CN103436265B - A kind of contaminated soil, bed mud and mud deoxidization, degradation stablizer and preparation method thereof and using method - Google Patents
A kind of contaminated soil, bed mud and mud deoxidization, degradation stablizer and preparation method thereof and using method Download PDFInfo
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Abstract
Soil reduction process degradation property stablizer that the present invention relates to a heavy metal species and/or Organic pollutants and its production and use, described deoxidization, degradation stablizer is by the synergy of plurality of active ingredients, can the heavy metal in contaminated soil and organism be realized fast, stabilization efficiently, and organic content can be reduced further, thus realize the object reducing pollutent Leaching and health risk, a kind of novel, efficient new stabilizer, there is process substrate wide in range, total amount of organic can be cut down, stabilising effect is good, the plurality of advantages such as easy to operate, at contaminated soil, bed mud, the improvement fields such as mud have broad application prospects.
Description
Technical field
The present invention relates to stablizer of contaminated soil, bed mud and mud and preparation method thereof and using method, particularly a kind of contaminated soil, bed mud and mud deoxidization, degradation stablizer and preparation method thereof and using method, belong to environmental improvement and protection field.
Background technology
China smelts at long-term mining and accumulates in course of industrialization and defines comparatively serious heavy metal and Organic pollutants, along with the quickening of industry restructuring and the quick propelling of urbanization process, the contaminated site left over after the resettlement of a large amount of industrial enterprises comes out, serious threat is caused to environment and HUMAN HEALTH, needed badly before social need-oriented and administer and repair.
On the other hand, the heavy metal in contaminated river, lake and organism finally enter in settling through long term physical chemical process and bioprocess, and these bed muds are faced with and deal carefully with handling problems after dredging.
Again on the one hand, industrial enterprise can produce a large amount of containing heavy metal and organic mud in process of production, and the final product of municipal sewage plant's sewage disposal is also containing plurality of heavy metal and organism, the wet mud that China produces every year is more than 100,000,000 tons, and the safe handling of these Contaminated Sewage Sludges is that following resource utilizes restraining factors.
In sum; these contain heavy metal and organic soil, bed mud and mud; all be faced with the active demand how carrying out safe handling; carrying out safety to them, quick, process is efficiently current environmental improvement and one of emphasis problem and research topic in protection field, is also the hot subject at present in this field.
From the angle reducing pollutent health risk, stable curing technology is the comparatively ripe and cost-effective technology of one, applies very extensive abroad, is heavy-metal contaminated soil, solid waste treatment field uses technology at most the most widely.
In recent years, domesticly also bring into use this technology, but the solidifying agent that this technology uses mainly adopts the hydraulic materials such as cement, lime, gypsum, often make soil or other solid waste produce the problems such as sclerosis, increase-volume, be unfavorable for follow-up disposal and utilization.
Compared with curing technology, the physical behavior of stablizer to soil, bed mud, mud etc. does not have significant change, but heavy metal and organism can be fixed up by effects such as absorption, precipitations, reach and reduce the Leaching of pollutent and the object of health risk.
Stablizer conventional at present can be divided into clay mineral, Rock Phosphate (72Min BPL), iron and manganese oxides, silicon class material, organic sequestering agent etc., mainly through changing the existing forms of heavy metal in soil, making it change stable state into by activated state, thus reducing its toxic action; Or organism is adsorbed stable by its adsorption.
CN1187139C discloses a kind for the treatment of process of commercial metal solid waste, described method employs novel concrete solidification matrix, its composition and ratio is: city garbage burning flying ash 70-90 % by weight, aluminum-containing additive 3-10 % by weight, calcareous control agent 7-20 % by weight, this solidification matrix is mixed with industrial heavy metal solid slag or mud, stir after adding water, just plasticly obtain cement block stone cured body, after normal temperature maintenance, imbed landfill yard.
CN1630941A discloses a kind of macromolecular heavy metal chelating agent of stabilization of dangerous waste materials, and described sequestrant is formed basic framework with polyamines or polymine, with the dithiocarbonic anhydride liquid of Reactive Synthesis or its crystallisate in the basic conditions.
CN101642612A discloses a kind of sequestrant of stabilizing heavy metal, the effective constituent of described sequestrant is cyclic polyamines compounds, comprise two piperidines or amino-ethyl piperazidine, it can form the complex compound of stable chemical nature with heavy metal, can process the refuse containing heavy metal or waste liquid.
CN102101123B discloses a kind of heavy-metal contaminated soil restorative procedure, described method is the use of heavy-metal contaminated soil and repairs medicament, and described medicament is by submicron or Nanoscale Iron, flyash, is obtained by mixing according to the part by weight of 5-25:40-50:1-10:15-50 containing magnesium preparation and boron-moisten soil.After this reparation chemicals treatment, the requirement of China " standard of soil environment quality " (GB15618-1995) secondary standard value can be met.
CN102357518A discloses a kind of chemical stabilization compound drug reducing heavy metal-polluted soil leaching concentration, and described medicament comprises 5-10 weight part calcium hydroxide, 2-5 weight parts of fine coal ash and 0.1-2 parts by weight sodium carbonate, just obtains through mixing.
CN102380505B discloses a kind of method using nano zero valence iron process heavy-metal contaminated soil or mud, soil or mud is fully mixed with Zero-valent Iron, then adopts magnet to be separated by the nano zero valence iron containing heavy metal, thus is removed heavy metal.
A kind of stablizer of heavy-metal contaminated soil is disclosed in CN102343357B, described stablizer comprises heavy metal chelant, gelling material, clay mineral and alkali-activator, uses the heavy metal contaminants in rear Absorbable organic halogens soil and the toxicity of contaminant reducing.
CN102389776A discloses a kind of heavy metal absorbent, described sorbent material is for carrier with the inorganic mineral through tensio-active agent process, load organic complexing agent is prepared from, described inorganic mineral is wilkinite, kaolin, diatomite, zeolite, aluminum oxide or ferriferous oxide, described tensio-active agent is cationic surfactant or nonionic surface active agent, and described organic complex is containing sulfydryl or containing amino compound.
CN102732259A discloses a kind of heavy metal contamination crystallization encapsulating stablizer, and described stablizer comprises phosphoric acid salt or vitriol 15-25 % by weight, heavy metal chelant 1-5 % by weight, gelling material 20-40 % by weight, clay mineral 30-60 % by weight.
CN102921142A discloses a kind of heavy metal contaminants immobilized reagent composition, and described immobilized reagent comprises the metal chelator of the phosphoric acid salt of 5-70 % by weight, the metallic sulfide of 1-60 % by weight, the metal oxide of 5-80 % by weight, the strong base weak acid salt compound of 5-65 % by weight, the metal(lic)stabilizer of 0.1-15 % by weight and 0.1-10 % by weight.
CN102965116A discloses a kind of heavy metal stabilizer, and described stablizer comprises phosphoric acid salt, the wilkinite of 20-25 % by weight, the fluorapatite of 25-30 % by weight, the sodium chloride/potassium chloride of 4-6 % by weight of 40-50 % by weight.
CN102965119A discloses a kind of heavy metal stabilizer, described stablizer take polymine as skeleton, magnesium compound is conditioning agent, and being aided with Tetramethylammonium hydroxide is carbon-dioxide absorbent, and is equipped with molysite, synthesis high-molecular chelating agent and magnesiumcarbonate microcrystal mixture.
As mentioned above, although disclose the multiple heavy metal stabilizer for contaminated soil in prior art, also different effects is achieved, but the handling object of these stablizers is all the heavy metal in soil, bed mud or mud, and the stablizer of the heavy metal be applied in these media and organism and their combined pollution still lacks.
In these stabilization technologies, although reduce the Leaching of pollutent from risk angle, but the total amount of pollutant that can not change in soil, bed mud or mud, this contradicts with standard of soil environment quality, therefore, exploitation heavy metal has reductibility and stablizes and organism had to the stablizer of degradation property stabilization, realizes the object reducing stablizer adding proportion and cut down total amount of organic, be the cutting edge technology in this field, there is great application prospect and promotional value.
Therefore, research and development can realize heavy metal and the stable stablizer of organism simultaneously, especially that heavy metal is more efficiently stable and by realizing new stabilizer and the method for degraded while organism stabilization, have urgent demand.
Summary of the invention
Specifically, the present invention relates to three aspects.
First aspect, the invention provides a kind of contaminated soil, bed mud and mud deoxidization, degradation stablizer, described deoxidization, degradation stablizer can realize reductibility stabilization to the heavy metal in soil, bed mud, mud, obtaining, the adding proportion under same stable effect is lower, thus achieve the increase-volume of minimum degree, substantially do not increase the scale of construction of follow-up disposal; In addition, stablizer of the present invention also can realize stabilization to the organic pollutant in soil, bed mud or mud, and can realize degraded to chloro wherein, bromo organism.After stabilizer treatment soil of the present invention, bed mud and mud, heavy metal and organic Leaching significantly reduce, and achieve organic part decrement, and the solid dielectric scale of construction increases less, facilitates subsequent disposal and utilization.
Described deoxidization, degradation stablizer of the present invention, in mass fraction, comprising is the following component of following mass fraction separately:
In described deoxidization, degradation stablizer of the present invention, the implication of described clay mineral is the simple clay mineral of any material of non-load, its mass fraction is 20-50 part, and this scope includes any concrete point value wherein, as 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described loading type clay mineral is 10-40 part, and this scope includes any concrete point value wherein, as 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or 40 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described molecular sieve ore is 10-15 part, and this scope includes any concrete point value wherein, as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described phosphatic rock is 5-10 part, and this scope includes any concrete point value wherein, as 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described ferriferous oxide is 3-10 part, and this scope includes any concrete point value wherein, as 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described gelatinous material is 5-10 part, and this scope includes any concrete point value wherein, as 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described activator is 2-8 part, and this scope includes any concrete point value wherein, as 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described deoxidization, degradation agent is 5-20 part, and this scope includes any concrete point value wherein, as 5 parts, 8 parts, 11 parts, 14 parts, 17 parts or 20 parts.
In described deoxidization, degradation stablizer of the present invention, the mass fraction of described auxiliary material is 1-6 part, and this scope includes any concrete point value wherein, as 1 part, 2 parts, 3 parts, 4 parts, 5 parts or 6 parts.
In described deoxidization, degradation stablizer of the present invention, described clay mineral is any one or any several arbitrary combination of sepiolite, kaolin, illite, polynite, attapulgite.
In described deoxidization, degradation stablizer of the present invention, described loading type clay mineral is any one or any several arbitrary combination in the above-mentioned clay mineral of load nano zero valence iron.
In described deoxidization, degradation stablizer of the present invention, described molecular sieve ore is the combination of any one or two kinds of of zeolite or vermiculite.
In described deoxidization, degradation stablizer of the present invention, described phosphatic rock is a kind of or any several arbitrary combination in asparagus stone, fluorapatite, wlkeite, chlorapatite, saamite.
In described deoxidization, degradation stablizer of the present invention, described ferriferous oxide is a kind of or any several arbitrary combination in pyrrhosiderite, rhombohedral iron ore, lepidocrocite and hydrous iron oxide.
In described deoxidization, degradation stablizer of the present invention, described gelatinous material is any one or any several arbitrary combination of Calucium Silicate powder, ca aluminosilicate, calcium aluminoferrite.
In described deoxidization, degradation stablizer of the present invention, described activator is the arbitrary combination of any one or two kinds in calcium sulfate and sodium sulfate.
In described deoxidization, degradation stablizer of the present invention, described deoxidization, degradation agent is one or both arbitrary combination in ferrous salt and zeroth order iron powder.Described ferrous salt is preferably ferrous sulfate or iron protochloride.When processing heavy-metal contaminated soil, described deoxidization, degradation agent is preferably ferrous salt; When processing organic material contaminated soil, then described deoxidization, degradation agent is preferably zeroth order iron powder; When the soil processed is simultaneously by heavy metal and Organic pollutants, then described deoxidization, degradation agent is preferably ferrous salt and zeroth order iron powder.But it should be noted, when processing contaminated soil, more preferably ferrous salt is used alone.
In described deoxidization, degradation stablizer of the present invention, described auxiliary material is a kind of or any several arbitrary combination in float stone, blast furnace slag, volcanic ash, flyash.
Second aspect, the present invention relates to the preparation method of described deoxidization, degradation stablizer.
Described preparation method be in following method A-C any one:
Method A: when described deoxidization, degradation agent is only zeroth order iron powder, clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, activator, zeroth order nanometer iron powder and auxiliary material are mixed together grinding evenly, cross 200 mesh sieves.
Method B: when described deoxidization, degradation agent is only ferrous salt, is mixed together grinding evenly, crosses 200 mesh sieves by clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, activator and auxiliary material; And ferrous salt is mixed with the aqueous solution that mass concentration is 10-40%.
Method C: when described deoxidization, degradation agent be zeroth order iron powder and ferrous salt time, clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, activator, zeroth order iron powder and auxiliary material are mixed together grinding evenly, cross 200 mesh sieves; And ferrous salt is mixed with the aqueous solution that mass concentration is 10-40%.
In described deoxidization, degradation stablizer of the present invention and preparation method thereof, the preparation method of described loading type clay mineral is as follows:
Clay mineral acid solution is soaked, then with deionized water rinsing to neutral, dries; Again with Fe
3+solution repeatedly infiltrates, and makes its cation exchange capacity (CEC) (CEC) all by Fe
3+saturated; After washing away particle-removing surface non-electrostatic ADSORPTION STATE excess ions with deionized water, use NaBH
4reductive agent is by Fe
3+be reduced to Zero-valent Iron, obtained described Nanoscale Iron loading type clay mineral.
The third aspect, the present invention relates to and use described deoxidization, degradation stablizer to carry out the treatment process that deoxidization, degradation stablizes contaminated soil, bed mud and mud.Described deoxidization, degradation stablizer can be used to process by the soil of heavy metal and/or Organic pollutants, bed mud or mud, the described deoxidization, degradation stablizer of the application of the invention, through the choose reasonable of each component concentration and the use of unique processing method and processing parameter, can by wherein heavy metal and/or organism more effectively stabilization, and the organic content of Partial digestion, compared with common stabilization technology, addition is lower, and has the function of organism decrement.
Specifically, a third aspect of the present invention relates to:
I. use described deoxidization, degradation stablizer to carry out the treatment process of deoxidization, degradation stabilizing heavy metal contaminated soil, bed mud or mud, the treating method comprises following steps:
(1) heavy-metal contaminated soil, bed mud or mud are carried out crushing and screening, then spraying mass concentration is the ferrous salt solution of 10-40%, and the sprinkling quality of described ferrous salt solution is the 10-30% of soil, bed mud or sludge quality, and stirring and evenly mixing;
(2) by clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, auxiliary material, activator through ground and mixed, the mixing material crossed after 200 mesh sieves adds in the heavy-metal contaminated soil of step (1) gained, bed mud or mud, and mix, add the 3-15% that quality is soil, bed mud or sludge quality before not spraying ferrous salt solution;
(3) Leaching Heavy Metals of heavy-metal contaminated soil, bed mud or mud in monitoring step (2) and/or content.
II. use described deoxidization, degradation stablizer to carry out the treatment process of deoxidization, degradation stable organic matter contaminated soil, bed mud or mud, the treating method comprises following steps:
(1) organic material contaminated soil, bed mud or mud are carried out crushing and screening;
(2) by clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, auxiliary material, activator, zeroth order iron powder through mixed grinding, the mixing material crossed after 200 mesh sieves adds in the organic material contaminated soil of step (1) gained, bed mud or mud, and mix, interpolation quality is the 3-15% of soil, bed mud or sludge quality;
(3) Leaching Heavy Metals of heavy-metal contaminated soil, bed mud or mud in monitoring step (2) and/or content.
III. use described deoxidization, degradation stablizer to carry out deoxidization, degradation to stablize simultaneously by the treatment process of the soil of heavy metal and Organic pollutants, bed mud or mud, the treating method comprises following steps:
(1) contaminated soil, bed mud or mud are carried out sieving approach, then spraying mass concentration is the ferrous salt solution of 10-40%, and the sprinkling quality of described ferrous salt solution is the 10-30% of soil, bed mud or sludge quality, and stirring and evenly mixing;
(2) by clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, auxiliary material, activator, zeroth order iron powder through mixed grinding, the mixing material crossed after 200 mesh sieves adds in the heavy-metal contaminated soil of step (1) gained, bed mud or mud, and mix, add the 3-15% that quality is soil, bed mud or sludge quality before not spraying ferrous salt solution;
(3) heavy metal in detecting step (2) and the heavy metal of organic material contaminated soil, bed mud or mud and organism Leaching and/or content.
Positively effect of the present invention is:
(1) stabilization can be carried out to the heavy metal in soil, bed mud or mud or organism or their combined pollutant simultaneously.This stablizer is by the rational proportion of different inorganic materials, and not only heavy metal has excellent stabilization effect, and also has good stabilization effect to organism.
(2) not only there is static stabilization to the organic pollutant in soil, bed mud or mud, and As time goes on, can realize halo, the organic Degradation of bromo, cut down total amount of organic; To the heavy metal in solid dielectric, have strengthening reduction stabilization, stabilization speed is fast, effective.
(3) dosage is little, and stabilization effect is good.This stablizer is by the reasonable combination of different natural materials and exotic materials, give full play to the synergy of the materializing procedures such as the absorption of these materials, precipitation, co-precipitation, reduction, replacement, reduce the dosage of stablizer, significantly enhance the long term stabilization effect to pollutent, reduce the Leaching of contaminated soil, biological effectiveness, ecological risk and human health risk.
(4) material adopted is cheap and easy to get, and can not produce secondary pollution, engineering construction is convenient, is one deoxidization, degradation stablizer fast and efficiently.
Embodiment
Below by specific embodiment, the present invention is described in detail; but the purposes of these exemplary embodiments and object are only used for exemplifying the present invention; not any type of any restriction is formed to real protection scope of the present invention, more non-protection scope of the present invention is confined to this.
Preparation example 1: the preparation of loading type clay mineral
The aqueous hydrochloric acid of sepiolite 1mol/L is soaked, then with deionized water rinsing to neutral, dries; Again with the FeCl of 1mol/L
3solution impregnation, makes its cation exchange capacity (CEC) (CEC) all by Fe
3+saturated; After washing away particle-removing surface non-electrostatic ADSORPTION STATE excess ions with deionized water, use NaBH
4reductive agent is by Fe
3+be reduced to Zero-valent Iron, obtained Nanoscale Iron loading type clay mineral, called after loading type clay mineral-1.
Preparation example 2-5: the preparation of loading type clay mineral
Except use kaolin, illite, polynite or attapulgite replace sepiolite, preparation example 2-5 is implemented respectively with the same way of preparation example 1, obtain the clay mineral that load has the kaolin of Nanoscale Iron, illite, polynite or attapulgite, and called after loading type clay mineral-2, loading type clay mineral-3, loading type clay mineral-4 and loading type clay mineral-5 respectively.
Embodiment 1
To the stabilization treatment of certain heavy-metal contaminated soil
The small-sized Electroplate Factory in Shanghai, the heavy metal in this place soil is mainly chromium, nickel, lead, and maximum concentration is respectively 841mg/kg, 2279mg/kg and 632mg/kg.After determining pollution range and the degree of depth after testing, usage mining machine is temporarily stored in side, place and is covered with on the plot of impervious material after being dug out by contaminated soil, screening crusher is adopted to carry out sieving approach to soil, reject bulk solid, spray mass concentration is the ferrous sulfate aqueous solution of 10% simultaneously, it is 10% of soil quality that the aqueous solution sprays quality, and stirs.
By mass parts, by 20 parts of sepiolites, 10 parts of loading type clay minerals-1,10 parts of zeolites, 5 parts of asparagus stones, 3 parts of pyrrhosiderites, 5 parts of Calucium Silicate powder, 1 part of float stone, 2 parts of calcium sulfate through mixed grinding, the mixing material crossed after 200 mesh sieves adds in above-mentioned soil, and mix, adding quality is 5% of the soil quality before not spraying ferrous sulfate aqueous solution, and adopts mixing machinery equipment to carry out stirring and evenly mixing to soil.
Maintenance, after seven days, detects Leaching Heavy Metals and the content of described heavy-metal contaminated soil.
Embodiment 2-5
Except working load type clay mineral-2, loading type clay mineral-3, loading type clay mineral-4 and loading type clay mineral-5 replace loading type clay mineral-1 respectively, implement embodiment 2-5 with the same way of embodiment 1 respectively.
Leaching Heavy Metals detection is carried out to the heavy-metal contaminated soil after embodiment 1-5 process, the results are shown in following table 1.
Table 1. is heavy metal-polluted soil leaching concentration (mg/L) after embodiment 1-5 process
ND: do not detect
From upper table 1, after process, the leaching concentration of heavy metal in soil is and does not detect, and meets the requirement of general industrial solid waste.
Embodiment 6
To the stabilization treatment of certain lake dredging bottom-mud heavy metal
The heavy metal that exceeds standard in the lake dredging bottom-mud of Shanghai is copper, lead and zinc, and peak concentration is respectively 1914mg/kg, 659mg/kg and 3125mg/kg.
After the abundant drying of this lake dredging bottom-mud, adopt screening crusher to carry out crushing and screening to soil, reject bulk solid, spray mass concentration is the ferrous sulfate aqueous solution of 15% simultaneously, and it is 20% of bed mud quality that the aqueous solution sprays quality, and stirs.
By mass parts, by 30 parts of kaolin, 20 parts of loading type clay minerals-1,15 parts of vermiculites, 10 parts of fluorapatites, 6 parts of rhombohedral iron ore, 10 parts of ca aluminosilicates, 4 parts of blast furnace slags, 5 parts of sodium sulfate through mixed grinding, the mixing material crossed after 200 mesh sieves adds to and has sprayed in the above-mentioned bed mud of ferrous sulfate aqueous solution, and mix, adding quality is 10% of the bed mud quality before not spraying ferrous sulfate aqueous solution, and adopts mixing machinery equipment to carry out stirring and evenly mixing to bed mud.
Maintenance, after 7 days, detects Leaching Heavy Metals and the content of described lake dredging bottom-mud.
Embodiment 7-10
Except working load type clay mineral-2, loading type clay mineral-3, loading type clay mineral-4 and loading type clay mineral-5 replace loading type clay mineral-1 respectively, implement embodiment 7-10 with the same way of embodiment 6 respectively.
Adopt national standard " solid waste Leaching leaching method horizontal vibration method " GB5086.2-1997, toxicity characteristic leaching procedure is carried out to the lake dredging bottom-mud after embodiment 6-10 process, does not all detect, the results are shown in following table 2.
Table 2. is heavy metal-polluted soil leaching concentration (mg/L) after embodiment 6-10 process
ND: do not detect
From upper table 2, after process, the leaching concentration of heavy metal in soil is and does not detect, and meets the requirement of general industrial solid waste.
Embodiment 11
To the stabilization treatment of certain Perchlorobenzene contaminated soil
Certain little insecticide factory site is polluted by Perchlorobenzene, and in contaminated soil, Perchlorobenzene maximum level is 18.3mg/kg.
After determining pollution range and the degree of depth after testing, usage mining machine is temporarily stored in side, place and is covered with on the plot of impervious material after being dug out by contaminated soil, adopts screening crusher to carry out crushing and screening to soil, rejects bulk solid.
By mass parts, by 40 parts of illites, 40 parts of loading type clay minerals-1,15 parts of zeolites, 8 parts of wlkeites, 5 parts of lepidocrocites, 7 parts of calcium aluminoferrites, 6 parts of volcanic ash, 8 parts of calcium sulfate, 8 parts of zeroth order iron powders through mixed grinding, the mixing material crossed after 200 mesh sieves adds in above-mentioned soil, and mix, adding quality is 15% of soil quality, and adopts mixing machinery equipment to carry out stirring and evenly mixing to soil.
After maintenance stablizes 28 days, sampling and measuring, the leaching concentration recording Perchlorobenzene is 0.2mg/L, far below the 5mg/L in Hazardous wastes standard of perfection.After 28 days, the hexachlorobenzene content measured in soil is 14.6mg/L, and total amount reduces 20%.Illustrate that stablizer of the present invention has the organic effect of degradating chloro.
Embodiment 11-15
Except working load type clay mineral-2, loading type clay mineral-3, loading type clay mineral-4 and loading type clay mineral-5 replace loading type clay mineral-1 respectively, implement embodiment 11-15 with the same way of embodiment 10 respectively.
After maintenance stablizes 28 days, sampling and measuring respectively, the Perchlorobenzene leaching concentration recording the soil of embodiment 11-15 process is 0.15-0.22mg/L, far below the 5mg/L in Hazardous wastes standard of perfection; The hexachlorobenzene content recorded in soil is 14.5mg/L to the maximum, and total amount reduces 21%.Illustrate that stablizer of the present invention has the organic effect of degradating chloro.
Embodiment 16
To the stabilization treatment of certain polycyclic aromatic hydrocarbon pollution
Certain contaminated site is polyaromatic hydrocarbon pollutant, and be mainly benzo (a) pyrene, benzo (b) fluoranthene, peak concentration is 5.2mg/kg and 6.1mg/kg.
After determining pollution range and the degree of depth after testing, usage mining machine is temporarily stored in side, place and is covered with on the plot of impervious material after being dug out by contaminated soil, adopts screening crusher to carry out crushing and screening to soil, rejects bulk solid.
By mass parts, by 25 parts of polynites and 25 parts of attapulgites, 15 parts of loading type clay minerals-1,10 parts of vermiculites, 5 parts of chlorapatites and 4 parts of strontium phosphorus ashes, 5 parts of hydrous iron oxides, 5 parts of ca aluminosilicates and 2 parts of calcium aluminoferrites, 2 parts of flyash, 2 parts of calcium sulfate and 2 parts of sodium sulfate, 15 parts of zeroth order iron powders through mixed grinding, the mixing material crossed after 200 mesh sieves adds in above-mentioned soil, and mix, adding quality is 5% of soil quality, and adopts mixing machinery equipment to carry out stirring and evenly mixing to soil.
After maintenance stablizes 28 days, sampling and measuring, the leaching concentration recording benzo (a) pyrene is 0.001mg/L, total amount is 4.4mg/kg, and the leaching of benzo (b) fluoranthene does not detect, this proves that described stablizer of the present invention has very excellent deoxidization, degradation stabilization to polycyclic aromatic hydrocarbons organic pollutant.
Embodiment 17-20
Except working load type clay mineral-2, loading type clay mineral-3, loading type clay mineral-4 and loading type clay mineral-5 replace loading type clay mineral-1 respectively, implement embodiment 17-20 with the same way of embodiment 16 respectively.
After maintenance stablizes 28 days, sampling and measuring respectively, benzo (a) the pyrene leaching concentration recording the soil of embodiment 17-20 process is 0.0008-0.0013mg/L, and the leaching of benzo (b) fluoranthene does not detect, this proves that described stablizer of the present invention has very excellent deoxidization, degradation stabilization to polycyclic aromatic hydrocarbons organic pollutant.
Should be appreciated that the purposes of these embodiments is only not intended to for illustration of the present invention limit the scope of the invention.In addition; also should understand; after having read technology contents of the present invention, those skilled in the art can make various change, amendment and/or modification to the present invention, and these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.
Claims (7)
1. use deoxidization, degradation stablizer to carry out the treatment process of deoxidization, degradation stabilizing heavy metal contaminated soil, bed mud or mud, described deoxidization, degradation stablizer is in mass fraction, and comprising is the following component of following mass fraction separately:
Wherein, the implication of described clay mineral is the simple clay mineral of any material of non-load;
It is characterized in that: the treating method comprises following steps:
(1) heavy-metal contaminated soil, bed mud or mud are carried out crushing and screening, then spraying mass concentration is the ferrous salt solution of 10-40%, and the sprinkling quality of described ferrous salt solution is the 10-30% of soil, bed mud or sludge quality, and stirring and evenly mixing;
(2) by clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, auxiliary material, activator through mixed grinding, the mixing material crossed after 200 mesh sieves adds in the heavy-metal contaminated soil of step (1) gained, bed mud or mud, and mix, add the 3-15% that quality is soil, bed mud or sludge quality before not spraying ferrous salt solution;
(3) heavy metal of heavy-metal contaminated soil, bed mud or mud in detecting step (2) and organism Leaching and/or content.
2. treatment process as claimed in claim 1, is characterized in that: described clay mineral is any one or any several arbitrary combination of sepiolite, kaolin, illite, polynite, attapulgite.
3. treatment process as claimed in claim 1 or 2, is characterized in that: described loading type clay mineral is any one or any several arbitrary combination in the described clay mineral of load nano zero valence iron.
4. treatment process as claimed in claim 1 or 2, is characterized in that: described gelatinous material is any one or any several arbitrary combination of Calucium Silicate powder, ca aluminosilicate, calcium aluminoferrite.
5. treatment process as claimed in claim 1 or 2, is characterized in that: described activator is the arbitrary combination of any one or two kinds in calcium sulfate and sodium sulfate.
6. treatment process as claimed in claim 1 or 2, is characterized in that: described deoxidization, degradation agent is one or both arbitrary combination in ferrous salt and zeroth order iron powder.
7. treatment process as claimed in claim 1 or 2, it is characterized in that: the preparation method of described deoxidization, degradation stablizer is as follows: clay mineral, loading type clay mineral, molecular sieve ore, phosphatic rock, ferriferous oxide, gelatinous material, activator and auxiliary material are mixed together grinding evenly, cross 200 mesh sieves; And ferrous salt is mixed with the aqueous solution that mass concentration is 10-40%.
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