CN101885572B - Environment-friendly eluting agent for treating heavy metal contaminated soil and sludge - Google Patents
Environment-friendly eluting agent for treating heavy metal contaminated soil and sludge Download PDFInfo
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- CN101885572B CN101885572B CN2010102169251A CN201010216925A CN101885572B CN 101885572 B CN101885572 B CN 101885572B CN 2010102169251 A CN2010102169251 A CN 2010102169251A CN 201010216925 A CN201010216925 A CN 201010216925A CN 101885572 B CN101885572 B CN 101885572B
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Abstract
The invention relates to an environment-friendly eluent for treating heavy metal contaminated soil and sludge, which is characterized by comprising the following process steps in parts by weight: stirring 15-20 parts of gluconic acid, 12-17 parts of sodium chloride, 0.3-1 part of sodium dodecyl sulfate, 2-2.7 parts of sodium carboxymethyl cellulose and 965-970 parts of water in a mixing kettle at 45-55 ℃, wherein the stirring speed is 180-200 revolutions per minute, and the stirring time is 30-60 minutes. The invention has the advantages that: the gluconic acid can play a good role in desorbing most heavy metals in the soil, so that the heavy metals are separated from the soil and enter a liquid phase; the gluconic acid is an environment-friendly substance, and does not cause secondary pollution to the environment; the sodium dodecyl sulfate can improve the surface tension of the solution and improve the complexing effect of the eluent; the sodium carboxymethyl cellulose can capture heavy metal ions in the leacheate, and the heavy metals can be combined with the sodium carboxymethyl cellulose to destroy the micelle form of the sodium carboxymethyl cellulose, so that the effect of heavy metal enrichment is achieved; simple operation, low cost and wide application.
Description
Technical field
The present invention relates to a kind of environmentally-friendly eluent that is used to handle heavy-metal contaminated soil and mud, belong to the reparation field of heavy-metal contaminated soil and mud.
Background technology
Heavy metal is widely used in modern industry, generally is used for plating, printing and dyeing and catalysis industry etc.But in a single day imappropriate to its management and disposal, can cause serious environmental to pollute and social effects of pollution.Heavy metal pollution has generality, irreversibility and enriching, is described as " Chemical Time Bomb " in the present age.Heavy metal is the energy stable existence in environment, can not be decomposed, and is difficult to be reduced.Some can be combined into the organic heavy metal compound with organic matter, by plant is absorbed, and some water that permeates the ground, and then enter food chain, high multiple enrichment causes serious harm to human body in human body.
At present, the main methods to heavy-metal contaminated soil and high content of beary metal mud has:
One, engineering control.Comprise soil removal and replacement, curing, electrodynamics method etc.
Two, chemical harnessing.Comprise chemical extraction (drip washing, extraction), use modifying agent etc.
Three, biological treating.Comprise microorganism absorption, plant absorption etc.
Contrast above the whole bag of tricks quality, elution method is to the soil of heavy metal pollution and direct, the most effective processing method of mud.The composition of eluent is the core of elution method, and reason is that the basis of elution method promptly utilizes active ingredient and group in the eluent heavy metal in soil and the mud to be played effects such as desorb, complexing, makes it break away from former earth carrier.The eluent that adopts in scientific research now and the practice mainly is divided into four big classes: inorganic eluent, artificial chelating agent, natural organic acids and biosurfactant.
Inorganic eluent is representative with hydrochloric acid, is aided with some chloride salts.Because the highly acid of hydrochloric acid, in the wash-out heavy metal, also the physicochemical property and the microaggregate structure of soil wracked, the soil after the drip washing does not have value, can't be generalized to large-scale application.
Artificial chelating agent is representative with EDTA (ethylenediamine tetra-acetic acid), and the effect of wash-out heavy metal is also very good, and reason is that the ability of EDTA complexation of metal ions is very strong, and the complex compound of formation is highly stable.But EDTA and most of artificial chelating agent itself are poisonous, can enter the ecological circulation system as the eluent main component, cause secondary pollution.
Biosurfactant is the class active material that biological metabolism produces, and has degradability and ultralow surface tension, relies on ultralow surface tension, heavy metal decomplexing from the soil colloid can be got off to enter the solution phase.But not all biosurfactant all has the ability of drip washing heavy-metal contaminated soil, and too late inorganic acid of its absorbability to heavy metal and artificial chelating agent.
Natural organic acids is representative with the citric acid, and it handles the principle and the effect of heavy metal and manually chelating agent is similar, but has advantages such as hypotoxicity, degradability, is more suitable for the processing in heavy-metal contaminated soil.
Select suitable eluent that the liquid waste processing that heavy-metal contaminated soil carries out after the drip washing is had crucial meaning equally, discrete heavy metal needs enrichment, can eliminate the harm of heavy metal, also can create economic worth.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of environmentally-friendly eluent that is used to handle heavy-metal contaminated soil and mud is provided, can the wash-out heavy metal, environment and water body are not damaged again, simultaneously can also enriching heavy metal.
According to technical scheme provided by the invention, described environmentally-friendly eluent is counted by weight, comprises following component: 15～20 parts gluconic acid, 12～17 parts sodium chloride, 0.3～1 part dodecyl sodium sulfate, 2～2.7 parts sodium carboxymethylcellulose and 965～970 parts water.
The method of environmentally-friendly eluent that preparation is used for handling heavy-metal contaminated soil and mud is as follows: the water of 15～20 parts gluconic acids, 12～17 parts sodium chloride, 0.3～1 part dodecyl sodium sulfate, 2～2.7 parts sodium carboxymethylcellulose and 965～970 parts mixing kettle at 45～55 ℃ is stirred, mixing speed is 180～200 rev/mins, and mixing time is 30～60 minutes; Unit is a weight portion.
Advantage of the present invention:
1, gluconic acid can play good desorption to most of heavy metal in the soil, makes it to separate with soil, enters liquid phase;
2, gluconic acid is the environment-friendly type material, and excessive inorganic agent can not cause secondary pollution to environment;
3, dodecyl sodium sulfate can improve solution surface tension, improves the complexing effect of eluent;
4, sodium carboxymethylcellulose can be caught the heavy metal ion in the leacheate, and heavy metal can combine with sodium carboxymethylcellulose, destroys its micelle form, reaches the effect of heavy metal accumulation;
5, simple to operate, with low cost, widely applicable.
The specific embodiment
The invention will be further described below in conjunction with specific embodiment.
Employed mixing kettle is the multi-functional dispersed with stirring mixing kettle of FS type that source, Jiangyin City grand machine-building Co., Ltd makes among the present invention;
Used gluconic acid can adopt the Shanghai reputation to beautify the gluconic acid that worker Co., Ltd produces among the present invention, and gluconic acid forms complex compound as heavy metal complexing agent with heavy metal ion.Gluconic acid turns to the equilibrium mixture of gamma glucose acid lactone and δ-glucolactone in Transfer in Aqueous Solution.The mixture that consists of gluconic acid, two kinds of lactones and gluconic acid sodium salt of whole solution.Being formed with of lactone helps capillary reduction, and then helps the some absorption of molecule on soil, and the heavy metal ion decomplexing on the soil is got off.A part of hydrogen ion that the ionization of free gluconic acid institute goes out can play the effect of acidolysis to the heavy metal in soil sediment.The gluconic acid radical ion can play the stable effect of complexing;
Sodium chloride used among the present invention is as ion-exchanger, Na
+Energy and heavy metal ion generation ion-exchange with heavy metal ion generation ion-exchange in the mud, displace the heavy metal ion in the mud;
Used dodecyl sodium sulfate can adopt the dodecyl sodium sulfate that Guanghua Science ﹠ Technology Co., Ltd., Shanghai produces among the present invention, dodecyl sodium sulfate is as surfactant, be used to reduce Sludge Surface tension force, prevent mud caking, help fully contacting of heavy metal species and complexing agent in the dirt;
Used sodium carboxymethylcellulose can adopt the sodium carboxymethylcellulose that the happy chemical industry of prestige (Suzhou) Co., Ltd produces among the present invention, sodium carboxymethylcellulose is as heavy metal chelating agent, sodium carboxymethylcellulose exists with micelle form in the aqueous solution, glue speed is met heavy metal ion and is promptly formed reunion, under non-high concentration heavy metal condition, the floating liquid level of going up of this reunion is convenient to collect, sort out.
Embodiment one: a kind of environmentally-friendly eluent that is used to handle heavy-metal contaminated soil and mud, and its component is counted by weight, comprises following processing step:
15 parts gluconic acids, 12 parts sodium chloride, 0.3 part dodecyl sodium sulfate, 2 parts sodium carboxymethylcellulose and 965 parts water are stirred in 45 ℃ mixing kettle, and mixing speed is 180 rev/mins, and mixing time is 60 minutes.
Plumbous, cadmium is typical heavy metal contaminants, can produce very big harm to environment.Delivery intends polluting soil sample 10 grams, and lead content is 1048ppm, and cadmium content is 95ppm, adds 200mL eluent solution, stirs 1h.Suction filtration, lead content is kept to 125ppm in the testing result show sample, and cadmium content is kept to 3ppm, and eluting rate all is higher than 88%.
Embodiment two: a kind of environmentally-friendly eluent that is used to handle heavy-metal contaminated soil and mud, and its component is counted by weight, comprises following processing step:
20 parts gluconic acids, 17 parts sodium chloride, 1 part dodecyl sodium sulfate, 2.7 parts sodium carboxymethylcellulose and 970 parts water are stirred in 55 ℃ mixing kettle, and mixing speed is 200 rev/mins, and mixing time is 30 minutes.
Add the 50kg contaminated soil in the reactor of 500L, lead content is 1048ppm, and cadmium content is 95ppm, adds 200L eluent solution, stirs 1h.Get the mud sample after the filtration and detect after drying, the result shows that wherein lead content is 188ppm, and cadmium content is 8ppm, and eluting rate all is higher than 80%.
Embodiment three: a kind of environmentally-friendly eluent that is used to handle heavy-metal contaminated soil and mud, and its component is counted by weight, comprises following processing step:
18 parts gluconic acids, 15 parts sodium chloride, 0.6 part dodecyl sodium sulfate, 2.4 parts sodium carboxymethylcellulose and 968 parts water are stirred in 50 ℃ mixing kettle, and mixing speed is 190 rev/mins, and mixing time is 45 minutes.
Sampling detects in 50,000 cubes of mud mummifying pools, wherein lead content is 1189ppm, and cadmium content is 37ppm, and it is flocculant that polyacrylamide is selected in the mud mummification for use, eluent and flocculant are squeezed into simultaneously, and it is 0.034mol/L that sample analysis gets gluconic acid radical ion concentration.Flocculation the time is carried out removing of heavy metal, and solution flows to cistern from ventilating water pipe, the enrichment of carrying out heavy metal with separate.Mummification mud sample analysis, lead content is kept to 35ppm, cadmium content detected less than.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102976577A (en) * | 2012-12-17 | 2013-03-20 | 武汉理工大学 | Composite eluting agent for removing metal in precipitated sludge |
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| CN103752599A (en) * | 2013-12-25 | 2014-04-30 | 天津生态城环保有限公司 | Equipment and method for restoring heavy metal contaminated soil by combining leaching and electro-deposition |
| CN104043642A (en) * | 2014-06-25 | 2014-09-17 | 柏连阳 | Method for in-situ separation of harmful heavy metal in soil |
| CN104925881B (en) * | 2015-06-22 | 2016-09-14 | 缪琼华 | A kind of remove the water treatment agent of phenolic compound in water |
| CN104891622A (en) * | 2015-06-22 | 2015-09-09 | 缪琼华 | Complexing agent for removing phenolic compounds in water |
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| CN105417667B (en) * | 2015-11-13 | 2018-06-05 | 广东省环境科学研究院 | A kind of Compositional type heavy metal chelating agent and preparation method thereof |
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| CN105921505B (en) * | 2016-06-21 | 2019-05-10 | 湖南科臣环境科技有限公司 | A method of repairing cadmium arsenical copper heavy-metal contaminated soil |
| CN108284126B (en) * | 2018-03-10 | 2021-03-09 | 通化鑫鸿新材料有限公司 | A kind of purification and restoration agent for polluted soil and purification and restoration treatment method |
| CN111662724A (en) * | 2020-06-12 | 2020-09-15 | 广州润方环保科技有限公司 | Heavy metal contaminated soil eluting agent and preparation method and application thereof |
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| US7547781B2 (en) * | 2006-09-11 | 2009-06-16 | Curis, Inc. | Quinazoline based EGFR inhibitors containing a zinc binding moiety |
| CN100417630C (en) * | 2006-12-05 | 2008-09-10 | 天津师范大学 | A leaching method for removing heavy metals and repairing domestic waste composting |
| CN101224467A (en) * | 2008-01-04 | 2008-07-23 | 南京大学 | Leaching agent and method for remediating soil polycyclic aromatic hydrocarbons-copper complex pollution |
| CN101293254B (en) * | 2008-05-27 | 2011-04-20 | 南京大学 | Method for eluting and renovating soil with heavy metal-organic matter combined pollution |
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| CN102976577A (en) * | 2012-12-17 | 2013-03-20 | 武汉理工大学 | Composite eluting agent for removing metal in precipitated sludge |
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