use in soil, and can significantly reduce disposal container, improve the overall efficiency and the economy of treatment and disposal system.
Embodiment
Embodiment 1
The first step: the Shanghai municipal sewage sludge is carried out sampling analysis, and the heavy metal content of the mud that dispatches from the factory of this factory is Zn:3084, Cu:864, Ni:454 (mg/kg).
Second step: according to the employing analytical results to mud, selecting the preparation fixing agent is the sodium sulphite and the lime of technical grade, presses sodium sulphite/lime=1-1.2 part by weight weighing then, then, both is mixed, stand-by.
The 3rd step: technique for fixing: the fixing agent of 2% weight percent of press sludge quantity above-mentioned preparation of interpolation in the mud, stir, after adding fixing agent, again sewage sludge harmlessness (as fermenting, push away fertilizer) was handled 5-10 days, last sampling analysis, heavy metal content is in the mud of fixing back: Zn:20.6, Cu:3.9, Ni:3.9 (mg/kg), and reach the stable of requirement of the present invention and solidified the heavy metal in the mud, meet the land use requirement.
Embodiment 2
The first step: the Shanghai municipal sewage sludge is carried out sampling analysis, and the heavy metal content of the mud that dispatches from the factory of this factory is Zn:1653, Cu:159, Ni:22.2 (mg/kg).
Second step: according to the employing analytical results to mud, selecting the preparation fixing agent is potassium sulphide and lime, presses potassium sulphide/lime=0.3 part by weight weighing then, then, both is mixed, stand-by.
The 3rd step: technique for fixing: the fixing agent of 0.5% weight percent of press sludge quantity above-mentioned preparation of interpolation in the mud, stir, after adding fixing agent, again sewage sludge harmlessness (as fermenting, push away fertilizer) was handled 3-12 days, heavy metal content is in the mud of the fixing back of last sampling analysis: Zn:2.621, Cu:0.312, Ni:0.271 (mg/kg), reach the stable of requirement of the present invention and solidified the heavy metal in the mud, meet the land use requirement.
Embodiment 3
The first step: the Shanghai municipal sewage sludge is carried out sampling analysis, and the heavy metal content of the mud that dispatches from the factory of this factory is Zn:15890, Cu:3873, Ni:522.7 (mg/kg).
Second step: according to the employing analytical results to mud, selecting the preparation fixing agent is ammonium sulfide and lime, presses ammonium sulfide/lime=2.8 part by weight weighings then, then, both is mixed, stand-by.
The 3rd step: technique for fixing: the fixing agent of 15% weight percent of press sludge quantity above-mentioned preparation of interpolation in the mud, stir, after adding fixing agent, again sewage sludge harmlessness (as fermenting, push away fertilizer) was handled 5-15 days, heavy metal content is in the mud of the fixing back of last sampling analysis: Zn:30.562, Cu:12.35, Ni:5.263 (mg/kg), reach the stable of requirement of the present invention and solidified the heavy metal in the mud, meet the land use requirement.

Claims (2)

1. the treatment process of contained heavy metal when the mud soil utilizes, it is characterized in that: adopt sulfide and lime as fixing agent, according to the mud of different municipal sewage plants, the dosage of adjusting prescription and adding, heavy metal in the mud is carried out fixing/stabilising handle, concrete steps are as follows:
The first step: heavy metal kind and Determination on content in the mud: mud is carried out sampling analysis, understand the kind and the content of contained heavy metal in the mud;
Second step: the preparation of fixing agent: according to the different sorts contained in the mud and the heavy metal of content, select the preparation fixing agent, press sulfide/lime=0.3-3 part by weight weighing then, mix, stand-by;
The 3rd step: technique for fixing: the 0.5%-20% weight percent by sludge quantity adds fixing agent in mud, stir, sewage sludge harmlessness is handled 2-15 days again, reached the stable of requirement of the present invention at last and solidified the heavy metal in the mud, make it to meet the land use requirement.
2. the treatment process of contained heavy metal when mud according to claim 1 soil utilizes, it is characterized in that: described fixing agent preparation is as required, weighing technical grade potassium sulphide, sodium sulphite, ammonium sulfide, sulfurated lime and technical grade lime mix to stir evenly and make.
CNB2003101087964A 2003-11-21 2003-11-21 Sludge heavy metal disposing method in land utilization Expired - Fee Related CN1303018C (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100493743C (en) * 2004-12-15 2009-06-03 中国科学院沈阳应用生态研究所 Fixative for in situ harnessing heavy metal pollution of soil
CN101792245A (en) * 2010-04-02 2010-08-04 华南农业大学 Sludge treating and utilizing method for reducing heavy metal in sludge discharged in soil
CN102285743A (en) * 2010-12-28 2011-12-21 陈启松 Harmless treatment method for sludge containing heavy metals
CN102249515A (en) * 2011-07-14 2011-11-23 中交天津港航勘察设计研究院有限公司 Dredged mud dewatering method for small suction cutter dredger
CN102745872B (en) * 2012-07-26 2013-08-07 山东建筑大学 Treatment method and device for riverway and lake heavy metal pollution bottom sludge
CN103771675A (en) * 2013-12-24 2014-05-07 盐城工学院 Method for treating sludge from urban sewage plant to obtain land utilization mud
CN107473847A (en) * 2017-09-19 2017-12-15 南京仙草堂生物科技有限公司 A kind of biological organic fertilizer for improving Cadmium Pollution in Soils

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053401A (en) * 1974-11-29 1977-10-11 Nichireki Chemical Inudstry Co., Ltd Sludge treating process
US5007965A (en) * 1989-05-31 1991-04-16 Kansai Engineering Co., Ltd. Material for treating heavy metals and metal ions
DE4229662A1 (en) * 1992-09-04 1994-03-17 Steag Ag Process for removing heavy metals, in particular mercury, from waste water from flue gas scrubbers
JPH09136072A (en) * 1995-11-10 1997-05-27 Jgc Corp Fly ash treatment method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053401A (en) * 1974-11-29 1977-10-11 Nichireki Chemical Inudstry Co., Ltd Sludge treating process
US5007965A (en) * 1989-05-31 1991-04-16 Kansai Engineering Co., Ltd. Material for treating heavy metals and metal ions
DE4229662A1 (en) * 1992-09-04 1994-03-17 Steag Ag Process for removing heavy metals, in particular mercury, from waste water from flue gas scrubbers
JPH09136072A (en) * 1995-11-10 1997-05-27 Jgc Corp Fly ash treatment method

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